PH-T R I S E 4- PH 



\ 



+ 2 H 



^GLUCOSE 

 < + PH 



H.DPN 



PH-G L Y C E R Y L^^PH 



/ t 



PH-G LYCERATE + AD'^PH 

 / 

 PYRUVIC 



E N L~PH 



FUMARATE + PH 



rH-O L Y c t- 



/^ /a>-PH— ► 



2PYRUV1C / 



E L-~PM 



2 PYRUVIC AC. 



Figure 3. — Schemes for anaerobic breakdown (upper cycle) and aerobic re- 

 syntliesis (lower cycle) of carbohydrate. (From F. Lipmann, Advances in 

 Enzymology, vol. 1, 1941.) 



