283 



H. E. Davenport 



Fig. 5 shows that the Clostridium protein is highly active as a "methaemo- 

 globin reducing factor" but is markedly inferior to pea ferredoxin as a "pyridine 

 nucleotide reductase. " 



CLOSTRIDIUM 



PEA 



500 



t 300 



7 

 I 



lOO 



o 



/ 



o 

 o' 



ng added 



I O 

 ferredoxin 



/^ 



1/ 



o 

 / 



ao 



mg added 



o — Met Mb reduced 

 • - NADP reduced 



ferredoxin 



Fig. 5. A comparison of the activities of pea and Clostridium ferre- 

 doxins as catalysts of NADP and metmyoglobin reduction by illumi- 

 nated pea chloroplasts 



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