2021 |
Arachchige Chamila Samarasinghe SV, Krishnan K, Aitken RJ, Naidu R, Megharaj M, 'Persistence of the parabens in soil and their potential toxicity to earthworms', Environmental Toxicology and Pharmacology, 83 (2021) [C1]
Due to their antimicrobial activity, parabens are commonly used as preservatives in a variety of consumer goods including cosmetics, pharmaceuticals, and personal care products. D... [more]
Due to their antimicrobial activity, parabens are commonly used as preservatives in a variety of consumer goods including cosmetics, pharmaceuticals, and personal care products. During the production, usage and disposal of these products, parabens are released into the environment. In this study, the persistence of three widely used parabens; methyl-, propyl-, and butyl paraben in soil and their toxic effects on the soil invertebrate, Eisenia fetida was investigated. The results of this study indicate that selected parabens do not negatively affect the survival, growth, and reproduction of Eisenia fetida up to 1000 mg Kg concentration. Further, these parabens (0¿1000 mg Kg ) exhibited a low persistence in soil with more than 90 % disappearing within three days. In contrast, only 16¿54 % degradation of parabens occurred in frozen soil suggesting a microbial role in parabens degradation. This study demonstrates that methyl-, propyl-, and butyl parabens degrade rapidly in the terrestrial environment and therefore, are unlikely to pose a threat to species such as Eisenia fetida. To our knowledge, this is the first report on the toxicity of parabens to earthworms. -1 -1
|
|
|
2021 |
Tan X, Nie Y, Ma X, Guo Z, Liu Y, Tian H, et al., 'Soil chemical properties rather than the abundance of active and potentially active microorganisms control soil enzyme kinetics', Science of the Total Environment, 770 (2021) [C1]
Soil enzymes secreted by microorganisms play a critical role in nutrient cycling, soil structure maintenance, and crop production. However, understanding of the linkage between so... [more]
Soil enzymes secreted by microorganisms play a critical role in nutrient cycling, soil structure maintenance, and crop production. However, understanding of the linkage between soil enzyme kinetics and microbial metabolism and active microbial communities is remarkably limited. In this study, we measured the kinetics of three hydrolase enzymes, active microbial abundance and substrate-induced respiration (SIR) from 21 farmlands differing in their fertilities collected from the Loess Plateau, China. Results showed the high fertility soils had higher total organic carbon (TOC) and nutrient contents, potential microbial activity, the colony-forming units (CFU) of actinomycetes, and values of enzyme V and K than those of low fertility soils. We also observed that the CFU of fungi and other bacterial groups did not change with soil fertility status. Soil chemical properties explained 74.0% of the variance in V and 28.3% of the variance in K , respectively. Whereas, the abundance of main microbial groups and fungi/bacteria ratio only explained 10.2% and 7% of the variance of V and K , respectively. The interactive effect of soil properties and microbial community could explain 20.2% of the variance in K . Our results suggest that the substrate availability would mainly drive enzyme kinetics compared to the abundance of active/potentially active microbes in the farmland soils. max m max m max m m
|
|
|
2021 |
Tao K, Tian H, Fan J, Li D, Liu C, Megharaj M, et al., 'Kinetics and catalytic efficiency of soil fluorescein diacetate hydrolase under the pesticide parathion stress', Science of the Total Environment, 771 (2021) [C1]
Fluorescein diacetate hydrolase (FDA¿H) is an accurate biochemical method measuring the total microbial activity in soil, which indicates soil quality under ambient environmental ... [more]
Fluorescein diacetate hydrolase (FDA¿H) is an accurate biochemical method measuring the total microbial activity in soil, which indicates soil quality under ambient environmental changes such as pesticide parathion (PTH). However, the influence of PTH on the kinetics of FDA¿H is still unknown. In this study, fifteen farmland soils were exposed to acute PTH pollution to investigate how the kinetic characteristics of FDA¿H change with PTH concentration. Results showed that PTH strongly inhibited the FDA¿H activities. The values of maximum reaction velocity (V ) ranged from 0.29 to 2.18 × 10 mM g soil h and declined by 42.30%¿71.01% under PTH stress. The Michaelis constant (K ) values ranged between 2.90 and 14.17 × 10 mM and exhibited three forms including unchanged, increased (38.16¿242.65%) and decreased (13.41¿39.23%) when exposed to PTH. Based on the changes in two kinetic parameters, the inhibition of PTH on FDA¿H was classified as three types, i.e., noncompetitive, linear mixed and uncompetitive inhibition. The competitive inhibition constant (K ) and noncompetitive constant (K ) ranged from 0.064 to 0.447 mM and 0.209 to 0.723 mM, respectively, which were larger than the K in values. The catalytic efficiency (V /K ) of FDA¿H is a sensitive integrated parameter to evaluate the PTH toxicity due to the higher inhibition ratio than the V . The PTH toxicity to FDA¿H decreased with increase of soil organic matter and total nitrogen contents. This implied that the PTH toxicity could be alleviated by an increasing content of soil organic matter due to its buffering capacity to PTH. Besides, soils with a higher content of total nitrogen could provide stable environment for FDA¿H to maintain its functionality under PTH pollution. Thus, the results of this study have great implications to the risk assessment of parathion in soils. max m ic iu m max m max -2 -1 -1 -2
|
|
|
2021 |
Logeshwaran P, Sivaram AK, Surapaneni A, Kannan K, Naidu R, Megharaj M, 'Exposure to perfluorooctanesulfonate (PFOS) but not perflurorooctanoic acid (PFOA) at ppb concentration induces chronic toxicity in Daphnia carinata', Science of the Total Environment, 769 (2021) [C1]
Widespread environmental contamination of per- and polyfluoroalkyl substances (PFAS) is well established. Nevertheless, few studies have reported on the aquatic toxicity of PFAS, ... [more]
Widespread environmental contamination of per- and polyfluoroalkyl substances (PFAS) is well established. Nevertheless, few studies have reported on the aquatic toxicity of PFAS, especially in indicator species such as Daphnia. In this study, the toxicity of two major PFAS, namely perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS), was investigated on water flea (Daphnia carinata) using a battery of comprehensive toxicity tests, including a 48 h acute and a 21-day chronic assays. The survival, growth, and reproduction of D. carinata were monitored over a 21-day life cycle. PFOS exhibited higher toxicity than PFOA. The 48 h LC values (confidence interval) based on acute toxicity for PFOA and PFOS were 78.2 (54.9¿105) mg L and 8.8 (6.4¿11.6) mg L , respectively. Chronic exposure to PFOS for 21 days displayed mortality and reproductive defects in D. carinata at a concentration as low as 0.001 mg L . Genotoxicity assessment using comet assay revealed that exposure for 96 h to PFOS at 1 and 10.0 mg L significantly damaged the organism's genetic makeup. The results of this study have great implications for risk assessment of PFOS and PFOA in aquatic ecosystems, given the potential of PFOS to pose a risk to Daphnia even at lower concentrations (1 µg L ). 50 -1 -1 -1 -1 -1
|
|
|
2021 |
Kundu S, Patel S, Halder P, Patel T, Hedayati Marzbali M, Pramanik BK, et al., 'Removal of PFASs from biosolids using a semi-pilot scale pyrolysis reactor and the application of biosolids derived biochar for the removal of PFASs from contaminated water', Environmental Science: Water Research and Technology, 7 638-649 (2021) [C1]
This study focuses on the conversion of biosolids to biochar and its further use in adsorbing per- and polyfluoroalkyl substances (PFASs) from contaminated water. In particular, t... [more]
