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1.
TOwhomco ̄ndenCeshouldbeaddreSSedBothMSGLSandCDcontainhydronylgroupsonadjacentcanonatoms.IthasbeenknownthatpolyhydroxycompoundscanformironiccomplexeswithboraxIS].B}'addingboraxtothebuffercontainingor-CD,thesepboonofMSGLSti.asimproveddr ̄cally.asshowninFig.1.ImprovementofselectivitywaspresUmabl}.duetocomplexationoftheMSGLSwithboraxanda-CDinthesolution.OurobservationsshowedthattheconcentrationofboraxandthePHinthebaerarecriticalfactorsthechngtheresoluhonofMSGLS.DecreasingtheconcentrationOfboraxfrom100to50amoks.  相似文献   

2.
ThisinveshgationwassupportedbyTheNationalNaturalScienceFoundationofCllilla.geniusweret ̄ParentinUV,sothe2,4-etsand2,4tranS-isomerswereregardedasasingleconstituent(amixtUreof2-epimers)inanearlierreport.WesuccessfullyseattedisoaunonareticindiacetatestOtWoiSOmers,2,4ets-and2,4 ̄-isoannonareticindiacetatesbypreparativeTLCfromA.reticubo.OneOfthePair,2,4-ets-isoannonareticin,isanewnaturalproductandanother,2,4-tranS-isoannonarehcinisaknownbullatacinone.3ComPOundIwasobtainedcrystalline,mp.72-73"C.TheFAB-MSgavethePea  相似文献   

3.
戴立信  张聪 《化学进展》1999,19(2):214-216
1.论文名称OnPureAxialMonosubstitutedCyclohexanes2.发表刊物J.Am.Chem.Soc.,1998,120,12145.3.研究者BenCornet,MathewDavis,ShaoxiongWu,NeysaN...  相似文献   

4.
一类活性极高的高分子表面活性剂   总被引:11,自引:0,他引:11  
一类活性极高的高分子表面活性剂范仲勇,李娜,吴大诚(四川联合大学轻纺学院,成都,610065)ZhaohuiSu,S.L.Hsu(DepartmentofpolymerScience&Engineering,UniversityofMassachus...  相似文献   

5.
赵成大 《化学进展》1999,19(2):213-214
1.论文名称NoiseInducedPaternTransitionandSpatiotemporalStochasticResonance2.发表刊物Phys.Rev.Let.,1998,81(14),2854.3.研究者侯中怀杨灵法左孝兵辛厚文(...  相似文献   

6.
Syntheses,StructuresandPropertiesofSome NewCompositionPerovskiteCompounds:Sr_(0.6)Bi_(0.4)FeO_(2.7),Sr_(1-x)Bi_xFeO_(3-y) and Ba...  相似文献   

7.
TwoNewSterolsfromAdenophoraStenanthinaSubsp.XifengensisHOUZhen-fu,SHIYan-ping,MEIShuang-xiandLIYu*(InstituteofOrganicChemistr...  相似文献   

8.
氢化物发生原子荧光光谱法测定临床样品微量砷和硒   总被引:7,自引:0,他引:7  
研究了氢化物原子荧光法测定临床床样品全血,血清,胎盘,头发,指甲和尿液中微量As和Se的方法。线性范围为As1.3*10^-9-2.5*10^-7g/mL,Se2.8*10^10-7.5*10^-8g/mL;相对标准偏差(n=13)As2.6-3.6%,Se2.8-4.2%;As、Se的标准加入回收率为96.7-104.2%,用于6种临床样品中As、Se测定,获得满意的结果。  相似文献   

9.
STUDYONSYNTHESIS,CHARACTERIZATIONANDCATALYSISOFPILLAREDANIONCLAY(Ⅲ)──SYNTHESISOFZnAl-BW_(11)O_(39)Z(H_2)~(n-)ThanksforthesupportofFoundationofCECandtheopenlabofHydrothermalSynthesisinJinnUniversityeddifferentkindsoftriheteropolyoxometalate(TH'POMs)totheZnAIlayeredclays,usingtheesterificationofn-butylalcoholandaceticacidasprobereaction.andfoundthatthepillaredcompoundsweremoreactiveandselectivethanthesolidacidcatalystssuchasacidicion-exchangeresinsl4].Onthebasisofpreviouswork.wenowencapsulatetriheteropolyoxome  相似文献   

10.
化学文摘社和国际科技信息检索网   总被引:1,自引:0,他引:1  
化学文摘社和国际科技信息检索网张立群(美国化学文摘社,ChemicalAbstractsService,P.O.Box3012.ColumbusOH43210,USA)张曼平(青岛海洋大学化学系,266003)从1907年建立以来,化学文摘社(CAS...  相似文献   

