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AEROBICALLY, Staphylococcus aureus has been grown [Fildes et al. 1936] on a mixture of nutrients of which only one component was unknown [Knight, 1935]. This medium would not however permit anaerobic growth. For growth anae- robically, it was necessary to add pyruvic acid and a second unknown substance (Factor III, Fildes et al. [1936]). By a process of fractionation, confirmed by synthesis, this substance is now identified as uradil.
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George Maxwell Richardson (1936) studied this question.
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