简介:为揭示大麦中黄酮合成的分子调控机制,利用反转录PCR结合同源克隆和RACE技术首次从青稞(裸大麦)叶片中克隆获得肉桂酸-4-羟化酶基因(HvC4H)的全长cDNA序列(Genbank登录号:KF927086),总长度1951bp,ORF为1518bp,编码505个氨基酸,等电点PI=9.01,平均亲水指数(GRAVY)为-0.170,属于亲水性碱性蛋白,高级结构分析表明其具有细胞色素P450家族保守域及C4H特异的功能性活性位点。利用实时荧光定量PCR分析胚乳发育5个时期不同组织(茎、叶及子粒)的表达情况,结果显示HvC4H基因在青稞胚乳发育期的表达情况存在着明显的组织差异性,在茎中的表达量最高。本研究为通过调控C4H基因的表达从而提高大麦黄酮的含量奠定了分子生物学基础,对于改良大麦的品质、抗性、生长发育等性状具有重要意义。
简介:本文报道了C6H12O6(NH4)2SO4C2H5OHH2O(C2H5OH/H2O=0.90)体系在35℃时体系溶解度和饱和溶液的折光指数,并绘出了体系相应的溶度图和饱和溶液的折光指数曲线图。结果表明:所研究的体系为四元体系C6H12O6(NH4)2SO4C2H5OHH2O中的一部分。当溶液中肌醇饱和时,溶度曲线落在约50%的等醇水比面上。当(NH4)2SO4在溶液中达到饱和时,出现共饱点。其组成为(NH4)2SO4:210%,C6H12O6:2.08%,C2H5OH:4475%。同时出现分层,在富醇相随着乙醇浓度的增加,出现肌醇与硫酸铵共饱线。在富水相硫酸铵饱和溶度曲线落在约5%乙醇的等醇水比面上,折光指数曲线由三支组成,其中两条分别与C6H12O6·H2O和(NH4)2SO4相对应,另外一条线与(NH4)2SO4和C6H12O6·H2O的共饱线相对应
简介:本文就n-C4H9-Br制备实验的反应过程以及分别用KBr和NaBr制备n-C4H9-Br时出现的不同实验现象和结果进行了探讨。提出KBr的溶解速率比NaBr的溶解速率小是产生不同实验现象和结果的原因,并通过用块状NaBr进行对比实验得到验证。用块状的NaBr有利于提高n-C4H9-Br的产率。
简介:利用角分辨紫外光电子谱对乙烯和乙炔气体在Ru(1010)表面的吸附及与K的共吸附的研究结果表明:当衬底温度超过200K,乙烯即发生脱氢反应,σCH和σCC能级均向高结合能方向移动。在室温下,σCH和σCC能级位置与乙炔在Ru(1010)表面的吸附时的分子能级完全一致。乙烯发生脱氢反应后的主要产物为乙炔。衬底温度从120K到室温,Ru(1010)表面上乙炔的σCH和σCC能级均未发现变化。室温下乙炔仍然可以在Ru(1010)表面以分子状态稳定吸附。在有K的Ru(1010)表面上,室温时σCC谱峰几乎。碱金属K的存在促进了乙炔的分解。
简介:Twooxo-vanadium(IV)complexes,[VO(C2O4)(2,2′-bipy)(H2O)]·C2H5OH(1)andVO(C2O4)(phen)(H2O)(2),where2,2′-bipy=2,2′-bipyridyl,phen=1,10-phenanthroline,weresynthesizedaspotentialfunctionalmodelsofvanadiumhaloperoxidases(VHPOs)inmixedsolventofethanolandwateratroomtemperature.Thecomplexeswerecharacterizedbyelementalanalysis,infrared(IR),UV-VisandX-raycrystallography.Structuralanalysesshowedthatvanadiumatomwascoordinatedbyaterminaloxygen,oneoxygenatomfromcoordinatedwater,twooxygenatomsfromthecarboxylategroupofoxalicacid,andtwonitrogenatoms(N1andN2)from2,2′-bipy/phen.Centralvanadiumatomsincomplexes1and2werebothinadistorted-octahedralenvironment,andsomeintermolecularhydrogenbondinglinkageswerealsoobservedineachcomplex.BrominationreactionactivityofthetwocomplexeswasevaluatedwithphenolredasorganicsubstrateinthepresenceofH2O2,Br-andphosphatebuffer,indicatingthattheycanbeconsideredasapotentialfunctionalmodelofVHPO.Inaddition,thermalanalysiswasalsoperformedanddiscussedindetail.
简介:Aneworganicsemiconductortartaricaciddopedsaltofemeraldinepolyaniline(PANI-C4H6O6)hasbeenobtainedbythemethodofoxidativepolymerizationofmonomericanilinewithammoniumpersulfateinacidicsolution.ThestructurewascharacterizedbyFourierTransformInfraredtechnique(FTIR)andX-raydiffraction(XRD).Thetemperaturedependencedcconductivityδdc(T)showsasemiconductorbehaviorandfollowsthequasionedimensionalvariablerangehopping(Q1D-VRH)model.Dataonδdc(T)arealsodiscussed.
