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Bioremediation

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https://www.readbyqxmd.com/read/28648638/polymeric-pollutant-biodegradation-through-microbial-oxidoreductase-a-better-strategy-to-safe-environment
#1
REVIEW
Muhammad Ishtiaq Ali, Nazia Khatoon, Asif Jamal
The detoxification of xenobiotic organic compounds by various microorganisms through oxidative coupling is facilitated with oxidoreductases. With the help of energy yielding biochemical reactions, these microbes extract energy for their metabolic pathway. They promote the transfer of electrons from a reduced organic substrate to another chemical compound. During such oxidation-reduction reactions, the toxic polymeric substance is finally oxidized into harmless compounds. Enzymatic bioremediation of toxic organic pollutant is a very effective strategy in complex environmental conditions...
June 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28648395/the-complete-genome-of-the-tetrachloroethene-respiring-epsilonproteobacterium-sulfurospirillum-halorespirans
#2
Tobias Goris, Benjamin Schenz, Johannes Zimmermann, Mikael Lemos, Jörg Hackermüller, Torsten Schubert, Gabriele Diekert
Sulfurospirillum halorespirans is a bacterium that couples the reductive dehalogenation of chlorinated ethenes to growth. This process is called organohalide respiration (OHR), which can be of importance for bioremediation. Here, we report the complete genome of S. halorespirans, the second one of an organohalide-respiring Epsilonproteobacterium after that of Sulfurospirillum multivorans. With both genomes at hand, we were able to ascertain that the genomic region encoding OHR proteins in Epsilonproteobacteria differs from that found in organohalide-respiring bacteria (OHRB) affiliated to other phyla and that the production of a unique cobamide, norpseudo-B12, might not be limited to the model organism S...
June 22, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28647602/improvement-of-lindane-removal-by-streptomyces-sp-m7-by-using-stable-microemulsions
#3
Juliana Maria Saez, Verena Casillas García, Claudia Susana Benimeli
Lindane is an organochlorine pesticide which persists in the environment and can cause serious health problems due to its chlorinated and hydrophobic nature. Microemulsions are isotropic and macroscopically homogeneous systems with high solubilization capacity of hydrophilic and hydrophobic compounds. The aim of this study was to evaluate the removal of high concentrations of lindane by the actinobacterium Streptomyces sp. M7 in aqueous and soil systems in the presence of stable microemulsions. Three stable microemulsions were successfully formed with Tween 80, 1-pentanol and three vegetable oils...
June 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28647306/complete-genome-sequence-of-a-phthalic-acid-esters-degrading-mycobacterium-sp-yc-rl4
#4
Lei Ren, Shuanghu Fan, Junhuan Wang, Nahurira Ruth, Cheng Qiao, Yang Jia, Yanchun Yan
Mycobacterium sp. YC-RL4 is capable of utilizing a broad range of phthalic acid esters (PAEs) as sole source of carbon and energy for growth. The preliminary studies demonstrated its high degrading efficiency and good performance during the bioprocess with environmental samples. Here, we present the complete genome of Mycobacterium sp. YC-RL4, which consists of one circular chromosome (5,801,417bp) and one plasmid (252,568bp). The genomic analysis and gene annotation were performed and many potential genes responsible for the biodegradation of PAEs were identified from the genome...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28646447/microbial-transformations-of-selenite-by-methane-oxidizing-bacteria
#5
Abdurrahman S Eswayah, Thomas J Smith, Andreas C Scheinost, Nicole Hondow, Philip H E Gardiner
Methane-oxidizing bacteria are well known for their role in the global methane cycle and their potential for microbial transformation of wide range of hydrocarbon and chlorinated hydrocarbon pollution. Recently, it has also emerged that methane-oxidizing bacteria interact with inorganic pollutants in the environment. Here, we report what we believe to be the first study of the interaction of pure strains of methane-oxidizing bacteria with selenite. Results indicate that the commonly used laboratory model strains of methane-oxidizing bacteria, Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b, are both able to reduce the toxic selenite (SeO3(2-)) but not selenate (SeO4(2-)) to red spherical nanoparticulate elemental selenium (Se(0)), which was characterized via energy-dispersive X-ray spectroscopy (EDXS), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)...
