Professor Megh Mallavarapu

Professor Megh Mallavarapu

Professor of Environmental Biotechnology

Global Centre for Environmental Remediation

Career Summary

Biography

Megh joined the University of Newcastle in May 2015. Prior to joining the University of Newcastle, Megh worked as Professor of Environmental Biotechnology (University of South Australia), Senior/Research Scientist (CSIRO Land & Water), Postdoctoral Fellow (GBF-National Research Centre for Biotechnology, Germany; University of Liverpool, UK; Otago University, New Zealand) and Research Scientist (Council of Scientific & Industrial Research, India).

Megh is an innovative researcher with a remarkably wide and in-depth knowledge of pollutant-microbe interactions in soil and bioremediation as reflected by his publications.  He is author/co-author of >300 refereed journal papers, 18 invited book chapters, 4 patents, several conference abstracts and co-editor of four books.  Most of Megh’s research has involved multidisciplinary teams for which he provided the leadership role. He has an ‘h’ index of 54 (i 10 index, 212) and total citations over 10,100.

Megh played a major role in demonstrating evidence in relation to the impact of microorganisms from environmental sources have upon drugs, their precursors, and manufacturing by-products. This study identified which chemicals associated with clandestine drug laboratories persist in the environment, in order to allow forensic drug chemists to link discarded residues with the method of manufacture, and to allow the environmental impact of clandestine drug laboratories to be assessed accurately. He demonstrated the role of soil algae/cyanobacteria in degradation/detoxification of several contaminants. Soil algae form an important component of soil microflora, but are generally neglected by microbiologists. Megh is one of the few scientists working in this important area of research involving soil algae. Megh and his colleagues have implemented natural attenuation at field scale as an effective remediation strategy for hydrocarbon impacted soils/groundwater sites. Also, Megh made significant contributions (microbiological expertise) to the field-scale remediation of TCE contaminated groundwater sites. Megh and colleagues have conducted research into the chemical characterisation of a new aqueous film forming foams (AFFF) products, developed a new analytical methods and demonstrated the fate and behaviour of these products in terms of their persistence and toxicity in soil, freshwater and marine environments. Research conducted by Megh and colleagues have demonstrated that certain dissolved organic matter-metal complexes and sorbed pesticides are bioavailable and this work has major implications for the toxicity, risk assessment and remediation of metals in soils.

Research Interests:

Megh’s current research interests include development of bioremediation technologies (TCE, PCBs, pesticides, petroleum hydrocarbons) and ecological risk assessment of both organic and inorganic contaminants with special reference to mix contamination, determination of fate and behaviour of both organic and inorganic pollutants including their bioavailability and toxicity in the environment. Spanning over 25 years, the research experience concerning the environmental pollutant – microorganism interactions includes:

  • Bioavailability and ecotoxicity of organic (pesticides, industrial chemicals) and inorganic (heavy metals and metalloids) contaminants including mix contamination
  • Development of sensitive, rapid toxicological methods (microbial) suitable for terrestrial toxicity testing and bioremediation efficacy evaluation
  • Isolation and characterisation of novel microorganisms (bacteria and algae) capable of detoxifying pollutants
  • Microbial degradation of pesticides, dioxin/dibenzofurans, PCBs, PAHs and petroleum hydrocarbons
  • Microbial transformation of heavy metal(loid)s (Arsenic, Chromium)
  • Bioremediation of TCE, PCBs and petroleum hydrocarbons in soils and groundwater
  • Development of cost effective bioremediation technologies (including natural attenuation, biosorption and phytoremediation/phytostabilisation).
  • Microbial Fuel cells
  • Mine site rehabilitation
  • Bionanotechnology/Fate and toxicity of nanoparticles in the environment
  • The role of terrestrial microalgae and cyanobacteria in pollutant degradation

Qualifications

  • PhD, Nagarjuna University - India
  • Master of Science, Nagarjuna University - India

Keywords

  • Bioavailability and Ecotoxicology
  • Bionanotechnology
  • Bioremediation
  • Ecological Risk Assessment
  • Environmental Microbiology
  • Heavy metals
  • Human health risk assessment
  • Land Use and Soil health
  • Microalgae
  • Mine site rehabilitation
  • Mixed contaminants
  • Perfluirinated chemicals (PFCs)
  • Pesticides
  • Petroleum Hydrocarbons
  • Phytoremediation
  • Polycyclic aromatic hydrocarbons (PAHs)

Languages

  • Telugu (Mother)
  • English (Fluent)

Fields of Research

Code Description Percentage
100203 Bioremediation 40
050303 Soil Biology 30
050205 Environmental Management 30

Professional Experience

UON Appointment

Title Organisation / Department
Professor of Environmental Biotechnology University of Newcastle
Global Centre for Environmental Remediation
Australia

Academic appointment

Dates Title Organisation / Department
1/10/2017 -  Editorial Board Member Ecotoxicology and Environmental safety Journal
United States
14/05/2015 -  Professor of Environmental Biotechnology The University of Newcastle
Global Centre for Environmental Remediation
Australia
1/01/2008 - 13/05/2015 Professor of Environmental Biotechnology University of South Australia
Centre for Environmental Risk assessment and Remediation
Australia
1/10/2005 - 31/12/2014 Associate Director The University of South Australia
Centre for Environmental Risk Assessment and Remediation
Australia
26/07/2005 - 30/06/2020 Program Leader, Remediation Technologies Program Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE)
Australia
21/01/2003 - 31/12/2007 Associate Professor The University of South Australia
Centre for Environmental Risk Assessment and Remediation
Australia
1/07/1998 - 20/01/2003 Senior Research Scientist CSIRO (Commonwealth Scientific and Industrial Research Organisation)
CSIRO Land & Water; Remediation of Contaminated Environments Program
Australia
Edit

Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Book (3 outputs)

Year Citation Altmetrics Link
2008 Singh N, Sethunathan N, Megharaj M, Naidu R, Chapter 5 Bioavailability of sorbed pesticides to bacteria: An overview (2008)
DOI 10.1016/S0166-2481(07)32005-9
Citations Scopus - 5
Co-authors Ravi Naidu
2008 Megharaj M, Naidu R, Chapter 11 Bioavailability and toxicity of contaminant mixtures to soil biota (2008)
DOI 10.1016/S0166-2481(07)32011-4
Citations Scopus - 2
Co-authors Ravi Naidu
2003 Kamaludeen SPB, Megharaj M, Juhasz AL, Sethunathan N, Naidu R, Chromium-microorganism interactions in soils: Remediation implications, SPRINGER, 72 (2003)
DOI 10.1007/0-387-21728-2_4
Citations Scopus - 78Web of Science - 62
Co-authors Ravi Naidu

Chapter (8 outputs)

Year Citation Altmetrics Link
2016 Wijayawardena A, Mallavarapu M, Naidu R, 'Exposure, toxicity, health impacts, and bioavailability of heavy metal mixtures', Advances in Agronomy, Elsevier, London 175-234 (2016) [B1]
DOI 10.1016/bs.agron.2016.03.002
Citations Scopus - 5Web of Science - 2
Co-authors Ayanka Wijayawardena, Ravi Naidu
2016 Kuppusamy S, Palanisami T, Megharaj M, Venkateswarlu K, Naidu R, 'Ex-situ remediation technologies for environmental pollutants: A critical perspective', Reviews of Environmental Contamination and Toxicology, Springer International, Cham, Switzerland 117-192 (2016) [B1]
DOI 10.1007/978-3-319-20013-2_2
Citations Scopus - 25Web of Science - 23
Co-authors Thava Palanisami, Ravi Naidu
2016 Kuppusamy S, Palanisami T, Megharaj M, Venkateswarlu K, Naidu R, 'In-situ remediation approaches for the management of contaminated sites: A comprehensive overview', Reviews of Environmental Contamination and Toxicology, Springer International, Cham, Switzerland 1-115 (2016) [B1]
DOI 10.1007/978-3-319-20013-2_1
Citations Scopus - 28Web of Science - 25
Co-authors Thava Palanisami, Ravi Naidu
2014 Chen ZX, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye¿crystal violet in aqueous solution', Nanotechnology for Sustainable Development, Springer, New York 189-196 (2014)
DOI 10.1007/978-3-319-05041-6_15
Co-authors Zuliang Chen, Ravi Naidu
2010 Caceres T, Megharaj M, Venkateswarlu K, Sethunathan N, Naidu R, 'Fenamiphos and Related Organophosphorus Pesticides: Environmental Fate and Toxicology', , SPRINGER 117-162 (2010)
DOI 10.1007/978-1-4419-5623-1_3
Citations Scopus - 18Web of Science - 16
Co-authors Ravi Naidu
2008 Naidu R, Semple KT, Megharaj M, Juhasz AL, Bolan NS, Gupta SK, et al., 'Chapter 3 Bioavailability: Definition, assessment and implications for risk assessment', 39-51 (2008)
DOI 10.1016/S0166-2481(07)32003-5
Citations Scopus - 17
Co-authors Nanthi Bolan, Ravi Naidu
2008 Naidu R, Bolan NS, Megharaj M, Juhasz AL, Gupta SK, Clothier BE, Schulin R, 'Chapter 1 Chemical bioavailability in terrestrial environments', 1-6 (2008)
DOI 10.1016/S0166-2481(07)32001-1
Citations Scopus - 11
Co-authors Nanthi Bolan, Ravi Naidu
2006 Bolan N, Mahimairaja S, Mallavarapu M, Naidu R, Adriano DC, 'Biotransformation of arsenic in soil and aquatic environments', Managing Arsenic in the Environment: From Soil to Human Health, CSIRO PUBLISHING, Australia 433-454 (2006)
Co-authors Ravi Naidu, Nanthi Bolan
Show 5 more chapters

Journal article (344 outputs)

Year Citation Altmetrics Link
2018 Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Impact of plant photosystems in the remediation of benzo[a]pyrene and pyrene spiked soils', Chemosphere, 193 625-634 (2018)

© 2017 Elsevier Ltd The phytoremediation potential of 14 different plant species belonging to C3 and C4 carbon fixation pathway for soils spiked with polycyclic aromatic hydrocar... [more]

© 2017 Elsevier Ltd The phytoremediation potential of 14 different plant species belonging to C3 and C4 carbon fixation pathway for soils spiked with polycyclic aromatic hydrocarbons (PAHs) such as benzo[a]pyrene (B[a] P) and pyrene (PYR) was investigated. A glasshouse experiment was conducted to measure the changes in morphological, physiological, biochemical parameters and the bioaccumulation and biodegradation ability of the plants in soils spiked with 48 and 194 mg kg -1 of B[a]P and PYR, respectively. The per cent removal efficacy of B[a] P and PYR by the tested plant species over a period of 50 days was from 6 to 26% and 14 to 40% respectively. The maximum removal of both B[a]P and PYR was observed in Sudan grass (C4), vetiver (C4), maize (C4), and sunflower (C3). In terms of accumulation in root and shoot, the concentration of PYR was higher in both C3 and C4 plant species when compared to B[a] P. Overall the results indicated that C4 plants were more efficient than their C3 counterparts in terms of morphological, physiological, biochemical and degradation ability of PAHs.

DOI 10.1016/j.chemosphere.2017.11.081
Co-authors Logeshwaran Panneerselvan
2018 Fang C, Zhang X, Dong Z, Wang L, Megharaj M, Naidu R, 'Smartphone app-based/portable sensor for the detection of fluoro-surfactant PFOA.', Chemosphere, 191 381-388 (2018) [C1]
DOI 10.1016/j.chemosphere.2017.10.057
Co-authors Morrow Dong, Liang Wang, Ravi Naidu, Cheng Fang
2017 Kuppusamy S, Thavamani P, Singh S, Naidu R, Megharaj M, 'Polycyclic aromatic hydrocarbons (PAHs) degradation potential, surfactant production, metal resistance and enzymatic activity of two novel cellulose-degrading bacteria isolated from koala faeces', ENVIRONMENTAL EARTH SCIENCES, 76 (2017) [C1]
DOI 10.1007/s12665-016-6337-3
Co-authors Ravi Naidu, Thava Palanisami
2017 Subashchandrabose SR, Wang L, Venkateswarlu K, Naidu R, Megharaj M, 'Interactive effects of PAHs and heavy metal mixtures on oxidative stress in Chlorella sp MM3 as determined by artificial neural network and genetic algorithm', ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 21 203-212 (2017) [C1]
DOI 10.1016/j.algal.2016.11.018
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Liang Wang, Suresh Subashchandrabose
2017 Mayilswami S, Krishnan K, Naidu R, Megharaj M, 'Transcriptome analysis of Eisenia fetida chronically exposed to benzo(a)pyrene', Environmental Technology & Innovation, 7 54-62 (2017) [C1]
DOI 10.1016/j.eti.2016.12.002
Co-authors Ravi Naidu, Kannan Krishnan
2017 Thavamani P, Samkumar RA, Satheesh V, Subashchandrabose SR, Ramadass K, Naidu R, et al., 'Microbes from mined sites: Harnessing their potential for reclamation of derelict mine sites', Environmental Pollution, 230 495-505 (2017) [C1]
DOI 10.1016/j.envpol.2017.06.056
Co-authors Suresh Subashchandrabose, Ravi Naidu, Thava Palanisami
2017 Kuppusamy S, Venkateswarlu K, Megharaj M, Mayilswami S, Lee YB, 'Risk-based remediation of polluted sites: A critical perspective', CHEMOSPHERE, 186 607-615 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.08.043
2017 Megharaj M, Naidu R, 'Soil and brownfield bioremediation', MICROBIAL BIOTECHNOLOGY, 10 1244-1249 (2017) [C1]
DOI 10.1111/1751-7915.12840
Co-authors Ravi Naidu
2017 Nirola R, Megharaj M, Subramanian A, Thavamani P, Ramadass K, Aryal R, Saint C, 'Analysis of chromium status in the revegetated flora of a tannery waste site and microcosm studies using earthworm E. fetida.', Environ Sci Pollut Res Int, (2017)
DOI 10.1007/s11356-017-0543-8
Co-authors Thava Palanisami
2017 Wang Z, Tian H, Lu G, Zhao Y, Yang R, Megharaj M, He W, 'Catalytic efficiency is a better predictor of arsenic toxicity to soil alkaline phosphatase.', Ecotoxicol Environ Saf, 148 721-728 (2017)
DOI 10.1016/j.ecoenv.2017.11.040
2017 Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Copper interactions on arsenic bioavailability and phytotoxicity in soil.', Ecotoxicol Environ Saf, 148 738-746 (2017)
DOI 10.1016/j.ecoenv.2017.11.025
Co-authors Dane Lamb, Liang Wang
2017 Ayanka Wijayawardena MA, Megharaj M, Naidu R, Stojanovski E, 'Chronic and reproductive toxicity of cadmium, zinc, and lead in binary and tertiary mixtures to the earthworm (Eisenia fetida)', Journal of Soils and Sediments, 1-8 (2017)

© 2017 Springer-Verlag GmbH Germany, part of Springer Nature Purpose: The presence of one metal can alter the toxicity of another metal by having an additive, synergistic, or ant... [more]

© 2017 Springer-Verlag GmbH Germany, part of Springer Nature Purpose: The presence of one metal can alter the toxicity of another metal by having an additive, synergistic, or antagonistic impact. Mixed metal pollution has clear ecological consequences. The importance of use of earthworms for ecological health monitoring is recognized widely. This study investigated the effect of binary and tertiary metal mixtures on the toxicity, bioaccumulation, and reproduction of the Eisenia fetida in different South Australian soils. Materials and methods: The end points used in this 56-day reproduction study were avoidance behavior, worm mortality, weight loss, reproduction, and metal (Cd, Zn, and Pb) bioaccumulation. The three soils (acidic, neutral, and alkaline) were spiked with selected binary and tertiary concentration mixtures that considered the soil quality guideline values, EC 50 and LC 50 values for Cd, Zn, and Pb obtained from the previous single metal earthworm experiments done by the authors. Results and discussion: In acidic soil, Zn and Cd constituted the most toxic metal combination to earthworms. However, in contrast to this observation, the same metal combination was the least toxic one to earthworms in neutral and alkaline soils. For Zn and Pb spiked soils, relationships between soil and internal metal concentrations were found with R 2 = 0.63, r = 0.8, and R 2 = 0.94, p < 0.01, respectively, for Zn and Pb. This study indicates that earthworms have high tendency to bioaccumulate heavy metals in their tissues and hence serves as ecological indicators of soil heavy metal contamination. The highest bioaccumulation factor (0¿9) was evident for Cd in contaminated soils. This study demonstrated the role of soil edaphic factors and metal-metal interactions in the toxicity of metal mixtures to E. fetida.Conclusions: In Zn and Pb binary mixture spiked acidic soil, mortality of 60% was recorded even when the Pb and Zn concentrations were below the Canada and Dutch EIL (ecological investigational levels) values. This indicates the current guideline values are not safe for mixed metal toxicity. Therefore, care must be taken when predicting metal toxicities in mixed metal contaminated soils.

DOI 10.1007/s11368-017-1877-z
Co-authors Ayanka Wijayawardena, Elizabeth Stojanovski
2017 Tian H, Kong L, Megharaj M, He W, 'Contribution of attendant anions on cadmium toxicity to soil enzymes', Chemosphere, 187 19-26 (2017) [C1]

© 2017 Elsevier Ltd Sorption and desorption are critical processes to control the mobility and biotoxicity of cadmium (Cd) in soils. It is known that attendant anion species of h... [more]

© 2017 Elsevier Ltd Sorption and desorption are critical processes to control the mobility and biotoxicity of cadmium (Cd) in soils. It is known that attendant anion species of heavy metals could affect metal adsorption on soils and might further alter their biotoxicity. However, for Cd, the influence of attendant anions on its sorption in soils and subsequent toxicity on soil enzymes are still unknown. In this work, four Cd compounds with different salt anions (SO 4 2- , NO 3 - , Cl - , and Ac - ) were selected to investigate their impact of on the sorption, soil dehydrogenase activity (DHA) and alkaline phosphatase activity (ALP). Thus, a series of simulated Cd pollution batch experiments including measuring adsorption-desorption behavior of Cd on soils and soil enzyme activities were carried out. Results showed that CdSO 4 exhibited highest sorption capacity among the tested soils except in Hunan soil. The Cd sorption with NO 3 - displayed a similar behavior with Cl - on all tested soils. Compared with soil properties, all four kinds of anions on Cd sorption played a more significant role affecting Cd ecological toxicity to soil DHA and ALP. Cd in acetate or nitrate form appears more sensitive towards DHA than sulphate and chloride, while the later pair is more toxic towards ALP than the former. These results have important implications for evaluation of Cd contamination using soil enzyme as bioindicator.

DOI 10.1016/j.chemosphere.2017.08.073
2017 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Ecotoxicity of measured concentrations of soil-applied diesel: Effects on earthworm survival, dehydrogenase, urease and nitrification activities', Applied Soil Ecology, 119 1-7 (2017) [C1]

© 2017 Elsevier B.V. Diesel is an important petroleum product, and a common pollutant in soil caused by leaks and accidental spills. Studies dealing with the ecotoxicity of diese... [more]

© 2017 Elsevier B.V. Diesel is an important petroleum product, and a common pollutant in soil caused by leaks and accidental spills. Studies dealing with the ecotoxicity of diesel towards earthworms always relied on growth inhibition endpoint (EC 50 ) values that were determined based on the spiked concentrations (nominal), ignoring the substantial portion of hydrocarbons volatilized from soil. In the present study we used, for the first time, the measured concentrations of total petroleum hydrocarbons (TPHs) from soil-applied diesel to assess earthworm (Eisenia fetida) survival, and the activities of dehydrogenase, urease and nitrification as indicators of soil health. The mortality endpoint (LC 50 ) value for initially measured concentrations after exposure of earthworms to diesel for 28¿days was 916¿±¿10¿mg TPHs kg -1 soil which was equivalent to the nominal (initially added) concentration of 1426¿±¿19¿mg TPHs kg -1 soil. Morphological abnormalities such as clitella swelling and curling were noticed when the measured concentrations of diesel were more than 971¿mg¿kg -1 soil. Significant increases in activities of soil dehydrogenase (38¿58%) as well as urease were observed in the diesel-applied soil. Presence of earthworms further enhanced the activities of these soil enzymes. Nitrification was sensitive to application of diesel to soil, and it was inhibited in a dose-related manner even in the presence of earthworms. The differential response of the toxicity criteria to diesel-contaminated soil observed in the present study clearly warrants more studies involving several soil health parameters to arrive at a generalization of ecotoxicity of an environmental pollutant.

DOI 10.1016/j.apsoil.2017.05.017
Citations Scopus - 2Web of Science - 1
Co-authors Ravi Naidu
2017 Cheng Y, Wang L, Faustorilla V, Mallavarapu M, Naidu R, Chen Z, 'Integrated electrochemical treatment systems for facilitating the bioremediation of oil spill contaminated soil', Chemosphere, 175 294-299 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.02.079
Citations Scopus - 1Web of Science - 1
Co-authors Zuliang Chen, Liang Wang, Ravi Naidu
2017 Mahbub KR, Krishnan K, Andrews S, Venter H, Naidu R, Mallavarapu M, 'Bio-augmentation and nutrient amendment decrease concentration of mercury in contaminated soil', Science of the Total Environment, 576 303-309 (2017) [C1]
DOI 10.1016/j.scitotenv.2016.10.083
Citations Scopus - 6Web of Science - 6
Co-authors Kannan Krishnan, Ravi Naidu
2017 Mahbub KR, Bahar MM, Labbate M, Krishnan K, Andrews S, Naidu R, Megharaj M, 'Bioremediation of mercury: not properly exploited in contaminated soils!', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 101 963-976 (2017) [C1]
DOI 10.1007/s00253-016-8079-2
Citations Scopus - 1Web of Science - 1
Co-authors Mezbaul Bahar, Ravi Naidu, Kannan Krishnan
2017 Nookongbut P, Kantachote D, Krishnan K, Mallavarapu M, 'Arsenic resistance genes of As-resistant purple nonsulfur bacteria isolated from As-contaminated sites for bioremediation application', JOURNAL OF BASIC MICROBIOLOGY, 57 316-324 (2017) [C1]
DOI 10.1002/jobm.201600584
Co-authors Kannan Krishnan
2017 Wang L, Cheng Y, Lamb D, Lesniewski P, Chen Z, Mallavarapu M, Naidu R, 'Novel recalibration methodologies for ion-selective electrode arrays in the multi-ion interference scenario', Journal of Chemometrics, 31 (2017) [C1]
DOI 10.1002/cem.2870
Co-authors Zuliang Chen, Dane Lamb, Liang Wang, Ravi Naidu
2017 Kuppusamy S, Venkateswarlu K, Thavamani P, Lee YB, Naidu R, Megharaj M, 'Quercus robur acorn peel as a novel coagulating adsorbent for cationic dye removal from aquatic ecosystems', ECOLOGICAL ENGINEERING, 101 3-8 (2017) [C1]
DOI 10.1016/j.ecoleng.2017.01.014
Co-authors Thava Palanisami, Ravi Naidu
2017 Mahbub K, Krishnan K, Naidu R, Megharaj M, 'Development of a whole cell biosensor for the detection of inorganic mercury', Environmental Technology and Innovation, 8 64-70 (2017) [C1]
DOI 10.1016/j.eti.2017.04.003
Citations Scopus - 1
Co-authors Kannan Krishnan, Ravi Naidu
2017 Fang C, Megharaj M, Naidu R, 'Electrochemical Detection of Thioether-Based Fluorosurfactants in Aqueous Film-Forming Foam (AFFF)', Electroanalysis, 29 1095-1102 (2017) [C1]
DOI 10.1002/elan.201600724
Co-authors Ravi Naidu, Cheng Fang
2017 Fang C, Megharaj M, Naidu R, 'Electrochemical Studies on Self-Assembled Monolayer (SAM) Upon Exposure to Anionic Surfactants: PFOA, PFOS, SDS and SDBS', Electroanalysis, 29 2155-2160 (2017) [C1]
DOI 10.1002/elan.201700108
Co-authors Ravi Naidu, Cheng Fang
2017 Wang ZQ, Li YB, Tan XP, He WX, Xie W, Megharaj M, Wei GH, 'Effect of arsenate contamination on free, immobilized and soil alkaline phosphatases: activity, kinetics and thermodynamics', EUROPEAN JOURNAL OF SOIL SCIENCE, 68 126-135 (2017) [C1]
DOI 10.1111/ejss.12397
Citations Scopus - 2Web of Science - 1
2017 Fang C, Megharaj M, Naidu R, 'Electrochemical switch on-off response of a self-assembled monolayer (SAM) upon exposure to perfluorooctanoic acid (PFOA)', JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 785 249-254 (2017) [C1]
DOI 10.1016/j.jelechem.2016.12.040
Citations Scopus - 1Web of Science - 1
Co-authors Cheng Fang, Ravi Naidu
2017 Khandaker Rayhan Mahbub, Krishnan K, Naidu R, Mallavarapu M, 'Mercury remediation potential of a mercury resistant strain Sphingopyxis sp. SE2 isolated from contaminated soil', Journal of Environmental Sciences, 51 128-137 (2017) [C1]
DOI 10.1016/j.jes.2016.06.032
Citations Web of Science - 1
Co-authors Ravi Naidu, Kannan Krishnan
2017 Khandaker Rayhan Mahbub, Krishnan K, Naidu R, Megharaj M, 'Mercury toxicity to Eisenia fetida in three different soils', Environmental Science and Pollution Research, 24 1261-1269 (2017) [C1]
DOI 10.1007/s11356-016-7869-5
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Kannan Krishnan
2017 Wijayawardena AMA, Megharaj M, Naidu R, 'Bioaccumulation and toxicity of lead, influenced by edaphic factors: using earthworms to study the effect of Pb on ecological health', Journal of Soils and Sediments, 17 1064-1072 (2017) [C1]
DOI 10.1007/s11368-016-1605-0
Co-authors Ayanka Wijayawardena, Ravi Naidu
2017 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Toxicity of diesel water accommodated fraction toward microalgae, Pseudokirchneriella subcapitata and Chlorella sp MM3', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 142 538-543 (2017) [C1]
DOI 10.1016/j.ecoenv.2017.04.052
Co-authors Ravi Naidu
2017 Mahbub KR, Krishnan K, Naidu R, Andrews S, Megharaj M, 'Mercury toxicity to terrestrial biota', ECOLOGICAL INDICATORS, 74 451-462 (2017) [C1]
DOI 10.1016/j.ecolind.2016.12.004
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu, Kannan Krishnan
2017 Subashchandrabose SR, Logeshwaran P, Venkateswarlu K, Naidu R, Megharaj M, 'Pyrene degradation by Chlorella sp MM3 in liquid medium and soil slurry: Possible role of dihydrolipoamide acetyltransferase in pyrene biodegradation', ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 23 223-232 (2017) [C1]
DOI 10.1016/j.algal.2017.02.010
Co-authors Suresh Subashchandrabose, Logeshwaran Panneerselvan, Ravi Naidu
2017 Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Evaluation of relative bioaccessibility leaching procedure for an assessment of lead bioavailability in mixed metal contaminated soils', Environmental Technology and Innovation, 7 229-238 (2017) [C1]

© 2017 This study investigates the effect of contaminant zinc (Zn) on lead (Pb) bioavailability and bioaccessibility in six contrasting soils spiked with 1500 mg Pb/kg and aged 1... [more]

© 2017 This study investigates the effect of contaminant zinc (Zn) on lead (Pb) bioavailability and bioaccessibility in six contrasting soils spiked with 1500 mg Pb/kg and aged 12 months under laboratory conditions. Zn was added to the soils (7500 mgZn/kg soil) and aged for a further two weeks. In vivo studies were conducted using juvenile swine as a surrogate model for young children. Two compartment pharmacokinetic models were used to analyze the biological response produced by Pb oral solution and spiked soils. Absolute and relative bioavailability of Pb in soils (oral dose of 100 µ g Pb/kg body weight/day) were estimated by comparing them with intravenously administered soluble Pb salt (25 µ g Pb/kg/day) and orally administered the same Pb salt [Pb acetate =(CH 3 COO) 2 Pb·3H 2 O] administered to 3 juvenile pigs per treatment. Lead bioaccessibility was calculated using the in vitro RBALP (i.e. relative bioaccessibility leaching procedure) method. The in vitro results of RBALP were compared to in vivo relative Pb bioavailability to ascertain whether the changes in bioaccessibility correlated with the in vivo data. Although the in vivo Pb relative bioavailability (RB) in all soils except in MLA (Mount Lofty Acidic) revealed an increase (18%¿159%) in the presence of Zn, the in vitro RBALP bioaccessibility results indicated otherwise (1%¿38% decrease). In vivo RB of Pb in MLA declined by 37% in the presence of Zn. However, the RBALP in vitro bioaccessible Pb did not correlate with the relative bioavailabilities of Pb in the juvenile swine dosing experiment. Caution is therefore needed when predicting Pb bioavailability/bioaccessibility in the presence of metal mixtures. The literature contains much information on the correlation of metal and metalloid bioaccessibility with their bioavailability. There is, however, a paucity of studies investigating the effects of other metals on Pb and their IVIVC (in vitro and in vivo correlations). The current study addresses this knowledge gap by assessing in vivoand in vitro bioavailability of Pb in the presence of Zn.

DOI 10.1016/j.eti.2017.02.007
Co-authors Ravi Naidu, Ayanka Wijayawardena, Thava Palanisami, Dane Lamb
2017 Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Zinc-arsenic interactions in soil: Solubility, toxicity and uptake', Chemosphere, 187 357-367 (2017) [C1]

© 2017 Elsevier Ltd Arsenic (As) and zinc (Zn) are common co-contaminants in mining impacted soils. Their interaction on solubility and toxicity when present concurrently is not ... [more]

© 2017 Elsevier Ltd Arsenic (As) and zinc (Zn) are common co-contaminants in mining impacted soils. Their interaction on solubility and toxicity when present concurrently is not well understood in natural systems. The aim of this study was to observe their interaction in solubility (soil-solution), bioaccumulation (shoot uptake) and toxicity to cucumber (Cucumis sativa L) conducting 4 weeks pot study in 5 different soils spiked with As (0, 2, 4, 8 to 1024 mg kg -1 ) individually and with Zn at two phytotoxic doses. The As pore-water concentration was significantly reduced (df = 289, Adjusted R 2 = 0.84, p < 0.01) in the presence of Zn in the whole dataset, whereas Zn and Zn 2+ activity in pore-water was reduced significantly only in the two alkaline soils. This outcome may be due to adsorption/surface precipitation or tertiary bridging complexation. No homogenous precipitation of zinc arsenate could be established using electron microscopy, XRD or even equilibrium calculations. For bioaccumulation phase, no significant effect of Zn on As uptake was observed except acidic MG soil whereas, Zn uptake was significantly reduced (p < 0.05) by As in whole dataset. However, an additive response was observed mostly except acidic MG soil. The synergistic response (more than additive) was predominant in this soil for a wide range of inhibition concentration (0¿80%) at both Zn EC10 and EC50 levels. Since additive response is mostly considered in risk assessment for mixtures, precautions should be implemented for assessment of toxicity for As-Zn mixture in acidic soil due to their synergistic response in some soils.

