245 



F. R. Whatley 



I 



S 

 ^ 



I 



0.3 



05 



0.7 



1 1 1 1— 



Photooxidotion of reduced 

 cytochrome c by Q^ 



09- 



l.l 



$=* 



light 



4 6 



minutes 



8 



10 



Fig. 1 . Experimental details 

 as described by Nieman and 

 Vennesland (5). A decrease 

 in O.D. at 550 \Wi corresponds 

 to the oxidation of ferro- 

 cytochrome c. 



06 



I 09[- 



10 



II 



Photooxidatlon of cytochrome c 

 in argon by TPN 



ligttt 



-TPN 



6 8 



minutes 



10 



12 



Fig. 2 . Experimental details 

 as in Fig. 1, except that a 

 partially purified preparation 

 of "photosynthetic pyridine 

 nucleotide reductase" (11) 

 was added to each vessel, and 

 1 i,imole TPN was added as 

 indicated. 



Fig. 5 . Experimental details 

 as in Fig. 2, except that 

 f errocytochrome £ was re- 

 placed by 20 lamoles ascorbate 

 + 0.2 umoles dichlorophenol 

 indophenol (both omitted in 

 "-ascorbate" treatment). 

 Increase in O.D. at 3^0 mn 

 corresponds to reduction of 

 TPN. 



