260 



Keelin T. Fry and Anthony San Pietro 



illuminated chloroplasts were measured and it was found that PPNR was re- 

 duced more rapidly than NADP. The kinetics of reduction of PPNR by illumi- 

 nated chloroplasts indicated that the reduced form has the potentiality of 

 acting as an electron carrier between chloroplasts and NADP. 



The research reported herein was supported in part by a grant (GM- 

 10129) to one of us (A. S. P. ) from the National Institutes of Health, United 

 States Public Health Service. Some of the work reported here was presented 

 at a Symposium on Ferredoxins sponsored by the National Science Foundation 

 at the University of Hawaii (August, 1963). Contribution No. 133 from the 

 Charles F. Kettering Research Laboratory. 



We wish to thank Drs. C. H. W. Hirs of the Brookhaven National Labora- 

 tory; M. Armstrong of the Fels Research Laboratory, Yellow Springs, Ohio; 

 and E. Appella of the National Institutes of Health for amino acid analyses. 

 We also wish to thank Dr. R. A. Lazzarini for many helpful suggestions. 



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