495 



M. B. Allen and J. C. Murchio 



% 6 



400 



DISPERSED 



500 



600 



m /i 



V\ 



700 



Fig. 5. Steady state levels of ESR signals in membranous and 

 dispersed P-672 preparations as a function of the 

 wavelength of light used for illiimination. 



400 



500 600 



m/JL 



700 



Fig. 6. Action spectrum for rate of formation of free radicals 

 in a membranous preparation of P-672, 