DOI 10.1016/j.chemosphere.2017.08.093
Co-authors Ravi Naidu, Dane Lamb, Liang Wang
2017 Fang C, Megharaj M, Naidu R, 'Electrochemical Advanced Oxidation Processes (EAOP) to degrade per- and polyflluoroalkyl substances (PFASs)', JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, 20 (2017) [C1]
DOI 10.1515/jaots-2017-0014
Co-authors Cheng Fang, Ravi Naidu
2017 Cheng Y, Mallavarapu M, Naidu R, Chen Z, 'In situ fabrication of green reduced graphene-based biocompatible anode for efficient energy recycle.', Chemosphere, 193 618-624 (2017)
DOI 10.1016/j.chemosphere.2017.11.057
Co-authors Zuliang Chen
2017 Kuppusamy S, Thavamani P, Venkateswarlu K, Lee YB, Naidu R, Megharaj M, 'Remediation approaches for polycyclic aromatic hydrocarbons (PAHs) contaminated soils: Technological constraints, emerging trends and future directions', CHEMOSPHERE, 168 944-968 (2017) [C1]
DOI 10.1016/j.chemosphere.2016.10.115
Citations Scopus - 16Web of Science - 13
Co-authors Thava Palanisami, Ravi Naidu
2017 Mahbub KR, Subashchandrabose SR, Krishnan K, Naidu R, Megharaj M, 'Mercury alters the bacterial community structure and diversity in soil even at concentrations lower than the guideline values', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 101 2163-2175 (2017) [C1]
DOI 10.1007/s00253-016-7965-y
Citations Scopus - 2Web of Science - 2
Co-authors Suresh Subashchandrabose, Ravi Naidu, Kannan Krishnan
2017 Fang C, Dharmarajan R, Mallavarapu M, Naidu R, 'Gold nanoparticle-based optical sensors for selected anionic contaminants', Trends in Analytical Chemistry, 86 143-154 (2017) [C1]
DOI 10.1016/j.trac.2016.10.008
Citations Scopus - 6Web of Science - 4
Co-authors Cheng Fang, Raja Dharmarajan, Ravi Naidu
2017 Mahbub KR, Kader M, Krishnan K, Labbate M, Naidu R, Megharaj M, 'Toxicity of Inorganic Mercury to Native Australian Grass Grown in Three Different Soils', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 98 850-855 (2017) [C1]
DOI 10.1007/s00128-017-2096-4
Co-authors Ravi Naidu, Kannan Krishnan
2016 Mahbub K, Krishnan, Mallavarapu, Naidu, 'Mercury Inhibits Soil Enzyme Activity in a Lower Concentration than the Guideline Value', Bulletin of Environmental Contamination and Toxicology, 96 76-82 (2016) [C1]
DOI 10.1007/s00128-015-1664-8
Citations Scopus - 6Web of Science - 5
Co-authors Kannan Krishnan, Ravi Naidu
2016 Venkidusamy K, Megharaj M, Marzorati M, Lockington R, Naidu R, 'Enhanced removal of petroleum hydrocarbons using a bioelectrochemical remediation system with pre-cultured anodes', Science of the Total Environment, 539 61-69 (2016) [C1]

© 2015 Elsevier B.V. Bioelectrochemical remediation (BER) systems such as microbial fuel cells (MFCs) have recently emerged as a green technology for the effective remediation of... [more]

© 2015 Elsevier B.V. Bioelectrochemical remediation (BER) systems such as microbial fuel cells (MFCs) have recently emerged as a green technology for the effective remediation of petroleum hydrocarbon contaminants (PH) coupled with simultaneous energy recovery. Recent research has shown that biofilms previously enriched for substrate degrading bacteria resulted in excellent performance in terms of substrate removal and electricity generation but the effects on hydrocarbon contaminant degradation were not examined. Here we investigate the differences between enriched biofilm anodes and freshly inoculated new anodes in diesel fed single chamber mediatorless microbial fuel cells (DMFC) using various techniques for the enhancement of PH contaminant remediation with concomitant electricity generation. An anodophilic microbial consortium previously selected for over a year through continuous culturing with a diesel concentration of about 800mgl < sup > -1 < /sup > and which now showed complete removal of this concentration of diesel within 30days was compared to that of a freshly inoculated new anode MFC (showing 83.4% removal of diesel) with a simultaneous power generation of 90.81mW/m < sup > 2 < /sup > and 15.04mW/m < sup > 2 < /sup > respectively. The behaviour of pre-cultured anodes at a higher concentration of PH (8000mgl < sup > -1 < /sup > ) was also investigated. Scanning electron microscopy observ ation revealed a thick biofilm covering the pre-cultured anodic electrode but not the anode from the freshly inoculated MFC. High resolution imaging showed the presence of thin 60nm diametre pilus-like projections emanating from the cells. Anodic microbial community profiling confirmed that the selection for diesel degrading exoelectrogenic bacteria had occurred. Identification of a biodegradative gene (alkB) provided strong evidence of the catabolic pathway used for diesel degradation in the DMFCs.

DOI 10.1016/j.scitotenv.2015.08.098
Citations Scopus - 10Web of Science - 10
Co-authors Ravi Naidu
2016 Subramaniyam V, Subashchandrabose SR, Thavamani P, Chen Z, Krishnamurti GSR, Naidu R, Megharaj M, 'Toxicity and bioaccumulation of iron in soil microalgae', Journal of Applied Phycology, 28 2767-2776 (2016) [C1]

© 2016, Springer Science+Business Media Dordrecht. Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability a... [more]

© 2016, Springer Science+Business Media Dordrecht. Microalgae are extensively used in the remediation of heavy metals like iron. However, factors like toxicity, bioavailability and iron speciation play a major role in its removal by microalgae. Thus, in this study, toxicity of three different iron salts (FeSO 4 , FeCl 3 and Fe(NO 3 ) 3 ) was evaluated towards three soil microalgal isolates, Chlorella sp. MM3, Chlamydomonas sp. MM7 and Chlorococcum sp. MM11. Interestingly, all the three iron salts gave different EC50 concentrations; however, ferric nitrate was found to be significantly more toxic followed by ferrous sulphate and ferric chloride. The EC 50 analysis revealed that Chlorella sp. was significantly resistant to iron compared to other microalgae. However, almost 900¿µg¿g -1 iron was accumulated by Chlamydomonas sp. grown with 12¿mg¿L -1 ferric nitrate as an iron source when compared to other algae and iron salts. The time-course bioaccumulation confirmed that all the three microalgae adsorb the ferric salts such as ferric nitrate and ferric chloride more rapidly than ferrous salt, whereas intracellular accumulation was found to be rapid for ferrous salts. However, the amount of iron accumulated or adsorbed by algae, irrespective of species, from ferrous sulphate medium is comparatively lower than ferric chloride and ferric nitrate medium. The Fourier transform infrared spectroscopy (FTIR) analysis shows that the oxygen atom and P = O group of polysaccharides present in the cell wall of algae played a major role in the bioaccumulation of iron ions by algae.

DOI 10.1007/s10811-016-0837-0
Citations Scopus - 1
Co-authors Thava Palanisami, Zuliang Chen, Suresh Subashchandrabose, Ravi Naidu
2016 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'Characterization of bimetallic Fe/Pd nanoparticles by grape leaf aqueous extract and identification of active biomolecules involved in the synthesis', SCIENCE OF THE TOTAL ENVIRONMENT, 562 526-532 (2016) [C1]
DOI 10.1016/j.scitotenv.2016.04.060
Citations Scopus - 4Web of Science - 3
Co-authors Zuliang Chen, Ravi Naidu
2016 Nirola R, Megharaj M, Saint C, Aryal R, Thavamani P, Venkateswarlu K, et al., 'Metal bioavailability to Eisenia fetida through copper mine dwelling animal and plant litter, a new challenge on contaminated environment remediation', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 113 208-216 (2016) [C1]
DOI 10.1016/j.ibiod.2016.03.007
Citations Scopus - 1Web of Science - 1
Co-authors Thava Palanisami, Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Oak (Quercus robur) Acorn Peel as a Low-Cost Adsorbent for Hexavalent Chromium Removal from Aquatic Ecosystems and Industrial Effluents', Water, Air, and Soil Pollution, 227 (2016) [C1]

© 2016 Springer International Publishing. The efficiency of low-cost, abundantly available local forestry waste, oak (Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from ... [more]

© 2016 Springer International Publishing. The efficiency of low-cost, abundantly available local forestry waste, oak (Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from aqueous solutions was studied in a batch system as a function of contact time, adsorbate concentration, adsorbent dosage, and pH. In an equilibrium time of 420 min, the maximum Cr removal by OP at pH 2 and 10 was 100 and 97 %, respectively. The sorption data fitted well with Langmuir adsorption model. Evaluation using Langmuir expression presented a monolayer sorption capacity of 47.39 mg g -1 with an equilibrium sorbent dose of 5 g L -1 and pH 7. Uptake of Cr by OP was described by pseudo-second-order chemisorption model. ICP-OES, LC-ICPMS analysis of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal is by 'integrated adsorption and reduction' mechanism. ESEM-EDX and XRD analysis of OP before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to less toxic Cr 3+ forms followed by complexation onto the adsorbent surface contributed to the removal of Cr(VI). Consistent with batch studies, OP effectively removed ( > 95 %) Cr from the real water samples collected from lake and sea. The results of this study illustrate that OP could be an economical, green, and effective biomaterial for Cr(VI) removal from natural aquatic ecosystems and industrial effluents.

DOI 10.1007/s11270-016-2760-z
Citations Scopus - 8Web of Science - 4
Co-authors Ravi Naidu, Thava Palanisami
2016 Liu C, Subashchandrabose SR, Mallavarapu M, Hu Z, Xiao B, 'Diplosphaera sp. MM1 ¿ A microalga with phycoremediation and biomethane potential', Bioresource Technology, 218 1170-1177 (2016) [C1]
DOI 10.1016/j.biortech.2016.07.077
Citations Scopus - 1Web of Science - 1
Co-authors Suresh Subashchandrabose
2016 Munagamage T, Rathnayake IVN, Pathiratne A, Megharaj M, 'Sensitivity of Four Cyanobacterial Isolates from Tropical Freshwaters to Environmentally Realistic Concentrations of Cr(6+), Cd(2+) and Zn(2.).', Bulletin of environmental contamination and toxicology, 96 816-821 (2016) [C1]
DOI 10.1007/s00128-016-1809-4
Citations Scopus - 1Web of Science - 1
2016 Mahbub KR, Krishnan K, Megharaj M, Naidu R, 'Bioremediation potential of a highly mercury resistant bacterial strain Sphingobium SA2 isolated from contaminated soil', Chemosphere, 144 330-337 (2016) [C1]

© 2015 Elsevier Ltd. A mercury resistant bacterial strain, SA2, was isolated from soil contaminated with mercury. The 16S rRNA gene sequence of this isolate showed 99% sequence s... [more]

© 2015 Elsevier Ltd. A mercury resistant bacterial strain, SA2, was isolated from soil contaminated with mercury. The 16S rRNA gene sequence of this isolate showed 99% sequence similarity to the genera Sphingobium and Sphingomonas of a-proteobacteria group. However, the isolate formed a distinct phyletic line with the genus Sphingobium suggesting the strain belongs to Sphingobium sp. Toxicity studies indicated resistance to high levels of mercury with estimated EC 50 values 4.5 mg L -1 and 44.15 mg L -1 and MIC values 5.1 mg L -1 and 48.48 mg L -1 in minimal and rich media, respectively. The strain SA2 was able to volatilize mercury by producing mercuric reductase enzyme which makes it potential candidate for remediating mercury. ICP-QQQ-MS analysis of Hg supplemented culture solutions confirmed that almost 79% mercury in the culture suspension was volatilized in 6 h. A very small amount of mercury was observed to accumulate in cell pellets which was also evident according to ESEM-EDX analysis. The mercuric reductase gene merA was amplified and sequenced. The deduced amino acid sequence demonstrated sequence homology with a-proteobacteria and Ascomycota group.

DOI 10.1016/j.chemosphere.2015.08.061
Citations Scopus - 12Web of Science - 9
Co-authors Ravi Naidu, Kannan Krishnan
2016 Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Pyrosequencing analysis of bacterial diversity in soils contaminated long-term with PAHs and heavy metals: Implications to bioremediation', Journal of Hazardous Materials, 317 169-179 (2016) [C1]

© 2016 Elsevier B.V.. Diversity, distribution and composition of bacterial community of soils contaminated long-term with both polycyclic aromatic hydrocarbons (PAHs) and heavy m... [more]

© 2016 Elsevier B.V.. Diversity, distribution and composition of bacterial community of soils contaminated long-term with both polycyclic aromatic hydrocarbons (PAHs) and heavy metals were explored for the first time following 454 pyrosequencing. Strikingly, the complete picture of the Gram positive (+ve) and Gram negative (-ve) bacterial profile obtained in our study illustrates novel postulates that include: (1) Metal-tolerant and PAH-degrading Gram -ves belonging to the class Alphaproteobacteria persist relatively more in the real contaminated sites compared to Gram +ves, (2) Gram +ves are not always resistant to heavy metal toxicity, (3) Stenotrophomonas followed by Burkholderia and Pseudomonas are the dominant genera of PAH degraders with high metabolic activity in long-term contaminated soils, (4) Actinobacteria is the predominant group among the Gram +ves in soils contaminated with high molecular weight PAHs that co-exist with toxic heavy metals like Pb, Cu and Zn, (5) Microbial communities are nutrient-driven in natural environments and (6) Catabolically potential Gram +/-ves with diverse applicability to remediate the real contaminated sites evolve eventually in the historically-polluted soils. Thus, the most promising indigenous Gram +/-ve strains from the long-term contaminated sites with increased catabolic potential, enzymatic activity and metal tolerance need to be harnessed for mixed contaminant cleanups.

DOI 10.1016/j.jhazmat.2016.05.066
Citations Scopus - 12Web of Science - 7
Co-authors Thava Palanisami, Ravi Naidu
2016 Mayilswami S, Krishnan K, Megharaj M, Naidu R, 'Gene expression profile changes in Eisenia fetida chronically exposed to PFOA', Ecotoxicology, 25 759-769 (2016) [C1]

© 2016, Springer Science+Business Media New York. Eisenia fetida is a terrestrial organism, which can be used to diagnose sub-lethal concentrations of PFOA by using molecular bio... [more]

© 2016, Springer Science+Business Media New York. Eisenia fetida is a terrestrial organism, which can be used to diagnose sub-lethal concentrations of PFOA by using molecular biomarkers. In order to identify potential molecular biomarkers, we have exposed E.¿fetida to 10¿mg/kg of PFOA in soil for 8¿months. The mRNA isolation, sequencing, transcriptome assembly followed by differential gene expression studies have revealed that genes that are involved in apoptotic process, reproduction, calcium signalling, neuronal development and lipid metabolism are predominantly affected. Highly specific genes that are altered by PFOA can be further validated and used as biomarker to detect sub-lethal concentrations of PFOA in the soil.

DOI 10.1007/s10646-016-1634-x
Citations Scopus - 4Web of Science - 3
Co-authors Kannan Krishnan, Ravi Naidu
2016 Abbasian F, Lockington R, Palanisami T, Megharaj M, Naidu R, 'Multiwall carbon nanotubes increase the microbial community in crude oil contaminated fresh water sediments', Science of the Total Environment, 539 370-380 (2016) [C1]

© 2015 Elsevier B.V. Since crude oil contamination is one of the biggest environmental concerns, its removal from contaminated sites is of interest for both researchers and indus... [more]

© 2015 Elsevier B.V. Since crude oil contamination is one of the biggest environmental concerns, its removal from contaminated sites is of interest for both researchers and industries. In situ bioremediation is a promising technique for decreasing or even eliminating crude oil and hydrocarbon contamination. However, since these compounds are potentially toxic for many microorganisms, high loads of contamination can inhibit the microbial community and therefore reduce the removal rate. Therefore, any strategy with the ability to increase the microbial population in such circumstances can be of promise in improving the remediation process. In this study, multiwall carbon nanotubes were employed to support microbial growth in sediments contaminated with crude oil. Following spiking of fresh water sediments with different concentrations of crude oil alone and in a mixture with carbon nanotubes for 30. days, the microbial profiles in these sediments were obtained using FLX-pyrosequencing. Next, the ratios of each member of the microbial population in these sediments were compared with those values in the untreated control sediment. This study showed that combination of crude oil and carbon nanotubes can increase the diversity of the total microbial population. Furthermore, these treatments could increase the ratios of several microorganisms that are known to be effective in the degradation of hydrocarbons.

DOI 10.1016/j.scitotenv.2015.09.031
Citations Scopus - 6Web of Science - 5
Co-authors Thava Palanisami, Ravi Naidu
2016 Yirsaw BD, Mayilswami S, Megharaj M, Chen Z, Naidu R, 'Effect of zero valent iron nanoparticles to Eisenia fetida in three soil types', Environmental Science and Pollution Research, 23 9822-9831 (2016) [C1]

© 2016, Springer-Verlag Berlin Heidelberg. In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component,... [more]

© 2016, Springer-Verlag Berlin Heidelberg. In this study, the influence of soil types on the effect of the commercial form of C-nZVI on tissue concentrations, cellular component, reproduction outcome in Eisenia fetida, and the soil health was investigated. C-nZVI at concentration level of 3¿g¿kg -1 soil showed no effect on the survival of E. fetida in the three soil types. However, varying effects such as concentration-dependent increase in tissue iron concentration, lipid peroxidation, and damage to DNA molecules by C-nZVI were observed. C-nZVI at an exposure concentration of 60¿mg¿kg -1 soil induced oxidative stress in E. fetida. Tissue Fe concentration appeared correlated to the DNA damage. Oxidative stress and DNA damage may explain the toxicity mechanisms of nZVI to E. fetida. [Figure not available: see fulltext.].

DOI 10.1007/s11356-016-6193-4
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu, Zuliang Chen
2016 Nirola R, Megharaj M, Aryal R, Naidu R, 'Screening of metal uptake by plant colonizers growing on abandoned copper mine in Kapunda, South Australia', International Journal of Phytoremediation, 18 399-405 (2016) [C1]

© 2016, © Taylor &amp; Francis Group, LLC.Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu ... [more]

© 2016, © Taylor & Francis Group, LLC.Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu concentrations in the soils at this former mine ranged from 65¿10107¿mg kg-1. The pH and EC varied widely in the 3.9¿8.4 and 152¿7311¿µS ranges, respectively. Nine plant species growing over the copper mine site were selected to screen for metal uptake to determine their suitability for phytoremediation. The Australian native tree species Eucalyptus camaldulensis indicated enrichment factor (EF) of 2.17, 1.89, and 1.30 for Cu, Zn, and Pb, respectively, suggesting that this species of tree can accumulate these metals to some degree. The stress-resistant exotic olive, Olea europaea exhibited EF of = 0.01 for Cu, Cd, and Pb, and 0.29 for Zn, which is characteristic of an excluder plant. Acacia pycnantha, the Australian pioneer legume species with EF 0.03, 0.80, 0.32, and 0.01 for Cu, Zn, Cd, and Pb, respectively, emerged as another strong metal excluder and consequently as an ideal metal stabilizer.

DOI 10.1080/15226514.2015.1109599
Citations Scopus - 3Web of Science - 5
Co-authors Ravi Naidu
2016 Abbasian F, Palanisami T, Megharaj M, Naidu R, Lockington R, Ramadass K, 'Microbial diversity and hydrocarbon degrading gene capacity of a crude oil field soil as determined by metagenomics analysis', Biotechnology Progress, 32 638-648 (2016) [C1]

© 2016 American Institute of Chemical Engineers Soils contaminated with crude oil are rich sources of enzymes suitable for both degradation of hydrocarbons through bioremediation... [more]

© 2016 American Institute of Chemical Engineers Soils contaminated with crude oil are rich sources of enzymes suitable for both degradation of hydrocarbons through bioremediation processes and improvement of crude oil during its refining steps. Due to the long term selection, crude oil fields are unique environments for the identificati on of microorganisms with the ability to produce these enzymes. In this metagenomic study, based on Hiseq Illumina sequencing of samples obtained from a crude oil field and analysis of data on MG-RAST, Actinomycetales (9.8%) were found to be the dominant microorganisms, followed by Rhizobiales (3.3%). Furthermore, several functional genes were found in this study, mostly belong to Actinobacteria (12.35%), which have a role in the metabolism of aliphatic and aromatic hydrocarbons (2.51%), desulfurization (0.03%), element shortage (5.6%), and resistance to heavy metals (1.1%). This information will be useful for assisting in the application of microorganisms in the removal of hydrocarbon contamination and/or for improving the quality of crude oil. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:638¿648, 2016.

DOI 10.1002/btpr.2249
Citations Scopus - 3Web of Science - 2
Co-authors Thava Palanisami, Ravi Naidu
2016 Luo F, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of trichloroethylene and hexavalent chromium by green synthesized agarose-Fe nanoparticles hydrogel', Chemical Engineering Journal, 294 290-297 (2016) [C1]

© 2016 Elsevier B.V. The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe... [more]

© 2016 Elsevier B.V. The development of highly efficient, eco-friendly and cost-effective remediation technology to remove mixed contaminants is now in progress. Here, agarose-Fe nanoparticles (NPs) hydrogel were produced via two green steps to remove mixed contaminants, specifically trichloroethylene (TCE) and hexavalent chromium (Cr(VI)). Approx. 84.9% of Cr(VI) and 93.8% of TCE were simultaneously removed over 24 h in their co-existing solution, while 94.1% of Cr(VI) and 97.2% of TCE were separately removed by agarose-Fe NPs hydrogel. Scanning Electron Microscopy (SEM) suggested that the macroporosity of agarose-Fe NPs hydrogel facilitated the mass transfer between agarose-Fe NPs hydrogels and mixed contaminants, and that Fe NPs were uniformly immobilized into the hydrogel. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) provided evidence supporting the co-removal mechanism. XPS result indicated that: (1) chemical reduction played a role in the removal of both Cr(VI) and TCE; and (2) iron oxides and Fe(III)-Cr(III) complexes might be formed after reaction. FTIR result showed that some functional groups were involved in the removal process. Moreover, the presence of iron oxides were confirmed by FTIR. Both SEM and XPS results verified that encapsulation could describe such immobilization of Fe NPs using agarose. Finally, the kinetics study supported the removal mechanism. Such encapsulation of Fe NPs via a green strategy is simple, quick, and cost-effective, making in situ remediation of mixed contaminants more favorable.

DOI 10.1016/j.cej.2016.03.005
Citations Scopus - 11Web of Science - 10
Co-authors Zuliang Chen, Ravi Naidu
2016 Venkateswarlu K, Nirola R, Kuppusamy S, Thavamani P, Naidu R, Megharaj M, 'Abandoned metalliferous mines: ecological impacts and potential approaches for reclamation', Reviews in Environmental Science and Biotechnology, 15 327-354 (2016) [C1]

© 2016, Springer Science+Business Media Dordrecht. The lack of awareness for timely management of the environment surrounding a metal mine site results in several adverse consequ... [more]

© 2016, Springer Science+Business Media Dordrecht. The lack of awareness for timely management of the environment surrounding a metal mine site results in several adverse consequences such as rampant business losses, abandoning the bread-earning mining industry, domestic instability and rise in ghost towns, increased environmental pollution, and indirect long-term impacts on the ecosystem. Although several abandoned mine lands (AMLs) exist globally, information on these derelict mines has not been consolidated in the literature. We present here the state-of-the-art on AMLs in major mining countries with emphasis on their impact towards soil health and biodiversity, remediation methods, and laws governing management of mined sites. While reclamation of metalliferous mines by phytoremediation is still a suitable option, there exist several limitations for its implementation. However, many issues of phytoremediation at the derelict mines can be resolved following phytostabilization, a technology that is effective also at the modern operational mine sites. The use of transgenic plant species in phytoremediation of metals in contaminated sites is also gaining momentum. In any case, monitoring and efficacy testing for bioremediation of mined sites is essential. The approaches for reclamation of metalliferous mines such as environmental awareness, effective planning and assessment of pre- and post-mining activities, implementation of regulations, and a safe and good use of phytostabilizers among the native plants for revegetation and ecological restoration are discussed in detail in the present review. We also suggest the use of microbially-enhanced phytoremediation and nanotechnology for efficient reclamation of AMLs, and identify future work warranted in this area of research. Further, we believe that the integration of science of remediation with mining policies and regulations is a reliable option which when executed can virtually balance economic development and environmental destruction for safer future.

DOI 10.1007/s11157-016-9398-6
Citations Scopus - 5Web of Science - 4
Co-authors Thava Palanisami, Ravi Naidu
2016 Bahar MM, Megharaj M, Naidu R, 'Oxidation of arsenite to arsenate in growth medium and groundwater using a novel arsenite-oxidizing diazotrophic bacterium isolated from soil', International Biodeterioration and Biodegradation, 106 178-182 (2016) [C1]

© 2015 Elsevier Ltd. An arsenic hyper-tolerant diazotrophic bacterium was isolated from a heavy metal contaminated soil. The pure isolate MM-17 was identified as Azospirillum sp.... [more]

© 2015 Elsevier Ltd. An arsenic hyper-tolerant diazotrophic bacterium was isolated from a heavy metal contaminated soil. The pure isolate MM-17 was identified as Azospirillum sp. based on phylogenetic analysis of 16S rRNA. The strain oxidized 100 µM As(III) to As(V) in both culture media (minimal salts) and real groundwater within 8 and 10 h, respectively. The oxidation of As(III) by this strain was observed within the pH range 5-10 with the best performance at pH 7-8. As(III) oxidation was found to be independent of cell growth which implies the oxidation enzymes are constitutively expressed. The whole cell kinetic study highlighted a lower value of kinetic constant, K s as 32.9 µM As(III), which indicates that the strain MM-17 has greater affinity for As(III). The gene sequence of the large subunit of arsenite oxidase of MM-17 showed 99 and 72% similarity to the large subunit of arsenite oxidase of Stenotrophomonas sp. MM-7 and Sinorhizobium sp. M14, respectively. Sphaeroplasts experiments suggest that arsenite oxidase is a membrane associated protein in MM-17.

DOI 10.1016/j.ibiod.2015.10.019
Citations Scopus - 3Web of Science - 3
Co-authors Mezbaul Bahar, Ravi Naidu
2016 Lamb DT, Kader M, Wang L, Choppala G, Rahman MM, Megharaj M, Naidu R, 'Pore-Water Carbonate and Phosphate As Predictors of Arsenate Toxicity in Soil', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 50 13062-13069 (2016) [C1]
DOI 10.1021/acs.est.6b03195
Citations Scopus - 3Web of Science - 2
Co-authors Mahmud Rahman, Liang Wang, Ravi Naidu, Dane Lamb
2016 Venkidusamy K, Megharaj M, 'A Novel Electrophototrophic Bacterium Rhodopseudomonas palustris Strain RP2, Exhibits Hydrocarbonoclastic Potential in Anaerobic Environments.', Frontiers in microbiology, 7 1071 (2016) [C1]
DOI 10.3389/fmicb.2016.01071
Citations Scopus - 4Web of Science - 2
2016 Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Bioaugmentation with Novel Microbial Formula vs. Natural Attenuation of a Long-Term Mixed Contaminated Soil - Treatability Studies in Solid- and Slurry-Phase Microcosms', Water, Air, and Soil Pollution, 227 (2016) [C1]

© 2015 Springer International Publishing Switzerland. Treatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentatio... [more]

© 2015 Springer International Publishing Switzerland. Treatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentation for field-scale bioremediation of contaminated sites. In this study, the biodegradation of a mixture of seven PAHs in a manufactured gas plant (MGP) soil contaminated with 3967 mg kg -1 of total PAHs using novel acid-, metal-tolerant, N-fixing, P-solubilizing, and biosurfactant-producing LMW and HMW PAH-degrading bacterial combinations as inoculums was compared in slurry- and solid-phase microcosms over natural attenuation. Bioaugmentation of 5 % of bacterial consortia A and N in slurry- and solid-phase systems enhanced 4.6-5.7 and 9.3-10.7 % of total PAH degradation, respectively, over natural attenuation. Occurrence of 62.7-88 % of PAH biodegradation during natural attenuation in soil and slurry illustrated the accelerated rate of intrinsic metabolic activity of the autochthonous microbial community in the selected MGP soil. Monitoring of the total microbial activity and population of PAH degraders revealed that the observed biodegradation trend in MGP soil resulted from microbial mineralization. In the slurry, higher biodegradation rate constant (k) and lower half-life values (t 1/2 ) was observed during bioaugmentation with consortium N, highlighting the use of bioaugmentation in bioslurries/bioreactor to achieve rapid and efficient bioremediation compared to that of a static solid system. In general, natural attenuation was on par with bioaugmentation. Hence, depending on the type of soil, natural attenuation might outweigh bioaugmentation and a careful investigation using laboratory treatability studies are highly recommended before the upscale of a developed bioremediation strategy to field level.

