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- W2005514239 abstract "Abstract 1. 1. Incubation of acetone-extracted and unextracted heart-muscle preparations with ubiquinone (coenzyme Q) and its homologues has shown that these compounds are taken up by the particles. 2. 2. The extent of the uptake is related to the length of the isoprenoid side-chain of the homologue. The shorter side-chain length homologues, ubiquinone(10) and ubiquinone(15), are taken up to the greatest extent and in amounts up to 20 times the normal concentraton of the endogenous ubiquinone. Aurantiogliocladin (2,3-dimethoxy-5,6-dimethylbenzoquinone) which differs from ubiquinone in that a methyl group replaces the isoprenoid side-chain does not become attached to the particles. 3. 3. Acetone-extracted particles which had been incubated with ubiquinones(10) and (15) showed the greatest degree of restoration of succinate oxidase activity. In terms of specific efficiency ( i.e. reactivation of succinate oxidase system per molecule quinone taken up) ubiquinone(5) appered to be more efficient than ubiquinone(10). It was shown also that the efficiency of reactivation is also related to the total number of molecules taken up. The efficiency increases up to a certain concentration (0.5 μmoles/g in the case of ubiquinone(15)) and then falls with increasing uptake of quinone. 4. 4. The vitamin K group shows a similar pattern of uptake as the ubiquinones. Vitamin K 3 (menadione) is not taken up while vitamin K 2 (10) combines with the particles to a greater extent than either K 2 (5) or K 2 (25)." @default.
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- W2005514239 date "1964-11-08" @default.
- W2005514239 modified "2023-09-23" @default.
- W2005514239 title "The uptake of ubiquinone and vitamin K homologues by heart-muscle particles" @default.
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- W2005514239 doi "https://doi.org/10.1016/0304-4165(64)90375-7" @default.
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