379 



C.P. i-Jhittingham and P.M. Bishop 



that a concentration effect may also be concerned, since it is not 

 always possible to obtain enhancement. 



Flash illumination following continuous background illumination 



The data obtained from a 

 plasts reducing ferricyanide 

 sent, in which the flash was 

 by a finite dark interval, i 

 on the graph shows the resul 

 of 653 mp and a flash of 697 

 creases as the time between 



series of experiments with chloro- 

 with phosphorylating cofactors pre- 

 separated from the background light 



s shown in figure 3. The lowercurve 



ts obtained with a background light 

 mp. The yield from the flash in- 



the termination of the background 



% Increase 



80 



60 



40 



20 



Figure 3 Percentage increase in oxygen yield per flash as a 



function of the time interval betvjeen the cessation of the 

 background light and the flash. The percentage is expressed 

 as the increase in yield compared to the flash given in 

 darkne s s . 



O Yield from 697 mp flash following illumination at 653 mp 

 • Yield from 644 mp flash following illumination at 700 mp 



