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sulfate reducing bacteria

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https://www.readbyqxmd.com/read/28821807/sulfate-reduction-in-sediments-produces-high-levels-of-chromophoric-dissolved-organic-matter
#1
Jenna L Luek, Kaitlyn E Thompson, Randolph K Larsen, Andrew Heyes, Michael Gonsior
Sulfate reduction plays an important role in altering dissolved organic matter (DOM) in estuarine and coastal sediments, although its role in the production of optically active chromophoric DOM (CDOM) and a subset of fluorescent DOM (FDOM) has not been previously investigated in detail. Freshwater sediment slurries were incubated anaerobically with added sulfate and acetate to promote sulfate-reducing bacteria. Ultraviolet visible (UV-Vis) absorbance and 3-dimensional excitation emission matrix (EEM) fluorescence spectra were measured over a five weeks anaerobic dark incubation period...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820122/desulfosarcina-widdelii-sp-nov-and-desulfosarcina-alkanivorans-sp-nov-hydrocarbon-degrading-sulfate-reducing-bacteria-isolated-from-marine-sediment-and-emended-description-of-the-genus-desulfosarcina
#2
Miho Watanabe, Yuriko Higashioka, Hisaya Kojima, Manabu Fukui
In previous studies, two hydrocarbon-degrading sulfate-reducing bacteria, strains PP31T and PL12T, were obtained from oil-polluted marine sediments of Shuaiba, Kuwait. They had been reported as organisms capable of anaerobic degradation of p-xylene and n-alkanes, respectively. The 16S rRNA gene sequence of strain PP31T showed 98.8 % sequence similarities to that of Desulfosarcina variabilis'Montpellier'T. Strains PL12T had 97.8 % of sequence similarity to Desulfosarcina ovata oXys1T. They both have been partially characterized, but not been validly published as new species of the genus Desulfosarcina...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28805891/increasing-corn-distillers-solubles-alters-the-liquid-fraction-of-the-ruminal-microbiome
#3
J C McCann, J R Segers, H Derakhshani, T L Felix, E Khafipour, D W Shike
Five ruminally fistulated steers were used in a 5 × 5 Latin square design to determine the effects of increasing dietary fat and sulfur from condensed distiller's solubles (CDS) on the ruminal microbiome. Treatments included a corn-based control (CON) and 4 levels of CDS (0, 10, 19, and 27%) in a coproduct-based (corn gluten feed and soybean hulls) diet. Fat concentrations were 1.79, 4.43, 6.80, and 8.91% for diets containing 0, 10, 19, and 27% CDS, respectively. Steers were fed for ad libitum intake once daily...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28803152/bioassessment-of-heavy-metal-toxicity-and-enhancement-of-heavy-metal-removal-by-sulfate-reducing-bacteria-in-the-presence-of-zero-valent-iron
#4
Jing Guo, Yong Kang, Ying Feng
A simple and valid toxicity evaluation of Zn(2+), Mn(2+) and Cr(6+) on sulfate-reducing bacteria (SRB) and heavy metal removal were investigated using the SRB system and SRB+Fe(0) system. The heavy metal toxicity coefficient (β) and the heavy metal concentration resulting in 50% inhibition of sulfate reduction (I) from a modeling process were proposed to evaluate the heavy metal toxicity and nonlinear regression was applied to search for evaluation indices β and I. The heavy metal toxicity order was Cr(6+) > Mn(2+) > Zn(2+)...
August 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28800363/the-viability-of-lytic-bacteriophage-%C3%AE-d5-in-potato-associated-environments-and-its-effect-on-dickeya-solani-in-potato-solanum-tuberosum-l-plants
#5
Robert Czajkowski, Anna Smolarska, Zofia Ozymko
Dickeya solani is one of the most important pectinolytic phytopathogens responsible for high losses in potato, especially in seed potato production in Europe. Lytic bacteriophages can affect the structure of the host population and may influence spread, survival and virulence of the pathogen and in consequence, infection of the plant. In this study, we aimed to acquire information on the viability of the broad host lytic bacteriophage ΦD5 on potato, as well as to apprehend the specific effect of this bacteriophage on its host D...
