Abstract
Phycomycetes which possess antibiotic properties are of very infrequent occurrence. When the cylinder plate method was used, Mucor racemosus exhibited antibacterial action against the Gram-positive bacterium, Sarcina lutea, and the Gram-negative bacterium, Serratia marcescens. Negative results were obtained with Escherichia coli and Staphylococcus aureus. The active antibiotic principle of the phycomycete is thermostable and is restricted to the minus strain of the heterothallic fungus for the bacteria tested.

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