June 23, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28646313/domestic-wastewater-treatment-by-constructed-wetlands-enhanced-with-bioremediating-rhizobacteria
#6
Irina Salgado, Herlen Cárcamo, María Elena Carballo, Mario Cruz, María Del Carmen Durán
Constructed wetlands (CWs) offer several advantages for treating waters; however, the successful application of these systems remains a challenge. Practical solutions to pollution through CWs remain incipient because wetlands are still studied as "black boxes"; further studies are required regarding the involvement of rhizosphere bacteria in the removal of pollutants. This research focused on increasing the performance of CWs treatment systems for the removal of inorganic and organic pollutants from domestic wastewater, by the application of native bioremediating rhizobacteria...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28645031/understanding-the-variation-of-microbial-community-in-heavy-metals-contaminated-soil-using-high-throughput-sequencing
#7
Honghong Guo, Mubasher Nasir, Jialong Lv, Yunchao Dai, Jiakai Gao
To improve the understanding of bacterial community in heavy metals contaminated soils, we studied the effects of environmental factors on the bacterial community structure in contaminated fields located in Shaanxi Province of China. Our results showed that microbial community structure varied among sites, and it was significantly affected by soil environmental factors such as pH, soil organic matter (SOM), Cd, Pb and Zn. In addition, Spearman's rank-order correlation indicated heavy metal sensitive (Ralstonia, Gemmatimona, Rhodanobacter and Mizugakiibacter) and tolerant (unidentified-Nitrospiraceae, Blastocatella and unidentified-Acidobacteria) microbial groups...
June 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28643961/bioelectroventing-an-electrochemical-assisted-bioremediation-strategy-for-cleaning-up-atrazine-polluted-soils
#8
Ainara Domínguez-Garay, Jose Rodrigo Quejigo, Ulrike Dörfler, Reiner Schroll, Abraham Esteve-Núñez
The absence of suitable terminal electron acceptors (TEA) in soil might limit the oxidative metabolism of environmental microbial populations. Bioelectroventing is a bioelectrochemical strategy that aims to enhance the biodegradation of a pollutant in the environment by overcoming the electron acceptor limitation and maximizing metabolic oxidation. Microbial electroremediating cells (MERCs) are devices that can perform such a bioelectroventing. We also report an overall profile of the (14) C-ATR metabolites and (14) C mass balance in response to the different treatments...
June 23, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28641883/petroleum-oil-removal-by-immobilized-bacterial-cells-on-polyurethane-foam-under-different-temperature-conditions
#9
Mauricio J Alessandrello, María S Juárez Tomás, Enzo E Raimondo, Diana L Vullo, Marcela A Ferrero
In this work, a mixed biofilm composed by Pseudomonas monteilii P26 and Gordonia sp. H19 was formed using polyurethane foam (PUF) as immobilization support, for crude oil removal from artificial sea water. Fresh immobilized cells and immobilized cells that were stored at 4°C for two months before use were assessed. The oil removal assays were carried out at microcosm scale at 4, 15 and 30°C. A viability loss of P. monteilii P26 was observed after the storage. The highest removal value (75%) was obtained at 30°C after 7days using fresh immobilized cells on PUF...
June 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633064/an-innovative-approach-to-bioremediation-of-mercury-contaminated-soils-from-industrial-mining-operations
#10
Damien McCarthy, Grant C Edwards, Mae S Gustin, Andrew Care, Matthieu B Miller, Anwar Sunna
Soils contaminated with mercury (Hg) have proved expensive and logistically difficult to remediate. Research continues into finding suitable environmentally-friendly and efficient ways of achieving this end. Bioremediation is an option, which employs the strategies microorganisms have evolved to deal with Hg. One microbial strategy involves uptake and intracellular volatilisation of mercuric ions, which passively diffuse from the cell and back into the atmosphere. In this work, Pseudomonas veronii cells grown to stationary phase were immobilised in a xanthan gum-based biopolymer via encapsulation...
