228 



METABOLISM AND PHYSIOLOGY 



Argon + Factor 



Aerobic -I- Factor 



Argon, Endogenous 



Aerobic, Endogenous 



D— 



4 6 8 10 



TIME IN MINUTES 



12 



14 



Fig. 4. Effect of anaerobic conditions and time on photophos- 

 phorylation with R. rubrnni chromatophores in the absence and 

 presence of the factor isolated from R. riibrioH. 



