1336 



BIOLOGICAL EFFECTS OF RADIATION 



Ionization chambers, secondary, 73 



standard, 63, 67, 69 

 Ionization currents (X-ray), measure- 

 ment of, 71 

 Ions, distribution in ionized medium, 90; 

 influence of quality on, 94 

 recombination, 88 



K 



Kidney, irradiation of, 504; bladder, 499 

 Kinetics, chemical, 266; photochemical, 

 269 



Lambert's law, 260 

 Laws, photochemical, 259 

 Leaves, of green plants, effects of X-rays 

 on, 973 

 optical properties of, 779, 1022 

 Lethal dose, statistical treatment of, 241 

 Leucophyll, 1095, 1098 

 Light, artificial, effects on seed plants, 



867; growth, 717; structure, 720 

 Light, effects on, permeability, 739, 742; 

 root development, 733, 736, 744; use 

 of food reserves in plants, 731 

 mechanical equivalent of, 133 

 of optical spectrum, production of, 28- 

 36; electrical means, 28; optical 

 means, 31 

 Light, visible, anthocyanin and, 1110; 

 chlorophyll development and, 1093; 

 measurement of, 123-209; sensitiza- 

 tion of proteins to, 313 

 effects on, bacteria, 1127; enzymes, 

 1151; fermentation, 1068; fungi, 

 889; permeability of protoplasm, 

 628, 644; plant tissues (histo- 

 logical), 829, 831; respiration, 

 1059; seed plants, 763; seed 

 germination, 791 

 Light-growth reaction, 740 

 Light-growth responses, 1074 (see Photo- 



tropism) 

 Light intensities, effects on, chemical 

 reactions, 274; chlorophyll develop- 

 ment, 735, 745; etiolated plants, 734; 

 flowering, 752; growth and develop- 

 ment, 743; "hght-growth" reaction, 

 740; mineral nutrition, 750; miui- 

 Vol. 1 contains pp. 1 to 



mum requirements, 754; resistance 

 to drought, 754; seed plants, 727; 

 transpiration, 752; winter hardiness, 

 754 

 measurement of, 276 



Light periods, abnormal, in re photo- 

 periodism, 700 



Light sources, 171, 184, 276 



Limax, response to light, 594 



Lithophane units, 838 



Long-day and short-day plants, definition 

 of, 683 



Loranthaceae, effects of light on germina- 

 tion, 793 



Lumisterol, 329, 330 



Lungs and heart, irradiation of, 501 



Lythrum, effects of light on germination, 

 809 



M 



Maize, induced chromosomal alterations 

 in, 1297-1310 



Maps, cytological and genetic, 1182 



Matter, influence of, on radiation in- 

 tensity, 99; on radiation quality, 

 100, 104 



Matter and radiation, interaction of, 93; 

 secondary phenomena, 101 



Maxwell-Boltzmann, distribution law, 

 254 



Mean, arithmetic, computation of, 234; 

 defined, 233 



Measurements, of irradiation effects, 

 statistical treatment of, 232 



Median, defined, 233 



Mercury arc, 154, 185-187; plus filter, 166 



Mitogenetic radiation, 919-959; bacteria 

 as detectors of, 929; biological 

 materials and, 930; characteristics 

 of, 920; earlier experiments, 921; 

 mycetocrit technique in, 927; onion 

 root tips as detector of, 922; physical 

 methods in, 933; physical properties 

 of, 936; secondary radiation in, 932; 

 yeast as detectors of, 932 



Mode, defined, 233 



Molluscs, response to light, 592 



Monochromatic, irradiation of materials, 

 158; measurements, 149 



Monochromatic light, wave-length meas- 

 urement of, 8 

 676; Vol. 2, pp. 677 to 1330. 



