128 



PIERRE H. GONSE 



200 



500^M 



C £1 



° S 

 o 



110 min. 



Fig. 19. Effect of oxygen on motility of dog spermatozoa. Cells sus- 

 pended in seminal fluid with GG, pH 7.3. Exp. J 83 and 84. Lower 2 

 curves: oxygen concentration (scale at right); the dashed line shows the 

 oxygen concentration in an air-saturated saline medium. Upper 2 curves: 

 relative ratings of motility on photoelectric counter; Q, seminal fluid, no 

 additions; # , seminal fluid with 10 mM glucose added at time 0. 



of motility which follows the sudden admission of oxygen into an 

 anaerobic medium deprived of sugar also shows the capacity of oxi- 

 dative metabolism to support full motility (Fig. 19). 



CONCLUSION 



Spermatozoa of the dog, bull, and clam, Spisula, possess full com- 

 plements of electron transferring enzymes in which the pigments are 

 of the same nature as those in the body tissues of the parent organism. 

 Concentrations of the components, when expressed in molarity in 

 the middle-piece mitochondria, are somewhat higher than in other 



