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简介：Syntheticgoethite(α-FeOOH)waspreparedinthelaboratoryusingamodifiedversionofBrauer’smethod.Theprocessofsteam-crystallizationwasprolongedandimpuritieswereremovedbydialysis.TheproductshavebeencharacterisedbySurfaceAreaAnalyserandScanningElectronMicroscope,andprovedtohavelargerSpecificSurfaceAreathanthatinliterature.

简介：TheroleplayedbyDNAinmolecularbiologyisclearlyrecognizedtobevitaltolifeonthisplanet.8-oxo-7,8-dihydro-2deoxyguanosine(=8-OHdG),isprobablythemostimportantproductof"oxidativestress”inDNA.ItsconcentrationinDNAis,infact.aquantitativeanalysisofthedegreeofDNAdamagethatanorganismhasundergone.Duetotheimportanceof8-OHdGofnucleicacidginmutagenesis,carcinogenesisandaging,numerouschemicalandbiologicalinvestigationshavebeenmadeonthissubjectinthepasttime.Kuchinoandco-workershavefoundthat8-OHdGresidueinDNAismisreadingduringtheprocessofDNAreplication.Recently,somereportshavebeenpresentedonhigh8-OHdGlevelsinpatientssufferingfromvariousdiseasessuchaschronichepatitis,Fanconisanemia,diabetesmellitusandHelicobacterpyloriinfections.Asaresult,8-OHdGisausefulmarkerforthestudyofDNAdamagearisingfromreactiveoxygenspeciesandisofgreatsignificanceforcancerresearch.The8-OHdGlevelsinDNAcanhelpunderstandthemechanismofcarcinogensandleadtomoreeffectivetreatmentsformanydifferenttypesofcancer.Forthesereasons,ananalysisof8-OHdGwithquickness,lowcostandhighaccuracyisrequired.

简介：ＡＮｅｗＭｅｔｈｏｄｆｏｒＳｃｒｅｅｎｉｎｇＩｍｍｕｎｅＤｒｕｇｓｂｙＬｉｎｅａｒＳｗｅｅｐＰｏｌａｒｏｇｒａｐｈｙＡＮｅｗＭｅｔｈｏｄｆｏｒＳｃｒｅｅｎｉｎｇＩｍｍｕｎｅＤｒｕｇｓｂｙＬｉｎｅａｒＳｗｅｅｐＰｏｌａｒｏｇｒａｐｈｙ￥ＸｉａｏＦｅｎｇ...

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简介：CyclicvoltammetryandchronoamperometrywereusedtoinvestigatetheclectrochemicalbehaviorofFe(Ⅱ)andEr(Ⅲ)inaLiClO4-DMSO(dimethylsufoxide)systematPtandCuelectrodes.ExperimentalresultsindicatethatthereductionsofFe(Ⅱ)toFe(0)andEr(Ⅲ)toEr(0)wereirreversibleatPtandCuelectrodes.ThediffusioncoefficientandtheclectrontransfercoeffieientofFe(Ⅱ)ina0.01mol/LFeCl2-0.1mol/LLiClO4-DMSOsystemat303Kwere1.70×10^-10m^2/sand0.08respectively,thediffusioncoeffieientandtheelectrontransfercoefficientofEr(Ⅲ)ina0.01mol/LErCl3-0.1mol/LLiClO4-DMSOsystemat303Kwere1.47×10^-10m^2/sand0.108respectivealy.Thehomogeneous,strongadhesiveEr-FealloyfilmscontainingErof31.39%-42.12%inmassfractionwithmetalliclustrewerepreparedbypotentiostaticelectrolysisonaCuelectrodeinaErCl3-FeCl2-LiClO4-DMSOsystemat-1.75—-2.05V(vs.SCE).

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简介：Three-componentIPNsweresynthesizedfrompolyurethane/poly(methylacrylateaminoethylmethacrylate)/epoxyresin[PU/P(MADMA)/EP]bysimultaneoussynthesisinterpenetratingpolymernetworksmethod(SINs)andsequentialsynthesisinterpenetratingpolymernetworksmethod(STPNs).Comparingtheeffectofthetwosynthesismethodsonthemorphologyandmechanicalpropertiesofthree-componentIPNs,itwasfoundthatthecompatibilityofthree-componentIPNsdependsonthecomponentratiosandinterpenetratingformation,thedifferentsynthesismethodsmaketheentanglementandinterpenetratingbetweennetworkschanged.ThetensilestrengthofSIPNsisbiggerthanthatofSINs,whiletheelongationatbreakofSINsisbiggerthanthatofSIPNs.Itisfeasibletousestepwisestainingmethodtoobservethemorphologychange.

简介：为从经由1,3-dimethylbenzimidazolium盐的相应的羧基的酸的脂肪族的醛的准备的一个新奇合成方法被提供。1,3-Dimethylbenzimidazolium盐很快与钠/乙醇然后hydrolyzed被减少与盐酸获得脂肪族的醛，1,3-dimethylbenzimidazolium在腌的酸能乐意地从相应的羧基的酸被完成。为有钠/乙醇的1,3-dimethylbenzimidazolium盐的减少的反应的机制被讨论。

简介：Copper-dopedZnOnanoparticlesweresynthesizedbythesol-gelmethod.TheX-raydiffraction(XRD)resultshowsthatZn1-xCuxO(x≤0.04)samplesaresinglephasewithZnO-likewurtzitestructure,whilethesecondaryphaseCuisobservedinaZn0.95Cu0.05Osample.MagneticmeasurementsindicatethatZn1-xCuxO(x≤0.04)samplesareferromagneticatroomtemperature.Astronggreenpeak(520nm)wasobservedexceptforUVbandpeakinphotoluminescent(PL)spectrumofZn0.98Cu0.02O.

