简介：包括的有效策略弄短，链扩展，积极的组介绍和同类的反应战术，被采用与纤维素醋酸盐(CA)修改多围的碳nanotubes(MWNT)。由利用2,4,6-trichloro-1,3,5-triazine，特殊，MWNT(MWNT-triazine)的反应中介被获得。MWNT-triazine的合适的溶解度帮助让同类的修正成为现实。在在MWNT-triazine和氢氧根的氯化物原子之间的那反应在CA组织的进一步验证的详细描述贡献了MWNT-CA的形成结合。新奇MWNT-CA由碳(76.3%)组成，氧(18.4%)和氮(5.3%)。与42.8wt%的一个依附nanotube的CA内容，MWNT-CA在DMSO，NMP，DMF和DMAc是容易地可溶的。CA-based修正线路的证实可能导致为特定的吸着和隔离瞄准的研究。

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简介：Themechanismofesterhydrolysishasbeenextensivelystudied;however,theprecisefunctionofactive-siteresiduesinpromotingcatalysisisunclear.WedescribeherethestructuralmodelsforthecomplexofacatalyticantibodyFvfragmentwithaphosphonatetransition-stateanalogue,constructedbyusinggenecloning,sequencingandmolecularmodeling,mainlybasedonaknownX-raystructureofacatalyticantibody.HydrophobicandelectrostaticanalysesoftheFv/analogandFv/substrateinteractionsuggestthehydrolysismechanism:TyrL91andTyrH97playimportantrolestostabilizetheβ-naphthylgroupofhaptenthroughπ-stack;HisH35donatesapairoffreeelectronsattheatomNE2toanactivewaterandletittobeapartialhydroxide,whichattacksthecarbonatomofthecarbonylgroupofthesubstrate.BothHisH35andArgL96canformhydrogenbondsandstabilizetheanionictetrahedralintermediateformedduringturnover.Thismechanismemphasizesthatanactivewaterbridgemaybeformedduringhydrolysisprocess.

简介：Thereactivityratiosofthetrinarysystemoftriallylisocyanurate,divinylbenzeneandvinylacetatewrerecalculatedfromtheQandevaluesdeterminedbyotherinvestigators.Accordingtotheseratios,theterpolymerizationofthesemonomerswaspredictedpossibleandthepolymerizationwascarriedoutbysuspensionpolymerizationwithtolueneandgasolineasextenders,formingsphericalmacroporousterpolymers.Theinfluencesoftheamountoftheextendersandthecrosslinkingdegreeontheporepropertitieswerestudied.Theresultshowedthatunderadequatereactionconditions,thispolymerizationsystemcouldproducemacroporouscopolymerswithveryhighsurfacearea(>1000m^2/g)whichhaveneverbeenobtainedinotherpolymerizationsystemusingsilimarpolymerizationtechnique.Thiswasmostprobablycausedbytheformationofsomelinearorbranchedpoly(vinylacetate)duringthepolymerizationprocessbecauseofthepoorcopolymerizingabilityofvinylacetate.Thislinearorbranchedpolymeractedasanextenderandformedatrinaryporeporducingreagentwithtolueneandgasoline.

简介：在这个工作，chitosan/cellulose醋酸盐microspheres(CCAM)被W/O/W乳剂的方法没有有毒的试剂准备。microspheres是球形的，免费流动，并且非聚集，它有狭窄的尺寸分布。超过90%microspheres有直径从200～280m。hemolytic分析显示CCAM是安全的并且没有hemolytic效果。植入的CCAM没在Sprague-Dawley(SD)老鼠的血液学生产任何重要变化，例如血红素的白血房间，红血房间，血小板，和体积。另外，浆液丙氨酸aminotransferase，血脲氮，和creatinine的层次没在没有任何培植，与CCAM，surger线，或正常SD老鼠植入的SD老鼠有明显的变化。因此，CCAM有好血相容性并且没有hepatotoxicity或肾的毒性到SD老鼠。而且，CCAM与或没有模型药在SD老鼠关于煽动性的反应有好织物相容性并且没从与外科线植入的SD老鼠的显示出重要差别。CCAM表演作为一个长行动的交货系统答应，它有好biocompatibility和biodegradability。

