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2亿+学生的选择
1.下列化肥必须密封保存的是（ ）A．碳酸氢铵 B． 尿素 C．氨水 D．磷矿粉2.草木灰的化学式是什么?3.尿素为什么不属于铵盐?4.下列物质中,可以作为化学肥料的是( )A．食盐 B．碳酸钾 C．消石灰 D．硝酸铵为什么?
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1、C,氨水受热或见光易分解.2、草木灰是混合物,主要成分是碳酸钾,化学式为K2CO3.3、尿素化学式CO(NH2)2,好象铵根离子的化学式是NH4,这个我也不是很清楚.4、BD都可以做化肥,不过碳酸钾主要用于制造钾玻璃、钾肥皂和其他无机化学品,面对七八千块一吨的价格,拿它做肥料,那实在太浪费,硝酸铵会使土壤酸化板结,现在农民都不用了,但是它有另外一个用途---做炸药.
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1、拿捏不准2、K2CO3！3、尿素是氨基酸脱氨基后的产物，它已没有氨，用作化肥是因为它的氮元素4、B消石灰会烧死庄稼的；食盐没氮磷钾，不是肥料；硝酸铵水解呈酸性，会使土壤酸化板结，农作物根就不容易吸收土壤里的营养物质了～能力有限，见谅啊！...
1.A、C。碳铵、氨水易挥发。2. K2CO33.尿素无铵根离子，所以不是铵盐。尿素是酰胺盐。4.B、D。化肥是指速效性的肥料，须提供必需营养元素才可称之为肥料。
1.A2.碳酸钾3.因为尿素的化学式是CO(NH2)2 ，里面含氮，而没有氨根。所以它是 氮肥不是氨肥4.D，N含量高且不易分解挥发。
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基于3-氨基-4-甲基-苯氨基甲酸甲酯路径的尿素法合成甲苯二氨基甲酸甲酯反应分析.pdf 69页
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基于3-氨基-4-甲基-苯氨基甲酸甲酯路径的尿素法合成甲苯二氨基甲酸甲酯反应分析
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河北工业大学硕士学位论文
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The synthesis of toluene diisocyanate (TDI) starting from urea is a green route. In the
toluene-2,4-dicarbamate
synthesized from 2,4-toluene diamine (TDA), urea and methanol (MeOH) via
the reaction
pathway based on methyl 3-amino -4-methyl-N-phenylcarbamate (TMC) intermediate.
thermodynamic
intermediate
reaction of TDA, urea and methanol to TMC and the reaction of TMC, urea and methanol
to TDC, are endothermic because their Δ H are all positive. High temperature is beneficial
to the two reactions. (2) Δ G° of the two reactions is all negative, suggesting that they are
feasible in thermodynamics.
Secondly, the synthesis of TDC by the above two reaction steps was investigated. For
the formation of TMC from the reaction of TDA, urea and MeOH, ZnCl2
was found to be
the suitable catalyst and the reaction conditions were optimized by orthogonal experiment.
