AMINO- ACID METABOLISM 175 



consumption accompanying indole formation must be involved 

 in the oxidation of pyruvic acid. 



The amino-acid metabolism of Esch. coli, Streptococci, and 

 two typical Clostridia is summarised in Table XV. 



FOR FURTHER READING 



" Enzymes Involved in the Primary Utilisation of Amino- 

 acids by Bacteria," Gale, E. F., Bad. Rev., 1940, 4, 135. 



" Bacterial Amino-acid Decarboxylases," Gale, E. F., 

 Advances in Enzymology, 1946, 6, 1. 



" Nitrogen Metabolism," Gale, E. F., Annual Rev. Microbiol, 

 1947, 1, 141. 



