314 



Subject Index 



Diphosphopyridine nucleotide, 



content in anucleated cyto- 

 plasm, 9, 11,20 

 content in fasted amoebae, 4 

 distribution of, in non-nucleated 

 cytoplasm, 20 

 Direct action of radiation, and 

 chromosome breaks, 248 

 on deoxyribonucleic acid, 74^76 

 on enzymes, 25, 27, 28, 34, 38 

 on haemoglobin synthesis, 45 

 protection against, 294 

 DNA (see Deoxyribonucleic acid) 

 Dose -reduction factor, and pro- 

 tection, 121, 133, 134 

 DPN {see Diphosphopyridine nucleo- 

 tide) 

 Drosophila sperm, chromosome 



structural damage in, 117 

 Enzymes, activity of in irradiated 

 tissues, 38-56 

 and dilution effect, 25-28 

 and inactivation of amino acids, 



170, 171 

 and oxygen effect, 28, 114, 155 

 and protection effect, 28 

 direct action of radiation on, 25, 27, 



28 

 indirect action of radiation on, 25, 



27, 28 

 ionizing radiations on in vitro, 



25-34, 36-37 

 removal of nucleus on, 10-11, 18 

 respiratory effect of radiation on, 



41 

 steroid synthesizing, 46 

 Enzyme synthesis, by reticulocytes, 

 14 

 deoxyribonuclease on, 189 

 in bacteria, 58 

 induction of, in Bacillus megater- 



ium, 187-188 

 induction of, in Bacillus subtilis, 



187 

 inhibition of, 188-189 

 in non-dividing mammalian cells, 



54 

 in protoplasts, deoxyribonu- 

 clease on, 190-191 

 in protoplasts, ribonuclease on, 



191-192 

 lipase on, 188 

 radiation on, 40 

 ribonuclease on, 189 

 trypsin on, 188 



Energy transfer and deoxyribo- 

 nucleic acid aggregation, 293-294 



Extraneous agents, and energy 

 supply, 101-102 



Fatty acid synthesis, and coenzyme 

 A, 44 

 increased by radiation, 43, 45 



Ferritin synthesis, 172 



Fertilization and irradiation, 261- 

 262 



Flavoprotein, role in hydrogen trans- 

 port, 100 



Fluoracetate, toxic effects of, 102 



Fluorocitrate, as enzyme inhibitor, 

 102 



Formate incorporation in deoxy- 

 ribonucleic acid, 196-197, 210, 211 

 in ribonucleic acid, 211 



Genetic damage, modification of, 

 133, 134 



Globin synthesis, stimulation of, 45, 

 56-57 



Glucose oxidase (notatin) and oxy- 

 gen effect, 114 



Grasshopper eggs, negative growth 

 of, 108 



Grasshopper neuroblasts, action 

 spectrum of, 259 

 effect of hypertonic salt solution 



on mitosis in, 206-207, 303 

 mitotic delay in, 200 



Habrobracon radiation damage in, 

 260-261 



Haemin synthesis, stimulation of, 

 44^45, 56-57 



Haemoglobin synthesis, stimula- 

 tion of, 44, 57 



Hexokinase reaction, 93-94, 104- 

 105 



Histone, influence on radiation 

 effects, 65-66 

 reaction with nitrogen mustards, 

 67 



Hormones and cell structures, 103 



Humoral hypothesis, 141-143 



Hydrocortisone synthesis, reduced 

 by radiation, 45 



Hydrogen, effect, 295, 298-299 

 peroxide and genetic damage, 241 

 transport,"99-100 



8- Hydroxy quinoline, inhibition of 

 amino acid incorporation by, 180- 

 182 



Hypertonic salt solution, influence 

 on effects of radiation, 206-207, 273 



