SIGNIFICANCE OF AMINO ACIDS FOR THE MAINTENANCE OF NITROGEN BALANCE IN THE ADULT WHITE RAT

Abstract

N balance was established in the adult [female] white rat with rations practically devoid of protein, supplemented with vit. preps. and mixtures of the 9 amino acids essential for growth, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophane and valine. Each of the amino acids essential for growth appeared to be required since omission of any one of them was followed by a negative N balance and subsequent replacement restored N equilibrium.