DOI 10.1007/s11270-015-2709-7
Citations Scopus - 10Web of Science - 2
Co-authors Thava Palanisami, Ravi Naidu
2016 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'One-step green synthesis of bimetallic Fe/Pd nanoparticles used to degrade Orange II', Journal of Hazardous Materials, 303 145-153 (2016) [C1]

© 2015 Elsevier B.V. To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Gr... [more]

© 2015 Elsevier B.V. To reduce cost and enhance reactivity, bimetallic Fe/Pd nanoparticles (NPs) were firstly synthesized using grape leaf aqueous extract to remove Orange II. Green synthesized bimetallic Fe/Pd NPs (98.0%) demonstrated a far higher ability to remove Orange II in 12h compared to Fe NPs (16.0%). Meanwhile, all precursors, e.g., grape leaf extract, Fe 2+ and Pd 2+ , had no obvious effect on removing Orange II since less than 2.0% was removed. Kinetics study revealed that the removal rate fitted well to the pseudo-first-order reduction and pseudo-second-order adsorption model, meaning that removing Orange II via Fe/Pd NPs involved both adsorption and catalytic reduction. The remarkable stability of Fe/Pd NPs showed the potential application for removing azo dyes. Furthermore, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) confirmed the changes in Fe/Pd NPs before and after reaction with Orange II. High Performance Liquid Chromatography-Mass Spectrum (HPLC-MS) identified the degraded products in the removal of Orange II, and finally a removal mechanism was proposed. This one-step strategy using grape leaf aqueous extract to synthesize Fe/Pd NPs is simple, cost-effective and environmentally benign, making possible the large-scale production of Fe/Pd NPs for field remediation.

DOI 10.1016/j.jhazmat.2015.10.034
Citations Scopus - 12Web of Science - 13
Co-authors Zuliang Chen, Ravi Naidu
2016 Abbasian F, Lockington R, Megharaj M, Naidu R, 'A Review on the Genetics of Aliphatic and Aromatic Hydrocarbon Degradation', APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY, 178 224-250 (2016) [C1]
DOI 10.1007/s12010-015-1881-y
Citations Scopus - 7Web of Science - 6
Co-authors Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Nirola R, Lee YB, Naidu R, 'Assessment of antioxidant activity, minerals, phenols and flavonoid contents of common plant/tree waste extracts', INDUSTRIAL CROPS AND PRODUCTS, 83 630-634 (2016) [C1]
DOI 10.1016/j.indcrop.2015.12.060
Citations Scopus - 6Web of Science - 4
Co-authors Thava Palanisami, Ravi Naidu
2016 Venkidusamy K, Megharaj M, 'Identification of Electrode Respiring, Hydrocarbonoclastic Bacterial Strain Stenotrophomonas maltophilia MK2 Highlights the Untapped Potential for Environmental Bioremediation', Frontiers in Microbiology, 7 (2016) [C1]
DOI 10.3389/fmicb.2016.01965
2016 Fang C, Megharaj M, Naidu R, 'Surface-enhanced Raman scattering (SERS) detection of fluorosurfactants in firefighting foams', RSC Advances, 6 11140-11145 (2016) [C1]

© 2016 The Royal Society of Chemistry. We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous fir... [more]

© 2016 The Royal Society of Chemistry. We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous firefighting foams (AFFFs), by increasing their loading affinity and boosting their Raman activity. In order to increase FS's loading affinity, we introduced a cationic dye (ethyl violet or methyl blue) into the aqueous incubation solution to co-precipitate the FS onto the SERS substrate surface by forming an immiscible ion-pair (dye-FS). In the meantime, the Raman signal intensity was boosted due to the much higher Raman activity of the dye than that of FS. We compared two kinds of SERS substrate, patterned silver (Ag) surface and graphene oxide (GO) membrane, and noted the former (dye-FS-Ag) enhanced the Raman signal whilst the latter (dye-FS-GO) increased the loading affinity of the ion-pair due to the hydrophobic surface. We thus introduced silver nanoparticles (AgNPs) into the incubation solution (as well as dye) to co-precipitate FS onto the GO surface via an assembly of dye-FS-AgNP-GO. Using this assembly, we successfully detected FSs including pentadecafluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FTS), with a limit-of-detection (LOD) of ~50 ppb (~120 nM) for PFOA.

DOI 10.1039/c5ra26114g
Citations Scopus - 5Web of Science - 4
Co-authors Cheng Fang, Ravi Naidu
2016 Ramadass K, Palanisami T, Smith E, Mayilswami S, Megharaj M, Naidu R, 'Earthworm Comet Assay for Assessing the Risk of Weathered Petroleum Hydrocarbon Contaminated Soils: Need to Look Further than Target Contaminants', Archives of Environmental Contamination and Toxicology, 71 561-571 (2016) [C1]
DOI 10.1007/s00244-016-0318-0
Co-authors Thava Palanisami, Ravi Naidu
2016 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Sensitivity and Antioxidant Response of Chlorella sp. MM3 to Used Engine Oil and Its Water Accommodated Fraction', Bulletin of Environmental Contamination and Toxicology, 97 71-77 (2016) [C1]

© 2016, Springer Science+Business Media New York. We exposed the microalgal strain, Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) ... [more]

© 2016, Springer Science+Business Media New York. We exposed the microalgal strain, Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) to determine growth inhibition and response of antioxidant enzymes. Oil type and oil concentration greatly affected the microalgal growth. Used oil at 0.04¿% (0.4¿g L -1 ) resulted in 50¿% inhibition in algal growth, measured in terms of chlorophyll-a, while the corresponding concentration of unused oil was nontoxic. Similarly, used oil WAF showed significant toxicity to the algal growth at 10¿% level, whereas WAF from unused oil was nontoxic even at 100¿% concentration. Peroxidase enzyme in the microalga significantly increased with used oil at concentrations above 0.04¿g L -1 whereas the induction of superoxide dismutase and catalase was apparent only at 0.06¿g L -1 . Activities of the antioxidant enzymes increased significantly when the microalga was exposed to 75 and 100¿% WAF obtained from used oil. The used oil toxicity on microalga could be due to the presence of toxic soluble mono- and polyaromatic compounds, heavy metals, and other compounds attained by the oil during its use in the motor engines.

DOI 10.1007/s00128-016-1817-4
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu
2016 Subramaniyam V, Subashchandrabose SR, Ganeshkumar V, Thavamani P, Chen Z, Naidu R, Megharaj M, 'Cultivation of Chlorella on brewery wastewater and nano-particle biosynthesis by its biomass', BIORESOURCE TECHNOLOGY, 211 698-703 (2016) [C1]
DOI 10.1016/j.biortech.2016.03.154
Citations Scopus - 4Web of Science - 4
Co-authors Thava Palanisami, Zuliang Chen, Suresh Subashchandrabose, Ravi Naidu
2016 Panneerselvan L, Sivaram AK, Mallavarapu M, Naidu R, 'Evaluation of cyto- and genotoxic effects of Class B firefighting foam products: Tridol-S 3% AFFF and Tridol-S 6% AFFF to Allium cepa', Environmental Technology and Innovation, 6 185-194 (2016) [C1]

© 2016 Worldwide a multitude of firefighting compounds are currently used for the mitigation and protection of man-made structures and forests alike from fire damages. Among the ... [more]

© 2016 Worldwide a multitude of firefighting compounds are currently used for the mitigation and protection of man-made structures and forests alike from fire damages. Among the class of firefighting agents, Class B firefighting foams are generally used to control fires generated from hydrocarbon liquids. In the present study, we assessed the cyto- and genotoxicity of two widely used class B firefighting foam concentrates, Tridol-S 3% and Tridol-S 6% to Alliumcepa through chromosomal aberration and comet assay using root meristem cells. A. cepa root tips were exposed to Tridol-S 3% and Tridol-S 6% with six different concentrations (0%, 0.005%, 0.01%, 0.02%, 0.03%, 0.04% and 0.05%) for 24 h. Cytogenetic effect endpoints such as mitotic index, and chromosomal aberrations were observed. Chromosomal aberrations in the control (untreated onion root tips) was negligible with the mitotic index (MI) value of 79.6%, while the MI significantly decreased in all the test concentrations of firefighting compounds. Genotoxicity assessment through comet assay also revealed that both the products were genotoxic with a significant increase in per cent tail DNA and olive tail moment. Among the test compounds, Tridol-S 3% was more toxic than Tridol-S 6%. To our knowledge, this is the first study on the cyto- and genotoxic effects of class B firefighting foams to A. cepa root meristem cells. This study also suggests that the toxicological studies using A. cepa root meristem cells can be employed for evaluating the toxicological impacts of firefighting foams in the environment.

DOI 10.1016/j.eti.2016.10.003
Co-authors Ravi Naidu, Logeshwaran Panneerselvan
2016 Mahbub KR, Krishnan K, Naidu R, Megharaj M, 'Mercury resistance and volatilization by Pseudoxanthomonas sp. SE1 isolated from soil', Environmental Technology and Innovation, 6 94-104 (2016) [C1]

© 2016 Elsevier B.V. A mercury resistant bacterial strain SE1 isolated from contaminated soil was identified as Pseudoxanthomonas based on 16s rRNA sequencing. The Hg resistance ... [more]

© 2016 Elsevier B.V. A mercury resistant bacterial strain SE1 isolated from contaminated soil was identified as Pseudoxanthomonas based on 16s rRNA sequencing. The Hg resistance was examined in both nutrient-rich media as well as low nutrient media and expressed as EC 50 and MIC values. Estimated EC 50 and MIC values in nutrient-rich media and low nutrient media had the following respective recordings ¿ 22.6 mg L -1 ; 23.1 mg L -1 and 1.4 mg L -1 and 1.7 mg L -1 . The isolate was able to volatilize inorganic mercury demonstrated by a modified photographic film experiment and subsequently revealed its ability to remove mercury from the solution. The ICP-QQQ-MS analysis of SE1 inoculated solution showed almost 60% of 1.5 mg L -1 mercury was volatilized in 6 h and almost 40% were accumulated in cell pellets. The mercuric reductase gene merA was identified in the genome of isolate SE1 and sequenced. The deduced amino acid sequence of merA gene indicated a sequence homology with different organisms from the alpha proteobacteria group and eukaryotic fungi. merA encoded enzyme mercuric reductase activity was evident in the crude protein of the isolate. The isolate's ability to resist Hg, it's Hg volatilization potential and the presence of merA gene and mercuric reductase enzyme demonstrates the potential application of this strain in mercury bioremediation.

DOI 10.1016/j.eti.2016.08.001
Citations Scopus - 4
Co-authors Ravi Naidu, Kannan Krishnan
2016 Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Isolation and characterization of polycyclic aromatic hydrocarbons (PAHs) degrading, pH tolerant, N-fixing and P-solubilizing novel bacteria from manufactured gas plant (MGP) site soils', Environmental Technology and Innovation, 6 204-219 (2016) [C1]

© 2016 Elsevier B.V. Dearth of high molecular weight contaminant degradation, pH tolerance and growth limiting nutrient assimilation potentials of the selected microorganisms are... [more]

© 2016 Elsevier B.V. Dearth of high molecular weight contaminant degradation, pH tolerance and growth limiting nutrient assimilation potentials of the selected microorganisms are some of the prime factors reasonable for the failures in field-scale bioremediation of PAHs contaminated soils. Hence an effort was made in this study for the first time to identify HMW PAHs degrading, N-fixing and P-solubilizing bacteria with pH tolerance from long-term manufactured gas plant site soils. Four distinct strains that could degrade both LMW and HMW PAHs were identified. Among the isolates, Stenotrophomonas (MTS-2) followed by Citrobacter (MTS-3) and Pseudomonas (MTS-1) were furthermost effective in the degradation of HMW PAHs either as individual or in the presence of co-substrate (LMW PAHs). MTS-1, 2 and 3 (co)degraded model LMW PAHs, Phe (100% of 150 mg L -1 ) and HMW PAHs Pyr (100% of 150 mg L -1 ) or BaP (90¿100% of 50 mg L -1 ) in 3, 12¿15 and 30 days, respectively and recorded the least half-life time (t 1/2 ) and highest biodegradation rate constants (k). One of the significant findings is the diazotrophic P-solubilization ability, acid and alkali tolerance (optimum pH=5.0¿8.0) of the HMW PAHs degrading Pseudomonas strain MTS-1. Stenotrophomonas (MTS-2) was also found to be superior as it could solubilize P and tolerate acidic condition (optimum pH=5.0¿7.5) during HMW PAHs degradation. Further, our study is the first evidence of diazotrophic P solubilization potential of Agrobacterium (MTS-4) and P-solubilizing capacity of Citrobacter (MTS-3) during bioremediation. Thus, the results of this study demonstrate the promising use of the newly identified PAH degraders, notably MTS-1, 2 and 3 either as individuals or as consortia as an excellent candidate in the bioremediation or phytoremediation of PAHs contaminated soils.

DOI 10.1016/j.eti.2016.04.006
Citations Scopus - 3
Co-authors Ravi Naidu, Thava Palanisami
2016 Liu C, Subashchandrabose S, Ming H, Xiao B, Naidu R, Megharaj M, 'Phycoremediation of dairy and winery wastewater using Diplosphaera sp. MM1', Journal of Applied Phycology, 28 3331-3341 (2016) [C1]

© 2016, Springer Science+Business Media Dordrecht. A new green microalgal species was isolated, identified and investigated for its biomass production and nutrient removal effici... [more]

© 2016, Springer Science+Business Media Dordrecht. A new green microalgal species was isolated, identified and investigated for its biomass production and nutrient removal efficiency in dairy and winery wastewater in this study. The 18S rRNA-based phylogenetic analysis revealed that this new strain is a Diplosphaera sp. and was designated strain MM1. The growth of this strain was evaluated in different diluted dairy and winery wastewaters. The highest algal biomass production (up to 2.3¿g¿L -1 ) was obtained in dairy wastewater (D3; dairy wastewater 1:2 deionised water) after 14¿days of culture. However, for winery wastewater, the highest algal biomass production (up to 1.46¿g¿L -1 ) was obtained in wastewater combination W2 (winery wastewater 1:1 deionised water) after 14¿days of culture. Turbid dairy wastewater with high concentration of nitrogen and phosphorous slowed down the initial growth of the alga. However, at the end of day 14, biomass production was nearly twofold higher than that of winery wastewater. The findings from both types of wastewater suggest that Diplosphaera sp. MM1 has potential for its application in generating biomass with simultaneous remediation of nutrient-rich wastewater.

DOI 10.1007/s10811-016-0894-4
Citations Scopus - 2Web of Science - 1
Co-authors Ravi Naidu, Suresh Subashchandrabose
2016 Abbasian F, Lockington R, Megharaj M, Naidu R, 'Identification of a new operon involved in desulfurization of dibenzothiophenes using a metagenomic study and cloning and functional analysis of the genes', Enzyme and Microbial Technology, 87-88 24-28 (2016) [C1]

© 2016 Elsevier Inc. The presence of sulphur-substituted hydrocarbons in fossil fuels are one of main reasons for the release of sulfur oxides into the environment. Dibenzothioph... [more]

© 2016 Elsevier Inc. The presence of sulphur-substituted hydrocarbons in fossil fuels are one of main reasons for the release of sulfur oxides into the environment. Dibenzothiophenes (DBT) are organic sulfur-containing molecules in crude oil, which have the potential for biological oxidation, with the sulphur being removed through an enzymatic cleavage of the C. S bonds. Therefore, finding new strains that can desulfurize this compound has recently become a point of interest. In this study, three new genes involved in the bacterial desulfurization of Dibenzothiophene, which were sequenced in the course of a metagenomic study, were isolated by PCR amplification in the laboratory. The activities of these genes were then analysed following insertion into an expression vector and cloning in Escherichia coli DH5a cells. Based on the results, all three genes were actively expressed and their products could act on their corresponding substrates.

DOI 10.1016/j.enzmictec.2016.02.009
Citations Scopus - 2Web of Science - 2
Co-authors Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Potential of Melaleuca diosmifolia leaf as a low-cost adsorbent for hexavalent chromium removal from contaminated water bodies', Process Safety and Environmental Protection, 100 173-182 (2016) [C1]

© 2016 The Institution of Chemical Engineers. The present study describes for the first time the utilization of dried twigs of Melaleuca diosmifolia, fallen off from the plant, t... [more]

© 2016 The Institution of Chemical Engineers. The present study describes for the first time the utilization of dried twigs of Melaleuca diosmifolia, fallen off from the plant, to detoxify and remove hexavalent chromium or Cr(VI) from aqueous systems. Initial characterization by gas chromatography revealed that the selected biomaterial is one of the natural sources of eucalyptol. It constituted high concentrations of reducing compounds (iron, phenols and flavonoids). Batch studies revealed that the biosorbent (5 g L -1 ) was able to remove 97-99.9% of 250 mg L -1 Cr(VI) at wide-ranging pH (2-10) and temperature (24-48 °C). Adsorption kinetics was well described using the pseudo-second-order kinetic model, while the equilibrium adsorption data were interpreted in terms of the Langmuir isotherm model. The monolayer adsorption capacity was 62.5 mg g -1 . Both inductively coupled plasma optical emission spectrometry and liquid chromatography analyses of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal was 'adsorption-coupled reduction'. Scanning electron microscope, infrared spectroscopy and X-ray diffraction analyses of the biosorbent before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to Cr(III) followed by complexation onto functional groups of the active surface contributed to the removal of Cr(VI) from aqueous solution. The selected biomaterial effectively (99.9%) removed Cr(VI) in lake and sea water samples, highlighting its potential for remediating Cr(VI) in real environmental conditions.

DOI 10.1016/j.psep.2016.01.009
Citations Scopus - 12Web of Science - 11
Co-authors Thava Palanisami, Ravi Naidu
2016 Abbasi S, Lamb DT, Palanisami T, Kader M, Matanitobua V, Megharaj M, Naidu R, 'Bioaccessibility of barium from barite contaminated soils based on gastric phase in vitro data and plant uptake', Chemosphere, 144 1421-1427 (2016) [C1]

© 2015 Elsevier Ltd. Barite contamination of soil commonly occurs from either barite mining or explorative drilling operations. This work reported in vitro data for barite contam... [more]

© 2015 Elsevier Ltd. Barite contamination of soil commonly occurs from either barite mining or explorative drilling operations. This work reported in vitro data for barite contaminated soils using the physiologically based extraction test (PBET) methodology. The existence of barite in plant tissue and the possibility of 'biomineralised' zones was also investigated using Scanning Electron Microscopy. Soils with low barium (Ba) concentrations showed a higher proportion of Ba extractability than barite rich samples. Barium uptake to spinach from soil was different between short term spiking studies and field weathered soils. Furthermore, Ba crystals were not evident in spinach tissue or acid digest solutions grown in barium nitrate spiked soils despite high accumulation. Barite was found in the plant digest solutions from barite contaminated soils only. Results indicate that under the conservative assumptions made, a child would need to consume extreme quantities of soil over an extended period to cause chronic health problems.

DOI 10.1016/j.chemosphere.2015.10.031
Citations Scopus - 1Web of Science - 2
Co-authors Thava Palanisami, Ravi Naidu, Dane Lamb
2016 Xia Q, Peng C, Lamb D, Mallavarapu M, Naidu R, Ng JC, 'Bioaccessibility of arsenic and cadmium assessed for in vitro bioaccessibility in spiked soils and their interaction during the Unified BARGE Method (UBM) extraction', Chemosphere, 147 444-450 (2016) [C1]

© 2015 Elsevier Ltd. Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the ex... [more]

© 2015 Elsevier Ltd. Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the existin g bioaccessibility studies only focus on single contaminant. Considering human are likely to ingest multi-contaminants, these contaminants could interact within human gastrointestinal tract which may lead to an increase or decrease in bioaccessibility. In this study, seven different types of soil were spiked with arsenic (As) or cadmium (Cd) and aged for one year. The effects of soil properties on the bioaccessibility were examined. Moreover, the interaction between As and Cd in simulated human digestive system was studied by mixing As-spiked soil with Cd-spiked soil of the same type during bioaccessibility test. Results shows the bioaccessibility of As ranged from 40 ± 2.8 to 95 ± 1.3% in the gastric phase and 16 ± 2.0 to 96 ± 0.8% in the intestinal phase whilst a significant difference was observed between Cd gastric bioaccessibility (72 ± 4.3 to 99 ± 0.8%) and intestinal bioaccessibility (6.2 ± 0.3 to 45 ± 2.7%). Organic carbon, iron oxide and aluminium oxide were key parameters influencing the bioaccessibility of As (gastric and intestinal phases) and Cd (intestinal phase). No interactions between As and Cd during bioaccessibility test were observed in any soils, which indicates As and Cd may age independently and did not interact while being solubilised during bioaccessibility test. Thus additive effect may be proposed when estimating the bioaccessibility of mixtures of independently-aged As and Cd in soils.

DOI 10.1016/j.chemosphere.2015.12.091
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu, Dane Lamb
2016 Ramakrishnan P, Nagarajan S, Thiruvenkatam V, Palanisami T, Naidu R, Mallavarapu M, Rajendran S, 'Cation doped hydroxyapatite nanoparticles enhance strontium adsorption from aqueous system: A comparative study with and without calcination', APPLIED CLAY SCIENCE, 134 136-144 (2016) [C1]
DOI 10.1016/j.clay.2016.09.022
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Thava Palanisami
2016 Nirola R, Megharaj M, Beecham S, Aryal R, Thavamani P, Vankateswarlu K, Saint C, 'Remediation of metalliferous mines, revegetation challenges and emerging prospects in semi-arid and arid conditions', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 20131-20150 (2016) [C1]
DOI 10.1007/s11356-016-7372-z
Citations Scopus - 1Web of Science - 1
Co-authors Thava Palanisami
2016 Prasath A, Panneerselvan L, Provatas A, Naidu R, Megharaj M, 'Genotoxicity assessment of acute exposure of 2, 4-dinitroanisole, its metabolites and 2, 4, 6-trinitrotoluene to Daphnia carinata', ECOTOXICOLOGY, 25 1873-1879 (2016) [C1]
DOI 10.1007/s10646-016-1709-8
Co-authors Logeshwaran Panneerselvan, Ravi Naidu, Prasath Annamalai
2016 Nookongbut P, Kantachote D, Megharaj M, 'Arsenic contamination in areas surrounding mines and selection of potential As-resistant purple nonsulfur bacteria for use in bioremediation based on their detoxification mechanisms', ANNALS OF MICROBIOLOGY, 66 1419-1429 (2016) [C1]
DOI 10.1007/s13213-016-1229-z
Citations Scopus - 3Web of Science - 2
2016 Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Predicting copper phytotoxicity based on pore-water pCu', ECOTOXICOLOGY, 25 481-490 (2016) [C1]
DOI 10.1007/s10646-015-1605-7
Citations Scopus - 6Web of Science - 2
Co-authors Liang Wang, Dane Lamb, Ravi Naidu
2016 Xia Q, Peng C, Lamb D, Kader M, Mallavarapu M, Naidu R, Ng JC, 'Effects of arsenic and cadmium on bioaccessibility of lead in spiked soils assessed by Unified BARGE Method', CHEMOSPHERE, 154 343-349 (2016) [C1]
DOI 10.1016/j.chemosphere.2016.03.133
Citations Scopus - 3Web of Science - 2
Co-authors Dane Lamb, Ravi Naidu
2016 Kader M, Lamb DT, Mahbub KR, Megharaj M, Naidu R, 'Predicting plant uptake and toxicity of lead (Pb) in long-term contaminated soils from derived transfer functions', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 23 15460-15470 (2016) [C1]
DOI 10.1007/s11356-016-6696-z
Citations Scopus - 5Web of Science - 4
Co-authors Dane Lamb, Ravi Naidu
2016 Mayilswami S, Krishnan K, Naidu R, Megharaj M, 'Transcriptome analysis of Eisenia fetida chronically exposed to benzo(a)pyrene', Environmental Technology & Innovation, (2016)
Co-authors Ravi Naidu, Kannan Krishnan
2016 Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Kinetics of PAH degradation by a new acid-metal-tolerant Trabulsiella isolated from the MGP site soil and identification of its potential to fix nitrogen and solubilize phosphorous', JOURNAL OF HAZARDOUS MATERIALS, 307 99-107 (2016) [C1]
DOI 10.1016/j.jhazmat.2015.12.068
Citations Scopus - 7Web of Science - 5
Co-authors Ravi Naidu, Thava Palanisami
2016 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Soil bacterial strains with heavy metal resistance and high potential in degrading diesel oil and n-alkanes', International Journal of Environmental Science and Technology, 13 2863-2874 (2016) [C1]

© 2016, Islamic Azad University (IAU). Four bacterial strains, capable of degrading diesel oil, n-alkanes or hexadecane, were isolated from soils contaminated with petroleum oil ... [more]

© 2016, Islamic Azad University (IAU). Four bacterial strains, capable of degrading diesel oil, n-alkanes or hexadecane, were isolated from soils contaminated with petroleum oil and identified. Strains of Pseudomonas sp., Pseudomonas putida TPHK-1 and Pseudomonas aeruginosa TPHK-4, were more efficient in degrading high concentrations of the hydrocarbons than the other two strains, Stenotrophomonas maltophilia TPHK-2 and Acenitobacter sp. TPHK-3. P. putida TPHK-1 exhibited tolerance to very high concentrations of heavy metals such as cadmium, lead, zinc and copper. The innate ability of P. putida TPHK-1, as evidenced by the amplified genes alkB1 and alkB2 that encode alkane hydroxylases, and cat12o and cat23o coding for catechol dioxygenase, in degrading diesel oil in the presence of heavy metals is far greater than that of the strains reported in the literature. Heavy metal tolerance coupled with rapid degradation of hydrocarbons, even at high concentrations, suggests that P. putida TPHK-1 has a great potential in remediating soils contaminated with mixtures of hydrocarbons and heavy metals.

DOI 10.1007/s13762-016-1113-1
Citations Scopus - 1
Co-authors Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Lee YB, Naidu R, 'Polyaromatic hydrocarbon (PAH) degradation potential of a new acid tolerant, diazotrophic P-solubilizing and heavy metal resistant bacterium Cupriavidus sp. MTS-7 isolated from long-term mixed contaminated soil', Chemosphere, 162 31-39 (2016) [C1]

© 2016 Elsevier Ltd An isolate of Cupriavidus (strain MTS-7) was identified from a long-term PAHs and heavy metals mixed contaminated soil with the potential to biodegrade both L... [more]

© 2016 Elsevier Ltd An isolate of Cupriavidus (strain MTS-7) was identified from a long-term PAHs and heavy metals mixed contaminated soil with the potential to biodegrade both LMW and HMW PAHs with added unique traits of acid and alkali tolerance, heavy metal tolerance, self-nutrient assimilation by N fixation and P solubilization. This strain completely degraded the model 3 (150¿mg¿L -1 Phe), 4 (150¿mg¿L -1 Pyr) and 5 (50¿mg¿L -1 BaP) ring PAHs in 4, 20 and 30 days, respectively. It could mineralize 90¿100% of PAHs (200¿mg¿L -1 of Phe and Pyr) within 15 days across pH ranging from 5 to 8 and even in the presence of toxic metal contaminations. During biodegradation, the minimum inhibitory concentrations were 5 (Cu 2+ ) and 3 (Cd 2+ , Pb 2+ , Zn 2+ ) mg L -1 of the potentially bioavailable metal ions and over 17¿mg¿L -1 metal levels was lethal for the microbe. Further, it could fix 217¿274¿µg¿mL -1 of N and solubilize 79¿135¿µg¿mL -1 of P while PAHs degradation. MTS-7 as a superior candidate could be thus used in the enhanced bioaugmentation and/or phytoremediation of long-term mixed contaminated sites.

DOI 10.1016/j.chemosphere.2016.07.052
Citations Scopus - 3Web of Science - 2
Co-authors Thava Palanisami, Ravi Naidu
2016 Fang C, Chen Z, Megharaj M, Naidu R, 'Potentiometric detection of AFFFs based on MIP', Environmental Technology & Innovation, 5 52-59 (2016) [C1]
DOI 10.1016/j.eti.2015.12.003
Co-authors Cheng Fang, Zuliang Chen, Ravi Naidu
2016 Nirola R, Megharaj M, Aryal R, Thavamani P, Ramdass K, Sarkar B, Saint C, 'Stress responses and specific metal exclusion on mine soils based on germination and growth studies by Australian golden wattle', Ecological Indicators, 71 113-122 (2016) [C1]

© 2016 Elsevier Ltd We reported the Australian golden wattle as a copper stabilizer in abandoned copper mine soils earlier. Here we investigate to confirm this plant&apos;s suita... [more]

© 2016 Elsevier Ltd We reported the Australian golden wattle as a copper stabilizer in abandoned copper mine soils earlier. Here we investigate to confirm this plant's suitability to grow on metal contaminated mine soils based on stress indication. The seeds of Acacia pycnantha collected from mining area were germinated after heat and no heat treatment on two types of irrigation. The daily irrigated and heat treated seeds gave up to 85% germination on sandy soil. The A. pycnantha was grown under greenhouse condition in six different soils collected from abandoned copper mine at Kapunda in South Australia. Among the six soil samples, soil-1 with the highest copper concentration produced 2.05 mmol g -1 tissue of proline. Proline expression was prominent in more saline soils (1, 5 and 6) having electrical conductivity (EC) 1184, 1364 and 1256 µS, respectively. Chlorophyll a, b and carotenoid levels in plants showed a gradually decreasing trend in all the soils as experiment progressed. The plants grown on soil sample-1, containing 4083 ± 103 mg kg -1 of copper resulted in 18 ± 2 mg kg -1 accumulation in its leaf. The calcium accumulation was significant up to 11648 ± 1209 mg kg -1 in leaf. Although pore water samples showed higher Cu concentration in soils, an increased mobility of arsenic and lead was observed in all the soil samples. Our experiment points out the need for proper monitoring of revegetation processes to avoid revegetation and reclamation failure.

