Abstract
From the fermented broth of a new species of streptomyces Umezawa, Maeda and Kosaka (1) obtained a golden yellow crystalline antibiotic and called it aureothricin. This antibiotic inhibits the growth of gram-positive and negative bacteria and is clearly different from yellow antibiotics of streptomyces such as aureomycin (2) and xanthomycin (3) . In the present paper its purification and chemical characters are described.

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