This study focuses on the conversion of biosolids to biochar and its further use in adsorbing per- and polyfluoroalkyl substances (PFASs) from contaminated water. In particular, this study aims to (a) investigate the performance of a semi-pilot fluidised bed pyrolysis unit in converting biosolids into biochar, (b) examine the ability of the pyrolysis-combustion integrated process to destruct PFASs present in biosolids and (c) study the application of biosolids derived biochar for removing PFASs from contaminated water. The semi-pilot fluidised bed pyrolysis unit demonstrated stable temperature and oxygen profiles in the reactor. The yield of biochar was found to be 36-45% at studied temperatures (500-600 °C). The produced biosolids derived biochar samples, due to their lower H/C and O/C ratio, were found to be extremely stable with an expected long (millennia) residence time in soil. It was concluded that >90% removal of perfluorooctanesulfonate (PFOS) and perfluorooctanoic acid (PFOA) from biosolids derived biochar could be achieved in the pyrolysis-combustion integrated process. The biosolids derived biochar demonstrated >80% adsorption of long-chain PFASs and 19-27% adsorption of short-chain PFASs from PFAS contaminated water. This journal is
|
|
|
2021 |
Sobhani Z, Fang C, Naidu R, Megharaj M, 'Microplastics as a vector of toxic chemicals in soil: Enhanced uptake of perfluorooctane sulfonate and perfluorooctanoic acid by earthworms through sorption and reproductive toxicity', Environmental Technology and Innovation, 22 (2021) [C1]
The accumulation of microplastics (MP) in soil via their continuous release and degradation of large plastics has recently become a serious global problem. The major concern with ... [more]
The accumulation of microplastics (MP) in soil via their continuous release and degradation of large plastics has recently become a serious global problem. The major concern with MP is their potential to sorb pollutants as well as ingestion by living organisms. Hence, this study focused on the effect of PVC MP exposure on increasing the risk of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) bioaccumulation in earthworms in addition to their reproduction. In general, the bioaccumulation factor (BAF) for PFOA and PFOS increased up to 200% in earthworms exposed to MP-contaminated soil. MP at 500 and 1000 mg kg soil caused enhanced uptake of PFOS and PFOA in earthworms, and a significant reduction in their reproduction. These results have significant implications for risk assessment of MP in soil. -1
|
|
|
2021 |
Perera IA, Abinandan S, R Subashchandrabose S, Venkateswarlu K, Naidu R, Megharaj M, 'Microalgal-bacterial consortia unveil distinct physiological changes to facilitate growth of microalgae.', FEMS Microbiol Ecol, 97 (2021) [C1]
|
|
|
2021 |
Lu G, Tian H, Nurzhan A, Gu X, Liu C, Megharaj M, He W, 'How different are the arsenic fractions inhibit alkaline phosphatases on aggregates scale?', Science of the Total Environment, 774 (2021) [C1]
Arsenate [As(V)], in general, is associated with various aggregates and exists as different species in soil, which in turn influences its toxicity and potential contamination. Pre... [more]
Arsenate [As(V)], in general, is associated with various aggregates and exists as different species in soil, which in turn influences its toxicity and potential contamination. Previous studies have demonstrated the usefulness of alkaline phosphatases (ALP) to evaluate As(V) pollution. However, the effect of different arsenic fractions on ALP among soil aggregates is still unclear. Thus, the distribution of As fractions and ALP kinetics was determined in four-month As-aged paddy soil aggregates. Results revealed the two major fractions of As in aggregates were humic-bound and Fe and Mn oxides-bound [both around 30% under 800 mg kg of As(V)]. Besides, it was observed that available soil phosphorus could positively affect the relative content of water-soluble, exchangeable and carbonate-bound arsenic. In the kinetics experiment, both the Michaelis-Menten constant (K ) and maximum reaction velocity (V ) of ALP increased with increasing As(V) concentration under four months ageing for each size aggregate. Multiple linear stepwise regression analysis between k and the relative content of arsenic fraction indicated that carbonate-bound arsenic is the main fraction that inhibited the k for macroaggregates (> 0.25 mm size). For soil aggregates of 0.1¿0.25 mm size, k increased with an increase in arsenic residual fraction. As for aggregates <0.1 mm size, Fe and Mn oxide-bound fraction is the main fraction that inhibited the k . Overall, this study suggests carbonate-bound and Fe and Mn oxide-bound arsenic fractions could decrease the ALP activities via a decrease in the catalytic efficiency in macroaggregates and <0.1 mm size aggregates, respectively. Besides, available phosphorus should be considered as the main factor when assessing As biotoxicity and mobility. -1 m max cat cat cat cat
|
|
|
2021 |
Abbasi S, Lamb DT, Kader M, Naidu R, Megharaj M, 'The influence of long-term ageing on arsenic ecotoxicity in soil', Journal of Hazardous Materials, 407 (2021)
The ageing of a contaminant in soil influences the bioavailability and toxicity of environmental pollutants. Yet, despite arsenic (As) being an important terrestrial contaminant, ... [more]
The ageing of a contaminant in soil influences the bioavailability and toxicity of environmental pollutants. Yet, despite arsenic (As) being an important terrestrial contaminant, the effect of As ageing on phytotoxicity has received relatively little research. Research to date has reported predominantly short term (< 0.5 years) experiments. Here, we studied the influence of ageing over 0.25 and 5 years on the phytotoxicity of As (as arsenate) on Cucumis sativus L. (cucumber). The study showed that increasing ageing time of As from 0.25 to 5 years increased the EC and EC values by 4.0 and 1.76 fold, respectively. The dependence of ageing on soil properties was also examined, although only Freundlich sorption parameters were correlated to the ageing factor (r = 0.68, P = 0.028). Soils with high adsorption capacity also showed the greatest change in toxicity over 5 years. In addition, data was compiled from relevant literature to develop a model for As ecotoxicity. The combined model (n = 54) showed no relationship with pH but was correlated to the oxalate extractable iron content and %clay. Arsenate ecotoxicity (EC , mg/kg) in the multivariate model was related to oxalate iron content, %clay and ageing time. Thus, the results of this study have significant implications for risk assessment of long-term As contaminated soils. 10 50 50
|
|
|
2021 |
Yao X, Chen P, Cheng T, Sun K, Megharaj M, He W, 'Inoculation of Bacillus megaterium strain A14 alleviates cadmium accumulation in peanut: effects and underlying mechanisms', JOURNAL OF APPLIED MICROBIOLOGY, (2021)
|
|
|
2021 |
Gao Y, Du J, Bahar MM, Wang H, Subashchandrabose S, Duan L, et al., 'Metagenomics analysis identifies nitrogen metabolic pathway in bioremediation of diesel contaminated soil', Chemosphere, 271 (2021) [C1]
Nitrogen amendment is known to effectively enhance the bioremediation of hydrocarbon-contaminated soil, but the nitrogen metabolism in this process is not well understood. To unra... [more]
Nitrogen amendment is known to effectively enhance the bioremediation of hydrocarbon-contaminated soil, but the nitrogen metabolism in this process is not well understood. To unravel the nitrogen metabolic pathway(s) of diesel contaminated soil, six types of nitrogen sources were added to the diesel contaminated soil. Changes in microbial community and soil enzyme genes were investigated by metagenomics analysis and chemical analysis through a 30-day incubation study. The results showed that ammonium based nitrogen sources significantly accelerated the degradation of total petroleum hydrocarbon (TPH) (79¿81%) compared to the control treatment (38%) and other non-ammonium based nitrogen amendments (43¿57%). Different types of nitrogen sources could dramatically change the microbial community structure and soil enzyme gene abundance. Proteobacteria and Actinobacteria were identified as the two dominant phyla in the remediation of diesel contaminated soil. Metagenomics analysis revealed that the preferred metabolic pathway of nitrogen was from ammonium to glutamate via glutamine, and the enzymes governing this transformation were glutamine synthetase and glutamate synthetase; while in nitrate based amendment, the conversion from nitrite to ammonium was restrained by the low abundance of nitrite reductase enzyme and therefore retarded the TPH degradation rate. It is concluded that during the process of nitrogen enhanced bioremediation, the most efficient nitrogen cycling direction was from ammonium to glutamine, then to glutamate, and finally joined with carbon metabolism after transforming to 2-oxoglutarate.
