1338 



BIOLOGICAL EFFECTS OF RADIATION 



295; oxalic acid sensitized by 

 uranyl ion, 297; oxidation of ions 

 by dissolved oxygen, 296; ozone, 

 298; persulfate ion, 299 

 technique, 275 

 temperature and, 271 

 theory of, 253 

 wave-length and, 272 

 Photochemistry, 253-302 

 Photodynamic agents, effects of, on 

 irradiation of, bacteria, 1140; en- 

 zymes, 1155, 1157; organic products, 

 346, 347, 356 

 Photoelectric effect, of metals, 10 

 Photon energy, measurement of, 10 

 Photons, 1, 256; electrons and, 1-42 

 Photoperiodic aftereffect, in plants, 694 

 Photoperiodism, 677-713; discovery of, 



679 

 Photosynthesis, bacteria and, 1050; 

 chemical inhibitors and, 1034; com- 

 pensation point of, 1037; energy 

 relations of, 1045; energy transfer in, 

 1049 

 effect of, chlorophjdl content, 1035; 

 changes in illumination, 1037; 

 previous treatment of plants, 

 1036; temperature, 1034; light 

 intensity, 1032 

 efficiency of photosynthetic reaction, 



1045, 1046 

 inhibition by high light intensities, 



1033 

 in intermittent light, 1043 

 internal factors in, 1035 

 light factor in, 1015-1058 

 light intensity utilizable in, 1038 

 mechanism of, 1040 

 possibility of, in infra-red, 843 

 quanta used in, 1047 

 rates of, effect of wave-length, 1038; 

 infra-red, 1038; ultra-violet, 1039; 

 visible light, 1039 

 reactions in, mechanism of, 1040 

 wave-length limits of, 1040 

 Phototropism, 1073-1091 

 dark-growth response, 1075 

 growth substance, 1083 

 light intensity and, 1076; sensitivity, 



1081; wave-length, 1076 

 light-growth response, 1074 



Vol. 1 contains pp. 1 to 676 



Physical properties, mitogenetic radia- 

 tion, 936 

 Physiological properties, 904, 908 

 Physiological responses, in plants, to 



radium, 995 

 Pigmentation, protective action of, on 



fungi, 889, 902 

 Pigments, anthocyanin, 1109; chloro- 



plast, 1015, 1021 

 Planck's constant, 262, 280 

 Poa, effects of light on germination, 801 

 Polonium, as source of alpha particles, 561 

 Polyploidy, 1281, 1288, 1289 

 Polysomics, 1281, 1290 

 Porifera, regeneration of, 412 



effects of X-rays on reunition in, 413 

 Position effects, in chromosomes, 1196 

 Precipitin, effect of irradiation on, 367, 



375 

 Proteins, absorption of radiation by, 305, 

 307 

 coagulation of, by radiation, 318 

 denaturation, by irradiation, 310, 314 

 effect of, radiation on, 303-322; ultra- 

 violet on, 305, 310; X-rays and 

 radium on, 307, 314 

 isoelectric points, 304 

 primary and secondary light reactions, 



316 

 sensitization to visible light, 313 

 Protochlorophyll, 1096 

 Protoplasm, effects of radiation on, 625- 

 676 

 permeability of, in re radium, 634, 643; 

 X-rays, 637; ultra-violet, 633; 

 visible light, 628 

 viscosity of, 643; in re X-rays and 

 radium, 650; ultra-violet, 645; 

 visible light, 644 

 Provitamin D, 325, 326 

 Pyrheliometry, standard of, 211 



Q 



Quantum action, probability theory, 

 1312, 1313, 1316; single absorption, 

 1313; multiple al)sorptions, 1313 

 Quantum-hit theory, fungi and, 892; 



bacteria and, 1138 

 Quantum theory, 261 



of absorptions, biological aspects, 

 1311-1330 

 ; Vol. 2. pp. 677 to 1330. 