简介：Twokindsofrhodiumcatalystssupportedoncross-linkedstyrene-divinylbenzenecopolymerscontainingbipyridineoro-phenylenediaminehavebeenpreparedandfoundtodisplayhighactivityformethylacetatecarbonylationtoformaceticanhydride,theactivitiesareevenhigherthantheirhomogeneouscounterparts.XPSanalysiswasusedtocharacterizethesyntheticcatalysts.TheapparentactivationparametersweredeterminedtobeEα=73.3KJ/mol,ΔH^≠=66.3KJ/mol,ΔS^≠=-28.6eu.Theseparametersareveryclosetothoseinmethanolcarbonylationandimplytohaveanalogousmechanisminbothcases.

简介：Theeffectofvinylacetate(VA)contentinethylenevinylacetate(EVA)copolymeronthemechanicalpropertiesofpolypropylenewasinvestigated.ThreedifferentEVAcopolymerswithconcentrationsof3wt%,6wt%,9wt%,12wt%and15wt%,wereblendedtopolypropylene.Themechanicalpropertiessuchasyieldandtensilestrengths,elasticmodulus,Izodimpactstrength,hardnessandmeltflowindexoftheblendswereinvestigated.Relationshipbetweentypeofvinylacetateandconcentrations,mechanical,MFIandmorphologicalpropertieswereexplored.

简介：Inthisstudy,emulsion-solventevaporationmethodwasappliedtopreparethecelluloseacetate(CA)aqueousdispersion.Upontheanalyzingofthecharacteroftheaqueousdispersion,acontrolledreleaseformulationofsalbutamolsulfatecoatedwithcelluloseacetateaqueousdispersionwaspreparedthroughorthogonalexperimentdesign.Thefactorsthatcontrolthedrugreleasecharacterofthetabletswereinvestigated.Thedrugreleasemechanismoftheformulationwasalsostudied.TheexperimentalresultsindicatedthatCAaqueousdispersionhadexcellentfilm-formingabilityundertheeffectofplasticizer.ThedrugreleaseprofileofthecontrolledreleasetabletscoatedwithCAaqueousdispersionexhibitedzero-orderreleasecharacterandthedrugreleaseratewasmodulatedbytheosmoticpressureofthedissolutionmedium.

简介：AbstractObjective:The aim of this work was to measure the antibacterial activity (against Escherichia coli and Staphylococcus aureus [S. aureus]) of the ethyl acetate part of Abrus cantoniensis and assess their potential as medicines.Methods:The experiment was divided into four groups: negative control group [with Mueller-Hinton broth (MHB)], positive control group (with 75% ethanol), blank group (with MHB) and test group (with the ethyl acetate part of Abrus cantoniensis). The antibacterial activities of the extracts were evaluated by the Oxford cup assay and minimum inhibitory concentration (MIC). Time-kill curve experiments, scanning electron microscopy, the content of DNA, RNA and protein were used to study the antibacterial mechanism of the ethyl acetate extract part on the growth and viability of S. aureus. The study procedures were approved by the Animal Care and Use Committee of Xi’an Jiaotong University (approval No. XJTULAC2016-412) on January 22, 2016.Results:The ethyl acetate part of Abrus cantoniensis extract exhibited the highest inhibitory activity against the growth of S. aureus with an inhibition zone diameter of 16.4 mm and MIC value of 0.5 μg/mL. The general activity range of the ethyl acetate part, determined using a time-killing curve, was found to be 0.5 μg/mL to 40 μg/mL (MIC to 80 × MIC). Changes in the scanning electron microscopy images and of DNA, RNA and proteins of S. aureus indicated possible mechanisms of the inhibitory activity of the ethyl acetate part.Conclusion:The ethyl acetate part of Abrus cantoniensis damaged bacterial cell structures, which results in protoplasm leakage, and eventually bacterial cell death.

