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1、weekendingPRL106,158102(2011)PHYSICALREVIEWLETTERS15APRIL2011Long-RangeHydrationEffectofLipidMembraneStudiedbyTerahertzTime-DomainSpectroscopyM.Hishida1andK.Tanaka1,2,*1InstituteforIntegratedCell-MaterialSciences,KyotoUniversity,Kyoto606-8501,Japan2CoreResearchfor
2、EvolutionalScienceandTechnology(CREST),JapanScienceandTechnologyCorporation(JST),Tokyo102-0075,Japan(Received14July2010;revisedmanuscriptreceived11March2011;published13April2011)Thehydrationstateofbiomoleculesisbelievedtoaffecttheirself-assembly.Thehydrationstateo
3、fphospholipidbilayersisstudiedpreciselybyterahertzspectroscopy,bywhichwaterperturbedbyalipidmembraneisdetectedsensitivelyfromtheobservationoftherelaxationdynamicsofwatermoleculesinthesubpicosecondtimescale.Combinedwithx-rayobservationofthelamellarstructureofthelip
4、id,along-rangehydrationeffectonupto45layersofwaterisconfirmed.Mostwatermoleculesinthelamellaefallintothehydrationwater,andcondensationofthemisalsoindicated.DOI:10.1103/PhysRevLett.106.158102PACSnumbers:87.50.U,77.22.d,79.60.Dp,82.70.UvAstheessentialsolventforalll
5、ivingcells,thephysicalofwaterdynamicsshouldbedetected.Althoughtherewaspropertiesofwaterhavebeeninvestigatedwidelyforquitenoefficientexperimentalmethoduntilfairlyrecently,twoalongtime.Especially,thecharacteristicpropertiesoftypesofexperimentshavebeenproposedtodetect
6、thehydrationwateratthesurfaceofbiomolecules,differentultrafastdynamicsofwaterveryrecently:terahertztime-fromthoseofbulkwater,havebeenpredictedtohaveadomainspectroscopy(THzTDS)[1114]andpump-probesignificantroleonbiologicalfunctions,sincebiomoleculesspectroscopy[11,1
7、5].Bothspectroscopiesmeasurearehighlycondensedinacellinthemesoscaletheultrafastdynamics,althoughthesedynamicscannot(nanometer-to-micron)range[1,2].becomparedtoeachotherdirectlyduetothedifferentPhospholipid,whichformsabilayerinwater,isoneofselectionruleofthedynamic
8、almodes[11].ThoughZhaothemostuniversalbiomoleculesinacellasthemainetal.appliedthevibrationalpump-probespectroscopytoacomponentofthebiomembrane.Thehydrat
