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Strain CT, a non-motile, mesophilic, hydrogenotrophic, methanogenic bacterium, was isolated from an anaerobic digester used for the treatment of raw cassava-peel waste in Congo. The cells were rods, 0.4-0.5 x 2-10 microm in size, and stained Gram-positive. Hydrogen and carbon dioxide were the only substrates that supported growth and methane production. Methane production, but not growth, occurred with CO2 in the presence of either 2-propanol, 2-butanol or cyclopentanol as hydrogen donors. The temperature range for growth was 25-50 degrees C, the optimum being between 37 and 42 degrees C. The optimum pH for growth was 7.2; consistent growth and methane production were not observed below pH 5.9 or above pH 8.2. The doubling time under optimal growth conditions was 7.5 h. The DNA base composition was 39.5 mol% G+C. On the basis of 16S rRNA gene sequence analysis and phenotypic characteristics, the isolate is proposed as a new species of the genus Methanobacterium, namely Methanobacterium congolense sp. nov. The type strain is strain CT (= DSM 7095T = OCM 779T).

Methanobacterium congolense sp. nov., from a methanogenic fermentation of cassava peel.