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https://www.readbyqxmd.com/read/29337910/network-based-methods-for-identifying-key-active-proteins-in-the-extracellular-electron-transfer-process-in-shewanella-oneidensis-mr-1
#1
Dewu Ding, Xiao Sun
Shewanella oneidensis MR-1 can transfer electrons from the intracellular environment to the extracellular space of the cells to reduce the extracellular insoluble electron acceptors (Extracellular Electron Transfer, EET). Benefiting from this EET capability, Shewanella has been widely used in different areas, such as energy production, wastewater treatment, and bioremediation. Genome-wide proteomics data was used to determine the active proteins involved in activating the EET process. We identified 1012 proteins with decreased expression and 811 proteins with increased expression when the EET process changed from inactivation to activation...
January 16, 2018: Genes
https://www.readbyqxmd.com/read/29332277/efficient-degradation-of-triclosan-by-an-endophytic-fungus-penicillium-oxalicum-b4
#2
Hao Tian, Yan Jun Ma, Wan Yi Li, Jian Wen Wang
Triclosan (TCS), a widely used antimicrobial and preservative agent, is an emerging contaminant in aqueous and soil environment. Microbial degradation of TCS has not been reported frequently because of its inhibition of microbe growth. To explore the new microbial resources for TCS biodegradation, fungal endophytes were isolated and screened for the degradation potential. The endophytic strain B4 isolated from Artemisia annua L. showed higher degradation efficiency and was identified as Penicillium oxalicum based on its morphology and ITS sequences of ribosomal DNA...
January 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29331851/rhizospheric-microorganisms-as-a-solution-for-the-recovery-of-soils-contaminated-by-petroleum-a-review
#3
REVIEW
Jéssica Janzen Dos Santos, Leila Teresinha Maranho
Petroleum is currently the world's main energy source, and its demand is expected to increase in coming years. Its intense exploitation can lead to an increase in the number of environmental accidents, such as spills and leaks, and an increase in the generation of environmental liabilities resulting from refining. Due to its hydrophobic characteristics and slow process of biodegradation, petroleum can remain in the environment for a long time and its toxicity can cause a negative impact on both terrestrial and aquatic ecosystems, with the main negative effects related to its carcinogenic potential for both animals and humans...
January 11, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29331716/bioremediation-of-cadmium-and-zinc-contaminated-soil-using-rhodobacter-sphaeroides
#4
Weihua Peng, Xiaomin Li, Jingxiang Song, Wei Jiang, Yingying Liu, Wenhong Fan
Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Rhodobacter sphaeroides was used to bioremediate soils contaminated with cadmium (Cd) and zinc (Zn). The study found that the treatment reduced the overall bioavailable fractions (e.g., exchangeable and carbonate bound phases) of Cd and Zn. More stable fractions (e.g., Fe-Mn oxide, organic bound, and residual phases (only for Zn)) increased after bioremediation. A wheat seedling experiment revealed that the phytoavailability of Cd was reduced after bioremediation using R...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29330185/the-mgte-homolog-fici-acts-as-a-secondary-ferrous-iron-importer-in-shewanella-oneidensis-strain-mr-1
#5
Brittany D Bennett, Kaitlyn E Redford, Jeffrey A Gralnick
The transport of metals into and out of cells is necessary for the maintenance of appropriate intracellular concentrations. Metals are needed for incorporation into metalloproteins but become toxic at higher concentrations. Many metal transport proteins have been discovered in bacteria, including the Mg2+ transporter-E (MgtE) family of passive Mg2+/Co2+ cation-selective channels. Low sequence identity exists between members of the MgtE family, indicating that substrate specificity may differ among MgtE transporters...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29329096/water-contamination-by-endocrine-disruptors-impacts-microbiological-aspects-and-trends-for-environmental-protection
#6
REVIEW
Caren Leite Spindola Vilela, João Paulo Bassin, Raquel Silva Peixoto
Hormone active agents constitute a dangerous class of pollutants. Among them, those agents that mimic the action of estrogens on target cells and are part of the group of endocrine-disruptor compounds (EDCs) are termed estrogenic EDCs, the main focus of this review. Exposure to these compounds causes a number of negative effects, including breast cancer, infertility and animal hermaphroditism. However, especially in underdeveloped countries, limited efforts have been made to warn people about this serious issue, explain the methods of minimizing exposure, and develop feasible and efficient mitigation strategies at different levels and in various environments...
