Abstract
Isolation of actinomycetes is an indispensable step in the screening programs of industrially useful strains as well as in the ecological study of microorganisms. During the past 10 years, the author and his co-workers have studied the selective isolation methods of soil actinomycetes. A new medium and a variety of new methods were developed for the preferential isolation of the general and particular genera of actinomycetes. In addition, some ecological factors related to the distribution of these organisms in soils were clarified.
