[Microorganisms of the genus Nocardia and the "rhodochrous" group in the soils of the Ukrainian SSR].

Nocardioform bacteria characterized by the IV type of the cell wall and by lipid LCN-A are widely distributed in various soils of the Ukrainian SSR. The acetamidase-negative forms of Nocardia asteroides were found in 24.4% of soil samples, and the acetamidase-positive forms of this organism, in 4% of soil samples. The "rhodochrous" group was most often represented by the species N. erythropolis and N. rubropertincta, and less often, by Nocardia (Rhodococcus) rhodochrous, N. opaca and N. flava. The greatest amount of different species was detected in chernozem and dark chestnut soils of the waste zone. Chernozem soils impregnated with petroleum were particularly abundant in N. asteroides, N. rubropertincta, N. corallina and N. erythropolis. The best medium for isolation of most species was the Münz medium containing n-alkanes.