DOI 10.1016/j.ecolind.2016.06.062
Co-authors Thava Palanisami
2016 Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Reduction of hexavalent chromium by green synthesized nano zero valent iron and process optimization using response surface methodology', Environmental Technology & Innovation, 5 136-147 (2016) [C1]
DOI 10.1016/j.eti.2016.01.005
Co-authors Zuliang Chen, Ravi Naidu
2016 He W, Megharaj M, Naidu R, 'Toxicity of perfluorooctanoic acid towards earthworm and enzymatic activities in soil', Environmental Monitoring and Assessment, 188 (2016) [C1]

© 2016, Springer International Publishing Switzerland. Perfluorooctanoic acid (PFOA) is a widespread persistent organic contaminant in the environment that has recently raised mu... [more]

© 2016, Springer International Publishing Switzerland. Perfluorooctanoic acid (PFOA) is a widespread persistent organic contaminant in the environment that has recently raised much of regulatory and public concern. Therefore, assessment of its ecological risk is a top priority research. Hence, this study investigated the toxicity of PFOA to beneficial microbial processes in the soil such as activities of dehydrogenase, urease and potential nitrification in addition to earthworm survival, weight loss and PFOA bioaccumulation in two contrasting soils. In general, PFOA caused inhibition of all the measured microbial processes in a dose-dependent manner and the inhibition was higher in Williamtown (WT) soil than Edinburgh (EB) soil. Thus, WT soil being sandy in nature with low clay content showed higher PFOA bioavailability and hence showed higher toxicity. There was no mortality in earthworms exposed up to 100¿mg PFOA/kilogram soil in both the soils; however, there was a significant weight loss from 25¿mg/kg onwards. This study clearly demonstrates that soil contamination of PFOA can lead to adverse effects on soil health.

DOI 10.1007/s10661-016-5416-y
Citations Scopus - 2Web of Science - 2
Co-authors Ravi Naidu
2016 Abbasian F, Lockington R, Megharaj M, Naidu R, 'The Biodiversity Changes in the Microbial Population of Soils Contaminated with Crude Oil', Current Microbiology, 72 663-670 (2016) [C1]

© 2016, Springer Science+Business Media New York. Crude oil spills resulting from excavation, transportation and downstream processes can cause intensive damage to living organis... [more]

© 2016, Springer Science+Business Media New York. Crude oil spills resulting from excavation, transportation and downstream processes can cause intensive damage to living organisms and result in changes in the microbial population of that environment. In this study, we used a pyrosequencing analysis to investigate changes in the microbial population of soils contaminated with crude oil. Crude oil contamination in soil resulted in the creation of a more homogenous population of microorganisms dominated by members of the Actinomycetales, Clostridiales and Bacillales (all belonging to Gram-positive bacteria) as well as Flavobacteriales, Pseudomonadales, Burkholderiales, Rhizobiales and Sphingomonadales (all belonging to Gram-negative bacteria). These changes in the biodiversity decreased the ratios of chemoheterotrophic bacteria at higher concentrations of crude oil contamination, with these being replaced by photoheterotrophic bacteria, mainly Rhodospirillales. Several of the dominant microbial orders in the crude oil contaminated soils are able to degrade crude oil hydrocarbons and therefore are potentially useful for remediation of crude oil in contaminated sites.

DOI 10.1007/s00284-016-1001-4
Citations Scopus - 6Web of Science - 5
Co-authors Ravi Naidu
2016 Duan L, Naidu R, Liu Y, Dong Z, Mallavarapu M, Herde P, et al., 'Comparison of oral bioavailability of benzo[a]pyrene in soils using rat and swine and the implications for human health risk assessment', Environment International, 94 95-102 (2016) [C1]

© 2016 Elsevier Ltd. Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a] P) soil guidelines protecting human health based on carcinogenic data ... [more]

© 2016 Elsevier Ltd. Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a] P) soil guidelines protecting human health based on carcinogenic data obtained in animal studies. Although swine is recognised as being much more representative of the human child in terms of body size, gut physiology and genetic profile the rat/mice model is commonly used in practice. Objectives: We compare B[a]P bioavailability using a rat model to that estimated in a swine model, to investigate the correlation between these two animal models. This may help reduce uncertainty in applying bioavailability to human health risk assessment. Methods: Twelve spiked soil samples and a spiked silica sand (reference material) were dosed to rats in parallel with a swine study. B[a] P bioavailability was estimated by the area under the plasma B[a]P concentration-time curve (AUC) and faecal excretion as well in the rats. Direct comparison between the two animal models was made for: firstly, relative bioavailability (RB) using AUC assay; and secondly, the two assays in the rat model. Results: Both AUC and faecal excretion assays showed linear dose-response for the reference material. However, absolute bioavailability was significantly higher when using faecal excretion assay (p < 0.001). In aged soils faecal excretion estimated based on solvent extraction was not accurate due to the form of non-extractable fraction through ageing. A significant correlation existed between the two models using RB for soil samples (RB rat = 0.26RB swine + 17.3, R 2 = 0.70, p < 0.001), despite the regression slope coefficient revealing that the rat model would underestimate RB by about one quarter compared to using swine. Conclusions: In the comparison employed in this study, an interspecies difference of four in RB using AUC assay was identified between the rat and swine models regarding pharmacokinetic differences, which supported the body weight scaling method recommended by US EPA. Future research should focus on the carcinogenic competency (pharmacodynamics) used in experiment animals and humans.

DOI 10.1016/j.envint.2016.04.041
Citations Scopus - 3Web of Science - 3
Co-authors Morrow Dong, Ravi Naidu, Luchun Duan, Yanju Liu
2016 Wang L, Fang C, Cheng Y, Lamb D, Chen Z, Megharaj M, Naidu R, 'A practical way to make solid-state reference electrodes', Journal of Bioanalytical Techniques, 1 1-5 (2016)
DOI 10.16966/jbt.101
Co-authors Ravi Naidu, Dane Lamb, Liang Wang, Zuliang Chen, Cheng Fang
2016 Nirola R, Megharaj M, Venkateswarlu K, Aryal R, Correll R, Naidu R, 'Assessment of metal toxicity and bioavailability in metallophyte leaf litters and metalliferous soils using Eisenia fetida in a microcosm study', Ecotoxicology and Environmental Safety, 129 264-272 (2016) [C1]

© 2016 Elsevier Inc. The leaf litters of tree species, Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec), predominantly growing at an abandoned copper (Cu) mine and mine so... [more]

© 2016 Elsevier Inc. The leaf litters of tree species, Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec), predominantly growing at an abandoned copper (Cu) mine and mine soils including controls, were assessed for determining the metal toxicity and bioavailability using earthworm species Eisenia fetida, in a microcosm. Significant reduction in body weight as well as mortality were observed when the worms were introduced into mine soil or its combination with mine Ap litter. Virtually, there were no juveniles when the worms were fed on substratum that contained mine soil or mine leaf litter. The extent of bioaccumulation was dependent on water-soluble fraction of a metal in soil. The accumulation of cadmium, lead and copper in worm tissue was significantly more in treatments that received mine soil with or without mine leaf litter. However, the tissue concentration of zinc did not differ much in earthworms irrespective of its exposure to control or contaminated samples. Mine leaf litter from Ec, a known Cu hyperaccumulator, was more hospitable to earthworm survival and juvenile than that of Ap litter. Validation of the data on bioaccumulation of metals indicated that the mine leaf litter significantly contributed to metal bioavailability. However, it was primarily the metal concentration in mine soil that was responsible for earthworm toxicity and bioavailability. Our data also indicate that detrivores like earthworm is greatly responsible for heavy metal transfer from mines into the ecosystem.

DOI 10.1016/j.ecoenv.2016.03.034
Citations Scopus - 3Web of Science - 2
Co-authors Ravi Naidu
2016 Bahar MM, Megharaj M, Naidu R, 'Influence of phosphate on toxicity and bioaccumulation of arsenic in a soil isolate of microalga Chlorella sp.', Environmental Science and Pollution Research, 23 2663-2668 (2016) [C1]

© 2015, Springer-Verlag Berlin Heidelberg. In this study, the toxicity, biotransformation and bioaccumulation of arsenite and arsenate in a soil microalga, Chlorella sp., were in... [more]

© 2015, Springer-Verlag Berlin Heidelberg. In this study, the toxicity, biotransformation and bioaccumulation of arsenite and arsenate in a soil microalga, Chlorella sp., were investigated using different phosphate levels. The results indicated that arsenate was highly toxic than arsenite to the alga, and the phosphate limitation in growth media greatly enhanced arsenate toxicity. The uptake of arsenate in algal cells was more than that of arsenite, and the predominant species in the growth media was arsenate after 8¿days of exposure to arsenite or arsenate, indicating arsenite oxidation by this microalga. Arsenate reduction was also observed when the alga was incubated in a phosphate-limiting growth medium. Similar to the process of biotransformation, the alga accumulated more arsenic when it was exposed to arsenate and preferably more in a phosphate-limiting condition. Although phosphate significantly influences the biotransformation and bioaccumulation of arsenic, the oxidizing ability and higher accumulation capacity of this alga have great potential for its application in arsenic bioremediation.

DOI 10.1007/s11356-015-5510-7
Citations Scopus - 10Web of Science - 9
Co-authors Ravi Naidu, Mezbaul Bahar
2016 Wang L, Cheng Y, Lamb D, Chen Z, Lesniewski P, Mallavarapu M, Naidu R, 'Simultaneously determining multi-metal ions using an Ion Selective Electrode array system', Environmental Technology & Innovation, 6 165-176 (2016) [C1]
DOI 10.1016/j.eti.2016.10.001
Co-authors Dane Lamb, Liang Wang, Zuliang Chen, Ravi Naidu
2016 Lamb DT, Kader M, Ming H, Wang L, Abbasi S, Megharaj M, Naidu R, 'Predicting plant uptake of cadmium: validated with long-term contaminated soils', ECOTOXICOLOGY, 25 1563-1574 (2016) [C1]
DOI 10.1007/s10646-016-1712-0
Citations Scopus - 2Web of Science - 2
Co-authors Liang Wang, Dane Lamb, Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Naidu R, 'Agronomic and remedial benefits and risks of applying biochar to soil: Current knowledge and future research directions', Environment International, 87 1-12 (2016) [C1]

© 2015 Elsevier Ltd. &apos;Biochar&apos; represents an emerging technology that is increasingly being recognized for its potential role in carbon sequestration, reducing greenhou... [more]

© 2015 Elsevier Ltd. 'Biochar' represents an emerging technology that is increasingly being recognized for its potential role in carbon sequestration, reducing greenhouse gas emissions, waste management, renewable energy, soil improvement, crop productivity enhancement and environmental remediation. Published reviews have so far focused mainly on the above listed agronomic and environmental benefits of applying biochar, yet paid little or no attention to its harmful effects on the ecological system. This review highlights a balanced overview of the advantages and disadvantages of the pyrolysis process of biochar production, end-product quality and the benefits versus drawbacks of biochar on: (a) soil geochemistry and albedo, (b) microflora and fauna, (c) agrochemicals, (d) greenhouse gas efflux, (e) nutrients, (f) crop yield, and (g) contaminants (organic and inorganic). Future research should focus more on the unintended long-term consequences of biochar on biological organisms and their processes in the soil.

DOI 10.1016/j.envint.2015.10.018
Citations Scopus - 36Web of Science - 30
Co-authors Thava Palanisami, Ravi Naidu
2016 Kader M, Lamb DT, Megharaj M, Naidu R, 'Sorption parameters as a predictor of arsenic phytotoxicity in Australian soils', Geoderma, 265 103-110 (2016) [C1]

© 2015 Elsevier B.V. Arsenic (As) is a mobile and ecotoxic metalloid that is of serious concern to the environment. In this study, As phytotoxicity was studied using a dose-respo... [more]

© 2015 Elsevier B.V. Arsenic (As) is a mobile and ecotoxic metalloid that is of serious concern to the environment. In this study, As phytotoxicity was studied using a dose-response approach for seven contrasting soils considering 3 end-points (shoot biomass, root elongation and chlorophyll content) and focusing on predictors of toxicity. Root elongation study was carried out for 4days using both Cucumis sativus L. (cucumber) and Triticum aestivum L. (wheat) and shoot end-points with a 4week a pot study using cucumber only. Root elongation of cucumber was a substantially less sensitive indicator to As than data from the 4weeks pot study. Effective concentrations (50%)(EC 50 ) from cucumber root elongation studies were overall 1.6 times higher than the 4week shoot data. Cucumber was however considerably more sensitive to wheat. Given the large discrepancy in phytotoxicity end points for 7 soils, root elongation data for ecotoxicological assessment should be treated with some caution. Arsenic phytotoxicity was strongly related to the sorption constants of each of the seven soils in our study. Both root elongation and shoot data were related strongly to Freundlich partitioning constants (K f ) (L/kg). Wheat and cucumber root elongation had R 2 values 0.90 and 0.91 respectively, while cucumber shoot data was 0.79. The K f values were related to soil pH and also EC 50 data and, thus, shows that As phytotoxicity in our study was primarily controlled by sorption reactions. The rate of As bioaccumulation to cucumber shoots depended heavily on the soil under consideration. Chlorophyll and carotenoid content of cucumber shoots increased with As content in 3 soils and decreased in other soils.

DOI 10.1016/j.geoderma.2015.11.019
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu, Dane Lamb
2016 Ming H, Naidu R, Sarkar B, Lamb DT, Liu Y, Megharaj M, Sparks D, 'Competitive sorption of cadmium and zinc in contrasting soils', Geoderma, 268 60-68 (2016) [C1]

© 2016 Elsevier B.V. The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual ... [more]

© 2016 Elsevier B.V. The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual metal systems. In the single metal system, Zn exhibited a greater affinity for the alkaline soil, as indicated by the Langmuir constant (K L = 8.85 L/kg) compared with Cd (K L = 1.79 L/kg). However, much less sorption of both Zn (K L = 0.19 L/kg) and Cd (K L = 0.07 L/kg) was observed in the acidic soil. The competitive sorption data were modeled using two-metal Freundlich and Langmuir functions. The competition for metal sorption occurred in the alkaline soil only at a higher concentration of the competing metals, whereas the effect was significant even at lower concentrations in the acidic soil. The cumulative amount of both metals sorbed in the soil was similar to that of single metal systems in the studied concentration range, demonstrating that the number of sites available for sorption remained constant irrespective of the competition. This study indicated that Cd might be more mobile in a mixed-metal system than in a single-metal scenario and thus poses a serious ecotoxicological threat. This study is important for assessing the risks and developing management strategies for multiple heavy metal contaminated soils.

DOI 10.1016/j.geoderma.2016.01.021
Citations Scopus - 8Web of Science - 5
Co-authors Yanju Liu, Ravi Naidu, Dane Lamb
2016 Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Biodegradation of polycyclic aromatic hydrocarbons (PAHs) by novel bacterial consortia tolerant to diverse physical settings - Assessments in liquid- and slurry-phase systems', International Biodeterioration and Biodegradation, 108 149-157 (2016) [C1]

© 2015 Elsevier Ltd. Field-scale bioremediation of PAHs contaminated soils have proved to be difficult and challenging due to inhibited growth of PAH degrading microbes. In this ... [more]

© 2015 Elsevier Ltd. Field-scale bioremediation of PAHs contaminated soils have proved to be difficult and challenging due to inhibited growth of PAH degrading microbes. In this study, for the first time mixed bacterial cultures designated as consortia-A and N were developed using elite metal or acid tolerant, N-fixing, P-solubilizing and biosurfactant producing PAH degraders enriched from manufactured gas plant sites. The two consortia could degrade both LMW and HMW PAHs. Kinetic studies of PAH degradation by the consortia showed the highest biodegradation rate constants (k = 0.027-0.61 day -1 ) and lowest half-life time (t 1/2 = 1-26 days) values reported to date in liquid cultures and highlighted the use of consortium-A for the remediation of acidic soils due to its tolerance up to pH 5. Furthermore, bioaugmentation of these consortia has proven to be effective in degradation of LMW ( > 95%) and HMW (90%) PAHs from spiked soil slurries. Amendment of consortia-A and N exhibited 10.7 and 44.3% more total PAHs degradation, respectively than natural attenuation in 60 days even from the real long-term mixed contaminated soils. Thus the results of this study demonstrate the great potential of these novel bacterial consortia, particularly consortium-N for use in field-scale bioremediation of PAHs in long-term mixed contaminated neutral soils.

DOI 10.1016/j.ibiod.2015.12.013
Citations Scopus - 17Web of Science - 15
Co-authors Thava Palanisami, Ravi Naidu
2016 Kuppusamy S, Thavamani P, Megharaj M, Venkateswarlu K, Lee YB, Naidu R, 'Potential of Melaleuca diosmifolia as a novel, non-conventional and low-cost coagulating adsorbent for removing both cationic and anionic dyes', Journal of Industrial and Engineering Chemistry, 37 198-207 (2016) [C1]

© 2016 The Korean Society of Industrial and Engineering Chemistry.The potential of dried twigs of Melaleuca diosmifolia as a novel biosorbent for removing three cationic dyes, me... [more]

© 2016 The Korean Society of Industrial and Engineering Chemistry.The potential of dried twigs of Melaleuca diosmifolia as a novel biosorbent for removing three cationic dyes, methylene blue (MB), acridine orange (AO) and malachite green (MG), and an anionic dye, eriochrome black T (EB) was evaluated in a batch adsorption process. Notably, the biosorbent removed 77-99% of both cationic and anionic dyes in a wide ranging pH of 2-10, and the reactions were endothermic. The dye adsorption equilibria were rapidly attained within 3 h. The monolayer adsorption capacity of the sorbent added at 5 g L-1 was 119.05, 126.8, 116.28 and 94.34 mg g-1 for MB, AO, MG and EB, respectively. The water extract obtained from the plant material induced fast decolourization of both categories of dyes followed by gradual flocculation, indicating its potential as a natural coagulant. Gas chromatographic analysis also indicated that the main electrostatic attraction between 1,8-cineole, 1-p-methene-8-thiol and furfural compounds of the biomaterial, and dye molecules resulted in the formation of initial supramolecular complexes which further progressed into strong aggregates, leading to precipitation of dye-biomaterial complexes. Subsequently, the overall complex mechanism of dye removal was confirmed to be a combined process of adsorption and coagulation. Consistent with the batch studies, using selected plant material in real environmental water samples also resulted in effective dye removal, highlighting its potential for use in wastewater treatment.

DOI 10.1016/j.jiec.2016.03.021
Citations Scopus - 1Web of Science - 5
Co-authors Thava Palanisami, Ravi Naidu
2015 Wu Y, Zeng S, Wang F, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton-like oxidation of malachite green by iron-based nanoparticles synthesized by tea extract as a catalyst', Separation and Purification Technology, 154 161-167 (2015) [C1]

© 2015 Elsevier B.V. All rights reserved. The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of ma... [more]

© 2015 Elsevier B.V. All rights reserved. The green synthesis of functional iron nanoparticles (Fe NPs) by tea extracts was used as a catalyst for the Fenton-like oxidation of malachite green (MG), where more than 85% of MG was removed. The new findings are that the removal of MG by Fe NPs was based on the adsorption of MG onto iron oxide and degradation of MG by iron nanoparticles. This was confirmed by adsorption and degradation kinetics, indicating that: firstly, the adsorption kinetics follows the pseudo-first-order model; and secondly, degradation kinetics fitted well to the pseudo-second-order model. Morphology, size and changes in the Fe NPs surface were characterized using SEM, XRD, and FTIR techniques, showing that Fe < inf > 2 < /inf > O < inf > 3 < /inf > and Fe < inf > 3 < /inf > O < inf > 4 < /inf > was formed and green tea extract contained a high concentration of caffeine/polyphenols. It acted as both reducing and capping agents in the synthesis of Fe NPs. To further confirm the removal mechanism of MG by the functional Fe NPs, the degraded products were identified by FTIR and GC-MS analysis. Finally the mechanism of Fenton-like oxidation of MG based on both adsorption and degradation was proposed.

DOI 10.1016/j.seppur.2015.09.022
Citations Scopus - 9Web of Science - 8
Co-authors Ravi Naidu, Zuliang Chen
2015 Venkidusamy K, Megharaj M, Schröder U, Karouta F, Mohan SV, Naidu R, 'Electron transport through electrically conductive nanofilaments in Rhodopseudomonas palustris strain RP2', RSC Advances, 5 100790-100798 (2015) [C1]

© The Royal Society of Chemistry 2015. Electronic dialogue between proteins is expected to be a key component of charge transport at the microbe-mineral interface (MMI) and requi... [more]

© The Royal Society of Chemistry 2015. Electronic dialogue between proteins is expected to be a key component of charge transport at the microbe-mineral interface (MMI) and requires complex structures. Microbial nanofilaments are one such structure produced in energetically engineered environments. These nanostructures consist of natural protein electronic conduits which can target the microbe-mineral interface and facilitate charge transport over a distance. Nanofilaments are phylogenetically diverse inducible extracellular appendages, and have the potential to serve as organic electronic conductors. However, recent investigations on such microbial nanofilaments have been confined to a few bacterial genera such as Geobacter, Shewanella and Synechocystis. Here, we report the evidence for longitudinal electron transport through inducible nanofilaments produced by another genus, the metabolically versatile photosynthetic, iron(iii) respiring bacterium Rhodopseudomonas palustris strain RP2, in photic, iron(iii) oxide-rich environments. In contrast, chemosynthetic dark-grown anoxic cells are weak in their ability to reduce ferric-oxide and no longer produce extracellular structures. Independent evaluation techniques illustrate the induction of extracellular filaments and their electrical properties. Scanning probe and nanofabricated electrode measurements provide conclusive evidence for the occurrence of direct charge transfer along the length and radius of nanofilaments from strain RP2. These findings not only expand our knowledge of the range of bacteria known to produce nanofilaments but also provide further research opportunities in the field of bionanotechnology, sustainable remediation (bioelectrochemical remediation systems) in contaminated sites (petroleum hydrocarbons) and MMI process at photic environments.

DOI 10.1039/c5ra08742b
Citations Scopus - 10Web of Science - 9
Co-authors Ravi Naidu
2015 Kuppusamy S, Thavamani P, Megharaj M, Naidu R, 'Bioremediation potential of natural polyphenol rich green wastes: A review of current research and recommendations for future directions', Environmental Technology and Innovation, 4 17-28 (2015) [C1]

© 2015 Elsevier B.V. &apos;Green waste&apos; (food, agro-industrial and forest residues) is a renowned valuable resource of polyphenols. Natural polyphenols are relatively effici... [more]

© 2015 Elsevier B.V. 'Green waste' (food, agro-industrial and forest residues) is a renowned valuable resource of polyphenols. Natural polyphenols are relatively efficient in the clean-up of environmental pollutants based on their unique traits of chelation, adsorption, reduction, complexation, nutrient cycling, antibacterial effects and plant growth promotion. These significant traits have found emerging applications in the removal of heavy metals, pathogenic bacteria and dyes from contaminated soil and water through existing bioremedial techniques such as biosorption, phytoextraction and coagulation. Increasingly, polyphenol-rich natural extracts harnessed for green nanoparticle synthesis (production of particles between 1 and 100 nm in size using biological entities such as microorganisms or plant biomass) have found promising use as a remedial agent in the detoxification of toxic pollutants. However, current bioremediation approaches do not sufficiently exploit natural polyphenols, which are abundantly available and are non-toxic. This review examines the extent of natural polyphenol availability in green waste, and provides a critical view on the existing remedial options, knowledge gaps and hence scope for future research. It highlights the use of natural polyphenol-rich green wastes as nanofertilizers, bioamendments, biofilters and bacteriostats. Field application strategies such as microbe-assisted phytoremediation, bioaugmention and biostimulation are also emphasized, showing the multifunctional biotechnological potentials offered by natural polyphenols.

DOI 10.1016/j.eti.2015.04.001
Citations Scopus - 15
Co-authors Ravi Naidu, Thava Palanisami
2015 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Toxicity and oxidative stress induced by used and unused motor oil on freshwater microalga, Pseudokirchneriella subcapitata', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 22 8890-8901 (2015) [C1]
DOI 10.1007/s11356-014-3403-9
Citations Scopus - 6Web of Science - 11
Co-authors Ravi Naidu
2015 Thavamani P, Smith E, Kavitha R, Mathieson G, Megharaj M, Srivastava P, Naidu R, 'Risk based land management requires focus beyond the target contaminants-A case study involving weathered hydrocarbon contaminated soils', Environmental Technology and Innovation, 4 98-109 (2015) [C1]

© 2015 Elsevier B.V. Irrespective of the nature of contamination, the use of total contaminant loading as a measure of risk together with conservative policy guidance is proving ... [more]

© 2015 Elsevier B.V. Irrespective of the nature of contamination, the use of total contaminant loading as a measure of risk together with conservative policy guidance is proving major stumbling block towards remediation of contaminated sites. The objective of this study was to investigate the use of risk based approach to manage contaminated sites at field scale. This study recognizes the presence of weathered hydrocarbon compounds in long-term total petroleum hydrocarbon (TPH) contaminated soils and that such compounds may not pose risk to local receptors. A multispecies ecotoxicological assessment was used to determine the potential risk from weathered hydrocarbons to the surrounding environment. The ecotoxicity of soil residual TPHs was evaluated using earthworm, water-flea, two native and two non-native Australian plants, and soil microbial activity. Plant germination was 100% in all soils but post germination, seedlings except Ryegrass failed to establish. Earthworm toxicity studies found that there was a negative impact on earthworm reproduction and mortality. Further investigation of the poor plant growth and earthworm mortality revealed that it was due to the elevated salinity that developed due to surface evaporation of the saturated calcium sulphate and not residual soil TPHs. Toxicity assessment of the soil leachate on the aquatic environment showed no effect on the survival of water-flea even though the TPH concentrations in the first year leachate were as high as 1.6 mg TPH L -1 . The study concluded that the residual TPHs in soils had little impact on a range of environmental receptors. Assessment of the residual TPH ecotoxicity was complicated by the elevated salinity of stockpile soils which impacted on the earthworm and phytotoxicity assessments. Therefore results of this study suggest that it is paramount to focus beyond target contaminants while implementing risk-based management approach. Indicators for risk based assessment are considered critical for regulatory decision making. The results of this study provide a valuable input in to the risk based management of contaminated sites.

DOI 10.1016/j.eti.2015.04.005
Citations Scopus - 6
Co-authors Thava Palanisami, Ravi Naidu
2015 Duan L, Naidu R, Liu Y, Palanisami T, Dong Z, Mallavarapu M, Semple KT, 'Effect of ageing on benzo[a]pyrene extractability in contrasting soils', Journal of Hazardous Materials, 296 175-184 (2015) [C1]
DOI 10.1016/j.jhazmat.2015.04.050
Citations Scopus - 12Web of Science - 11
Co-authors Luchun Duan, Yanju Liu, Morrow Dong, Ravi Naidu, Thava Palanisami
2015 Huang L, Luo F, Chen Z, Megharaj M, Naidu R, 'Green synthesized conditions impacting on the reactivity of Fe NPs for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 137 154-159 (2015)
DOI 10.1016/j.saa.2014.08.116
Citations Scopus - 11Web of Science - 12
Co-authors Zuliang Chen, Ravi Naidu
2015 Luo F, Yang D, Chen Z, Megharaj M, Naidu R, 'The mechanism for degrading Orange II based on adsorption and reduction by ion-based nanoparticles synthesized by grape leaf extract', Journal of Hazardous Materials, 296 37-45 (2015) [C1]
DOI 10.1016/j.jhazmat.2015.04.027
Citations Scopus - 15Web of Science - 12
Co-authors Zuliang Chen, Ravi Naidu
2015 Kuang Y, Du J, Zhou R, Chen Z, Megharaj M, Naidu R, 'Calcium alginate encapsulated Ni/Fe nanoparticles beads for simultaneous removal of Cu (II) and monochlorobenzene', Journal of Colloid and Interface Science, 447 85-91 (2015) [C1]
DOI 10.1016/j.jcis.2015.01.080
Citations Scopus - 18Web of Science - 17
Co-authors Ravi Naidu, Zuliang Chen, Jianhua Du
2015 Li R, Gao Y, Jin X, Chen Z, Megharaj M, Naidu R, 'Fenton-like oxidation of 2,4-DCP in aqueous solution using iron-based nanoparticles as the heterogeneous catalyst', Journal of Colloid and Interface Science, 438 87-93 (2015) [C1]
DOI 10.1016/j.jcis.2014.09.082
Citations Scopus - 23Web of Science - 20
Co-authors Ravi Naidu, Zuliang Chen
2015 Li R, Jin X, Megharaj M, Naidu R, Chen Z, 'Heterogeneous Fenton oxidation of 2,4-dichlorophenol using iron-based nanoparticles and persulfate system', Chemical Engineering Journal, 264 587-594 (2015) [C1]
DOI 10.1016/j.cej.2014.11.128
Citations Scopus - 51Web of Science - 49
Co-authors Ravi Naidu, Zuliang Chen
2015 Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Ecological implications of motor oil pollution: Earthworm survival and soil health', Soil Biology and Biochemistry, 85 72-81 (2015) [C1]
DOI 10.1016/j.soilbio.2015.02.026
Citations Scopus - 9Web of Science - 9
Co-authors Ravi Naidu
2015 Jiang C, Xu X, Megharaj M, Naidu R, Chen Z, 'Inhibition or promotion of biodegradation of nitrate by Paracoccus sp. in the presence of nanoscale zero-valent iron', Science of the Total Environment, 530-531 241-246 (2015) [C1]
DOI 10.1016/j.scitotenv.2015.05.044
Citations Scopus - 14Web of Science - 12
Co-authors Zuliang Chen, Ravi Naidu
2015 Abbasian F, Lockington R, Mallavarapu M, Naidu R, 'A Comprehensive Review of Aliphatic Hydrocarbon Biodegradation by Bacteria', Applied Biochemistry and Biotechnology, 176 670-699 (2015)
DOI 10.1007/s12010-015-1603-5
Citations Scopus - 20Web of Science - 20
Co-authors Ravi Naidu
2015 Subramaniyam V, Subashchandrabose SR, Thavamani P, Megharaj M, Chen Z, Naidu R, 'Chlorococcum sp. MM11¿a novel phyco-nanofactory for the synthesis of iron nanoparticles', Journal of Applied Phycology, 27 1861-1869 (2015)
DOI 10.1007/s10811-014-0492-2
Citations Scopus - 9Web of Science - 10
Co-authors Zuliang Chen, Suresh Subashchandrabose, Thava Palanisami, Ravi Naidu
2015 Krishnamurti GSR, Subashchandrabose SR, Megharaj M, Naidu R, 'Assessment of bioavailability of heavy metal pollutants using soil isolates of Chlorella sp.', Environmental Science and Pollution Research, 22 8826-8832 (2015)
DOI 10.1007/s11356-013-1799-2
Citations Scopus - 3Web of Science - 3
Co-authors Ravi Naidu, Suresh Subashchandrabose
2015 Duan L, Naidu R, Thavamani P, Meaklim J, Megharaj M, 'Managing long-term polycyclic aromatic hydrocarbon contaminated soils: a risk-based approach', Environmental Science and Pollution Research, 22 8927-8941 (2015)
DOI 10.1007/s11356-013-2270-0
Citations Scopus - 14Web of Science - 9
Co-authors Luchun Duan, Ravi Naidu, Thava Palanisami
2015 Das P, Megharaj M, Naidu R, 'Perfluorooctane sulfonate release pattern from soils of fire training areas in Australia and its bioaccumulation potential in the earthworm Eisenia fetida', Environmental Science and Pollution Research, 22 8902-8910 (2015)
DOI 10.1007/s11356-013-1782-y
Citations Scopus - 7Web of Science - 6
Co-authors Ravi Naidu
2015 Thavamani P, Megharaj M, Naidu R, 'Metal-tolerant PAH-degrading bacteria: development of suitable test medium and effect of cadmium and its availability on PAH biodegradation', Environmental Science and Pollution Research, 22 8957-8968 (2015)
DOI 10.1007/s11356-013-1850-3
Citations Scopus - 11Web of Science - 9
Co-authors Ravi Naidu, Thava Palanisami
2015 Subashchandrabose SR, Megharaj M, Venkateswarlu K, Naidu R, 'Interaction effects of polycyclic aromatic hydrocarbons and heavy metals on a soil microalga, Chlorococcum sp. MM11', Environmental Science and Pollution Research, 22 8876-8889 (2015)
DOI 10.1007/s11356-013-1679-9
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu, Suresh Subashchandrabose
2015 Smith E, Thavamani P, Ramadass K, Naidu R, Srivastava P, Megharaj M, 'Remediation trials for hydrocarbon-contaminated soils in arid environments: Evaluation of bioslurry and biopiling techniques', International Biodeterioration and Biodegradation, 101 56-65 (2015)
DOI 10.1016/j.ibiod.2015.03.029
Citations Scopus - 9Web of Science - 7
Co-authors Ravi Naidu, Thava Palanisami
2015 Yirsaw BD, Megharaj M, Chen Z, Naidu R, 'Environmental application and ecological significance of nano-zero valent iron', Journal of Environmental Sciences (China), 44 88-98 (2015)
DOI 10.1016/j.jes.2015.07.016
Citations Scopus - 5Web of Science - 4
Co-authors Ravi Naidu, Zuliang Chen
2015 Ramadass K, Smith E, Palanisami T, Mathieson G, Srivastava P, Megharaj M, Naidu R, 'Evaluation of constraints in bioremediation of weathered hydrocarbon-contaminated arid soils through microcosm biopile study', International Journal of Environmental Science and Technology, 12 3597-3612 (2015)
DOI 10.1007/s13762-015-0793-2
Citations Scopus - 3Web of Science - 3
Co-authors Ravi Naidu, Thava Palanisami
2015 Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Adsorption and desorption characteristics of methamphetamine, 3,4-methylenedioxymethamphetamine, and pseudoephedrine in soils', Environmental science and pollution research international, 22 8855-8865 (2015)
DOI 10.1007/s11356-014-2940-6
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu
2015 Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Influence of ageing on lead bioavailability in soils: a swine study', Environmental science and pollution research international, 22 8979-8988 (2015) [C1]
DOI 10.1007/s11356-014-3577-1
Citations Scopus - 7Web of Science - 4
Co-authors Ayanka Wijayawardena, Thava Palanisami, Dane Lamb, Ravi Naidu
2015 Wijayawardena MAA, Naidu R, Megharaj M, Lamb D, Thavamani P, Kuchel T, 'Using soil properties to predict in vivo bioavailability of lead in soils', CHEMOSPHERE, 138 422-428 (2015) [C1]
DOI 10.1016/j.chemosphere.2015.06.073
Citations Scopus - 5Web of Science - 4
Co-authors Thava Palanisami, Ravi Naidu, Dane Lamb, Ayanka Wijayawardena
2015 Fang C, Megharaj M, Naidu R, 'Chemical oxidization of some AFFFs leads to the formation of 6:2FTS and 8:2FTS', Environmental Toxicology and Chemistry, 34 2625-2628 (2015) [C1]

