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sulfate reducing bacteria

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https://www.readbyqxmd.com/read/27917954/regional-variations-in-the-diversity-and-predicted-metabolic-potential-of-benthic-prokaryotes-in-coastal-northern-zhejiang-east-china-sea
#1
Kai Wang, Xiansen Ye, Huajun Zhang, Heping Chen, Demin Zhang, Lian Liu
Knowledge about the drivers of benthic prokaryotic diversity and metabolic potential in interconnected coastal sediments at regional scales is limited. We collected surface sediments across six zones covering ~200 km in coastal northern Zhejiang, East China Sea and combined 16 S rRNA gene sequencing, community-level metabolic prediction, and sediment physicochemical measurements to investigate variations in prokaryotic diversity and metabolic gene composition with geographic distance and under local environmental conditions...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27914001/subtilosin-prevents-biofilm-formation-by-inhibiting-bacterial-quorum-sensing
#2
Ammar Algburi, Saskia Zehm, Victoria Netrebov, Anzhelica B Bren, Vladimir Chistyakov, Michael L Chikindas
Subtilosin, the cyclic lantibiotic protein produced by Bacillus subtilis KATMIRA1933, targets the surface receptor and electrostatically binds to the bacterial cell membrane. In this study, subtilosin was purified using ammonium sulfate ((NH4)2SO4) precipitation and purified via column chromatography. Subtilosin's antibacterial minimum and sub-minimum inhibitory concentrations (MIC and sub-MIC) and anti-biofilm activity (biofilm prevention) were established. Subtilosin was evaluated as a quorum sensing (QS) inhibitor in Gram-positive bacteria using Fe(III) reduction assay...
December 2, 2016: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/27910828/biofilm-prevention-of-gram-negative-bacterial-pathogens-involved-in-periprosthetic-infection-by-antibiotic-loaded-calcium-sulfate-beads-in-vitro
#3
Robert P Howlin, Christopher Winnard, Connor J Frapwell, Jeremy S Webb, John J Cooper, Sean S Aiken, Paul Stoodley
Biofilm formation represents a key stage in the pathogenesis of prosthetic infections (PIs). More tolerant to antibiotics than their planktonic counterparts, biofilm bacteria are difficult to eradicate using conventional therapeutic regimes. A common approach in PI management is the adjunctive use of localised antibiotics in addition to systemic administration in an attempt to protect the implant from colonisation by infiltrating bacteria. This study evaluates the antibacterial and antibiofilm efficacy of antibiotic-loaded dissolvable calcium sulphate, previously shown to be effective against key gram-positive pathogens, against gram-negative species important in the establishment of chronic infection in PIs...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27909745/dechlorination-of-three-tetrachlorobenzene-isomers-by-contaminated-harbor-sludge-derived-enrichment-cultures-follows-thermodynamically-favorable-reactions
#4
Yue Lu, Javier Ramiro-Garcia, Pieter Vandermeeren, Steffi Herrmann, Danuta Cichocka, Dirk Springael, Siavash Atashgahi, Hauke Smidt
Dechlorination patterns of three tetrachlorobenzene isomers, 1,2,3,4-, 1,2,3,5-, and 1,2,4,5-TeCB, were studied in anoxic microcosms derived from contaminated harbor sludge. The removal of doubly, singly, and un-flanked chlorine atoms was noted in 1,2,3,4- and 1,2,3,5-TeCB fed microcosms, whereas only singly flanked chlorine was removed in 1,2,4,5-TeCB microcosms. The thermodynamically more favorable reactions were selectively followed by the enriched cultures with di- and/or mono-chlorobenzene as the main end products of the reductive dechlorination of all three isomers...
