[Induced variability of the lipase producing fungus Rhizopus microsporus].

The most effective way for inducing mutants of Rhizopus microsporus with an elevated lipolytic activity is the combined action of nitrosomethyl urea and UV. Variants with the lipolytic activity of 3600--3700 units per 1 ml have been produced, thus being by 72--75% more effective than the parent culture.