760 



RADIATION BIOLOGY 



Product law, 464, 524, 539 

 Prorhynchus, ocellus, 629 

 Proteins, cytochrome reactions, 57 

 energy transfer in myoglobin, 56, 333 

 photodenaturation, 33 

 proton migration, 58 

 (<See also Enzymes) 

 Protochlorophyll, 304, 305 

 absorption curves, 403, 404 



comparison of seed-coat with barley- 

 leaf, 404, 405 

 absorption maxima, in crude extracts, 

 402 

 of isolated, 402 

 of "synthetic," 402 

 in tissues, 402, 403 

 absorption spectrum, 410 

 chemical nature, 399-401 

 chlorophyll precursor, 397 

 chlorophyllase action on, 401 

 content in mutants, 407 

 in dark-grown conifer seedlings, 429 

 fluorescence, 405, 406 

 formation, in dark -grown seedlings, 

 corn mutants, 407 

 time course, 406 

 genetic factors, 430, 431 

 hydrochloric acid number, 401 

 isolation, from etiolated barlev leaves, 

 399 

 from inner seed coats, 399 

 magnesium complex of phytyl, methyl 

 diester of 2-vinylpheoporphy- 

 rin-as, 399 

 optical activity, 406 

 photochemical transformation to chlo- 

 rophyll a, 407 

 action spectrum, 410, 411 

 intermittent-light effect, 416 

 light intensity, 414 

 quantitative, 408 

 rate, 414 



second-order process, 414 

 temperature effect, 407, 414, 419 

 wave-length dependence, 408 

 physical properties, 401-406 

 physiological properties", 406-417 

 phytyl in, 399, 400 

 re-formation, 416, 417 



temperature dependence, 420 

 in seedling extracts, 394, 495 

 structural formula, 400 

 synthetic path from chlorophyll a, 400 

 Protochlorophyll a, 397 

 Protochlorophyll b, 397 

 Protochlorophyll holochrome, definition, 

 398 

 photoreceptor for transformation to 

 chlorophyll holochrome, 411 



Protopheophytin, absorption curve, 405 

 absorption maxima, 405 

 from protochlorophyll, 399 

 structural formula, 400 

 Protophyllin, 397 

 Protoplasm, structure, 552 



viscosity, influence of visible light on, 

 551-557 

 aftereffects of light, 554 

 calcium-release theory, 557 

 dispersion viscosity, 552 

 localization of effect, 554 

 mechanism of influence, on dis- 

 persion viscosity, 556 

 on structural viscosity, 556 

 methods for determination, cen- 

 trifugation, 553 

 plasmolysis, 553 

 structural viscosity, 552 

 nature of, 551 

 photic equilibrium, 554 

 Protoplasmic streaming, influence of visi- 

 ble light on, 574-576 

 dependence of, on aftereffects of 

 illumination, 574 

 on change from weak to stronger 



light,. 575-576 

 on quantity of light, 574-575 

 on shock, 576 

 on wave length, 574-575 

 Protoporphyrin-9, 434 

 Protozoa, photosensitivity, 625 

 Pseudocone ommatidium, 647 

 Pseudoscorpionida, ocelli, 645 

 Fterotrachea, eye, 635, 641 

 Ptychodera, dermal photosensitivity, 662 

 Purkinje shift, as criterion of color vision, 

 665-666 

 in Drosophila, 650 

 Purple bacteria, 343, 370-388, 393 

 Purple sulfur bacteria, 298, 310 



bacteriochlorophyll fluorescence, 308, 



324, 327 

 photosvnthesis by, 298, 299, 306, 307, 

 334 

 and phosphate metabolism, 329 

 pigment systems, 301, 302 

 {See also Vhromatium) 

 Pycnogonida, oceUi, 645 

 Pyrrole chains, 95 

 Pyrroporphyrin XV, 109 

 Pyruvic acid, 318 



Q 



Quantity-of-stimulus law (product law), 



464, 524, 539 

 C^uantum, definition, 134 

 Quantum efficiency, 134, 285 