December 1, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27909309/hydrogen-sulfide-h2s-emission-control-by-aerobic-sulfate-reduction-in-landfill
#5
Yuyang Long, Yuan Fang, Dongsheng Shen, Huajun Feng, Ting Chen
H2S emissions from landfill sites resulting from sulfate reduction has become a serious human health and ecological safety issue. This study investigated H2S emission behavior and sulfate metabolism occurring in simulated landfills under different operating conditions. Under aerobic conditions, great attenuation of the original sulfate content (from around 6000 mg kg(-1) dropped to below 800 mg kg(-1)) with corresponding accumulation of sulfides and elemental sulfur were observed, indicating that sulfate reduction processes were intense under such conditions...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27898775/sodium-tetraborate-decahydrate-treatment-reduces-hydrogen-sulfide-and-the-sulfate-reducing-bacteria-population-of-swine-manure
#6
Melvin T Yokoyama, Cheryl Spence, Susan M Hengemuehle, Terence R Whitehead, Robert von Bernuth, Michael Cotta
Emission of odorous and toxic gases from stored livestock manure is well documented and poses a serious health risk to farmers and livestock. Hydrogen sulfide emissions have been sharply rising with increasingly intensive livestock production and are of particular concern because of the acute toxicity of this gas. Numerous strategies, technologies, and chemical treatments have been used to control hydrogen sulfide emissions, but none have worked particularly well because they are neither cost-effective nor environmentally sustainable, or they are too toxic for animals...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27893284/biomarkers-and-metabolic-patterns-in-the-sediments-of-evolving-glacial-lakes-as-a-proxy-for-planetary-lake-exploration
#7
Víctor Parro, Yolanda Blanco, Fernando Puente-Sánchez, Luis A Rivas, Mercedes Moreno-Paz, Alex Echeverría, Guillermo Chong-Díaz, Cecilia Demergasso, Nathalie A Cabrol
Oligotrophic glacial lakes in the Andes Mountains serve as models to study the effects of climate change on natural biological systems. The persistent high UV regime and evolution of the lake biota due to deglaciation make Andean lake ecosystems potential analogues in the search for life on other planetary bodies. Our objective was to identify microbial biomarkers and metabolic patterns that represent time points in the evolutionary history of Andean glacial lakes, as these may be used in long-term studies as microscale indicators of climate change processes...
November 28, 2016: Astrobiology
https://www.readbyqxmd.com/read/27884109/cloning-functional-expression-and-characterization-of-a-bifunctional-3-hydroxybutanal-dehydrogenase-reductase-involved-in-acetone-metabolism-by-desulfococcus-biacutus
#8
Jasmin Frey, Hendrik Rusche, Bernhard Schink, David Schleheck
BACKGROUND: The strictly anaerobic, sulfate-reducing bacterium Desulfococcus biacutus can utilize acetone as sole carbon and energy source for growth. Whereas in aerobic and nitrate-reducing bacteria acetone is activated by carboxylation with CO2 to acetoacetate, D. biacutus involves CO as a cosubstrate for acetone activation through a different, so far unknown pathway. Proteomic studies indicated that, among others, a predicted medium-chain dehydrogenase/reductase (MDR) superfamily, zinc-dependent alcohol dehydrogenase (locus tag DebiaDRAFT_04514) is specifically and highly produced during growth with acetone...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27877167/polycyclic-aromatic-hydrocarbon-induced-changes-in-bacterial-community-structure-under-anoxic-nitrate-reducing-conditions
#9
Sophie-Marie Martirani-Von Abercron, Daniel Pacheco, Patricia Benito-Santano, Patricia Marín, Silvia Marqués
Although bacterial anaerobic degradation of mono-aromatic compounds has been characterized in depth, the degradation of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene has only started to be understood in sulfate reducing bacteria, and little is known about the anaerobic degradation of PAHs in nitrate reducing bacteria. Starting from a series of environments which had suffered different degrees of hydrocarbon pollution, we used most probable number (MPN) enumeration to detect and quantify the presence of bacterial communities able to degrade several PAHs using nitrate as electron acceptor...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27875932/hybrid-soliwave-technique-for-mitigating-sulfate-reducing-bacteria-in-controlling-biocorrosion-a-case-study-on-crude-oil-sample
#10
Muhammad Khairool Fahmy Bin Mohd Ali, Akrima Abu Bakar, Norhazilan Md Noor, Nordin Yahaya, Mardhiah Ismail, Ahmad Safuan Rashid
Corrosion is one of the leading causes of failure in onshore and offshore transmission pipelines, threatening pipeline integrity internally and externally. Microbiologically Influenced Corrosion (MIC) is among the common corrosion types for buried and deep-water pipelines that result in costly repair and pipeline failure. Sulfate Reducing Bacteria (SRB) are commonly known as the culprit of MIC. Many countries have very stringent regulations for the usage of chemical substances (biocides) to inhibit microorganism growth...
