1252 



RADIATION BIOLOGY 



Ova, 1117, 1118 

 developing, 930 

 primitive, 1117 

 Ovarian tumors, 999, 1151, 1153, 1168- 



1171 

 Ovaries, 1117, 1136 



daily irradiation of, 1118 

 follicular cells of, 1117 

 interstitial cells of, 1117, 1118 

 plutonium and, 1118 

 radiation effects, 994, 998-999 

 radium and, 1118 

 sterility, 1117 

 "Overlapping" in genetic death, 430 

 Oviduct, 1118 

 Ovocytes, 1117 

 Ovulation, 1118 



Oxidants in physiological effects of radia- 

 tion, 921 

 Oxidation and mutations, 417 

 Oxidation-reduction, 256 

 Oxidation-reduction potentials, 307 

 Oxidation-reduction systems, 286, 289 

 Oxygen, 417 



atmospheric, 307 

 dissolved, 284, 286 



effect of, on blood-forming tissue, 1065, 

 1067 

 on radiation-induced chromosome 



aberrations, 736, 744jf. 

 on radiosensitivity, 927, 939-941 

 influence of, on high-energy muta- 

 gensis, 552, 555-564, 577 

 (See also Hypoxia) 

 as related, to radiation intensity, 749 



to temperature effects, 742 

 tissue utilization of, 1001 

 Oxygen concentration, influence on radia- 

 tion action, 131 

 Oxygen consumption, 962 

 Oxygen tension in mammals, 936 

 Ozone and mutation, 557, 563 



Pair production, 39, 44, 69 



cross section, 40 

 Palate, cleft, following injections of 

 cortisone, 907 

 following prenatal irradiation, 883, 

 892, 907, 909 

 Pancreas, 1128 

 Pancreatic fibrosis, 460 

 Pancytopenia, effect of spleen shielding 

 on, 1069 

 induced by gamma radiation, 1055- 

 1056 " 

 Papain, 299 



Para-aminopropiophenone, 941, 945 



Parabiosis, 926 



Paramecium, 424, 545, 564, 572, 580, 581, 



586, 587, 593, 595, 939 

 Parasites, insect, 444 

 Parasympatholytic drugs, 985 

 Parathyroid, carcinogenesis in, 1172 

 Partial body irradiation, 925 

 Pathology, 458-462 

 Penetration, 84-119 



/3 rays in thick foils, 100 

 electrons, 90 

 data on, 100 

 thick foils, 99 

 thin foils, 99 

 exponential law, 103-104 

 heavy charged particles, 87 

 light, 118 

 neutrons, 113, 114 



narrow-beam, 114 

 X rays, 102 



broad-beam, 108 

 narrow-beam, 103 

 Penicillin, 1003 

 Penicillin resistance, 303 

 Penicillium, 444, 535, 594 

 Pentaploid cells, 643 

 Pentaploidy, 357 

 Pepsin, 299 



Periosteal growth and bone, 1108 

 Permeability, vascular, 978-979 

 Peroxides, 417, 937, 939, 941 



organic, and mutation, 303, 550, 752 

 (See also Hydrogen peroxide) 

 Persistence, 426 

 Petechiae, 966 

 Peyer's patch, effect of shielding, on 



lvmphocytes, 1063 

 pH, 575 

 Phenol, 290 

 Phenotype, 396 



and gene dosage, 401 

 Phenylhydrazine, 935, 965 



stimulation of erythropoiesis by, 1064- 

 1066 

 Phenylhydrazine-induced anemia, effect 

 of X radiation on, 1064-1066 

 mechanism of recovery from, 1067, 

 1068 

 Phenylpyruvic amentia, 461 

 Phlebotomy-induced anemia (see Phenyl- 

 hydrazine-induced anemia) 

 Phosphate, inorganic, 290 

 Phosphatase, alkaline, 987 

 of intestine, 983 

 of plasma, 975 

 Phosphoglyceraldehyde dehydrogenase, 

 298, 299 