|
|
|
2021 |
Ramakrishnan B, Maddela NR, Venkateswarlu K, Megharaj M, 'Organic farming: Does it contribute to contaminant-free produce and ensure food safety?', Science of the Total Environment, 769 (2021) [C1]
Organic farming for higher ecological and human health benefits has been adopted in about 186 countries, covering a total area of 71.5 Mha worldwide. Because of the associated pra... [more]
Organic farming for higher ecological and human health benefits has been adopted in about 186 countries, covering a total area of 71.5 Mha worldwide. Because of the associated practices, the flows of several environmental pollutants into the organic products threaten food safety and human health. The contaminants that occur at higher concentrations in organic produce include persistent organic pollutants (61.3¿436.9 ng g lamb meat, and 0.28 pg g -2.75 ng g bovine meat), heavy metals (0.5¿33.0 mg kg lettuce), organochlorine pesticides (11¿199 µg g carrots), cyclodienes, hexachlorocyclohexanes, hexabromocyclododecane (2¿3 times higher than in conventionally produced porcine meat), hexachlorobenzene (1.38¿14.49 ng g fat in milk), and non-brominated flame retardants (1.3¿3.2 times higher than in conventional produce of greenhouse-grown tomato and cucumber). Moreover, some pollutants like per- and polyfluoroalkyl substances with a longer half-life (1.50¿9.10 yrs) are reported to occur in several organic products. In fact, several legacy persistent organic pollutants are known for their significant trophic magnification in an urban terrestrial ecosystem. In addition, many plant functionalities are adversely affected in organic farming. Therefore, the long-term usage of organic products containing such pollutants poses a significant threat to human health. The major limitation in organic livestock production is the severe shortage of organic feed. Several variable standards and technical regulations set by the government and private agencies are the major obstacles in the global marketing of organic products. The present review critically addresses the impact of organic farming on hidden risks due to the use of composts as the amendment resources that enhance the phytoaccumulation and trophic transfer of pollutants, the functional diversity of the ecosystems, and poor harmonization among the policies and regulations in different countries for organic farming. The future directions of research have been suggested to mitigate unintended flows of pollutants into the organic products. -1 -1 -1 -1 -1 -1
|
|
|
2020 |
Lu G, Tian H, Tan X, Megharaj M, He Y, He W, 'Distribution of soil nutrients and enzyme activities in different aggregates under two sieving methods', Soil Science Society of America Journal, 84 331-344 (2020) [C1]
|
|
|
2020 |
He W, Megharaj M, Wu CY, Subashchandrabose SR, Dai CC, 'Endophyte-assisted phytoremediation: mechanisms and current application strategies for soil mixed pollutants', Critical Reviews in Biotechnology, 40 31-45 (2020) [C1]
|
|
|
2020 |
Sivaram AK, Subashchandrabose SR, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Rhizodegradation of PAHs differentially altered by C3 and C4 plants', Scientific Reports, 10 (2020) [C1]
|
|
|
2020 |
Dhar K, Subashchandrabose SR, Venkateswarlu K, Krishnan K, Megharaj M, 'Anaerobic Microbial Degradation of Polycyclic Aromatic Hydrocarbons: A Comprehensive Review', Reviews of Environmental Contamination and Toxicology, 251 25-108 (2020) [C1]
|
|
|
2020 |
Abinandan S, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Sustainable Iron Recovery and Biodiesel Yield by Acid-Adapted Microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, Grown in Synthetic Acid Mine Drainage', ACS Omega, 5 6888-6894 (2020) [C1]
|
|
|
2020 |
Logeshwaran P, Sivaram AK, Yadav M, Chadalavada S, Naidu R, Megharaj M, 'Phytotoxicity of Class B aqueous firefighting formulations, Tridol S 3 and 6% to Lemna minor', Environmental Technology and Innovation, 18 (2020) [C1]
|
|
|
2020 |
Munagamage T, Rathnayake IVN, Pathiratne A, Megharaj M, 'Comparison of Sensitivity of Tropical Freshwater Microalgae to Environmentally Relevant Concentrations of Cadmium and Hexavalent Chromium in Three Types of Growth Media', Bulletin of Environmental Contamination and Toxicology, 105 397-404 (2020) [C1]
|
|
|
2020 |
Naidu R, Nadebaum P, Fang C, Cousins I, Pennell K, Conder J, et al., 'Per- and poly-fluoroalkyl substances (PFAS): Current status and research needs', Environmental Technology and Innovation, 19 (2020) [C1]
|
|
|
2020 |
Abinandan S, Perera IA, Subashchandrabose SR, Venkateswarlu K, Cole N, Megharaj M, 'Acid-adapted microalgae exhibit phenotypic changes for their survival in acid mine drainage samples', FEMS Microbiology Ecology, 96 (2020) [C1]
Phenotypic plasticity or genetic adaptation in an organism provides phenotypic changes when exposed to the extreme environmental conditions. The resultant physiological and metabo... [more]
Phenotypic plasticity or genetic adaptation in an organism provides phenotypic changes when exposed to the extreme environmental conditions. The resultant physiological and metabolic changes greatly enhance the organism's potential for its survival in such harsh environments. In the present novel approach, we tested the hypothesis whether acid-adapted microalgae, initially isolated from non-acidophilic environments, can survive and grow in acid-mine-drainage (AMD) samples. Two acid-adapted microalgal strains, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, were tested individually or in combination (co-culture) for phenotypic changes during their growth in samples collected from AMD. The acid-adapted microalgae in AMD exhibited a two-fold increase in growth when compared with those grown at pH 3.5 in BBM up to 48 h and then declined. Furthermore, oxidative stress triggered several alterations such as increased cell size, granularity, and enhanced lipid accumulation in AMD-grown microalgae. Especially, the apparent limitation of phosphate in AMD inhibited the uptake of copper and iron in the cultures. Interestingly, growth of the acid-adapted microalgae in AMD downregulated amino acid metabolic pathways as a survival mechanism. This study demonstrates for the first time that acid-adapted microalgae can survive under extreme environmental conditions as exist in AMD by effecting significant phenotypic changes.
|
|
|
2020 |
Sobhani Z, Zhang X, Gibson C, Naidu R, Megharaj M, Fang C, 'Identification and visualisation of microplastics/nanoplastics by Raman imaging (i): Down to 100 nm', Water Research, 174 (2020) [C1]
|
|
|
2020 |
Logeshwaran P, Krishnan K, Naidu R, Megharaj M, 'Purification and characterization of a novel fenamiphos hydrolysing enzyme from Microbacterium esteraromaticum MM1', Chemosphere, 252 (2020) [C1]
|
|
|
2020 |
Maddela NR, Kakarla D, García LC, Chakraborty S, Venkateswarlu K, Megharaj M, 'Cocoa-laden cadmium threatens human health and cacao economy: A critical view', Science of the Total Environment, 720 (2020) [C1]
|
|
|
2020 |
Meftaul IM, Venkateswarlu K, Dharmarajan R, Annamalai P, Asaduzzaman M, Parven A, Megharaj M, 'Controversies over human health and ecological impacts of glyphosate: Is it to be banned in modern agriculture?', Environmental Pollution, 263 (2020) [C1]
|
|
|
2020 |
Sobhani Z, Lei Y, Tang Y, Wu L, Zhang X, Naidu R, et al., 'Microplastics generated when opening plastic packaging', Scientific reports, 10 (2020) [C1]
|
|
|
2020 |
Patel S, Kundu S, Halder P, Ratnnayake N, Marzbali MH, Aktar S, et al., 'A critical literature review on biosolids to biochar: an alternative biosolids management option', Reviews in Environmental Science and Biotechnology, 19 807-841 (2020) [C1]
The biosolids management is becoming an increased concern for the wastewater sector in recent times due to production of large volume of biosolids, their higher processing costs a... [more]
The biosolids management is becoming an increased concern for the wastewater sector in recent times due to production of large volume of biosolids, their higher processing costs and the presence of emerging contaminants. The pyrolysis of biosolids is gaining significant interest in the industry sector as well as research community over the last decade due to its ability to reduce biosolids volume, produce high-value biochar product and minimise the risk associated with contaminants. This paper aims to critically review the literature on biosolids management techniques and their current challenges, biosolids characteristics and its suitability for pyrolysis, pyrolysis product characterisation from different reactor designs and biochar application as a soil amendment, adsorbent and catalyst. The efforts have also been made to critically summarise studies on the process modelling activities and techno-economic assessments including some key pilot-scale demonstrations of recent time. The review concludes that biosolids to biochar can be an effective alternative to biosolids management; however, its commercial viability is limited in the current scenario. In the end, efforts have been made to highlight current challenges including research gaps and future perspectives in improving its commercial viability.
