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• W2014871165 abstract "The ultrasonic absorption of large unilamellar vesicles (average diameter 0.2 micron) was determined in the frequency range 0.5-5 MHz. The liposomes were composed of a 4:1 mixture by weight of dipalmitoyl phosphatidylcholine and dipalmitoyl phosphatidylglycerol. They were studied with and without cholesterol or gramicidin incorporated into the bilayer. A large increase in absorption occurs at the solid to liquid-crystalline phase transition temperature (42 degrees C) of the pure lipid vesicles. This increase in absorption is interpreted as a structural relaxation of the 'melting' fatty acid chains occurring with an average relaxation time of 76 ns. The liposomes were also found to be extremely permeable near the transition temperature. Essentially complete release of cytosine arabinoside, a small water-soluble molecule, occurred at 42 degrees C. Addition of cholesterol or gramicidin to the bilayer of the liposomes broadened the ultrasonic absorption and reduced the efflux of cytosine arabinoside at the phase transition. No increase in absorption was observed at the transition temperature in the presence of 50 mol% of cholesterol. Gramicidin, in addition to broadening the transition, slows the isomerization of bonds in the hydrocarbon chains of the lipids. A concentration of 5 mol% gramicidin increased the average relaxation time to 211 ns." @default.
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• W2014871165 date "1984-01-01" @default.
• W2014871165 modified "2023-10-16" @default.
• W2014871165 title "Ultrasonic evidence for structural relaxation in large unilamellar liposomes" @default.
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• W2014871165 doi "https://doi.org/10.1016/0005-2736(84)90021-x" @default.
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