SUBJECT INDEX 



587 



Penicillium chrysogenum, 410 



notatum, 395, 399, 432, 435, 439, 441, 

 446 

 Pentose nucleic acid. Beer's law, 221 

 intracellular distribution, 213, 217 

 specific ultraviolet alxsorption, 208 

 Permea})ility, effect of radiation on, 



294, 322 

 Peroxides, 336 



hydrogen, 380, 381, 412-414 

 mutagenic effects of, in fungi, 432, 



437 

 photochemical formation of, 11-12, 



28-29 

 role in radiation damage, 295, 296 

 in ultraviolet-irradiated culture me- 

 dium, 437 

 Phenotypic expression, 405 

 Phenylalanine, 218 

 Phosphorescence, 7 



Photocells (see Detectors, photoelectric) 

 Photochemical effects, catalysis of oxi- 

 dation, 65 

 odorous substances formed and 

 destroyed, 65 

 of 2537 A and 1849 A, 65 

 Photochemical process, primary, 389, 



492, 502 

 Photochemical reaction, 385, 415 

 effect of stirring on, 20 

 quantum yield, 10-11, 14, 30 

 in solutions, 14-15 

 Photochemical sensitizers (see Sensi- 

 tizers) 

 Photodecomposition, 414 

 Photodvnamic action, 37, 297, 302, 315, 



317. 318, 320, 321, 399 

 Photoionization, 15-16 

 Photometer, 225, 226 

 Photometric analysis, errors in cyto- 

 chemistry, 229-236 

 photograph}' in, 225, 226 

 quantitative, tissues, 236-243 

 technique in cytochemistry, 225-229 

 Photometry, heterochromatic, 134 



homochromatic, 134 

 Photomultiplier tubes, 225 

 Photooxidation reactions, 27-29 

 Photoreactivation, 45, 50, 345, 351, 355, 

 394, 410, 412, 417, 420, 455-486 

 action spectrum, 468-469, 474-475, 



481, 482 

 adaptive enzyme synthesis, iahibition 



by ultraviolet, 479 

 bacteria, 470-478 



action spectrum, 474-475 

 kinetics, 473-474 

 survival curves, 472 



Photoreactivation, chemical actions, 469, 

 475, 482 

 constant dose reduction principle, 459, 



471 

 bacteriophages, 457-470 

 action spectrum, 468-469 

 adsorption and, 458 

 chemical actions, 469 

 kinetics, interrupted light, 465 

 light intensity, 464 

 multiple infection, 468 

 single infection, 461-468 

 temperature, 465, 466 

 in liquid, 458 



lysogenic complexes, induction, 470 

 photoreactivable sector, 461 

 photoreactivation curve, 462 

 on plate, 458 

 survival curves, 457, 459 

 temperature coefficient, 465 

 cell-division retardation, 479, 481 

 dark reaction, 466 

 echinoderm, 481-482 



cell-division retardation, 481 

 in fungi, 441, 478-479 

 higher plants, 483 

 hit theory, 473 

 kinetics, 461-468, 473-474 

 light intensity, 464, 473 

 light reaction, 466, 473 

 model, 466 

 multicomplexes, 468 

 mutation induction, 476-478, 479 

 plant viruses, 470 

 poison theorj', 473 

 postirradiation treatment, 366 

 protozoa, 479-481 



cell-division retardation, 479 

 reduced vigor, 480 

 structure of macronucieus, 481 

 salamander larvae, 482 

 temperature, 465-466, 471 

 ultraviolet inactivation, 455-486 

 ultraviolet wave length, 479, 482 

 of viruses, 345, 351, 355 

 visible light, 304, 306 

 X-ray inactivation, 469, 470, 481 

 yeast, 479 

 Photoreactivation rate, 463 

 Photorecovery, protozoa and inverte- 

 brate eggs, 304, 306 

 Photoreversal, 397 

 Photosensitive mutagen poison, 410 

 Photosensitization, 508 

 eosin, 508 



lipstick, .508 

 sulfanilamide, 508 

 Photosphere, 95, 96 