2017: PloS One
https://www.readbyqxmd.com/read/28799940/experimental-study-on-treating-agate-dyeing-wastewater-with-sulfate-reducing-bacteria-strengthening-peanut-shells-and-scrap-iron
#6
Junzhen Di, Mingxin Wang
To solve the problems of high concentrations of Cr(6+), SO4(2-) and H(+) in agate dyeing industrial wastewater and heavy pollution and high treating cost, single-factor and orthogonal experiments were conducted to determine the optimum particle size, the ratio of adsorbents dosing and hydraulic retention time based on peanut shells and scrap iron. Experiments, using five dynamic columns filled with the peanut shells, scrap iron and sulfate-reducing bacteria (SRB), were also conducted to determine the effect and mechanism of treating the wastewater...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28780359/change-regularity-of-water-quality-parameters-in-leakage-flow-conditions-and-their-relationship-with-iron-release
#7
Jingqing Liu, Huabin Shentu, Huanyu Chen, Ping Ye, Bing Xu, Yifu Zhang, Hamid Bastani, Hongxi Peng, Lei Chen, Tuqiao Zhang
The long-term stagnation in metal water supply pipes, usually caused by intermittent consumption patterns, will cause significant iron release and water quality deterioration, especially at the terminus of pipelines. Another common phenomenon at the terminus of pipelines is leakage, which is considered helpful by allowing seepage of low-quality drinking water resulting from long-term stagnation. In this study, the effect of laminar flow on alleviating water quality deterioration under different leakage conditions was investigated, and the potential thresholds of the flow rate, which can affect the iron release process, were discussed...
July 16, 2017: Water Research
https://www.readbyqxmd.com/read/28780357/impact-of-macrozoobenthic-bioturbation-and-wind-fluctuation-interactions-on-net-methylmercury-in-freshwater-lakes
#8
Peifang Wang, Yu Yao, Chao Wang, Jun Hou, Jin Qian, Lingzhan Miao
The methylmercury (MeHg) as the toxic fractions has presented significant threats to biota in freshwater ecosystems. Hg methylation process is demonstrated to be manipulated by biota process (benthic disturbance and algae bloom existence) as well as the abiotic influence (wind fluctuation and illumination intensity) in freshwater ecosystems. However, the mechanisms influencing Hg methylation are still unclear, and the coupled influences of the biotic and abiotic process with the shifts in variation on methylmercury remain unexplored...
July 31, 2017: Water Research
https://www.readbyqxmd.com/read/28777963/biochar-accelerates-microbial-reductive-debromination-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47-in-anaerobic-mangrove-sediments
#9
Juan Chen, Chao Wang, Ying Pan, Shazia Shyla Farzana, Nora Fung-Yee Tam
A common congener of polybrominated diphenyl ethers, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), is a prevalent, persistent and toxic pollutant. It could be removed by reduction debromination by microorganisms but the rate is often slow. The study hypothesized that spent mushroom substrate derived biochar amendment could accelerate the microbial reductive debromination of BDE-47 in anaerobic mangrove sediment slurries and evaluated the mechanisms behind. At the end of 20-week experiment, percentages of residual BDE-47 in slurries amended with biochar were significantly lower but debromination products were higher than those without biochar...
July 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28771598/impacts-of-leachates-from-livestock-carcass-burial-and-manure-heap-sites-on-groundwater-geochemistry-and-microbial-community-structure
#10
Man Jae Kwon, Seong-Taek Yun, Baknoon Ham, Jeong-Ho Lee, Jun-Seop Oh, Weon-Wha Jheong
We investigated the impacts of leachates from a swine carcass burial site and a cow manure heap on the geochemical and microbiological properties of agricultural water samples, including leachate, groundwater from monitoring wells and background wells, and stream water. The leachate from the livestock burial site showed extremely high electrical conductivity, turbidity, and major ion concentrations, but low redox potential and dissolved oxygen levels. The groundwater in the monitoring wells adjacent to both sites showed severe contamination from the leachate, as indicated by the increases in EC, turbidity, Cl-, and SO42-...
