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:摘要:目的:分析3.0T高分辨率MRI在直肠癌术前T分期中效果。方法:按照随机数字表法选取2021年12月--2023年08月我院收治的100例直肠癌患者,所有患者均进行3.0T高分辨率MRI和病理诊断,分析临床诊断效果。结果:3.0T高分辨率MRI对疾病类型的诊断符合率低于病理检查,P>0.05。结论:在直肠癌术前T分期中给予3.0T高分辨率MRI的诊断准确率高,为临床诊断提供科学参考依据。
简介:近日,美国食品药品监督管理局(FDA)批准诺华的CAR—T疗法Kymriah(tisagenlecleucel)上市,用于治疗急性淋巴细胞白血病(ALL),