conditions
reaction temperature
170℃, reaction time
10h, reaction pressure of 2.2MPa, TDA:ZnCl :Urea:MeOH=1:0.09:2:80 (mol), the yield of
CuCO ·Cu(OH)
was found to be a better
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儿茶酚胺几乎全部在体内代谢，产物为VMA。其代谢途径有二：少部分的CA经单胺氧化化酶作用，生成对-二羟杏仁酸，大部分CA经CA-O-甲基转移酶作用后变为3-甲氧肾上腺肾上腺素或去甲氧肾上腺肾上腺素，最后变为VMA。
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aminetheexpressionofphosphatidylinositol3-kinase(PI3K)intherenalcortexandoutermedullaandemployedthepatch-clamptechniquetostudytheeffectofPI3KontheROMK-likesmall-conductanc【摘要】Objective-Todeterminetheroleofprostacyclin(PGI2)inprotectingendothelialcells(ECs)fromapoptosisandelucidatetheprotectivemechanism.MethodsandResults-ToevaluatetheeffectofPGI2onECsurvival,wetreatedE【摘要】Aquaporin-4(AQP4)waterchannelsexistasheterotetramersofM1andM23splicevariantsandappeartobepresentinorthogonalarraysofintramembraneousparticles(OAPs)visualizedbyfreeze-fracturemicroscopy.Wereporttha用中药，具有抗炎、抗肿瘤、抗氧化、抗动脉粥样硬化、抗病毒等药理作用。从姜黄中用乙醇提取的姜黄素类化合物的主要成分有姜黄素curcumin)、去甲氧基姜黄素(demethoxycurcumin)和双去甲氧基姜黄素(bis．demethoxycurcumin)3种IJ，其分子结构式见图。　　姜黄素类化合物由于结构上的差异使其在药理上的作用有所不同，例如去甲氧基姜黄素抑制TPA引起的癌细胞增生效果最佳；14-3-3蛋白(pdf)【摘要】14-3-3是一个在真核生物中广泛表达的酸性蛋白家族，主要以同源/异源二聚体形式存在，通过磷酸化丝/苏氨酸作用与靶蛋白或靶蛋白的两个结构域结合。七种不同亚型的高度保守的14-3-3蛋白与人类细胞中多种不同的信号通路有着密切的关系。14-3-3通过调节靶蛋白间的相互作用在MAPK级联放大效应等信号转导途径中发挥调控作用。　　【关键词】14-3-3；二聚体；蛋白磷酸化【摘要】Bonemarrow-derivedstemcellshavethepotentialtotransdifferentiateintounexpectedperipheralcells.Wehypothesizethatcirculatingbonemarrow-derivedstemcellsmighthavethecapacitytotransdifferentiateintoepifactor(NGF)resultssecondarilyininhibitionofapicalNa+/H+exchange,therebydecreasingtransepithelialHCO3-absorption.ToassessthepossibleroleoftheNa+/H+exchangerNHE1inthisregulatoryprocess,MTALsfromwild-typascontrolmaterialwhenusingTLCtheidentifythesamples.Thelinearrangeof4?methoxysalicylaldehydewas0.048-0.968μgwithaveragerecoveryof100.86%,RSDof1.34%.Theaverageconcentrationof4?methoxysalicylaldehydeino【摘要】Prostateapoptosisresponse-4(Par-4)isaleucinezipperproteinlinkedtoapoptoticcelldeathinprostatecancerandneuronaltissues.TheleucinezipperdomainofPar-4(Leu.zip)mediatesprotein-proteininteractionsthata1DepartmentofDevelopmentalImmunology-3,LaJollaInstituteforAllergyandImmunology,SanDiego,California,USA.2NaomiBerrieDiabetesCenter,DivisionofEndocrinologyandDepartmentofMedicine,CollegeofPhysiciansandS【关键词】Cross-TalkbetweenGs-HumanmastcellsexpressfunctionalA2AandA2Badenosinereceptors.However,onlystimulationofA2B,notA2A,leadstosecretionofinterleukin(IL)-4,animportantstepinadenosinereceptor-mediatedion-coupledchloridecotransportersfamily(solutecarrierfamilynumber12)areoneofthemaintargets.WNK3activatestheNa+-drivencotransportersNCC,NKCC1,andNKCC2andinhibitstheK+-drivencotransportersKCC1toKCC4.WN若正常成人膳食中不合胆固醇,体内胆固醇的含量将(减少/增多/基本不变);若较长期摄人较大量胆固醇,体内胆固醇的含量将(减少/增多/基本不变).6.