January 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29329004/contemporary-enzyme-based-technologies-for-bioremediation-a-review
#7
REVIEW
Babita Sharma, Arun Kumar Dangi, Pratyoosh Shukla
The persistent disposal of xenobiotic compounds like insecticides, pesticides, fertilizers, plastics and other hydrocarbon containing substances is the major source of environmental pollution which needs to be eliminated. Many contemporary remediation methods such as physical, chemical and biological are currently being used, but they are not sufficient to clean the environment. The enzyme based bioremediation is an easy, quick, eco-friendly and socially acceptable approach used for the bioremediation of these recalcitrant xenobiotic compounds from the natural environment...
January 9, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29328931/biostimulation-and-bioaugmentation-of-native-microbial-community-accelerated-bioremediation-of-oil-refinery-sludge
#8
Ajoy Roy, Avishek Dutta, Siddhartha Pal, Abhishek Gupta, Jayeeta Sarkar, Ananya Chatterjee, Anumeha Saha, Poulomi Sarkar, Pinaki Sar, Sufia K Kazy
Scope for developing an engineered bioremediation strategy for the treatment of hydrocarbon-rich petroleum refinery waste was investigated through biostimulation and bioaugmentation approaches. Enhanced (46-55%) total petroleum hydrocarbon (TPH) attenuation was achieved through phosphate, nitrate or nitrate+phosphate amendment in the sludge with increased (upto 12%) abundance of fermentative, hydrocarbon degrading, sulfate-reducing, CO2-assimilating and methanogenic microorganisms (Bacillus, Coprothermobacter, Rhodobacter, Pseudomonas, Achromobacter, Desulfitobacter, Desulfosporosinus, T78, Methanobacterium, Methanosaeta, etc)...
January 3, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29324386/effects-of-two-ecological-earthworm-species-on-atrazine-degradation-performance-and-bacterial-community-structure-in-red-soil
#9
Zhong Lin, Zhen Zhen, Lei Ren, Jiewen Yang, Chunling Luo, Laiyuan Zhong, Hanqiao Hu, Yanqiu Liang, Yongtao Li, Dayi Zhang
Vermicomposting is an effective and environmentally friendly approach for eliminating soil organic contamination. Atrazine is one of the most commonly applied triazinic herbicides and frequently detected in agricultural soils. This study investigated the roles and mechanisms of two earthworm species (epigeic Eisenia foetida and endogeic Amynthas robustus) in microbial degradation of atrazine. Both earthworms accelerated atrazine degradation performance from 39.0% in sterile soils to 94.9%-95.7%, via neutralizing soil pH, consuming soil humus, altering bacterial community structure, enriching indigenous atrazine degraders and excreting the intestinal atrazine-degrading bacteria...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29324323/multidisciplinary-characterization-of-u-vi-sequestration-by-acidovorax-facilis-for-bioremediation-purposes
#10
E Krawczyk-Bärsch, U Gerber, K Müller, H Moll, A Rossberg, R Steudtner, M L Merroun
The contamination of the environment by U may affect plant life and consequently may have an impact on animal and human health. The present work describes U(VI) sequestration by Acidovorax facilis using a multidisciplinary approach combining wet chemistry, transmission electron microscopy, and spectroscopy methods (e.g. cryo-time resolved laser-induced fluorescence spectroscopy, extended X-ray absorption fine structure spectroscopy, and in-situ attenuated total reflection Fourier transform infrared spectroscopy)...
