L32 



THE ACTINOMYCETES, Vol. II 



Bin, 



Table 17 

 ■pigmented substances produced by actinomycetes (Kutzner and Waksman, 1959) 



Waksman and Curtis (1916). Of the two 

 neomycin-producing cultures isolated by 

 Waksman and Lechevalier in 1949, one 

 formed no spirals and thus agreed with the 

 original description of the organism; the sec- 

 ond produced some spirals of the closed type. 

 Differences were also observed in the shade 



of color of the aerial mycelium on synthetic 

 media. 



Some of the strains of S. fradiae were 

 found capable of producing certain antibi- 

 otics, notably members of the neomycin com- 

 plex, as well as the antifungal agent fradicin. 

 Several other species reported in the litera- 



