Abstract
A new mesophilic, irregular coccoid methanogen isolated from a river sediment is described. Hydrogen plus carbon dioxide or formate served as substrates for methanogenesis in a mineral salt medium. For growth acetate is strictly required. Elevated levels of sodium chloride were not required and were inhibitory at concentrations above 1.5% (w/v). The optimal growth temperature was at 45°C. The DNA base ratio was 48.6±1 mol% G+C. The polar lipid pattern and the polyamine content were similar to that found in several Methanoculleus species. The new isolate CB-1 was assigned as Methanoculleus oldenburgensis (DSM 6216).
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