The deoxyribonucleic acid (DNA) relationships among strains of the thermophilic species , and , other saccharolytic, proteolytic, and acetate-producing clostridia, and some sulfate-reducing bacteria were studied by DNA-DNA hybridization experiments. Strains of the species were found to constitute a genotypically homogeneous group clearly unrelated to the strains of the species and other competitor strains used. Strains of the species showed a high level of homology with the reference strain ATCC 7956. The guanine-plus-cytosine contents of the acetate-forming clostridia and were 34.0 and 54.0 mol%, respectively.


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