|
|
|
2020 |
Kuppusamy S, Venkateswarlu K, Megharaj M, 'Examining the polyphenol content, antioxidant activity and fatty acid composition of twenty-one different wastes of fruits, vegetables, oilseeds and beverages', SN Applied Sciences, 2 (2020)
Abstract: One of the most abundantly available, cost-effective valuable resources that are of all-time concern for minimization and economical re-utilization is food waste, and qu... [more]
Abstract: One of the most abundantly available, cost-effective valuable resources that are of all-time concern for minimization and economical re-utilization is food waste, and quantifying the phenolic compounds and identifying the principle chemical constituents will favour their industrial exploitation potential. Water, methanol and ethanol extracts of 21 common food wastes of four different classes (fruits, vegetables, oilseeds and beverages) were screened by determination of their antioxidant activity (measured by DPPH activity, reducing power and phosphomolybdenum method) as well as total phenol, flavonoid and ascorbic acid contents. Further predominant chemical constituents (essential fatty acid composition and elemental contents) of the top four phytochemical-rich food wastes were investigated by GC¿MS and ICP¿MS. Water was more efficient for polyphenol extraction, and ethanol extracts for antioxidant power. Onion peel, pineapple skin and date seed had the highest phenolic content and antioxidant activity. Radish peel showed the highest ascorbic acid content (48.9 ± 1.5¿mg/g). Onion peel emerged as a unique source of flavonoids (> 80%). Onion peel, radish peel and pineapple skin were identified to be the sources of essential fatty acid, i.e., linoleic acid, particularly radish peel being the rich source of alpha-linoleic acid highlighting its potential for human dietary intake or as animal feed. Moreover, the screened polyphenol and unsaturated omega fatty acid-rich food wastes constituted considerable quantities of essential macro- and micronutrients. Our study demonstrates the possibility of recovering large amounts of natural phytochemicals from food wastes as alternatives to synthetics and for industrial applications. Graphic abstract: [Figure not available: see fulltext.]
|
|
|
2020 |
Sivaram AK, Logeshwaran P, Surapaneni A, Shah K, Crosbie N, Rogers Z, et al., 'Evaluation of Cyto-genotoxicity of Perfluorooctane Sulfonate (PFOS) to Allium cepa', ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 40 792-798 (2020) [C1]
|
|
|
2020 |
Bahar MM, Mahbub KR, Naidu R, Megharaj M, 'A simple spectrophotometric method for rapid quantitative screening of arsenic bio-transforming bacteria', Environmental Technology and Innovation, 19 (2020) [C1]
|
|
|
2020 |
Abinandan S, Praveen K, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Life Cycle Assessment for the Environmental Sustainability of the Immobilized Acid-Adapted Microalgal Technology in Iron Removal from Acid Mine Drainage', ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 8 15670-15677 (2020) [C1]
|
|
|
2020 |
Li H, Tian H, Liu C, Lu G, Wang Z, Tan X, et al., 'The effect of arsenic on soil intracellular and potential extracellular ß-glucosidase differentiated by chloroform fumigation', Science of the Total Environment, 727 (2020) [C1]
|
|
|
2020 |
Maddela NR, Venkateswarlu K, Megharaj M, 'Tris(2-chloroethyl) phosphate, a pervasive flame retardant: Critical perspective on its emissions into the environment and human toxicity', Environmental Science: Processes & Impacts, 22 1809-1827 (2020) [C1]
|
|
|
2020 |
Ramadass K, Kuppusamy S, Venkateswarlu K, Naidu R, Megharaj M, 'Unresolved complex mixtures of petroleum hydrocarbons in the environment: An overview of ecological effects and remediation approaches', CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, (2020)
|
|
|
2020 |
Md Meftaul I, Venkateswarlu K, Dharmarajan R, Annamalai P, Megharaj M, 'Pesticides in the urban environment: A potential threat that knocks at the door', Science of the Total Environment, 711 (2020) [C1]
|
|
|
2020 |
Ma Y, Li L, Awasthi MK, Tian H, Lu M, Megharaj M, et al., 'Time-course transcriptome analysis reveals the mechanisms of Burkholderia sp. adaptation to high phenol concentrations', Applied Microbiology and Biotechnology, 104 5873-5887 (2020) [C1]
|
|
|
2020 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'The impact of low molecular weight organic acids from plants with C3 and C4 photosystems on the rhizoremediation of polycyclic aromatic hydrocarbons contaminated soil', Environmental Technology and Innovation, 19 (2020) [C1]
|
|
|
2020 |
Parven A, Sarker MR, Megharaj M, Md Meftaul I, 'Prolonging the shelf life of Papaya (Carica papaya L.) using Aloe vera gel at ambient temperature', Scientia Horticulturae, 265 (2020) [C1]
|
|
|
2020 |
Wang Z, Tian H, Lei M, Megharaj M, Tan X, Wang F, et al., 'Soil enzyme kinetics indicate ecotoxicity of long-term arsenic pollution in the soil at field scale', Ecotoxicology and Environmental Safety, 191 (2020) [C1]
|
|
|
2020 |
Halim MA, Rahman MM, Megharaj M, Naidu R, 'Cadmium Immobilization in the Rhizosphere and Plant Cellular Detoxification: Role of Plant-Growth-Promoting Rhizobacteria as a Sustainable Solution', Journal of Agricultural and Food Chemistry, 68 13497-13529 (2020) [C1]
Food is the major cadmium (Cd)-exposure pathway from agricultural soils to humans and other living entities and must be reduced in an effective way. A plant can select beneficial ... [more]
Food is the major cadmium (Cd)-exposure pathway from agricultural soils to humans and other living entities and must be reduced in an effective way. A plant can select beneficial microbes, like plant-growth-promoting rhizobacteria (PGPR), depending upon the nature of root exudates in the rhizosphere, for its own benefits, such as plant growth promotion as well as protection from metal toxicity. This review intends to seek out information on the rhizo-immobilization of Cd in polluted soils using the PGPR along with plant nutrient fertilizers. This review suggests that the rhizo-immobilization of Cd by a combination of PGPR and nanohybrid-based plant nutrient fertilizers would be a potential and sustainable technology for phytoavailable Cd immobilization in the rhizosphere and plant cellular detoxification, by keeping the plant nutrition flow and green dynamics of plant nutrition and boosting the plant growth and development under Cd stress.
|
|
|
2020 |
Lal MS, Megharaj M, Naidu R, Bahar MM, 'Uptake of perfluorooctane sulfonate (PFOS) by common home-grown vegetable plants and potential risks to human health', Environmental Technology and Innovation, 19 (2020) [C1]
|
|
|
2020 |
Dhar K, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Mesorhizobium tamadayense MM3441: A novel methylotroph with a great potential in degrading N,N'-dimethylformamide', International Biodeterioration and Biodegradation, 153 (2020) [C1]
|
|
|
2020 |
Maddela NR, Venkateswarlu K, Kakarla D, Megharaj M, 'Inevitable human exposure to emissions of polybrominated diphenyl ethers: A perspective on potential health risks', Environmental Pollution, 266 (2020) [C1]
|
|
|
2020 |
Mahbub KR, King WL, Siboni N, Nguyen VK, Rahman MM, Megharaj M, et al., 'Long-lasting effect of mercury contamination on the soil microbiota and its co-selection of antibiotic resistance', Environmental Pollution, 265 (2020) [C1]
|
|
|
2020 |
Meftaul IM, Venkateswarlu K, Dharmarajan R, Annamalai P, Megharaj M, 'Movement and Fate of 2,4-D in Urban Soils: A Potential Environmental Health Concern', ACS Omega, 5 13287-13295 (2020) [C1]
|
|
|
2019 |
Ma Y, Li L, Tian H, Lu M, Megharaj M, He W, 'Transcriptional analysis of the laccase-like gene from Burkholderia cepacia BNS and expression in Escherichia coli', Applied Microbiology and Biotechnology, 103 747-760 (2019) [C1]
|
|
|
2019 |
Narenkumar J, Elumalai P, Subashchandrabose S, Megharaj M, Balagurunathan R, Murugan K, Rajasekar A, 'Role of 2-mercaptopyridine on control of microbial influenced corrosion of copper CW024A metal in cooling water system', Chemosphere, 222 611-618 (2019) [C1]
|
|
|
2019 |
Abinandan S, Subashchandrabose SR, Pannerselvan L, Venkateswarlu K, Megharaj M, 'Potential of acid-tolerant microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, in heavy metal removal and biodiesel production at acidic pH', Bioresource Technology, 278 9-16 (2019) [C1]
|
|
|
2019 |
Mukkata K, Kantachote D, Wittayaweerasak B, Megharaj M, Naidu R, 'The potential of mercury resistant purple nonsulfur bacteria as effective biosorbents to remove mercury from contaminated areas', Biocatalysis and Agricultural Biotechnology, 17 93-103 (2019) [C1]
|
|
|
2019 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Phytoremediation efficacy assessment of polycyclic aromatic hydrocarbons contaminated soils using garden pea (Pisum sativum)and earthworms (Eisenia fetida)', Chemosphere, 229 227-235 (2019) [C1]
|
|
|
2019 |
Abinandan S, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Soil microalgae and cyanobacteria: the biotechnological potential in the maintenance of soil fertility and health', Critical Reviews in Biotechnology, 39 981-998 (2019) [C1]