简介:Thispaperreportstwolanthanidecomplexesofformula(C9H7)Ln(C8H8)·(THF)2whereLnisProrNd,C9H7isindenyl,andC8H8iscyclooctatetraene(COT).ThecomplexeswerepreparedbythereactionofLnCl3withK(C9H7)andK2(C8H8)inTHF.(C9H7)Pr(C8H8)·(THF)2crystallizesinTHFat-15℃inthemonoclinicspacegroupP21:withunitcelldimensionsa=8.446(0),b=10.083(2),c=13.407(3),β=105.48(1)°,V=1100.43(35)3,Dc=1.52g/cm3andZ=2.ThefinalRvalueis0.033,Rwvalueis0.030,respectively.In(C9H7)Pr(C8H8)·(THF)2afive-memberedringcentroidofC9H7,theC8H8ringcentroidandthetwooxygenatomsfromthetwoTHFmoleculesformadistortedtetrahedralgeometryaroundthemetal.
简介:Sodiumparanitrophenolatedihydrate(NPNa·2H2O)isanexcellentsemiorganicnonlinearoptical(NLO)material,crystallizesbothinwaterandmethanolwithhighdegreeoftransparency.Goodopticalqualitysinglecrystalsofdimensionupto18mmx6mmx3mmareobtainedbyisothermalsolventevaporationtechnique.Thesolubilityofthecrystalindifferentsolventswasmeasuredgravimetrically.ThesinglecrystalsofNPNa·2H2Oshowvariationinphysicalpropertiesandgrowthrateindifferentsolvents.Methanolorethanolsolutionyieldscrystalsofbipyramidalshapewithclearmorphology.However,methanolgrowncrystalisexhibitingimprovedhardnessparametersandpossessesexcellentthermalstabilityascomparedtowatergrowncrystals.TheeffectsofsolventonhardnessparameteralongwiththermalandopticalpropertiesofNPNa·2H2Owasrevealedinthispaper.
简介:通过电化学分析与测试,研究B4C体积分数分别为20%、30%、40%的B4C/Al基复合材料及其基体合金(6061铝合金)在不同浓度及不同温度的硫酸溶液中的腐蚀行为。由动态极化曲线和阻抗谱得到相应的电化学参数,并利用阻抗分析软件对该复合材料和基体合金腐蚀过程的等效电路进行模拟,分析腐蚀机理,通过Arrhenius方程计算腐蚀过程中B4C/Al基复合材料与6061铝合金的反应活化能,并分析两者的焓变与熵变,对腐蚀前后2种材料界面的微观结构进行观察。结果表明:B4C/Al基复合材料在硫酸溶液中的腐蚀速率随B4C颗粒含量增加而增大,基体铝合金在硫酸中的耐腐蚀性能高于B4C/Al基复合材料。B4C/Al基复合材料和基体铝合金在硫酸中的腐蚀速率都随硫酸溶液浓度增加而增大;当溶液温度升高时,二者的腐蚀速率都快速增加。B4C/Al基复合材料和Al基体合金在硫酸溶液中的腐蚀都表现为明显的点蚀。铝基体材料在硫酸溶液中的反应活化能大于B4C/Al基复合材料,计算所得活化焓与活化熵的值均表明复合材料的腐蚀反应比基体合金更容易进行,因而遭受腐蚀更严重。
简介:Thetitlecomplexi-C4H9Co(salen)(Py)(Py=pyridine.salen=dianionofdisalicylideneethylenediamine)hasbeenfirstsynthesized.ItscrystalstructurehasbeendeterminedbyX-raydiffractionmethod.ThecrystsisaremonoclinicwithspacegroupP21/C.Theunitcellparametesarepresented.ThestructurehasbeenrefinedtoafinalRof0.038.
简介:Ionothermalsynthesiswasusedtoprepareanovelaminoacidcontaininghybridzincophosphatemonomer,[Zn(HPO4)(H2PO4)][C6H10N3O2](denotedasZnPO-CJ58).Theinorganicframeworkof[Zn(HPO4)(H2PO4)]·[C6H10N3O2]consistsof4-memberedringsformedbyZnO3OHisandPO2(OH)2tetrahedra.TheHPO4andaminoacidmoietieshangontheZncenter.Suchaframeworkisstabilizedbyextensivemultipointhydrogenbondsinvolvingthephosphateunitsandhistidinemoleculestoformapseudo-3Dsupramolecularstructure.ItisnoteworthythatZnPO-CJ58isthefirstzincphosphateclusterwithaminoacidactingastheligand.Itexhibitsphotoluminescenceexcitedatawavelengthof220nm.Interestingly,ZnPO-CJ58cantransformintoalayeredstructure(C6H10N3O2)Zn2·(HPO4)(PO4)·H2O(ZnPO-CJ36)throughfurtherreactingwithwaterorzincacetatedihydrateinwaterat85℃for1h.Thisworkwillbehelpfulforthesynthesisofcrystallineinorganic-organichybridmaterialswithbiofunctionalmolecules.