749 



Constantine Sorokin 



provide most direct proof for changes in the distribution of 

 energy in the primary photochemical act, changes bound with cell 

 development. 



Thus, a cell never stands still. It is in a constant flux. 

 An interplay of biological factors may explain the inconsistency 

 of observations on photosynthetic activity of cells. Of these 

 factors, shifts in the age composition in a batch of cells under 

 investigation and changes in the size of the active part of 

 metabolic mechanism in each particular cell, as affected by 

 metabolic turnover, deserve thoughtful consideration. 



Preparation of this article was supported by funds from the 

 National Aeronautics and Space Administration. 



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