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sulfate reducing bacteria

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https://www.readbyqxmd.com/read/29223893/biogeographic-distribution-of-bacterial-archaeal-and-methanogenic-communities-and-their-associations-with-methanogenic-capacity-in-chinese-wetlands
#1
Jie Zhang, Shuo Jiao, Yahai Lu
Natural wetlands and anthropogenic paddy fields are the dominant biogenic sources of atmospheric methane emission which have been speculated as the most probable sources for the increase of post-2006 atmospheric methane. Regional differences in CH4 emission is possibly due to microbial biogeographic distribution. Here we collected soils from 19 wetlands from different regions in China. The methane production capacity (MPC) was measured for each soil samples and varied from 1.11 to 841.94mg/kg dry soil. High throughput sequencing was employed to investigate the diversity and composition of bacterial, archaeal and methanogenic communities...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29215351/moringa-oleifera-functionalised-sand-reuse-with-non-ionic-surfactant-dodecyl-glucoside
#2
Frances E Williams, Andrew K Lee, Sanaz Orandi, Sarah K Sims, David M Lewis
Moringa oleifera seeds are well known for their ability to cause flocculation in turbid water and facilitate bacterial inhibition. These effects are due to the cationic polypeptide MO2.1, which affects the surface charge of suspended particles and causes lysis of bacterial cells. However, the attachment of bacteria to MO2.1 prevents further bacterial attachment, reducing the effectiveness of the seeds. This research investigated the effect of surfactants on functionality and reuse of Moringa seeds to develop a sustainable water treatment technique...
October 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/29209314/probiotic-strain-lactobacillus-casei-bl23-prevents-colitis-associated-colorectal-cancer
#3
Elsa Jacouton, Florian Chain, Harry Sokol, Philippe Langella, Luis G Bermúdez-Humarán
The gut microbiota plays a major role in intestinal health, and an imbalance in its composition can lead to chronic gut inflammation and a predisposition to developing colorectal cancer (CRC). Currently, the use of probiotic bacteria represents an emerging alternative to treat and prevent cancer. Moreover, consumption of these beneficial bacteria may also favorably modulate the composition of the gut microbiota, which has been described in several studies to play an important role in CRC carcinogenesis. In this context, the aim of this study was to assess the protective effect of oral treatment with Lactobacillus casei BL23, a probiotic strain well known for its anti-inflammatory and anticancer properties...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29204058/diversity-of-bacterial-lactase-genes-in-intestinal-contents-of-mice-with-antibiotics-induced-diarrhea
#4
Cheng-Xing Long, Lu He, Yan-Fang Guo, Ya-Wei Liu, Nen-Qun Xiao, Zhou-Jin Tan
AIM: To investigate the diversity of bacterial lactase genes in the intestinal contents of mice with antibiotics-induced diarrhea. METHODS: Following 2 d of adaptive feeding, 12 specific pathogen-free Kunming mice were randomly divided into the control group and model group. The mouse model of antibiotics-induced diarrhea was established by gastric perfusion with mixed antibiotics (23.33 mL·kg-1·d-1) composed of gentamicin sulfate and cephradine capsules administered for 5 days, and the control group was treated with an equal amount of sterile water...
November 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29197544/control-of-microbial-sulfide-production-by-limiting-sulfate-dispersal-in-a-water-injected-oil-field
#5
Y Shen, A Agrawal, N K Suri, D An, J K Voordouw, R G Clark, T R Jack, K Miner, R Pederzolli, A Benko, G Voordouw
Oil production by water injection often involves the use of makeup water to replace produced oil. Sulfate in makeup water is reduced by sulfate-reducing bacteria to sulfide, a process referred to as souring. In the MHGC field souring was caused by using makeup water with 4mM (384ppm) sulfate. Mixing with sulfate-free produced water gave injection water with 0.8mM sulfate. This was amended with nitrate to limit souring and was then distributed fieldwide. The start-up of an enhanced-oil-recovery pilot caused all sulfate-containing makeup water to be used for dissolution of polymer, which was then injected into a limited region of the field...