|
|
|
2019 |
Abinandan S, Subashchandrabose SR, Cole N, Dharmarajan R, Venkateswarlu K, Mallavarapu M, 'Sustainable production of biomass and biodiesel by acclimation of non-acidophilic microalgae to acidic conditions', Bioresource Technology, 271 316-324 (2019) [C1]
|
|
|
2019 |
Wang Z, Tian H, Tan X, Wang F, Jia H, Megharaj M, He W, 'Long-term As contamination alters soil enzyme functional stability in response to additional heat disturbance.', Chemosphere, 229 471-480 (2019) [C1]
|
|
|
2019 |
Tian H, Wang J, Li J, Wang Y, Mallavarapu M, He W, 'Six New Families of Aerobic Arsenate Reducing Bacteria: Leclercia, Raoultella, Kosakonia, Lelliottia, Yokenella, and Kluyvera', Geomicrobiology Journal, 36 339-347 (2019) [C1]
|
|
|
2019 |
Cáceres T, Venkateswarlu K, Megharaj M, 'Acute toxicity of the insecticide methyl parathion and its hydrolytic product p-nitrophenol to the native Australian cladoceran Daphnia carinata.', Ecotoxicology, 28 680-685 (2019) [C1]
|
|
|
2019 |
Wang L, Cheng Y, Lamb D, Megharaj M, Naidu R, 'Application of Ion Selective Electrode array to simultaneously determinate multi-free ions in solution', Environmental Technology and Innovation, 15 (2019) [C1]
|
|
|
2019 |
Yu B, Li K, Ji L, Yang Q, Jiang K, Megharaj M, et al., 'Coupling a sterically hindered amine-based absorption and coal fly ash triggered amine regeneration: A high energy-saving process for CO2 absorption and sequestration', International Journal of Greenhouse Gas Control, 87 58-65 (2019) [C1]
|
|
|
2019 |
Desalegn B, Megharaj M, Chen Z, Naidu R, 'Green synthesis of zero valent iron nanoparticle using mango peel extract and surface characterization using XPS and GC-MS', Heliyon, 5 (2019) [C1]
|
|
|
2019 |
Sobhani Z, Al Amin M, Naidu R, Megharaj M, Fang C, 'Identification and visualisation of microplastics by Raman mapping', Analytica Chimica Acta, 1077 191-199 (2019) [C1]
|
|
|
2019 |
Subashchandrabose SR, Venkateswarlu K, Venkidusamy K, Palanisami T, Naidu R, Megharaj M, 'Bioremediation of soil long-term contaminated with PAHs by algal bacterial synergy of Chlorella sp. MM3 and Rhodococcus wratislaviensis strain 9 in slurry phase', Science of the Total Environment, 659 724-731 (2019) [C1]
|
|
|
2019 |
Liu C, Duan X, Chen Q, Chao C, Lu Z, Lai Q, Megharaj M, 'Investigations on pyrolysis of microalgae Diplosphaera sp. MM1 by TG-FTIR and Py-GC/MS: Products and kinetics', Bioresource Technology, 294 (2019) [C1]
|
|
|
2019 |
Bekele DN, Du J, de Freitas LG, Mallavarapu M, Chadalavada S, Naidu R, 'Actively facilitated permeable reactive barrier for remediation of TCE from a low permeability aquifer: Field application', Journal of Hydrology, 572 592-602 (2019) [C1]
|
|
|
2019 |
Irankhah S, Abdi Ali A, Mallavarapu M, Soudi MR, Subashchandrabose S, Gharavi S, Ayati B, 'Ecological role of Acinetobacter calcoaceticus GSN3 in natural biofilm formation and its advantages in bioremediation.', Biofouling, 35 377-391 (2019) [C1]
|
|
|
2019 |
Ramakrishnan B, Venkateswarlu K, Sethunathan N, Megharaj M, 'Local applications but global implications: Can pesticides drive microorganisms to develop antimicrobial resistance?', Science of the Total Environment, 654 177-189 (2019) [C1]
|
|
|
2019 |
Yu B, Yu H, Li K, Ji L, Yang Q, Chen Z, Megharaj M, 'Integration of a diamine solvent based absorption and coal fly ash based mineralisation for CO2 sequestration', Fuel Processing Technology, 192 220-226 (2019) [C1]
|
|
|
2019 |
Sivaram AK, Subashchandrabose SR, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Metabolomics reveals defensive mechanisms adapted by maize on exposure to high molecular weight polycyclic aromatic hydrocarbons.', Chemosphere, 214 771-780 (2019) [C1]
|
|
|
2019 |
Sivaram AK, Logeshwaran P, Lockington R, Naidu R, Megharaj M, 'Low molecular weight organic acids enhance the high molecular weight polycyclic aromatic hydrocarbons degradation by bacteria', Chemosphere, 222 132-140 (2019) [C1]
|
|
|
2019 |
Liu C, Tian H, Li H, Xie W, Wang Z, Megharaj M, He W, 'The accuracy in the assessment of arsenic toxicity using soil alkaline phosphatase depends on soil water contents', Ecological Indicators, 102 457-465 (2019) [C1]
|
|
|
2019 |
Abinandan S, Subashchandrabose SR, Venkateswarlu K, Perera IA, Megharaj M, 'Acid-tolerant microalgae can withstand higher concentrations of invasive cadmium and produce sustainable biomass and biodiesel at pH 3.5', Bioresource Technology, 281 469-473 (2019) [C1]
|
|
|
2019 |
Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Biodegradation of high-molecular weight PAHs by Rhodococcus wratislaviensis strain 9: Overexpression of amidohydrolase induced by pyrene and BaP', Science of the Total Environment, 651 813-821 (2019) [C1]
|
|
|
2019 |
Lu G, Tian H, Wang Z, Li H, Mallavarapu M, He W, 'The distribution of arsenic fractions and alkaline phosphatase activities in different soil aggregates following four months As(V) ageing', Chemosphere, 236 (2019) [C1]
|
|
|
2019 |
Yu B, Yu H, Yang Q, Li K, Ji L, Zhang R, et al., 'Postcombustion Capture of CO2 by Diamines Containing One Primary and One Tertiary Amino Group: Reaction Rate and Mechanism', ENERGY & FUELS, 33 7500-7508 (2019) [C1]
|
|
|
2019 |
Perera IA, Abinandan S, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Advances in the technologies for studying consortia of bacteria and cyanobacteria/microalgae in wastewaters', CRITICAL REVIEWS IN BIOTECHNOLOGY, 39 709-731 (2019) [C1]
|
|
|
2018 |
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 (2018) [C1]
|
|
|
2018 |
Ganeshkumar V, Subashchandrabose SR, Dharmarajan R, Venkateswarlu K, Naidu R, Megharaj M, 'Use of mixed wastewaters from piggery and winery for nutrient removal and lipid production by Chlorella sp. MM3', BIORESOURCE TECHNOLOGY, 256 254-258 (2018) [C1]
|
|
|
2018 |
Panneerselvan L, Krishnan K, Subashchandrabose SR, Naidu R, Mallavarapu M, 'Draft Genome Sequence of Microbacterium esteraromaticum MM1, a Bacterium That Hydrolyzes the Organophosphorus Pesticide Fenamiphos, Isolated from Golf Course Soil', Microbiology Resource Announcements, 7 1-2 (2018) [C1]
|
|
|
2018 |
Tan X, He Y, Wang Z, Li C, Kong L, Tian H, et al., 'Soil mineral alters the effect of Cd on the alkaline phosphatase activity', Ecotoxicology and Environmental Safety, 161 78-84 (2018) [C1]
|
|
|
2018 |
Khan MAI, Biswas B, Smith E, Naidu R, Megharaj M, 'Toxicity assessment of fresh and weathered petroleum hydrocarbons in contaminated soil- a review.', Chemosphere, 212 755-767 (2018) [C1]
|
|
|
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) [C1]
|
|
|
2018 |
Abinandan S, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Microalgae-bacteria biofilms: a sustainable synergistic approach in remediation of acid mine drainage', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 102 1131-1144 (2018) [C1]
|
|
|
2018 |
Subashchandrabose SR, Venkateswarlu K, Krishnan K, Naidu R, Lockington R, Megharaj M, 'Rhodococcus wratislaviensis strain 9: An efficient p-nitrophenol degrader with a great potential for bioremediation', JOURNAL OF HAZARDOUS MATERIALS, 347 176-183 (2018) [C1]
|
|
|
2018 |
Sivaram AK, Logeshwaran P, Subashchandrabose SR, Lockington R, Naidu R, Megharaj M, 'Comparison of plants with C3 and C4 carbon fixation pathways for remediation of polycyclic aromatic hydrocarbon contaminated soils', SCIENTIFIC REPORTS, 8 (2018) [C1]
|
|
|
2018 |
Bahar MM, Mahbub KR, Naidu R, Megharaj M, 'As(V) removal from aqueous solution using a low-cost adsorbent coir pith ash: Equilibrium and kinetic study', Environmental Technology and Innovation, 9 198-209 (2018) [C1]
|
|
|
2018 |
Wijayawardena MAA, 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, 18 1602-1609 (2018) [C1]
|
|
|
2018 |
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', Environmental Science and Pollution Research, 25 5063-5070 (2018) [C1]
Chromium from tannery waste dump site causes significant environmental pollution affecting surrounding flora and fauna. The primary aims of this study were to survey vegetation, i... [more]
Chromium from tannery waste dump site causes significant environmental pollution affecting surrounding flora and fauna. The primary aims of this study were to survey vegetation, investigate the degree of soil pollution occurring near tannery waste dump site and make a systematic evaluation of soil contamination based on the chromium levels found in plants and earthworms from the impacted areas. This paper presents the pollution load of toxic heavy metals, and especially chromium, in 10 soil samples and 12 species of plants. Soil samples were analysed for heavy metals by using ICP-MS/ICP-OES method. Results indicated that Cr in soils exceeded soil quality guideline limits (SQGL). The total chromium present in the above ground parts of plants ranged from 1.7¿mg¿kg in Casuarina sp.¿to 1007¿mg¿kg in Sonchus asper. The Cr bioaccumulation in Eisenia fetida from tannery waste soil ranged from 5 to 194¿mg¿kg . The high enrichment factor of Cr in S. asper and bioaccumulation factor in earthworms indicate that there is a steady increase of toxic chromium risk in this area, which could be correlated with the past dumping activity. Emphasis needs to be put on control measures of pollution and remediation techniques in such areas to achieve an ecologically sustainable industrialisation. -1 -1 -1
