https://wiki.tiffa.net/w/index.php?action=history&feed=atom&title=Translations%3AMetabolism%2F15%2Fen 2026-09-09T20:27:51Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.tiffa.net/w/index.php?title=Translations:Metabolism/15/en&diff=109810&oldid=prev 2024-01-22T10:27:09Z

<p>Importing a new version from external source</p> <p><b>New page</b></p><div>A [[vitamin]] is an organic compound needed in small quantities that cannot be made in cells. In [[human nutrition]], most vitamins function as coenzymes after modification; for example, all water-soluble vitamins are phosphorylated or are coupled to nucleotides when they are used in cells. [[Nicotinamide adenine dinucleotide]] (NAD&lt;sup&gt;+&lt;/sup&gt;), a derivative of vitamin B&lt;sub&gt;3&lt;/sub&gt; ([[Niacin (nutrient)|niacin]]), is an important coenzyme that acts as a hydrogen acceptor. Hundreds of separate types of [[dehydrogenase]]s remove electrons from their substrates and [[redox|reduce]] NAD&lt;sup&gt;+&lt;/sup&gt; into NADH. This reduced form of the coenzyme is then a substrate for any of the [[reductase]]s in the cell that need to transfer hydrogen atoms to their substrates. Nicotinamide adenine dinucleotide exists in two related forms in the cell, NADH and NADPH. The NAD&lt;sup&gt;+&lt;/sup&gt;/NADH form is more important in catabolic reactions, while NADP&lt;sup&gt;+&lt;/sup&gt;/NADPH is used in anabolic reactions.</div>

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