November 23, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27873195/community-structure-of-a-sulfate-reducing-consortium-in-lead-contaminated-wastewater-treatment-process
#11
Yen T Nguyen, Hoa T Q Kieu, Stephanie West, Yen T Dang, Harald Horn
This study evaluated the capacity to remove lead by an indigenous consortium of five sulfate-reducing bacteria (SRB): Desulfobacterium autotrophicum, Desulfomicrobium salsugmis, Desulfomicrobium escambiense, Desulfovibrio vulgaris, and Desulfovibrio carbinolicus, using continuous moving bed biofilm reactor systems. Four continuous moving bed biofilm reactors (referred as R1-R4) were run in parallel for 40 days at lead loading rates of 0, 20, 30 and 40 mg l(-1) day(-1), respectively. The impact of lead on community structure of the SRB consortium was investigated by dsrB gene-based denaturing gradient gel electrophoresis (dsrB-based DGGE), fluorescence in situ hybridization (FISH) and chemical analysis...
January 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/27871998/isolation-of-a-sulfide-producing-bacterial-consortium-from-cooling-tower-water-evaluation-of-corrosive-effects-on-galvanized-steel
#12
Esra Ilhan-Sungur, Derya Ozuolmez, Ayşın Çotuk, Nurhan Cansever, Gerard Muyzer
Sulfidogenic Clostridia and sulfate reducing bacteria (SRB) often cohabit in nature. The presence of these microorganisms can cause microbially influenced corrosion (MIC) of materials in different ways. To investigate this aspect, bacteria were isolated from cooling tower water and used in corrosion tests of galvanized steel. The identity of the isolates was determined by comparative sequence analysis of PCR-amplified 16S rDNA gene fragments, separated by denaturing gradient gel electrophoresis (DGGE). This analysis showed that, in spite of the isolation process, colonies were not pure and consisted of a mixture of bacteria affiliated with Desulfosporosinus meridiei and Clostridium sp...
November 18, 2016: Anaerobe
https://www.readbyqxmd.com/read/27869680/gut-bacteria-and-hydrogen-sulfide-the-new-old-players-in-circulatory-system-homeostasis
#13
REVIEW
Lenka Tomasova, Piotr Konopelski, Marcin Ufnal
Accumulating evidence suggests that gut bacteria play a role in homeostasis of the circulatory system in mammals. First, gut bacteria may affect the nervous control of the circulatory system via the sensory fibres of the enteric nervous system. Second, gut bacteria-derived metabolites may cross the gut-blood barrier and target blood vessels, the heart and other organs involved in the regulation of the circulatory system. A number of studies have shown that hydrogen sulfide (H₂S) is an important biological mediator in the circulatory system...
November 17, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27852149/remediation-of-acid-mine-drainage-using-microbial-fuel-cell-based-on-sludge-anaerobic-fermentation
#14
Xiang Peng, Tianle Tang, Xiaoqiao Zhu, Gaohui Jia, Yanran Ding, Yawen Chen, Yang Yang, Wenhao Tang
The aim of this work is to utilize the microbial fuel cell for removing metals and sulfate from acid mine drainage using sewage sludge organics and simultaneous electricity generation. The enriched sulfate-reducing mixed culture was used as the cathodic biofilm and the sludge as the substrate. Under anaerobic conditions, 71.2% sulfate, 99.7% heavy metals, and 51.6% total chemical oxygen demand are removed at an electrode spacing of 4 cm and a sludge concentration of 30% (v/v) after 10-day treatment. A maximum power density of 51...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27846794/genome-and-catabolic-subproteomes-of-the-marine-nutritionally-versatile-sulfate-reducing-bacterium-desulfococcus-multivorans-dsm-2059
#15
Marvin Dörries, Lars Wöhlbrand, Michael Kube, Richard Reinhardt, Ralf Rabus
BACKGROUND: Sulfate-reducing bacteria (SRB) are key players of the carbon- and sulfur-cycles in the sediments of the world's oceans. Habitat relevant SRBs are often members of the Desulfosarcina-Desulfococcus clade belonging to the deltaproteobacterial family of Desulfobacteraceae. Despite this environmental recognition, their molecular (genome-based) physiology and their potential to contribute to organic carbon mineralization as well as to adapt to changing environmental conditions have been scarcely investigated...