|
|
|
2018 |
Venkidusamy K, Hari AR, Megharaj M, 'Petrophilic, Fe(III) reducing exoelectrogen Citrobacter sp. KVM11, isolated from hydrocarbon fed microbial electrochemical remediation systems', Frontiers in Microbiology, 9 (2018) [C1]
|
|
|
2018 |
Kuppusamy S, Kakarla D, Venkateswarlu K, Megharaj M, Yoon Y-E, Lee YB, 'Veterinary antibiotics (VAs) contamination as a global agro-ecological issue: A critical view', AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 257 47-59 (2018) [C1]
|
|
|
2018 |
Perera I, Subashchandrabose SR, Venkateswarlu K, Naidu R, Megharaj M, 'Consortia of cyanobacteria/microalgae and bacteria in desert soils: an underexplored microbiota', APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 102 7351-7363 (2018) [C1]
|
|
|
2018 |
Khan MAI, Biswas B, Smith E, Mahmud SA, Hasan NA, Khan MAW, et al., 'Microbial diversity changes with rhizosphere and hydrocarbons in contrasting soils.', Ecotoxicology and Environmental Safety, 156 434-442 (2018) [C1]
|
|
|
2018 |
Yu B, Yu H, Li K, Ji L, Yang Q, Wang X, et al., 'A Diamine-Based Integrated Absorption-Mineralization Process for Carbon Capture and Sequestration: Energy Savings, Fast Kinetics, and High Stability', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 52 13629-13637 (2018) [C1]
|
|
|
2018 |
Nookongbut P, Kantachote D, Megharaj M, Naidu R, 'Reduction in arsenic toxicity and uptake in rice (Oryza sativa L.) by As-resistant purple nonsulfur bacteria', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 25 36530-36544 (2018) [C1]
|
|
|
2018 |
Mahbub KR, Bahar MM, Megharaj M, Labbate M, 'Are the existing guideline values adequate to protect soil health from inorganic mercury contamination?', Environment International, 117 10-15 (2018) [C1]
|
|
|
2018 |
Fang C, Sobhani Z, Megharaj M, Naidu R, 'Electrochemical Proof of Fluorophilic Interaction Among Fluoro-Carbon Chains', Electroanalysis, 30 2349-2355 (2018) [C1]
|
|
|
2018 |
Kader M, Lamb DT, Wang L, Megharaj M, Naidu R, 'Copper interactions on arsenic bioavailability and phytotoxicity in soil', Ecotoxicology and Environmental Safety, 148 738-746 (2018) [C1]
|
|
|
2018 |
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', Ecotoxicology and Environmental Safety, 148 721-728 (2018) [C1]
|
|
|
2018 |
Tian H, Zhao Y, Megharaj M, He W, 'Arsenate inhibition on kinetic characteristics of alkaline phosphatase as influenced by pH', Ecological Indicators, 85 1101-1106 (2018) [C1]
|
|
|
2018 |
Selvakumar R, Ramadoss G, Mridula PM, Rajendran K, Thavamani P, Ravi N, Megharaj M, 'Challenges and complexities in remediation of uranium contaminated soils: A review', Journal of Environmental Radioactivity, 192 592-603 (2018) [C1]
|
|
|
2018 |
Abinandan S, Subashchandrabose SR, Venkateswarlu K, Megharaj M, 'Nutrient removal and biomass production: advances in microalgal biotechnology for wastewater treatment', Critical Reviews in Biotechnology, 38 1244-1260 (2018) [C1]
|
|
|
2018 |
Nirola R, Biswas B, Megharaj M, Subramanian A, Thavamani P, Aryal R, Saint C, 'Assessment of chromium hyper-accumulative behaviour using biochemical analytical techniques of greenhouse cultivated Sonchus asper on tannery waste dump site soils', Environmental Science and Pollution Research, 25 26992-26999 (2018) [C1]
|
|
|
2018 |
Samarasinghe SVAC, Krishnan K, Naidu R, Megharaj M, Miller K, Fraser B, Aitken RJ, 'Parabens generate reactive oxygen species in human spermatozoa', ANDROLOGY, 6 532-541 (2018) [C1]
|
|
|
2018 |
Guo S, Lin J, Wang Q, Megharaj M, Chen Z, 'The toxicity of graphene and its impacting on bioleaching of metal ions from sewages sludge by Acidithiobacillus sp.', CHEMOSPHERE, 195 90-97 (2018) [C1]
|
|
|
2018 |
Logeshwaran P, Megharaj M, Chadalavada S, Bowman M, Naidu R, 'Petroleum hydrocarbons (PH) in groundwater aquifers: An overview of environmental fate, toxicity, microbial degradation and risk-based remediation approaches', Environmental Technology & Innovation, 10 175-193 (2018) [C1]
|
|
|
2018 |
Ramadass K, Megharaj M, Venkateswarlu K, Naidu R, 'Bioavailability of weathered hydrocarbons in engine oil-contaminated soil: Impact of bioaugmentation mediated by Pseudomonas spp. on bioremediation', Science of the Total Environment, 636 968-974 (2018) [C1]
Heavier fraction hydrocarbons (C -C ) formed in soil after biotic and abiotic weatherings of engine oil are the continuing constraints in the bioremediation strategy, and their bi... [more]
Heavier fraction hydrocarbons (C -C ) formed in soil after biotic and abiotic weatherings of engine oil are the continuing constraints in the bioremediation strategy, and their bioavailability remains a poorly quantified regulatory factor. In a microcosm study, we used two strains of Pseudomonas, P. putida TPHK-1 and P. aeruginosa TPHK-4, in strategies of bioremediation, viz., natural attenuation, biostimulation and bioaugmentation, for removal of weathered total petroleum hydrocarbons (TPHs) in soil contaminated long-term with high concentrations of engine oil (39,000¿41,000 mg TPHs kg soil). Both the bacterial strains exhibited a great potential in remediating weathered hydrocarbons of engine oil. Addition of inorganic fertilizers (NPK), at recommended levels for bioremediation, resulted in significant inhibition in biostimulation/enhanced natural attenuation as well as bioaugmentation. The data on dehydrogenase activity clearly confirmed those of bioremediation strategies used, indicating that this enzyme assay could serve as an indicator of bioremediation potential of oil-contaminated soil. Extraction of TPHs from engine oil-contaminated soil with hydroxypropyl-ß-cyclodextrin (HPCD), but not 1-butanol, was found reliable in predicting the bioavailability of weathered hydrocarbons. Also, 454 pyrosequencing data were in accordance with those of bioremediation strategies used in the present microcosm study, suggesting the possible use of pyrosequencing in designing approaches for bioremediation. 15 36 -1
|
|
|
2018 |
Desalegn B, Megharaj M, Chen Z, Naidu R, 'Green mango peel-nanozerovalent iron activated persulfate oxidation of petroleum hydrocarbons in oil sludge contaminated soil', Environmental Technology and Innovation, 11 142-152 (2018) [C1]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
2017 |
Megharaj M, Naidu R, 'Soil and brownfield bioremediation', MICROBIAL BIOTECHNOLOGY, 10 1244-1249 (2017) [C1]
|
|
|
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]
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 aff... [more]
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 , NO , 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 exhibited highest sorption capacity among the tested soils except in Hunan soil. The Cd sorption with NO 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. 4 3 4 3 2- - - - - -
|
|
|
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]
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 a... [more]
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 ) 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 ) value for initially measured concentrations after exposure of earthworms to diesel for 28¿days was 916¿±¿10¿mg TPHs kg soil which was equivalent to the nominal (initially added) concentration of 1426¿±¿19¿mg TPHs kg soil. Morphological abnormalities such as clitella swelling and curling were noticed when the measured concentrations of diesel were more than 971¿mg¿kg 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. 50 50 -1 -1 -1
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
2017 |
Mahbub KR, Krishnan K, Naidu R, Andrews S, Megharaj M, 'Mercury toxicity to terrestrial biota', ECOLOGICAL INDICATORS, 74 451-462 (2017) [C1]
|
|
|
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]
|
|
|
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]
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... [more]
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 COO) Pb·3H 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. 3 2 2
|
|
|
2017 |
Kuppusamy S, Venkateswarlu K, Megharaj M, 'Evaluation of nineteen food wastes for essential and toxic elements', International Journal of Recycling of Organic Waste in Agriculture, 6 367-373 (2017) [C1]
Purpose: The study evaluates and provides an overview of the nutritional importance of 19 selected food wastes as aids in human/livestock/soil/plant health. Methods: Nitric acid-d... [more]