December 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29321101/bioremediation-and-detoxification-of-industrial-wastes-by-earthworms-vermicompost-as-powerful-crop-nutrient-in-sustainable-agriculture
#11
REVIEW
Sartaj Ahmad Bhat, Sharanpreet Singh, Jaswinder Singh, Sunil Kumar, Bhawana, Adarsh Pal Vig
Vermicompost is the final product of the vermicomposting process involving the collective action of earthworms and microbes. During this process, the waste is converted into useful manure by reducing the harmful effects of waste. Toxicity of industrial wastes is evaluated by plant bioassays viz. Allium cepa and Vicia faba test. These bioassays are sensitive and cost-effective for the monitoring of environmental contamination. The valorization potential of earthworms and their ability to detoxify heavy metals in industrial wastes is because of their strong metabolic system and involvement of earthworm gut microbes and chloragocyte cells...
January 3, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29319522/characterization-of-microbial-communities-in-acidified-sulfur-containing-soils
#12
Grzegorz Czerwonka, Iwona Konieczna, Paulina Żarnowiec, Artur Zieliński, Agnieszka Malinowska-Gniewosz, Agnieszka Gałuszka, Zdzisław Migaszewski, Wiesław Kaca
Over a period of three years, microbial communities in acidified soil with high sulfur content were analyzed. In soil water extracts ureolytic, proteolytic, oxidoreductive, and lipolytic activity were detected. The presented results indicate that the enzymatic activity of soil microbial communities varied considerably over time. Isolated 26 (80%) bacterial strains belonged to genus Bacillus sp. and were identified by cultivation and 16S rRNA methods. The commercially available procedures for bacterial DNA isolation from acidified soil failed, therefore a new, specific DNA isolation method was established...
December 4, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/29316464/comparison-of-tolerance-and-biosorption-of-three-trace-metals-cd-cu-pb-by-the-soil-fungus-absidia-cylindrospora
#13
Quentin Albert, Lydia Leleyter, Mélanie Lemoine, Natacha Heutte, Jean-Philippe Rioult, Lucile Sage, Fabienne Baraud, David Garon
Trace metals cause deterioration of the soil and constitute a major concern for the environment and human health. Bioremediation could be an effective solution for the rectification of contaminated soils. Fungi could play an important role in biodegradation because of the morphology of their mycelium (highly reactive and extensive biological surface) and its physiology (high tolerance to many stresses, production of enzymes and secondary metabolites). Fungi can effectively biosequestrate, or biotransform many organic and inorganic contaminants into a non-bioavailable form...
December 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29316021/bacillus-probiotics-an-alternative-to-antibiotics-for-livestock-production
#14
REVIEW
S Mingmongkolchai, W Panbangred
The use of probiotics as feed supplements in animal production has increased considerably over the last decade, particularly since the ban on antibiotic growth promoters (AGPs) in the livestock sector. Several Bacillus spp. are attractive for use as probiotic supplements in animal feed due to their ability to produce spores. Their heat stability and ability to survive the low pH of the gastric barrier represent an advantage over other probiotic microorganisms. This review discusses important characteristics required for selection of Bacillus probiotic strains and summarizes the beneficial effect of Bacillus-based feed additives on animal production...
January 9, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29313451/microcystin-lr-degradation-utilizing-a-novel-effective-indigenous-bacterial-community-yfmcd1-from-lake-taihu
#15
Fei Yang, Isaac Yaw Massey, Jian Guo, Shu Yang, Yuepu Pu, Weiming Zeng, Hongzhuan Tan
Microcystins (MC) produced by species of cyanobacteria including Microcystis, Anabaena, and Aphanizomenon are a group of monocyclic hepatotoxins posing serious threat to public health. Microcystin-LR (MC-LR) is the most toxic and frequently encountered microcystin variant in the environment, and thus removal of this toxin using bacteria was shown to be a reliable, efficient, and cost-effective method that avoids utilization of chemicals that may produce potentially harmful by-products. The aim of this study was to determine whether a novel indigenous bacterial community designated YFMCD1 was effective in destroying MC...
