framstellning of a mixture of gentamicin and new antibiotics benemnda ji - 20 (a) and (b) ji 20 by culture of micromonospora purpurea, ji - 20

摘要

A mutant strain of Micromonospora purpurea herein designated M. purpurea JI-20 elaborates an antibiotic complex comprising gentamicin and at least two novel antibiotic substances namely Antibiotic JI-20A and Antibiotic JI-20B. The so-produced antibiotics have an adverse effect upon the growth of gram-positive and gram-negative bacteria.