Purpose: The study evaluates and provides an overview of the nutritional importance of 19 selected food wastes as aids in human/livestock/soil/plant health. Methods: Nitric acid-digested extracts of food wastes belonging to four different classes (fruits, vegetables, oilseeds and beverages) were analysed for different elements in an inductively coupled plasma mass spectrometer. Results: Our study recommends spent coffee grounds, tea leaves, radish peel, watermelon rind and pineapple skin that contain substantially high concentrations of essential elements such as N, P, K, S and Fe for their use as: (a) substrates for composting, (b) biofertilizers, (c) soil amendments, and (d) bioadsorbents of toxins. Although these food wastes are rich in essential nutrients, we do not suggest them for the preparation of food supplements as they contain non-essential elements in concentrations beyond the human safety limits. However, food wastes like banana peel, plum pomace and pistachio shell that contain low and permissible concentrations of toxic elements can be recommended as dietary supplements for oral intake in spite of their lesser essential elemental composition than the other residues examined. Conclusions: Our study confirms that food wastes are rich sources of essential nutrients and there is need to harness their real industrial systems.
|
|
|
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]
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 na... [more]
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 ) individually and with Zn at two phytotoxic doses. The As pore-water concentration was significantly reduced (df = 289, Adjusted R = 0.84, p < 0.01) in the presence of Zn in the whole dataset, whereas Zn and Zn 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. -1 2 2+
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
Bioelectrochemical remediation (BER) systems such as microbial fuel cells (MFCs) have recently emerged as a green technology for the effective remediation of petroleum hydrocarbon... [more]
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 observation 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.
|
|
|
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]
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 ... [more]
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 , FeCl and Fe(NO ) ) 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 analysis revealed that Chlorella sp. was significantly resistant to iron compared to other microalgae. However, almost 900¿µg¿g iron was accumulated by Chlamydomonas sp. grown with 12¿mg¿L 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. 4 3 3 3 50 -1 -1
|
|
|
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]
|
|
|
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]
|
|
|
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]
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 sy... [more]
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 with an equilibrium sorbent dose of 5 g L 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 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. -1 -1 3+
|
|
|
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]
|
|
|
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]
|
|
|
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]
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 gener... [more]
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 values 4.5 mg L and 44.15 mg L and MIC values 5.1 mg L and 48.48 mg L 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. 50 -1 -1 -1 -1
|
|
|
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]
Diversity, distribution and composition of bacterial community of soils contaminated long-term with both polycyclic aromatic hydrocarbons (PAHs) and heavy metals were explored for... [more]
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.
|
|
|
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]
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 b... [more]
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.
|
|
|
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]
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 bioreme... [more]
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.
|
|
|
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]
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... [more]
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 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 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.]. -1 -1
|
|
|
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 & Francis Group, LLC.Systematic site survey for sample collection and analysis was conducted at a derelict copper (Cu) mine at Kapunda, South Australia. Cu co... [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.
|
|
|
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.
|
|
|
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]
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) h... [more]
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.
|
|
|
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]
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 th... [more]
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.
|
|
|
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]
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... [more]
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 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. s
|
|
|
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]
|
|
|
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]
|
|
|
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]
Treatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentation for field-scale bioremediation of contaminated sites.... [more]
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 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 ) 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. -1 1/2
|
|
|
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]
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 bimeta... [more]
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 and Pd , 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. 2+ 2+
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
We demonstrated SERS (surface-enhanced Raman scattering) detection of fluorosurfactants (FSs), which are commonly formulated in aqueous firefighting foams (AFFFs), by increasing t... [more]
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.
|
|
|
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]
|
|
|
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]
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 anti... [more]
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 ) 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 whereas the induction of superoxide dismutase and catalase was apparent only at 0.06¿g L . 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. -1 -1 -1
|
|
|
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]
|
|
|
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]
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... [more]
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.
|
|
|
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]
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 n... [more]
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 and MIC values. Estimated EC and MIC values in nutrient-rich media and low nutrient media had the following respective recordings ¿ 22.6 mg L ; 23.1 mg L and 1.4 mg L and 1.7 mg L . 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 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. 50 50 -1 -1 -1 -1 -1
|
|
|
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]
Dearth of high molecular weight contaminant degradation, pH tolerance and growth limiting nutrient assimilation potentials of the selected microorganisms are some of the prime fac... [more]
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 ) and HMW PAHs Pyr (100% of 150 mg L ) or BaP (90¿100% of 50 mg L ) in 3, 12¿15 and 30 days, respectively and recorded the least half-life time (t ) 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. -1 -1 -1 1/2
|
|
|
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]
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. T... [more]
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 ) 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 ) 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. -1 -1
|
|
|
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]
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... [more]
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.
|
|
|
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]
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... [more]
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 ) was able to remove 97-99.9% of 250 mg L 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 . 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. -1 -1 -1
|
|
|
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]
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... [more]
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.
|
|
|
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]
Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the existing bioaccessibilit... [more]
Recent decades have seen a growing popularity of in vitro bioaccessibility being utilised as a screening tool in human health risk assessment. However the existing 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.
