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简介：抗氧剂和抗臭氧剂是重要的精细化工产品类别之一。本资料为《化工百科全书》主词条之一，文中对抗氧剂和抗臭氧剂进行了科学完整的介绍，对该类产品的理论知识和实践成果进行了系统的论述，并介绍了相关工业的技术现状和发展趋势。

简介：利用Gaussian-94计算程序中的B3LYP方法,在6-311+G(2d)6d基组下,对Si5,Si5H3,Si5H6,Si5Li3和Si5Na3原子簇的几何结构进行优化和频率计算.结果表明,Si5原子簇中最稳定的具有D3h对称性的结构中,位于同一平面上的3个Si原子确实具有剩余的成键能力,可以与3个H,Li,Na原子和6个H原子形成稳定的化合物.研究还发现,虽然H,Li和Na都属同一主族,但它们与Si5原子簇中Si原子的键连方式却不同,而且它们的加入,对Si5原子簇的'三角双锥'结构也有不同的影响.

简介：合成了多孔黑色二氧化钛（PB-TiO2）,并将其作为原料制备得到PB-TiO2涂层隔膜（PB-TiO2@PP）,研究了隔膜对锂硫电池电化学性能的影响.电化学性能测试表明,PBTiO2@PP隔膜能够大幅度提高电池的比容量、有效改善电池的倍率性能和循环稳定性.在1C倍率下,放电容量能够保持在882mAh/g.100次循环之后,容量仍能保持在780mAh/g,容量保持率接近90%.

简介：用PCR方法扩增了人的BAF53全长cDNA序列,用酶切后的ΔBAF53cDNA片段构建了表达质粒.转化大肠杆菌后,经IPTG诱导表达,再经包涵体裂解、纯化,得到hBAF53抗原多肽.从免疫动物身上获得实验动物的抗血清.通过斑点印迹方法测得hBAF53抗血清的特异性和效价,又用已提取的HeLa细胞核蛋白(含有天然BAF53蛋白)进行免疫印迹分析,证明天然BAF53蛋白是该抗血清的抗原,说明获得的抗血清具有比较高的特异性,可用于染色体改构复合物各亚基间相互作用分析及调控基因转录机理方面的研究.

简介：AF-5wassynthesizedthroughaconvergentmethod.ThekeystepwastheRobinsonannulationusingakeyintermediatepentylvinylketone.

简介：Tris)(η5-cyclopentadienyl-μ-carbonyl-iron)-μ3-nitrosylclusterwasobtainedfromthereactionofcyclopentadienyldicarbonylirondimerwithnitrogenmonoxideinxylene.Theclusterwascharacterizedbyelementalanalyses,IR,MSand1HNMR.Thecrystalstructureof[(η5-C5H5)(μ-CO)Fe]3(μ3-NO).C4H8OwasdeterminedbyX-raydiffractionanalysis.ItcrystallizesintheorthorhombicspacegroupPnma,a=9.053(2),6=10.545(2),c=22.525(4)A,V=2150.3(7)A3,Z=4,Dc=1.68g.cm-3;structuresolutionandrefinementbasedon1141reflectionswithI>3.0(I)(MoKa,A=0.71073A)convergedatR=0.0540.Theinfraredabsorptionbandat1325cm-1oftheμ3-NOinthecluster,whichisredshifted,showsthatμ3-NOisactivated.

简介：(-)-(5R,6S)-6-Acetoxyhexadecan-5-olide1,anaturalmosquitoattractantpheromone,wassynthesizedfromreadilyavailablealdehyde2andcyclopentanone3usingL-proline-catalyzedasymmetricaldolreactionasthekeystep.

简介：采用薄层色谱法分离菠菜叶片中的色素,并对其胡萝卜素的鉴别和含量测定.以硅胶G作为吸附剂,石油醚/乙醇/丙酮=3/2/1（体积比）的混合溶液为提取剂,石油醚/丙酮=2/1（体积比）的混合溶液为展开剂为最佳条件,提取和分离菠菜色素.菠菜中的胡萝卜素用薄层扫描仪在波长464.5nm条件下进行测定.结果表明,胡萝卜素在0.03～0.21μg范围内呈现良好的线性关系（r=0.9998）,加标回收率为95.25%～96.44%,相对标准偏差为0.59%.该方法的重复性、稳定性均满足分析的需要.

简介：TwonewcoenzymeB12analogues,2’,5’-dideoxycytidylcobalamin(2a)and2’,5’-dide-oxyuridinylcobalamin(2b),andtwoothers,2’,5’-dideoxyadenosylcobalamin(2c),and5’-deoxy-thymidylcobalamin(2d)werepreparedbyanimprovedmethod.AllthefouranalogueswereinvestigatedbyUV-visand2D1HNMRspectroscopy.Thecomparisonsanddiscussionabouttheirspectroscopicpropertiesweredone.

简介：(±)-5,5'-Dihydroxy-7,7'-dimethoxy-8,8'-biflavone((±)-l)wasresolvedintoitsopti-callypureformsviatheformationandrecrystallizationofits(2R)-and(2S)-l-(4-toluenesulfonyl)proly-late,andthemethylatedderivativesof(+)-and(-)-lwerealsoprepared.Theabsoluteconfigurationsofallthese8,8'-biflavoneshavebeenconfirmedbytheirCDspectra.

