A syntrophic acetate-oxidizing bacterium, strain BS (T = type strain), was isolated from a previously described mesophilic triculture that was able to syntrophically oxidize acetate and form methane in stoichiometric amounts. Strain BS was isolated with substrates typically utilized by homoacetogenic bacteria. Strain BS was a spore-forming, gram-positive, rod-shaped organism which utilized formate, glucose, ethylene glycol, cysteine, betaine, and pyruvate. Acetate and sometimes formate were the main fermentation products. Small amounts of alanine were also produced from glucose, betaine, and cysteine. Strain BS grew optimally at 37°C and pH 7. The G+C content of the DNA of strain BS was 32 mol%. A 16S rRNA sequence analysis revealed that strain BS was a member of a new species of the genus . We propose the name for this organism; strain BS is the type strain of .


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