REACTIVATION OF EXTRACTED SPERM CELL MODELS 



257 



STRENGTH (ju ) 

 0.20 0.30 



0.40 



IO-2 



ATP CONCENTRATION (M/l) 

 Fig. 2. Variation in frequency of insect sperm models as a function of 

 ATP concentration (A) and of ionic strength (Q). (After Hoffmann-Ber- 

 ling, 1955b, 1959). 



IO 20 



TEMPERATURE , °C 

 Fig. 3. Temperature dependence of insect flagellar models reactivated 

 with 1 mM ATP. Q 10 ~ 2. (After Hoffmann-Berling, 1955a.) 