简介：Silicawasused,asacatalystcarrier,toloadceroussulfateforcatalyzingthesynthesisofn-butylacetate.Themainpurposeofthisresearchwastoexplorethefeasibilityofsilicainimprovingthedecentralityandactivityofthecatalyst.Theeffectsofmolarratioofbutylalcoholtoaceticacid,theceroussulfateloadingsandthereactiontimeontheconversionofaceticacidwerestudiedbysinglefactorexperimentmethodandorthogonalexperimentmethodrespectively.Therefractiveindex(n20D)andmolecularstructureofthepreparedn-butylacetateweremeasuredbyAbbeRaefractometerandFourierTransformInfraredspectroscope,respectively.Thecomparisonsofthesilicaloadedandunloadedcatalystsforcatalyzingthesynthesisofn-butylacetateweremade.Theresultsshowedthatthesuitableconditionsforsynthesizingn-butylacetatewere:molarratioofbutylalcoholtoaceticacidof1.4∶1,uselevelofloadedceroussulfateof0.30gandreactiontimeof50min,respectively.Themaximumconversionofaceticacidforthesilicaloadedcatalystreached98.62%whichwas12.32%and16.43%higherthanthosefortheunloadedcatalystsreportedinliteratures,buttheuselevelofceroussulfatefortheformerwasmuchlessthanthoseforthelattersundersimilaroptimaltechnicalconditions.Thesilicawasprovedtobeagoodcatalystcarrierforenhancingdecentralityandactivityofthecatalystandincreasingtheconversionofaceticacid.Therepentanceofthesilicaloadedceroussulfatewasalsoinvestigatedintheexperiment.

简介：Monophasic多铝红柱石(3Al2O3潲敧?楮正汥牦敥愠獵整楮楴?瑳楡汮獥?瑳敥?畤楲杮愠湮慥楬杮

简介：Associationbehaviorofethylenevinylacetate（EVA）copolymerinfoursolvents1,2-dichloroethane（DCE）,cyclohexane（CYH）,xylene（XYL）andchloroform（CF）hasbeeninvestigatedbydilutesolutionviscometryThecriticalassociationconcen-tration（CA）wasdeterminedatwhichtheincipientdecreaseinslopeoftheηsp/C～Ccurveinsolutionsatthediluteregime.OurresultsshowedthatwhethertheCAcouldexistdependsonsolventproperty.ThevaluesofCAinDCEincreasewithincreasing,oftemperatureandvinylacetate（VA）contentinEVAanddecreasingofmolecularweightofEVA.

简介：Inordertoseparatemethylacetateandmethanolazeotrope,theionicliquid(IL)1,3-dimethylimidazoliumdimethylphosphate([DMIM]DMP)wasusedasthesolvent.TheAspenPlussoftwarewasusedtodesignandoptimizetheextractivedistillationprocess.Undertheoptimizedconditions,themassfractionsofmethylacetateandmethanolwerebothabove99.5%.Comparedwiththedimethylsulfoxide(DMSO)process,the[DMIM]DMPprocesshastheadvantagesofsavingenergyandlowerequipmentinvestmentcost.Theresultshowsthatusing[DMIM]DMPasthesolventtoseparateamethylacetateandmethanolazeotropehasbetterprospectinindustrialapplication.

简介：Topreventexpandedpolystyrene(EPS)beadsfromrisinguptothesurfaceinthemoldingprocessofEPSlightweightconcrete,vibrationwithpressurewasappliedandthepolyvinylacetate(PVA)emulsionwasadoptedtoimproveitsmechanicalproperties.Themechanicalproperties,thermalpropertiesanddurabilityofEPSlightweightconcreteweretested.ThemicrostructuresofEPSlightweightconcretewereobservedbyscanningelectronmicroscope(SEM).Vibrationwithpressurereducesthenumberofsmallcracks.The180dcompressivestrengthandflexuralstrengthincreaseobviouslyasalargeamountofPVAwasadded.ThemixedamountofPVAhasnoobviousinfluenceonthethermalperformancewhenitisnotmorethan10%ofthecement.VibrationwithpressureandsurfacemodificationofEPSbeadsbyPVAimprovethecombinationofEPSbeadswithcementstoneandthemechanicalpropertiesofEPSlightweightconcrete.

