298 LIBERATION OF OXYGEN CHAP. 11 



It was pointed out in chapter 7 that the equality of rates in heavy 

 and ordinary water in weak light does not constitute an argument against 

 the participation of water in the primary photochemical process. There 

 is no reason why the slight difference between the energy contents of the 

 molecules, H2O and D2O, should affect the probability of their photo- 

 chemical transformation, and thus the rate of photosynthesis in the 

 "light-limited" state. 



To sum up: experiments with heavy water have not yet given new 

 clues to the mechanism of water oxidation in photosynthesis, but this 

 does not mean that their further development could not reveal important 

 new facts about this mechanism. 



Some experiments on photosynthesis in tritium oxide will be described in chapter 19 

 (page 557). 



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The Mechanism of Oxygen Liberation 



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