简介：tert-Butyl(R)-3-amino-3-(3-fluorophenyl)propanoate(5)waspreparedwithconventionaldebenzylationmethod.However,thetert-butyl(R)-3-[(S)-1-phenylethyl-amino]-3-(3-fluorophenyl)propanoate(6)andtert-butyl(R)-3-amino-3-phenylpropanoate(7)weregeneratedasthebyproductsunderthegeneralcatalytichydrogenationPd(OH)2/C-H2conditions.Soaseriesofexperimentswasperformedtooptimizethereactionconditionssothatproduct5couldbeobtainedwithhighpurityandyield.Finallyaneffectivecatalyticsystem,Pd/C-HCOOH-CH3OH,wasdiscovered.

简介：Thecriterionoforientatinggroupofelectrophilicaromaticnitrationwasdiscussedbymeansofpatternrecognitionmethodwithquantum-chemicalparametersasfeatures,andtheproductratiosofthereactionswerequantitativelycalculatedusingartificialneuralnetwork(ANN)methodwiththesameparametersasinputs,basedontheabinitiocalculationofquantumchemistry.Thequantum-chemicalparametersinvolvedorbitalenergy,orbitalelectronpopulation,atomictotalelectrondensityandatomicnetcharge.Thepredictedvaluesareinagreementwithexperimentalresultsand(hepredictederroroftheANNwithquantum-chemicalparametersforthereactionisthesmallestamongtheallmethods.

简介：4,4-Dialkyl-2-oxazolin-5-onesarepreparedbyonestepreactionof2-oxazolin-5-onewiththemagnesiummethylcarbonate(MMC)andalkyIhalides.Itisanovelandconvenientmethodforsynthesisofα,Υ-disubstitutcdα-aminoacidbyhydrolysisof4,4-dialkyl-2-oxazolin-5-ones.

简介：Inthispaper,anovelSPMEmode,PDMS-coatedsolidglassmicrospheres(SGMs),werepreparedbysol-gelmethod.UsinghomemadethermaldesorptionunitcoupledwithCGC-FID,sixPAHsasmodelanalytes,theperformanceofthenewmodewascharacterized.Thenewextractivephaseexhibitedhighthermalstabilityandsatisfactoryextractioncapability.Thedetectionlimitswere0.01-0.045ng/mL,andthelinearitywasfrom0.5ng/mLto96ng/mL.TheR.S.D.sofrepeatabilityforretentiontimeandpeakareawereallwithin0.074%and6.7%,respectively.TherecoveriesofthePAl-Iswere78-127%fromthesamplestakenfromriverwater.

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简介：Ahighlysensitiveelectrochemiluminescence-polymerasechainreaction(ECL-PCR)methodforK-raspointmutationdetectionisdeveloped.Briefly,K-rasoncogenewasamplifiedbyaRu(bpy)32+(TBR)-labeledforwardandabiotin-labeledreverseprimer,andfollowedbydigestionwithMvaIrestrictionenzyme,whichonlycutthewild-typeampliconcontainingitscuttingsite.Thedigestedproductwasthenadsorbedtothestreptavidin-coatedmicrobeadthroughthebiotinlabelanddetectedbyECLassay.TheexperimentresultsshowedthatthedifferentgenotypescanbeclearlydiscriminatedbyECL-PCRmethod.Itisusefulinpointmutationdetection,duetoitssensitivity,safety,andsimplicity.

简介：Aconcisewhileeffectivemethodforthedeacylationof1,4-diacetyl-2,5-piperazinedioneanditsderivativesissupplied.

简介：在pH，1.0酸的媒介，象甲基绿色(MeG)那样的双chargedtriaminotriphenylmethane染料和碘绿色(IG)与钾氰亚铁酸盐反应由静电的力量和恐水病的相互作用的优点形成2:1离子协会建筑群。它导致吸收和散布的回声瑞利(RRS)和新RRS系列的外观的大改进的变化。二个系统有类似光谱特征和他们的最大的RRS波长都在276nm被定位，更小的山峰分别地在332和457nm被定位。RRS的紧张与集中直接成正比[Fe(CN)6]4吗？在0.035.7g的范围???t

简介：　　Enantioimericallypure1,l'-bi-2-naphthol(BINOL)1anditsderivativesareimportantchiralligandsandauxiliariesforanumberofasymmetrictransformations1suchasaldolcondensations,alkylations,Diels-Alderreactions,Michaeladditions,epoxidations,etc.Opticallypure1andtheirderivativeshavealsobeenusedextensivelyinchiralrecognition,chiralseparationandintheconstructionoffunctionalisedmaterials2.Furthermore,(R)-and(S)-BINOLarealsofundamentalstartingmaterialsforthesynthesisofalargevarietyofotherchiralbinaphthylssuchasMOP(2c),NOBIN(2d)andBINAP(2e).Asaresultthedevelopmentofefficientandeconomicmethodsforthepreparationofopticallypure1hasattractedmuchattentioninrecentyears3andnovelmethodsfortheresolutionof(±)-1continuetobedeveloped.……