[Spontaneous variation of Streptomyces griseus lysing staphylococci]

Spontaneous variation of Str. griseus was studied. 7 variants were isolated which go into the homologous series of the hereditary variability of apigment actinomycetes. The confidence intervals of the correlative relationship between the cultural and morphological features of the spontaneous variants and the level of their lytic activity did not over lap at p 0.95, which indicates that the difference is also significant by this feature. A possibility for a certain increase of the culture activity by selection of spontaneous variants is shown.