746 



RADIATION BIOLOGY 



Carbon dioxide, influence of, on fluores- 

 cence, 312, 313 

 on redox potential, 324-326, 328 

 infrared absorption, 283 

 infrared analysis, 268 

 limiting factor for photosynthesis, 312 

 reduction of, in dark, 310 

 in light, 310 

 Carbon dioxide acceptor in photosynthe- 

 sis, 316-320, 324, 328, 329, 341 

 Carbon>i dioxide, 315-320, 323, 334 

 Carbon monoxide myoglobin, photolysis, 



333 

 Carcinus, hue discrimination, 666 



vitamin Ai in eye, 624 

 Cardium, ocelli, 638 

 Carotene, 468, 471, 473 

 as photoreceptor, 527, 540 

 {See also Carotenoids) 

 Carotenoid pigments, chlorophyll pre- 

 cursor, 397 

 in seedling extracts, 394, 395 

 Carotenoids, 303-306, 308, 309, 352, 354, 

 356, 470 

 a carotene, 354, 356 

 of bacteria, 371, 373-377, 382-388 

 /3 carotene, 356 



as conjugated molecule, 19 

 as current carrier, 20 

 energy transfer from, 343, 356, 367- 



370, 385-388 

 fluorescence of, 365 

 fucoxanthin, 305, 306, 308, 331, 332, 



352, 353, 356 

 lutein, 356 

 (See also Spectra) 

 Catalase, 536 



Caterpillars, visual identification by, 670 

 Caurasius (Dixippjis), 653 

 Cavernicolous arthropods, 653, 655, 658 

 Celosia, 529 



Centrifuging algal cells, 276 

 Centrostephanus, photic responses, 660- 



661 

 Cephalodiscus, possible eyespot, 662 

 Cephalopod eye, 641 



dark and light adaptation, 664 

 pigment change, 623 

 Cephalopsin, 624 

 Ceramium rubrum, 358 

 Cercaria, eyespots, 631 

 Cerianthus, photosensitivity, 628 

 cgs units, 135 



Chaetognatha, photosensitivity, 632 

 Charge transfer, 45 



in anthracene self-quenching, 46 

 and photo-oxidation, 45 

 and photoreduction, 45 



Chemical affinity and collision, 25, 35 

 and energy transfer, 29 

 in quenching, 47 

 Chemical changes, transient, 288 

 Chemiluminescence, 52-56 

 in biological systems, 53 

 of flames, 55 

 of luminal solutions, 53 

 in simple ionic reactions, 53 

 of sodium oxide, 54 

 Chemodormancy, definition, 520 



(*See also Dormancy) 

 Chemosensibilization, 521 

 Chilopoda, photoreceptors, 645-646, 656 

 Chironomus, blinding experiments on, 643 

 Chiton, photosensitivity, 637 

 Chlamydomonas sp., 352, 353 



photosensitivity, 626 

 Chlorella sp., 359-361, 367 



chlorophyll fluorescence, 308, 314, 315, 



327 

 Hill's reaction by, 323 

 mass culturing, 294 

 photosynthesis by, 316-318 



and phosphate metabolism, 329, 330, 



341 

 and redox potentials, 341 

 pigment systems, 303 

 Chlorin-e4, 109 

 Chlorins, 96 



predicted and observed spectra, 112- 

 113 

 Chloris ciliata, 521, 523, 527, 528, 533, 



537, 538, 540 

 Chlorophor, 397 



Chlorophyll, 17, 296, 299-311, 344, 345, 

 351, 352, 354, 355, 371-384 

 absorption spectra, 301, 302, 305-307 

 bacteriochlorophyll {see Bacterio- 



chlorophyll) 

 bacterioviridin, 302, 304-306, 370,'372, 



393 

 fluorescence quenching, 46 

 fluorescence-sensitized, 59 

 as photoreceptor, 527, 540 

 and photosensitivity, 702 

 Chlorophyll a, 96, 109, 113, 304-306, 308- 

 310, 331-333, 344, 353-355 

 absorption curve, 404 

 accumulation of, in intermittent light, 

 416 

 temperature dependence, 418, 419 

 destruction by light, 408 

 distribution, 393 

 first formation in light, 396, 407 

 fluorescence, 114, 115 

 in seedling extracts, 394, 395 

 structural formula, 400 

 synthetic path to protochlorophyll, 400 



