Discussion 



291 



Not only does the addition of ammonia shift the steady state of 

 reduced pyridine nucleotide but it also has a dramatic effect upon the 

 oxidation-reduction levels of the cytochromes and upon the respiratory 



4J 



g lO 



^ 5ao5- 



u 



Effect upon the anaerobic 

 steady state 



2.4 mM Ammonia 



4 6 8 

 [NHjlmM 



Fig. 2A (Chance). (Expt. no. 175) 



— r- 



10 



rate. Tliis is illustrated in Fig. 2B which represents conditions similar 

 to those of Fig. 2A except that the cells are aerobic and respiration was 



Fig. 2B (Chance). (Expt. no. 175b, c) 



