Subject Index 



317 



Penicillin, inhibition of amino acid 



incorporation by, 180 

 Pepsin, inactivation by organic 



peroxide, 288-289 

 Peroxidases, prevention of radio- 

 lesions by, 275 

 Phosphate uptake, depression by 



radiation, 80, 81, 82 

 Ploidy effect on radiosensitivity, 

 of bean roots, 272 

 of mammalian cells, 272 

 of multinucleate cells, 264- 



266 

 of Neurospora, 272 

 of Tradescantia microspores, 



271 

 of yeast, 272 

 Pneumococci, permeability to de- 

 oxyribonucleic acid and deoxyribo- 

 nuclease, 190 

 Pneumococcus- transforming 



principle, inactivation by 

 organic peroxide, 290-291 

 inactivation by X-rays, 63, 76, 

 276, 291-295 

 Polyvinylpyrrolidone, therapeutic 



effect of, 140 

 Primary sites of energy deposition, 

 associated with radiobiological 

 lesions, 255-270 

 Properdin, therapeutic activity of, 



140 

 Protection against radiation, 28-30, 



112-114, 133, 305 

 Proteins, metabolic stability of, 215- 



222 

 Protein synthesis, and nucleic acids, 

 6, 7, 14, 15, 177 

 and particulate cell constituents, 



162 

 and rate of labelling of ribo- 



nucleoprotein, 162, 164 

 and recovery, 131-132 

 and ribonuclease, 7 

 and the nucleus, 6, 13 

 and the nucleolus, 7 

 effect of metals on, 184 

 in absence of deoxyribonucleic 



acid, 194-195 

 in ascites tumour, 220-221 

 in disrupted cells, 176 

 in protoplasts, 185-195 

 inhibition by chemicals, 101, 



179-180 

 mechanism of, 161-168 



Protein synthesis 



role of nucleus in, 17 

 use of lysozyme in study of, 186 

 Protoplasts, abihty to divide, 186 

 bacteriophage multiplication in, 185 

 deoxyribonuclease on, 190-191 

 formation, and lysozyme, 185 

 induced enzyme synthesis in, 187— 



188 

 protein synthesis in, 185-193 

 removal of cell wall on, 185, 186 

 ribonuclease on, 191-192 

 Radiation syndrome, treatment of, 

 140-153 

 treatment of, by implantation of 



spleen, 141, 143 

 treatment of, by injection of bone 

 marrow, 141 

 Radiobiological lesions, and prim- 

 ary sites of energy deposition, 255- 

 270 

 Radiomimetic agents, effect on 

 nucleic acids and nucleoproteins, 

 59-69 

 Radiosensitivity of cells, with 



changing conditions, 36 

 Recovery, and cell-free extracts, 158 

 and parabiosis, 140 

 in bacterial cells, 124-125 

 in regenerating liver, 227-236 

 of deoxyribonucleic acid synthesis 

 after irradiation, 198, 203 

 Reducing agents and radiation 



damage, 108 

 Regenerating liver, radiation on 



metabolism of, 225-236 

 Repopulation of host from donor, 



144, 150, 151 

 Reproductive integrity of the cell, 



destruction of, 266-268 

 Reserve products, decrease in 



utilization of , 4, 5. 9, 20 

 Ribonuclease, effect on enzyme 

 synthesis, 189 

 -effect on protoplasts, 191-192 

 inhibition of amino acid incorpora- 

 tion by, 7, 186, 

 Ribonucleic acid, and amino acid 

 incorporation, 171, 174, 178 

 and protein synthesis, 6, 7, 17, 



166, 167 

 and stimulation of recovery, 



158-159 

 cytoplasmic, decrease in enu- 

 cleated amoebae, 9 



