Abstract:
Antibiotics having antitumor and antibacterial activity are produced by fermentation of thermophilic actimomycetes Streptomyces refuineus var. thermotolerans, having NRRL numbers 3,143 and 3,144, in a nutrient medium containing a protein source and a carbohydrate source, at 35* C. to 55* C., extracting the fermentation broth with a solvent and isolating the active fraction.