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sulfate reducing bacteria

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https://www.readbyqxmd.com/read/29442249/the-vertical-distribution-of-prokaryotes-in-the-surface-sediment-of-jiaolong-cold-seep-at-the-northern-south-china-sea
#1
Yuzhi Wu, Jian-Wen Qiu, Pei-Yuan Qian, Yong Wang
In deep-sea cold seeps, microbial communities are shaped by geochemical components in seepage solutions. In the present study, we report the composition of microbial communities and potential metabolic activities in the surface sediment of Jiaolong cold seep at the northern South China Sea. Pyrosequencing of 16S rRNA gene amplicons revealed that a majority of the microbial inhabitants of the surface layers (0-6 cm) were sulfur oxidizer bacteria Sulfurimonas and archaeal methane consumer ANME-1, while sulfate reducer bacteria SEEP-SRB1, ANME-1 and ANME-2 dominated the bottom layers (8-14 cm)...
February 13, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29432687/hexagonal-boron-nitride-the-thinnest-insulating-barrier-to-microbial-corrosion
#2
Govinda Chilkoor, Sushma Priyanka Karanam, Shane Star, Namita Shrestha, Rajesh Kumar Sani, Venkata Krishna Kumar Upadhyayula, Debjit Ghoshal, Nikhil A Koratkar, M Meyyappan, Venkataramana Gadhamshetty
We report the use of a single layer of two-dimensional hexagonal boron nitride (SL-hBN) as the thinnest insulating barrier to microbial corrosion induced by the sulfate-reducing bacteria Desulfovibrio alaskensis G20. We used electrochemical methods to assess the corrosion resistance of SL-hBN on copper against the effects of both the planktonic and sessile forms of the sulfate-reducing bacteria. Cyclic voltammetry results show that SL-hBN-Cu is effective in suppressing corrosion effects of the planktonic cells at potentials as high as 0...
February 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29428653/performance-and-microbial-shift-during-acidification-of-a-real-pharmaceutical-wastewater-by-using-an-anaerobic-sequencing-batch-reactor-ansbr
#3
Ilda Vergili, Ugur Golebatmaz, Yasemin Kaya, Z Beril Gönder, Halil Hasar, Gulsum Yilmaz
In this study, a lab-scale anaerobic sequencing batch reactor (AnSBR) was used for the acidification of a pharmaceutical wastewater sourced from etodolac chemical synthesis tanks. The effects of the organic loading rate (OLR), and etodolac and sulfate concentrations on the acidification rate and microbial community in AnSBR were investigated at 35 °C with a hydraulic retention time (HRT) of 37 h, a pH of 5, and OLRs up to 5.2 kgCOD/m3·day. The AnSBR accomplished a 60% acidification ratio and 50-60% etodolac removal at OLRs up to 2...
February 8, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29428389/allergenicity-reduction-of-bovine-milk-%C3%AE-lactoglobulin-by-proteolytic-activity-of-lactococcus-lactis-bmc12c-and-bmc19h-isolated-from-iranian-dairy-products
#4
Rezvan Kazemi, Asghar Taheri-Kafrani, Ahmad Motahari, Reihane Kordesedehi
Nowadays health benefits of bioactive food constituents, known as probiotic microorganisms, are a growing awareness. Cow's milk is a nutritious food containing probiotic bacteria. However, milk allergenicity is one of the most common food allergies. The milk protein, β-lactoglobulin (BLG), is in about 80% of all main cases of milk allergies for children and infants. With the aim of screening proteolytic strains of lactic acid bacteria to evaluate their potential for the reduction of allergenicity of the major bovine milk proteins, we isolated new proteolytic strains of cocci lactic acid bacteria from traditional Iranian dairy products...
February 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29411481/glycoside-hydrolase-dish-from-desulfovibrio-vulgaris-degrades-the-n-acetylgalactosamine-component-of-diverse-biofilms
#5
Lei Zhu, Venkata G Poosarla, Sooyeon Song, Thammajun L Wood, Daniel S Miller, Bei Yin, Thomas K Wood
Biofilms of sulfate-reducing bacteria (SRB) produce H2 S, which contributes to corrosion. Although bacterial cells in biofilms are cemented together, they often dissolve their own biofilm to allow the cells to disperse. Using Desulfovibrio vulgaris as a model SRB, we sought polysaccharide-degrading enzymes that disperse its biofilm. Using a whole-genome approach, we identified eight enzymes as putative extracellular glycoside hydrolases including DisH (DVU2239, dispersal hexosaminidase), an enzyme that we demonstrated here, by utilizing various p-nitrooligosaccharide substrates, to be an N-acetyl-β-D-hexosaminidase...
