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On April 5, 1952, biochemist Durey Peterson and microbiologist Herbert Murray at Upjohn published the first report of a breakthrough fermentation process for the microbial 11α-oxygenation of steroids (e.g. progesterone) in a single step by common molds of the order Mucorales.
The conflict with Chaim Weizmann, who held a postdoctoral position and was a friend of Perkin, over the fermentation of starch to isoamyl alcohol which was the starting material for synthetic rubber and therefore industrially relevant, led to the dismissal of Weizmann.