72 FERTILIZATION 



TABLE 14 



A, hexose monophosphate shunt ; B, oxidative breakdown of carbo- 

 hydrate, after Horecker (1953). One mole of CO2 is evolved, two 

 moles of TPN are reduced, and one mole of O^ is consumed, per cycle. 

 Two complete cycles will regenerate one mole of glucose-6-phosphate 

 and will produce one mole of tetrose phosphate, which, for the com- 

 pletion of the carbohydrate oxidation, must be converted to glucose- 

 6-phosphate. 



Glycogen 



I 

 TPN+ GIucose-6-phosphate 



TPNH 6-phosphogluconic acid 



i 



6-phospho-2-ketogluconic acid 



I 



Ribulose-5-phosphate 



I 



Ribose-5-phosphate ^ Ribose- 1 -phosphate 



I 



D-glyCeraldehyde-3-phOSphate 



I 



1 



t 

 Lactic acid 



A 



Glucose-6-P 



-2H 



^ 



ST 



\ Mg 



Fructose-6-P -f Tetrose P 



f h 



6-P-Gluconate 



ceraldehyde-3-P 



+ 



Sedoheptulose-7-P 

 B 



CO, 



Ribulose-5-P 



Ribosc-5-P 



