309 



Paramecium, 253 



Parker, K. D., 194, 228 



Pasteur effect, 62, 127 



Pautard, F. G. E., 10, 184, 189, 202, 



238, 252, 263, 264, 291, 292 

 Pennsylvania University Medical 



School, 100 

 Perm, see Fish sperm 

 Permeability 



ATP, 15, 195, 287 



ionic exchange, 56, 286 



sperm fractions, 56, 57, 286-287 



washing, effect of, 114 

 Perrin, W. S., 7 

 Perry, R. P., 113 



genital secretions, 70, 79 



intracellular, 79 



metabolic control in vivo, 73 

 Phascolosoma sperm 



ionic gradients, 56 

 Philodina 



ATPase localization, 287 



nine-plus-two pattern, 287 

 Philpott, D. E., 112 

 Phosphagen in sperm, 288-289 

 Phosphate 



inhibition of respiration, 68-69 



paradoxical role, 290 

 Phosphoenolpyruvate, 178, 221 

 Phosphorylation, 18, 59, 68, 99, 123- 



130 

 Physics, 1, 8 

 Physiology, 55, 279 

 Planar wave, see Wave, two-dimen- 

 sional 

 Plasticizing agents, 178-179, 255, 



259, 274, 282 

 Polarization microscopy, 194, 204 

 Polyphemus, 292 

 Poly torn a 



culture, 190 



flagella, 190, 246, 254, 269-273, 

 277 

 Poly torn ella, 246 



Population Council, 171 

 Portzehl, H., 252 

 Potassium 



ATPase, effect on, 77 



blood level, 64 



Donnan ratio, 56 



genital fluid levels, 57, 64, 76 



inhibition of glycolysis, 65, 73, 76, 

 77 



inhibition of motility, 57, 67 



inhibition of respiration, 66 



ionic balance in sperm, 57 



paradoxical role, 290 



restoration of sperm motility, 195 



sperm model reactivation, 258- 

 259 

 Power requirements, 173, 285 

 Pringle, J. W. S., 253, 275 

 Progression, see also Motility 



curved path, 3, 37 



extracted algal flagella, 270-271 



forward motion, 3, 5, 7, 8, 34 

 Propulsion, 1-11,285 



ATP energy, 234 



efficiency, 11 



force, 2, 1 1 



outermost peripheral fibers, 173 



theoretical estimates of speed, 8 



theory of, 1-3, 39 



velocity, 2, 1 1 

 Protoplasmic streaming, 207, 220 

 Protozoa, 137, 246 



flagella, 149, 152, 234 

 Psa m m eeh in us sperm 



motility, 9 



velocity, 3 

 Pseudopodia, 227 

 Pursley, G. R., 65 

 Pyridine nucleotides, 102, 104, 108, 



109, 114, 116, 119, 121, 289 

 Pyrophosphatase 



inorganic, 179, 185,265 

 Pyrophosphate 



chelating agent, 259 



inhibition of ATPase, 238 