February 6, 2018: Environmental Microbiology
https://www.readbyqxmd.com/read/29407365/p-cresyl-sulfate-decreases-peripheral-b-cells-in-mice-with-adenine-induced-renal-dysfunction
#6
Takahiro Shiba, Ikuyo Makino, Takashi Sasaki, Yuji Fukuhara, Koji Kawakami, Ikuo Kato, Toshihide Kobayashi
Infection is a major cause of mortality in chronic kidney disease (CKD) patients. Although immune dysfunction is a risk factor for infection in CKD patients, its causes are not fully elucidated. In the present study, we evaluated whether p-cresyl sulfate (pCS), an intestinal bacteria-derived uremic toxin, was involved in immune dysfunction in CKD. We used osmotic pumps to establish adenine-induced renal dysfunction mice with a chronically high blood pCS concentration. Analysis of lymphocyte subsets revealed that pCS significantly reduced peripheral B cells in renal dysfunction mice...
January 30, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29388993/emerging-investigator-series-methylmercury-speciation-and-dimethylmercury-production-in-sulfidic-solutions
#7
Charlotte R Kanzler, Peng Lian, Emma Leverich Trainer, Xiaoxuan Yang, Niranjan Govind, Jerry M Parks, Andrew M Graham
Alkylated mercury species (monomethylmercury, MeHg, and dimethylmercury, DMeHg) exhibit significant bioaccumulation, and pose significant risks to ecosystems and human health. Although decades of research have been devoted to understanding MeHg formation and degradation, little is known about the DMeHg formation in aquatic systems. Here, we combine complementary experimental and computational approaches to examine MeHg speciation and DMeHg formation in sulfidic aqueous solutions, with an emphasis on the formation and decomposition of the binuclear bis(methylmercuric(ii)) sulfide complex (CH3Hg)2S...
February 1, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29376168/mercury-methylation-in-stormwater-retention-ponds-at-different-stages-in-the-management-lifecycle
#8
R J Strickman, C P J Mitchell
Stormwater retention ponds effectively manage erosion, flooding, and pollutant loadings, but are also sources of methylmercury (MeHg), a bioaccumulative neurotoxin which is produced by anaerobic aquatic microorganisms. Stormwater retention ponds have a 10-15 year working life, after which they are dredged and reflooded. In this study, we related MeHg biogeochemistry to the different stages of the management lifecycle. In a new, a dredged, and a mature stormwater retention pond, we measured MeHg and inorganic mercury (IHg) concentrations, and the potential for MeHg formation (Kmeth), during the early summer, peak summer, and fall of 2013...
January 29, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29371401/uncoupling-proteins-1-and-2-ucp1-and-ucp2-from-arabidopsis-thaliana-are-mitochondrial-transporters-of-aspartate-glutamate-and-dicarboxylates
#9
Magnus Monné, Lucia Daddabbo, David Gagneul, Toshihiro Obata, Björn Hielscher, Luigi Palmieri, Daniela Valeria Miniero, Alisdair R Fernie, Andreas P M Weber, Ferdinando Palmieri
The Arabidopsis thaliana genome contains 58 members of the solute carrier family SLC25, also called the mitochondrial carrier family, many of which have been shown to transport specific metabolites, nucleotides and cofactors across the mitochondrial membrane. Here two Arabidopsis members of this family, AtUCP1 and AtUCP2, which were previously thought to be uncoupling proteins and hence named UCP1/PUMP1 and UCP2/PUMP2, respectively, are assigned with a novel function. They were expressed in bacteria, purified and reconstituted in phospholipid vesicles...
January 25, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29363331/enalapril-decreases-rat-plasma-concentration-of-tmao-a-gut-bacteria-derived-cardiovascular-marker
#10
Marek Konop, Marek Radkowski, Marta Grochowska, Karol Perlejewski, Emilia Samborowska, Marcin Ufnal
INTRODUCTION: Increased plasma level of trimethylamine N-oxide (TMAO), a bacterial metabolite of choline, is associated with an increased cardiovascular risk. Indoxyl sulfate, a bacterial metabolite of tryptophan, is thought to be associated with higher mortality in cardiorenal syndrome. We hypothesized that enalapril, a well-established drug reducing cardiovascular mortality, may affect the plasma level of gut bacteria-derived metabolites and gut bacteria composition. MATERIALS AND METHODS: 14-16-week-old Wistar rats were maintained either on water (controls) or water solution of enalapril for two weeks (5...
