简介：PotentialenergysurfaceofHNOSsystemisinvestigatedbymeansofMP2methodwith6-311++G(d,p)basisset.TheenergyforeachminimumandsaddlepointonthepotentialenergysurfaceiscorrectedattheQCISD(T)/6-311++G(3df,2p)leveloftheorywithzero-pointvibrationalenergyincluded.Asaresult,eighteenisomersaretheoreticallypredictedandcis-HNSOisfoundtobeglobalminimumonthepotentialenergysurface,Wherein,fourteenisomersareconsideredaskineticallystablespecies,andshouldbeexperimentallyobserved.ComparisonsaremadeforHNOSsystemwithitsanalogues,HNO2andNHS2.Thenatureofbondingandisomers'stabilityofHNOSsystemaresimilartoHNS2.TheobvioussimilaritiesanddiscrepanciesamongHNOS,HNO2andHNS2areattributedtothehypervalentcapacityofsulfur,oxygenandnitrogenatoms.

简介：ThethermalstabilityofNewZealandculturerabbitmusclealdolasewasinvestigatedbydifferentialscanningcalorimetryinthewatercontentrange0.23-3.70gwaterpergprotein.Theexperimentalresultsshowedthatatwatercontentsbelow0.47g/g,anendothermicpeakwasobservedandatwatercontentsabove0.57g/g,anendothermicandanexothermicpeakwerebothobservedonDSCthermogram.Thermaldenaturationresultoftheenzymeandtherelationshipbetweentwotransitiontemperaturesandwatercontentswerefirstreportedinthispaper.Uptonowwehavenotseenanysimilarreportsconcerningtheexothermictransition.

简介：ThestabilityconstantsofthebinarycomplexesofMn2+withnicotinamide(NA)weredeterminedfrompotentiometricpHtitrationsdataat15.0,25.0and35.0oCandI=0.1,0.2,0.4molL-1(NaClO4).Theformationofbinary1:1,1:2NA-Mncomplexesatthreedifferenttemperaturesandtheinfluenceofthreedifferentionicstrengthontheirstabilitywerereported.Thethermodynamicparameters(△Gof,△Sof,△Hof)forthecomplexformationreactionwereestimatedfromstabilityconstantatdifferenttemperatures.

简介：三倍的螺旋状的结构的热稳定性在骨胶原生合成，功能和降级起一个关键作用。CD技术被利用描绘合成骨胶原的热稳定性模仿肽。因为它的便宜乐器学，低操作费用，容易的操作，和高敏感，荧光光谱学广泛地全世界与容易的存取被使用。这里，我们开发了一个其他的荧光方法检测骨胶原的热稳定性模仿肽。我们证明了那荧光光谱学能测量骨胶原的热稳定性在不同情形下面与低集中模仿肽。自我熄灭的试金将极大地帮助的这高度敏感的荧光骨胶原的性质模仿的顺序依赖者的研究肽，和它在决定象骨胶原，collectins，adiponectin，巨噬细胞scavenger和C1q那样的三倍的螺旋系统的热稳定性的应用程序有大潜力。

简介：

简介：Hydrotalcitecanactasaco-stabilizerwithothermainstabilizerforpoly(vinylchloride)(PVC).ThethermalstabilityandfluidpropertyofPVCfilledwithhydrotalcitesurface-treatedwithtitanateandsilanewerestudiedinthiswork.OrganicSnisamainstabilizerandhydrotalciteisastabilizingassistant.ThestabilityofthePVCresinmixedwithorganicSnandhydrotalciteisbetterthanthatofthePVCresinmixedwithorganicSnalone.ItisshownthatthePVCresinfilledwithhydrotalcitepossessesabetterstaticanddynamicheatstability.Moreover,hydrotalcitecanimprovethefluidpropertyofPVC,whichisadvantageoustotheprocessingofPVC,andtheoptimumcontentofhydrotalciteisabout1%-2%(massfraction).

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＡｖａｒｉｅｔｙｏｆｎｅｗｐｏｌｙａｍｉｎｏｐｏｌｙｃａｒｂｏｘｙｌａｔｅｌｉｇａｎｄｓａｎｄｔｈｅｉｒｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄｉｎｒｅｃｅｎｔｙｅａｒｓｂｅｃａｕｓｅｏｆｔ...

简介：

简介：

简介：Whenaproteinisencapsulatedintopoly(DL-lactide-co-glycolide)(PLGA)microspheresbymeansofthedouble-emulsionmethod,theharshmicrospheresformationprocessincludingultrasonification,exposuretoanorganicsolventandapolymermaycausethedenaturationoftheprotein.Inthisstudy,weinvestigatedtheenzymaticactivitychangeandtheeffectoftheexcipientsonthestabilityofrecombinanthumanCu,Zn-superoxidedismutase(rhCu,Zn-SOD)duringtheemulsification.ThespecificactivityrecoverywasfoundtobeconcentrationdependentandtheexcipientsinvolvedsuchasPEG600andTween20,andtrehalosewereshowntoincreasethestabilityofrhCu,Zn-SOD.TheproteinstructuralintegritywithinthemicrosphereswasanalyzedbyFTIR.ThestructureofrhCu,Zn-SODwithinPLGAmicrospherescontainingtrehalosewasfoundtobesimilartothatofthenativesolidstate,whereastheproteinencapsulatedduringthepreparationintheabsenceofanyexcipientchangedduetothepossiblehydrophobicinteractionwiththepolymer.Theresultssuggestthatarationalstabilitystrategyforproteintobeencapsulatedintomicrospheresshouldaimatdifferentprocesses.

