STRUCTURE OF PHOTOSYNTHETIC BACTERIA 109 



ACKNOWLEDGMENTS 



This work owes much to the generous help and advice given by Dr. J. H. 

 McAlear and his associates on the staff of the Electron Microscope Laboratory. 

 We are particularly indebted to Mr. Lloyd Thibodeau and Mr. Philip Spencer 

 for their technical assistance. Much valuable help in the performance of ex- 

 periments was given by Miss Riyo Kunisawa. 



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