© 2015 SETAC. The present study tested some aqueous film-forming foam (AFFF) products for the presence of or the potential to form 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FT... [more]

© 2015 SETAC. The present study tested some aqueous film-forming foam (AFFF) products for the presence of or the potential to form 1H,1H,2H,2H-perfluorooctanesulfonic acid (6:2FTS) and 1H,1H,2H,2H-perfluorodecane sulfonic acid (8:2FTS). The results demonstrated the appearance of significant levels of 6:2FTS and 8:2FTS after the oxidization of those AFFFs. The authors concluded that fluorotelomer skeletons exist but are derived from those formulations of AFFFs.

DOI 10.1002/etc.3115
Citations Scopus - 10Web of Science - 8
Co-authors Ravi Naidu, Cheng Fang
2015 Arias Espana VA, Mallavarapu M, Naidu R, 'Treatment technologies for aqueous perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA): A critical review with an emphasis on field testing', Environmental Technology & Innovation, 4 168-181 (2015) [C1]
DOI 10.1016/j.eti.2015.06.001
Citations Scopus - 12
Co-authors Ravi Naidu
2015 Singh S, Thavamani P, Megharaj M, Naidu R, 'Multifarious activities of cellulose degrading bacteria from Koala (Phascolarctos cinereus) faeces.', Journal of animal science and technology, 57 23 (2015) [C1]
DOI 10.1186/s40781-015-0056-2
Co-authors Ravi Naidu, Thava Palanisami
2015 Abbasian F, Lockington R, Megharaj M, Naidu R, 'The integration of sequencing and bioinformatics in metagenomics', REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY, 14 357-383 (2015) [C1]
DOI 10.1007/s11157-015-9365-7
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu
2015 Kallubai M, Amineni U, Mallavarapu M, Kadiyala V, 'In silico approach to support that p-nitrophenol monooxygenase from Arthrobacter sp. strain JS443 catalyzes the initial two sequential monooxygenations', Interdisciplinary Sciences: Computational Life Sciences, 7 157-167 (2015)
DOI 10.1007/s12539-015-0018-x
Citations Scopus - 3Web of Science - 3
2015 Wang L, Yang D, Lamb D, Chen Z, Lesniewsk PJ, Mallavarapu M, Naidu R, 'Application of mathematical models and genetic algorithm to simulate the response characteristics of an ion selective electrode array for system recalibration', Chemometrics and Intelligent Laboratory Systems, 144 24-30 (2015) [C1]
DOI 10.1016/j.chemolab.2015.03.007
Citations Scopus - 2Web of Science - 2
Co-authors Liang Wang, Ravi Naidu, Dane Lamb
2015 Kader M, Lamb DT, Correll R, Megharaj M, Naidu R, 'Pore-water chemistry explains zinc phytotoxicity in soil', Ecotoxicology and Environmental Safety, 122 252-259 (2015) [C1]

© 2015 Elsevier Inc. Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological recepto... [more]

© 2015 Elsevier Inc. Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological receptors remains difficult due to the complexity of soil characteristics. In this study, we examined solid-solution partitioning using pore-water data and toxicity of Zn to cucumber (Cucumis sativus L.) in spiked soils. Pore-water effective concentration (ECx, x=10%, 20% and 50% reduction) values were negatively related to pH, indicating lower Zn pore water concentration were needed to cause phytotoxicity at high pH soils. Total dissolved zinc (Zn < inf > pw < /inf > ) and free zinc (Zn < sup > 2+ < /sup > ) in soil-pore water successfully described 78% and 80.3% of the variation in relative growth (%) in the full dataset. When the complete data set was used (10 soils), the estimated EC50 < inf > pw < /inf > was 450 and 79.2µM for Zn < inf > pw < /inf > and Zn < sup > 2+ < /sup > , respectively. Total added Zn, soil pore water pH (pH < inf > pw < /inf > ) and dissolve organic carbon (DOC) were the best predictors of Zn < inf > pw < /inf > and Zn < sup > 2+ < /sup > in pore-water. The EC10 (total loading) values ranged from 179 to 5214mg/kg, depending on soil type. Only pH measurements in soil were related to ECx total Zn data. The strongest relationship to ECx overall was pH < inf > ca < /inf > , although pH < inf > w < /inf > and pH < inf > pw < /inf > were in general related to Zn ECx. Similarly, when a solution-only model was used to predict Zn in shoot, DOC was negatively related to Zn in shoot, indicating a reduction in uptake/ translocation of Zn from solution with increasing DOC.

DOI 10.1016/j.ecoenv.2015.08.004
Citations Scopus - 8Web of Science - 7
Co-authors Ravi Naidu, Dane Lamb
2015 Mukkata K, Kantachote D, Wittayaweerasak B, Techkarnjanaruk S, Mallavarapu M, Naidu R, 'Distribution of Mercury in Shrimp Ponds and Volatilization of Hg by Isolated Resistant Purple Nonsulfur Bacteria', WATER AIR AND SOIL POLLUTION, 226 (2015) [C1]
DOI 10.1007/s11270-015-2418-2
Citations Scopus - 3Web of Science - 2
Co-authors Ravi Naidu
2015 Yu B, Jin X, Kuang Y, Megharaj M, Naidu R, Chen Z, 'An integrated biodegradation and nano-oxidation used for the remediation of naphthalene from aqueous solution', CHEMOSPHERE, 141 205-211 (2015) [C1]
DOI 10.1016/j.chemosphere.2015.07.050
Citations Scopus - 4Web of Science - 3
Co-authors Zuliang Chen, Ravi Naidu
2015 Poorvisha R, Suriyaraj SP, Thavamani P, Naidu R, Megharaj M, Bhattacharyya A, Selvakumar R, 'Synthesis and characterisation of 3-dimensional hydroxyapatite nanostructures using a thermoplastic polyurethane nanofiber sacrificial template', RSC Advances, 5 97773-97780 (2015) [C1]

© The Royal Society of Chemistry 2015. In this study, we report a facile synthesis of shape controlled three dimensional hydroxyapatite nanostructures (HAp) using a sacrificial t... [more]

© The Royal Society of Chemistry 2015. In this study, we report a facile synthesis of shape controlled three dimensional hydroxyapatite nanostructures (HAp) using a sacrificial thermoplastic polyurethane (TPU) nanofiber template. The TPU nanofibers synthesised using an electrospinning process were used as a template during the HAp synthesis through a precipitation process. Various HAp morphologies including distinctly placed cylindrically porous HAp architecture, coral reef like, tightly packed fibrous sheet like and nanofiber like were synthesised using the TPU nanofiber template. All the synthesised HAp were characterized using appropriate techniques like Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) attached with selected area electron diffraction (SAED), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The morphology, pore arrangement and the particle size of the HAp varied significantly with varying dimensions of the template and the template available per unit area of HAp. Hence, we have achieved four different 3D HAp morphologies using a single type of TPU nanofiber template. The TPU templated HAp nanostructures were more biodegradable than the control HAp.

DOI 10.1039/c5ra18593a
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Thava Palanisami
2015 Wang Z, Fang C, Mallavarapu M, 'Characterization of iron-polyphenol complex nanoparticles synthesized by Sage (Salvia officinalis) leaves', Environmental Technology and Innovation, 4 92-97 (2015)

© 2015 Elsevier B.V. In this paper iron-polyphenol complex nanoparticles (Fe-P NPs) were synthesized by Sage (Salvia officinalis) leaf extract, which have excellent adsorptive-fl... [more]

© 2015 Elsevier B.V. In this paper iron-polyphenol complex nanoparticles (Fe-P NPs) were synthesized by Sage (Salvia officinalis) leaf extract, which have excellent adsorptive-flocculation capacity for water treatment. They were characterized using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) so that their surface properties could be understood. It was found that synthesized Fe-P NPs were cross-linked in colloid with spherical particles ranged from 5 to 25 nm. Their surfaces were capped with O-H groups. Dried powder derived from Fe-P NPs colloid can remain stable after several hours and then be partially oxidized to iron oxide on exposure to air. Removal of cationic dye ethyl violet with Fe-P NPs was tested to confirm that the surface charge on Fe-P NPs is positive.

DOI 10.1016/j.eti.2015.05.004
Citations Scopus - 3
Co-authors Cheng Fang
2015 Wang L, Liu E, Cheng Y, Bekele DN, Lamb D, Chen Z, et al., 'Novel methodologies for automatically and simultaneously determining BTEX components using FTIR spectra', Talanta, 144 1104-1110 (2015) [C1]

© 2015 Elsevier B.V. This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data locat... [more]

© 2015 Elsevier B.V. This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data located at 'fingerprint' region (wavenumber 670-800 cm < sup > -1 < /sup > ), to simultaneously determinate multiple petroleum hydrocarbons (PHs) in real mixture samples. This system includes: an object oriented baseline correction; Band decomposition (curve fitting) method with mathematical optimization; and Artificial Neural Network (ANN) for determination, which is suitable for the characteristics of this IR regions, where the spectra are normally with low signal to noise ratio and high density of peaks. BTEX components are potentially lethal carcinogens and contained in many petroleum products. As a case study, six BTEX components were determinate automatically and simultaneously in mixture vapor samples. The robustness of the BTEX determination was validated using real petroleum samples, and the prediction results were compared with gas chromatography-mass spectrometry (GC-MS).

DOI 10.1016/j.talanta.2015.07.044
Citations Scopus - 2Web of Science - 2
Co-authors Ravi Naidu, Dane Lamb, Liang Wang, Zuliang Chen, Dawit Bekele
2015 Wang L, Yang D, Fang C, Chen Z, Lesniewski PJ, Mallavarapu M, Naidu R, 'Application of neural networks with novel independent component analysis methodologies to a Prussian blue modified glassy carbon electrode array', Talanta, 131 395-403 (2015) [C1]
DOI 10.1016/j.talanta.2014.08.010
Citations Scopus - 4Web of Science - 3
Co-authors Cheng Fang, Ravi Naidu, Zuliang Chen, Liang Wang
2015 Abbasian F, Lockington R, Mallavarapu M, Naidu R, 'A pyrosequencing-based analysis of microbial diversity governed by ecological conditions in the Winogradsky column', WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 31 1115-1126 (2015) [C1]
DOI 10.1007/s11274-015-1861-y
Citations Scopus - 4Web of Science - 6
Co-authors Ravi Naidu
2015 Arias E VA, Mallavarapu M, Naidu R, 'Identification of the source of PFOS and PFOA contamination at a military air base site', Environmental Monitoring and Assessment, 187 4111-4111 (2015) [C1]
DOI 10.1007/s10661-014-4111-0
Citations Scopus - 4
Co-authors Ravi Naidu
2015 Lin J, Weng X, Jin X, Megharaj M, Naidu R, Chen Z, 'Reactivity of iron-based nanoparticles by green synthesis under various atmospheres and their removal mechanism of methylene blue', RSC ADVANCES, 5 70874-70882 (2015) [C1]
DOI 10.1039/c5ra10629j
Citations Scopus - 5Web of Science - 6
Co-authors Zuliang Chen, Ravi Naidu
2014 Selvakumar R, Seethalakshmi N, Thavamani P, Naidu R, Megharaj M, 'Recent advances in the synthesis of inorganic nano/microstructures using microbial biotemplates and their applications', RSC ADVANCES, 4 52156-52169 (2014)
DOI 10.1039/c4ra07903e
Citations Scopus - 18Web of Science - 17
Co-authors Ravi Naidu, Thava Palanisami
2014 Gan L, Cheng Y, Palanisami T, Chen Z, Megharaj M, Naidu R, 'Pathways of reductive degradation of crystal violet in wastewater using free-strain Burkholderia vietnamiensis C09V', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 10339-10348 (2014)
DOI 10.1007/s11356-014-3037-y
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu, Zuliang Chen
2014 Lin C, Gan L, Chen Z, Megharaj M, Naidu R, 'Biodegradation of naphthalene using a functional biomaterial based on immobilized Bacillus fusiformis (BFN)', Biochemical Engineering Journal, 90 1-7 (2014) [C1]
DOI 10.1016/j.bej.2014.05.003
Citations Scopus - 7Web of Science - 5
Co-authors Ravi Naidu, Zuliang Chen
2014 Cai X, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Removal of co-contaminants Cu (II) and nitrate from aqueous solution using kaolin-Fe/Ni nanoparticles', Chemical Engineering Journal, 244 19-26 (2014) [C1]
DOI 10.1016/j.cej.2014.01.040
Citations Scopus - 18Web of Science - 17
Co-authors Zuliang Chen, Ravi Naidu
2014 Wang F, Gao Y, Sun Q, Chen Z, Megharaj M, Naidu R, 'Degradation of microcystin-LR using functional clay supported bimetallic Fe/Pd nanoparticles based on adsorption and reduction', Chemical Engineering Journal, 255 55-62 (2014) [C1]
DOI 10.1016/j.cej.2014.06.003
Citations Scopus - 5Web of Science - 5
Co-authors Zuliang Chen, Ravi Naidu
2014 Zha S, Cheng Y, Gao Y, Chen Z, Megharaj M, Naidu R, 'Nanoscale zero-valent iron as a catalyst for heterogeneous Fenton oxidation of amoxicillin', Chemical Engineering Journal, 255 141-148 (2014) [C1]
DOI 10.1016/j.cej.2014.06.057
Citations Scopus - 45Web of Science - 43
Co-authors Ravi Naidu, Zuliang Chen
2014 Jin X, Chen Z, Wang T, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of co-contaminants: acid brilliant violet and Cu
DOI 10.1007/s11051-014-2657-y
Citations Scopus - 1Web of Science - 1
Co-authors Zuliang Chen, Ravi Naidu
2014 Shi L, Du J, Chen Z, Megharaj M, Naidu R, 'Functional kaolinite supported Fe/Ni nanoparticles for simultaneous catalytic remediation of mixed contaminants (lead and nitrate) from wastewater', Journal of Colloid and Interface Science, 428 302-307 (2014) [C1]
DOI 10.1016/j.jcis.2014.04.059
Citations Scopus - 5Web of Science - 5
Co-authors Zuliang Chen, Ravi Naidu, Jianhua Du
2014 Weng X, Sun Q, Lin S, Chen Z, Megharaj M, Naidu R, 'Enhancement of catalytic degradation of amoxicillin in aqueous solution using clay supported bimetallic Fe/Ni nanoparticles', Chemosphere, 103 80-85 (2014) [C1]
DOI 10.1016/j.chemosphere.2013.11.033
Citations Scopus - 22Web of Science - 20
Co-authors Zuliang Chen, Ravi Naidu
2014 Liu Y, Li S, Chen Z, Megharaj M, Naidu R, 'Influence of zero-valent iron nanoparticles on nitrate removal by Paracoccus sp.', Chemosphere, 108 426-432 (2014) [C1]
DOI 10.1016/j.chemosphere.2014.02.045
Citations Scopus - 20Web of Science - 18
Co-authors Zuliang Chen, Ravi Naidu
2014 Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of Fe nanoparticles using eucalyptus leaf extracts for treatment of eutrophic wastewater', Science of the Total Environment, 466-467 210-213 (2014) [C1]
DOI 10.1016/j.scitotenv.2013.07.022
Citations Scopus - 82Web of Science - 66
Co-authors Ravi Naidu, Zuliang Chen
2014 Duan L, Palanisami T, Liu Y, Dong Z, Mallavarapu M, Kuchel T, et al., 'Effects of ageing and soil properties on the oral bioavailability of benzo[a]pyrene using a swine model', Environment International, 70 192-202 (2014)
DOI 10.1016/j.envint.2014.05.017
Citations Scopus - 25Web of Science - 24
Co-authors Thava Palanisami, Luchun Duan, Yanju Liu, Morrow Dong, Ravi Naidu
2014 Wang T, Lin J, Chen Z, Megharaj M, Naidu R, 'Green synthesized iron nanoparticles by green tea and eucalyptus leaves extracts used for removal of nitrate in aqueous solution', Journal of Cleaner Production, 83 413-419 (2014) [C1]
DOI 10.1016/j.jclepro.2014.07.006
Citations Scopus - 46Web of Science - 44
Co-authors Zuliang Chen, Ravi Naidu
2014 Luo F, Chen Z, Megharaj M, Naidu R, 'Biomolecules in grape leaf extract involved in one-step synthesis of iron-based nanoparticles', RSC Advances, 4 53467-53474 (2014) [C1]
DOI 10.1039/c4ra08808e
Citations Scopus - 12Web of Science - 10
Co-authors Ravi Naidu, Zuliang Chen
2014 Zhou F, Cheng Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Burkholderia vietnamiensis C09V as the functional biomaterial used to remove crystal violet and Cu(II)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 105 1-6 (2014)
DOI 10.1016/j.ecoenv.2014.03.028
Citations Scopus - 5Web of Science - 5
Co-authors Ravi Naidu, Zuliang Chen
2014 Wang Z, Yu C, Fang C, Mallavarapu M, 'Dye removal using iron-polyphenol complex nanoparticles synthesized by plant leaves', Environmental Technology and Innovation, 1-2 29-34 (2014)

© 2014 Elsevier B.V. This paper examined the ability of iron-polyphenol complex nanoparticles (Fe-P NPs) synthesized by eucalyptus leaf extracts as a novel adsorptive flocculant ... [more]

© 2014 Elsevier B.V. This paper examined the ability of iron-polyphenol complex nanoparticles (Fe-P NPs) synthesized by eucalyptus leaf extracts as a novel adsorptive flocculant to remove acid black 194 from aqueous solution. The influential parameters such as ratios of reagents, doses of Fe-P NPs, pH, temperatures and initial dye concentration were tested. The kinetics, experimental equilibrium and thermodynamic data for acid black 194 and Fe-P NPs systems were collected. The adsorption of dye on Fe-P NPs appears to be a physical process. This study confirms that removal of dye utilizing Fe-P NPs is more efficient than using traditional inorganic flocculant FeCl < inf > 3 < /inf > . The Fe-P NPs could be employed as inexpensive and low-toxic adsorptive flocculant for removing dye from water.

DOI 10.1016/j.eti.2014.08.003
Citations Scopus - 1
Co-authors Cheng Fang
2014 Lin Y, Chen Z, Chen Z, Megharaj M, Naidu R, 'Decoloration of acid violet red B by bentonite-supported nanoscale zero-valent iron: Reactivity, Characterization, kinetics and reaction pathway', APPLIED CLAY SCIENCE, 93-94 56-61 (2014)
DOI 10.1016/j.clay.2014.02.020
Citations Scopus - 18Web of Science - 18
Co-authors Zuliang Chen, Ravi Naidu
2014 Weng X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Clay supported bimetallic Fe/Ni nanoparticles used for reductive degradation of amoxicillin in aqueous solution: Characterization and kinetics', COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 443 404-409 (2014)
DOI 10.1016/j.colsurfa.2013.11.047
Citations Scopus - 14Web of Science - 11
Co-authors Zuliang Chen, Ravi Naidu
2014 Liu X, Wang F, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton oxidation of Direct Black G in dye effluent using functional kaolin-supported nanoscale zero iron', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 21 1936-1943 (2014)
DOI 10.1007/s11356-013-2099-6
Citations Scopus - 1Web of Science - 2
Co-authors Zuliang Chen, Ravi Naidu
2014 Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of Pb(II) and Cr(III) by magnetite nanoparticles using various synthesis conditions', JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 20 3543-3549 (2014)
DOI 10.1016/j.jiec.2013.12.047
Citations Scopus - 19Web of Science - 18
Co-authors Ravi Naidu, Zuliang Chen
2014 Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles using oolong tea extract for the degradation of malachite green', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 117 801-804 (2014)
DOI 10.1016/j.saa.2013.09.054
Citations Scopus - 45Web of Science - 31
Co-authors Zuliang Chen, Ravi Naidu
2014 Huang L, Weng X, Chen Z, Megharaj M, Naidu R, 'Green synthesis of iron nanoparticles by various tea extracts: Comparative study of the reactivity', SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 130 295-301 (2014)
DOI 10.1016/j.saa.2014.04.037
Citations Scopus - 38Web of Science - 36
Co-authors Ravi Naidu, Zuliang Chen
2014 Wang Z, Fang C, Megharaj M, 'Characterization of Iron-Polyphenol Nanoparticles Synthesized by Three Plant Extracts and Their Fenton Oxidation of Azo Dye', ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 2 1022-1025 (2014)
DOI 10.1021/sc500021n
Citations Scopus - 36Web of Science - 27
Co-authors Cheng Fang
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Voltammetric Determination of Lead (II) and Cadmium (II) Using a Bismuth Film Electrode Modified with Mesoporous Silica Nanoparticles', Electrochimica Acta, 132 223-229 (2014) [C1]
DOI 10.1016/j.electacta.2014.03.147
Citations Scopus - 33Web of Science - 31
Co-authors Ravi Naidu, Liang Wang, Zuliang Chen
2014 Subashchandrabose SR, Krishnan K, Gratton E, Megharaj M, Naidu R, 'Potential of fluorescence imaging techniques to monitor mutagenic PAH uptake by microalga', Environmental Science and Technology, 48 9152-9160 (2014) [C1]
DOI 10.1021/es500387v
Citations Scopus - 10Web of Science - 8
Co-authors Ravi Naidu, Suresh Subashchandrabose, Kannan Krishnan
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Anodic stripping voltammetric determination of traces of Pb(II) and Cd(II) using a glassy carbon electrode modified with bismuth nanoparticles', Microchimica Acta, 181 1199-1206 (2014) [C1]
DOI 10.1007/s00604-014-1235-4
Citations Scopus - 14Web of Science - 15
Co-authors Liang Wang, Ravi Naidu, Zuliang Chen
2014 Mayilswami S, Krishnan K, Megharaj M, Naidu R, 'Chronic PFOS exposure alters the expression of neuronal development-related human homologues in Eisenia fetida', Ecotoxicology and Environmental Safety, 110 288-297 (2014) [C1]
DOI 10.1016/j.ecoenv.2014.09.017
Citations Scopus - 5Web of Science - 3
Co-authors Kannan Krishnan, Ravi Naidu
2014 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Determination of Trace Lead and Cadmium in Water Samples by Anodic Stripping Voltammetry with a Nafion-Ionic Liquid-Coated Bismuth Film Electrode', Electroanalysis, 26 639-647 (2014) [C1]
DOI 10.1002/elan.201300622
Citations Scopus - 8Web of Science - 7
Co-authors Zuliang Chen, Liang Wang, Ravi Naidu
2013 Lamb DT, Matanitobua VP, Palanisami T, Megharaj M, Naidu R, 'Bioavailability of Barium to Plants and Invertebrates in Soils Contaminated by Barite', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 47 4670-4676 (2013) [C1]
DOI 10.1021/es302053d
Citations Scopus - 23Web of Science - 20
Co-authors Dane Lamb, Ravi Naidu, Thava Palanisami
2013 Sarkar B, Naidu R, Krishnamurti GSR, Megharaj M, 'Manganese(II)-Catalyzed and Clay-Minerals-Mediated Reduction of Chromium(VI) by Citrate', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 47 13629-13636 (2013) [C1]
DOI 10.1021/es401568k
Citations Scopus - 27Web of Science - 23
Co-authors Ravi Naidu
2013 Chen Z, Wang T, Jin X, Chen Z, Megharaj M, Naidu R, 'Multifunctional kaolinite-supported nanoscale zero-valent iron used for the adsorption and degradation of crystal violet in aqueous solution', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 398 59-66 (2013) [C1]
DOI 10.1016/j.jcis.2013.02.020
Citations Scopus - 69Web of Science - 63
Co-authors Ravi Naidu, Zuliang Chen
2013 Kuang Y, Wang Q, Chen Z, Megharaj M, Naidu R, 'Heterogeneous Fenton-like oxidation of monochlorobenzene using green synthesis of iron nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 410 67-73 (2013) [C1]
DOI 10.1016/j.jcis.2013.08.020
Citations Scopus - 75Web of Science - 69
Co-authors Ravi Naidu, Zuliang Chen
2013 Rathnayake IVN, Megharaj M, Krishnamurti GSR, Bolan NS, Naidu R, 'Heavy metal toxicity to bacteria - Are the existing growth media accurate enough to determine heavy metal toxicity?', CHEMOSPHERE, 90 1195-1200 (2013) [C1]
DOI 10.1016/j.chemosphere.2012.09.036
Citations Scopus - 34Web of Science - 34
Co-authors Ravi Naidu, Nanthi Bolan
2013 Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Illicit drugs and the environment - A review', SCIENCE OF THE TOTAL ENVIRONMENT, 463 1079-1092 (2013)
DOI 10.1016/j.scitotenv.2012.05.086
Citations Scopus - 80Web of Science - 74
Co-authors Ravi Naidu
2013 Sarkar B, Naidu R, Megharaj M, 'Simultaneous Adsorption of Tri- and Hexavalent Chromium by Organoclay Mixtures', WATER AIR AND SOIL POLLUTION, 224 (2013)
DOI 10.1007/s11270-013-1704-0
Citations Scopus - 12Web of Science - 7
Co-authors Ravi Naidu
2013 Das P, Arias E VA, Kambala V, Mallavarapu M, Naidu R, 'Remediation of Perfluorooctane Sulfonate in Contaminated Soils by Modified Clay Adsorbent-a Risk-Based Approach', WATER AIR AND SOIL POLLUTION, 224 (2013) [C1]
DOI 10.1007/s11270-013-1714-y
Citations Scopus - 11Web of Science - 6
Co-authors Ravi Naidu
2013 Sudharshan S, Mallavarapu M, Bolan N, Naidu R, 'Effect of Seaweeds on Degradation of DDT in Soils', WATER AIR AND SOIL POLLUTION, 224 (2013) [C1]
DOI 10.1007/s11270-013-1715-x
Citations Web of Science - 1
Co-authors Nanthi Bolan, Ravi Naidu
2013 Bahar MM, Megharaj M, Naidu R, 'Bioremediation of Arsenic-Contaminated Water: Recent Advances and Future Prospects', WATER AIR AND SOIL POLLUTION, 224 (2013)
DOI 10.1007/s11270-013-1722-y
Citations Scopus - 13Web of Science - 11
Co-authors Mezbaul Bahar, Ravi Naidu
2013 Naidu R, Smith E, Wong MH, Megharaj M, Bolan N, Juhasz AL, Lombi E, 'Remediation of Site Contamination', WATER AIR AND SOIL POLLUTION, 224 (2013)
DOI 10.1007/s11270-013-1723-x
Co-authors Ravi Naidu, Nanthi Bolan
2013 Bahar MM, Megharaj M, Naidu R, 'Bioremediation of arsenic-contaminated water: Recent advances and future prospects topical collection on remediation of site contamination', Water, Air, and Soil Pollution, 224 (2013)

Arsenic contamination of groundwater and surface water is widespread throughout the world. Considering its carcinogenicity and toxicity to human and animal health, remediation of ... [more]

Arsenic contamination of groundwater and surface water is widespread throughout the world. Considering its carcinogenicity and toxicity to human and animal health, remediation of arsenic-contaminated water has become a high priority. There are several physicochemical-based conventional technologies available for removing arsenic from water. However, these technologies possess a number of limitations such as high cost and generation of toxic by-products, etc. Therefore, research on new sustainable and cost-effective arsenic removal technologies for water has recently become an area of intense research activity. Bioremediation technology offers great potential for possible future application in decontamination of pollutants from the natural environment. It is not only environmentally friendly but cost-effective as well. This review focuses on the state-of-art knowledge of currently available arsenic remediation methods, their prospects, and recent advances with particular emphasis on bioremediation strategies. © 2013 Springer Science+Business Media Dordrecht.

