Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 77, Issue 8, Pages 2803-2806Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.02266-10
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- Russian Academy of Sciences
- INTAS [99-1250]
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Processes of inorganic carbon assimilation, methanogenesis, sulfate reduction, and acetate oxidation to CO(2) occurring in samples from the East Pacific Rise at 13 degrees N were traced, using radioisotopically labeled substrates, at temperatures ranging from 65 to 100 degrees C. Molecular hydrogen stimulated lithotrophic methanogenesis and sulfate reduction but inhibited inorganic carbon assimilation. Active mineralization of acetate was observed in an organic-rich Alvinella-associated system at 80 degrees C. Members of the Thermococcales were the most numerous hyperthermophilic archaea in these samples, their density achieving 10(8) cells per cm(3), while the numbers of cultured hydrogen-utilizing thermophilic lithotrophs were several orders of magnitude lower.
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