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
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 s... [more]
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.
|
|
|
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]
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 ... [more]
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 Phe), 4 (150¿mg¿L Pyr) and 5 (50¿mg¿L BaP) ring PAHs in 4, 20 and 30 days, respectively. It could mineralize 90¿100% of PAHs (200¿mg¿L 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 ) and 3 (Cd , Pb , Zn ) mg L of the potentially bioavailable metal ions and over 17¿mg¿L metal levels was lethal for the microbe. Further, it could fix 217¿274¿µg¿mL of N and solubilize 79¿135¿µg¿mL 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. -1 -1 -1 -1 2+ 2+ 2+ 2+ -1 -1 -1 -1
|
|
|
2016 |
Fang C, Chen Z, Megharaj M, Naidu R, 'Potentiometric detection of AFFFs based on MIP', Environmental Technology & Innovation, 5 52-59 (2016) [C1]
|
|
|
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]
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 met... [more]
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 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 of copper resulted in 18 ± 2 mg kg accumulation in its leaf. The calcium accumulation was significant up to 11648 ± 1209 mg kg 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. -1 -1 -1 -1
|
|
|
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]
|
|
|
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]
Perfluorooctanoic acid (PFOA) is a widespread persistent organic contaminant in the environment that has recently raised much of regulatory and public concern. Therefore, assessme... [more]
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.
|
|
|
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]
Crude oil spills resulting from excavation, transportation and downstream processes can cause intensive damage to living organisms and result in changes in the microbial populatio... [more]
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.
|
|
|
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]
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 stud... [more]
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 = 0.26RB + 17.3, R = 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. rat swine 2
|
|
|
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)
|
|
|
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]
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... [more]
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.
|
|
|
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]
In this study, the toxicity, biotransformation and bioaccumulation of arsenite and arsenate in a soil microalga, Chlorella sp., were investigated using different phosphate levels.... [more]
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.
|
|
|
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]
|
|
|
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]
|
|
|
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]
'Biochar' represents an emerging technology that is increasingly being recognized for its potential role in carbon sequestration, reducing greenhouse gas emissions, wast... [more]
'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.
|
|
|
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]
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... [more]
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 ) 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 ) (L/kg). Wheat and cucumber root elongation had R values 0.90 and 0.91 respectively, while cucumber shoot data was 0.79. The K values were related to soil pH and also EC 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. 50 f f 50 2
|
|
|
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]
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 ... [more]
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 = 8.85 L/kg) compared with Cd (K = 1.79 L/kg). However, much less sorption of both Zn (K = 0.19 L/kg) and Cd (K = 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. L L L L
|
|
|
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]
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 t... [more]
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 ) and lowest half-life time (t = 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. -1 1/2
|
|
|
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, met... [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.
|
|
|
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]
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 ... [more]
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.
|
|
|
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]
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 nanofi... [more]
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.
|
|
|
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]
'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... [more]
'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.
|
|
|
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]
|
|
|
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]
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 ... [more]
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 . 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. -1
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
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... [more]
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.
|
|
|
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]
|
|
|
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]
|
|
|
2015 |
Nirola R, Megharaj M, Palanisami T, Aryal R, Venkateswarlu K, Ravi Naidu, 'Evaluation of metal uptake factors of native trees colonizing an abandoned copper mine a quest for phytostabilization', Journal of Sustainable Mining, 14 115-123 (2015)
Accumulation and enrichment of heavy metals in the above ground parts of Australian native Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec) growing in an abandoned copper m... [more]
Accumulation and enrichment of heavy metals in the above ground parts of Australian native Acacia pycnantha (Ap) and Eucalyptus camaldulensis (Ec) growing in an abandoned copper mine located in Kapunda, South Australia have been studied. Cu and other metals (Na, Al, K, Ca, Fe, Zn, Cd and Pb) in plants and corresponding soils were analysed to evaluate plant interaction with soils containing heavy metals. As per the total metal analysis of leaf and corresponding soil samples, Ap accumulated 93.6 mg kg of Cu in leaf while the corresponding soil concentration was 1632 mg kg . The Ec accumulated 5341 mg kg of Cu in leaf while the concentration of this heavy metal in soil was 65 mg kg in soil. The ESEM spectral analysis also showed a high leaf concentration of Cu in Ec (7%) as against only 0.12% in Ap. The average bioconcentration factor for Cu, Zn, Cd and Pb in Ec was much higher than that of Ap. Similarly, enrichment factor was more in Ec for Cu, Zn and Pb than in Ap. In contrast, translocation factor for only Zn and Cd was high in Ap. This study points out that Ec and Ap have different stabilising potential in remediating heavy metals like Cu in mined soils. -1 -1 -1 -1
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
2015 |
Wang Z, Fang C, Mallavarapu M, 'Characterization of iron-polyphenol complex nanoparticles synthesized by Sage (Salvia officinalis) leaves', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 4 92-97 (2015)
|
|
|
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]
Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological receptors remains difficult d... [more]
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.
|
|
|
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]
|
|
|
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]
|
|
|
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]
In this study, we report a facile synthesis of shape controlled three dimensional hydroxyapatite nanostructures (HAp) using a sacrificial thermoplastic polyurethane (TPU) nanofibe... [more]
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.
|
|
|
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]
This study introduced a patented novel methodological system for automatically analysis of Fourier Transform Infrared Spectrometer (FTIR) spectrum data located at 'fingerprin... [more]
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 ), 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). -1
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
2014 |
Jin X, Chen Z, Wang T, Chen Z, Megharaj M, Naidu R, 'Simultaneous removal of co-contaminants: acid brilliant violet and Cu
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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) [C1]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
2014 |
Wang Z, Yu C, Fang C, Mallavarapu M, 'Dye removal using iron-polyphenol complex nanoparticles synthesized by plant leaves', ENVIRONMENTAL TECHNOLOGY & INNOVATION, 1-2 29-34 (2014)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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 189-196 (2014)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
2013 |
Sarkar B, Naidu R, Megharaj M, 'Simultaneous Adsorption of Tri- and Hexavalent Chromium by Organoclay Mixtures', WATER AIR AND SOIL POLLUTION, 224 (2013)
|
|
|
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]
|
|
|
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]
|
|
|
2013 |
Bahar MM, Megharaj M, Naidu R, 'Bioremediation of Arsenic-Contaminated Water: Recent Advances and Future Prospects', WATER AIR AND SOIL POLLUTION, 224 (2013)
|
|
|
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)
|
|
|
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.
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
2012 |
Sudharshan S, Naidu R, Mallavarapu M, Bolan N, 'DDT remediation in contaminated soils: a review of recent studies', BIODEGRADATION, 23 851-863 (2012)
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
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]
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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]
|
|
|
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]
|
|
|
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)
|
|
|
2011 |
Caceres TP, Megharaj M, Naidu R, 'Toxicity and transformation of insecticide fenamiphos to the earthworm Eisenia fetida', ECOTOXICOLOGY, 20 20-28 (2011)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
2010 |
Xi Y, Mallavarapu M, Naidu R, 'Preparation, characterization of surfactants modified clay minerals and nitrate adsorption', APPLIED CLAY SCIENCE, 48 92-96 (2010)
|
|
|
2010 |
Xi Y, Mallavarapu M, Naidu R, 'Adsorption of the herbicide 2,4-D on organo-palygorskite', APPLIED CLAY SCIENCE, 49 255-261 (2010)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
2009 |
Arora M, Megharaj M, Naidu R, 'Arsenic testing field kits: some considerations and recommendations', ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 31 45-48 (2009)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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.
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
2004 |
Singh N, Megharaj M, Kookana RS, Naidu R, Sethunathan N, 'Atrazine and simazine degradation in Pennisetum rhizosphere', CHEMOSPHERE, 56 257-263 (2004)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
1988 |
MEGHARAJ M, VENKATESWARLU K, RAO AS, 'MICROBIAL-DEGRADATION AND ALGAL TOXICITY OF MONOCROTOPHOS AND QUINALPHOS IN FLOODED SOIL', CHEMOSPHERE, 17 1033-1039 (1988)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
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)
|
|
|
|
Meftaul IM, Venkateswarlu K, Dharmarajan R, Annamalai P, Megharaj M, 'Sorption desorption of dimethoate in urban soils and potential environmental impacts', Environmental Science: Processes & Impacts, 22 2256-2265 [C1]
|
|
|
|
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,
|
|
|
|
Shanthakumar S, Abinandan S, Venkateswarlu K, Subashchandrabose SR, Megharaj M, 'Algalization of acid soils with acid-tolerant strains: Improvement in
pH
, carbon content, exopolysaccharides, indole acetic acid and dehydrogenase activity', Land Degradation & Development,
|
|
|
|
Chowdhury MI, Sana T, Panneerselvan L, Dharmarajan R, Megharaj M, 'Acute Toxicity and Trans-Generational Effects of Perfluorobutane Sulfonate (PFBS) in
Caenorhabditis elegans', Environmental Toxicology and Chemistry,
|
|
|