DOI 10.1007/s11270-013-1722-y
Citations Scopus - 7
Co-authors Mezbaul Bahar, Ravi Naidu
2013 Subashchandrabose SR, Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, 'Mixotrophic cyanobacteria and microalgae as distinctive biological agents for organic pollutant degradation', ENVIRONMENT INTERNATIONAL, 51 59-72 (2013)
DOI 10.1016/j.envint.2012.10.007
Citations Scopus - 57Web of Science - 49
Co-authors Suresh Subashchandrabose, Ravi Naidu
2013 Jiang C, Liu Y, Chen Z, Megharaj M, Naidu R, 'Impact of iron-based nanoparticles on microbial denitrification by Paracoccus sp. strain YF1', AQUATIC TOXICOLOGY, 142 329-335 (2013)
DOI 10.1016/j.aquatox.2013.09.005
Citations Scopus - 8Web of Science - 7
Co-authors Zuliang Chen, Ravi Naidu
2013 Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of TNT using Bacillus mycoides immobilized in PVA-sodium alginate-kaolin', APPLIED CLAY SCIENCE, 83-84 336-342 (2013)
DOI 10.1016/j.clay.2013.08.004
Citations Scopus - 14Web of Science - 11
Co-authors Ravi Naidu, Zuliang Chen
2013 Naidu R, Juhasz A, Mallavarapu M, Smith E, Lombi E, Bolan NS, et al., 'Chemical Bioavailability in the Terrestrial Environment - recent advances Preface', JOURNAL OF HAZARDOUS MATERIALS, 261 685-686 (2013)
DOI 10.1016/j.jhazmat.2013.10.001
Co-authors Ravi Naidu, Nanthi Bolan
2013 Sarkar B, Megharaj M, Shanmuganathan D, Naidu R, 'Toxicity of organoclays to microbial processes and earthworm survival in soils', JOURNAL OF HAZARDOUS MATERIALS, 261 793-800 (2013) [C1]
DOI 10.1016/j.jhazmat.2012.11.061
Citations Scopus - 14Web of Science - 15
Co-authors Ravi Naidu
2013 Wang T, Su J, Jin X, Chen Z, Megharaj M, Naidu R, 'Functional clay supported bimetallic nZVI/Pd nanoparticles used for removal of methyl orange from aqueous solution', JOURNAL OF HAZARDOUS MATERIALS, 262 819-825 (2013) [C1]
DOI 10.1016/j.jhazmat.2013.09.028
Citations Scopus - 24Web of Science - 24
Co-authors Ravi Naidu, Zuliang Chen
2013 Bahar MM, Megharaj M, Naidu R, 'Kinetics of arsenite oxidation by Variovorax sp MM-1 isolated from a soil and identification of arsenite oxidase gene', JOURNAL OF HAZARDOUS MATERIALS, 262 997-1003 (2013) [C1]
DOI 10.1016/j.jhazmat.2012.11.064
Citations Scopus - 19Web of Science - 15
Co-authors Mezbaul Bahar, Ravi Naidu
2013 Bahar MM, Megharaj M, Naidu R, 'Toxicity, transformation and accumulation of inorganic arsenic species in a microalga Scenedesmus sp isolated from soil', JOURNAL OF APPLIED PHYCOLOGY, 25 913-917 (2013) [C1]
DOI 10.1007/s10811-012-9923-0
Citations Scopus - 15Web of Science - 12
Co-authors Mezbaul Bahar, Ravi Naidu
2013 Weng X, Huang L, Chen Z, Megharaj M, Naidu R, 'Synthesis of iron-based nanoparticles by green tea extract and their degradation of malachite', INDUSTRIAL CROPS AND PRODUCTS, 51 342-347 (2013)
DOI 10.1016/j.indcrop.2013.09.024
Citations Scopus - 46Web of Science - 38
Co-authors Ravi Naidu, Zuliang Chen
2013 Shi L-N, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Simultaneous adsorption and degradation of Zn2+ and Cu2+ from wastewaters using nanoscale zero-valent iron impregnated with clays', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 20 3639-3648 (2013)
DOI 10.1007/s11356-012-1272-7
Citations Scopus - 13Web of Science - 11
Co-authors Zuliang Chen, Ravi Naidu
2013 Kuang Y, Zhou Y, Chen Z, Megharaj M, Naidu R, 'Impact of Fe and Ni/Fe nanoparticles on biodegradation of phenol by the strain Bacillus fusiformis (BFN) at various pH values', BIORESOURCE TECHNOLOGY, 136 588-594 (2013) [C1]
DOI 10.1016/j.biortech.2013.03.018
Citations Scopus - 13Web of Science - 14
Co-authors Zuliang Chen, Ravi Naidu
2013 Yang D, Wang L, Chen Z, Megharaj M, Naidu R, 'Investigation of Copper(II) Interference on the Anodic Stripping Voltammetry of Lead(II) and Cadmium(II) at Bismuth Film Electrode', ELECTROANALYSIS, 25 2637-2644 (2013) [C1]
DOI 10.1002/elan.201300375
Citations Scopus - 19Web of Science - 19
Co-authors Liang Wang, Zuliang Chen, Ravi Naidu
2013 Subashchandrabose SR, Megharaj M, Venkateswarlu K, Lockington R, Naidu R, 'Influence of nutrient mixtures on p-nitrophenol degradation by Stenotrophomonas sp isolated from groundwater', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 48 108-119 (2013)
DOI 10.1080/10934529.2012.707861
Citations Scopus - 2Web of Science - 1
Co-authors Ravi Naidu, Suresh Subashchandrabose
2013 Zhou Y, Kuang Y, Li W, Chen Z, Megharaj M, Naidu R, 'A combination of bentonite-supported bimetallic Fe/Pd nanoparticles and biodegradation for the remediation of p-chlorophenol in wastewater', CHEMICAL ENGINEERING JOURNAL, 223 68-75 (2013) [C1]
DOI 10.1016/j.cej.2013.02.118
Citations Scopus - 18Web of Science - 15
Co-authors Zuliang Chen, Ravi Naidu
2013 Liu X, Chen Z, Chen Z, Megharaj M, Naidu R, 'Remediation of Direct Black G in wastewater using kaolin-supported bimetallic Fe/Ni nanoparticles', CHEMICAL ENGINEERING JOURNAL, 223 764-771 (2013) [C1]
DOI 10.1016/j.cej.2013.03.002
Citations Scopus - 20Web of Science - 22
Co-authors Zuliang Chen, Ravi Naidu
2012 Lin Y, Chen Z, Megharaj M, Naidu R, 'Degradation of scarlet 4BS in aqueous solution using bimetallic Fe/Ni nanoparticles', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 381 30-35 (2012) [C1]
DOI 10.1016/j.jcis.2012.05.035
Citations Scopus - 19Web of Science - 17
Co-authors Ravi Naidu, Zuliang Chen
2012 Choppala GK, Bolan NS, Megharaj M, Chen Z, Naidu R, 'The Influence of Biochar and Black Carbon on Reduction and Bioavailability of Chromate in Soils', JOURNAL OF ENVIRONMENTAL QUALITY, 41 1175-1184 (2012) [C1]
DOI 10.2134/jeq2011.0145
Citations Scopus - 48Web of Science - 44
Co-authors Zuliang Chen, Nanthi Bolan, Ravi Naidu
2012 Cheng Y, Lin H, Chen Z, Megharaj M, Naidu R, 'Biodegradation of crystal violet using Burkholderia vietnamiensis C09V immobilized on PVA-sodium alginate-kaolin gel beads', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 83 108-114 (2012)
DOI 10.1016/j.ecoenv.2012.06.017
Citations Scopus - 33Web of Science - 27
Co-authors Ravi Naidu, Zuliang Chen
2012 Lamb DT, Naidu R, Ming H, Megharaja M, 'Copper phytotoxicity in native and agronomical plant species', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 85 23-29 (2012) [C1]
DOI 10.1016/j.ecoenv.2012.08.018
Citations Scopus - 18Web of Science - 16
Co-authors Dane Lamb, Ravi Naidu
2012 Thavamani P, Megharaj M, Naidu R, 'Multivariate analysis of mixed contaminants (PAHs and heavy metals) at manufactured gas plant site soils', ENVIRONMENTAL MONITORING AND ASSESSMENT, 184 3875-3885 (2012)
DOI 10.1007/s10661-011-2230-4
Citations Scopus - 39Web of Science - 37
Co-authors Ravi Naidu, Thava Palanisami
2012 Thavamani P, Malik S, Beer M, Megharaj M, Naidu R, 'Microbial activity and diversity in long-term mixed contaminated soils with respect to polyaromatic hydrocarbons and heavy metals', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 99 10-17 (2012)
DOI 10.1016/j.jenvman.2011.12.030
Citations Scopus - 69Web of Science - 63
Co-authors Thava Palanisami, Ravi Naidu
2012 Liu Y, Gan L, Chen Z, Megharaj M, Naidu R, 'Removal of nitrate using Paracoccus sp YF1 immobilized on bamboo carbon', JOURNAL OF HAZARDOUS MATERIALS, 229 419-425 (2012) [C1]
DOI 10.1016/j.jhazmat.2012.06.029
Citations Scopus - 21Web of Science - 16
Co-authors Zuliang Chen, Ravi Naidu
2012 Pal R, Megharaj M, Naidu R, Klass G, Cox M, Kirkbride KP, 'Degradation in soil of precursors and by-products associated with the illicit manufacture of methylamphetamine: Implications for clandestine drug laboratory investigation', FORENSIC SCIENCE INTERNATIONAL, 220 245-250 (2012)
DOI 10.1016/j.forsciint.2012.03.011
Citations Scopus - 4Web of Science - 3
Co-authors Ravi Naidu
2012 Subashchandrabose SR, Megharaj M, Venkateswarlu K, Naidu R, 'p-nitrophenol toxicity to and its removal by three select soil isolates of microalgae: The role of antioxidants', ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 31 1980-1988 (2012) [C1]
DOI 10.1002/etc.1931
Citations Scopus - 12Web of Science - 12
Co-authors Ravi Naidu, Suresh Subashchandrabose
2012 Bahar MM, Megharaj M, Naidu R, 'Arsenic bioremediation potential of a new arsenite-oxidizing bacterium Stenotrophomonas sp MM-7 isolated from soil', BIODEGRADATION, 23 803-812 (2012)
DOI 10.1007/s10532-012-9567-4
Citations Scopus - 38Web of Science - 30
Co-authors Ravi Naidu, Mezbaul Bahar
2012 Thavamani P, Megharaj M, Naidu R, 'Bioremediation of high molecular weight polyaromatic hydrocarbons co-contaminated with metals in liquid and soil slurries by metal tolerant PAHs degrading bacterial consortium', BIODEGRADATION, 23 823-835 (2012)
DOI 10.1007/s10532-012-9572-7
Citations Scopus - 33Web of Science - 29
Co-authors Ravi Naidu, Thava Palanisami
2012 Sudharshan S, Naidu R, Mallavarapu M, Bolan N, 'DDT remediation in contaminated soils: a review of recent studies', BIODEGRADATION, 23 851-863 (2012)
DOI 10.1007/s10532-012-9575-4
Citations Scopus - 30Web of Science - 28
Co-authors Nanthi Bolan, Ravi Naidu
2012 Naidu R, Nandy S, Megharaj M, Kumar RP, Chadalavada S, Chen Z, Bowman M, 'Monitored natural attenuation of a long-term petroleum hydrocarbon contaminated sites: a case study', BIODEGRADATION, 23 881-895 (2012)
DOI 10.1007/s10532-012-9580-7
Citations Scopus - 11Web of Science - 7
Co-authors Ravi Naidu, Zuliang Chen
2012 Sarkar B, Naidu R, Rahman MM, Megharaj M, Xi Y, 'Organoclays reduce arsenic bioavailability and bioaccessibility in contaminated soils', JOURNAL OF SOILS AND SEDIMENTS, 12 704-712 (2012)
DOI 10.1007/s11368-012-0487-z
Citations Scopus - 15Web of Science - 14
Co-authors Ravi Naidu, Mahmud Rahman
2012 Pal R, Megharaj M, Kirkbride KP, Naidu R, 'Fate of 1-(1 ',4 '-cyclohexadienyl)-2-methylaminopropane (CMP) in soil: Route-specific by-product in the clandestine manufacture of methamphetamine', SCIENCE OF THE TOTAL ENVIRONMENT, 416 394-399 (2012) [C1]
DOI 10.1016/j.scitotenv.2011.11.023
Citations Scopus - 4Web of Science - 4
Co-authors Ravi Naidu
2012 Park JH, Bolan N, Megharaj M, Naidu R, 'Relative Value of Phosphate Compounds in Reducing the Bioavailability and Toxicity of Lead in Contaminated Soils', WATER AIR AND SOIL POLLUTION, 223 599-608 (2012)
DOI 10.1007/s11270-011-0885-7
Citations Scopus - 9Web of Science - 7
Co-authors Ravi Naidu, Nanthi Bolan
2012 Ming H, He W, Lamb DT, Megharaj M, Naidu R, 'Bioavailability of lead in contaminated soil depends on the nature of bioreceptor', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 78 344-350 (2012) [C1]
DOI 10.1016/j.ecoenv.2011.11.045
Citations Scopus - 10Web of Science - 11
Co-authors Dane Lamb, Ravi Naidu
2012 Sreenivasulu C, Megharaj M, Venkateswarlu K, Naidu R, 'Degradation of p-nitrophenol by immobilized cells of Bacillus spp. isolated from soil', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 68 24-27 (2012)
DOI 10.1016/j.ibiod.2011.12.006
Citations Scopus - 10Web of Science - 8
Co-authors Ravi Naidu
2012 Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Bowman M, Rose H, Naidu R, 'Bioreactive Organoclay: A New Technology for Environmental Remediation', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 42 435-488 (2012)
DOI 10.1080/10643389.2010.518524
Citations Scopus - 40Web of Science - 37
Co-authors Ravi Naidu
2012 Sarkar B, Megharaj M, Xi Y, Naidu R, 'Surface charge characteristics of organo-palygorskites and adsorption of p-nitrophenol in flow-through reactor system', CHEMICAL ENGINEERING JOURNAL, 185 35-43 (2012) [C1]
DOI 10.1016/j.cej.2011.05.062
Citations Scopus - 36Web of Science - 34
Co-authors Ravi Naidu
2012 Chen Z-X, Cheng Y, Chen Z, Megharaj M, Naidu R, 'Kaolin-supported nanoscale zero-valent iron for removing cationic dye-crystal violet in aqueous solution', JOURNAL OF NANOPARTICLE RESEARCH, 14 (2012) [C1]
DOI 10.1007/s11051-012-0899-0
Citations Scopus - 23Web of Science - 21
Co-authors Zuliang Chen, Ravi Naidu
2011 Panwichian S, Kantachote D, Wittayaweerasak B, Mallavarapu M, 'Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds', ELECTRONIC JOURNAL OF BIOTECHNOLOGY, 14 (2011)
DOI 10.2225/vol14-issue4-fulltext-2
Citations Scopus - 21Web of Science - 7
2011 Megharaj M, Venkateswarlu K, Naidu R, 'Effects of Carbaryl and 1-Naphthol on Soil Population of Cyanobacteria and Microalgae and Select Cultures of Diazotrophic Cyanobacteria', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 87 324-329 (2011)
DOI 10.1007/s00128-011-0347-3
Citations Scopus - 3Web of Science - 3
Co-authors Ravi Naidu
2011 Sun Q, Chen Z, Yuan D, Yu C-P, Mallavarapu M, Naidu R, 'On-Line SPE Coupled with LC-APCI-MS for the Determination of Trace Explosives in Water', CHROMATOGRAPHIA, 73 631-637 (2011)
DOI 10.1007/s10337-011-1964-z
Citations Scopus - 8Web of Science - 8
Co-authors Zuliang Chen, Ravi Naidu
2011 Su J, Lin S, Chen Z, Megharaj M, Naidu R, 'Dechlorination of p-chlorophenol from aqueous solution using bentonite supported Fe/Pd nanoparticles: Synthesis, characterization and kinetics', DESALINATION, 280 167-173 (2011)
DOI 10.1016/j.desal.2011.06.067
Citations Scopus - 60Web of Science - 54
Co-authors Zuliang Chen, Ravi Naidu
2011 Chen Z-X, Jin X-Y, Chen Z, Megharaj M, Naidu R, 'Removal of methyl orange from aqueous solution using bentonite-supported nanoscale zero-valent iron', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 363 601-607 (2011) [C1]
DOI 10.1016/j.jcis.2011.07.057
Citations Scopus - 114Web of Science - 108
Co-authors Ravi Naidu, Zuliang Chen
2011 Shanmuganathan D, Megharaj M, Chen Z, Naidu R, 'Polybrominated diphenyl ethers (PBDEs) in marine foodstuffs in Australia: Residue levels and contamination status of PBDEs', MARINE POLLUTION BULLETIN, 63 154-159 (2011)
DOI 10.1016/j.marpolbul.2011.06.002
Citations Scopus - 23Web of Science - 22
Co-authors Ravi Naidu, Zuliang Chen
2011 Zhang X, Lin S, Chen Z, Megharaj M, Naidu R, 'Kaolinite-supported nanoscale zero-valent iron for removal of Pb2+ from aqueous solution: Reactivity, characterization and mechanism', WATER RESEARCH, 45 3481-3488 (2011) [C1]
DOI 10.1016/j.watres.2011.04.010
Citations Scopus - 165Web of Science - 145
Co-authors Zuliang Chen, Ravi Naidu
2011 Pal R, Megharaj M, Kirkbride KP, Heinrich T, Naidu R, 'Biotic and abiotic degradation of illicit drugs, their precursor, and by-products in soil', CHEMOSPHERE, 85 1002-1009 (2011) [C1]
DOI 10.1016/j.chemosphere.2011.06.102
Citations Scopus - 12Web of Science - 11
Co-authors Ravi Naidu
2011 Park JH, Bolan N, Megharaj M, Naidu R, 'Comparative value of phosphate sources on the immobilization of lead, and leaching of lead and phosphorus in lead contaminated soils', SCIENCE OF THE TOTAL ENVIRONMENT, 409 853-860 (2011) [C1]
DOI 10.1016/j.scitotenv.2010.11.003
Citations Scopus - 52Web of Science - 46
Co-authors Nanthi Bolan, Ravi Naidu
2011 Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Bates D, Naidu R, 'Ultrasonic Enhanced Desorption of DDT from Contaminated Soils', WATER AIR AND SOIL POLLUTION, 217 115-125 (2011)
DOI 10.1007/s11270-010-0572-0
Citations Scopus - 14Web of Science - 13
Co-authors Ravi Naidu
2011 Thavamani P, Megharaj M, Krishnamurti GSR, McFarland R, Naidu R, 'Finger printing of mixed contaminants from former manufactured gas plant (MGP) site soils: Implications to bioremediation', ENVIRONMENT INTERNATIONAL, 37 184-189 (2011) [C1]
DOI 10.1016/j.envint.2010.08.017
Citations Scopus - 41Web of Science - 39
Co-authors Thava Palanisami, Ravi Naidu
2011 Megharaj M, Ramakrishnan B, Venkateswarlu K, Sethunathan N, Naidu R, 'Bioremediation approaches for organic pollutants: A critical perspective', ENVIRONMENT INTERNATIONAL, 37 1362-1375 (2011)
DOI 10.1016/j.envint.2011.06.003
Citations Scopus - 259Web of Science - 225
Co-authors Ravi Naidu
2011 Sarkar B, Xi Y, Megharaj M, Naidu R, 'Orange II adsorption on palygorskites modified with alkyl trimethylammonium and dialkyl dimethylammonium bromide - An isothermal and kinetic study', APPLIED CLAY SCIENCE, 51 370-374 (2011)
DOI 10.1016/j.clay.2010.11.032
Citations Scopus - 42Web of Science - 38
Co-authors Ravi Naidu
2011 Xi Y, Megharaj M, Naidu R, 'Dispersion of zerovalent iron nanoparticles onto bentonites and use of these catalysts for orange II decolourisation', APPLIED CLAY SCIENCE, 53 716-722 (2011)
DOI 10.1016/j.clay.2011.06.010
Citations Scopus - 21Web of Science - 18
Co-authors Ravi Naidu
2011 Ramakrishnan B, Megharaj M, Venkateswarlu K, Sethunathan N, Naidu R, 'Mixtures of Environmental Pollutants: Effects on Microorganisms and Their Activities in Soils', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 211, 211 63-120 (2011)
DOI 10.1007/978-1-4419-8011-3_3
Citations Scopus - 37Web of Science - 38
Co-authors Ravi Naidu
2011 Park JH, Bolan N, Megharaj M, Naidu R, 'Concomitant rock phosphate dissolution and lead immobilization by phosphate solubilizing bacteria (Enterobacter sp.)', JOURNAL OF ENVIRONMENTAL MANAGEMENT, 92 1115-1120 (2011)
DOI 10.1016/j.jenvman.2010.11.031
Citations Scopus - 28Web of Science - 28
Co-authors Nanthi Bolan, Ravi Naidu
2011 Park JH, Bolan N, Megharaj M, Naidu R, 'Isolation of phosphate solubilizing bacteria and their potential for lead immobilization in soil', JOURNAL OF HAZARDOUS MATERIALS, 185 829-836 (2011) [C1]
DOI 10.1016/j.jhazmat.2010.09.095
Citations Scopus - 59Web of Science - 49
Co-authors Nanthi Bolan, Ravi Naidu
2011 Sarkar B, Megharaj M, Xi Y, Naidu R, 'Structural characterisation of Arquad (R) 2HT-75 organobentonites: Surface charge characteristics and environmental application', JOURNAL OF HAZARDOUS MATERIALS, 195 155-161 (2011) [C1]
DOI 10.1016/j.jhazmat.2011.08.016
Citations Scopus - 27Web of Science - 25
Co-authors Ravi Naidu
2011 Subashchandrabose SR, Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, 'Consortia of cyanobacteria/microalgae and bacteria: Biotechnological potential', BIOTECHNOLOGY ADVANCES, 29 896-907 (2011)
DOI 10.1016/j.biotechadv.2011.07.009
Citations Scopus - 100Web of Science - 96
Co-authors Suresh Subashchandrabose, Ravi Naidu
2011 Caceres TP, Megharaj M, Naidu R, 'Toxicity and transformation of insecticide fenamiphos to the earthworm Eisenia fetida', ECOTOXICOLOGY, 20 20-28 (2011)
DOI 10.1007/s10646-010-0552-6
Citations Scopus - 9Web of Science - 9
Co-authors Ravi Naidu
2011 Park JH, Bolan NS, Chung JW, Naidu R, Megharaj M, 'Environmental monitoring of the role of phosphate compounds in enhancing immobilization and reducing bioavailability of lead in contaminated soils', JOURNAL OF ENVIRONMENTAL MONITORING, 13 2234-2242 (2011)
DOI 10.1039/c1em10275c
Citations Scopus - 18Web of Science - 18
Co-authors Ravi Naidu, Nanthi Bolan
2010 Panwichian S, Kantachote D, Wittayaweerasak B, Mallavarapu M, 'Isolation of purple nonsulfur bacteria for the removal of heavy metals and sodium from contaminated shrimp ponds', ELECTRONIC JOURNAL OF BIOTECHNOLOGY, 13 (2010)
DOI 10.2225/vol13-issue4-fulltext-8
Citations Scopus - 20Web of Science - 7
2010 Panwichian S, Kantachote D, Wittayaweerasak B, Mallavarapu M, 'Factors affecting immobilization of heavy metals by purple nonsulfur bacteria isolated from contaminated shrimp ponds', WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 26 2199-2210 (2010)
DOI 10.1007/s11274-010-0405-8
Citations Scopus - 7Web of Science - 7
2010 Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Naidu R, 'Synthesis and characterisation of novel organopalygorskites for removal of p-nitrophenol from aqueous solution: Isothermal studies', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 350 295-304 (2010)
DOI 10.1016/j.jcis.2010.06.030
Citations Scopus - 52Web of Science - 52
Co-authors Ravi Naidu
2010 Xi Y, Mallavarapu M, Naidu R, 'Reduction and adsorption of Pb2+ in aqueous solution by nano-zero-valent iron-A SEM, TEM and XPS study', MATERIALS RESEARCH BULLETIN, 45 1361-1367 (2010)
DOI 10.1016/j.materresbull.2010.06.046
Citations Scopus - 73Web of Science - 63
Co-authors Ravi Naidu
2010 Sun Q, Yuan D, Chen Z, Megharaj M, Naidu R, 'Reduction of polyatomic interferences during ion-chromatographic speciation of metal ions via their EDTA complexes along with ICP-MS detection using an octopole reaction system', MICROCHIMICA ACTA, 169 41-47 (2010)
DOI 10.1007/s00604-010-0311-7
Citations Scopus - 2Web of Science - 3
Co-authors Zuliang Chen, Ravi Naidu
2010 Patra RC, Malik S, Beer M, Megharaj M, Naidu R, 'Molecular characterization of chromium (VI) reducing potential in Gram positive bacteria isolated from contaminated sites', SOIL BIOLOGY & BIOCHEMISTRY, 42 1857-1863 (2010)
DOI 10.1016/j.soilbio.2010.07.005
Citations Scopus - 23Web of Science - 20
Co-authors Ravi Naidu
2010 Lamb DT, Ming H, Megharaj M, Naidu R, 'Phytotoxicity and Accumulation of Lead in Australian Native Vegetation', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 58 613-621 (2010)
DOI 10.1007/s00244-009-9460-2
Citations Scopus - 10Web of Science - 10
Co-authors Dane Lamb, Ravi Naidu
2010 Lamb DT, Ming H, Megharaj M, Naidu R, 'Relative Tolerance of a Range of Australian Native Plant Species and Lettuce to Copper, Zinc, Cadmium, and Lead', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 59 424-432 (2010)
DOI 10.1007/s00244-010-9481-x
Citations Scopus - 15Web of Science - 16
Co-authors Ravi Naidu, Dane Lamb
2010 Xi Y, Mallavarapu M, Naidu R, 'Preparation, characterization of surfactants modified clay minerals and nitrate adsorption', APPLIED CLAY SCIENCE, 48 92-96 (2010)
DOI 10.1016/j.clay.2009.11.047
Citations Scopus - 92Web of Science - 82
Co-authors Ravi Naidu
2010 Xi Y, Mallavarapu M, Naidu R, 'Adsorption of the herbicide 2,4-D on organo-palygorskite', APPLIED CLAY SCIENCE, 49 255-261 (2010)
DOI 10.1016/j.clay.2010.05.015
Citations Scopus - 58Web of Science - 58
Co-authors Ravi Naidu
2010 Sarkar B, Xi Y, Megharaj M, Krishnamurti GSR, Rajarathnam D, Naidu R, 'Remediation of hexavalent chromium through adsorption by bentonite based Arquad (R) 2HT-75 organoclays', JOURNAL OF HAZARDOUS MATERIALS, 183 87-97 (2010)
DOI 10.1016/j.jhazmat.2010.06.110
Citations Scopus - 73Web of Science - 69
Co-authors Ravi Naidu, Raja Dharmarajan
2010 Sarkar B, Megharaj M, Xi Y, Krishnamurti GSR, Naidu R, 'Sorption of quaternary ammonium compounds in soils: Implications to the soil microbial activities', JOURNAL OF HAZARDOUS MATERIALS, 184 448-456 (2010)
DOI 10.1016/j.jhazmat.2010.08.055
Citations Scopus - 33Web of Science - 33
Co-authors Ravi Naidu
2010 Ramakrishnan B, Megharaj M, Venkateswarlu K, Naidu R, Sethunathan N, 'The Impacts of Environmental Pollutants on Microalgae and Cyanobacteria', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 40 699-821 (2010)
DOI 10.1080/10643380802471068
Citations Scopus - 30Web of Science - 25
Co-authors Ravi Naidu
2010 Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Naidu R, 'Sonochemical destruction of chloroform by using low frequency ultrasound in batch and flow cell', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 45 483-489 (2010)
DOI 10.1080/10934520903539390
Citations Scopus - 3Web of Science - 2
Co-authors Ravi Naidu
2009 Chen Z, He W, Beer M, Megharaj M, Naidu R, 'Speciation of glyphosate, phosphate and aminomethylphosphonic acid in soil extracts by ion chromatography with inductively coupled plasma mass spectrometry with an octopole reaction system', TALANTA, 78 852-856 (2009)
DOI 10.1016/j.talanta.2008.12.052
Citations Scopus - 27Web of Science - 24
Co-authors Ravi Naidu, Zuliang Chen
2009 Basu NB, Suresh P, Rao C, Poyer IC, Nandy S, Mallavarapu M, et al., 'Integration of traditional and innovative characterization techniques for flux-based assessment of Dense Non-aqueous Phase Liquid (DNAPL) sites', JOURNAL OF CONTAMINANT HYDROLOGY, 105 161-172 (2009)
DOI 10.1016/j.jconhyd.2008.12.005
Citations Scopus - 23Web of Science - 25
Co-authors Ravi Naidu
2009 Arora M, Megharaj M, Naidu R, 'Arsenic testing field kits: some considerations and recommendations', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 45-48 (2009)
DOI 10.1007/s10653-008-9231-4
Citations Scopus - 16Web of Science - 15
Co-authors Ravi Naidu
2009 He W, Megharaj M, Naidu R, 'Toxicity of tri- and penta-valent arsenic, alone and in combination, to the cladoceran Daphnia carinata: the influence of microbial transformation in natural waters', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 133-141 (2009)
DOI 10.1007/s10653-008-9239-9
Citations Scopus - 16Web of Science - 11
Co-authors Ravi Naidu
2009 Thangavadivel K, Megharaj M, Smart RSC, Lesniewski PJ, Naidu R, 'Application of high frequency ultrasound in the destruction of DDT in contaminated sand and water', JOURNAL OF HAZARDOUS MATERIALS, 168 1380-1386 (2009)
DOI 10.1016/j.jhazmat.2009.03.024
Citations Scopus - 21Web of Science - 19
Co-authors Ravi Naidu
2009 Lamba DT, Ming H, Megharaj M, Naidu R, 'Heavy metal (Cu, Zn, Cd and Pb) partitioning and bioaccessibility in uncontaminated and long-term contaminated soils', JOURNAL OF HAZARDOUS MATERIALS, 171 1150-1158 (2009)
DOI 10.1016/j.jhazmat.2009.06.124
Citations Scopus - 64Web of Science - 54
Co-authors Ravi Naidu, Dane Lamb
2009 Caceres TP, He W, Megharaj M, Naidu R, 'Effect of insecticide fenamiphos on soil microbial activities in Australian and Ecuadorean soils', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 44 13-17 (2009)
DOI 10.1080/03601230802519504
Citations Scopus - 11Web of Science - 13
Co-authors Ravi Naidu
2009 Chen Z, Owen G, Megharaj M, Naidu R, 'Speciation of Zn-aminopolycarboxylic complexes by electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 419-424 (2009)
DOI 10.1002/rcm.3897
Citations Scopus - 7Web of Science - 6
Co-authors Ravi Naidu, Zuliang Chen
2009 Sun Q, Chen Z, Yuan D, Megharaj M, Naidu R, 'On-line solid-phase extraction coupled with liquid chromatography/electrospray ionization mass spectrometry for the determination of trace tributyltin and triphenyltin in water samples', RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 23 3795-3802 (2009)
DOI 10.1002/rcm.4321
Citations Scopus - 7Web of Science - 6
Co-authors Zuliang Chen, Ravi Naidu
2009 Caceres TP, Megharaj M, Malik S, Beer M, Naidu R, 'Hydrolysis of fenamiphos and its toxic oxidation products by Microbacterium sp in pure culture and groundwater', BIORESOURCE TECHNOLOGY, 100 2732-2736 (2009)
DOI 10.1016/j.biortech.2008.12.043
Citations Scopus - 19Web of Science - 18
Co-authors Ravi Naidu
2009 Guo Z, Megharaj M, Beer M, Ming H, Rahman MM, Wu W, Naidu R, 'Heavy metal impact on bacterial biomass based on DNA analyses and uptake by wild plants in the abandoned copper mine soils', BIORESOURCE TECHNOLOGY, 100 3831-3836 (2009)
DOI 10.1016/j.biortech.2009.02.043
Citations Scopus - 29Web of Science - 25
Co-authors Mahmud Rahman, Ravi Naidu
2009 Sarkar B, Patra AK, Purakayastha TJ, Megharaj M, 'Assessment of biological and biochemical indicators in soil under transgenic Bt and non-Bt cotton crop in a sub-tropical environment', ENVIRONMENTAL MONITORING AND ASSESSMENT, 156 595-604 (2009)
DOI 10.1007/s10661-008-0508-y
Citations Scopus - 29Web of Science - 24
2008 Caceres T, Megharaj M, Naidu R, 'Toxicity and transformation of fenamiphos and its metabolites by two micro algae Pseudokirchneiriella subcapitata and Chlorococcum sp.', SCIENCE OF THE TOTAL ENVIRONMENT, 398 53-59 (2008)
DOI 10.1016/j.scitotenv.2008.03.022
Citations Scopus - 23Web of Science - 24
Co-authors Ravi Naidu
2008 Malik S, Beer M, Megharaj M, Naidu R, 'The use of molecular techniques to characterize the microbial communities in contaminated soil and water', ENVIRONMENT INTERNATIONAL, 34 265-276 (2008)
DOI 10.1016/j.envint.2007.09.001
Citations Scopus - 79Web of Science - 71
Co-authors Ravi Naidu
2008 Caceres TP, Megharaj M, Naidu R, 'Biodegradation of the Pesticide Fenamiphos by Ten Different Species of Green Algae and Cyanobacteria', CURRENT MICROBIOLOGY, 57 643-646 (2008)
DOI 10.1007/s00284-008-9293-7
Citations Scopus - 34Web of Science - 29
Co-authors Ravi Naidu
2008 Caceres TC, Megharaj M, Naidu R, 'Degradation of fenamiphos in soils collected from different geographical regions: The influence of soil properties and climatic conditions', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 43 314-322 (2008)
DOI 10.1080/03601230801941659
Citations Scopus - 11Web of Science - 12
Co-authors Ravi Naidu
2008 Caceres TP, Megharaj M, Naidu R, 'Sorption of fenamiphos to different soils: The influence of soil properties', JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 43 605-610 (2008)
DOI 10.1080/03601230802234690
Citations Scopus - 3Web of Science - 2
Co-authors Ravi Naidu
2008 Chen Z, Wang W, Mallavarapu M, Naidu R, 'Comparison of no gas and He/H-2 cell modes used for reduction of isobaric interferences in selenium speciation by ion chromatography with inductively coupled plasma mass spectrometry', SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 63 69-75 (2008)
DOI 10.1016/j.sab.2007.11.019
Citations Scopus - 7Web of Science - 7
Co-authors Zuliang Chen, Ravi Naidu
2007 Chen ZL, Megharaj M, Naidu R, 'Determination of bromate and bromide in seawater by ion chromatography, with an ammonium salt solution as mobile phase, and inductively coupled plasma mass spectrometry', CHROMATOGRAPHIA, 65 115-118 (2007)
DOI 10.1365/s10337-006-0128-z
Citations Scopus - 26Web of Science - 23
Co-authors Ravi Naidu, Zuliang Chen
2007 Chen Z, Megharaj M, Naidu R, 'Speciation of chromium in waste water using ion chromatography inductively coupled plasma mass spectrometry', TALANTA, 72 394-400 (2007)
DOI 10.1016/j.talanta.2006.10.041
Citations Scopus - 50Web of Science - 49
Co-authors Zuliang Chen, Ravi Naidu
2007 Chen Z, Megharaj M, Naidu R, 'Speciation of iodate and iodide in seawater by non-suppressed ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 72 1842-1846 (2007)
DOI 10.1016/j.talanta.2007.02.014
Citations Scopus - 43Web of Science - 43
Co-authors Zuliang Chen, Ravi Naidu
2007 Chen Z, Megharaj M, Naidu R, 'Removal of interferences in the speciation of chromium using an octopole reaction system in ion chromatography with inductively coupled plasma mass spectrometry', TALANTA, 73 948-952 (2007)
DOI 10.1016/j.talanta.2007.05.030
Citations Scopus - 23Web of Science - 24
Co-authors Ravi Naidu, Zuliang Chen
2007 Caceres T, He W, Naidu R, Meharaj M, 'Toxicity of chlorpyrifos and TCP alone and in combination to Daphnia carinata: The influence of microbial degradation in natural water', WATER RESEARCH, 41 4497-4503 (2007)
DOI 10.1016/j.watres.2007.06.025
Citations Scopus - 44Web of Science - 41
Co-authors Ravi Naidu
2007 Caceres T, Megharaj M, Naidu R, 'Toxicity of fenamiphos and its metabolites to the cladoceran Daphnia carinata: The influence of microbial degradation in natural waters', CHEMOSPHERE, 66 1264-1269 (2007)
DOI 10.1016/j.chemosphere.2006.07.027
Citations Scopus - 19Web of Science - 19
Co-authors Ravi Naidu
2007 Chen Z, Megharaj M, Naidu R, 'Confirmation of iron complex formation using electrospray ionization mass spectrometry (ESI-MS) and sample stacking for analysis of iron polycarboxylate speciation by capillary electrophoresis', MICROCHEMICAL JOURNAL, 86 94-101 (2007)
DOI 10.1016/j.microc.2006.12.001
Citations Scopus - 15Web of Science - 14
Co-authors Zuliang Chen
2005 Ying GG, Kookana RS, Mallavarpu M, 'Release behavior of triazine residues in stabilised contaminated soils', Environmental Pollution, 134 71-77 (2005)