January 9, 2018: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/29306813/rhodococcus-wratislaviensis-strain-9-an-efficient-p-nitrophenol-degrader-with-a-great-potential-for-bioremediation
#16
Suresh R Subashchandrabose, Kadiyala Venkateswarlu, Kannan Krishnan, Ravi Naidu, Robin Lockington, Mallavarapu Megharaj
A Gram-positive bacterium, Rhodococcus wratislaviensis strain 9, was isolated from groundwater contaminated with nitrophenolics and trichloroethene following enrichment culture technique. The cells of strain 9 grown on LB broth (uninduced) degraded 720 μM p-nitrophenol (PNP) within 12 h, and utilized as a source of carbon and energy. Orthogonal experimental design analysis to determine optimal conditions for biodegradation of PNP showed that pH had a significant positive effect (P ≤ .05) on bacterial degradation of PNP, while glucose, di- and tri-nitrophenols exhibited significant negative effect...
December 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29306127/bioremediation-of-congo-red-dye-in-immobilized-batch-and-continuous-packed-bed-bioreactor-by-brevibacillus-parabrevis-using-coconut-shell-bio-char
#17
Md Abu Talha, Mandavi Goswami, B S Giri, Anjaney Sharma, B N Rai, R S Singh
In the present study, bacterial species capable of degrading colour waste were isolated from the water bodies located near the carpet cluster in the Bhadohi district of U.P., India. Among the isolated species best one was selected on the basis of its capability to degrade Congo red in batch experiments using NaCl-Yeast as the nutrient media and further it was identified as Brevibacillus parabrevis using 16S rDNA sequencing. The process parameters were optimized for maximum degradation in batch experiments and found out to be: Inoculum size: 3 ml, Temperature: 30 °C, Time: 6 days leading to a removal of 95...
December 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29304415/biodegradation-and-detoxification-of-aliphatic-and-aromatic-hydrocarbons-by-new-yeast-strains
#18
Mohamed Hashem, Saad A Alamri, Sharefah S A A Al-Zomyh, Sulaiman A Alrumman
Seeking new efficient hydrocarbon-degrading yeast stains was the main goal of this study. Because microorganisms are greatly affected by the environmental factors, the biodegradation potentiality of the microorganisms varies from climatic area to another. This induces research to develop and optimize the endemic organisms in bioremediation technology. In this study, 67 yeast strains were tested for their growth potentiality on both aliphatic and aromatic hydrocarbons. The most efficient six strains were identified using sequence analysis of the variable D1/D2 domain of the large subunit 26S ribosomal DNA...
January 2, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29302994/environmental-impact-and-bioremediation-of-seleniferous-soils-and-sediments
#19
Shrutika L Wadgaonkar, Yarlagadda V Nancharaiah, Giovanni Esposito, Piet N L Lens
Selenium concentrations in the soil environment are directly linked to its transfer in the food chain, eventually causing either deficiency or toxicity associated with several physiological dysfunctions in animals and humans. Selenium bioavailability depends on its speciation in the soil environment, which is mainly influenced by the prevailing pH, redox potential, and organic matter content of the soil. The selenium cycle in the environment is primarily mediated through chemical and biological selenium transformations...
January 5, 2018: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/29302823/biodegradation-of-sulfonamides-by-shewanella-oneidensis-mr-1-and-shewanella-sp-strain-mr-4
#20
Fei Mao, Xiaohong Liu, Kang Wu, Chen Zhou, Youbin Si
Because of extensive sulfonamides application in aquaculture and animal husbandry and the consequent increase in sulfonamides discharged into the environment, strategies to remediate sulfonamide-contaminated environments are essential. In this study, the resistance of Shewanella oneidensis MR-1 and Shewanella sp. strain MR-4 to the sulfonamides sulfapyridine (SPY) and sulfamethoxazole (SMX) were determined, and sulfonamides degradation by these strains was assessed. Shewanella oneidensis MR-1 and Shewanella sp...
January 4, 2018: Biodegradation
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