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• W2031616615 endingPage "330" @default.
• W2031616615 startingPage "323" @default.
• W2031616615 abstract "The fluorescence of Merocyanine 540 (MC 540) is sensitive to the molecular packing of membrane lipids. Therefore, the fluorescence of MC 540 is expected to be sensitive to the curvature-related packing stress at the onset of the lamellar-hexagonal phase transition. We measured the fluorescence intensity of MC 540 when the temperatures of lipid bilayers approached their lamellar-hexagonal phase transitions. The fluorescence of MC 540 in the presence of egg and dioleoylphosphatidylethanolamine bilayers increased at the respective lamellar-hexagonal phase transitions of these lipids. Furthermore, increases in fluorescence intensity were also observed at temperatures just below their phase transitions. The enhanced fluorescence was not due to the specific interaction of the dye with the ethanolamine headgroup, because no such increase was observed when the probe was exposed to phosphatidylethanolamines which do not form hexagonal phase within the range of applied temperature. In addition, when the temperature of the lamellar-hexagonal phase transition was shifted, by the addition of a small amount of phosphatidylcholine, the dependence of the fluorescence intensity on temperature was modified accordingly. We postulate that the change of MC 540 fluorescence intensity at temperatures approaching the lamellar-hexagonal phase transition reflects changes in the partition of MC 540 into the fluid lipid phase. The change in partition is influenced by the curvature stress in bilayers at temperatures just below the lamellar-hexagonal phase transition." @default.
• W2031616615 created "2016-06-24" @default.
• W2031616615 creator A5022084529 @default.
• W2031616615 creator A5076638483 @default.
• W2031616615 date "1999-01-01" @default.
• W2031616615 modified "2023-10-18" @default.
• W2031616615 title "Merocyanine 540 as a fluorescence indicator for molecular packing stress at the onset of lamellar-hexagonal transition of phosphatidylethanolamine bilayers" @default.
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• W2031616615 doi "https://doi.org/10.1016/s0005-2736(98)00185-0" @default.
• W2031616615 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9889390" @default.
• W2031616615 hasPublicationYear "1999" @default.
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