1254 



RADIATION BIOLOGY 



Potential, appearance, 239, 240 

 Potential barrier, 35 

 Potential curves, 211-215, 226-227 

 Potential surfaces, 220-226 

 Poultry, 459 



(See also Chickens) 

 Precursor, embryonic, radiation effect on, 



902-904, 906, 908, 913 

 Predissociation, 218-219, 224-225, 227, 



246 

 Pregnancy, irradiation during, 932 

 and mammary gland, 1123 

 termination of, following irradiation, 



867, 870, 910, 912 

 unsuspected, and radiation-induced 



abnormalities, 910, 913 

 (See also Abnormalities ; Embryo ; Fetus) 

 Preimplantation period (of embryo), 

 irradiation during, 862, 864-868, 

 875, 886, 911-912 

 Pressure and mutation, 573 

 Primitive ova, 1117 

 Primitiveness and radiosensitivity, 930 

 Primordium damage as result of prenatal 



irradiation, 887n., 902-904, 913 

 Progynon, 576 

 Propane-l,3-dithiol, 287 

 Prophase, 628, 635, 638, 643, 648, 653, 



660, 664, 682, 688-690, 696, 928 

 Propylene glycol, 305 

 Protamine, 967-968 

 Protecting agent, 307 

 Protection, by hypoxia against radiation 

 damage to embryo, 904-905, 913 

 from radiation effects, 245, 934, 1006 

 ionizing radiations, 656 

 Protection effect, 260-262, 274 



and reactivity of solutes, 262-264 

 Protein depletion, 934 

 Protein molecule, 292 

 Proteins, 692, 695, 696 

 breakdown of, 306 

 concentration of, 293 

 degrees of reactivity, 292 

 denaturation of, 292, 293. 294, 308 

 latent period of, 294 

 by radiation, 250-252 

 hydrogen bond rupture, 292 

 of intestinal cells, 983 

 of lymph, 972-973 

 molecular weight, 292 

 of plasma, 972-973 

 prevention of enzyme inhibition, 307 

 shape, 292 



side groups, 292, 295 

 solutions, 292, 294, 295 

 spiral structure, 295 

 subunits, 195 



Proteins, synthesis of, 305 

 Prothrombin-concentration studies, 1046 

 Prothrombin time, 967 

 Protons, 3, 27 



atomic weight, 7 



charges of, 7 



ejection of, 36 



energy release in tissues, 764, 786 



range of, 87 



sources of, 10 

 Protozoa, 303, 444 

 Primus, 553 



Pseudocentrotus, 771, 772, 785, 787 

 Pulse rate, 981 

 Purine, 290 

 Purine bases, 290 

 Purine derivatives, 578 

 Purine ring, 290 

 Purpura, 966 

 Pyknosis, 1096 

 Pyrimidine ring, 290 

 Pyruvate, 305, 306 



Q 



Quality of radiation in physiological 



effects, 922 

 Quantity of radiation in physiological 



effects, 922 



R 



Rabbit, 336, 554, 629, 825, 831, 833-835, 

 837. 863, 900-901 

 bone-marrow glycolysis, 305 

 broad developmental divisions of, 863 

 carcinogenesis in, 1152, 1153, 1155, 



1164, 1174, 1183 

 irradiation of, during fetal period, 

 893-896, 898 

 during period of major organogenesis, 



868-869, 876, 879, 880, 891 

 during preimplantation period, 865- 

 866 

 LD 6 o for, 930-931 

 time of death, 932 

 Radiation, action of, 85 



influence of oxygen concentration on, 



131 

 working models, 119, 130 

 acute, effects of, 1136 



on peripheral blood, 1031-1041 

 by fast neutrons, 1041-1044 

 by X radiation, 1031-1041 

 (See also Anemia) 

 and age, 1093 

 alpha, 526, 540, 964, 970, 973, 1000 



effects of, 271, 940 

 breaking of hvdrogen bonding in pro- 

 tein by, 250-252 