简介：Reactionsofthe6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrilederivative1withα-halo-carbonylcompoundsgavetheortho-substitutedintermediates2a-cwhichwereconvertedintofuro[2,3-b]thiopyrano[4,3-d]pyridines3a-cbyfusionofafuranmoietyunderbasicconditions.Furthercyclizationof3a-cledtoafusionofapyrimidinering,yieldingthetetracyclicproducts6,7and8.Inaddition,condensationof6withvariousaromaticaldehydesaffordedthecorrespondingimines9a,b.Mannichreactionof7gaveproducts10a,b.

简介：Fourteennew1-acyl-5-arylbiuretsweresynthesizedbythereactionofarylureaswithacylisocynantes.Thelatterwasobtainedfromacylchlorideandleadcyanateindichloromethane,usingpyridineascatalyst.Thestructuresofcompounds3a-nwereconfirmedbyIR,1HNMRandMSspectra.

简介：分析鉴定ApoCⅢ转基因阳性小型猪.从仔猪尾中提取基因组DNA,通过PCR和Southernblotting等手段进行鉴定;从仔猪肝、小肠、心、肾、肺、脾、胃以及皮肤等冰冻组织以Trizol法提取RNA,以RT-PCR手段进行检测分析.经过对18头仔猪进行PCR分析,显示其中的15头含有人ApoCⅢ基因,随后的测序和Southernblotting亦证实,猪的基因组中已经整合有人ApoCⅢ基因.RT-PCR证实人apoCⅢ基因已经在转基因小型猪的肝脏和小肠中进行了翻译.本研究成功制备了人ApoCⅢ转基因小型猪,可作为高脂血症与动脉粥样硬化疾病之间关系很有价值的研究模型.

简介：Treatmentof4-amino-3-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-5-mercapto-1,2,4-triazoles/2-amino-5-(1-aryl-5-methyl-1,2,3-triazole-4-yl)-1,3,4-thiadiazoleswithbenzaldehyde,acetoneandω-bromoacetophenonewastestedandcompared.ThetitlecompoundsSchiffbases,amides,imidazolo[2,1-b]-1,3,4-thiadiazolesand7H-s-triazolo[3,4-b]-1,3,4-thiadiazineshavebeenconfirmedbyelementalanalyses,^1HNMR,IRandMSspectra.AllthecompoundshavealsobeenscreenedfortheirantibacterialactivitiesagainstB.subtilis,S.aureusandE.coli.

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简介：5-Amino-1,10-phenanthrolineandthreetypesofnew5-substituted1,10-phenanthrolinederivativesbydifferentalkylamides,phen-NHCOR[phen=1,10-phenanthrolineR=CH=CH2;(CH2)nBr,n=1,3-5(CH2)nCH3,n=9--14],weresynthesized.Theywerecharacterizedbymeansofelementalanalyses,infraredspectroscopy,protonnuclearmagneticresonancespectroscopy,andmassspectroscopy.Thesenewcompoundsareimportantligandsortheactivematerialsofruthenium(Ⅱ)electrochemiluminescent(ECL)sensors.

简介：ThecatalyticactivityofFe/ZSM-5fortheselectivereductionofNOtoN2withmethaneinthepresenceofexcessO2wasstudied.Fe/ZSM-5catalystswithvariousFeloadingswerepreparedbyimpregnationmethod.ItiswellknownthatmethaneisinactivewhenFe/ZSM-5asthecatalystfortheselectivecatalyticreduction(SCR)ofNOwithmethane.However,thispapershowsthatwhenthecontentofFewasabout0.5%,Fe/ZSM-5showedhighercatalyticactivityandselectivityofmethane,andputforwardmeasurableactivationforCH4isanimportantfactorforthereactionofremovalofNOxwithCH4.

简介：Sulfonylureaherbicideshavebeenwidelyusedbecauseoftheirlowapplicationrates,goodcropselectivitiesandlowmammaliantoxicities.However,somesulfonylureasmightpersistunfavourablyintheenvironmentwithresidualproblems.Inordertolookforecologicallysaferandenvironmentallybenignsulfonylureas,andonkeepingthepyrimidineringbeingmonosubstituted,15novelC5-monosubstitutedbenzenesulfonylureacompoundsweresynthesized.Thestructuresofallthecompoundssynthesizedwereconfirmedbyelementalanalysisand1HNMR.PreliminaryherbicidalactivitiesofthesenewsulfonylureacompoundsweredeterminedbyALSscreening(invitro)andpotbioassayexperiments(invivo).TheherbicidalresultsshowthatsomenovelsulfonylureasarecomparabletocommercialForamsulfuronandMonosulfuron.

简介：将高山红景天多糖作用于转化生长因子β1（TGF-β1）诱导的A549细胞,观察细胞形态变化,MTT法测定其对细胞增殖的影响,WesternBlotting法及间接免疫荧光法测定细胞中间充质标志物Fibronectin-EDA（Fn-EDA）的表达变化.结果表明：高山红景天多糖可以抑制TGF-β1诱导的A549细胞凋亡;高山红景天多糖促进体外培养的TGF-β1诱导的A549细胞增殖;降低了TGF-β1诱导的A549细胞中Fn-EDA的表达;可以抑制TGF-β1诱导A549细胞向间充质细胞转化.研究结果显示高山红景天多糖可以明显改善体外诱导的肺组织细胞纤维化状态.