ANTAGONISTIC PROPERTIES 



TABLE 20 {continued) 



113 



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



* No activity against 5. aureus is indicated by o, moderate activity by +, high activity by ++. 



t Lysis of heat-killed E. coli is indicated by C (high activity) and c (moderate activity); lysis of 



living 5. aureus is indicated by S ; — indicates no activity. 



Actinomycetes also show antagonistic activities against fungi (12- 

 14, 844). S. albusy for example, was capable of inhibiting the growth 

 of all species of fungi tested, an effect shown to be due to the production 

 of an active substance. By the use of a culture of Colletotrichum gloe- 

 osforioidesy the antagonistic activities of 80 type cultures of actino- 

 mycetes were measured. The antagonist was allowed to grow for 5 days 

 on maltose agar, at f¥L 7.4, and the fungus was then inoculated. The 

 cultures of actinomycetes were divided, on this basis, into three groups: 

 strong, weak, and noninhibitors. The first group comprised 17.5 per 

 cent of the cultures} the second, 38.8 per cent; and the third, 43.7 per 

 cent. These results are surprisingly similar to those reported for the 

 distribution of actinomycetes possessing antibacterial properties, includ- 



