Abstract
Deoxyribonucleic acid homologies were examined in 23 strains labeled Bacillus firmus, Bacillus lentus, or intermediate between these two species. With one exception (strain NRS 1560), the 11 strains assigned to B. firmus showed high homologies with the deoxyribonucleic acid of the type strain of B. firmus (ATCC 14575). However, the strains labeled B. lentus (five strains) or intermediate (seven strains) showed low homologies (approximately 5%) with the standard strains of B. firmus and with each other, except for one intermediate strain (NRS 1369), which showed high homology (98%) with one of the standard strains of B. firmus, and strains NRS 883 and NRS 1262 (both labeled B. lentus), which showed high homology (50%) with each other.
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