ADAPTIVE AND CONSTITUTIVE ENZYMES 97 



use ammonium salts instead of amino-acids in their 

 synthetic processes. 



For further reading ; — 



R. J. Dubos, " The Adaptive Production of Enzymes by Bacteria." Bact. 



Bev. 4 (1940), 1. 

 E. F. Gale, " Factors Influencing the Enzymic Activities of Bacteria." 



Bact. Bev. 7 (1943). 139. 

 B. C. J. G. Knight, " Bacterial Xutrition," Medical Research Council 



Special Report No. 210. H.M. Stationery Office. London, 1936. 

 H. Karstriim, " Formation of Enzymes in Bacteria. I, II." Suomen Kern., 



2 (1929), 63; 3 (1930). 42. 



" Enzvmatische Adaptation bei Mikro-organismen." Ergehnisse fur 



Enzymforsdumg. 7 (1938), 350. 



