学科分类
/ 2
24 个结果
  • 简介:Receptor-ligandinteractionsinbloodflowarecrucialtoinitiatesuchbiologicalprocessesasinflammatorycascade,plateletthrombosis,aswellastumormetastasis.Tomediatecelladhesion,theinteractingreceptorsandligandsmustbeanchoredontotwoapposingsurfacesoftwocellsoracellandasubstratum,i.e.,two-dimensional(2D)binding,whichisdifferentfromthebindingofasolubleligandinfluidphasetoareceptor,i.e.,three-dimensional(3D)binding.Whilenumerousworkshavebeenfocusedon3Dkineticsofreceptor-ligandinteractionsintheimmunesystem,2Dkineticsanditsregulationshavebeenlessunderstood,sincenotheoreticalframeworkorexperimentalassayswereestablisheduntil1993.Notonlydoesthemolecularstructuredominate2Dbindingkinetics,buttheshearforceinbloodflowalsoregulatescelladhesionmediatedbyinteractingreceptorsandligands.Here,weprovideanoverviewofcurrentprogressin2Dbindingandregulations,mainlyfromourgroup.Relevantissuesoftheoreticalframeworks,experimentalmeasurements,kineticratesandbindingaffinities,andforceregulationsarediscussed.

  • 标签: 细胞粘附 相互作用 受体 配体 结合动力学 生物学过程
  • 简介:新奇chiral为ligand交换层析(CLEC)的静止阶段(CSP1)被第一把dimethylchlorosilane用作在硅石胶化的表面上为减少的剩余silanol组盖住试剂的结束准备,然后同时作为一个chiral选购者和恐水病的辛基组把l职业人员介绍给硅石胶化表面。CSP1上的14dl氨基的酸的enantioseparations被完成,enantioselectivity和在0.8和6.3之间的决定R从1.09~2.44。有用参考方法准备的结合的阶段(CSP2)的CSP1的色析法的表演被比较。结果证明chiral的列效率和决定R静止阶段能被使用上述修改方法改进。

  • 标签: 氨酰基酯 配体交换色谱法 手征性 光学异构现象
  • 简介:Thedecompositiontemperaturesofthelanthanideorganiccomplexes(η^5-C5H5)2Ln(C6H5CONHO)involvingcyclopentadienylandbenzohydroxamicacidligandswerecalculatedandpredictedbythemodelbasedonANNs(artificialneuralnetowrks)method.ThecomparisonwascarriedoutbetweenresultsfromANNsmethodandtraditinalregressionmethod.ItisprovedthatANNscouldbeusedmoreefficientlyforthepredictionofdecompositiontemperatureoflanthanideorganiccomplexes.

  • 标签: 稀土元素 配合物 人工神经网络 ANNS 结构
  • 简介:Acrylateterpolymer-boundSe,Nbidentateligandwassynthesizedfromthesidechainchlorineofcopolymerandβ-dimethylamino-β′-hydroxyl-diethylselenoether.Thepolymer-supportedplatinumcomplexexhibitedhighcatalyticactivityinthehydrosilylationofolefinswithtriethoxysilane.

  • 标签: 合成 催化活性 铂络合物 双配位基
  • 简介:TherecyclablePEG-boundbi-cinchonaalkaloidligandhasbeensuccessfullyappliedtothehomogeneouscatalyticasymmetricdihydroxylationofvariousalkenes;goodyieldsandexcellentenantioselectivitieswereobtained,Theligandcouldbeeasilyrecoveredandreusedfor10timeswithoutanyapparentlossofitscatalystefficiency.

  • 标签: 对映选择性 二羟基化作用 烯烃 催化 邻二醇 金鸡纳树
  • 简介:Anewanionicdinuclearrutheniumcomplexbeating1,2-bis(diphenylphosphinomethyl)benzene(BDPX)[NH2Et2][{RuCl(BDPX)}2(μ-Cl)3](1)wassynthesizedanditsstructurewasdeterminedbyanX-raycrystallographicanalysis.Thisresultindicatedthatcomplex1consistedofananiondinuclearBDPX-Ruandacationicdiethylarnmonium.Thecrystalbelongedtomonoclinicsystem,C2/cspacegroupwitha=3.3552(7)nm,b=1.8448(4)nm,c=2.4265(5)nm,β=101.89(3)°andZ=8.Thecatalytichydrogenationactivitiesandselectivitiesofcomplex1forcinnamaldehydewereinvestigated,

  • 标签: 双核化合物 钌配合物 催化活性 加氢反应 肉桂醛
  • 简介:Aseriesofcarboxylate-substitutedtrinudearmolybdenumdus-tercompoundsformulatedasMo3S4(DTP)3(RCO2)(L),whereRffiH,CH3,C2H5,CH2Cl,CCl3,R^1C6H4(R^1isthegrouponthebenzeneringofaromaticcarboxylate),L=pyridine,CH3CN,DMF,havebeensynthesizedbytheligandsubstitu-tionreaction.Thedissociationoftheloosely-coordinatedligandLfromtheclustercorewasstudiedby^31pNMR.Thedissocia-tionprocessofLisrelatedtothesolvent,temperature,andacidityofcarboxylategroups,soastoaffectthesolutionstruc-tureandreactivepropertiesoftheduster.Thelong-distancein-teractionbetweenligandsRCO2andListransportedbyMo3S4core.