This paper reports the release behavior of two triazines (atrazine and simazine) in stabilised soils from a pesticide-contaminated site in South Australia. The soils were contamin... [more]

This paper reports the release behavior of two triazines (atrazine and simazine) in stabilised soils from a pesticide-contaminated site in South Australia. The soils were contaminated with a range of pesticides, especially with triazine herbicides. With multiple extractions of each soil sample with deionised water (eight in total), 15% of atrazine and 4% of simazine residues were recovered, resulting in very high concentrations of the two herbicides in leachate. The presence of small fractions of surfactants was found to further enhance the release of the residues. Methanol content up to 10% did not substantially influence the concentration of simazine and atrazine released. The study demonstrated that while the stabilisation of contaminated soil with particulate activated carbon (5%) and cement mix (15%) was effective in locking the residues of some pesticides, it failed to immobilise triazine herbicides residues completely. Given the higher water solubility of these herbicides than other compounds more effective strategies to immobilise their residues is needed. Stabilisation of contaminated soil with a mix of activated carbon and cement may fail to immobilise some contaminants like triazines. Crown Copyright © 2004 Published by Elsevier Ltd. All rights reserved.

DOI 10.1016/j.envpol.2004.07.016
Citations Scopus - 27
2005 Sethunathan N, Megharaj M, Smith L, Kamaludeen SPB, Avudainayagam S, Naidu R, 'Microbial role in the failure of natural attenuation of chromium(VI) in long-term tannery waste contaminated soil', AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 105 657-661 (2005)
DOI 10.1016/j.agee.2004.08.008
Citations Scopus - 33Web of Science - 30
Co-authors Ravi Naidu
2004 Singh N, Megharaj M, Gates WP, Churchman J, Kookana RS, Naidu R, Sethunathan N, 'Sorption-desorption of fenamiphos in surfactant-modified clays', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 72 276-282 (2004)
DOI 10.1007/s00128-003-8944-4
Citations Scopus - 7Web of Science - 7
Co-authors Ravi Naidu
2004 Sethunathan N, Megharaj M, Chen ZL, Williams BD, Lewis G, Naidu R, 'Algal degradation of a known endocrine disrupting insecticide, alpha-endosulfan, and its metabolite, endosulfan sulfate, in liquid medium and soil', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 52 3030-3035 (2004)
DOI 10.1021/jf035173x
Citations Scopus - 42Web of Science - 43
Co-authors Zuliang Chen, Ravi Naidu
2004 Krishnamurti GSR, Megharaj M, Naidu R, 'Bioavailability of cadmium-organic complexes to soil alga - An exception to the free ion model', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 52 3894-3899 (2004)
DOI 10.1021/jf035501t
Citations Scopus - 24Web of Science - 23
Co-authors Ravi Naidu
2004 Chen ZL, Megharaj M, Naidu R, 'Determination of tetrachloroethene, trichloroethylene, and their metabolites at trace levels in ground waters by on-line solid phase extraction/HPLC', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 27 885-896 (2004)
DOI 10.1081/JLC-120029705
Citations Scopus - 1Web of Science - 1
Co-authors Zuliang Chen, Ravi Naidu
2004 Kantachote D, Singleton I, Naidu R, McClure N, Megharaj M, 'Sodium application enhances DDT transformation in a long-term contaminated soil', WATER AIR AND SOIL POLLUTION, 154 115-125 (2004)
DOI 10.1023/B:WATE.0000022934.70231.1a
Citations Scopus - 10Web of Science - 9
Co-authors Ravi Naidu
2004 Kantachote D, Naidu R, Williams B, McClure N, Megharaj M, Singleton I, 'Bioremediation of DDT-contaminated soil: Enhancement by seaweed addition', JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, 79 632-638 (2004)
DOI 10.1002/jctb.1032
Citations Scopus - 21Web of Science - 21
Co-authors Ravi Naidu
2004 Edvantoro BB, Naidu R, Megharaj M, Merrington G, Singleton I, 'Microbial formation of volatile arsenic in cattle dip site soils contaminated with arsenic and DDT', APPLIED SOIL ECOLOGY, 25 207-217 (2004)
DOI 10.1016/j.apsoil.2003.09.006
Citations Scopus - 42Web of Science - 39
Co-authors Ravi Naidu
2004 Singh N, Megharaj M, Kookana RS, Naidu R, Sethunathan N, 'Atrazine and simazine degradation in Pennisetum rhizosphere', CHEMOSPHERE, 56 257-263 (2004)
DOI 10.1016/j.chemosphere.2004.03.010
Citations Scopus - 58Web of Science - 52
2004 Kamaludeen SPB, Megharaj M, Naidu R, Singleton I, Juhasz AL, Hawke BG, Sethunathan N, 'Microbial activity and phospholipid fatty acid pattern in long-term tannery waste-contaminated soil (vol 56, pg 302, 2003)', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 57 231-231 (2004)
DOI 10.1016/j.ecoenv.2003.12.001
2004 Ahmad R, Kookana RS, Megharaj M, Alston AM, 'Aging reduces the bioavailability of even a weakly sorbed pesticide (carbaryl) in soil', ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 23 2084-2089 (2004)
DOI 10.1897/03-569
Citations Scopus - 30Web of Science - 25
2003 Scott TL, Janusz A, Perkins MV, Megharaj M, Naidu R, Kirkbride KP, 'Effect of amphetamine precursors and by-products on soil enzymes of two urban soils', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 70 824-831 (2003)
DOI 10.1007/s00128-003-0056-7
Citations Scopus - 10Web of Science - 9
Co-authors Ravi Naidu
2003 Singh N, Megharaj M, Gates WP, Churchman GJ, Anderson J, Kookana RS, et al., 'Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 51 2653-2658 (2003)
DOI 10.1021/jf025978p
Citations Scopus - 40Web of Science - 38
Co-authors Ravi Naidu, Zuliang Chen
2003 Edvantoro BB, Naidu R, Megharaj M, Singleton I, 'Changes in microbial properties associated with long-term arsenic and DDT contaminated soils at disused cattle dip sites', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 55 344-351 (2003)
DOI 10.1016/S0147-6513(02)00092-1
Citations Scopus - 34Web of Science - 30
Co-authors Ravi Naidu
2003 Kamaludeen SPB, Megharaj M, Naidu R, Singleton I, Juhasz AL, Hawke BG, Sethunathan N, 'Microbial activity and phospholipid fatty acid pattern in long-term tannery waste-contaminated soil', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 56 302-310 (2003)
DOI 10.1016/S0147-6513(02)00075-1
Citations Scopus - 29Web of Science - 26
Co-authors Ravi Naidu
2003 Megharaj M, Singh N, Kookana RS, Naidu R, Sethunathan N, 'Hydrolysis of fenamiphos and its oxidation products by a soil bacterium in pure culture, soil and water', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 61 252-256 (2003)
DOI 10.1007/s00253-002-1206-2
Citations Scopus - 27Web of Science - 21
Co-authors Ravi Naidu
2003 Avudainayagam S, Megharaj A, Owens G, Kookana RS, Chittleborough D, Naidu R, 'Chemistry of chromium in soils with emphasis on tannery waste sites', REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 178, 178 53-91 (2003)
DOI 10.1007/0-387-21728-2_3
Citations Scopus - 66Web of Science - 54
Co-authors Ravi Naidu
2003 Megharaj M, Avudainayagam S, Naidu R, 'Toxicity of hexavalent chromium and its reduction by bacteria isolated from soil contaminated with tannery waste', CURRENT MICROBIOLOGY, 47 51-54 (2003)
DOI 10.1007/s00284-002-3889-0
Citations Scopus - 217Web of Science - 189
Co-authors Ravi Naidu
2003 Vig K, Megharaj M, Sethunathan N, Naidu R, 'Bioavailability and toxicity of cadmium to microorganisms and their activities in soil: a review', ADVANCES IN ENVIRONMENTAL RESEARCH, 8 121-135 (2003)
DOI 10.1016/S1093-0191(02)00135-1
Citations Scopus - 237Web of Science - 222
Co-authors Ravi Naidu
2003 Janusz A, Kirkbride KP, Scott TL, Naidu R, Perkins MV, Megharaj M, 'Microbial degradation of illicit drugs, their precursors, and manufacturing by-products: implications for clandestine drug laboratory investigation and environmental assessment', FORENSIC SCIENCE INTERNATIONAL, 134 62-71 (2003)
DOI 10.1016/S0379-0738(03)00110-5
Citations Scopus - 14Web of Science - 12
2003 Kantachote D, Singleton I, McClure N, Naidu R, Megharaj M, Harch BD, 'DDT resistance and transformation by different microbial strains isolated from DDT-contaminated soils and compost materials', COMPOST SCIENCE & UTILIZATION, 11 300-310 (2003)
Citations Scopus - 9Web of Science - 9
Co-authors Ravi Naidu
2002 Sethunathan N, Megharaj M, Chen Z, Singh N, Kookana RS, Naidu R, 'Persistence of endosulfan and endosulfan sulfate in soil as affected by moisture regime and organic matter addition', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 68 725-731 (2002)
DOI 10.1007/s00128-001-0314-5
Citations Scopus - 36Web of Science - 34
Co-authors Zuliang Chen, Ravi Naidu
2002 Chen ZL, Megharaj M, Naidu R, 'Comparison of adsorbents for on-line solid-phase extraction of polycyclic aromatic hydrocarbons before liquid chromatography with UV detection', CHROMATOGRAPHIA, 56 105-108 (2002)
DOI 10.1007/BF02490254
Citations Scopus - 4Web of Science - 4
Co-authors Ravi Naidu, Zuliang Chen
2002 Chen ZL, Megharaj M, Naidu R, 'On-line solid phase extraction of pesticide residues in natural water, coupled with liquid chromatography and UV detection, using various sorbents', JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES, 25 1779-1790 (2002)
DOI 10.1081/JLC-120005873
Citations Scopus - 2Web of Science - 1
Co-authors Ravi Naidu, Zuliang Chen
2001 Harris MA, Megharaj M, 'The effects of sludge and green manure on hydraulic conductivity and aggregation in pyritic mine tailings materials', ENVIRONMENTAL GEOLOGY, 41 285-296 (2001)
DOI 10.1007/s002540100434
Citations Scopus - 10Web of Science - 4
2000 Megharaj M, Singleton I, McClure NC, Naidu R, 'Influence of petroleum hydrocarbon contamination on microalgae and microbial activities in a long-term contaminated soil', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 38 439-445 (2000)
Citations Scopus - 91Web of Science - 74
Co-authors Ravi Naidu
2000 Megharaj M, Kantachote D, Singleton I, Naidu R, 'Effects of long-term contamination of DDT on soil microflora with special reference to soil algae and algal transformation of DDT', ENVIRONMENTAL POLLUTION, 109 35-42 (2000)
DOI 10.1016/S0269-7491(99)00231-6
Citations Scopus - 69Web of Science - 69
Co-authors Ravi Naidu
1999 Megharaj M, Singleton I, Kookana R, Naidu R, 'Persistence and effects of fenamiphos on native algal populations and enzymatic activities in soil', SOIL BIOLOGY & BIOCHEMISTRY, 31 1549-1553 (1999)
DOI 10.1016/S0038-0717(99)00078-4
Citations Scopus - 63Web of Science - 54
Co-authors Ravi Naidu
1999 Megharaj M, Boul HL, Thiele JH, 'Effects of DDT and its metabolites on soil algae and enzymatic activity', BIOLOGY AND FERTILITY OF SOILS, 29 130-134 (1999)
DOI 10.1007/s003740050534
Citations Scopus - 33Web of Science - 28
1998 Mallavarapu M, Mohler I, Kruger M, Hosseini MM, Bartels F, Timmis KN, Holtel A, 'Genetic requirements for the expression of benzylamine dehydrogenase activity in Pseudomonas putida', FEMS MICROBIOLOGY LETTERS, 166 109-114 (1998)
Citations Scopus - 4Web of Science - 1
1998 Megharaj M, Singleton I, McClure NC, 'Effect of pentachlorophenol pollution towards microalgae and microbial activities in soil from a former timber processing facility', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 61 108-115 (1998)
Citations Scopus - 31Web of Science - 32
1998 Megharaj M, Hartmans S, Engesser KH, Thiele JH, 'Recalcitrance of 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene to degradation by pure cultures of 1,1-diphenylethylene-degrading aerobic bacteria', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 49 337-342 (1998)
Citations Scopus - 8Web of Science - 6
1997 Blasco R, Mallavarapu M, Wittich RM, Timmis KN, Pieper DH, 'Evidence that formation of protoanemonin from metabolites of 4-chlorobiphenyl degradation negatively affects the survival of 4-chlorobiphenyl-cometabolizing microorganisms', APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 63 427-434 (1997)
Citations Scopus - 48Web of Science - 33
1997 Megharaj M, Jovcic A, Boul HL, Thiele JH, 'Recalcitrance of 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) to cometabolic degradation by pure cultures of aerobic and anaerobic bacteria', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 33 141-146 (1997)
Citations Scopus - 16Web of Science - 14
1997 Megharaj M, Wittich RM, Blasco R, Pieper DH, Timmis KN, 'Superior survival and degradation of dibenzo-p-dioxin and dibenzofuran in soil by soil-adapted Sphingomonas sp strain RW1', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 48 109-114 (1997)
Citations Scopus - 47Web of Science - 42
1997 Megharaj M, Garthwaite I, Thiele JH, 'Total biodegradation of the oestrogenic mycotoxin zearalenone by a bacterial culture', LETTERS IN APPLIED MICROBIOLOGY, 24 329-333 (1997)
DOI 10.1046/j.1472-765X.1997.00053.x
Citations Scopus - 43Web of Science - 37
1995 BLASCO R, WITTICH RM, MALLAVARAPU M, TIMMIS KN, PIEPER DH, 'FROM XENOBIOTIC TO ANTIBIOTIC, FORMATION OF PROTOANEMONIN FROM 4-CHLOROCATECHOL BY ENZYMES OF THE 3-OXOADIPATE PATHWAY', JOURNAL OF BIOLOGICAL CHEMISTRY, 270 29229-29235 (1995)
Citations Scopus - 82Web of Science - 86
1994 MEGHARAJ M, MADHAVI DR, SREENIVASULU C, UMAMAHESWARI A, VENKATESWARLU K, 'BIODEGRADATION OF METHYL PARATHION BY SOIL ISOLATES OF MICROALGAE AND CYANOBACTERIA', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 53 292-297 (1994)
Citations Scopus - 40Web of Science - 37
1993 MEGHARAJ M, RAO AS, VENKATESWARLU K, 'INFLUENCE OF RICE STRAW AMENDMENT ON PERSISTENCE AND ALGAL TOXICITY OF P-NITROPHENOL IN SOIL', SOIL BIOLOGY & BIOCHEMISTRY, 25 1185-1188 (1993)
DOI 10.1016/0038-0717(93)90213-U
Citations Scopus - 5Web of Science - 5
1993 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'TOXICITY OF CARBOFURAN TO SOIL ISOLATES OF CHLORELLA-VULGARIS, NOSTOC-LINCKIA AND N-MUSCORUM', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 39 644-648 (1993)
Citations Scopus - 9Web of Science - 10
1993 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'PHYSIOLOGICAL AND MORPHOLOGICAL ALTERATIONS INDUCED BY CARBARYL AND 1-NAPHTHOL COMBINATIONS IN NOSTOC-LINCKIA ISOLATED FROM SOIL', CURRENT MICROBIOLOGY, 27 41-45 (1993)
DOI 10.1007/BF01576832
Citations Scopus - 2Web of Science - 2
1992 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'EFFECTS OF PHENOLIC-COMPOUNDS ON GROWTH AND METABOLIC-ACTIVITIES OF CHLORELLA-VULGARIS AND SCENEDESMUS-BIJUGATUS ISOLATED FROM SOIL', PLANT AND SOIL, 140 25-34 (1992)
DOI 10.1007/BF00012803
Citations Scopus - 21Web of Science - 22
1992 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'REMOVAL OF NITROGEN AND PHOSPHORUS BY IMMOBILIZED CELLS OF CHLORELLA-VULGARIS AND SCENEDESMUS-BIJUGATUS ISOLATED FROM SOIL', ENZYME AND MICROBIAL TECHNOLOGY, 14 656-658 (1992)
DOI 10.1016/0141-0229(92)90042-M
Citations Scopus - 30Web of Science - 26
1991 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'TOXICITY OF PARAAMINOPHENOL AND PARA-NITROPHENOL TO CHLORELLA-VULGARIS AND 2 SPECIES OF NOSTOC ISOLATED FROM SOIL', PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY, 40 266-273 (1991)
DOI 10.1016/0048-3575(91)90098-7
Citations Scopus - 11Web of Science - 11
1991 MEGHARAJ M, PEARSON HW, VENKATESWARLU K, 'TOXICITY OF PHENOL AND 3 NITROPHENOLS TOWARDS GROWTH AND METABOLIC-ACTIVITIES OF NOSTOC-LINCKIA, ISOLATED FROM SOIL', ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 21 578-584 (1991)
Citations Scopus - 49Web of Science - 51
1990 MEGHARAJ M, RAO AP, RAO AS, VENKATESWARLU K, 'INTERACTION EFFECTS OF CARBARYL AND ITS HYDROLYSIS PRODUCT, 1-NAPHTHOL, TOWARDS 3 ISOLATES OF MICROALGAE FROM RICE SOIL', AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 31 293-300 (1990)
DOI 10.1016/0167-8809(90)90228-6
Citations Scopus - 19Web of Science - 20
1989 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'INTERACTION EFFECTS OF INSECTICIDE COMBINATIONS ON THE GROWTH OF SCENEDESMUS-BIJUGATUS AND SYNECHOCOCCUS-ELONGATUS', PLANT AND SOIL, 114 159-163 (1989)
DOI 10.1007/BF02220794
Citations Scopus - 11Web of Science - 12
1989 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'THE USE OF UNICELLULAR SOIL GREEN-ALGAE FOR INSECTICIDE BIOASSAY', JOURNAL OF MICROBIOLOGICAL METHODS, 10 119-122 (1989)
DOI 10.1016/0167-7012(89)90008-0
Citations Scopus - 4Web of Science - 4
1989 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'EFFECTS OF CARBOFURAN AND CARBARYL ON THE GROWTH OF A GREEN-ALGA AND 2 CYANOBACTERIA ISOLATED FROM A RICE SOIL', AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 25 329-336 (1989)
DOI 10.1016/0167-8809(89)90129-1
Citations Scopus - 15Web of Science - 15
1988 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'EFFECT OF INSECTICIDES AND PHENOLICS ON NITROGEN-FIXATION BY NOSTOC-LINCKIA', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 41 277-281 (1988)
Citations Scopus - 16Web of Science - 15
1988 MEGHARAJ M, VIJAYALAKSHMI M, VENKATESWARLU K, RAO AS, 'HETEROTROPHIC NITRIFICATION BY FUSARIUM SPECIES ISOLATED FROM FIELDS WITH COTTON CROP', CURRENT SCIENCE, 57 387-388 (1988)
1988 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'TOLERANCE OF ALGAL POPULATION IN RICE SOIL TO CARBOFURAN APPLICATION', CURRENT SCIENCE, 57 100-102 (1988)
Citations Web of Science - 9
1988 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'MICROBIAL-DEGRADATION AND ALGAL TOXICITY OF MONOCROTOPHOS AND QUINALPHOS IN FLOODED SOIL', CHEMOSPHERE, 17 1033-1039 (1988)
DOI 10.1016/0045-6535(88)90073-2
Citations Scopus - 13Web of Science - 15
1988 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'INFLUENCE OF GLUCOSE AMENDMENT ON THE TOXICITY OF 2 NITROPHENOLS TO CHLORELLA-VULGARIS', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 15 320-323 (1988)
DOI 10.1016/0147-6513(88)90086-3
Citations Scopus - 5Web of Science - 5
1987 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'METABOLISM OF MONOCROTOPHOS AND QUINALPHOS BY ALGAE ISOLATED FROM SOIL', BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 39 251-256 (1987)
Citations Scopus - 52Web of Science - 49
1987 MEGHARAJ M, RAO AP, VENKATESWARLU K, RAO AS, 'INFLUENCE OF PARTHENIUM-HYSTEROPHORUS L ON NATIVE SOIL ALGAL FLORA', PLANT AND SOIL, 101 223-226 (1987)
DOI 10.1007/BF02370648
Citations Scopus - 1Web of Science - 1
1987 MEGHARAJ M, RAO AP, VENKATESWARLU K, RAO AS, 'TOXICITY OF PARTHENIUM-HYSTEROPHORUS EXTRACTS TO CHLORELLA-VULGARIS AND SYNECHOCOCCUS-ELONGATUS', PLANT AND SOIL, 103 292-294 (1987)
DOI 10.1007/BF02370405
Citations Scopus - 3Web of Science - 2
1987 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'INFLUENCE OF CYPERMETHRIN AND FENVALERATE ON A GREEN-ALGA AND 3 CYANOBACTERIA ISOLATED FROM SOIL', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 14 142-146 (1987)
DOI 10.1016/0147-6513(87)90056-X
Citations Scopus - 13Web of Science - 13
1986 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'THE TOXICITY OF PHENOLIC-COMPOUNDS TO SOIL ALGAL POPULATION AND TO CHLORELLA-VULGARIS AND NOSTOC-LINCKIA', PLANT AND SOIL, 96 197-203 (1986)
DOI 10.1007/BF02374764
Citations Scopus - 17Web of Science - 15
1986 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'EFFECT OF MONOCROTOPHOS AND QUINALPHOS ON SOIL ALGAE', ENVIRONMENTAL POLLUTION SERIES A-ECOLOGICAL AND BIOLOGICAL, 40 121-126 (1986)
DOI 10.1016/0143-1471(86)90079-6
Citations Scopus - 15Web of Science - 18
1986 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'GROWTH-RESPONSE OF 4 SPECIES OF SOIL ALGAE TO MONOCROTOPHOS AND QUINALPHOS', ENVIRONMENTAL POLLUTION SERIES A-ECOLOGICAL AND BIOLOGICAL, 42 15-22 (1986)
DOI 10.1016/0143-1471(86)90041-3
Citations Scopus - 30Web of Science - 31
1986 MEGHARAJ M, VENKATESWARLU K, RAO AS, 'INFLUENCE OF CYPERMETHRIN AND FENVALERATE ON NATURAL SOIL ALGAL POPULATIONS', ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 12 141-145 (1986)
DOI 10.1016/0147-6513(86)90050-3
Citations Scopus - 5Web of Science - 6
Show 341 more journal articles

