LiposomesUnilamellar LiposomesPhosphatidylcholinesLipid Bilayers1,2-DipalmitoylphosphatidylcholineDrug CarriersPhospholipidsCholesterolKineticsPhosphatidylglycerolsMembranes, ArtificialPhosphatidylethanolaminesDimyristoylphosphatidylcholineMembrane LipidsFluoresceinsSpectrometry, FluorescencePhosphatidylserinesPermeabilityScattering, RadiationMembrane FusionMembrane FluidityBiophysicsBiophysical PhenomenaCalorimetry, Differential ScanningDiphenylhexatrieneSphingomyelinsFreeze FracturingMicellesPhase TransitionFluorescent Dyes