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1.
Cerebrosterol (2 4S hydroxycholesterol,1)formedinsmallamountsinhumanandanimalbrain1fromcholes terolisimportantforcholesterolhomeostasisinthisorgan .Theexcesscholesterolisconvertedinto 2 4S hydroxy cholesterolbyauniquebrain specific 2 4S hydroxylase ,whichcouldber… 相似文献
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Synthesis and Structure of Inclusion Complex of Cyclomaltoheptaose(β—Cyclodextrin)with m—Aminophenol
IntroductionSupramoleculeisakindofsystemwithspecialstruc turedependingontheweakmolecularinteractions (suchasvanderWaals ,hydrogenbond ,electrostaticandhy drophobicinteractions) .Theweakinteractionsarerelatedtobiologicalprocesses ,forexample ,thecatalyticrea… 相似文献
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Nitronicacidsandnitronicestersarespecialspeciesoforganiccompounds,whosestrikingpropertyisinstability[1—3].Duetothisreason,studiesrelatedtothesespecieshaveprogressedveryslowly.Recently,wereportedthesynthesisofstablenitronicacidIandnitronicesterII[4—6](fig.1),a… 相似文献
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BasedonthecrystalstructuredatafromXrayanalysis[1,2]andthespectralpropertiesofeachchromophoreofCPC[3,4],Sauerandcoworkers[5,6]expectedthatthedynamicsofenergytransferprocessesshouldtakeplacewithin10—30pstimescalebetweentwotrimersofCPChexamer.Furthermore,Zhaoandco… 相似文献
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Recentprogressinsurfacespectroscopyandmolecularbeamscatteringanddetectiontechniquesmakesitnowpossibleatthemicroscopicleveltoaccuratelymeasuresuchthingsasdissociationrates,adsorbatebindingandgeometry,andmobilitiesofadsorbedspeciesonsurfaces.Thiskindofe… 相似文献
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IntroductionThesupramolecularcomplexeformedbytheweakinteractions (electrostaticinteraction ,hydrogenbonds ,vanderWaalsforce ,short rangeexclusionforce ,etc .)ofmorethantwosortsofspeciesisanorganizingentitythatusuallypossessesspecialstructureandfunction .1Sup… 相似文献
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IntroductionItiswellknownthatyttriumcanbeusedinmanyfields ,suchasmetallurgy ,ceramics ,lasersandelectron ics ,especiallyinfluorescentmaterialswhoseneedforhighpurityyttriumoxideisincreasing .InChina ,there sourceofyttriumisrich ,andthehighpureyttriumisbe ingo… 相似文献
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《中国化学快报》1996,(10)
Co ̄ndenceauthor.Oaf((k6<l)adspeciesPeakswerefoundtodisappearat573'K.Duringthetemperatureelevation,theCeOZFZgandO2-Peakswerefoundtobroadenandshifttolowerwavenumbers.ThefhaluencyshiftwilhresecttotemperatureisawellknownphenomenoninRamanspectroscopyofsolidsanditisrelatedtothetherma]expansionoflatticeparameters.At1023'K,theO2-adspecies(at1159cm-l)andCeOZF2,(at449cm-l)peakswerefoundtoremainexistingonthesurfaceofceriumoalde.WhentheOZ-pretreatedCeOZsamplewaswarmedsuccessivelyinaflowofCd,thereachonsofCabwithlaniceo 相似文献
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Incomparisonwiththealuminumanalogues,boroncontainingMFItypezeolitehasbeenexpectedtohavemilderacidicpropertiesandspecificcatalyticperformance.Uptonow,muchworkhasbeendoneinthisaspect[1—5],includingsynthesis,structuralcharacterizationandcatalysis,etc.Therear… 相似文献
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IntroductionExchange coupledpolynuclearcopper(II)complex esareofspecialinterestduetotheirinvolvementinbio logicalprocessesandininorganicmaterials .1,2 Theinti materelationshipbetweenthespincouplingandthemolecularstructurehasfosteredtheemergenceofmolec ular… 相似文献
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IntroductionCalorimetryhasbeenusedinmonitoringcellularmetabolismbymeansofheatmeasurements ,especiallyinstudyingmetabolismincellsandwholeorganism .1,2 Mi crocalorimetryisalsousedinmeasuringtheeffectsofvar ioussubstancesandcultureconditionsonmetabolism .Mile… 相似文献
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Purification and Characterization of an Antibacterial Peptide from Rana Temporaria Chensinensis Skin 总被引:1,自引:0,他引:1
GOU Xiao jun LI Xiang hui DING Tian bing WANG Yong ting CHEN Huai yong HUANG Cheng fang DONG Qing chu LI Qing shan * 《高等学校化学研究》1999,(4)
IntroductionInadditiontothehighlyspecificcell-mediatedimmunesystem,vertebratesandotherorganismshaveadefensesystemmadeupofdistinctgroupsofbroad-spectrumantibacterialpeptides[1—3].Antibacterialpeptidescanbeclassifiedintotwogroupsbasedonhavingdisul-fide… 相似文献
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Introduction Non covalentinteractionshaveabiginfluenceontheconformationalorganizationofthebiomoleculeswhichisresponsiblefortheregio andstereo specificityofvariousbiologicalprocesses .1Amongtheseinteractions ,thein tramolecularstackinginteractionbetweens… 相似文献
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IntroductionInthepastdecades ,considerableresearchworkhasbeenfocusedonthefluorinatedionomers1 4 whichhaveexceptionalthermalandchemicalstabilities .5Thereforetheyhaveshownspecialapplications ,suchasmembraneseparationintheelectrochemicalprocessesandsuperaci… 相似文献
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Introduction4 ,5 Dihydropyrazolederivativeshavebeenstudiedextensivelyduetotheirdiversechemicalreactivity ,broadspectrumofbiologicalactivityandvarietyofindustrialap plication .1Inaddition ,itisknownthat 4 ,5 dihydropyra zolederivativeswereusefulcompoundsnotonl… 相似文献
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IntroductionCycloadditionreactionshavebeenextensivelyusedinorganicsyntheses,especialyinthesynthesesofmedicine,aromatizerandna... 相似文献
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Itisdifficultandevenimpossibletodeterminebyregularkineticsmethodssomekineticsparametersofsomecomplexchemicalreactions,especiallypolymerizationreactionswhosemechanismshavenotbeenknown.Wehavetriedtosolvethisproblembythemethodofregressionandsimulationofc… 相似文献
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Interleukin-2(IL-2)isa133-aminoacidlymphokineproteinsecretedbyactivatedT-cels.Itsbiologicalefectsaremediatedbybeingboundtospe... 相似文献