Conference (26 outputs)

Year Citation Altmetrics Link
2017 Wijayawardena AMA, Naidu R, Mallavarapu M, Lamb D, Palanisami T, Kuchel T, 'Can lead enter independently in the presence of zinc into human body? A study on effect of zinc on lead bioavailability', Melbourne, Australia (2017)
Co-authors Ravi Naidu, Dane Lamb, Thava Palanisami, Ayanka Wijayawardena
2016 Subramaniyam V, Subashchandrabose SR, Thavamani P, Mallavarapu M, Chen Z, Naidu R, 'Effect of iron chloride precursor on synthesis of stable iron nanoparticles for chromium remediation', Canberra, Australia (2016)
Co-authors Thava Palanisami, Ravi Naidu, Suresh Subashchandrabose
2016 Peng C, Xia Q, Muthusamy S, Lal V, Ng J, Lamb D, et al., 'Metal interaction on arsenic toxicity in both in vivo and in vitro biological systems including human cells' (2016)
DOI 10.1201/b20466-159
Co-authors Ravi Naidu, Dane Lamb
2015 Ganesh VK, Subashchandrabose SR, Mallavarapu M, Naidu R, 'Microalgal biomass production and piggery wastewater remediation ¿ Using the soil isolates of Chlamydomonas sp. and Desmodesmus sp.', Melbourne, Australia (2015)
Co-authors Suresh Subashchandrabose, Ravi Naidu
2015 Subramaniyam V, Subashchandrabose SR, Thavamani P, Mallavarapu M, Chen Z, Naidu R, 'Algal Biomass After Bioremediation ¿ An Economical Source for Biosynthesis of Iron Nanoparticles', Melbourne, Australia (2015)
Co-authors Ravi Naidu, Thava Palanisami, Suresh Subashchandrabose
2015 Subashchandrabose SR, Mallavarapu M, Naidu R, 'Computational analyses on the interaction of mononitrophenols on Rhodococcus wratislaviensis 4-NP monooxygenase', Melbourne (2015)
Co-authors Ravi Naidu, Suresh Subashchandrabose
2015 Palanisami T, Ramadass K, Smith E, Mallavarapu M, Srivastava P, Naidu R, 'Challenges in Real Field Implementation of Risk Based Land Management Approach: a Case Study Involving Weathered Hydrocarbons', Clean up 2015: 6th International Contmainated Site Remediation Conference: Proceedings, Melbourne (2015) [E2]
Co-authors Ravi Naidu, Thava Palanisami
2015 Palanisami T, Mallavarapu M, Naidu RAVI, 'Contaminants of emerging concern in the coastal zone: the need for new monitoring,assessment and management strategies', Great Lakes, NSW (2015) [O1]
Co-authors Ravi Naidu, Thava Palanisami
2014 Ganeshkumar V, Subashchandrabose SR, Mallavarapu M, Naidu R, 'Nutrient removal and lipid accumulation by soil micro alga Chlorella sp. MM3 grown on piggery and winery wastewater mixture', Sydney (2014)
Co-authors Ravi Naidu, Suresh Subashchandrabose
2014 Wang Z, Yu C, Fang C, Megharaj M, 'Removal of acid red 94 and methylene blue using iron-polyphenol nanomaterials synthesized by various plant leaves: a comparison study', 2014 INTERNATIONAL CONFERENCE ON NANOSCIENCE AND NANOTECHNOLOGY (ICONN), Adelaide, AUSTRALIA (2014)
Citations Scopus - 1
Co-authors Cheng Fang
2014 Fang C, Wang Z, Mallavarapu M, Naidu R, 'Self-assembling of nanocubes and nanoparticles', 2014 INTERNATIONAL CONFERENCE ON NANOSCIENCE AND NANOTECHNOLOGY (ICONN), Adelaide, AUSTRALIA (2014)
Co-authors Cheng Fang, Ravi Naidu
2014 Kader M, Lamb DT, Megharaj M, Naidu R, 'Does cadmium influence arsenic phytotoxicity?', One Century of the Discovery of Arsenicosis in Latin America (1914-2014): As 2014 - Proceedings of the 5th International Congress on Arsenic in the Environment (2014)

Arsenic (As) and Cadmium (Cd) phytotoxicity was studied individually and as a mixture in solution as well as in soil. The effective concentrations causing a 50% reduction in growt... [more]

Arsenic (As) and Cadmium (Cd) phytotoxicity was studied individually and as a mixture in solution as well as in soil. The effective concentrations causing a 50% reduction in growth for root elongation to pot study was significantly varied though having significant correlation. The interaction of As and Cd was antagonistic in solution. In addition, As toxicity was significantly negatively affected in soil. The reduced binding ability of acidic soils for Cd may have impacted As phytotoxicity as the binding constant is 3-4 times less in alkaline soil. © 2014 Taylor & Francis Group.

Co-authors Dane Lamb, Ravi Naidu
2014 Lamb DT, Kader M, Megharaj M, Naidu R, 'Arsenic phytotoxicity in Australian soils', One Century of the Discovery of Arsenicosis in Latin America (1914-2014): As 2014 - Proceedings of the 5th International Congress on Arsenic in the Environment (2014)

Arsenic phytotoxicity was studied using two tests in a range of soils. The effective concentrations causing a 50% reduction in growth (EC 50 ) for the 4 week growth study was 13 t... [more]

Arsenic phytotoxicity was studied using two tests in a range of soils. The effective concentrations causing a 50% reduction in growth (EC 50 ) for the 4 week growth study was 13 to 235 mg/kg compared to 42 to 452 mg/kg using root elongation. Phytotoxicity thresholds for both tests were strongly correlated to each other. The EC 50 values were related strongly to soil pH and the Freundlich partitioning (K f ) constants. The EC 50 values were most consistently related to K f values. © 2014 Taylor & Francis Group.

Co-authors Dane Lamb, Ravi Naidu
2013 Wijayawardena AMA, Mallavarapu M, Naidu R, 'Bioavailability and Toxicity of Lead to Earthworms in Three Soils', CleanUp 2013: 5th International Contaminated Site Remediation Conference, Melbourne, Australia (2013)
Co-authors Ayanka Wijayawardena, Ravi Naidu
2012 Arias V, Megharaj M, Naidu R, Mallavarapu M, 'Assessment of clay minerals based materials for AFFF removal', ICYRAM 2012, Singapore (2012)
Co-authors Ravi Naidu
2012 Gabesh VK, Subashchandrabose SR, Mallavarapu M, Naidu R, 'Characterization of soil microalgae for remediation and biofuel production', Adelaide, Australia (2012)
Co-authors Suresh Subashchandrabose, Ravi Naidu
2012 Wijayawardena MAA, Megharaj M, Naidu R, 'Bioavailability and toxicity of arsenic to earthworms in three soils', Understanding the Geological and Medical Interface of Arsenic, As 2012 - 4th International Congress: Arsenic in the Environment (2012)

The acute toxicity of arsenate [As(V)] and arsenite [As(III)] to the earthworm Eisenia fetida was studied in three different soils in order to provide basic toxicity and bioavail... [more]

The acute toxicity of arsenate [As(V)] and arsenite [As(III)] to the earthworm Eisenia fetida was studied in three different soils in order to provide basic toxicity and bioavailability data for formulating risk characterization benchmarks. Arsenic biotransformation in earthworms was also investigated to understand the mechanisms by which these organisms mitigate arsenic toxicity. Arsenic was more toxic to earthworms in acidic soil than in the alkaline soil. Earthworms transformed As(V) to more toxic As(III) which has implications to soil health. © 2012 Taylor & Francis Group.

Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Ayanka Wijayawardena
2012 Bahar MM, Megharaj M, Naidu R, 'Oxidation of arsenic (III) by a Stenotrophomonas sp. isolated from soil', Understanding the Geological and Medical Interface of Arsenic, As 2012 - 4th International Congress: Arsenic in the Environment (2012)

The involvement of microorganism in global cycling of arsenic is well-known. Arsenite-oxidizing bacteria play an important role in reducing arsenic toxicity and mobility in arseni... [more]

The involvement of microorganism in global cycling of arsenic is well-known. Arsenite-oxidizing bacteria play an important role in reducing arsenic toxicity and mobility in arsenic contaminated environment. In this study, a gram negative bacterium, MM-7 able to efficiently oxidize arsenite [As (III)] to arsenate [As (V)] was isolated from soil. The 16S rRNA analysis revealed that the strain is a close relative to Stenotrophomonas panacihumi with 99% identity. The presence of the arsenite oxidase gene was detected in this bacterium. The amino acid sequences of the arsenite oxidase from MM-7 showed the highest identity with the arsenite oxidase from Bosea sp. (67%). To our knowledge, this is the first report of As (III) oxidation by Stenotrophomonas sp. This strain has great potential for remediation of arsenic contaminated water. © 2012 Taylor & Francis Group.

Co-authors Mezbaul Bahar, Ravi Naidu
2012 Megharaj M, Bahar MM, Naidu R, 'Bioremediation of arsenic contaminated water: Prospects and recent advances', Understanding the Geological and Medical Interface of Arsenic, As 2012 - 4th International Congress: Arsenic in the Environment (2012)

Arsenic contamination of groundwater and surface water is widespread throughout the world. Due to its carcinogenicity and toxicity to human and animal health, remediation of arsen... [more]

Arsenic contamination of groundwater and surface water is widespread throughout the world. Due to its carcinogenicity and toxicity to human and animal health, remediation of arsenic contaminated water has become a high priority. There are several physico-chemical based conventional technologies available for arsenic removal from water. However, these technologies have some limitations such as high cost, generation of toxic by-products etc. Therefore, research on sustainable and cost-effective arsenic removal technologies for water has gained enormous attention recently. This paper will focus on the state-of-art knowledge on the currently available arsenic remediation methods, their prospects and recent advances with particular emphasis on bioremediation approaches. © 2012 Taylor & Francis Group.

Co-authors Mezbaul Bahar, Ravi Naidu
2011 Arias V, Rachakonda PK, Perso F, Naidu R, Mallavarapu M, 'Before and after purge sampling, is there any difference?', 4th International Contaminated Site Remediation Conference. Program and Proceedings, Adelaide, Australia (2011)
Co-authors Ravi Naidu
2010 Rahman MM, Megharaj M, Naidu R, Asaduzzaman M, 'Arsenic exposure from drinking water and rice in the Noakhali district of Bangladesh', Arsenic in Geosphere and Human Diseases, As 2010 - 3rd International Congress: Arsenic in the Environment (2010)
Co-authors Mahmud Rahman, Ravi Naidu
2002 Kookana RS, Sadler R, Connell D, Sethunathan N, Megharaj M, Juhasz A, et al., 'Organic contaminants in soil environment - Environmental fate, impacts and remediation', ENVIRONMENTAL PROTECTION AND RISK ASSESSMENT OF ORGANIC CONTAMINANTS, NEW DELHI, INDIA (2002)
Co-authors Ravi Naidu
2002 Raghu K, Sethunathan N, Singh N, Megharaj M, Kookana RS, Naidu R, 'Wetland rice ecosystem: A favourable environment for pesticide biodegradation', ENVIRONMENTAL PROTECTION AND RISK ASSESSMENT OF ORGANIC CONTAMINANTS, NEW DELHI, INDIA (2002)
Co-authors Ravi Naidu
1998 Singleton I, McClure NC, Bentham R, Xie P, Kantachote D, Megharaj M, et al., 'Bioremediation of organochlorine-contaminated soil in South Australia: A collaborative venture', SEEKING AGRICULTURAL PRODUCE FREE OF PESTICIDE RESIDUES, YOGYAKARTA, INDONESIA (1998)
Citations Web of Science - 1
Co-authors Ravi Naidu
1998 Megharaj M, Blasco R, Wittich RM, Pieper DH, Timmis KN, 'The need for PCB-mineralising organisms', SEEKING AGRICULTURAL PRODUCE FREE OF PESTICIDE RESIDUES, YOGYAKARTA, INDONESIA (1998)
1996 Hofer B, Blasco R, Megharaj M, Seeger M, McKay D, Wittich RM, et al., 'Pseudomonads designed for bioremediation and circumvention of undesirable routes', MOLECULAR BIOLOGY OF PSEUDOMONADS, TSUKUBA, JAPAN (1996)
Citations Web of Science - 6
Show 23 more conferences

Patent (1 outputs)

Year Citation Altmetrics Link
2012 Wang L, Naidu R, Chen Z, mallavarapu M, Analyte Ion Detection Method and Device (2012)
Co-authors Zuliang Chen, Liang Wang, Ravi Naidu
Edit

Grants and Funding

Summary

Number of grants 27
Total funding $5,128,024

Click on a grant title below to expand the full details for that specific grant.


20174 grants / $330,308

Green Remediation technology for a recalcitrant and persistent hydrocarbon (1,4 dioxane being case example)$155,154

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Suresh Subashchandrabose, Professor Megh Mallavarapu, Professor Ravi Naidu
Scheme Research Project
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700318
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Risk based management of petroleum hydrocarbon contaminated groundwater$155,154

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Professor Megh Mallavarapu, Doctor Logeshwaran Panneerselvan, Professor Ravi Naidu, Dr Sreenivasulu Chadalavada
Scheme Research Project
Role Lead
Funding Start 2017
Funding Finish 2018
GNo G1700320
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Nutrient Cycling in Restored Ecosystems$15,000

Funding body: Ravensworth Operations Pty Limited

Funding body Ravensworth Operations Pty Limited
Project Team Doctor Carmen Castor, Doctor Anita Chalmers, Professor Megh Mallavarapu, Doctor Suresh Subashchandrabose, Mr Robert Scanlon
Scheme Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1701594
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

Nutrient Cycling in Restored Ecosystems$5,000

Funding body: Eastern Creek Operations Pty limited

Funding body Eastern Creek Operations Pty limited
Project Team Doctor Carmen Castor, Doctor Anita Chalmers, Professor Megh Mallavarapu, Doctor Suresh Subashchandrabose, Mr Robert Scanlon
Scheme Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1701589
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

20163 grants / $160,000

Integrated facility to assess nano-particles risk to environment and humans$150,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Professor Megh Mallavarapu, Bush, Prof Richard, Professor Nanthi Bolan, Associate Professor Zuliang Chen, Vigneswaren, Prof Saravanamuthu, Shon, A/Prof Ho Kyong, Rahman, Dr Mohammad Mahmudur, Dharmarajan, Dr Rajarathnam, Stephan, Dr Chady
Scheme Equipment Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1500541
Type Of Funding Internal
Category INTE
UON Y

Research pre-feasibility study on the sensor technology for monitoring air pollutants and wastewater$5,000

Funding body: Infratech Industries Pty Ltd

Funding body Infratech Industries Pty Ltd
Project Team Professor Megh Mallavarapu
Scheme Research Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1600446
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

Research pre-feasibility study on microbial technologies for removal of nutrients in waste water treatment$5,000

Funding body: Infratech Industries Pty Ltd

Funding body Infratech Industries Pty Ltd
Project Team Professor Megh Mallavarapu, Doctor Suresh Subashchandrabose
Scheme Research Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1600473
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

20153 grants / $361,229

Biosensor for Monitoring Natural Attenuation of Benzene in Groundwater$346,722

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Kannan Krishnan, Professor Megh Mallavarapu, Professor Ravi Naidu
Scheme Research Project
Role Investigator
Funding Start 2015
Funding Finish 2017
GNo G1501242
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

PERSISTENT ORGANIC POLLUTANTS in WATER, SEDIMENT and BIOTA$8,000

Funding body: Lake Macquarie City Council

Funding body Lake Macquarie City Council
Project Team Doctor Kannan Krishnan, Doctor Logeshwaran Panneerselvan, Doctor Suresh Subashchandrabose, Doctor Thava Palanisami, Professor Megh Mallavarapu
Scheme Lake Macquarie Environmental Research Grant
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1600058
Type Of Funding Other Public Sector - Local
Category 2OPL
UON Y

Microplastics in Lake Macquarie: Distribution, Characteristics $6,507

Funding body: Lake Macquarie City Council

Funding body Lake Macquarie City Council
Project Team Doctor Thava Palanisami, Doctor Suresh Subashchandrabose, Doctor Logeshwaran Panneerselvan, Doctor Kannan Krishnan, Professor Megh Mallavarapu
Scheme Lake Macquarie Environmental Research Grant
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1600173
Type Of Funding Other Public Sector - Local
Category 2OPL
UON Y

20121 grants / $501,296

Biosensor and enzymatic remediation approaches for carcinogenic Benzo-a-pyrene$501,296

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team

Megharaj Mallavarapu, Suresh R Subhashchandrabose, Ravi Naidu

Scheme Research Project
Role Lead
Funding Start 2012
Funding Finish 2015
GNo
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON N

20111 grants / $1,720,696

Assessing the risk to human health and the environment from mixed contamination$1,720,696

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team

Megharaj Mallavarapu, Jack Ng, Ravi Naidu

Scheme Research Project
Role Lead
Funding Start 2011
Funding Finish 2015
GNo
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON N

20101 grants / $11,000

Estimation of bioaccessibility/bioavailability of arsenic to humans and earthworm in soil samples supplied by TMK$11,000

Funding body: TMK Eng. Pty Ltd.

Funding body TMK Eng. Pty Ltd.
Scheme Consultancy
Role Lead
Funding Start 2010
Funding Finish 2011
GNo
Type Of Funding External
Category EXTE
UON N

20081 grants / $21,000

Dissolution of Hematite in Seawater and its Potential Impact on Phytoplankton growth$21,000

Funding body: Centrix Metals Ltd.

Funding body Centrix Metals Ltd.
Project Team

Megharaj Mallavarapu, Dane Lamb, Hui Ming, Binoy Sarkar

Scheme Consultancy
Role Lead
Funding Start 2008
Funding Finish 2008
GNo
Type Of Funding External
Category EXTE
UON N

20062 grants / $339,014

Illicit drug laboratories and the environment$332,249

Funding body: National Drug Law Enforcement Research Fund

Funding body National Drug Law Enforcement Research Fund
Project Team

M. Mallavarapu, K.P. Kirkbride, R. Naidu, M. Perkins, G. Klass, K. Evans, D. Edmonds

Scheme National Drug Law Enforcement Research Fund
Role Investigator
Funding Start 2006
Funding Finish 2009
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Metal Levels for Inclusion in the Australian Standard for Compostability/Biodegradability$6,765

Funding body: Department of Environment and Heritage, Canberra

Funding body Department of Environment and Heritage, Canberra
Project Team

Megharaj Mallavarapu, Gary Owens, Ravi Naidu

Scheme Research
Role Lead
Funding Start 2006
Funding Finish 2006
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

20053 grants / $45,000

Role of algae in pollutant detoxification-ARC Seed Fund$25,000

Funding body: University of South Australia

Funding body University of South Australia
Project Team

Megharaj Mallavarapu and Ravi Naidu

Scheme ARC Seed Fund
Role Lead
Funding Start 2005
Funding Finish 2005
GNo
Type Of Funding Internal
Category INTE
UON N

Ecotoxicity Assessment of a Former Cement Factory Site$14,000

Funding body: ERM Pty Ltd.

Funding body ERM Pty Ltd.
Project Team

Megharaj Mallavarapu, Ravi Naidu

Scheme Consultancy
Role Lead
Funding Start 2005
Funding Finish 2005
GNo
Type Of Funding External
Category EXTE
UON N

Ecotoxicity Assessment of Lismore Railway Site$6,000

Funding body: JBS Environmental Pty Ltd.

Funding body JBS Environmental Pty Ltd.
Project Team

Megharaj Mallavarapu, Ravi Naidu

Scheme Consultancy
Role Lead
Funding Start 2005
Funding Finish 2005
GNo
Type Of Funding External
Category EXTE
UON N

20046 grants / $1,618,081

Contamination assessment and remediation of a DOD site$500,000

Funding body: Department of Defence

Funding body Department of Defence
Project Team

Ravi Naidu and Megharaj Mallavarapu

Scheme Research project
Role Investigator
Funding Start 2004
Funding Finish 2004
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

Contamination assessment and remediation options for a Defence site$480,000

Funding body: Department of Defence

Funding body Department of Defence
Project Team

Ravi Naidu and Megharaj Mallavarapu

Scheme Research project
Role Investigator
Funding Start 2004
Funding Finish 2004
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

Heavy metal phytotoxicity in longterm contaminated soils: Implications for the development of Australian regulatory guidelines and realistic environmental risk assessment.$378,081

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Scheme Linkage Projects
Role Investigator
Funding Start 2004
Funding Finish 2007
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Environmental impacts evaluation of AFFF$185,000

Funding body: Department of Defence

Funding body Department of Defence
Project Team

Megharaj Mallavarapu and Ravi Naidu

Scheme Research project
Role Investigator
Funding Start 2004
Funding Finish 2004
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

Impact of petroleum hydrocarbon spill on stream health$50,000

Funding body: Department of Defence

Funding body Department of Defence
Project Team

Megharaj Mallavarapu and Ravi Naidu

Scheme Research project
Role Lead
Funding Start 2004
Funding Finish 2004
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

Phytotoxicity assessment of Zinc Contaminated site, Coorabong$25,000

Funding body: Geotechniques Pty Ltd.

Funding body Geotechniques Pty Ltd.
Project Team

Megharaj Mallavarapu, Ravi Naidu, Gary Owens

Scheme Consultancy
Role Lead
Funding Start 2004
Funding Finish 2004
GNo
Type Of Funding External
Category EXTE
UON N

20032 grants / $20,400

Phytotoxicity Assessment of a Sanitary Contaminated Site$16,000

Funding body: URS Australia Pty Ltd.

Funding body URS Australia Pty Ltd.
Project Team

Megharaj Mallavarapu, Gary owens, Ravi Naidu

Scheme Consultancy
Role Lead
Funding Start 2003
Funding Finish 2004
GNo
Type Of Funding External
Category EXTE
UON N

Profiles of Toxic Species of Cyanobacterium and the impact of Proposed Integrated Aquaculture and Wastewater Treatment at Bolivar Wastewater Lagoons$4,400

Funding body: ReinvestSA

Funding body ReinvestSA
Project Team

Megharaj Mallavarapu

Scheme Consultancy
Role Lead
Funding Start 2003
Funding Finish 2003
GNo
Type Of Funding External
Category EXTE
UON N
Edit

Research Supervision

Number of supervisions

Completed33
Current22

Total current UON EFTSL

PhD9.35

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2017 PhD An Investigation into the Occurrence of Vegetation Stalling in Mining Areas Within the Hunter Valley PhD (Environmental Sc), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Environmentally relevant risk assessment of microplastics and complex chemical mixtures in Marine Environment: Implications for Trophic Transfer and Human Health PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Study of Anaerobic Degradation of Polycyclic Aromatic Hydrocarbons in Contaminated Coastal Marine Sediments by Improved Enrichment Culture and Combined Genomic-Proteomic Approaches PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Deploying Multiomics Approaches as Diagnostic Tools for Rapid Risk Assessment in Mine Soil Contaminated Sites PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Degradation of Lignocellulose Waste by Using Bacterial Cellulases PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Risk Assessment of Australian Biosolids Containing Perfluoroalkyl Substances (PFAS) Applied to Agricultural Land PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD The Polymer Types of the Nanoplastics Particles in Wastewater, Sludge and Soil PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Microplastics as an emerging contaminant in wastewater treatment plants PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Life in Plastisphere: Unravelling the interaction of microorganisms with microplastics PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Beyond the Obvious: Risk Assessment of Contaminant Transformation Products and Metabolites PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Agriculture Wasterwater-Grown Microalgae for Aquaculture Feed Production PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Pesticide Use and Food Safety PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Understanding the Mechanism of Alzheimer's Disease by PFOS Induced Transcriptome Changes in Eisenia Fetida PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Effect of Polycyclic Aromatic Hydrocarbons on Gut Microflora Dynamics in Mouse PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Algal Bacterial Interaction in the Soil Ecosystem PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2017 PhD Bioavailability and Toxicity of Metalloids in Mixed Contaminant Environments using Australian Native Plants PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD PFOS Interaction with Nucleoside Diphosphate Kinase Could Cause Alzheimer's Disease PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2016 PhD Coupling Modified Bamboo Charcoal Immobilized Bacteria and Fenton Oxidation by Iron Based Nanoparticles for the Remediation of Antibiotic-Amoxicillin PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2016 PhD Exploring the Development of Biorefinery from Microalgae Grown in Wastewater PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2015 PhD Toxicity and Impact of Nanoparticles Released to the Environment by Cosmetics, Pharmaceuticals, Agricultural and Related Products PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2015 PhD Bio-Electrochemical Systems for Electricity and Hydrogen Production PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2015 PhD Modelling of dry spray desulfurization and denitrification reactors for integrated combustion flue gas cleaning PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2017 PhD Predicting Phytotoxicity of Metal(loid)s and Their Mixtures in Soil using Pore-Water based Transfer Functions PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Investigation of the Total Petroleum Hydrocarbon Degrading Microorganisms in Soil and Water: A Metagenomic Approach PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2017 PhD Eco-toxicity and Bioremediation of Mercury in Terrestrial Environments PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2016 PhD Phyco-nanotechnology for Chromium Remediation PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2016 PhD Green Synthesis of Iron Nanomaterials by Grape Leaf Extract and their Application in Removal of Contaminants PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
2016 PhD Illicit Drugs - Environmental Occurrence, Fate and Toxicity PhD (Environment Remediation), Faculty of Science, The University of Newcastle Principal Supervisor
2016 PhD Reclamation of abandoned copper mine soil using metallophytes Environmental Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2015 PhD Development of novel formulation for field inoculation of PAH degrading bacteria Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2015 PhD Diversity of purple non-sulfur bacteria in shrimp ponds and mercury resistant mechanisms of selected strains Microbiology, Prince of Songhkla University Co-Supervisor
2015 PhD Arsenic bioremediation by purple non-sulfur bacteria Microbiology, Prince of Songhkla University Co-Supervisor
2014 PhD Bioavailability and toxicity of heavy metals and metal mixtures to ecological and human health Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2014 PhD Earthworm biomarkers for monitoring persistent organic pollutants Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2014 PhD Phytoremediation of PAHs contaminated soils Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2014 PhD Ecotoxicity and Soil Persistence of 2,4-Dinitroanisole (DNAN)- an Ingredient in Insensitive Munitions Explosive Fills Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2014 PhD Green Synthesis, Environmental Application and Toxicity of Zero-valent Iron Nanoparticles Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2013 PhD Bioremediation of arsenic contaminated water Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2013 PhD Enzymatic detoxification of organophosphorus pesticides, fenamiphos and malathion Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2013 PhD Development of Microbial Fuel Cell Technology (MFC) for Remediation of Hydrocarbon contaminated Water Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2012 PhD Bioremediation of nitro-phenols and PAHs by mix cultures of bacteria and microalgae Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2011 PhD Remediation of environmental contaminants by novel organoclay adsorbents Public Health, UNiversity of SOuth AUstralia (UniSA) Co-Supervisor
2011 PhD Reduction and bioavailability of chromium in soils Public Health, UNiversity of SOuth AUstralia (UniSA) Co-Supervisor
2011 PhD Ecotoxicity and bioremediation of petroleum hydrocarbons Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2010 PhD Development of whole-cell microbial biosensors to assess the heavy metal bioavailability in soil environment Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2010 PhD Seaweed enhanced bioremediation of persistent organic pollutants in contaminated soils Public Health, UNiversity of SOuth AUstralia (UniSA) Co-Supervisor
2010 PhD Development and application of ultrasound technology for treatment of organic pollutants Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2010 PhD The role of phosphate solubilising bacteria in the immobilisation of lead using phosphate compounds Public Health, UNiversity of SOuth AUstralia (UniSA) Co-Supervisor
2010 PhD Heavy metal phytotoxicity and bioavailability in contaminated soils Public Health, UNiversity of SOuth AUstralia (UniSA) Co-Supervisor
2010 PhD Polybrominated diphenylethers in South Australian Environment: Human health risk assessment and toxicity to biota Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2009 PhD Fate, bioavailability and bioremediation of fenamiphos and its metabolites in soil Public Health, University of South Australia Principal Supervisor
2009 PhD Bioremediation of mixed contaminated soils with special reference to polycyclic aromatic hydrocarbons (PAHs) and toxic metals Public Health, UNiversity of SOuth AUstralia (UniSA) Principal Supervisor
2002 PhD Biotic-abiotic transformations of chromium in long-term waste contaminated soils: implications to remediation Soil Science, Adelaide University Co-Supervisor
2002 PhD Mechanisms for phosphorus elimination in constructed wetlands: A pilot study for the treatment of agricultural drainage water from dairy farms at the Lower Murray, South Australia Ecology and Evolution, Adelaide University Co-Supervisor
2001 PhD The use of microbial inoculants to enhance DDT degradation in contaminated soil Soil Science, The University of Adelaide Co-Supervisor
Edit

Research Collaborations

The map is a representation of a researchers co-authorship with collaborators across the globe. The map displays the number of publications against a country, where there is at least one co-author based in that country. Data is sourced from the University of Newcastle research publication management system (NURO) and may not fully represent the authors complete body of work.

Country Count of Publications
Australia 328
India 74
China 62
Korea, Republic of 14
United Kingdom 13
More...
Edit

Professor Megh Mallavarapu

Position

Professor of Environmental Biotechnology
Global Centre for Environmental Remediation (GCER)
Global Centre for Environmental Remediation
Faculty of Science

Contact Details

Email megh.mallavarapu@newcastle.edu.au
Phone (02) 4913 8734
Mobile 0438599508
Link Google+

Office

Room ATC 144
Building Advanced Technology Centre.
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
Edit