ANTAGONISTIC PROPERTIES 



111 



properties} and 138, or 57 per cent, possessed no antagonistic action at 

 all (Table 19). A somewhat similar distribution of antagonistic prop- 

 erties was observed among a group of well-identified species taken from 

 a type culture collection, embracing 161 pure strains. Only one of the 



TABLE 19. ISOLATION OF ANTAGONISTIC ACTINOMYCETES 

 FROM VARIOUS SUBSTRATES 



From Waksman, Horning, Welsch, and Woodruff (936). 



Note. The organisms in group I were the most active antagonists, those in groups II and III had more limited 



antagonistic properties, and those in group IV showed no antibacterial effects with the methods used. 



members of the genus Nocardia proved to be antagonistic j only one of 

 the Micromonospora forms was active. Most of the antagonists were 

 found among the members of the genus Streftomyces. These cultures 

 were also examined for bacteriolytic properties, living S. aureus being 

 used as the test organism. On this basis, 87 cultures (53.1 per cent) 



