Ind 



ex 



625 



Spectroscope, 483 

 Spectrum, 6 



atomic, 516-520 



characteristic, 482 



energy of various radiations, 561 



infrared, 514, 515 



molecular, 501 



electronic, 520—523 



one-electron, 516 

 Spherical aberration, 36, 65 

 Spike potential, 70, 78-83, 180 (see also 

 Action potential) 



and ACh, 443-446 



antagonistic effects of Ca ++ and K+, 442 



predicted from voltage clamp, 455—456 



quasi-static analog, 440—443 



anodal and cathodal effects, 442 

 Spin, 508 



of nucleus, 520 

 Spinal cord, 90 



central canal, 90 

 Spindle, 189-190 

 Spiral ganglion, 113 

 Standard state, 391-392 

 Standing wave, 7 

 Stapedius, 22 

 Stapes, 21-22 

 Starch, 271-272 

 Stochastic process, 465 

 Stopped-flovv method, 495, 497 

 Sr 9 », 201 

 Structure factor: 



atomic, 284 



crystal, 284 

 Substrate, 320 

 Succinic acid, 328 

 Succinic dehydrogenase, 328 

 Sucrase, 320 (see also Invertase) 

 Sucrose, 271-272, 368-369 

 Summation: 



spatial, 180 



temporal, 81, 180 

 Superior olivary complex, 115 

 Sympathetic system, 76 

 Synapse, 75, 84-87 



giant (in crayfish and squid), 85, 180 

 Synaptic conduction, 83—87 



arithmetic processes, 86 



chemical, 85, 180 



electrical, 85, 180 



Target theory, 305-307, 381 

 Taste, 52, 65 

 Tear formation, 40 

 Teleophase, 190 

 Temperature : 



sensory system, 52, 477 

 Tensor tympani, 22 

 Tetany, 142 

 Tetartanopia, 123. 128 

 Thalamus, 92 

 Thermodynamics, 383—418 



and biology, 385-400 



Thermodynamics (Cont.) 



enzyme reactions, 401-418 



laws, 386-390 



first law, 387-389 

 second law, 389 

 third law. 389-390 



muscle, 477 



role in biology, 385-386 



various functions, 390—392 

 0-waves, 98, 101 

 Thoracolumbar division, 76 

 3-phosphoglyceraldehyde, 370 

 3-phospho-glyceric acid, 368-369 

 Threonine, 275 

 Threshold : 



pure tone, 10, 14, 17 



sound pressure level, 10, 11 



speech, 17 



vision, 43-48 

 Thymine, 279 

 Thyroid, 566 

 Timbre, 5 

 Tissue culture, 263 

 Tone, 5 



pure, 5 

 Torpedo, 180 

 Touch, 5, 52, 111-113 

 TPN, 366 

 Tracer : 



radioactive, 558-563 



stable isotopes, 567-569 

 Tracer techniques, 557-570 

 Transferase, 318 

 Transisomer, 353 

 Transmittance, 489 

 Transphosphorylase, 318 

 Trichomonas foetus: 



relative fragility, 229 

 Triphosphopyridine nucleotide (TPN), 366 

 Triplet state, 522 

 Tristimulus values, 121 

 Tritanopia, 123, 128 

 Tropomyosin, 148, 152 

 Trypsin, 310 

 Tryptophan, 275 

 T-2 bacteriophage, 247 



relative fragility, 229 

 Tympanic cavity, 21 

 Tympanic duct, 24, 110-111 

 Tympanic membrane (or tympanum), 



19-24, 65 

 Tyrosine, 275 



U 



Ultramicroscope, 543 

 Ultrasonics, 213-214, 220 

 Ultrasound : 



absorption of, 213-218 

 by blood, 215 

 by liver, 216 

 by tissues, 214—217 

 cavitation : 



rate of destruction of cells, 227—228 



