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简介:Fe2O3solwiththeparticlediameterof3-5nmwasflocculatedbytheadditionofSDS,andtheflocculateformedwasredispersedbythefurtheradditionofthatsurfactant.ThusthesurfactantbilayerwasformedonthesurfaceofFe2O3.Theemulsionpolymerizationofstyrene(St)adsolubilizedonthesurfactantadsorbedbilayerwascarriedoutbyinitiatorpotassiumpersulfate(KPS).TheUV-Visandsurfacephotovoltagespectra(SPS)indicatethattheFe2O3particleswereencapsulatedinpolystyrene(PSt)successfully.
简介:Thehydrolysisreactionof(±)-2-acetamido-3-hydroxy-1-(4-nitrophenyl)-1-propanone[(±)-1],anintermediateofchloramphenicol,wasstudiedandthreedifferentproductswereobtainedrespectivelyunderdifferentreactionconditions.Theresolutionofhydrolysisproduct(±)-2-amino-3-hydroxy-1-(4-nitrophenyl)-1-propanone[(±)-3]wascarriedout.Aprocessofcrystallization-inducedasymmetrictransformationwasobservedandupto76%oftheopticallypureenantiomerwasobtainedintheresolutionof(±)-3.
简介:TofindoptimalconditionsforexpressingthesolubleformofsFv-2F3andtostudythepurificationandpropertyofitsderivativeSe-sFv-2F3,thepreferredexpressionconditionswereinvestigatedbymeansoforthogonaldesign.Thesecultureconditionsincludedincubationtemperature,inducerconcentration,inductiontimeandcellconcentration.TheevaluationofexpressionwasaccomplishedbytheanalysisofwholecelllysatesandtheyieldofsolublesFv-2F3wascalculatedaccordingtotheanalysisofProfinder(FTI-500,Pharmacia).Thepurificationprocedurewascarriedoutviaatwo-steppurificationprocedureconsistingofion-exchangechromatography,followedbyimmobilizedmetalaffinitychromatography(IMAC).TheantioxidantefficacyofSe-sFv-2F3wasdemonstratedbythedeterminationofthecontentofthemainproductoflipidperoxidation,MDA,theviabilityofcellsandtheactivityofLDH.WeobtainedthepreferredcultureconditionstogrowtheengineeredbacteriaandtheprocedureforpreparingsolublesFv-2F3andconfirmedtheantioxidantefficacyofSe-sFv-2F3.
简介:[Hmim]3PW12O40wasdevelopedandusedintheacetalizationofcarbonylcompoundsinexcellentyields.Theionicliquid-heteropolyacidhybridcompoundandreactionmediumformedtemperature-dependentphase-separationsystemwiththeeaseofproductaswellascatalystseparation.Thecatalystwasrecycledmorethan10timeswithoutanyapparentlossofcatalyticactivity.
简介:采用PCR法获得拟南芥叶绿体核糖体psrp-3基因序列并进行生物信息学分析.根据psrp-3基因序列保守区设计2对引物,通过RT-PCR获得预期大小的基因序列,琼脂糖凝胶电泳鉴定目的片段.利用生物信息学软件对拟南芥psrp-3基因序列进行同源比对、氨基酸组成、功能域、二级结构、疏水性、蛋白质功能及系统进化分析和预测.结果表明,RT-PCR获得了一段753bp的序列,psrp-3蛋白是等电点为9.27的亲水性稳定蛋白,包含一个结构域和一个区域,α螺旋和不规则卷曲是其蛋白质二级结构的主要结构元件,β折叠和伸展链散布其中,和菠菜、葡萄、蓖麻、大豆等的psrp-3蛋白有较高的同源性.为进一步了解psrp-3基因的功能和作用机制打下基础.
简介:Inthisarticle,nano-scaleAl/Fe2O3compositeswithdifferentmorphologiesweresuccessfullyobtainedbyasimpleelectrospinningtechnique,whichisbasedonasurfactant(polyvinylpyridine,PVP)inamixtureofN,N-dimethylformamide(DMF)and2-propanol.TheelectrospunAl/Fe2O3compositesexhibitedacrystalstructureandphasecompositionbyX-raydiffractionanalysis.ThedifferentmorphologiesoftheAl/Fe2O3compositeswerealsoobservedthroughscanningelectronmicroscopyandtransmissionelectronmicroscopy.Itwasfoundthattherathersimpleelectrospinningmethodusedtopreparethemorphology-controlledAl/Fe2O3compositesmayhavethepotentialforpreparationofpropellants,explosives,andpyrotechnicsinthefuture.