June 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28629972/characterization-of-dioxygenases-and-biosurfactants-produced-by-crude-oil-degrading-soil-bacteria
#11
Santhakumar Muthukamalam, Sivalingam Sivagangavathi, Dharmapal Dhrishya, Sadras Sudha Rani
Role of microbes in bioremediation of oil spills has become inevitable owing to their eco friendly nature. This study focused on the isolation and characterization of bacterial strains with superior oil degrading potential from crude-oil contaminated soil. Three such bacterial strains were selected and subsequently identified by 16S rRNA gene sequence analysis as Corynebacterium aurimucosum, Acinetobacter baumannii and Microbacterium hydrocarbonoxydans respectively. The specific activity of catechol 1,2 dioxygenase (C12O) and catechol 2,3 dioxygenase (C23O) was determined in these three strains wherein the activity of C12O was more than that of C23O...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28629096/synthesis-of-magnetic-nanoparticles-and-their-dispersions-with-special-reference-to-applications-in-biomedicine-and-biotechnology
#12
REVIEW
R V Mehta
Biomedical and biotechnological applications of magnetic nanoparticles and their dispersions in liquids are found to be potentially useful. An exponential growth in publications of papers, reviews and patents has been observed. Possibilities of their indiscriminate use on individual as well as environmental health hazards are also investigated. Still, there appears to be a good scope for further research work in the field. Even a small improvement either in preparation method or development of novel nanoparticles may prove to be beneficial in longer run...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628978/a-high-throughput-dye-reducing-photometric-assay-for-evaluating-microbial-exoelectrogenic-ability
#13
Xiang Xiao, Qiu-Yue Liu, Ting-Ting Li, Feng Zhang, Wen-Wei Li, Xiang-Tong Zhou, Mei-Ying Xu, Qian Li, Han-Qing Yu
Exoelectrogenic bacteria (EEB) can transfer electrons to extracellular electron acceptors and have wide applications in environmental bioremediation and bioenergy generation. Thus, methods for effectively probing the exoelectrogenic ability of EEB are highly desirable. In this work, a simple but efficient photometric assay based on the extracellular reduction of high polar dyes was developed to evaluate the microbial exoelectrogenic ability. Methyl orange were proven to be used as a probe for evaluating the exoelectrogenic ability of EEB...
June 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28626761/bioremediation-of-mercury-by-vibrio-fluvialis-screened-from-industrial-effluents
#14
Kailasam Saranya, Arumugam Sundaramanickam, Sudhanshu Shekhar, Sankaran Swaminathan, Thangavel Balasubramanian
Thirty-one mercury-resistant bacterial strains were isolated from the effluent discharge sites of the SIPCOT industrial area. Among them, only one strain (CASKS5) was selected for further investigation due to its high minimum inhibitory concentration of mercury and low antibiotic susceptibility. In accordance with 16S ribosomal RNA gene sequences, the strain CASKS5 was identified as Vibrio fluvialis. The mercury-removal capacity of V. fluvialis was analyzed at four different concentrations (100, 150, 200, and 250 μg/ml)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28625866/genome-analysis-of-crude-oil-degrading-franconibacter-pulveris-strain-dj34-revealed-its-genetic-basis-for-hydrocarbon-degradation-and-survival-in-oil-contaminated-environment
#15
Siddhartha Pal, Anirban Kundu, Tirtha Das Banerjee, Balaram Mohapatra, Ajoy Roy, Riddha Manna, Pinaki Sar, Sufia K Kazy
Franconibacter pulveris strain DJ34, isolated from Duliajan oil fields, Assam, was characterized in terms of its taxonomic, metabolic and genomic properties. The bacterium showed utilization of diverse petroleum hydrocarbons and electron acceptors, metal resistance, and biosurfactant production. The genome (4,856,096bp) of this strain contained different genes related to the degradation of various petroleum hydrocarbons, metal transport and resistance, dissimilatory nitrate, nitrite and sulfite reduction, chemotaxy, biosurfactant synthesis, etc...