2017: PloS One
https://www.readbyqxmd.com/read/28769906/effect-of-nickel-and-cobalt-on-methanogenic-enrichment-cultures-and-role-of-biogenic-sulfide-in-metal-toxicity-attenuation
#11
Lara M Paulo, Javier Ramiro-Garcia, Simon van Mourik, Alfons J M Stams, Diana Z Sousa
Metals play an important role in microbial metabolism by acting as cofactors for many enzymes. Supplementation of biological processes with metals may result in improved performance, but high metal concentrations are often toxic to microorganisms. In this work, methanogenic enrichment cultures growing on H2/CO2 or acetate were supplemented with trace concentrations of nickel (Ni) and cobalt (Co), but no significant increase in methane production was observed in most of the tested conditions. However, high concentrations of these metals were detrimental to methanogenic activity of the cultures...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28768219/removal-of-antimonate-from-wastewater-by-dissimilatory-bacterial-reduction-role-of-the-coexisting-sulfate
#12
Yanping Zhu, Min Wu, Naiyun Gao, Wenhai Chu, Na An, Qiongfang Wang, Shuaifeng Wang
The priority pollutant antimony (Sb) exists primarily as Sb(V) and Sb(III) in natural waters, and Sb(III) is generally with greater mobility and toxicity than Sb(V). The bio-reduction of Sb(V) would not become a meaningful Sb-removal process unless the accumulation of produced dissolved Sb(III) could be controlled. Here, we examined the dissimilatory antimonate bio-reduction with or without the coexistence of sulfate using Sb-acclimated biomass. Results demonstrated that 0.8mM Sb(V) was almost completely bio-reduced within 20h along with 48...
July 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28766244/sulfur-cycling-and-the-intestinal-microbiome
#13
REVIEW
Larry L Barton, Nathaniel L Ritz, Guy D Fauque, Henry C Lin
In this review, we focus on the activities transpiring in the anaerobic segment of the sulfur cycle occurring in the gut environment where hydrogen sulfide is produced. While sulfate-reducing bacteria are considered as the principal agents for hydrogen sulfide production, the enzymatic desulfhydration of cysteine by heterotrophic bacteria also contributes to production of hydrogen sulfide. For sulfate-reducing bacteria respiration, molecular hydrogen and lactate are suitable as electron donors while sulfate functions as the terminal electron acceptor...
August 1, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28765215/methane-fueled-syntrophy-through-extracellular-electron-transfer-uncovering-the-genomic-traits-conserved-within-diverse-bacterial-partners-of-anaerobic-methanotrophic-archaea
#14
Connor T Skennerton, Karuna Chourey, Ramsunder Iyer, Robert L Hettich, Gene W Tyson, Victoria J Orphan
The anaerobic oxidation of methane by anaerobic methanotrophic (ANME) archaea in syntrophic partnership with deltaproteobacterial sulfate-reducing bacteria (SRB) is the primary mechanism for methane removal in ocean sediments. The mechanism of their syntrophy has been the subject of much research as traditional intermediate compounds, such as hydrogen and formate, failed to decouple the partners. Recent findings have indicated the potential for extracellular electron transfer from ANME archaea to SRB, though it is unclear how extracellular electrons are integrated into the metabolism of the SRB partner...
