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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 80 for “"methanogens"”.
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Dominant substrates used by methanogens in hypersaline environments
… was to determine the dominant substrates used by methanogens in the salt ponds of Elkhorn Slough, the Don Edwards National Wildlife Refuge, and the and the Exportadora de Sal saltern. Microbial mat and/or sediments were amended with site water only or with site water and various substrates and …
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Novel Compounds From Methanogens: Characterization of Component B of the Methylreductase System and Mobile Factor
An enzymic assay for the detection and quantitation of component B based on cell-free extract of Methanobacterium thermoautotrophicum stripped of small molecular weight cofactors by anaerobic column chromatography was developed. Component B was purified to homogeneity from boiled cell extract of M. …
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Methanogens from Siberian permafrost as models for life on Mars : response to simulated martian conditions and biosignature characterization
… survival on the martian subsurface. Moreover, methanogens from Siberian permafrost are extremely resistant against different types of physiological stresses as well as simulated martian thermo-physical and subsurface conditions, making them promising model organisms for potential life on Mars. …
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Culture of Methanogens Under a Pressurized Atmosphere (Hydrogen: Carbon-Dioxide) for Study of Their Phylogeny and Coenzyme M Requirement
Made available in DSpace on 2014-12-14T07:14:49Z (GMT). No. of bitstreams: 1 8008966.pdf: 6301824 bytes, checksum: 1cb55031d00ce4ed483d6f1d99f4b76a (MD5) Previous issue date: 1979
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Expanding the genetic toolbox for methanogenic archaea and investigating ferredoxin redox circuit formation in Methanosarcina acetivorans
Methane-producing archaea (methanogens) occupy a number of anoxic niches from soil sediments to the gastrointestinal tracts of numerous animals. In these anaerobic environments methanogens have specialized in converting simple substrates like carbon dioxide (CO2), formate, and acetate to methane …
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Unexpected metabolic versatility discovered using new high-throughput genetic approaches in a model methanogen
Microorganisms known as methanogens produce most of the methane on Earth and areglobally distributed in anoxic (i.e., oxygen-free) environments such as freshwater and marine sediments, wastewater treatment facilities, and the digestive tracts of ruminants. Despite acknowledgement of their broad …
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Sulfite reductase and thioredoxin in oxidative stress responses of methanogenic archaea
Methanogens are a group of microorganisms that utilize simple compounds such as H₂ + CO₂, acetate and methanol for the production of methane, an end-product of their metabolism. These obligate anaerobes belonging to the archaeal domain inhabit diverse anoxic environments such as rice paddy fields, …
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Structural and functional analysis of anaerobic biofilm communities: An integrated molecular and modeling approach
… RNA from phylogenetically-defined groups of methanogens, were designed and characterized for use as hybridization probes for studies in environmental and determinative microbiology. Using these probes, it was determined that Methanosarcina-species, Methanobacteriales, and Methanosaeta-species …
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Identification and Characterization of the Enzymes Involved in Biosynthesis of FAD and Tetrahydromethanopterin in Methanocaldococcus jannaschii
Methanogens belong to the archaeal domain, are anaerobes and produce methane from CO2 or other simple carbon compounds. Methanogenesis is a key process of the global carbon cycle and methanogens produce about 75-85% of all methane emissions. Besides the universally occurring coenzymes that are …
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Growth and Survivability of Microorganisms at Martian Temperatures and Pressures
… space-based sources has prompted the study of methanogens as models for life on Mars. Methanogens are microorganisms within the domain Archaea, many of which utilize carbon dioxide (CO2) and hydrogen to produce methane. The non-photosynthetic nature of methanogens indicates that they could …
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Recombinant Expression and Assembly of Methyl Coenzyme-M reductase
… post-translational modifications across both methanogens and ANME. In methanogens, MCR is encoded in a conserved mcrBDCGA gene cluster, which encodes accessory proteins McrD and McrC. These are believed to be involved in the assembly and activation of MCR, respectively. However, one or both …
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Isolation and characterization of carbofuran and dicamba degrading bacteria
… reducing bacterium, one fermenter, and three methanogens. The sulfate reducing bacterium was isolated from the consortium using sulfate as a terminal electron acceptor and 2-bromoethanesulfonic acid was added to inhibit the growth of the methanogens. Since the fermenter is dependent upon the …
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Greenhouse gas metabolizing prokaryotes in peatlands
… genera known for syntrophic interactions with methanogens were found. Diversity of methanogens was lower than bacterial diversity, as only hydrogenotrophic Methanomicrobiales and Methanocellales were detected. Both process data and molecular data suggest that (i) hydrogenotrophic methanogenesis …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… cultures, and computational models explain how methanogens produce unique nonequilibrium methane clumped isotopologue (13CH3D ) signals that do not correspond to growth temperature. Instead, Δ13CH3D values may be driven by enzymatic reactions common to all methanogens, the C-H bond inherited …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… cultures, and computational models explain how methanogens produce unique nonequilibrium methane clumped isotopologue (1 3CH3D ) signals that do not correspond to growth temperature. Instead, [Delta]13CH3D values may be driven by enzymatic reactions common to all methanogens, the C-H bond …
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The Microbubble Assisted Bioremediation of Chlorinated Ethenes
… throughout the experiment, verifying that methanogens were present. Methane levels were highest in the propionate columns, showing the the methanogens there were more active. Methane levels in the microbubble columns were similar to those in the control columns. Propionate and acetate were …
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Biochemical and molecular characterization of tetrahydromethanopterin-dependent enzymes in methanogenesis
… to the analogous THF-dependent reactions in non-methanogens.
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Die ondersoek na spesifieke bakteriegroepe in die feses van geselekteerde proefpersone
… laboratory was successful. A limited number of methanogens was identified but it seems as if all the isolates belong to the genus Methanobrevibacter. No sulphate reducing bacteria were isolated from the faecal samples which confirms that methanogens and sulphate reducing bacteria compete for …
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