. Currents in biochemical research. Biochemistry -- Research; Biochemistry; Research. CARBON DIOXIDE formed earlier can be converted to pyruvic acid by reductive carboxyl- ation, i. e., by reversal of reaction Ilia. We would thus have a cyclic mechanism whereby carbon dioxide and hydrogen entering at various points would emerge as pyruvic acid. The di- and tricarboxylic acids would only act catalytically as carriers of carbon dioxide and hydrogen. This is a reversal of the so-called tricarboxylic acid cycle, which is considered to be an important pathway for the oxidative breakdown of carbohyd
. Currents in biochemical research. Biochemistry -- Research; Biochemistry; Research. CARBON DIOXIDE formed earlier can be converted to pyruvic acid by reductive carboxyl- ation, i. e., by reversal of reaction Ilia. We would thus have a cyclic mechanism whereby carbon dioxide and hydrogen entering at various points would emerge as pyruvic acid. The di- and tricarboxylic acids would only act catalytically as carriers of carbon dioxide and hydrogen. This is a reversal of the so-called tricarboxylic acid cycle, which is considered to be an important pathway for the oxidative breakdown of carbohydrate and fat in cells. Scheme II presents this metabolic cycle, incorporating recent findings concerning some of the intermediate reactions (1,4,13,28). For a more detailed discussion, see Lardy and Elvehjem (14). Scheme n Reversible Tricarboxylic Acid Cycle Carbohydrate fatty acids pyruvate ^. lactate malate -H2O czi'-aconitate. +H2O citrate +H2O -H2O -H:0 fumarate -HK5 +H2O isocitrate -2H + 2H + 2H â 2H succinate oxalosuccinate â¢2H -CO2 + 2H + CO2 + CO2 -CO2 a-ketoglutarate Another mechanism recently suggested for photo- and chemo- syntheses involves a sequence of carboxylations and reductions leading 183. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Green, David Ezra, 1910-. New York, Interscience Publishers, Inc.
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