Abstract
SUMMARY: An organism, resembling Microbacterium lacticum, was found to be stimulated by liver or yeast extract in a medium composed of glucose, amino acids, vitamins, adenine, guanine, uracil, ammonium formate, and mineral salts. These complex materials could be replaced by comparable concentrations of porphyrin-containing compounds and by extremely low concentrations of ferrichrome, coprogen, or terregens factor, which are thought to act as intracellular ‘iron transport factors’.
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