750 



RADIATION BIOLOGY 



Electron interaction, 82, 99 

 Electron shells of a molecule, 80 

 Electron transfer, 543 

 Electron volt, 132 

 Electronic transitions, 3 

 Electrons, atomic, 18 



molecular, 18 



optical, 16 



trapped, 543 

 Electroretinogram (ERG), 584-594 



human, 591-594 



clinical use of, 593-594 

 with colored lights, 592-593 

 in dark adaptation, 591-592 

 in relation to area, 593 



invertebrate, 585-587, 649-650 



vertebrate, 587-590 



components of, 588-590 

 Eledone, 642, 664 

 Elysia, visual field, 640 

 Emerson carbon dioxide burst, 271, 272, 



282 

 Emission of light by molecules, 82 ff . 

 Endosperm, effect on photoblastism, 533, 



537 

 Energy, activation, 12, 22, 261, 543 



of collision, 22 



coulombic, 9 



exchange, 9 



germination, 538 



internal conversion of, 11 



luminous, 126-128 



measurement of, 263-265 



radiant (see Radiant energy) 



of red light, 262 



resonance, 14 



zero-point, 3 

 Energy-level diagram, 79, 82, 83, 88 

 Energy levels, electronic distribution, 6, 



12 

 Energy migration, intramolecular, 30 

 Energy transfer, 85, 86 

 gateways for, 22, 23 

 in photosynthesis, 296, 303, 307-314, 

 316, 324, 330-334, 341 

 influence on, of carbon dioxide, 312- 

 314 

 of hydrogen donor, 311-313, 316 

 between pigments, 304, 308, 309, 331, 

 332, 343, 356, 367-370, 385-388 

 Entropy, activation, 22 



of collision, 22 

 Enzymes, 58 

 amylolytic, 536 

 lipolytic, 536, 539 

 photoinactivation of, 542 

 proteolytic, 536 

 Epeira, visual identification, 669-670 

 Ephestia mutants, photic reactions, 659 



Epilobium, 528, 530, 531 

 hirsuium, 522, 524 

 roseum, 522 

 ERG (see Electroretinogram) 

 Eristalis, dark adaptation, 664 

 flicker detection, 668 

 hue discrimination, 667 

 visual identification, 670 

 Eristalomya {see Eristalis) 

 Eschscholzia, 528, 530, 531 

 Ethylene spectrum, 72, 79 

 substitution effects, 88 

 twist about double bond, 86 

 Etiolation, 490 



action spectrum, 487 

 Etiohn, 397 

 Etioporphin, 96 

 Eucone ommatidium, 647 

 Eudendrium, summation, 668 

 Euglena, photosensitivity, 626-627 

 Eunice, swarming habits, 634 

 Eupolyodontes, eyes, 632-633 

 Eurypterids, compound eyes, 646 

 Excited molecule, 543 

 Excited states, chemical reactions, 94 

 "Exciton" migration, 44, 333 

 in photography, 45 

 of pseudoisocyanine dyes, 45 

 Exocone ommatidium, 647 

 Experimental measurements, analysis, 



282 

 Extra carbon dioxide, 448 

 Extra oxygen, 450 

 Eyes, compound, definition, 624 

 human, cone vision, 137 

 day vision, 137 

 luminosity coefficients, 137 

 luminosity curve, 137 

 night vision, 137 

 photopic curve for, 137 

 rod vision, 137 

 scotopic curve for, 137 

 spectral sensitivity, 137 

 of Standard Observer, 137 

 tristinuilus system, 137 

 Eyespots, compound, defined, 624 

 simple, in archiannelids, 632 

 defined, 624 



in larval hemichordates, 662 

 pigmentless, 631 

 in trematodes, 630-631 



// number, 143 

 Fagopyrism, 693, 708 

 False pupil, 652, 657 

 Fasciola, eyespots, 630 

 Fat metabolism, 536 



