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Bioremediation

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https://www.readbyqxmd.com/read/28921965/mycelium-enhanced-bacterial-degradation-of-organic-pollutants-under-bioavailability-restrictions
#1
Rungroch Sungthong, Margalida Tauler, Magdalena Grifoll, Jose-Julio Ortega-Calvo
This work examines the role of mycelia in enhancing the degradation by attached bacteria of organic pollutants that have poor bioavailability. Two oomycetes, Pythium oligandrum and Pythium aphanidermatum, were selected as producers of mycelial networks, while Mycobacterium gilvum VM552 served as a model polycyclic aromatic hydrocarbon (PAH)-degrading bacterium. The experiments consisted of bacterial cultures exposed to a non-disturbed non-aqueous phase liquid (NAPL) layer containing a heavy fuel spiked with 14C-labeled phenanthrene that were incubated in the presence or absence of the mycelia of the oomycetes in both shaking and static conditions...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28920150/molecular-basis-of-cd-2-stress-response-in-candida-tropicalis
#2
Zaman Khan, Abdul Rehman, Muhammad Atif Nisar, Saima Zafar, Syed Zajif Hussain, Inga Zerr, Irshad Hussain, Muhammad Waseem, Muhammad Arif
This study examines the bioremediation potential and cadmium-induced cellular response on a molecular level in Candida tropicalis 3Aer. Spectroscopic analysis clearly illustrated the involvement of yeast cell wall components in biosorption. Cadmium bioaccumulation was confirmed by TEM, SEM, and EDX examination. TEM images revealed extracellular as well as cytoplasmic and vacuolar cadmium nanoparticle formation, further validated by presence of ycf1 gene and increased biosynthesis of GSH under cadmium stress...
September 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28918337/ecotoxicological-and-microbiological-assessment-of-sewage-sludge-associated-with-sugarcane-bagasse
#3
Lais Roberta Deroldo Sommaggio, Dânia Elisa Christofoletti Mazzeo, Débora de Andrade E Silva Sant' Anna, Carlos Emílio Levy, Maria Aparecida Marin-Morales
Sewage sludge (SS) obtained after sewage treatment process may contain several toxic substances. Bioremediation can decrease the toxicity of the sludge, mainly when it is associated with stimulant agents, such as sugarcane bagasse (B). Samples of pure SS (SSP); SS+B; SS+Soil; and SS+B+Soil were bioremediated for 1, 3, and 6 months (T1, T2, and T3, respectively). After each period, the cytotoxic, genotoxic, and mutagenic potentials of the solid samples and their respective aqueous extracts (aqueous eluate and percolate water) were evaluated by the Allium cepa test...
September 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28916278/microbial-reduction-of-vanadium-v-in-groundwater-interactions-with-coexisting-common-electron-acceptors-and-analysis-of-microbial-community
#4
Hui Liu, Baogang Zhang, Heyang Yuan, Yutong Cheng, Song Wang, Zhen He
Vanadium (V) pollution in groundwater has posed serious risks to the environment and public health. Anaerobic microbial reduction can achieve efficient and cost-effective remediation of V(V) pollution, but its interactions with coexisting common electron acceptors such as NO3(-), Fe(3+), SO4(2-) and CO2 in groundwater remain unknown. In this study, the interactions between V(V) reduction and reduction of common electron acceptors were examined with revealing relevant microbial community and identifying dominant species...
September 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28915476/microbial-remediation-of-fluoride-contaminated-water-via-a-novel-bacterium-providencia-vermicola-kx926492
#5
Shraboni Mukherjee, Priyanka Sahu, Gopinath Halder
The present study emphasizes on the isolation, identification and characterization of a fluoride-resistant bacteria from contaminated groundwater of a severely affected rural area. The isolate was investigated for its possible role towards bioremediation of fluoride. Bacterial growth was determined by various carbon and nitrogen sources. Influence of parameters like initial fluoride concentration (5-25 mg L(-1)), pH (3-9) and temperature (15-42 °C) on fluoride removal by Providencia sp. KX926492 were also examined...
