744 



RADIATION BIOLOGY 



Algae, green, 306 



high chlorophyll content, 275 



lakes, 277 



logarithmic growth, 275 



pigment spectra, 343-370 



red, 306, 308-310, 356-370 



in tank farms, 278 



water for growing, 276 

 Algal cells, 275, 286 

 Alkaline carbonate buffers, 270 

 AUolobophora, photosensitivity, 635 

 Alternation of bond lengths in conju- 

 gated chains, 78 

 Amaranthus, 521, 525, 528, 529 



caudatus, 521, 525, 526 

 Amaroucium larvae, ocelli, 662 

 Amebas, photosensitivity, 625-626 

 Amidinium ion spectra, 73, 75, 79 

 Ammonia formation, 444 

 Ampeliscids, compoimd eyes, 655 

 Amphineura, ocelli, 637 

 Amphioxus, eyespots, 663 



Joseph's cells, 663 



photosensitivity, 663 

 Amphipods, compoiuid eyes, 655 

 Amplification in photobiological proc- 

 esses, 295 

 Amplifiers, d-c, comparison, 243 



modulation, 242-243 

 Angiosperms, chlorophyll production in 



light, 396 

 Angular momentum, 99 

 Annelida, photosensitivity, 632 

 Antedon, photosensitivity, 659 

 Anthrenus larvae, sensitivity to idtra- 



violet, 666 

 Anthocyanin, 350 

 Anthracene, fluorescence quenching, 44 



self-quenching and charge transfer, 45 

 Anthraquinone, 328 

 Ants, role of ocelli, 646 

 Aperture, 143 

 Apis, conditioned responses, 670 



dark adaptation, 664 



detection of polarization plane by, 654 



divergence of ommatidia, 651 



effective aperture of ocelli in castes, 646 



flicker-fusion rate, 649 



hue discrimination, 667 



intensity discrimination, 650, 669 



sensitivity to ultraviolet, 667 

 Aplopus, dermal photosensitivity, 643 

 Aplysia, photic response, 640-641 

 Aponogeton rdvaceus, 352, 353 

 Apposition type of compoimd eye, 648 

 Arachnids, visual performance, 669-670 

 Aranea, intensity evaluation, 645 

 Arbacia, photic responses, 661 

 Area, compoimd eyespots, 633, 639 



Archiannelida, eyespots, 632 

 Archytas, flicker detection, 668 

 Arcs, alkali-metal, 177-178 



amalgam, 176-177 



cadmium, 176, 177 



carbon, 167-170 



cesium, 177 



helium discharge, 177 



hydrogen, 171-172 



mercury, 173-176 



thallium, 177 



tungsten, 166 



xenon, 172 



zinc, 176, 177 



zirconium, 170-171 

 Argulus, degenerate compound eyes, 656 

 Avion, circus movements, 640 

 ArmadiUidium, compound eyes, 655 

 Artemia, dark adaptation, 664 



effects of blinding, 656 



inverted swimming, 644 



photoreceptors, 644 

 Arthropod compound eyes, binocular 

 field, 652 



duplicity theory, 652 

 Arthropod ocelli, embryonic origins, 643 

 Arthropoda, photoreceptors, 642-659 

 Aschelminthes, photosensitivity, 631 

 Ascidia, photosensitivity, 663 

 Ascorbic acid, 328 

 Asellus, flicker fusion, 668 

 Aspartic acid, 317-319 

 Assimilation, 293 



{See also Carbon dioxide; Photosyn- 

 thesis) 

 Asieracanthion, compound ocelli, 659 

 Asterias, compound ocelli, 659 



righting direction, 659 

 Asterina, compound ocelli, 659 



righting response, 660 

 Asteroidea, photosensitivity, 659 

 Astia, visual identification, 669 

 Astigmatism, in Apis compouml eye, 651 



in cephalopod eyes, 642 



in insect ocelli, 645 

 Astropecten, righting response, 660 

 Athiorhodaceae (nonsulfvu- purple Imc- 



teria), 298, 299, 306 

 ATP, 329, 330 

 Auxin-a, 468-470, 472-474 

 Auxin-/), 468 



Auxin destruction, 469, 470, 473, 474 

 Auxin transport, polarity, 472 

 Auxins, 465-467, 471, 472 



in flowering, 502-504 



redistribution, 466 

 Auxochromes, 88, 89 

 Avena, 328, 463-474, 528 

 Aza substitution, 91-94 



