120 



PIERRE H. GONSE 



100% 



P. N. F. P. cyf. b c,.* c 



50 



s heady 



20 



.PN.FP. b .C/j.c .a .a. 



PN FP ---(a, . c . a .cu 4 



Fig. 12. Averaged results of spectroscopic records on bull sperma- 

 tozoa. Top: reduction of respiratory enzymes during steady state of lactic 

 or succinic acid oxidation; expressed in per cent of total amount of com- 

 ponent. Lower left: effect of azide on steady state in presence of succinate, 

 lactate, or lactate with DNP; expressed, as percentage increase or decrease 

 from steady-state level of reduction. Lower right: effect of antimycin A, 

 Amytal, and DNP on steady state in presence of lactate; expressed as 

 percentage increase or decrease from steady-state level of reduction. 



equivalents accumulate which lead to increasing reduction of pig- 

 ments. Above this point, on the oxygen side, oxidizing equivalents 

 are carried down and lead to oxidation of pigments. In bull sperma- 

 tozoa, with lactate as substrate, a crossover point for Amytal appears 



