abstract |
ANTIBIOTIC MIXTURE A-287, COMPRISING MICROBIOLIGICALLY ACTIVE,STRUCTURALLY RELATED FRACTORS A AND B, PRODUCED BY CULTIVATION OF ACTINOPLANES UTAHENIS NRRL 5614 UNDER SUBMERGED AEROBIC CONDITIONS, IS ISOLATED BY EXTRACTION OF THE BROTH. THE INDIVIDUAL FRACTORS ARE SEPARATED AND ISOLATED BY CHROMATOGRAPHY AND COUNTERCURRENT DISTRIBUTION. THE A-287MIXTURE AND THE INDIVIDUAL FACTORS HAVE ANTIBACTERIAL, ANTIFUNGAL, PARASITICIDAL, AND GROWTH-PROMOTING ACTIVITY. |