  • 标签: ^31P核磁共振 配体离解 Mo3S4(DTP)3(RCO2) 结构分析 配位化合物
  • 简介:三新混合器官/无机的聚合ligand交换chiral静止阶段被激进的链转移反应和表面grafting在硅石胶化上开发,并且成功地为dl氨基的酸和dl氢氧根酸的enantioseparations使用了。决定被使用包含2.0×的水完成10?是的CuAc2的4mol/L一个活动阶段,40°C的列温度,1.0mL/min和察觉在的流动率紫外254nm。在l异构体前的d异构体的elution顺序为除了dl职业人员,解决的所有dl氨基的酸被观察。

  • 标签: 手性固定相位 配位体 色谱分离法 羟基酸
  • 简介:Inthiswork,DSCandSEMstudiesindicatethation-ligandinteractioncanbeutilizedtoenhancetheinteractionofpoly(styrene-block-2-vinylpyridine)[P(S-b-2VP)]andpolyethylenebasedionomer(Surlyn).Thecompatibilityforthisblendingsystemcanbeimprovedbythisspecialinteractionand20/80wtistheoptimumblendingcompositionwithgoodcompatibility.FTIRresultsfurthercertifythatstronginteractionsexistintheblendingsystem.

  • 标签: 聚(苯乙烯-B-2-乙烯基嘧啶) 相容性 离子交联聚合物 离子配位键交互作用.
  • 简介:Thecreationandpropagationoflongitudinalacousticphonons(LAPs)inhighqualityhematitethinfilms(α-Fe2O3)epitaxiallygrownondifferentsubstrates(BaTiO3,SrTiO3,andLaAlO3)areinvestigatedusingthefemtosecondpump–probetechnique.Transientreflectionmeasurements(?R/R)indicatethephoto-excitedelectrondynamics,andtheinitialdecaylessthan1psandtheslowdecayof~500psareattributedtotheelectron-LOphononcouplingandelectron–holenonradiativerecombination,respectively.LAPsinα-Fe2O3filmcanbecreatedbyultrafastexcitationoftheligandfieldstate,suchastheligandfieldtransitionsunder800-nmexcitationaswellastheligandtometalcharge-transferwith400-nmexcitation.Thestrainmodulationsofthesoundvelocityandtheout-of-planeelasticpropertiesaredemonstratedinα-Fe2O3filmondifferentsubstrates.

  • 标签: 声学声子 赤铁矿 薄膜 位场转换 α-Fe2O3 电子动力学
  • 简介:LigandeffectofthecatalyticsystemWCl6-Et2AlClforringopeningmetathesispolymerization(ROMP)ofdicyclopentadiene(DCPD)wasinvestigated.Theexperimentalresultsshowthataddingstericallyhinderedphenol-2.6-di-tert-butylcresylol(DTBC)inthecatalyticsystemnotonlycanobviouslyincreasethemonomerconversionofpolymerizationbutalsoimprovethemechanicalproperties,suchasnotchedimpactstrength(NIS),tensilestrength(TS)ect.,ofthesynthesizedpolydicyclopentadiene(PDCPD),Asimilareffectcanbeobservedbyusingastericallyhinderdpolymericphenol-linearphenolformaldehyderesin(LPF)asaligand.

  • 标签: 二聚环戊二烯 聚合过程 催化系统 配位效应
  • 简介:TheL-proline-functionalizedpolystyrenewith1-methyldecylenespacerwassynthesizedfrom2%divinylbenzene-crosslinkedpolystyrenegelvia10-bromo-1-methyldecylpolystyreneintermediate.Aftercomplexedwithcopper(Ⅱ)ion,thepolymerwithL-prolineligandwasusedasthechiralstationaryphase(CSP)forligandexchangechromatographyofaminoacidracemates.TheresultsshowedthattheCSPpossessedpowerfulenantioselectivityandallracematesofthefifteentriedaminoacidswerecompletelyseparated.

  • 标签: 左旋-脯氨酸-职能化聚苯乙烯 手性固定相 1-甲基癸烯 色谱分离 氨基酸消旋体