752 



RADIATION BIOLOGY 



Gases, influence on photoblastism, 528- 



529, 537 

 Gastropoda, photoreceptors, 640-641 

 Gateways, for energy transfer, 22, 23 

 in quenching and photosensitization, 41 

 temperature dependence, 23 

 for vibrational-energy exchange, 24 

 Geeldikkop, 710, 714 

 Geniculate body, electrical responses, 



606, 610 

 Gentiana andreivsii, 527 

 Geotropism, 466 

 Germanium photocell, 237 

 Germination energy, 538 

 Gerris, flicker detection, 668 

 Glossina, visual acuity, 658 

 Glucose, 323 

 Glycine, 319, 320 

 Glycolic acid, 318-320 

 Gonionemus, latency of photic response, 



664 

 photosensitivity, 629 

 Gonium, photosensitivity, 627 

 Grana, 296, 300, 301, 328 

 Hill's reaction by, 321, 322 

 structure, 301 

 Gratings, diffraction, 204-210 



angular dispersion, 205 



blaze angle, 206 



comparison with prisms, 210 



echelette, 203 



groove angle, 206, 207 



linear dispersion, 205 



replica, 205 



transmission, 203 



Wood, 206 

 Green algae, 306 

 Green flagellates, 306 

 Green sulfur bacteria, 298, 302, 306, 341, 



371, 372 

 Griffithsia sp., 357 

 Gypsophila, 528 

 Gyrinus, divided compound eye, 657 



H 



Haliotis, ocellus, 634 

 Haploops, compound eyes, 655 

 Heavy-atom effect on phosphorescence, 



85, 114 

 Heisenberg uncertainty principle, 36 

 Helix, ocelli, 640 

 Helodea, 329 



Hemichordata, photosensitivity, 662 

 Hemin, 111 

 Hetero replacement, effect on spectra, 81, 



83, 90-92 

 Heterocyclic molecules, 88 

 Heteropods, camera-style eyes, 641 



Hexose diphosphate, 323 

 Hexose monophosphate, 323 

 Hill reaction, 281, 296, 321-324, 328, 359. 

 360 



by Chlorella cells, 323 



by chloroplasts, 296, 321, 323, 328 



flashing-light experiments on, 323 



by grana, 321, 322 



hydrogen acceptors, 296, 321-323 



and induction phenomena, 324 

 Hippolyte, hue discrimination, 666 

 Hirudinea, photosensitivity, 636-637 

 Hirudo, effects of neural surgery on, 636 

 Holcus lanatus, 536 

 Holochrome, definition, 398 

 Holothiiria, orientation to light, 662 

 Holothuroidea, photosensitivity, 662 

 Holtzmark line broadening, 51 

 Homarus, neuronal photoreceptors, 642 

 Honeybee (see Apis) 

 "Hot" atoms, 42 

 Hue discrimination, 650, 666, 667 

 Humidity, relative, influence on photo- 

 sensitivity, 531 

 Hund rule, 82, 100 

 Hydra, photosensitivity, 628 

 Hydrocarbons, cracking, 51 



fluorescence, 16 

 Hydrochloric acid number, of proto- 

 chlorophyll, 401 

 minus phytyl, 401 

 Hydrogen, 298, 306, 307, 322, 324-327 



influence on redox potentials, 324-327 



persistence of rotation, 24 



rotational quanta, 20 

 Hydrogen acceptors, in Hill's reaction, 

 296, 321-323 



in photosynthesis, 310, 321 

 Hydrogen donors, influence on fluo- 

 rescence, 311-313 



in photosynthesis, 297-299, 310, 312, 

 320-322, 333, 334 

 Hydrogen sulfide, 298, 322n. 

 Hydrogenase, 326, 327 

 Hydroides, photosensitivity, 635 

 H y menocallis occidentalis, 540 

 Hyperia, compound eyes, 655 

 Hypericism, 708 



Hyperinids, compound eyes, 655 

 Hypertrophy, compound eye, 653-654 

 Hypocotyls, Helianthus, 473, 474 



Raphanus, 466, 473, 474 



ICI coefficient, 137 

 Icterogenin, 711 



Idotea, eye-pigment migration, 669 

 Illuminance, 127, 135 



