SUBJECT INDEX 



Suspensions of visual cells, 55, 182-186 



Tapetum, 194-195 



Tautog {Tautoga onitis), 35-36, 179 



Temperature, effect on bleaching of, 



42-55, 76-77, 84-90 

 Tench (Tinea tinea), 28, 56, 154, 158- 



162, 178-179 

 Ternary mixture of visual pigments, 



171-175 

 Testudo graeca (JorioiSQ), 154 

 Theories 

 Binary mixture, bleaching of a, 



165-171 

 Dominator, modulator, 5-7 

 Limit of an extinction coefficient, 



82-83 

 Rhodopsin-porphyropsin^ 32-41 

 Thermal decomposition of visual 



purple, 84-90 

 Tinea tinea (Tench), 28, 56, 154, 158- 



162, 178-179 

 Toad {Bombinator bonibinus), 28 

 ToxXo'iSQ {Testudo graeea), 154 

 Transient orange (see also Meta- 

 rhodopsin), 43-51, 54, 76 79-81 

 as an internal filter, effects of, 76 

 density spectrum of, 44, 47 

 dismutation to /ja-rhodopsin and 



indicator yellow, 81 

 indicator yellow, relation to, 45 

 meta-rhodopsin, identity with, 49-50 

 'regeneration' of /50-rhodopsin from, 



45, 79-81 

 stability at low temperature, 47 

 stability when dry, 49 

 stable form in solution, 50-51 

 /m«5-retinenei, 138, 140-141, 144-145, 



147 

 rmw^-vitamin A^, 137 

 Trout 



Brook {Salvelinus fontinalis), 36-37 

 Brown (Salmo fario), 28 

 Rainbow (Salmo irideus), 36, 169- 

 171, 178-179 

 Trypsin, reaction with retinenci, 106 

 Tryptophan, 97 



reaction with retinenCi, 106 

 Tyrosine, 97, 112 

 reaction with retinenej, 106 



Ultracentrifuge, 93 



Ultra-sonic vibrations, 1 1 



Urea, inertness to retinenej, 106-107 



Visual cells, suspensions of, 55, 182- 



186 

 Visual pigment 430 (Green-rod (?) 



pigment of frog), 190-192 

 Visual pigment 467 (Red-insensitive 

 pigment of tench), 161-162, 175- 

 180 

 Visual pigment 497 (Human visual 



purple), 22-23, 99 

 Visual pigment 502 (Frog visual 



purple), 176 

 Visual pigment 507 and 510 (Bleak and 

 Rainbow Trout), 169-175, 178- 

 180 

 Visual pigment 523 (Carp porphyrop- 



sin), 39-41, 163-164, 178-180 

 Visual pigment 533 (Bleak, Tench or 

 Pike porphyropsin), 39-41, 158- 

 162, 169-180 

 Visual pigment 550 (Bleak), 174-175, 



178-180 

 Visual pigments 

 characterization of, 13-23 

 comparisons between, 175-178 

 definition of, 181-182 

 distribution of, 29-30, 32-37, 38^1 

 extinction coefficients of, 178 

 extractants for, 9-13 

 function of, 7 



homogeneity, tests for, 162-169 

 human, 6, 22-23, 99, 203 

 in amphibians (see Amphibians, 



visual pigments of) 

 in birds (see Birds, visual pigments 



of) 

 in fish (see Fish, visual pigments of) 

 in mammals (see Mammals, visual 



pigments of) 

 in reptiles, 28 



in vivo measurements of, 194-204 

 isomerism of, 150-155 

 mixture (binary) of, 169-171 

 mixture (ternary) of, 171-175 

 molecular extinction coefficients of, 



178 

 photomicrographic densitometry of, 



186-193 

 photoproducts of, 41-57 

 preparation of extracts of, 7-13 

 purity of extracts of, 39-41 

 sensitivity to light (see also visual 



purple), 7 

 thermal stability of (see also visual 

 purple, thermochemistry of), 175 



215 