January 24, 2018: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/29355416/antimicrobial-activity-of-a-colloidal-agnp-suspension-demonstrated-in-vitro-against-monoculture-biofilms-toward-a-novel-tooth-disinfectant-for-treating-dental-caries
#11
D R Schwass, K M Lyons, R Love, G R Tompkins, C J Meledandri
A novel silver nanoparticle (AgNP) formulation was developed as a targeted application for the disinfection of carious dentine. Silver nitrate (AgNO3) was chemically reduced using sodium borohydrate (NaBH4) in the presence of sodium dodecyl sulfate (SDS) to form micelle aggregate structures containing monodisperse 6.7- to 9.2-nm stabilized AgNPs. AgNPs were characterized by measurement of electrical conductivity and dynamic light scattering, scanning electron microscopy, transmission electron microscopy, and inductively coupled plasma mass spectrometry...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29352002/intestinal-epithelial-cell-derived-lkb1-suppresses-colitogenic-microbiota
#12
Xia'nan Liu, Jinfeng Lu, Zhenshan Liu, Junjie Zhao, Hongxiang Sun, Ningbo Wu, Hongzhi Liu, Weiwei Liu, Zhuqin Hu, Guangxun Meng, Lei Shen, Aaron W Miller, Bing Su, Xiaoxia Li, Zizhen Kang
Dysregulation of the immune barrier function of the intestinal epithelium can often result in dysbiosis. In this study we report a novel role of intestinal epithelial cell (IEC) -derived liver kinase B1 (LKB1) in suppressing colitogenic microbiota. IEC-specific deletion of LKB1 (LKB1ΔIEC) resulted in an increased susceptibility to dextran sodium sulfate (DSS)-induced colitis and a definitive shift in the composition of the microbial population in the mouse intestine. Importantly, transfer of the microbiota from LKB1ΔIEC mice was sufficient to confer increased susceptibility to DSS-induced colitis in wild-type recipient mice...
January 19, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29350440/abrupt-burial-imparts-persistent-changes-to-the-bacterial-diversity-of-turbidite-associated-sediment-profiles
#13
B K Harrison, A Myrbo, B E Flood, J V Bailey
The emplacement of subaqueous gravity-driven sediment flows imposes a significant physical and geochemical impact on underlying sediment and microbial communities. Although previous studies have established lasting mineralogical and biological signatures of turbidite deposition, the response of bacteria and archaea within and beneath debris flows remains poorly constrained. Both bacterial cells associated with the underlying sediment and those attached to allochthonous material must respond to substantially altered environmental conditions and selective pressures...
January 19, 2018: Geobiology
https://www.readbyqxmd.com/read/29339722/the-deep-subsurface-sulfate-reducer-desulfotomaculum-kuznetsovii-employs-two-methanol-degrading-pathways
#14
Diana Z Sousa, Michael Visser, Antonie H van Gelder, Sjef Boeren, Mervin M Pieterse, Martijn W H Pinkse, Peter D E M Verhaert, Carsten Vogt, Steffi Franke, Steffen Kümmel, Alfons J M Stams
Methanol is generally metabolized through a pathway initiated by a cobalamine-containing methanol methyltransferase by anaerobic methylotrophs (such as methanogens and acetogens), or through oxidation to formaldehyde using a methanol dehydrogenase by aerobes. Methanol is an important substrate in deep-subsurface environments, where thermophilic sulfate-reducing bacteria of the genus Desulfotomaculum have key roles. Here, we study the methanol metabolism of Desulfotomaculum kuznetsovii strain 17T, isolated from a 3000-m deep geothermal water reservoir...
