1238 



RADIATION BIOLOGY 



Diarrhea, 969, 984, 1127 

 Diazomethane, 547 

 Dicumarol, 967 

 Diet and radiosensitivity, 933 

 Differentiation, 459 



as related to radiosensitivity, 927 

 and type of radiation damage to 

 embryo, 902-903 

 Digestive system, columnar epithelium 



of, 1124 

 Dilution effect, 259, 274 

 Dinitrophenol, 551, 935 

 Diphenyl, 290 



Diphosphopyridine nucleotide, 288, 289 

 Diploid, 354 



Diploid cells, 642-644, 647, 683 

 Direct action theory of radiation (see 



Target theory) 

 Direct effects of radiation (biological), 

 245-252 

 on chromosomes, 735, 753 

 Disability, average, 432 

 Disintegration, 32, 35 



different modes of, 35 

 Disordering of solids, 196 

 Dissipation of energy (see Energy dis- 

 sipation ) 

 Dissociation, 33, 213-219, 224-225, 238- 

 239, 246, 248 

 following ionization, 225, 235, 238-239 

 Dithiophosphonate, 942 

 Divided doses, 1092 

 Dog, 863 



LD 60 for, 930 

 Dominance, 402-405 



effective, 427 

 Dosage compensation, 401, 449 

 Dosage rate, effects of, 924 



on chromosome aberrations, 727 

 lethal, on cells, 810 

 mitotic, 788-793, 813 

 Dose, 120 



cumulative, 766, 770 

 divided, 1092 



effect of varying, in prenatal irradia- 

 tion, 882-887, 904-907, 913 

 and mitotic effects of ionizing radia- 

 tion, 769, 772, 782, 783 

 permissible average or total, 433, 434 

 Dose action (see Dose effect) 

 Dose effect, exponential curves, 123-125, 

 130, 131, 135, 136 

 range of validity, 125-127 

 shape of, 326 



theoretical significance, 126 

 sigmoid curves, 132, 135 

 Dose-effect relations, 123 



Dosimetry, 145 



comparison of units, 149, 150 



of internal emitters, 166-174 



of ionizing particles, 164-165 



by means of ionization in gases, 



148-150 

 of neutrons, 161-164 

 of photons, 151-154, 177 

 practical aspects of, 174-185 

 ionizing particle, 174-177 

 photons, 181-183 

 survey of dosimetric methods, 146-148 

 of very-low-energy X ray, 179-180 

 (See also Dosage rate; Dose; Radiation) 

 Drosophila, 324, 325, 333-335, 358-363, 

 373, 375, 377, 378, 380-383, 387, 389, 

 390, 392, 394-396, 399, 403, 405- 

 412, 414, 416-423, 427, 437, 438, 443, 

 447-450, 452-455, 457, 458, 460, 

 476-479, 481-486, 492-494, 497, 

 502-507, 509, 512, 513, 516, 518, 519, 

 521, 524-526, 529, 531, 532, 534, 535, 

 539, 542, 545-547, 551, 557, 561, 

 565-572, 575-578, 581-584, 589, 595, 

 600, 738-740, 746, 807, 924, 935, 936, 

 939, 1005 

 carcinogenesis in, 1190 

 crossing over, 635, 638, 642, 653, 654, 



668 

 eggs, 682, 687, 689 

 embryos, 683 

 funebris, 410 



genetic effects in, compared with 

 mammals, 825, 835, 836, 842, 844, 

 846, 847, 849, 854-856 

 melanogaster , 410, 456, 553 



chromosome number in, 631, 642 

 simulans, 410, 456, 553 

 spermatogonia, 685, 686 

 spermatozoa, 631, 632, 635, 644, 669, 



670, 673-676, 682, 686 

 stocks, 457 

 testes, 685, 686 

 Drugs, parasympatholytic, 985 

 Ducklings, radiation effects, 925 

 Duodenum, 982 

 Duplication, 353 

 Dye, 289, 292, 295 

 Dyspnea, 995 



E 



Ear cartilage, 1000 

 Echinoderms, 357, 811 

 Ectopic erythropoiesis, 963 

 Ectopic myelopoiesis, 1103, 1106 

 Edema, 971 



intestinal, 983 



lymphatic organs, 1103 



