简介:目的选择弓形虫RH株主要表面抗原P30、P22的有效基因片段和霍乱毒素A2/B亚基共同构建在同一真核表达载体pcDNA3.1(-)上,并保证其连接方向和开放读码框的正确.方法用PCR技术分别从弓形虫RH株基因组DNA和pUAB024-CTXA28/B质粒中扩增编码P30、P22基因片段和CTXA2/B,定向重组入pUC18克隆载体,然后酶切释放P30-P22-CTXA2/B复合基因片段,亚克隆入pcDNA3.1(-)真核表达载体,再经含氨苄青霉索的LB培养基筛选、酶切及测序鉴定.结果酶切产物经电泳显示条带清晰,P30、P22和CTXA2/B基因片段的泳动位置分别在786bp、492bp、512bp的位置,与预计结果一致;测序结果表明插入的基因片段方向及序列均正确.结论成功地构建了真核表达重组质粒pcDNA3.1-P30-P22-CTXA2/B,保证了三个基因连接方向,序列及开放读码框的正确,为下一步融合蛋白P30-P22-CTXAA/B在哺乳动物细胞中的表达及动物实验奠定了基础.
简介:Helicopterinspectionofultrahighvoltage(UHV)transmissionlineshasunmatchedadvantagescomparedtomanualworkduetotheinspectionangleandhigh-techequipmentonboard,especiallyindetailedinspectionsoftowerheadsanddefect-detectionsinvirtueofinfrared/ultraviolettechniques.Thispaperdealswithsomekeytechnicalproblemsintheinspectionsof1000kVUHVAClineswithahelicopter,suchasthesafedistanceoflive-lineworking,electromagneticfieldintensityandflightcontrol.Basedonthestudyresults,asetofUHVlineinspectionmethodswasworkedoutandappliedtotheinspectionofliveUHVlines.
简介:摘要目的探讨糖化血红蛋白(HbA1c)、C肽(C-P)水平与2型糖尿病周围神经病变的关联性。方法回顾性分析2020年2月至2022年1月济南市第二人民医院行冠脉造影检查结果诊断为2型糖尿病患者96例(单纯2型糖尿病26例、2型糖尿病周围神经病变70例),另选取32例健康者为健康组。单纯2型糖尿病组男12例、女14例,年龄32~68(55.26±7.14)岁;2型糖尿病周围神经病变组男32例、女38例,年龄30~67(53.24±7.14)岁;健康组男20例、女12例,年龄30~76(58.25±7.69)岁。收集并比较患者临床资料;测定HbA1c、C-P水平;采用Spearman法分析HbA1c、C-P水平与2型糖尿病周围神经病变的相关性。计量资料采用t检验、F检验,计数资料采用χ2检验。结果单纯2型糖尿病组、2型糖尿病周围神经病变组患者HbA1c水平[(7.37±0.87)%、(8.52±0.96)%]、C-P水平[(5.63±1.67)μg/L、(7.14±1.84)μg/L]均高于健康组[(7.02±0.68)%、(3.12±1.53)μg/L],差异均有统计学意义(均P<0.05)。两组2型糖尿病患者性别、年龄、体质量、病程、高血压、吸烟、饮酒、空腹血糖、心率等一般资料比较,差异均无统计学意义(均P>0.05)。Spearman相关性分析结果显示,C-P、HbA1c与2型糖尿病周围神经病变呈正相关(r=0.895、0.870,P=0.010、0.016)。结论2型糖尿病周围神经病变患者HbA1c、C-P水平异常,HbA1c、C-P水平与2型糖尿病周围神经病变相关,可为指导临床早期诊断2型糖尿病周围神经病变并及早进行防治提供一定参考。
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:InthispaperweestablishsharpH¨olderestimatesofharmonicfunctionsonaclassofconnectedpostcriticallyfinite(p.c.f.)self-similarsets,andshowthatfunctionsinthedomainofLaplacianenjoythesameproperty.Somewell-knownexamples,suchastheSierpinskigasket,theunitinterval,thelevel3Sierpinskigasket,thehexagasket,the3-dimensionalSierpinskigasket,andtheVicseksetarealsoconsidered.