简介：ThelargestinwesternYunnanChemicalprojects—the200kt/acalciumcarbideprojectandthe50kt/avinylacetateproject—willbeofficiallyconstructedinBaoshancitybytheYunweiCompanyunderYunnanCoalChemicalGroup.InSeptember2007theBaoshanmunicipalgovernmenthadsignedastrategiccooperationagreementwiththeYunnanCoalChemicalGrouponutilizingtherichmineralresources,hydropowerandcoalresourcestoenergetically

简介：Themasterdesignof300kt/avinylacetateunitattheSichuanVinylonPlanthaspassedreview,andconstructionofthisunitwillbekickedoffsoon.ThisprojectisakeyassociatedprojectenvisagedbytheprojectfortransmissionofSichuangastoEasternChina,anditsfeasibilitystudyreporthasbeenapprovedfollowingtheenvironmentassessmentconductedbytheStateBureau

简介：OnApril11,2011thecommercialscaleapplicationtestoftheCTV-VItypecatalystdevelopedbytheSINOPECShanghaiPetrochemicalResearchInstitute(SPRI)wasconductedattheNo.2vinylacetateunitoftheShanghaiPetrochemicalCompany,withthestartupoftheprocessunitrealizedsuccessfullyatthefirstattempt.Theproposal

简介：背景对于有症状的子宫肌瘤，手术前给予醋酸乌利司他（ulipristalacetate）与醋酸亮丙瑞林等相比，其治疗疗效和副作用情况尚不清楚。方法研究者采用双盲非劣效性试验，将307例有瘟状的子宫肌瘤和子宫出血过多的患者随机分配入接受为期3个月每日口服醋酸乌利司他（剂量为5mg或10mg）的治疗组或者每月1次肌肉注射醋酸亮丙瑞林（剂量为3．75mg）的治疗组。主要研究目标为评估在第13周时子宫出血已控制的患者比例。

简介：Thenewprocessforcatalyticrectification/hydrolysisofmethylacetatedevelopedbytheChemistryandChemicalEngineeringCollegeofFuzhouUniversityhasbeendissemi-natedandapplied.Thisprocessadoptsthenewintegratedtechnologyofcatalyticrectificationwhichnotonlyhastack-ledtheproblemoflowrateofhydrolysisofmethylacetateobtainedinthecourseofPVAmanufacture,butisalsobe-

简介：Inthispaper,blendmembranesfrompolyvinylacetate(PVAc)andblockcopolymerpoly(amide-12-b-ethyleneoxide)(Pebax1074)arepreparedbysolutioncastingandsolventevaporationmethod.Althoughtheyarehomogeneousonamacro-scale,theobservationsfromDSCandSEMindicatemicro-phaseseparationforPVAc/Pebax1074blendmembranes.WiththeincreaseofPebax1074content,gaspermeabilitiesofCO2,H2,N2andCH4allincreasegreatly.PVAc/Pebax1074blendmembraneswithhighPVAccontentareappropriateforCO2/CH4separation.Thetemperaturedependenceofgaspermeabilityisdividedintorubberyregionandglassyregion.Theactivationenergiesofpermeationinrubberyregionaresmallerthanthoseinglassyregion,andtheyalldecreasewithincreasingPebax1074content.ForN2,H2andCH4,theirgaspermeationpropertiesaremainlyinfluencedbythedual-modesorptionandhydrostaticpressureeffect.ButforCO2,itspermeabilityincreaseswiththeincreaseofpressureduetoCO2-inducedplasticizationeffect,whichismoreobviousforPVAc/Pebax1074blendmembraneswithhighPVAccontent.