简介:Threetypesofroughsurfacewereprocessedbylaserirradiationonthe3Cr2W8Vmaterialhot-workdiesteelsurface.Thewearexperimentswithsmoothsurfaceandroughsurfacesampleswererepeatedonthepin-traywearmachine.Accordingtothewearresults,westudiedtheregularityofwearresistanceofdifferentroughsurfacesamples.Theresultsindicatedthatbionicroughsurfacecanimprovethewearresistanceofthematerialandthewearresistancecanbeincreased1-2times,comparedwiththesmoothsurface.Also,thewearresistanceoftheroughsurfacewasaffectedbylasercurrentanddurationofimpulse.Thebiggerthelasercurrentortheimpulseduration,thebetteristhewearresistance.Whenthedistancebetweenthesamekindofunitswhicharedistributedonthesurfacesischanged,thewearresistancechanges.Thewearresistanceofabionicroughsurfaceonwhichthegridunitsweredistributedatspacingof1mmwasthebest.Andwedesignedthewearmodels.
简介:目的:从中国南海芋螺中克隆新的J超家族芋螺毒素,并进行序列和进化分析。方法:以芋螺毒腺管总RNA为模板,采用3′-RACE及巢式PCR的方法扩增J超家族芋螺毒素基因,并将得到的目的基因与pMD18-T载体连接并转化大肠杆菌DH5α,经测序比对后,获得新的J超家族毒素,利用软件BioEdit、ClustalX及Mega5.05进行进化分析。结果:获得12个新的J超家族芋螺毒素前体肽序列,其氨基酸组成具有新颖性,在进化树上与已报道的J超家族毒素处于不同的进化分支。结论:12个新的J超家族毒素与已报道的毒素序列之间的同源性较低,是J超家族新成员。
简介:目的:探索和络泄浊颗粒对大鼠肾脏纤维化中miR-200a表达的影响及探讨其可能存在的作用机制。方法:30只SD雄性大鼠随机分为6组:假手术组(Sham)、手术组(UUO)及和络泄浊颗粒(UUO+REG)组各2组,运用单侧(左)输尿管结扎法制造肾间质纤维化模型,但Sham组仅游离输尿管,而其余两组则游离并结扎输尿管。术后各组按1mg/kg·d-1的量进行灌胃,UUO+REG组给予REG,其余两组则予生理盐水。术后第7天和14天,摘除左梗阻侧肾脏进行免疫组化检查α-SMA和荧光定量PCR检测miR-200a的表达。结果:在UUO及UUO+REG组,α-SMA表达明显高于Sham组(P〈0.01);UUO+REG组低于UUO组(P〈0.05)。miR-200a表达水平在UUO组和UUO+REG组都是降低的,但是UUO组与Sham组差别明显(P〈0.01),其与UUO+REG组亦有明显的差别(P〈0.05)。结论:和络泄浊颗粒可以通过上调miR-200a延缓肾脏纤维化进展。
简介:Amurinemacrophage-likecelllineJ774,acquired,inresponsetoLPS,anabilitytokilltumornecrosisfactor(TNF)-insensitivetargetP815mastocytomacellswhereasanothercellline,P388D1didnot,LPStriggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference,TheresultswhowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2(PLCandPLA2)toapproximatelythesameextent.ThemaximumresponseoftothenzymesofJ774cellswasnotedwithin10minthetreatmentwhereasthatofP388D1cellsrequiredmorethan20min,TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,includingActivationofPLCandPLA2andPKCinmacrophagesbyLPS.Ca2+augmentationofenzymeactivation,participationofguaninenucleotidebinding(G)proteinsintheinitialactivationpreocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpertussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities.J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform,Nevertheless,thequestionwhyJ774cellsbutnotP388D1cells,canacquirethetumoricidalactivity,aganistP815,cellsfollowingLPStreatmentrematinstobeanswered.
简介:【目的】松材线虫作为林业重大外来入侵种,扩散型幼虫的形成对其传播扩散起着非常重要的作用,但扩散虫态的形成与维持机制尚未阐明.【方法】通过构建松材线虫数字基因表达谱(DGE),从滞育状态的维持、化学感受、代谢途径等方面分析松材线虫不同虫态的基因表达差异.【结果】参考松材线虫基因组数据,鉴定出2种扩散型幼虫(LⅢ,LⅣ)和繁殖型幼虫(Ln)各有11184、8533和10781个基因.相对于繁殖型虫态,大多数基因在LⅣ中下调表达,该虫态中特异上调表达的基因有化感受体基因、核受体基因以及一些代谢相关基因.推测这可能与扩散型线虫滞育状态的维持相关,并在其生理功能如化学感受和媒介/寄主互作中发挥作用.GO和Pathway富集分析显示,多数代谢相关通路在L,中下调表达,而在LⅢ中的表达均活跃.【结论】以上结果与LⅣ处于不进食、总体代谢水平较低等生理状态的表型相一致.
简介:Amurinemacrophage-likecellline,J774,acquried,inresponsetoLPS,anabilitytokilltumornecrosisfactor(TNF)-insensitivetargetP815mastocytomacells,whereasanothercellline,P388D1,didnot.LPS-triggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference.TheresultsshowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2(PLCandPLA2)toapproximatelythesameextent.ThemaximumresponseofbothenzymesofJ774cellswasnotedwithin10minofthetreatment,whereasthatofP388D1cellsrequiredmorethan20min.TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,ineludingActivationofPLCandPLA2andPKCinmacrophagesbyLPSCa2+augmentationofenzymeactivation,participationofguaninenucleotidebinding(G)proteinsintheinitialactivationprocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpartussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities,J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform.Nevertheless,thequestionwhyJ774cells,butnotP388D1cells,canacquirethetumoricidalactiyity,aganistP815cellsfollowingLPS-treatmentremainstobeanswered.
简介:鼻-眼-脑型真菌感染(ROCM)致死率高达60%~85%,发病早期易误诊误治。文章就该病的流行病学特点、病理生理过程、临床表现、辅助检查、治疗方法作一简要综述,希望为临床诊治提供一定帮助。
简介:目的了解趾间型足癣患者趾间和健康志愿者趾间细菌菌种分布特征。方法对37例经临床和真菌镜检确诊的趾间型足癣患者的趾间进行细菌培养,然后给予1%联苯苄唑霜1次/d外用治疗4周,在治疗后的第1、2、4周分别对趾间再进行细菌培养。33例健康志愿者作为对照。结果健康志愿者趾间细菌培养葡萄球菌属占92.5%,其中表皮葡萄球菌占32.5%,未分离到金黄色葡萄球菌。趾间型足癣患者细菌培养葡萄球菌属占74.4%,其中金黄色葡萄球菌占27.9%,表皮葡萄球菌仅占2.3%,还分离到化脓性链球菌、粪肠球菌、屎肠球菌、奇异变形杆菌、铜绿假单胞菌等。经过4周的外用联苯苄唑霜治疗,金黄色葡萄球菌消失,表皮葡萄球菌又成为优势菌(37.5%)。结论趾间型足癣患者趾间金黄色葡萄球菌的分离率明显高,此乃足癣继发细菌感染的主要致病菌,因此积极治疗足癣对预防足癣合并症有非常重要的意义。