149 



Excitation 



low voltage electrons, 26 



Eye . . 



X-ray-induced inhibition ot 



-SH groups, 40 



Ferricytochrome 



ionic yield, 39 

 Ferricytochrome c, 30 

 Ferrous sulfate, 31 

 5-adenylic acid 



breakdown in spleen, 100 



Fluoroacetate 



effect on citric acid accumu- 

 lation in liver of rats post- 

 irradiation, 93 

 inhibition of citric acid in 

 vivo, 89 



Formic acid, 30 



Free radicals 



role in oxidation-reduction 



reactions, 33 



Fumarate, 87 



Galactozymase 



effect of radiation on forma- 

 tion, 55 



Gel formation 



radiation response, 35 



Giant cells 



irradiated yeast, 55 



Glucose 



fermentation by irradiated 



yeast, 56 



Glutamate, 87 



Glutathione 



effects on X-ray induced 

 inhibition of SH enzymes, 30 



Glycerophosphatase 



role in activity of phospha- 

 tase enzymes, 98 



Grasshopper 



chromosome breaks in testis, 



116 

 Growth measurement 



in a. proteus, 70 

 Guanine 



ionic yield, 38 



Half-life 



radicals in water, 4 

 Heart 



in vivo studies of enzyme 



inhibition, 87 



Heart (cont'd.) 



inhibition of citric acid 

 formation, 89 

 radioresistance of cells, 89 



Hemoglobin 



effects of irradiation, 8, 25 

 Heterocyclic rings 



disruption by irradiation, 126 

 Hexokinase, 33, 87 

 Hotchkiss' sulfonamide factor, 3 

 Hydrocortisone 



effect on cell population of 



thymus, 107 

 Hydrogen 



role in effects of radiation, 



30, 47 



Hydrogen bonds 



effects of temperature, 133 

 radiation-induced breakage 

 and reorganization, 20 

 role in molecular stability, 

 133 



Hydrogenase 



effect of radiation on forma- 

 tion, 55 



Hypophysectomy 



effect on radioresistance, 104 

 effect on tryptophane oxidase, 

 98 



Inactivation cross-section, 5 

 Inactivation volume 



dry myosin and ribonuclease, 



5 



effect of temperature, 8 



relation to molecular volume, 



7 

 Indirect effect , 21 



attempts at removal, 23 



proportion to direct effect, 3 

 Invertase 



ionic yield, 43 



radiation response in dry and 



wet states, 14 

 Ion pairs 



effect in dry molecules, 26 



Ionic yield 



catalase, 27 



in irradiated aqueous solu- 

 tions, 31 

 Ionization 



by collision, 24 



extent in irradiated aqueous 



solution, 31 



potential in energy migration, 



19 