September 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28913631/comparative-proteomic-analysis-and-characterization-of-benzo-a-pyrene-removal-by-microbacterium-sp-strain-m-csw3-under-denitrifying-conditions
#6
Wei Qin, FuQiang Fan, Yi Zhu, Yingying Wang, Xiang Liu, Aizhong Ding, Junfeng Dou
High-molecular-weight polycyclic aromatic hydrocarbons are persistent organic pollutants with great environmental and human health risks and the associated bioremediation activities have always been hampered by the lack of powerful bacterial species under redox conditions. A Microbacterium sp. strain capable of using benzo(a)pyrene as sole carbon and energy sources under denitrifying conditions was isolated. The difference in protein expression during BaP removal and removal characterization were investigated...
September 14, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28911269/applicability-of-two-dimensional-surface-model-in-bacterial-biosorption-system-an-advanced-approach-in-bioremediation-of-metal-ions
#7
Vishal Mishra
The surface of Bacillus VMSDCM accession no. HQ108109 has been characterized at various pH values of the experimental solution. The boundary values of conditional parameter were used to develop a mathematical six lumped stochastic model for studying the surface chemistry of the bacterium cells. The results of the model were statistically analyzed to understand the strength of the proposed model. The simulation of the model was performed in Turbo C++ interface. The convergence values of the model were recorded and all the asymptotic points were neglected...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28904741/complete-genome-of-arthrobacter-alpinus-strain-r3-8-bioremediation-potential-unraveled-with-genomic-analysis
#8
Wah-Seng See-Too, Robson Ee, Yan-Lue Lim, Peter Convey, David A Pearce, Taznim Begam Mohd Mohidin, Wai-Fong Yin, Kok Gan Chan
Arthrobacter alpinus R3.8 is a psychrotolerant bacterial strain isolated from a soil sample obtained at Rothera Point, Adelaide Island, close to the Antarctic Peninsula. Strain R3.8 was sequenced in order to help discover potential cold active enzymes with biotechnological applications. Genome analysis identified various cold adaptation genes including some coding for anti-freeze proteins and cold-shock proteins, genes involved in bioremediation of xenobiotic compounds including naphthalene, and genes with chitinolytic and N-acetylglucosamine utilization properties and also plant-growth-influencing properties...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28904413/hexavalent-chromium-reduction-from-pollutant-samples-by-achromobacter-xylosoxidans-shb-204-and-its-kinetics-study
#9
Swapna Tadishetty Hanumanth Rao, Narendra Kumar Papathoti, Ravi Gundeboina, Yahya Khan Mohamed, Gopal Reddy Mudhole, Hameeda Bee
Cr(VI) is most toxic heavy metal and second most widespread hazardous metal compound worldwide. Present work focused on Cr(VI) reduction from synthetic solutions and polluted samples by Achromobacter xylosoxidans SHB 204. It could tolerate Cr(VI) up to 1600 ppm and reduce 500 ppm with 4.5 chromium reductase enzyme units (U) having protein size 30 kDa. Changes in morphology of cells on interaction with Cr(VI) metal ion was also studied using SEM-EDX and FTIR. Microcosm studies in pollutant samples for Cr(VI) reduction and adsorption isotherm with biomass of bacterium was best fitted with Langmuir model along with kinetic studies...
September 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28904262/biodegradation-of-volatile-organic-compounds-and-their-effects-on-biodegradability-under-co-existing-conditions
#10
Miho Yoshikawa, Ming Zhang, Koki Toyota
Volatile organic compounds (VOCs) are major pollutants that are found in contaminated sites, particularly in developed countries such as Japan. Various microorganisms that degrade individual VOCs have been reported, and genomic information related to their phylogenetic classification and VOC-degrading enzymes is available. However, the biodegradation of multiple VOCs remains a challenging issue. Practical sites, such as chemical factories, research facilities, and illegal dumping sites, are often contaminated with multiple VOCs...
