155 



Thymus (cont'd.) 



effects of single and frac- 

 tionated radiation on involu- 

 tion, 81 



inhibition of citric acid 

 formation, 89 



radioresistance of cell popu- 

 lation, 92 



Tissue 



susceptibility to radiation, 



102 

 Transduction phenomenon, 138, 



141 



Transforming principle, 23 



DNA, 6 



inactivation, 3, 126 



radiosensitivity, 4, 41 

 T rime thy lam ine 



ionic yield, 50 

 Trypsin 



molecular weight, 5 

 Tryplophan 



effects of irradiation, 34 

 Tryptophane oxidase 



effect of hypophysectomy, 98 

 Tyrosine 



effects of irradiation, 34 

 Tyrosine: tryptophan ratio, 34 



Tubercle bacilli 



preparation of nucleoprotein, 



117 

 Tumors 



differential cell death, 105 

 effects of oxygen differences 

 in cells on radiosensitivity, 

 69 



Ultraviolet radiation 



effects on chromosomes 

 compared with X-rays, 113 

 effects on division of muti- 

 lated cells, 77 

 effects on DNA, 127 

 effects on reaction of E. coli 

 to light, 66 

 induction of lysogeny, 137 



University of California, 4 



"Unscrewase", 134 



Uracil 



ionic yield, 38 

 reversibility of UV absorp- 

 tion, 37 



Urease, 87 



molecular weight, 5 



Van der Waals' forces, 1 12 



Virus 



direct effect of radiation, 1 

 effects of radiation on combi- 

 nation with antiserum, 21 

 incorporation in genetic mech- 

 anism of cell, 138 

 lethal effects on mice, 140 

 response to radiation, 48 

 transmission, 138 



Viscosity 



radiation induced changes in 

 DNA, 127 



Wandering agent, 15 



Water 



effects of radiations, 30 

 role in radiation response of 

 dried protein, 23 



Watson-Crick model, 131, 132, 



133, 135 



Yale University, 1, 2 



Yeast N 



alteration of Q '^ , 59, 60 



CO^ 

 effects of electrolytes on 

 radiosensitivity, 59 

 effects of radiation on fer- 

 mentation of glucose, 56 

 effects of radiation on DNA 

 and RNA, 61 



formation of giant cells, 55 

 proportion of RNA to DNA, 

 radiation response of inver- 

 tase in dry or wet state, 14 



