Deoxyribonucleic Acid Base Composition of Dermatophilus congolensis and Geodermatophilus obscurus

Abstract
The base compositions of the DNAs extracted from 4 representative strains of D. congolensis and 6 of G. obscurus, which are described in the literature as belonging to the family Dermatophilaceae (Actinomycetales), were determined. The range of guanine plus cytosine contents (G+C) of their DNAs was 57.4-58.7 mol% for D. congolensis and 72.9-74.6 mol% for G. obscurus. This difference in DNA base composition is considered great enough to suggest a substantial genetic heterology between the 2 groups of organisms.