September 12, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28903604/remediation-of-contaminated-soils-by-biotechnology-with-nanomaterials-bio-behavior-applications-and-perspectives
#11
Xiaomin Gong, Danlian Huang, Yunguo Liu, Zhiwei Peng, Guangming Zeng, Piao Xu, Min Cheng, Rongzhong Wang, Jia Wan
Soil contamination caused by heavy metals and organic pollutants has drawn world-wide concern. Biotechnology has been applied for many years to the decontamination of soils polluted with organic and inorganic contaminants, and novel nanomaterials (NMs) has attracted much concern due to their high capacity for the removal/stabilization/degradation of pollutants. Recently, developing advanced biotechnology with NMs for the remediation of contaminated soils has become a hot research topic. Some researchers found that bioremediation efficiency of contaminated soils was enhanced by the addition of NMs, while others demonstrated that the toxicity of NMs to the organism negatively influenced the repair capacity of polluted soils...
September 13, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28900776/haloarchaea-worth-exploring-for-their-biotechnological-potential
#12
REVIEW
Aparna Singh, Anil K Singh
Halophilic archaea are unique microorganisms adapted to survive under high salt conditions and biomolecules produced by them may possess unusual properties. Haloarchaeal metabolites are stable at high salt and temperature conditions that are useful for industrial applications. Proteins and enzymes of this group of archaea are functional under salt concentrations at which bacterial counterparts fail to be active. Such properties makes haloarchaeal enzymes suitable for salt-based applications and their use under dehydrating conditions...
September 12, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28900256/genomic-and-transcriptomic-analysis-of-the-toluene-degrading-black-yeast-cladophialophora-immunda
#13
Barbara Blasi, Hakim Tafer, Christina Kustor, Caroline Poyntner, Ksenija Lopandic, Katja Sterflinger
Cladophialophora immunda is an ascomycotal species belonging to the group of the black yeasts. These fungi have a thick and melanized cell wall and other physiological adaptations that allows them to cope with several extreme physical and chemical conditions. Member of the group can colonize some of the most extremophilic environments on Earth. Cladophialophora immunda together with a few other species of the order Chaetothyriales show a special association with hydrocarbon polluted environments. The finding that the fungus is able to completely mineralize toluene makes it an interesting candidate for bioremediation purposes...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900110/enhancement-of-environmental-hazard-degradation-in-the-presence-of-lignin-a-proteomics-study
#14
Su Sun, Shangxian Xie, Yanbing Cheng, Hongbo Yu, Honglu Zhao, Muzi Li, Xiaotong Li, Xiaoyu Zhang, Joshua S Yuan, Susie Y Dai
Proteomics studies of fungal systems have progressed dramatically based on the availability of more fungal genome sequences in recent years. Different proteomics strategies have been applied toward characterization of fungal proteome and revealed important gene functions and proteome dynamics. Presented here is the application of shot-gun proteomic technology to study the bio-remediation of environmental hazards by white-rot fungus. Lignin, a naturally abundant component of the plant biomass, is discovered to promote the degradation of Azo dye by white-rot fungus Irpex lacteus CD2 in the lignin/dye/fungus system...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898947/soil-enzyme-dynamics-in-chlorpyrifos-treated-soils-under-the-influence-of-earthworms
#15
Juan C Sanchez-Hernandez, J Notario Del Pino, Yvan Capowiez, Christophe Mazzia, Magali Rault
Earthworms contribute, directly and indirectly, to contaminant biodegradation. However, most of bioremediation studies using these annelids focus on pollutant dissipation, thus disregarding the health status of the organism implied in bioremediation as well as the recovery of indicators of soil quality. A microcosm study was performed using Lumbricus terrestris to determine whether earthworm density (2 or 4individuals/kg wet soil) and the time of exposure (1, 2, 6, 12, and 18wk) could affect chlorpyrifos persistence in soil initially treated with 20mg active ingredientkg(-1) wet soil...
