148 



D-amino acid oxidase, 33 

 Decarboxylation 



aliphatic acids, 18 

 Degradation 



nucleic acid, Z3 

 Desoxynuc lease 



molecular length related to 

 radiation response, 107 

 Desoxypentose 



site of radiosensitivity 

 moiety, 130 

 Desoxyribonucleic acid ^ 



amount of adenine-4, 6-C 

 or P phosphate incorporat- 

 ed in bone marrow, 123 

 effects of UV, 127 

 inactivation of transforming 

 principle, 7 

 ionic yield, 38 

 molecular structure, 131 

 relation of synthesis to pro- 

 tein formation, 136 

 relation to RNA, 78 

 relation to splenic involution, 

 93, 99 



role in mitosis, 69, 78 

 thymus of irradiated rats, 81 

 transforming principle in 

 pneumococcus, 6 

 turnover and number of 

 fractions, 123 

 Desoxyribonucleic acid labeled 

 precursor 



distribution in fractions of 

 NA molecules from irradiat- 

 ed rats, 121 

 Desoxyribonucleoprotein 



sea urchin sperm nuclei, 

 dispersion of. 111 

 radiosensitivity, 42 

 Dielectric absorption 



dry protein, 20 

 Diffusion theory 



radiobiological action, 25 

 Dihydrodiphosphopyridine nucleo- 

 tide (DPNH), 30, 33 

 Diphosopyridine nucleotide (DPN) 

 response to high and low 

 exposures, 43 

 Diptheria bacilli, 139 

 Direct action 



specificity, 18 

 Direct action of radiation 

 proportion to indirect 

 action, 3 

 Direct effect, 21 



Disulfide bonds 



radiation response, 35 



Dowex 50 



effect on irradiated yeast, 59 



Drosophila 



chromosome breaks in 

 salivary glands, 116 



Dry state 



maintenance of space rela- 

 tionships, 1 



Electrolytes 



effect on radiosensitivity of 

 yeast, 59 



Electrons 



low voltage effects, 20, 26 

 random walk, 1 5 

 return to positive ion, 13 

 Schmidt's theory of migration, 

 11 



transfer of excitation to vi- 

 brational energy, 18 



Endogenous respiration 

 spleen, 88, 89 

 thymus, 89 



Energy 



mechanism of migration, 19 



migration, 8, 13 



role in radiation effects, 45 



transfer, 18 



Enzymes 



differential production follow- 

 ing irradiation, 105 

 effects of irradiation, 13, 86 

 inactivation studies, 87 

 radiosensitivity of SH groups, 

 12, 31 



Escherichia coli 



beta-galactosidase, 81 

 effect of medium on radiation 

 response, 143 

 effect of radiation respira- 

 tion, 54 



effect of temperature and 

 nutrients, 57 



effect of UV on light reaction, 

 66 



protein turnover in dividing 

 and non-dividing cells, 59 

 transduction, 141 



Estrogenic hormone 



role in citric acid accumula- 

 tion in liver, 94 



Ethanol, 30, 33 



enzymatic oxidation, 33 