June 15, 2017: Genomics
https://www.readbyqxmd.com/read/28625566/advances-in-bioremediation-of-1-4-dioxane-contaminated-waters
#16
Shu Zhang, Phillip B Gedalanga, Shaily Mahendra
1,4-Dioxane is a contaminant of emerging concern that has been found widespread in groundwater, surface water, and drinking water environments. Many states are implementing lower regulatory advisory levels based on the toxicological profile of 1,4-dioxane and the potential public health risks. However, the unique chemical properties of 1,4-dioxane, such as high water solubility, low Henry's law constant, and importantly, the co-occurrence with chlorinated solvents and other contaminants, increase the challenges to efficiently cleanup 1,4-dioxane...
June 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28623493/bioremediation-of-palm-industry-wastes-using-vermicomposting-technology-its-environmental-application-as-green-fertilizer
#17
Parveen Fatemeh Rupani, Asha Embrandiri, Mahamd Hakimi Ibrahim, Mohammad Shahadat, Sune Balle Hansen, Nur Naha Abu Mansor
Several technologies are being applied for treatment of palm oil mill wastes. Among them, the biological treatments (vermicomposting) have widely been recognized as one of the most efficient and eco-friendly methods for converting organic waste materials into valuable products. The present study focuses on vermicomposting of acidic palm oil mill effluent (POME) mixed with the palm pressed fibre (PPF) which are found difficult to decompose in the environment. The industrial waste (POME) was vermicomposted using Lumbricus rubellus under laboratory conditions for a period of 45 days...
July 2017: 3 Biotech
https://www.readbyqxmd.com/read/28622987/bioremediation-using-gracilaria-lemaneiformis-to-manage-the-nitrogen-and-phosphorous-balance-in-an-integrated-multi-trophic-aquaculture-system-in-yantian-bay-china
#18
Zhangliang Wei, Jiaguo You, Hailong Wu, Fangfang Yang, Lijuan Long, Qiao Liu, Yuanzi Huo, Peimin He
To reduce negative environmental impacts from human aquaculture activities, the red alga Gracilaria lemaneiformis was co-cultured with the fish Pseudosciaena crocea in an integrated multi-trophic aquaculture (IMTA) system for 35d in Yantian Bay. The eutrophication index value decreased from 14.5 to 8.4 after seaweeds were co-cultured in cage farming areas, which indicated that the eutrophic water column in Yantian Bay could be mediated by IMTA. Total DIN and DIP of the tidal input and output were 9.23kg, 0...
June 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28621547/endophytic-bacteria-enhance-remediation-of-tannery-effluent-in-constructed-wetlands-vegetated-with-leptochloa-fusca
#19
Sobia Ashraf, Muhammad Afzal, Muhammad Naveed, Muhammad Shahid, Zahir Ahmad Zahir
The use of constructed wetlands (CWs) is a promising approach for the remediation of wastewater. The present study aims to develop a plant-bacterial system within CWs for efficient remediation of tannery effluent. In a vertical flow CW vegetated with Leptochloa fusca (Kallar grass), a consortium of three different endophytic bacteria, Pantoea stewartii ASI11, Microbacterium arborescens HU33, and Enterobacter sp. HU38, was used for bioaugmentation. Constructed wetlands vegetated with only L. fusca had the potential to remediate tannery effluent, but augmentation with endophytic bacteria enhanced the growth of L...
June 16, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28618357/visualisation-study-on-pseudomonas-migulae-an-1-transport-in-saturated-porous-media
#20
Dan Qu, Hejun Ren, Rui Zhou, Yongsheng Zhao
Influence of granular size and groundwater flow rate on transport of Pseudomonas migulae AN-1 in saturated porous media was non-invasively and visually investigated with a novel imaging technique based on our previously established green fluorescent protein-tagging approach. AN-1 was transported faster than water was. The finer the media were, the greater the enhancement of bacterial velocity was. Mass recovery (MR) increased, while deposition rate coefficient (Kc) decreased, with increasing granular size. Similar and linear trends of MR and Kc, respectively, were quantitatively observed with increasing water flow rate...
June 7, 2017: Water Research
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