August 1, 2017: MBio
https://www.readbyqxmd.com/read/28744268/intestinal-anti-inflammatory-effects-of-outer-membrane-vesicles-from-escherichia-coli-nissle-1917-in-dss-experimental-colitis-in-mice
#15
María-José Fábrega, Alba Rodríguez-Nogales, José Garrido-Mesa, Francesca Algieri, Josefa Badía, Rosa Giménez, Julio Gálvez, Laura Baldomà
Escherichia coli Nissle 1917 (EcN) is a probiotic strain with proven efficacy in inducing and maintaining remission of ulcerative colitis. However, the microbial factors that mediate these beneficial effects are not fully known. Gram-negative bacteria release outer membrane vesicles (OMVs) as a direct pathway for delivering selected bacterial proteins and active compounds to the host. In fact, vesicles released by gut microbiota are emerging as key players in signaling processes in the intestinal mucosa. In the present study, the dextran sodium sulfate (DSS)-induced colitis mouse model was used to investigate the potential of EcN OMVs to ameliorate mucosal injury and inflammation in the gut...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28735386/the-performance-and-microbial-communities-of-biodegradation-electron-transfer-with-sulfur-metabolism-integrated-process-for-flue-gas-desulfurization-wastewater-treatment
#16
Chao Wei, Wenjie He, Li Wei, Jun Ma, Chunying Li
The biodegradation-electron transfer with sulfur metabolism integrated (BESI(®)) process was used for the treatment of real flue gas desulfurization wastewater. The BESI(®) process consists of an anaerobic activated sludge reactor, an anoxic activated sludge reactor, and an aerobic bio-film reactor. The performance of the integrated process was evaluated by the removal efficiencies of organics and nitrogen pollutants. The sulfate in the wastewater was used as an abundant sulfur source to drive the integrated process...
July 22, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28732725/isolation-of-polysaccharides-from-malva-aegyptiaca-and-evaluation-of-their-antioxidant-and-antibacterial-properties
#17
Nahed Fakhfakh, Ola Abdelhedi, Hamida Jdir, Moncef Nasri, Nacim Zouari
This study investigated the antioxidant and antibacterial properties of crude water-soluble polysaccharides extracted from the mallow (Malva aegyptiaca) by precipitation with cetylpyridinium chloride (P1) or ethanol (P2). The Polysaccharides fractions were characterized by FTIR spectroscopy, a monosaccharide composition, and antioxidant and antibacterial activities. P1 showed the highest total sugars (81.2%) and sulfated groups (2.9%) contents but with the lowest total proteins content (8.7%). The infrared spectroscopic spectra exhibited the typical bands and peak characteristic of polysaccharides...
July 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28729646/climate-oscillations-reflected-within-the-microbiome-of-arabian-sea-sediments
#18
William D Orsi, Marco J L Coolen, Cornelia Wuchter, Lijun He, Kuldeep D More, Xabier Irigoien, Guillem Chust, Carl Johnson, Jordon D Hemingway, Mitchell Lee, Valier Galy, Liviu Giosan
Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial. In sediments underlying the Arabian Sea oxygen minimum zone (OMZ), we performed the first metagenomic profiling of sedimentary DNA at centennial-scale resolution in the context of a multi-proxy paleoclimate reconstruction...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720728/disguised-as-a-sulfate-reducer-growth-of-the-deltaproteobacterium-desulfurivibrio-alkaliphilus-by-sulfide-oxidation-with-nitrate
#19
Casper Thorup, Andreas Schramm, Alyssa J Findlay, Kai W Finster, Lars Schreiber
This study demonstrates that the deltaproteobacterium Desulfurivibrio alkaliphilus can grow chemolithotrophically by coupling sulfide oxidation to the dissimilatory reduction of nitrate and nitrite to ammonium. Key genes of known sulfide oxidation pathways are absent from the genome of D. alkaliphilus Instead, the genome contains all of the genes necessary for sulfate reduction, including a gene for a reductive-type dissimilatory bisulfite reductase (DSR). Despite this, growth by sulfate reduction was not observed...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28719849/selective-cathodic-microbial-biofilm-retention-allows-a-high-current-to-sulfide-efficiency-in-sulfate-reducing-microbial-electrolysis-cells
#20
Guillermo Pozo, Yang Lu, Sebastien Pongy, Jürg Keller, Pablo Ledezma, Stefano Freguia
Selective microbial retention is of paramount importance for the long-term performance of cathodic sulfate reduction in microbial electrolysis cells (MECs) due to the slow growth rate of autotrophic sulfate-reducing bacteria. In this work, we investigate the biofilm retention and current-to-sulfide conversion efficiency using carbon granules (CG) or multi-wall carbon nanotubes deposited on reticulated vitreous carbon (MWCNT-RVC) as electrode materials. For ~2months, the MECs were operated at sulfate loading rates of 21 to 309gSO4 -S/m(2)/d...
July 12, 2017: Bioelectrochemistry
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