THE VISUAL PIGMENTS AND THEIR PHOTOPRODUCTS 



Thus the porphyropsin group includes pigments with Amax ranging 

 from 524 to 532 mju. Whether these Vitamin Ag' pigments are single 

 or mixtures is undecided, for wald did not test their homogeneity 

 (see Chap. 6). Because of these facts it is better to use *porphyropsin* 



Calculation of the Amax of visual pigments from the data 

 of impure extracts. 



Fish 



Reference 



DmlnlDraax 



^max of 



visual 

 pigment 



Carp 

 {Cyprinus 

 carpio) 



Carp 

 (C. carpio) 



Carp* 

 (C. carpio) 



Perch 

 {Perca 

 fiuviatilis) 



Pickerel 

 {Esox 

 reticulatus) 



Pike 

 (£. lucius) 



Pike* 

 (E. lucius) 



Saito, 1938 



Wald, 1939b 



Crescitelli and 

 Dartnall, 1954 



Collins & Morton, 

 1950a 



Wald, 1939b 



Collins & Morton, 

 1950a 



Dartnall, 1952 



520 



525 



524 



523 



533 

 534 

 529 



532 



535 

 533 



* These extracts have been shown to be homogeneous, i.e. to contain only one 

 photosensitive pigment. 

 t See Fig. 2.6. 



as a generic name for all rod visual pigments based on vitamin Ag 

 rather than as a name for a specific pigment with Amax = 522 m/^. 

 Similar remarks may be appUed to 'rhodopsin.' 



THE PHOTOPRODUCTS OF VISUAL PURPLE 



KOTTGEN and ABELSDORFF Considered that the effect of hght 

 on the visual pigments was to bleach them directly to colourless 



41 



