62 METABOLIC PATHWAYS IN MICROORGANISMS 



gland (26), retina (27), and carp (28). Interesting side re- 

 actions have been uncovered; the occurrence of the pentose 

 cycle as well as the extent of recycling of pentose phosphate 

 in cows were reported by Wood (29). By studying the iso- 

 topic distribution patterns in amino acids, glycerol, and 

 glucose isolated from milk derived from cows fed with spe- 

 cifically labeled substrate, it was possible to detect trans- 

 aldolase exchange, and to enable the author to examine the 

 possible effect of side reactions upon the estimate of glucose 

 metabolic pathways. 



Other reports in the literature permit speculation on the 

 probable role of the pentose cycle in over-all metabolism. 

 These speculations will be reserved for the next lecture, 

 where a more extensive discussion of this cycle will be made. 



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