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| cold sores, saw palmetto, rheumatism, hardcore galleries plump rumps , big n plump , irritable, echinacea, media, fat ass white girls , vinpocetine, | These electrons are un-coupled from mitochondrial oxidative-phosphorylation and, therefore, do not yield ATP. Since these enzymes cannot introduce sites of unsaturation beyond C9 they cannot synthesize either linoleate (18:2D9, 12) or linolenate (18:3D9, 12, 15). These fatty acids must be acquired from the diet linolenic acid and are, therefore, referred linolenic acid to as essential fatty acids. Linoleic is especially important in that it required for the synthesis of arachidonic acid. As we shall encounter later, arachindonate is a precursor for the eicosanoids (the prostaglandins and linolenic acid thromboxanes). It is this role of fatty acids in eicosanoid synthesis that leads to poor growth, wound healing and dermatitis in persons on fat free diets. Also, linoleic acid is a constituent of epidermal cell sphingolipids that function as the skins water permeability barrier. |
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| The predominant site of these processes is in the ER membranes. Elongation involves condensation of fat ass white girls acyl-CoA groups with malonyl-CoA. The resultant product is two carbons longer (CO2 is released from malonyl-CoA as in the FAS reaction) which undergoes reduction, dehydration and reduction yielding a saturated fatty acid. The reduction reactions of elongation require NADPH as co-factor just as fat ass white girls for the similar reactions catalyzed by FAS. Mitochondrial elongation involves acetyl-CoA units and is a reversal of oxidation except that the final reduction utilizes NADPH instead of FADH2 as co-factor. Desaturation occurs in fat ass white girls the ER membranes as well and in mammalian cells involves 4 broad specificity fatty acyl-CoA desaturases (non-heme iron containing enzymes). These enzymes introduce unsaturation at C4, C5, C6 or C9. The electrons transferred from the oxidized fatty acids during desaturation are transferred from the desaturases to cytochrome b5 and then NADH-cytochrome b5 reductase. |
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