Abstract
The characteristics of streptomycete strain No. T-2636 producing antibiotics T-2636A, B, C, D, E, F and Mare given and Streptomyces rochei var. volubilis is proposed as the name for this new taxon. The antibiotics T-2636 A, B, C and D show antibacterial activity against Gram-positive bacteria and antibiotic T-2636 M shows antifungal activity. The production ratio of components A, B, C and D depends on cultural conditions. An esterase produced by the organism hydrolyzes the acetyl group of antibiotic T-2636 A converting it into antibiotic T-2636 C.
