Aspects of this topic are discussed in the following places at Britannica.
...ADH and of aldehyde dehydrogenase—require a coenzyme, nicotinamide adenine dinucleotide (NAD), the acceptor of hydrogen from the alcohol molecule, for their effects. The NAD is thus changed to NADH and becomes available again for the same reaction only after its own further oxidation. While adequate ADH seems always present for the first step of alcohol metabolism, the temporary reduction...
...the hydrogen atoms are transferred to the cell’s most important hydrogen acceptors, the coenzymes nicotinamide adenine dinucleotide (NAD+) and flavin adenine dinucleotide (FAD), yielding NADH and FADH2. It is the subsequent oxidation of these hydrogen acceptors that leads eventually to the production of ATP.
...or tendency to attract electrons and thus become reduced, of the thiol-disulfide system is such that most disulfides are reducible by the biological reducing agent nicotinamide adenine dinucleotide (NADH), which has an optimum redox potential for this system. (See chemical reaction: Oxidation-reduction reactions for a discussion of redox reactions.) Proteins containing the mercapto (thiol)...
The two-carbon residues of acetyl-CoA are oxidized to CO2 and water, with conservation of chemical energy in the form of FADH2 and NADH and a small amount of ATP. This process is carried out in a series of nine enzymatically catalyzed reactions in the mitochondrial matrix space. The reactions form a closed cycle, often called the citric acid, tricarboxylic acid, or Krebs...
...ATP molecules and hydrogen; the latter is accepted by the coenzyme (coenzymes are smaller, nonprotein participants associated with certain enzymes) nicotinamide adenine dinucleotide (NAD) to form NADH. The hydrogen on NADH then reacts either with molecular oxygen (O2) to catalyze the release of energy (trapped in the high-energy bonds of ATP) or with another metabolite to reduce...
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