396 LIGHT AND LIFE 



external surfaces of the grana and are in contact with the stroma 

 of the chloroplast containing the enzyme systems of carbohydrate 

 metaboHsm. Being surfactant and in high concentration, these Hpids 

 may leave insufficient interfacial area for uniform chlorophyll adsorp- 

 tion. Competition for interface adsorption could lead to domains of 

 varied polarity surrounding the groups of associated chlorophyll 

 molecules. 



Acknowledgments 



The author is indebted to the efforts of his collaborators, Drs. J. F. G. M. 

 Wintermans, J. A. Miller, and R. A. Ferrari for information presented in this 

 paper. Corn coleoptile mitochondria were kindly provided by Dr. H. W. Siegel- 

 man. This work was supported by the Atomic Energy Commission, the National 

 Science Foundation, and the Pennsyhania Agricultural Experiment Station. 



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