Studies on Polymyxin: The Production of Fermentation Liquor

Abstract

The antibiotic polymyxin occurs in the cell-free fermentation liquor of a strain of Bacillus polymyxa isolated in these laboratories. The origin, production, isolation, and biological activity of this substance have been briefly described in a previous publication (Stansly, Shepherd, and White, 1947). The present communication describes in detail a method for the routine pro