[Isolation of 2 thermophilic methanogenic strains belonging to the Methanobacterium family].

Two thermophilic methanogenic bacteria were respectively isolated from bovine and swine wastes. Morphologically, these two strains belong to the genus Methanobacterium, but by their nutritional properties (growth factor requirements and formate utilization as methanogenic substrate), they seem to be different from Methanobacterium thermoautotrophicum.