November 29, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29197069/polymethoxyflavones-prevent-benzo-a-pyrene-dextran-sodium-sulfate-induced-colorectal-carcinogenesis-through-modulating-xenobiotic-metabolism-and-ameliorate-autophagic-defect-in-icr-mice
#6
Jia-Ching Wu, Mei-Ling Tsai, Ching-Shu Lai, Chih-Yu Lo, Chi-Tang Ho, Ying-Jan Wang, Min-Hsiung Pan
Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental carcinogenic pollutants and they have become an important issue in food contamination. Dietary intake of PAHs has been recognized as a major route of human exposure. However, the mechanisms behind dietary PAH-induced colorectal cancer (CRC) remain unclear. Several studies have shown that polymethoxyflavones (PMFs) are effective in preventing carcinogen-induced CRC or colitis. In this study, we investigated the preventive effect of PMFs on benzo[a]pyrene/dextran sulfate sodium (BaP/DSS)-induced colorectal tumorigenesis in ICR mice...
December 2, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29187682/bacterial-glycerol-oxidation-coupled-to-sulfate-reduction-at-neutral-and-acidic-ph
#7
Sidnei C Santos, Martin G Liebensteiner, Antonie H van Gelder, Mauricio R Dimitrov, Paulo F Almeida, Cristina M Quintella, Alfons J M Stams, Irene Sánchez-Andrea
Glycerol is a main co-product of biodiesel production. Crude glycerol may serve as a cheap and attractive substrate in biotechnological applications, e.g. for the production of valuable chemicals or as an electron donor for reduction processes. In this work, sulfate reduction with glycerol was studied at neutral and acidic pH using bioreactor sludge samples and Tinto River sediments as a source of inoculum, respectively. Communities of sulfate-reducing bacteria (SRB) and fermentative bacteria were co-enriched at both pH values...
November 29, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/29179122/impacts-of-water-quality-on-the-corrosion-of-cast-iron-pipes-for-water-distribution-and-proposed-source-water-switch-strategy
#8
Jun Hu, Huiyu Dong, Qiang Xu, Wencui Ling, Jiuhui Qu, Zhimin Qiang
Switch of source water may induce "red water" episodes. This study investigated the impacts of water quality on iron release, dissolved oxygen consumption (ΔDO), corrosion scale evolution and bacterial community succession in cast iron pipes used for drinking water distribution at pilot scale, and proposed a source water switch strategy accordingly. Three sets of old cast iron pipe section (named BP, SP and GP) were excavated on site and assembled in a test base, which had historically transported blended water, surface water and groundwater, respectively...
October 31, 2017: Water Research
https://www.readbyqxmd.com/read/29179118/performance-improvement-of-a-thermophilic-sulfate-reducing-bioreactor-under-acidogenic-conditions-effects-of-diversified-operating-strategies
#9
Carolina Gil-Garcia, Leandro Augusto Gouvêa de Godoi, Lucas Tadeu Fuess, Marcia Helena Rissato Zamariolli Damianovic
The establishment of a sulfidogenic environment under thermophilic (55 °C) acidogenic conditions was assessed in an innovative structured-bed bioreactor to enhance sulfate removal and acetate production prior to methanogenesis. Diversified operating strategies, i.e., variations in the hydraulic retention time (HRT; 6-12 h), sulfate loading rate (SLR; 8-16 kg SO42- m-3 day-1) and liquid phase recirculation ratio (0.0-57.0) were assessed to both enable the establishment of sulfate-reducing conditions and remove H2S from the liquid phase...
November 24, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29177812/anaerobic-degradation-of-1-methylnaphthalene-by-a-member-of-the-thermoanaerobacteraceae-contained-in-an-iron-reducing-enrichment-culture
#10
Sviatlana Marozava, Housna Mouttaki, Hubert Müller, Nidal Abu Laban, Alexander J Probst, Rainer U Meckenstock
An anaerobic culture (1MN) was enriched with 1-methylnaphthalene as sole source of carbon and electrons and Fe(OH)3 as electron acceptor. 1-Naphthoic acid was produced as a metabolite during growth with 1-methylnaphthalene while 2-naphthoic acid was detected with naphthalene and 2-methylnaphthalene. This indicates that the degradation pathway of 1-methylnaphthalene might differ from naphthalene and 2-methylnaphthalene degradation in sulfate reducers. Terminal restriction fragment length polymorphism and pyrosequencing revealed that the culture is mainly composed of two bacteria related to uncultured Gram-positive Thermoanaerobacteraceae and uncultured gram-negative Desulfobulbaceae...
