112 SUBCELLULAR PARTICLES 



of this type. Vitamin K, as well as its analogs, however, does not appear to be 

 involved in the bacterial system. 



In conclusion, it appears that further study of bacterial photophosphorylation, 

 while of interest per se, should also reveal many of the salient features of oxida- 

 tive phosphorylation which may not be directly amenable to study in mitochon- 

 dria and mitochondrial fragments. This expectation derives from the stability of 

 the bacterial chromatophores, together with the absence of a number of compli- 

 cations associated with the obligatory use of oxygen or oxidants of relatively high 

 electrochemical potential as hydrogen acceptors. 



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