772 



YVETTF. KUNZ 



LDH activity has been investigated in photoreceptors of other mammalian 

 species, of birds and of the frog. The results are not included in this comparison 

 since the respective workers did not include phenazine methosulphate (PMS) in 

 the incubating médium of their kryostat sections. When this électron carrier is 



Distribution of LDH 

 in Retina 



PE 





OS 







IS 







ONL 



M — N 



r- 



OPL 







03 



_o 



INL 



< 





c/j 



IPL 







oj 



GCL 



i 







STRONG 

 ACTIVITY • 



□ o 



WEAK NO 

 ACTIVITY ACTIVITY 



Fig. 19. 



Rabbit, left column 



= diasram based on histochemical results bv Graymore and 

 Kissun 1969. 



Rabbit, right column; monkey = diagrams based on biochemical results by Lowry et al. 1956. 



omitted, the sites of diaphorase activity (and not of dehydrogenase activity) are 

 stained with formazan (Graymore and Kissun, 1969). 



Indirect biochemical approaches, comparing intact retinae with retinae 

 lacking photoreceptors, indicate that the photoreceptors of rabbit and rat possess 

 unusually high respiration and glycolysis (Cohen and Noell, 1965). Thèse 

 authors suggest a compartmentation of respiration and glycolysis within the 



