626 



Ind 



ex 



Ultrasound (Cont.) 



destructive effects of, 220—232 

 diagnostic application, 262 

 generators, 223-224 

 neurosurgery by, 230—231 



Ultraviolet microbeam, 192, 262 



Ultraviolet (uv) radiation, 185, 482 



Uncertainty principle, 504 

 examples, 505 



Uracil, 279 



Valine, 275 

 Vein, 158 

 Velocity, 158 



electromagnetic waves, 206 

 group, 552 

 light, 206 

 particle, 9 

 potential, 236 

 sound, 7 

 Ventral cochlear nucleus, 115 

 Ventricle: 



of the heart, 161-163 

 Vestibular duct, 24, 110-111 

 Vibration, 5, 65 

 Virus, 246-261 



bushy stunt tomato (BSV), 247, 296 

 enteric, 263 

 influenza, 247 

 polio, 247 



studied by ultracentrifugation, 253 

 tobacco mosaic (TMV), 247, 295-296 

 Visible spectrum, 32, 482 

 Vision, 27-29, 39, 43-50, 111-113, 

 119-136, 351-359, 469-471 

 acuity, 48-50 

 binocular, 34 

 color, 32, 119-133 

 analysis, 131—133 

 antagonist theory, 123—129 

 cellular mechanisms, 124—129 

 defects, 122-123, 128 

 dichromatic, 122 

 discrimination, 119 

 monochromatic, 122 

 narrow test patches, 127—128 

 trichromatic, 122 

 tricolor theory, 123-129 

 cortical representation, 133—135 

 defects, 39, 122-123, 128 

 information theory, 469—471 

 kinetics, 128 



Vision (Cont.) 



molecular basis, 351—359 



neural aspects, 119-136 



neural measurements, 129—130 



neural sharpening in, 111—113, 131—133 



origin of neural spike, 358—359 



special uses of, 60—63 



threshold : 



luminosity, 46—48 

 quantum, 43—46 

 thresholds and acuity, 43—50 



Visual purple, 124 (see Rhodopsin) 



Vitamin A u 353-354 



Vitamin A 2 , 357 



Vitreous humor, 36, 37 



Volley theory, 115-116 



Volt, 72 



Voltage clamp, 446-449 



Voltage source, 172 



Voluntary motor pathway, 76 



W 



Wave equation, 591-592 

 Wave function, 33, 504 

 Wavelength, 6—7, 31 



electron, 552 

 Wave velocity, 591 (see also Velocity, 



sound) 

 Wedge for X ray, 574 

 Wild-type, 199 

 Work, 386 



various types, 388 



Xanthophyll, 358 

 X ray, 185 



diffraction, 280-286 



by helix, 288-289 



muscle, 152 

 X-ray analyses, 267-298 

 X-ray microscope, 550—551 

 X-ray terminology, 519 

 X-ray wavelengths, 482 



Yeast : 



damage by ultrasound, 226 



^ea mats, 362 