January 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29335466/deeply-sourced-formate-fuels-sulfate-reducers-but-not-methanogens-at-lost-city-hydrothermal-field
#15
Susan Q Lang, Gretchen L Früh-Green, Stefano M Bernasconi, William J Brazelton, Matthew O Schrenk, Julia M McGonigle
Hydrogen produced during water-rock serpentinization reactions can drive the synthesis of organic compounds both biotically and abiotically. We investigated abiotic carbon production and microbial metabolic pathways at the high energy but low diversity serpentinite-hosted Lost City hydrothermal field. Compound-specific 14C data demonstrates that formate is mantle-derived and abiotic in some locations and has an additional, seawater-derived component in others. Lipids produced by the dominant member of the archaeal community, the Lost City Methanosarcinales, largely lack 14C, but metagenomic evidence suggests they cannot use formate for methanogenesis...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29328062/cyanobacterial-photosynthesis-under-sulfidic-conditions-insights-from-the-isolate-leptolyngbya-sp-strain-hensonii
#16
Trinity L Hamilton, Judith M Klatt, Dirk de Beer, Jennifer L Macalady
We report the isolation of a pinnacle-forming cyanobacterium isolated from a microbial mat covering the sediment surface at Little Salt Spring-a flooded sinkhole in Florida with a perennially microoxic and sulfidic water column. The draft genome of the isolate encodes all of the enzymatic machinery necessary for both oxygenic and anoxygenic photosynthesis, as well as genes for methylating hopanoids at the C-2 position. The physiological response of the isolate to H2S is complex: (i) no induction time is necessary for anoxygenic photosynthesis; (ii) rates of anoxygenic photosynthesis are regulated by both H2S and irradiance; (iii) O2 production is inhibited by H2S concentrations as low as 1 μM and the recovery rate of oxygenic photosynthesis is dependent on irradiance; (iv) under the optimal light conditions for oxygenic photosynthesis, rates of anoxygenic photosynthesis are nearly double those of oxygenic photosynthesis...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29324779/filling-gaps-in-bacterial-amino-acid-biosynthesis-pathways-with-high-throughput-genetics
#17
Morgan N Price, Grant M Zane, Jennifer V Kuehl, Ryan A Melnyk, Judy D Wall, Adam M Deutschbauer, Adam P Arkin
For many bacteria with sequenced genomes, we do not understand how they synthesize some amino acids. This makes it challenging to reconstruct their metabolism, and has led to speculation that bacteria might be cross-feeding amino acids. We studied heterotrophic bacteria from 10 different genera that grow without added amino acids even though an automated tool predicts that the bacteria have gaps in their amino acid synthesis pathways. Across these bacteria, there were 11 gaps in their amino acid biosynthesis pathways that we could not fill using current knowledge...
January 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29324294/microbial-community-of-a-gasworks-aquifer-and-identification-of-nitrate-reducing-azoarcus-and-georgfuchsia-as-key-players-in-btex-degradation
#18
Martin Sperfeld, Charlotte Rauschenbach, Gabriele Diekert, Sandra Studenik
We analyzed a coal tar polluted aquifer of a former gasworks site in Thuringia (Germany) for the presence and function of aromatic compound-degrading bacteria (ACDB) by 16S rRNA Illumina sequencing, bamA clone library sequencing and cultivation attempts. The relative abundance of ACDB was highest close to the source of contamination. Up to 44% of total 16S rRNA sequences were affiliated to ACDB including genera such as Azoarcus, Georgfuchsia, Rhodoferax, Sulfuritalea (all Betaproteobacteria) and Pelotomaculum (Firmicutes)...
December 20, 2017: Water Research
https://www.readbyqxmd.com/read/29321692/geobacteraceae-are-important-members-of-mercury-methylating-microbial-communities-of-sediments-impacted-by-waste-water-releases
#19
Andrea G Bravo, Jakob Zopfi, Moritz Buck, Jingying Xu, Stefan Bertilsson, Jeffra K Schaefer, John Poté, Claudia Cosio
Microbial mercury (Hg) methylation in sediments can result in bioaccumulation of the neurotoxin methylmercury (MMHg) in aquatic food webs. Recently, the discovery of the gene hgcA, required for Hg methylation, revealed that the diversity of Hg methylators is much broader than previously thought. However, little is known about the identity of Hg-methylating microbial organisms and the environmental factors controlling their activity and distribution in lakes. Here, we combined high-throughput sequencing of 16S rRNA and hgcA genes with the chemical characterization of sediments impacted by a waste water treatment plant that releases significant amounts of organic matter and iron...
January 10, 2018: ISME Journal
https://www.readbyqxmd.com/read/29319417/control-of-h2s-generation-in-simultaneous-removal-of-no-and-so2-by-rotating-drum-biofilter-coupled-with-feii-edta
#20
Jun Chen, Bingbin Li, Ji Zheng, Jianmeng Chen
Simultaneous removal of SO2 and NO from flue gas can be biologically achieved by the rotating drum biofilter with FeII(EDTA) as a solvent. One issue related with this process is the generation of H2S. To control its generation, the pathways of H2S formation was investigated, and the parametric tests were conducted. The addition of FeII(EDTA) (10 mM) increased the removal efficiency of NO and SO2, while the S2- concentration decreased from 81 mM to 3.5 mM. The parametric tests showed that the high NO concentration favored the SO2 removal and significantly inhibited the H2S generation...
January 10, 2018: Environmental Technology
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