Journal ArticleDOI
Symbiosis of methanogenic bacteria and sapropelic protozoa
TLDR
The physiological background of this endosymbiosis and its functioning in degradation processes in the anoxic environment are discussed.Abstract:
Fluorescent bacteria were demonstrated to be abundantly spread as single cells throughout the cytoplasm of the giant amoeba Pelomyxa palustris, the sapropelic ciliate Metopus striatus and six other anaerobic protozoa examined. The endosymbionts of P. palustris and M. striatus were identified as methanogenic bacteria on the basis of the presence of the deazaflavin coenzyme F420 and the pterin compound F342. Moreover individuals of P. palustris produced methane over a long period of incubation. The number of methanogenic bacteria was above 1010 cells/ml protozoal cytoplasm. Two types of methanogenic bacteria together with unidentified thick bacteria were found in P. palustris. The physiological background of this endosymbiosis and its functioning in degradation processes in the anoxic environment are discussed.read more
Citations
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Journal ArticleDOI
Phylogenetic identification and in situ detection of individual microbial cells without cultivation.
TL;DR: Phylogenetic analysis of the retrieved rRNA sequence of an uncultured microorganism reveals its closest culturable relatives and may, together with information on the physicochemical conditions of its natural habitat, facilitate more directed cultivation attempts.
Journal ArticleDOI
Energetics of syntrophic cooperation in methanogenic degradation.
TL;DR: S syntrophically fermenting bacteria synthesize ATP by substrate-level phosphorylation and reinvest part of the ATP-bound energy into reversed electron transport processes, to release the electrons at a redox level accessible by the partner bacteria and to balance their energy budget.
Book ChapterDOI
Physiological Ecology of Methanogens
TL;DR: Biological methanogenesis plays a major role in the carbon cycle on Earth and is the terminal step in carbon flow in many anaerobic habitats, including marine and freshwater sediments, marshes and swamps, flooded soils, bogs, geothermal habitats, and animal gastrointestinal tracts as discussed by the authors.
Journal ArticleDOI
Diversity and structure of the methanogenic community in anoxic rice paddy soil microcosms as examined by cultivation and direct 16S rRNA gene sequence retrieval.
TL;DR: A dual approach consisting of cultivation and molecular retrieval of partial archaeal 16S rRNA genes was carried out to characterize the diversity and structure of the methanogenic community inhabiting the anoxic bulk soil of flooded rice microcosms.
Journal ArticleDOI
Methanogens and the diversity of archaebacteria.
References
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Journal ArticleDOI
Methanogens: reevaluation of a unique biological group.
TL;DR: The present study focuses on the development and outline of a new treatment based on 16-year-old ribonucleic acid, as well as evidence in support of the new taxonomic treatment.
Journal ArticleDOI
The biology of methanogenic bacteria.
TL;DR: This article corrects the article on p. 517 in vol.
Journal ArticleDOI
Methanothrix soehngenii gen. nov. sp. nov., a new acetotrophic non-hydrogen-oxidizing methane bacterium
TL;DR: A new genus of methanogenic bacteria is described, which was isolated from a mesophilic sewage digester and is most probably the filamentous bacterium, earlier referred to asMethanobacterium soehngenii, “fat rod” or “acetate organism”.
Journal ArticleDOI
Different Ks values for hydrogen of methanogenic bacteria and sulfate reducing bacteria: An explanation for the apparent inhibition of methanogenesis by sulfate
TL;DR: Difference in substrate affinities can account for the inhibition of methanogenesis from H2 and CO2 in sulfate rich environments, where the H2 concentration is well below 5 μM.
Journal ArticleDOI
Temperature limitation of methanogenesis in aquatic sediments.
J G Zeikus,M R Winfrey +1 more
TL;DR: The rate of sediment methanogenesis was shown to vary with respect to sediment site and depth, sampling date, in situ temperature, and number of methanogens, and correlated with increased sediment temperature during seasonal change.
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