312 



Survival, 79, 242 



pH, effect of, 71 



value of motility, 137 

 Suzuki, T., 265 

 Syneresis 



Amoeba, 20$ 



muscle proteins, 203, 207-208, 

 214-219 



requirements, 203 



testicular extract, 203 

 Szent-Gyorgyi, A., 203, 251, 252, 253 



Tachycines 



sperm model, 253 

 Tail helix, see Fibrous sheath 

 Tatham, G., 228 

 Taylor, G. I., 18, 39, 40, 51, 53, 143, 



253, 285 

 Temperature 



coefficient, velocity, 48 



sperm model sensitivity, 256 

 Tensile elements, 8, 9, 164, 173, 



275-277, 286 

 Terner, C, 89, 134, 289 

 Tetrahymena 



acetylcholinesterase, 246 

 Thompson, G., 228 

 Tibbs, J., 77, 178, 202, 233, 261, 263, 



265, 269, 291, 293 

 Tick sperm 



motility, 27 

 Torque, 8, 16, 39 

 Torry Research Station, Aberdeen, 



190 

 Transaminase, 133-134 

 Transphosphorylation, 126, 288 

 Transport 



sperm, in vivo, 171 

 Trichonympha 



ultrastructure, 26, 149, 152 

 TN, see Turnover number 

 Turbidimetry 



technique, 100, 240-242 

 Turnover number, 100, 102, 111- 

 113, 118, 119, 121, 129, 289 



Ultrastructure, 147-168; see also in- 

 dividual components 

 macromolecular organization, 10 

 planes of orientation, 4 

 Uncoupling, 59, 289 



comparative sensitivity of sperm, 

 289 

 Uncoupling agents 



azide, 119, 121, 123, 129 

 dinitrophenol, 59, 119, 121, 126. 



129 

 metabolic control, 289 

 Undulating organisms, 9, 10 

 Undulatory movement, 7 

 Uniplanar wave, see Wave, two-di- 

 mensional 

 United States Public Health Serv- 

 ice, 89, 171 

 Uterine secretions 

 action on sperm, 63 

 pH, 71 



Vaginal secretions, 63 



pH, 71 

 VanDemark, N. L„ 62, 83 

 van Duijn, C, Jr., 14, 53 

 Van Herpen, G., 53 

 Vantienhoven, A., 135 

 van Trigt, H., 1 1 

 Varga, E., 184 

 Varga, L., 252 

 Vas deferens 



sodium-potassium ratio, 64 

 Velocity, 35, 39, 141, 252, 285 



aging of sperm, effect of, 48 



calculated speed of progression, 



3, 4, 40 



determination, 31, 32, 35, 39, 40. 



42-43, 46 

 energy expenditure, 143 

 extracted algal ffagella, 271-272 

 extracted algal flagella viscosity 



change, effect of, 272 

 observed speed of progression, 3, 



4, 13 



