INDEX 



331 



Parkinson's disease, ultrasonic therapy and. 



61, 63 

 Paralysis, acoustic irradiation to, 64-65 

 Partic Irs. elementary, 73 



Pauli, exclusion principle, 72 



Pauling, on molecular diseases, 125, 157 



on alpha helix in proteins, 127, 131 

 Penetration of radiations into tissue, 1 1" 



I Set also the specific radiation) 

 Penfield, on stimulation of cerebral cortex, 



276 

 Permeability constant, of synthetic and 

 natural membranes, 21 1, 267 

 of potassium and sodium, 268 

 changes, in nerve, during action, 270-271 

 Perspective in biophysics: 

 among biological sciences, 2 

 within all knowledge of man, 315 

 Perutz, on hemoglobin, 159 



on isomorphous replacement in X-ray dif- 

 fraction, 126 

 Phlebostatic axis, 35 

 Phosphorescence, and 7r-bonding, 146 



in amino acids and proteins, 146 

 Pholot atalyzed synthesis of vitamin D 2 , 92 

 Photoelectric absorption of electromagnetic 



radiations, 105, 106 

 Photon, 76 



Photophthalamis, induced by ultraviolet. 93 

 Photopic vision, 86 



Photosensitive cells, 85 (See also Color vi- 

 sion; Pigments) 

 Photosensitized reactions, 91-92 

 Phototherapy, 92-93 

 Physii s, state of, about 1890, 67 

 Pi(7T) bonds. ^4. 75 



and phosphores< en( e in amino acids, 146 

 in photosynthesis, 92 



Piezoelectric i rystals, 51 



analogy with transdui er cells in ear, 57 



Pigments, visual, 86 90 



absorption spectrum of rhodopsin, 88 



chlorolabe and erythrolabe, 90 



Helmholtz theory ol three, in color 

 vision, 89 



Land theory of two, 89 

 Pitch of sound. r ^ I 

 Planck's constant, "1 . 80 



Plasma, blood, ion content of and osmotic 

 pressure, 38 



fluidity of, 216. 217 



proteins in, 22 1 

 Pliicker. on electrical discharges in 

 Podolskv. on muscle power, 283 



Poiseuille's law. 212 213 



and measurement of fluidity, 213, 214 



obedience of blood to, 216 

 Polarized light (See Mn roscopy) 

 Pores in living membranes, 140 



effective diameter of, in red blood cells, 

 142 

 Potential, defined as an energy, 38 



bioelectric, differences of, 38, 39 



chemical, n, 176 



(See also Electric potentials) 



Power, units of, 28 



of matter (acoustic) waves, 49 

 of muscle contraction, as heat, l'^, and 

 work, P w , 283 

 Pressure, basic definitions, 32-33 

 as a stress, 33 

 on a skin-diver, 37 

 osmotic, 35-38 

 Prisms, 78-79, 82 



Propagation of excitation along nerve, 265, 

 306 

 frequency of, 306 



redundancy, and reliability of informa- 

 tion, 306 

 velocity of, 265 

 ( See also Nerve impulse) 

 Proportional counter, 109 

 Protanope (color-blind), 90 

 Protectors against ionizing radiations, 243 

 Proteins, 125 ff 



alpha-helical structure of crystalline, 131, 



132 

 binding to cellulose and lipid, 134 

 chemical composition and structure, 128- 



129 

 cross-bonding induced by X rays, 94, 242 

 hydrogen bonding in, 1 $0 

 mechanism of synthesis of, guided by 



DNA, 151-152 

 tables of molecular weights, 128-129, 287 

 Protons, exc hange in hydrogen bond, 43 

 ionization by, 106 

 penetration of. 116 118 

 physical properties of, 10.3 

 psi — pounds per square in< h 



q — quantity ol electrii charge; distance of 

 object from lens, flux, or amount ol ma- 

 in i.il being transpoi ted a. ross an area in 

 unit tune, energ) taken in 1>\ a swcm 

 q . (Set Rates, temperature coefficient of) 

 q'. — basal metabolic heat given ofl by a 

 nonreversible process in living system, 

 281 



