1710 CHEMICAL PATH OF CARBON DIOXIDE REDUCTION CHAP. 36 



(or stages) of the reduction mechanism of photosynthesis, HNOs may be- 

 come substituted for CO2 as hydrogen acceptor whenever photosynthesis is 

 carried out in a nitrate-containing medium. Various possibiHties of this 

 coupHng can be envisaged, such as nitrate serving as Hill oxidant in com- 

 petition with carbon dioxide (as oxygen competes with quinone according 

 to Mehler, c/. chapter 35, section B4). Another possibility is that of 

 nitrate substituting for oxygen as oxidant in the often postulated partial 

 reversal of the primary photochemical process. 



Bibliography to Chapter 36 

 Chemical Path of Carbon Dioxide Reduction 



A. Isotopic Tracer Studies 



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1941 Frenkel, A. W., Plant Physiol, 16, 654. 



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