简介:Aditerpenoid,neostellerin,wasisolatedfromtherootsofStellerachamaejasmeLtogetherwith4knowncompoundsidentifiedasβ-sitosterol,scopoletin,umbelliferoneanddaucosterol.Thestructureofneostellerin,whichwaselucidatedbyNMR,especially2DNMRanalysis,wasdifferentfromotherdaphnanetypediterpenesisolatedfromthisplant.
简介:目的:以L-半胱氨酸和吲哚为底物,利用色氨酸酶基因工程菌WW-11酶法合成L-色氨酸。方法:以IPTG诱导基因工程菌色氨酸酶表达,将酶活最高时的工程菌游离细胞作为转化反应的酶源,通过纸层析和氨基酸自动分析仪分析并测定转化液中L-色氨酸的含量,结果:80mL反应液(L-半胱氨酸0.75g,吲哚75g)37℃反应48h,可积累L-色氨酸1.18g,L-半腕氨酸转化率为93.2%,吲哚转化率为90.1%,经分离纯化所得的L-色氨酸晶体,在熔点,旋光性和红外吸收光谱等方面与标准品完全一致,结论:色氨酸酶基因工程菌能有效地催化L-半胱氨酸和吲哚合成L-色氨酸,这种酶合成法是工业化生产L-色氨酸较为有效的方法之一。
简介:ChinahasagreatresourceofCannabis.ResearchonthetaxonomyandmorphologyofChineseCannabishasbeencarriedout,butsofarnomoleculargeneticresearchhasbeenpublished.RandomamplifiedpolymorphicDNA(RAPD)isasuitabletechniqueformoleculargeneticresearchonCannabis.Intillsexperiment,usingCannabisherbariumspecimensasasourceofgeneticmaterials,thecorrelativeconditionsofthePolymerasechainreaction(PCR),(i.e.,gradientdensityofMg^2+,dNTPs,TaqDNApolymerase,annealtemperature,annealtimeandreactioncycles)wereexaminedseparately.AneffectiveprocedurefortheRAPDanalysisofCannabiswasobtained.
简介:ObjectiveToinvestigatethealterationsofL-typecalciumcurrent(IcaL)inabdominalaorticligation-inducedhypertrophiedratheartsandtheeffectoflosartanonthesealterations.METHODSCardiachypertrophywasinducedbyabdominalaorticligationinrats.TorecordIcaL,whole-cellpatch-clamptechniquewasused.RESULTSMembranecapacitancewaslargerinhypertrophiedcells(148±29pF)thaninsham-operatedcells(102±14pF,P<0.01)andlosartan-treatedcells(118±27,P<0.01).ThemaximalpeakIcaLWasincreasedfrom-835±124pAinsham-operatedcellsto-1404+_417pAinhypertrophiedcells(P<0.01),thecorrespondingIcaLdensitywasincreasedfrom-7.5±1.8pA.pF^1to-10.5±2.2pA.pF^1(P<0.01),whiletheywerereducedto-956-2:170pF(P<0.01)and-8.2±1.6pA.pF^1(P<0.05)respectivelyinlosartan-treatedcells.Themembranepotentialofhalfmaximalactivationofthehypertrophiedcells(-20.6±1.0mV)shiftedtomorenegativepotentialsthansham-operatedcells(-15.6±1.6mV,P<0.01)andlorsartan-treatedcells(-17.4±1.0mV,P<0.01).Theslopeoftheactivationcurveofhypertrophiedcells(5.7±0.4)wasdecreasedslightlythansham-operatedcells(6.4±0.5,P<0.05).Themembranepotentialofhalfmaximalinactivationofhypertrophiedcells(-27.6±1.9mV)shiftedtomorepositivepotentialsthansham-operatedcells(-31.4±2.2mV,P<0.05).Theslopeofinactivationcurveswerenotdifferentinthethreegroups.
简介:Osteoporosisisametabolicskeletaldisorderleadingtobonefracturewhichadverselyimpactsthequalityoflife.Inthepresent,weaimedtoinvestigatetheeffectofPeperomiapellucida(L.)Kunthherbjuiceandethanolicextractonovariectomy(OVX)-inducedosteoporoticratmodel.OsteoporosiswasinducedbyOVXwithadoubledorsolateralapproachonfemaleWistarrats.FemaleWistarratsundergoingshamsurgeries(sham-controlgroup)servedascontrols.Theovariectomizedratsweredividedintosixgroupsbasedonadministeredtreatments,(i)CMCNa0.3%(OVX-controlgroup),(ii)standarddrug(ethynilestradiol4.5μg/kg),(iii)P.pellucidajuiceatdoseof50mg/kg,and(iv)100mg/kg,(v)P.pellucidaethanolicextractatdoseof50mg/kg,and(vi)100mg/kg.Treatmentswerestarted1weekafterthesurgeriesandlastedfor6weeks.Ratstreatedwith100mg/kgP.pellucidaethanolextracthadsignificantlydecreasedserumALPlevelandreducedexcretionofurinecalciumcomparedwiththeOVX-controlgroup(P<0.05).Theselevelswerenotsignificantlyalteredwhencomparedwiththesham-controlgroup(P<0.05).Furthermore,100mg/kgethanolicextract-treatedgroupshowedimprovementonthree-dimensionalimageofthetrabecularbonecomparedwiththeOVX-controlgroup.Trabecularcavityformationin100mg/kgethanolicextract-treatedgroupwasminimal.EthanolicextractofPeperomiapellucida(L.)Kunthherbsatadoseof100mg/kghadpreventiveeffectonOVX-inducedosteoporoticrats.
简介:目的初步探讨大剂量L-精氨酸致急性坏死性胰腺炎的发病机制。方法观察大鼠血清,胰腺组织一氧化氮(NO)含量的变化及胰腺组织巯基物质和丙二醛(MDA)的变化,以及黄嘌呤氧化酶抑制剂别嘌呤醇在急性坏死性胰腺炎中的作用。结果血清NO呈先升高后降低再回升趋势,胰腺组织NO则一过性降低;急性坏死性胰腺炎早期大鼠胰腺组织内巯基物质含量明显减法,MDA含量明显增加,而别嘌呤醇可对抗这种变化,并可显著降低急性坏死性胰腺炎大鼠血清淀粉酶的增高程度,减轻胰腺损伤。结论以巯基物质为代表的机体的防御体系与以MDA为代表的损伤体系的失衡可能是大剂量L-精氨酸造成胰腺组织损伤的重要原因,别嘌呤醇能够在一定程度上可以减轻急性坏死性胰腺炎时的胰腺损伤。
简介:目的分析对妊娠期高血压大鼠实施L-精氨酸治疗的临床疗效。方法建立妊娠高血压大鼠模型共60只,分为对照组(30只,使用硫酸镁治疗)和观察组(30只,使用L-精氨酸治疗),比较两组效果。结果观察组大鼠的血压值和死胎率均明显低于对照组,差异均有统计学意义(P<0.05)。结论对妊娠期高血压大鼠使用L-精氨酸治疗可取得较好效果。