AEROBIC PHOSPHORYLATION IN R. RUBRUM 



167 



Fig. 3. Activity profile of Crude Photo synthetic Ex- 

 tract—Crude photo synthetic extract, 6.0 mg protein, 

 was centrifuged and analyzed as in Fig. 1. One arbi- 

 trary unit represents (in terms of each undiluted frac- 

 tion): for OD28O (open triangles), an optical density of 

 1.0 at 280 m^; for ODgSO (chlorophyll, open circles), 

 an optical density of 0.17; for succinic dehydrogenase 

 (squares), 5.4 m^raoles indophenol reduced/ml /min; 

 for DPNH oxidase (triangles), 4.5 m/imoles DPNH 

 oxidized/ml /min; and for M-6-P (circles), 0.68 

 m^ moles M-6-P formed/ml/min. 



