简介:摘要幼儿园的语言教育,应该以言语教育为手段,以一日生活为途径,利用一切积极因素和机会,灵活、随机地引导幼儿的语言活动,使他们乐意地运用语言进行交往,帮助他们积累运用语言的技能。幼儿只有具备了一定的语言素质,才能表达思想、吸收知识,才谈得上今后的全面发展。
简介:目的观察微小RNA(microRNA,miR)-142-3p对血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)诱导的心肌肥厚中线粒体功能的影响。方法我们使用Sprague-Dawley(SD)大鼠的乳鼠心肌细胞,细胞培养后分成4组:空白组;AngII组;miRnc+AngII组;miR-142-3pmimic+AngII组。分别往细胞中转染相同浓度的miR-142-3p和miRnc质粒6h,实时定量聚合酶链反应(real-timepolymerasechainreaction,rt-PCR)检测实验组miR-142-3pmRNA表达增多,提示细胞质粒转染成功,再用10-6mol/L浓度的AngII诱导细胞48h,使用线粒体Mito-RedTracker处理细胞30min,共聚焦显微镜观察细胞中线粒体密度的变化;使用流式细胞仪检测线粒体膜电位变化。结果与空白组相比,AngII组的线粒体膜电位减低(n=3,P<0.01);与AngⅡ+miRnc组相比,AngⅡ+miR-142-3p组的线粒体膜电位增加(n=3,P<0.01)。与空白组相比,AngⅡ组的线粒体荧光数量减低(n=3,P<0.01);与AngⅡ+miRnc组相比,AngⅡ+miR-142-3p组的线粒体荧光数量增加(n=3,P<0.01)。结论在AngⅡ诱导心肌肥大过程中miR-142-3p对心肌线粒体具有保护作用。
简介:Theyolk-shellLaMnO3perovskitemicrosphereswerefabricatedbyanovel,simpleandmildsofttemplateapproach.Aseriesoftemplate-P123concentrations(0-6.12mmol·L^-1)wereemployedtooptimizethemostcompletespheres.WhentheconcentrationofP123is3.0mmol·L^-1,theobtainedyolk-shellmicrosphereswithadiameterof200-700nmwereconstructedbynanoparticles.Thepossibleformationmechanismoftheyolk-shellmicrosphereswasrevealedstepbystepviaXRD,SEM,TEM,EDSandHRTEM.MoleculesofP123weresuitablymixedwithsolventsfordoubleshelledvesiclesthroughself-assembly,whichinteractedwithmetalcomplexestoformP123-metalvesicles.AftertheremovalofP123andcitricacidbycalcinationat700℃,theyolk-shellLaMnO3microsphereswiththrough-channelswereobtained.Through-channelsonthesurfacewereduetocitricacidandthesolidcorewasattributedtotheshrinkofinnervesicles.Preparedyolk-shellmicrospheresamplespossessedalargersurfaceareaandahighermaximumNOconversionvalueof78%at314℃forNOoxidation,comparedwithsampleswithouttheyolk-shellstructure.