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- W2024955057 abstract "By employing diphenylhexatriene steady-state fluorescence anisotropy, pyrenedecanoic acid excimer formation, and high sensitivity scanning calorimetry we have demonstrated that the liposomes containing phosphatidylethanolamine (PE) and various mole fractions of ganglioside GD1a had a gel-liquid crystalline phase transition between 15 and 25 degrees C. Calorimetric measurements indicated that these phase transitions were broad and centered between 17 and 21 degrees C. The enthalpy change of the transition was linearly dependent on the ganglioside concentration up to 10.0 mol% and plateaued between 11.4-16.2 mol%. The high enthalpy change (37 kcal/mol of GD1a added into the PE bilayer) indicates the existence of PE-GD1a complex structure in the liposomal membrane. It is proposed that semi-fluid domains containing six PE and one ganglioside molecule are present in the PE-GD1a membranes at temperatures above gel-liquid crystalline phase transition. The Sendai virus induced leakage of PE-GD1a liposomes has been investigated by using an entrapped, self-quenching fluorescent dye, calcein. The leakage rate was dependent on the mole fraction of ganglioside GD1a and was maximal at 6.3 mol%. Arrhenius plots of the leakage rates showed breaks in the 20-25 degrees C temperature range, which correspond to the gel-liquid crystalline phase transition of the target liposomes. These data suggest that the rate of Sendai virus-induced leakage can be regulated via fluidity modulation by changing the PE to GD1a ratio at constant temperatures." @default.
- W2024955057 created "2016-06-24" @default.
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- W2024955057 date "1987-06-01" @default.
- W2024955057 modified "2023-09-26" @default.
- W2024955057 title "Thermodynamic and phase characterizations of phosphatidylethanolamine and ganglioside GD1a mixtures" @default.
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- W2024955057 doi "https://doi.org/10.1016/0005-2736(87)90280-x" @default.
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