Glucose Glyceraldehyde3-② NAD' 为何需要发酵？ NAD' NADH+H' NADH +H'. 1,3-bisphosphoglycerate 细胞内的NAD+有限，需 要将形成的NADH转变回 Pyruvate NADH +H' NAD+（NAD+的再生) NAD Lactate X NADH+H' NAD Pyruvic Acld Streptococcus, Saccharomyces Propionibacterium Clostridium Escherichia, Enterobacter Organism Lactobacillus, (yeast) Salmonella Bacillus Lactic acid Ethanol Propionic acid, Butyric acid, Ethanol, Ethanol,lactic Fermentation and CO2 acetic acid, butanol,acetone, lactic acid, acid,formic acid, End-Product(s) CO2,and H2 isopropyl alcohol. succinic acid, butanediol,acetoin, and CO2 acetic acid, CO2.and H2 CO2,and H2Shanghai Jiao Tong University 为何需要发酵？ 细胞内的NAD+有限，需 要将形成的NADH转变回 NAD+（ NAD+ 的再生）