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StrengthofthermalundulationsofphospholipidmembranesV.I.Gordeliy,1,2,3,*V.Cherezov,3,4andJ.Teixeira51IBI-2:InstituteforStructuralBiology,ResearchCenterJuelich,D-52425Juelich,Germany2CenterforBiophysicsandPhysicalChemistryofSupramolecularStructures,MoscowInstituteforPhysicsandTechnology,Dolgoprudny,Russia3FrankLaboratoryofNeutronPhysics,JointInstituteforNuclearResearch,141980Dubna,Russia4ChemistryDepartment,TheOhioStateUniversity,Columbus,Ohio43210,USA5LaboratoireLéonBrillouin(CEA-CNRS),CESaclay,91191Gif-sur-YvetteCedex,FranceReceived25July2005;published20December2005ThetemperaturedependenceofintermembraneinteractionsinfreelysuspendedmultilamellarmembranesofdimiristoylphosphatidylcholineinD2Owasstudiedusingsmall-angleneutronscatteringSANSandhigh-resolutionx-raydiffractionHRXRD.ThestudyrevealsthattheHelfrich’sundulationforceisthedominatingrepulsionforceattemperaturesabove48.6°Candintermembranedistanceslargerthan20.5Å.At77°Ctheonsetoftheunbindingtransitioninthemultilamellarmembranes...