Abstract
Summary A new thermophilic, coccoid methanogen from a potato waste digester, Methanogenium thermophilicum strain Ratisbona is described. Single cells possess one flagellum and several pili. The optimum growth temperature is 58 °C and the minimum doubling time 3.4 h. Methane is formed from H 2 : CO 2 or formate. The G+C content of the DNA is 57 mol %. The new isolate is closely related to Methanogenium thermophilicum DSM 2373 and the H 2 -oxidizing methanogen of Ferguson and Mah (1983) , which we assign to Methanogenium thermophilicum as strain Los Angeles. The species description of Methanogenium thermophilicum is emended.
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