简介：Thepolyoxometalate-imidazoleionicliquids(POM-ILs)withlowmeltingpointsat94.5and95.5°C,[Cnmim]4[Mo8O26](Cnmim=1-alkyl-3-methylimidazolium,n=12,14),havebeensuccessfullysynthesizedandcharacterizedbyDSC,single-crystalX-raydiffractionandTGA,etc.ThetwoPOM-ILshaverelativelyhighstabilitywithdecomposingtemperatureuptoabout347and344°C,respectively.FurtherphotocatalyticperformancewasmeasuredviathedegradationofrhodamineB(RB)inaqueoussolution.Theexperimentsshowthattheconversionreachedto90%after90minunderUV-lightandthedegradationefficiencydependedonpHvalue,differentdosagesandsoon.Inaddition,thecatalystscanberecycledforseveraltimeswithoutsignificantlossofactivity.

简介：

简介：Theconformationofpolymersatthesolid-liquidinterfacehasbeenthesubjectofconsiderableinterestinthefundamentaltheoryandappliedpractice.Inpaintsandprintinginks,dispersionsofpigmentorfillerpowdersinpolymericbindersolutionshavetobemaintainedinthecolloidalstate.Oneofthestabilizingmechanismsforpaintisthestericstabilization.Ontheotherhand,intheformationreactionofpolymeratthesolid-liquidinterfacetookplacebetweenmonomersolutionsandsolid

简介：Metamizolesodiumwaschosenasarepresentativeofunstableanalytesforinvestigationbydiscussingtheeffectsofoxygenandsolventonitsdegradationreactionusingthecapillaryelectrophoresistechnique.Apossibledegradationmechanismwasdeducedfromtheobservedbehaviorandwasconfirmedbyinfra-redspectroscopicstudy.Thedegradationreactioncouldbeinhibitedobviouslybymethanolinsteadofwaterasthesolventofanalyte.Undertheoptimizedconditions:separationvoltageof20kV,and5mmol/Ldisodiumhydrogenphosphateand5mmol/Lboraxwith10%methanol(pH9.12)astherunningbuffer,thestandardcurveofmetamizolesodiumwaslinearinarangeof3.77—74.07mg/L.Asatisfactoryresultwasachievedwhenthetechniquewasusedtodetectmetamizolesodiumintablet.

简介：TheternaryCu(Ⅱ）complexwith2,2′-bipyridyl(bipy)andL-methioninte(L-Met)hasbeensynthesizedandcharacterizedbyelementalanalysis,molarconductivity,UV-Visspectra,IRspectraandpH-potentiometrictitrationmethods.Thestructureofthecomplex[Cu(L-Met)(bipy)(H2O)]ClO4·3/8H2OwascharacterizedbytheX-raydiffractionanalysis.Itcrystallizesinthetriclinicsystem,spacegroupP1withfourmoleculesinaunitcellofdimensions,a=0.7656(2)nm,b=1.3142(3)nm,c=2.0596(4)nm,α=97.70(3)°,β=97.96(3)°,γ=94.33(3)°，V=2.0244(8)nm^3,R1=0.0441andwR2=0.0678,Thecrystalcontainsfourcrystallographicallyindependent[Cu(L-Met)(bipy)(H2O)]^+complexes(Cu1-Cu4),havingadistortedsquare-pyramidalgeometrywiththesamecoordinatedatomsaroundeachcoppercenter.Thebaseplaneisoccupiedbytwonitrogenatomsofonebipy,theaminonitrogenatomandonecarboxylateoxygenatomfromeachindependentL-Metmoiety,andonewateroxygenatanaxialposition.CulandCu3areessentiallyenantiomersofCu2andCu4.Thefourmoleculesarepackedwitheachotherbyintermolecularhydrogen-bondingandaromatic-ringstackinginteractions.

简介：

简介：Li4Ti5O12（LTO）/carbonnanotubes（CNTs）compositematerialissynthesizedbasedonasolid-statemethodbysand-milling,spray-dryingandcalciningat8508CunderN2flow.TheLTO/CNTssampleswith1wt%and3wt%weightratioofCNTsadditionandthepristineLTOsampleareprepared.TherateperformanceandthethermalstabilityofthesesamplesareinvestigatedbasedonLiMn2O4（LMO）/LTOfull-cell.TheresultsshowthattheweightratioofCNTsadditionhasdistincteffectonLTOperformances.ThecompositematerialsofLTOcompositedCNTshavebetterperformanceathigh-rateduetotheintercalationenhancementbyconductivenetworkofCNTs.Atsecond,theoverchargingtemperatureresponseofthecell’ssurfacewith1wt%CNTsadditionisthelowest.Theparticlesizedistributionismeasuredandthemostuniformparticlesareobtainedwith1wt%CNTsaddition.ThistrendcouldexplainthatthemediumquantityofCNTsisoptimaltoimprovetheheatandmasstransferandpreventtheproblemsofcrystallitegrowinginterferenceandaggregationduringthecalcinationprocess.