1262 



RADIATION BIOLOGY 



Tetraborohydride, 942, 945 



Tetrads, 355 



Tetraploid cells, 642, 643, 683 



Thiocyanate space, 971 



Thiol compounds, 307 



Thiol groups, 298, 304 



Thiols, 286-289, 303, 308 



Thiosulfate, 942, 945 



Thiouracil, 935, 946, 993 



Thiourea as protection, 942, 945 



Thorax abnormalities following prenatal 



irradiation, 884, 906 

 Thorotrast, 970 



Threshold dose in carcinogenesis, 1167 

 Thrombi, platelet, 977 

 Thrombocytes (see Platelets) 

 Thrombocytopenia, 966 

 Thrombosis, vascular, 967 

 Thymic cell suspensions, 935, 939, 942,960 

 Thymonucleic acid, 289 

 Thymus, 306, 1104 



effect on, of cerium-praseodymium, 

 1105 

 of external beta rays, 1105 

 of fast neutrons, 1105 

 of plutonium, 1105 

 of radioactive isotopes, 1105 

 of slow neutrons, 1105 

 of sodium 24 , 1105 

 of strontium 89 , 1105 

 of yttrium 91 , 1105 

 Hassall's bodies, 1105 

 lymphocytes, 1104 

 mast cells in, 1105 

 sensitivity of, to prenatal irradiation, 



880, 897-898, 912 

 stromal cells, 1104 

 Thyroid, 1132 



administration of, 929, 935, 937, 946 

 carcinogenesis in, 1167, 1171-1172 

 iodine 131 and, 1132 

 radiation effects, 942 

 Thyroidectomy, 935, 993 

 Time-intensity factor, 134, 1091, 1130 

 Tissue breakdown, 1000-1002 

 Tobacco mosaic virus, 510 

 Toluidine blue, 967-968 



effect on radiation-induced hemor- 

 rhage, 1046 

 Tonus of intestine, 985 

 Tooth primordia, effect of P 32 on, 899-900 

 Total-body vs. local irradiation, 1091 

 Totipotency, 868, 904 

 Toxins, bacterial, 1000, 1003 



produced by radiation, 245, 877, 890, 

 900 

 Trachea, carcinogenesis in, 1180 

 cartilage, 1000 



Tracks of high-energy particles, 77, 82, 



83, 315 

 Tradescantia, 363, 385, 386, 484-488, 490, 

 491, 493, 516-518, 522, 524, 525, 533, 

 534, 559, 561, 562, 566-568, 570-573, 

 578, 584, 774, 799, 804, 807, 814, 940, 

 941 

 chromosome number in, 631 

 microspores and chromosomes, 631, 

 632, 659, 668, 669, 675, 679 

 diploid, 683 

 haploid, 683 

 radiation-induced aberrations in chro- 

 mosomes of, 713-761 

 Transfusions, blood, 966, 967, 1006, 1081, 



1082 

 Transition effect (X rays), 111 

 Translocations, aneucentric, 367, 386 

 chromosome, 999 



in animal cells (see Chromosomes) 

 deletion-insertion type, 376 

 eucentric, 367, 369, 386 

 in mammals, 842-844, 846-850, 854 

 mutual or reciprocal, 367, 368 

 rate with dose, 480 

 and temperature, 565 

 whole-arm, 369 

 X-ray induced, 484, 487 

 Transport of small lymphocytes, 1104 

 Trauma (see Radiation injury) 

 Treatment of radiation syndrome, 1006 

 Treffertheorie (see Target theory) 

 Tricarboxylic acid cycle, 946 

 Trichophyton, 531, 535, 540. 570 

 Trigeminal ganglia, 995 

 Trillium, 689, 691, 695, 722, 799, 802 

 Triols, 291 



Triploids, 456, 643, 683 

 Triticum, 589, 798 

 Tritium, 587 



Triton, lethal effects, 924 

 Triturus, 807 

 Trypan blue, effects of, on mammalian 



embryo, 907 

 Trypsin, 299 



Tryptophane metabolism, 988 

 Tumor cells, 935, 939-940 

 Tumor induction (tumorigenesis), 922 

 latency of, 1150, 1158, 1171. 1178. 1181 

 pathogenesis of, 1174 

 by radioscopy, 1148, 1163 

 (See also Carcinogenesis; Carcinogenic 

 agents) 

 Tumors, 305 



carcinoma (see specific animals and 



sites) 

 chondrosarcoma (see Bone) 



