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• W2023622281 endingPage "1948" @default.
• W2023622281 startingPage "1937" @default.
• W2023622281 abstract "The long-range diffusion coefficients of isoprenoid quinones in a model of lipid bilayer were determined by a method avoiding fluorescent probe labeling of the molecules. The quinone electron carriers were incorporated in supported dimyristoylphosphatidylcholine layers at physiological molar fractions (<3 mol%). The elaborate bilayer template contained a built-in gold electrode at which the redox molecules solubilized in the bilayer were reduced or oxidized. The lateral diffusion coefficient of a natural quinone like UQ10 or PQ9 was 2.0 ± 0.4 × 10−8 cm2 s−1 at 30°C, two to three times smaller than the diffusion coefficient of a lipid analog in the same artificial bilayer. The lateral mobilities of the oxidized or reduced forms could be determined separately and were found to be identical in the 4–13 pH range. For a series of isoprenoid quinones, UQ2 or PQ2 to UQ10, the diffusion coefficient exhibited a marked dependence on the length of the isoprenoid chain. The data fit very well the quantitative behavior predicted by a continuum fluid model in which the isoprenoid chains are taken as rigid particles moving in the less viscous part of the bilayer and rubbing against the more viscous layers of lipid heads. The present study supports the concept of a homogeneous pool of quinone located in the less viscous region of the bilayer." @default.
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• W2023622281 date "1998-04-01" @default.
• W2023622281 modified "2023-10-18" @default.
• W2023622281 title "Electrochemical Measurement of Lateral Diffusion Coefficients of Ubiquinones and Plastoquinones of Various Isoprenoid Chain Lengths Incorporated in Model Bilayers" @default.
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• W2023622281 doi "https://doi.org/10.1016/s0006-3495(98)77902-0" @default.
• W2023622281 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1299536" @default.
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