11.
TNSTRUCTTONS TO CONTRIBUTORSt.CCLisamonthlyjournal,publishedbytheChinesechemicalSociety.CCLwillpublishpreliminaryacccuntsinth...  相似文献   

12.
TNSTRUCTTONS TO CONTRIBUTORS¥//t.CCLisamonthlyJournal,publisheoytheChineseChemicalSociety.CCLwillpuulishpreliminaryacccumtsin...  相似文献   

13.
STUDIESONTHESYNTHESISOFSESAMIN-GROUPLIGNANSV.ACONVENIENTMETHODFORTHEPREPARATIONOF2-ARYL-4-PHENYLOXAZOLES¥Correspondentauthor.2-aryl-4-phenyloxazoles.Theotherollebythereactionofa-methylphenacylbenzoatewithammoniumacetateinboilingaceticacidtoformafutureof2,4-diphenyl-5methyloxazoleand2,4-diphenyl-5-rnethylinddazolebothinabout40%yield,hilttillsmethodisapplicableforthepreparationof2-aryl-4-phenyloxazoles.Byanalogy,plienacylbenzoateisalloallowedtoreactwithalnmonillmacetateinboilingaceticacid.Amixtureof2,4-diph  相似文献   

14.
ADDITIVEEFFECTONTHEMICELLE-CATALTICHYDROLYSISOFCARBOXYLICACIDESTERSkWandho:rateconstantsforsolutionsfithandfithoutCTAB(0.00438moldin-.).FIg.Ikegvs.COT ̄nforNPPinFig.2EffectofNH3-bufferuponNaZCO.-NaHCO3buffersolutionthehydrolysisrateOfNPPTIpaqueoussnintinnof0.00438mo1din--3CTABwasusedasthemlcelIarsoIl]tIonbecauseitisthesitIuti(InofoptimumcatalyiIceffectintheNaZCOg-NaHCO3buffer,asshowninFig.1.Forthesameester.NPP,k.1<k..andPH,repHZwlo,andkoZ=Ko3butPH:>pll..Theseun-reasonableresulismaybedlletotheslmlJItaneousam  相似文献   

15.
AlotofTi-substitutedmolecularsieveshavebeendevelopedsincethesynthesisofTS-1anditsuniquecatalyticpropertywasreported.TS-1,thet...  相似文献   

16.
StudiesontheBindingofTris(1,10-phenanthroline)Nickel(Ⅱ)toCalfThymusDNAJINLan,YANGPin..andLIQing-shan(StateKeyLaboratoryofCoor...  相似文献   

17.
林建华 《化学进展》1999,11(3):335-336
1.论文名称SolvothermalCo-reductionRoutetotheNanocrystalineⅢ—ⅤSemiconductorInAs2.发表刊物J.Am.Chem.Soc.,1997,119,7869.3.研究者李亚栋*段镶峰钱逸泰*...  相似文献   

18.
用石墨炉原子吸收法测定水质中微量砷,硒的探讨   总被引:4,自引:0,他引:4  
采用石墨炉原子吸收法测定水中微量砷,硒,经大量实验条件摸索,选择不同仪器分析工作条件,找出了最佳升温程序条件,特别是原子化时气流控制,使分析方法的检出限降低为:As0.6μg/L,Se0.5μg/L。线性范围;As0.000-0.120mg/L,Se0.000-0.024mg/L;精密度,相对标准偏差分别为:As1.26%,3.67%,Se2.56%,4.57%,回收率为:As98.0%-110.  相似文献   

19.
StructureStudiesonNewTypesofMacrocyclicCompoundsPartV.CrystalStructureofNickel(II)Complexof5,12-Diphenyl-7,14-dimethyl-1,4,8,...  相似文献   

20.
农晋琦  蔡端仁  欧阳政 《色谱》1994,12(1):28-31
 将硒半胱氨酸(SeCysH)甲基化,对硒胱氨酸(SeCys)需还原后再甲基化。它们生成的甲基硒半胱氨酸(CH_3SeCysH)能与溴化氰(CNBr)发生专一性反应,定量生成的硒氰酸甲酯(CH_3SeN)可用气相色谱法(GC)测定。此法简称CNBr-GC法,检测限4×10 ̄(-8)克SeCys,准确度89.5%,相对标准差12.1%,非含硒氨基酸不干扰。此法适于样品中微量硒氨基酸(硒蛋氨酸SeMet,SeCysH和Secys)的测定。  相似文献   

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