758 



RADIATION BIOLOGY 



riiotoreactions, of porphyrins, 118 



reversible, 542 

 Photoreceptor, 526, 540 

 Photoreduction, by adapted algae, 318, 

 323 

 by bacteria (see Chromatium, photo- 

 synthesis by; Purple sulfur bac- 

 teria, photosynthesis by) 

 Photorequirement, definition, 520 

 Photosensibilization, 521 

 Photosensitivity, 523-524 

 associated with porphyria, 710, 716 

 caused by, aberrant pigment synthesis, 

 707 

 Agave lechuguilla, 713 

 algae (Microcystis species), 714 

 Brassica rapa, 709, 715 

 chlorophyll derivatives, 702 

 contact with dyes, 715 

 Erodiutn species, 709, 715 

 Holocalijx glaziovii, 712 

 Hypericum species, 708 

 Kochia scoparia, 714 

 Lantana camara, 714 

 Lippia rehmanni, 711, 714 

 Lupinus angustifolius, 714 

 Medicago species, 715 

 mixed pasture, 714 

 Myoporum laetuni, 714 

 Nolina texana, 713 

 Panicum species, 705, 712, 713 

 phenanthridinium injection, 714 

 phenothiazine, 709, 716 

 Polygonum species, 708 

 sulfanilamide, 716 

 Tetradyynia species, 713 

 Tribulus terresiris, 710, 714 

 Trifolium species, 709, 715 

 congenital, in Southdown sheep, 711 

 following medication, 715 

 hepatogenous, 708 

 influence on, of afterripening, 534-535 



of drying, 531 

 porphyrins in, 710, 716 

 primary, 707 

 Photosensitivity diseases, action spectra, 

 695, 705, 709 

 classification, 707 

 investigation of, 704 

 of uncertain etiology, 714 

 Photosensitization, 18, 296 

 in diabatic processes, 36 

 syndrome of, 706 

 Photosensitizing agents, nature of, 701 

 Photosensory structures, types, 624 

 Photosynthesis, 20, 59, 267, 293-295, 333 

 action spectra, 359-364, 384-388, 450- 

 457 



Photosynthesis, biological factors, 274 

 reactions, 260 

 bright light, 278 

 calorimetric determination, 267 

 carbon dioxide acceptors, 316-320, 324, 



328, 329 

 critical survey, 282 

 cyanide inhibition, 314, 326 

 dark reactions, 296, 297, 299, 316, 323 

 dark system reactivation in light, 327 

 energy efficiency, 263, 276 

 agricultural, 277, 278 

 storage, 278 

 energy transfer, 296, 303, 307-314, 316, 



324, 330-334, 341 

 flashing-light experiments, 323, 324, 



331 

 and fluorescence (see Fluorescence) 

 higher plant, 279 

 hydrogen acceptors, 310, 321, 325 

 hydrogen donors, 297-299, 312, 320- 



322, 333, 334 

 induction phenomena, 331, 341 

 influence on respiration, 320, 340 

 intermediate products, 316-320 

 isotopic oxygen, 274 

 land plants, 275 

 limiting factors, 294, 297 

 carbon dioxide, 312 

 hydrogen donor, 312 

 light intensity, 312 

 manometric methods, 265-269 

 optimum yields, 277 

 and phosphate metabolism, 295, 299, 



328-330, 334, 341 

 products, 293, 295 

 quantum yield, 297, 330, 331 

 reaction complexes, 299, 310-315, 321, 



322, 334 

 and redox potentials, 299, 321, 324- 



328, 334 

 stirred suspension of algae, 274 

 symposium on, 280 

 thermal reactions, 260 

 time lags, 283-285 

 Photosynthetic bacteria (see Bacteria; 

 Green sulfur bacteria; Purple sulfur 

 bacteria) 

 Photosynthetic pigments (see Pigments) 

 Photosynthin, 398 

 Phototaxis (see Spectra) 

 Phototropism, 294 



negative and positive, 463 

 Phronima, compound eyes, 655 

 Phycobilins, 306, 308, 310, 356-358, 362, 



364-370 

 Phycocyanin, 303, 304, 309 

 (See also Phycobilins) 



