Fermentation

   I. NAD+ Regeneration
      A. Fermentation
      B. lactic acid
         1. lactate dehydrogenase
      C. Ethanol
         1. step 1 = pyruvate decarboxylase
               1) thiamine pyrophosphate
         2. step 2 = alcohol dehydrogenase
            a. Zn ion
            b. liver
      D. Propionic acid
         1.  org = _Propionibacterium freudenreichii_
      E. Butanol & acetone