简介:为踪迹更少的一个新奇灵巧的过程在好收益并且与用支持聚合物的乙烯基硒化物的优秀纯净的3代用品isoxazoles的稳固阶段的合成被开发了。
简介:在这研究,新有点磁性、光的Fe3O4/CdTenanocomposites的准备被表明。SuperparamagneticFe3O4nanoparticles被铁、铁的离子的热水的一起沉淀首先综合,与丁氨二酸酸与tetramethylammonium氢氧化物(TMAOH)和化学激活由他们的表面的修正列在后面。修改表面的Fe3O4nanoparticles当时与CdTe量点(QD)是covalently涂的,它与mercaptoacetic酸(MPA)被修改,到通过Fe3O4和carboxyl的表面上的氨基的组的协作的Fe3O4/CdTe磁性、光的nanocomposites在CdTeQD上组织的形式。同样综合的nanocomposites的结构和性质被描绘。nanocomposites与40-50nm,黄绿色的排放特征和房间温度强磁性的一条平均直径拥有了结构,这被显示。荧光和nanocomposites的紫外力的吸收系列显示出CdTeQD与那些作比较的蓝移动。蓝移动的机制被介绍。nanocomposites与8.9emu/g的浸透磁化保留了铁磁性的性质。
简介:ThecrystalstructureofN-(2,3,4,6-tetra-O-acetyl-β-D-gly-cosyl)-thiocarbamicbenzoylhydrazine(C22H27N3O9S)wasdeterminedbyX-raydiffractonmethod.Thehexopyranosylringadoptsachairconformation.Alltheringsubstituentsareintheequatorialpositions.Theacetoxyl-methylgroupisinsynclinalconformation.TheSatomisinsynperiplanarconformationwhilethebenzoylhydrazinemoietyisanti-periplanar.Thethiocarbamicmoietyisalmostcompanarwiththebenzoylhydrazinegroup.Therearetwointramolecularhydrogenbondsandoneintermolecularhydrogenbondforeachmoleculeinthecrystalstructure.Themoleculesformanetworkstructurethroughintermolecularhydrogenbonds.
简介:STUDIESONTHESYNTHESISANDREACTIONWITHALKOXIDESOF3-OXO-1,2-BENZOISOTHIAZOLINE-2-ACETAMIDE1,1-DIOXIDESGuoFengZHAO;HuaZbengYANG(I...
简介:标题化合物(C24H16N4S)以噻吩-2-甲醛、苯甲酰乙腈和3-甲基-1-苯基-1H-吡唑-5-胺为原料,在离子液体[bmim]Br溶剂中,在80℃搅拌合成得到.其结构通过单晶X射线衍射法确定,晶体属于三斜晶系,空间群P-1,相对分子质量Mr=392.47,晶胞参数a=0.93612(8)nm,b=1.03063(12)nm,c=1.16624(16)nm,V=0.96853(19)nm3,Z=2,晶胞密度Dc=1.346g/cm3,吸收系数μ=0.185mm-1,单胞中电子的数目F(000)=408.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子R=0.0585,wR=0.1337.在晶体结构中新形成的吡啶环与吡唑环近似于共平面结构.
简介:用复合酶法对大蒜多糖的提取工艺进行研究,并考察了不同浓度沉淀多糖的抗氧化活性;以多糖提取得率为指标,苯酚一硫酸法测定多糖的总糖含量,采用正交实验确定纤维素酶、木瓜蛋白酶和果胶酶的最佳配比,然后在单因素试验的基础上,采用正交实验优化复合酶提取大蒜多糖的最佳工艺;分别用羟基自由基(·OH)和1-二苯基-2-苦基肼基(DPPH·)有机自由基测定了大蒜多糖的抗氧化活性.复合酶法提取大蒜多糖的最佳酶配比:纤维素酶、木瓜蛋白酶、果胶酶的配比为1:60:5;最佳提取工艺条件:提取温度为55℃,提取时间为90min,pH值为4,料液比为1:30g/mL,该工艺条件下多糖提取得率达74.28%;80%的乙醇沉淀多糖对DPPH·和·OH的清除作用最显著,40%次之,粗多糖最弱.复合酶法提取大蒜多糖具有提取得率高的优点,并且大蒜具有一定的抗氧化作用.