Nitrogen Metabolism of Certain Coliform Bacteria

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Abstract
Strains of Escherichia, Aerobader and an Escherichia-Aerobacter intermediate in a glucose medium utilized NH3-N when this was supplied as a sole source of N. When peptone also was present, periodic analyses showed no apparent utilization of the NH3-N. In peptone-glucose solution there was evidence of attack on the soluble (non-protein) N, particularly the "polypeptide" fraction. It is suggested that amino and simple peptide N might be assimilated directly and built into protoplasm without intermediate deamination.