Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"sulfate-reducing bacteria"”.
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Sulfate -Reducing Bacteria and Their Contribution to Intestinal Epithelial Disorders
… hydrogen sulfide (H2S), produced by commensal sulfate-reducing bacteria (SRB), may represent such an environmental insult, as this compound is highly toxic for aerobic organisms. Little is known about the intestinal ecology of SRB or the contributions of exogenous sulfate from diet or drinking …
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Microbial Ecology of Acanthamoeba polyphaga and Sulfate-Reducing Bacteria in Premise Plumbing
… are capable of acting as a host to pathogenic bacteria in potable water. The amoebae provide the bacteria with protection from chemical and physical means of disinfection. In this way many pathogens that would otherwise be killed in the water treatment process survive and are capable of …
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Community, structure, activity and ecophysiology of sulfate-reducing bacteria in deep tidal flat sediments
… with usable substrates. In this thesis sulfate-reducing bacteria (SRB) were shown to be highly abundant and metabolically active in down to 5 meters depth of a tidal sand flat (German Wadden Sea). The majority of the isolated and quantified SRB were members of two widely distributed …
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Expression of dsr messenger RNA by sulfate reducing bacteria with varying substrate and temperature
… the possibility of estimating the activity of sulfate reducing bacteria by measuring the number of messenger RNA (mRNA) transcripts of dsr, a critical gene in the sulfate reduction pathway, in a cell. Because conditions in aquifers can be quite different from those maintained in laboratory …
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Anaerobic biodegradation of selected organic compounds with and without inhibition of sulfate reducing bacteria
… of hydrogen as a structural substitute or as a reducing equivalent in the anaerobic biodegradation of methanol, methyl tert-butyl ether (MTBE), toluene, phenol, and 2,4- dichlorophenol. In addition, biodegradation rates of these compounds at various initial concentrations with and without …
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Determination of the rate of sulfide production by sulfate-reducing bacteria at the Big Five wetland
Includes bibliographical references.
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Nitrate and nitrite growth inhibition of Desulfovibrio strains
Sulfate-reducing bacteria, common non-pathogenic soil bacteria, have the ability to limit the movement of toxic heavy metals from one environmental site to another by keeping those metals from dissolving in water. Limiting the movement of heavy metals into drinking water supplies is especially …
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Effect of polysulfides on cinnabar solubility, partitioning, and methylation by Desulfovibrio desufuricans
Sulfate reducing bacteria are believed to be the most important methylators of mercury in aquatic systems. Methylation may be controlled by the availability of mercury to these bacteria and therefore may depend on mercury speciation in sulfidic water ...
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Enhanced Microbial Sulfate Removal Through a Novel Electrode-Integrated Bioreactor
In northeast Minnesota, elevated levels of sulfate in freshwater systems is a topic of great interest, due to potential adverse impacts to wild rice ecosystems. Sulfate may contribute to methylmercury production and eutrophication in certain conditions. Increased interest has emerged for developing …
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The formation of carbonate minerals in laboratory and environmental settings
Microbial sulfate reduction, couple to organic matter oxidation or methane oxidation, is one of the key processes driving the formation of sedimentary carbonate minerals. While some work has been done exploring the formation of carbonate minerals via microbial sulfate reduction, less attention has …
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On the Cellular Basis of Hydrogen Sulfide Toxicity
Hydrogen sulfide (H2S) produced by colonic sulfate-reducing bacteria represents an insult to the intestinal epithelium potentially contributing to chronic disorders that are dependent on gene-environment interactions. Clinical and epidemiologic studies reveal either persistent sulfate-reducing …
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Tracing viable bacteria in Wadden Sea sediments using phospholipid analysis
… to analyse different types of lipids from bacteria and sediments. Special emphasis was placed on the analysis of intact phospholipids by HPLC-ESI-MS/MS, because phospholipids appear to be suitable biomarkers to trace viable bacteria. The specificity of phospholipids as biomarkers was tested …
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Groundwater flow, hydrochemistry, and uranium deposition in the Powder River Basin, Wyoming
… areas where the groundwater changed from a sulfate-bicarbonate water to a bicarbonate-rich water. </p><p>The regional recharge and discharge areas of present-day groundwater-flow systems have about the same location as the recharge and discharge areas of the Tertiary groundwater-flow …
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Systems approaches to infer microbial community interactions and their impacts on ecosystem function
… understand niche competition between nitrate-reducing bacteria and sulfate-reducing bacteria in oxygen-depleted ecosystems, the importance of pathway partitioning in nitrate-reducing communities, and the role of nitrate-reducing communities in nitrous oxide emissions. I also highlight how …
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Effects of 2015 earthquake on biological stability of water in Nepal
… of water (Ammonia Oxidizing Archea and Bacteria, Nitrite Oxidizing Bacteria, Sulfate Reducing Bacteria), for example, Methylobacter, Nitrospira, Methylomonas, increased significantly right after the earthquake and decreased eight months later. This result indicated the disturbance in …
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Effect of bidens pilosa L in sulfate removal from industrial wastewater in a hydroponic system
… from human activities such as discarding sulfate-rich wastes into natural water resources leads to the introduction of sulfate and other toxic substances like heavy metals. This poses as a threat to human health and the environment since consumption of sulfate concentration greater than …
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Comparative analysis of primate hydrogenotrophic microbiota
… Methanogenesis by methanogenic Archaea and sulfate reduction by sulfate reducing bacteria (SRB) are the major hydrogenotrophic pathways in the human colon. Hydrogen metabolism by these microbes has an important impact on the colonic health. Methanogenic status of mammals is suggested to be …
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Spatial Relationship between the Trichloroethylene Degrading Bacteria Dehalococcoides Sp., Sulfate Reducers and Archaea during Reductive Dechlorination
… (organisms within the domain Archaea), sulfate reducing bacteria (SRB) and Dehalococcoides sp. (DHC) are of particular interest in this study. Three different types of bench scale reactors were constructed to model different aquifer types such as sandy, silty and fractured bedrock …
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Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia
… consistent signatures. From the lipid profiles, sulfate-reducing bacteria and anoxygenic phototrophic bacteria and archaea could be inferred. The presence of the rare 3-methylhopanoids was discovered in a significant portion of the samples, which could add to the characterization of this …
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Organic geochemical biosignatures in alkaline Hydrothermal ecosystems
… core lipids are similar to those produced by sulfate-reducing bacteria in environments where methane is oxidized anaerobically. Insoluble residues in Lost City carbonates contain proteinaceous organic material and have end-member d15N values near 0 0/00, suggesting active nitrogen fixation is …
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