Buoyant densities of DNA from various strains of Streptococcus mutans

Abstract

The buoyant densities of eight strains of Streptococcus mutans were determined by analytical ultracentrifugation in caesium chloride. The results were as follows (in g/cm3): K-1-R(1.7044); SL-1(1.7040); E-49(1.7010); BHT(1.7009); FA-1(1.7000); Ingbritt(1.6967); NCTC-10449(1.6964); GS-5(1.6962). These data add to the mounting evidence for genetic heterogeneity in Strept. mutans. © 1972.