September 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28898788/molecular-modelling-and-quantum-biochemistry-computations-of-a-naturally-occurring-bioremediation-enzyme-alkane-hydroxylase-from-pseudomonas-putida-p1
#16
B G de Sousa, J I N Oliveira, E L Albuquerque, U L Fulco, V E Amaro, C A G Blaha
Many species of bacteria involved in degradation of n-alkanes have an important constitutional metabolic enzyme, the alkane hydroxylase called AlkB, specialized in the conversion of hydrocarbons molecules that can be used as carbon and/or energy source. This enzyme plays an important role in the microbial degradation of oil, chlorinated hydrocarbons, fuel additives, and many other compounds. A number of these enzymes has been biochemically characterized in detail because the potential of alkane hydroxylases to catalyse high added-value reactions is widely recognized...
September 1, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28895357/-bioremediation-of-oil-contaminated-field-by-two-pseudomonas-aeruginosa-strains
#17
Lei Huang, Tingting Zhao, Yun He, Yilin Liu, Chang Liu, Dayao Jin, Xiaoqiang Jia
We studied the remediation of petroleum-contaminated soils. Two Pseudomonas aeruginosa strains were screened from soil samples in the mine environment. The degradation rate of crude oil was 95.67% after 10 days by mixed culture of the two strains, which was 32% higher than that of single bacterium. It means that the two bacteria had synergistic effect on degrading crude oil. Based on the result, bacterial agent was prepared, and the oil pollution sites were artificially constructed to simulate the degradation of crude oil under different operating conditions...
June 25, 2017: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/28895046/characterization-of-cadmium-resistant-klebsiella-pneumoniae-mcc-3091-promoted-rice-seedling-growth-by-alleviating-phytotoxicity-of-cadmium
#18
Krishnendu Pramanik, Soumik Mitra, Anumita Sarkar, Tithi Soren, Tushar Kanti Maiti
Cadmium (Cd) phytotoxicity in agricultural land is a major global concern now-a-days resulting in very poor yield. Plant growth-promoting rhizobacteria (PGPR)-mediated bioremediation is one of the convenient strategies for detoxification of Cd from the soil and for plant growth promotion under Cd stress. The selected strain K5 was identified as Klebsiella pneumoniae based on MALDI-TOF MS ribosomal protein and 16S rDNA sequence-based homology. The strain possessed several PGP traits viz. IAA production (3413 μg/mL), phosphate solubilization (80...
September 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28894951/structural-and-functional-characterization-of-mercuric-reductase-from-lysinibacillus-sphaericus-strain-g1
#19
Amit Bafana, Farha Khan, Kaza Suguna
In response to the widespread presence of inorganic Hg in the environment, bacteria have evolved resistance systems with mercuric reductase (MerA) as the key enzyme. MerA enzymes have still not been well characterized from gram positive bacteria. Current study reports physico-chemical, kinetic and structural characterization of MerA from a multiple heavy metal resistant strain of Lysinibacillus sphaericus, and discusses its implications in bioremediation application. The enzyme was homodimeric with subunit molecular weight of about 60 kDa...
September 11, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28894442/isolation-and-characterization-of-phenanthrene-degrading-bacteria-from-diesel-fuel-contaminated-antarctic-soils
#20
Alejandro Gran-Scheuch, Edwar Fuentes, Denisse M Bravo, Juan Cristobal Jiménez, José M Pérez-Donoso
Antarctica is an attractive target for human exploration and scientific investigation, however the negative effects of human activity on this continent are long lasting and can have serious consequences on the native ecosystem. Various areas of Antarctica have been contaminated with diesel fuel, which contains harmful compounds such as heavy metals and polycyclic aromatic hydrocarbons (PAH). Bioremediation of PAHs by the activity of microorganisms is an ecological, economical, and safe decontamination approach...
2017: Frontiers in Microbiology
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