THE Ml TABOI I- M OF PROTI IN 





a marked increase, becoming doubled or more; and a Bimilar resull 

 been obtained h\ placing pure amino acida in the small inte I 

 Hi grams of alanine, for example, the amino nitrogen «>f tl 

 blood rose from 3.7 to 6.3 mg. per cent.* 



In the Tissues. After entering the circulation, the ;niiiii<> acid vt 

 quickly disappear from it again. This has I n demonstrated by ob- 

 serving the amounl of amino acids in the blood after intravenously 

 injecting a solution of amino - * « - 1 « I into an anesthetized animal. After 

 injecting 12 gm. of alanine into the vein of a <h"_ r . no per cenl - in<l 





to have disappeared from the circulation within five minutes, Th< 

 tion is, What becomes of the amino acids thai rapidly disappear 



they decomposed in the blood, or <1<> they I ime absorbed by the 



suesl This problem has been attacked by analysing portions of vari 



organs and tissues removed before and some time 



into an animal <>f amino acid solutions. In the cas< muscles it 



been found thai the amino acid contenl incr< intil from 



v <» in lt. per eenl of amino acid i stimulated. Beyond tliis point. 



however, th(> muscles <1<> m to be able t.> take up any more am 



acid. The capacity <'t' the intestinal organs, hov 



*Thi- 