November 24, 2017: Biodegradation
https://www.readbyqxmd.com/read/29176637/coordinated-response-of-the-desulfovibrio-desulfuricans-27774-transcriptome-to-nitrate-nitrite-and-nitric-oxide
#11
Ian T Cadby, Matthew Faulkner, Jeanne Cheneby, Justine Long, Jacques van Helden, Alain Dolla, Jeffrey A Cole
The sulfate reducing bacterium Desulfovibrio desulfuricans inhabits both the human gut and external environments. It can reduce nitrate and nitrite as alternative electron acceptors to sulfate to support growth. Like other sulphate reducing bacteria, it can also protect itself against nitrosative stress caused by NO generated when nitrite accumulates. By combining in vitro experiments with bioinformatic and RNA-seq data, metabolic responses to nitrate or NO and how nitrate and nitrite reduction are coordinated with the response to nitrosative stress were revealed...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29175692/interpreting-microbiologically-assisted-cracking-with-ee-ph-diagrams
#12
Tangqing Wu, Cheng Sun, Wei Ke
Although many mechanisms have been proposed to explain the microbiologically assisted cracking (MAC) of steel and copper, a theoretical interpretation is necessary. In this paper, we attempt to give a theoretical interpretation of sulfate/nitrate reducing bacteria (SRB/NRB)-assisted cracking using Ee-pH diagrams. Under the combined actions of SRB/NRB and external stress, the cell potential (Ecell) and the corrosion current density of the corrosion reaction increase, such that the corrosion reactions become more thermodynamically favorable...
November 16, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29168130/tolerance-towards-gentamicin-is-a-function-of-nutrient-concentration-in-biofilms-of-patient-isolated-staphylococcus-epidermidis
#13
Christoph G Ammann, David Neuhauser, Claudia Eberl, Michael Nogler, Débora Coraça-Huber
Staphylococcus epidermidis is a biofilm-forming bacterial strain that can cause major problems as an agent of nosocomial infections. Bacteria in biofilms are shielded from the environment and can survive high doses of antibiotics. We here test the antibiotic susceptibility of Staphylococcus epidermidis to rising gentamicin concentrations in optimal growth conditions as used in routine bacteriology laboratories with low nutrient situations as suggested to be found in clinical situations. We found that gentamicin-resistant Staphylococcus epidermidis biofilms survived in the absence of external nutrient supply in PBS...
November 22, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/29163420/microbial-diversity-and-community-structure-of-sulfate-reducing-and-sulfur-oxidizing-bacteria-in-sediment-cores-from-the-east-china-sea
#14
Yu Zhang, Xungong Wang, Yu Zhen, Tiezhu Mi, Hui He, Zhigang Yu
Sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB) have been studied extensively in marine sediments because of their vital roles in both sulfur and carbon cycles, but the available information regarding the highly diverse SRB and SOB communities is not comprehensive. High-throughput sequencing of functional gene amplicons provides tremendous insight into the structure and functional potential of complex microbial communities. Here, we explored the community structure, diversity, and abundance of SRB and SOB simultaneously through 16S rRNA, dsrB and soxB gene high-throughput sequencing and quantitative PCR analyses of core samples from the East China Sea...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29160034/free-living-chemoautotrophic-and-particle-attached-heterotrophic-prokaryotes-dominate-microbial-assemblages-along-a-pelagic-redox-gradient
#15
Elizabeth A Suter, Maria Pachiadaki, Gordon T Taylor, Yrene Astor, Virginia P Edgcomb
Using the anoxic Cariaco Basin as a natural laboratory, particle association of bacterial and archaeal taxa was assessed by iTag sequencing and qPCR gene assays of samples spanning an oxic-anoxic-euxinic gradient. Ten to twelve percent of all bacterial and archaeal cells were found in the particle-associated (PA) fraction, operationally defined as prokaryotes captured on 2.7µm membranes. Both redox condition and size fraction segregated bacterial taxa. Archaeal taxa varied according to redox conditions, but were similar between size fractions...