磺胺类药物是对氨基苯甲酸的拮抗物,可抑制细菌的合成;甲氧卞氨嘧啶(TMP)则可抑制细菌的还原酶,两者合用可严重干扰细菌的一碳单位代谢.7.DNA复制的方向是,蛋白质生物合成的方向是.8.正常人血胆红素浓度小于mg/dl,当浓度达到mg/dl时即可出现黄疸ofthespleenarepoorlyunderstood.Wedemonstrateherethattheintegrinslymphocytefunctionassociated(LFA)-1and4&1makeessentialandmostlyoverlappingcontributionsnecessaryforBcellmigrationintowhitepulpcordofthespleenarepoorlyunderstood.Wedemonstrateherethattheintegrinslymphocytefunctionassociated(LFA)-1and4&1makeessentialandmostlyoverlappingcontributionsnecessaryforBcellmigrationintowhitepulpcord【关键词】IntracellularAnovelmechanismforantagonismofthehumanchemokinereceptorsCCR4andCCR5hasbeendiscoveredwithaseriesofsmall-moleculecompoundsthatseemstointeractwithanallosteric,intracellularsiteonthereceuteforBiologicalSciences,TokyoUniversityofScience,Chiba278-0022,Japan2DivisionofMolecularbiology,TokyoUniversityofScience,Chiba278-0022,Japan3DivisionofMolecularandCellularImmunology,MedicalInstituteocercellswasdrivenbygeneamplificationandbytheerbBfamilyofreceptorsviaactivationofJanustyrosinekinase-signaltransducersandactivatorsoftranscriptionandproteinkinaseB.TheaberrantlyexpressedreceptorwasphoexusphysiologyandwilllikelyimpactdrugtargetingtotheCNS.Werecentlygeneratedanorganicaniontransporter3-(Oat3)-nullmouse,whichexhibitedlossofPAH,estronesulfate,andtaurocholatetransportinkidneyandoffluore【关键词】TranscriptionTwovitalenzymesoftheCYP3Asubfamily,CYP3A4andCYP3A5,aredifferentiallyexpressedinthehumanlung.However,themolecularmechanismsthatregulatetissue-selectiveexpressionofthegenesarepoorlyundidedwiththedevelopmentofdiarrhea.Geneticknockoutoflongmyosinlightchainkinase(MLCK)ortreatmentofwild-typemicewithahighlyspecificpeptideMLCKinhibitorpreventedepithelialMLCphosphorylation,tightjunctiondersepopulationofhumanTcells.Wereportthatfibroblastsandkeratinocytesfromhumanskinarrayedonasynthetic3-dimensionalmatrixsupportthedevelopmentoffunctionalhumanTcellsfromhematopoieticprecursorcellsintheabveUniversityMedicalResearchService,LouisStokesVAMedicalCenter,Cleveland,OhioBackground.Fms-liketyrosinekinase3ligand(Flt3L)expandsdendritic-cellpopulationsinvivoandprotectsagainstmicrobialinfectioninh【摘要】RecentstudieshavedemonstratedthatTh2cytokines,suchasinterleukin-4andinterleukin-13,enhancefibroticprocessesbyactivatingfibroblastproliferationandcollagenproduction,whereasinterferon-,aTh1cytokine,．组氨酸　　B．蛋氨酸　　C．精氨酸　　D．赖氨酸3．芳香族氨基酸是：A．苯丙氨酸　B．酪氨酸　C．色氨酸　D．脯氨酸4．关于&-螺旋正确的是：A．螺旋中每3．6个氨基酸残基为一周B．为右手螺旋结构C．两螺旋之间借二硫键维持其稳定D．氨基酸侧链R基团分布在螺旋外侧5．蛋白质的二级结构包括：A．&-螺旋　B．&-片层　　C．&-转角　D．无规卷曲6．下列关rtmentofChemicalEngineeringProcesses,UniversityofPadua,Padua,Italy.AbstractActivesuppressionoftumor-specificTlymphocytescanlimittheefficacyofimmunesurveillanceandimmunotherapy.Whiletumor-recruitedCD1
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