November 15, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27845198/hyaluronan-35kda-treatment-protects-mice-from-citrobacter-rodentium-infection-and-induces-epithelial-tight-junction-protein-zo-1-in-vivo
#16
Yeojung Kim, Sean P Kessler, Dana R Obery, Craig R Homer, Christine McDonald, Carol A de la Motte
Maintaining a healthy intestinal barrier, the primary physical barrier between intestinal microbiota and the underlying lamina propria, is critical for optimal health. Epithelial integrity is essential for the prevention of the entrance of luminal contents, such as bacteria and their products, through the large intestinal barrier. In this study, we investigated the protective functions of biosynthetic, specific sized, hyaluronan around 35kDa (HA35) on intestinal epithelium in healthy mice, as well as mice infected Citrobacter rodentium, an established model that mimics infection with a serious human pathogen, enteropathogenic E...
November 11, 2016: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/27845068/combination-of-metformin-and-vsl-3-additively-suppresses-western-style-diet-induced-colon-cancer-in-mice
#17
Eun-Ju Chung, Eun-Ju Do, Sang-Yeob Kim, Eun A Cho, Dong-Hee Kim, Sehyung Pak, Sung Wook Hwang, Hyo Jeong Lee, Jeong-Sik Byeon, Byong Duk Ye, Dong Hoon Yang, Sang Hyoung Park, Suk-Kyun Yang, Jin-Ho Kim, Seung-Jae Myung
Western-style diet (WD) and dysbiosis are known to be associated with colonic inflammation, which contributes to carcinogenesis. Metformin (Met) exerts anti-inflammatory effects to induce AMP-activated protein kinase (AMPK), resulting in suppressed protein synthesis and reduced cell proliferation. Probiotic VSL#3 (V) modifies microbial composition. We investigated the chemopreventive mechanisms of Met and V in WD-induced colitis-associated colon carcinogenesis. Male BALB/c mice were randomly divided into five groups: a control diet (CD) group, WD group, WD+ Met (250mg/kg/day) group, WD+V (1...
November 12, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27843439/biosurfactants-promising-molecules-for-petroleum-biotechnology-advances
#18
REVIEW
Darne G De Almeida, Rita de Cássia F Soares Da Silva, Juliana M Luna, Raquel D Rufino, Valdemir A Santos, Ibrahim M Banat, Leonie A Sarubbo
The growing global demand for sustainable technologies that improves the efficiency of petrochemical processes in the oil industry has driven advances in petroleum biotechnology in recent years. Petroleum industry uses substantial amounts of petrochemical-based synthetic surfactants in its activities as mobilizing agents to increase the availability or recovery of hydrocarbons as well as many other applications related to extraction, treatment, cleaning, and transportation. However, biosurfactants have several potential applications for use across the oil processing chain and in the formulations of petrochemical products such as emulsifying/demulsifying agents, anticorrosive, biocides for sulfate-reducing bacteria, fuel formulation, extraction of bitumen from tar sands, and many other innovative applications...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27832908/enhanced-biological-stabilization-of-heavy-metals-in-sediment-using-immobilized-sulfate-reducing-bacteria-beads-with-inner-cohesive-nutrient
#19
Xin Li, Lihua Dai, Chang Zhang, Guangming Zeng, Yunguo Liu, Chen Zhou, Weihua Xu, Youe Wu, Xinquan Tang, Wei Liu, Shiming Lan
A series of experiments were conducted for treating heavy metals contaminated sediments sampled from Xiangjiang River, which combined polyvinyl alcohol (PVA) and immobilized sulfate reducing bacteria (SRB) into beads. The sodium lactate was served as the inner cohesive nutrient. Coupling the activity of the SRB with PVA, along with the porous structure and huge specific surface area, provided a convenient channel for the transmission of matter and protected the cells against the toxicity of metals. This paper systematically investigated the stability of Cu, Zn, Pb and Cd and its mechanisms...
October 29, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27822618/enrichment-of-cryoconite-hole-anaerobes-implications-for-the-subglacial-microbiome
#20
Marek K Zdanowski, Albert Bogdanowicz, Jan Gawor, Robert Gromadka, Dorota Wolicka, Jakub Grzesiak
Glaciers have recently been recognized as ecosystems comprised of several distinct habitats: a sunlit and oxygenated glacial surface, glacial ice, and a dark, mostly anoxic glacial bed. Surface meltwaters annually flood the subglacial sediments by means of drainage channels. Glacial surfaces host aquatic microhabitats called cryoconite holes, regarded as "hot spots" of microbial abundance and activity, largely contributing to the meltwaters' bacterial diversity. This study presents an investigation of cryoconite hole anaerobes and discusses their possible impact on subglacial microbial communities, combining 16S rRNA gene fragment amplicon sequencing and the traditional enrichment culture technique...
November 7, 2016: Microbial Ecology
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