November 21, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29160027/identification-of-syntrophobacteraceae-as-major-acetate-degrading-sulfate-reducing-bacteria-in-italian-paddy-soil
#16
Pengfei Liu, Bianca Pommerenke, Ralf Conrad
Methane is an important greenhouse gas and acetate is the most important intermediate (average 70%) of the carbon flow to CH4 in paddy fields. Sulfate (e.g., gypsum) application can reduce CH4 emissions up to 70%. However, the effect of gypsum application on acetate degradation and the microbial communities involved are unclear. Therefore, we studied acetate-dependent sulfate reduction in anoxic microcosms of Italian rice paddy soil, combining profiling of 16S rRNA and dissimilatory sulfite reductase (dsrB) genes and transcripts and rRNA based stable isotope probing (SIP) analysis...
November 21, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29156259/biochar-and-nitrate-reduce-risk-of-methylmercury-in-soils-under-straw-amendment
#17
Yue Zhang, Yu-Rong Liu, Pei Lei, Yong-Jie Wang, Huan Zhong
There is growing evidence that incorporating crop straw into soils, which is being widely encouraged in many parts of the world, could increase net methylmercury (MeHg) production in soils and MeHg accumulation in crops. We explored the possibility of mitigating the risk of increased MeHg levels under straw amendment by transforming straw into biochar (BC). Greenhouse and batch experiments were conducted, in which soil MeHg concentrations, MeHg phytoavailability and accumulation in rice, dynamics of sulfate, nitrate and abundances of sulfate reducing bacteria (SRB) were compared in 'Control' (Hg contaminated soil), 'Straw' (soil with 1% rice straw), 'Straw+BC' (soil with 1% straw and 1% biochar), and 'Straw+BC+N' (soil with 1% straw, 1% biochar and 0...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149671/silver-nanoparticles-stimulate-the-proliferation-of-sulfate-reducing-bacterium-desulfovibrio-vulgaris
#18
Zhaoyu Chen, Ji Lu, Shu-Hong Gao, Min Jin, Philip L Bond, Ping Yang, Zhiguo Yuan, Jianhua Guo
The intensive use of silver nanoparticles (AgNPs) in cosmetics and textiles causes their release into sewer networks of urban water systems. Although a few studies have investigated antimicrobial activities of nanoparticles against environmental bacteria, little is known about potential impacts of the released AgNPs on sulfate reducing bacteria in sewers. Here, we investigated the effect of AgNPs on Desulfovibrio vulgaris Hidenborough (D. vulgaris), a typical sulfate-reducing bacterium (SRB) in sewer systems...
November 8, 2017: Water Research
https://www.readbyqxmd.com/read/29145133/simultaneous-treatment-of-dimethyl-disulfide-and-hydrogen-sulfide-in-an-alkaline-biotrickling-filter
#19
Luis Arellano-García, Sylvie Le Borgne, Sergio Revah
Foul odors comprise generally a complex mixture of molecules, where reduced sulfur compounds play a key role due to their toxicity and low odor threshold. Previous reports on treating mixtures of sulfur compounds in single biofilters showed that hydrogen sulfide (H2S) interferes with the removal and degradation of other sulfur compounds. In this study, hydrogen sulfide (H2S) and dimethyl disulfide (DMDS) were fed to an alkaline biotrickling filter (ABTF) at pH 10, to evaluate the simultaneous removal of inorganic and organic sulfur compounds in a single, basic-pH system...
October 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/29133429/microbial-pathway-for-anaerobic-5-methylthioadenosine-metabolism-coupled-to-ethylene-formation
#20
Justin A North, Anthony R Miller, John A Wildenthal, Sarah J Young, F Robert Tabita
Numerous cellular processes involving S-adenosyl-l-methionine result in the formation of the toxic by-product, 5'-methylthioadenosine (MTA). To prevent inhibitory MTA accumulation and retain biologically available sulfur, most organisms possess the "universal" methionine salvage pathway (MSP). However, the universal MSP is inherently aerobic due to a requirement of molecular oxygen for one of the key enzymes. Here, we report the presence of an exclusively anaerobic MSP that couples MTA metabolism to ethylene formation in the phototrophic bacteria Rhodospirillum rubrum and Rhodopseudomonas palustris In vivo metabolite analysis of gene deletion strains demonstrated that this anaerobic MSP functions via sequential action of MTA phosphorylase (MtnP), 5-(methylthio)ribose-1-phosphate isomerase (MtnA), and an annotated class II aldolase-like protein (Ald2) to form 2-(methylthio)acetaldehyde as an intermediate...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
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