The Independence of the Endogenous and the Exogenous Metabolism of Nitrogen

Abstract

Although thirteen individual amino acids, including all of those considered essential for growth, four amino-acid mixtures, including one that proved adequate for the maintenance of nitrogen equilibrium in the adult rat, and one complete protein mixture of high biological value (egg) were tested, no evidence was obtained that the endogenous metabolism could be depressed by such nitrogen-containing supplements. The independence of the endogenous and exogenous types of nitrogen metabolism is thus confirmed.