简介：目的探索不同f2/f1比值对DPOAEs幅值的影响,寻找最佳的测试参数,以得到最大的DPOAEs测值.方法对12例(24耳)正常青年人进行不同f2/f1比值条件下的DPOAEs幅值测试.结果当f1/f1=1.220时,DPOAEs幅值最大(P＜0.05或P＜0.01).当f2/f1=1.232时,除了f2=2002Hz处以外,其DPOAEs幅值与f2/f1=1.220时无显著性差异(P＞0.05).其他f2/f1值的DPOAEs幅值均较低,多数测值与f2/f1=1.220时相比均有显著性差异(P＜0.05或P＜0.01).结论f2/f1=1.220～1.232时,DPOAEs测值最大,此范围为最佳测试参数值.

简介：SincetheinventionofRubylaserbyMaimanin1960s,manykindsoflasersareusedwidelyindentistry.Ithasbeenprovedthatlaserirradiationcanproduceacidetchinglikesurface,thusstrengthenthebondofmaterialtoenamel.Buttheheatgeneratedduringirradiationproducesdamageondentalpulp,whichlimitsthelaserapplicationsondentalhardsurfaces.

简介：Objective:TodirectionallyclonetheomplgenefromChlamydiatrachomatis(Ct)FGenotypeontoaplasmidvectorforconstructingarudimentaryDNAvaccine.Methods:ThecompleteomplgenefromgenomicDNAofCtFgenotypewildspecieswasamplifiedwithprimersdesignedbycomputer.Therecombinantgenewasobtainedbyrestrictionenzymecutting,linkingthegenewiththeplasmidvectorinvitro,transformingtherecombinantgeneintobacteria,andextractingtheDNAfromthebacteria.Results:DNAextractingfromthebacteriawascomposedoftheimplgeneandplasmid,whichisidentifiedbythreemethodsofsingularrestrictiveenzymecutting,doublerestrictiveenzymecuttingandPCR.Conclusion:CloningoftheomplgenefromtheCtFgenotypemeansthatarudimentaryDNAvaccinewassuccessfullyconstructed.

简介：1950年,Magladery和MCDougal首先提出了F波(F—Waves)的概念,认为F波为周围神经接受电刺激后而出现的晚期肌肉反应。70年代后,许多学者对F波进行了研究,证实F波是周围神经接受超强

简介：Thehousedustmites(Dermatophagoidesfarinae,Derf)arethemajorsourceofaeroallergensimplicatedintheexpressionofatopicdisorders,includingasthma,allergicrhinitisandatopicdermatitis.Inparticular,strongcircumstantialevidencesuggeststhathousedustmiteantigensareimportantprecipitatingfactorsofasthma.Manyhousedustmiteallergensareproteasesthatcanelicitairwayinflammationbystimulatingthereleaseofcytokinesfrombronchialepithelialcells.ToinvestigatewhetherDerfallergenproteasesinducedcytokineproductionfromtheepithelialcelllineBEAS-2B,BEAS-2Bcellswereculturedwith4differentconcentrationsofDerf(0.02,0.2,2,20μg/ml)for24-96h,afterwhichsupernatantswereassayedforinterleukin(IL)-6andIL-8withELISA.Reversetranscription-PCRwasalsoperformed.ThecellsheetswereintactthroughouttheobservationincontrolgroupwithoutanyexposuretoDerfantigen.IntheexperimentalgroupscellstreatedwithDerfallergenshowedchangesintheanchoragestatusofthemonolayer.Therewasasignificantincreaseinthelevelofcytokineproductioncomparedwiththeuntreatedsample.ThereleaseofIL-6andIL-8increasedinaconcentration-dependentmanner(P<0.05,respectively)withtheadditionofincreasingdosageofDerftothecellsheets.LevelsofIL-6andIL-8begantoriseat24hand48hafterallergenexposure,andtheyincreasedsignificantlyinthesupematantsat72hand96h.AtthesametimetheconcentrationdependenceofinductionofIL-6andIL-8expressionaswellasanincreaseintheexpressionofIL-6andIL-8mRNAmanifestedevidently.HDM-inducedairwayinflammationmayincludeDerf-mediatedreleaseofinflammatorymediators,andtheproteolyticactivityofanallergenmaystimulatethereleaseofproinflammatorycytokinesfromhumanbronchialepithelium.ItissuggestedthatIL-6andIL-8productionbybronchialepithelialcellsmayplayaroleinthepathogenesisofallergicasthma.

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简介：1983、1994年的6-7月，连续两次在舒城县庐镇乡进行DDT室内滞留喷洒，第一次喷洒后，嗜人按蚊组成比和叮人率分别下降98.4%和99.5%，恶性疟发病率下降92.1%,第二次喷洒后直至1996年10月底，嗜人按蚊和恶性疟均消失；1985年6月，在该县洪庙乡（对照区）进行室内一次喷洒，亦取得了与两次喷洒相同的防治效果

简介：从重齿毛当归中进一步分得９个香豆素类化合物，它们是ｃｏｌｕｍｂｉａｎｅｄｉａｎ（１），ｏｓｔｈｏｌ（２），ｂｅｒｇａｐｔｅｎ（３），ｉｓｏｉｍｐｅｒａｔｅｒｉｎ（４），ｍｅｒａｎｚｉｎｈｙｄｒａｔｅ（５），ｎｏｄａｋｅｎｅｔｉｎ（６），ｍａｒｍｅｓｉｎｉｎ（７），ｃｏｌｕｍｂｉａｎｉｎ（８）和ａｎｇｅｌｉｄｉｏｌ（９）．其中，５～８为首次从该植物中分得，９为一新的天然产物。

简介：Objective:ToinvestigatetheexpressionofE2FandBcl-2andtheclinicopathologicalsignificanceinhepatocellularcarcinoma.Methods:TheexpressionsofE2F-3andBcl-2in74patientswithhepaticcarcinoma,paracarcinomaand15patientswithlivercirrhosisweredetectedbyS-Pimmunohistochemicalstaining.Results:TheexpressionofE2Finhepaticcarcinomawassignificantlyhigherthanthatinparacarcinomaorlivercirrhosis(P<0.005),theexpressionofBcl-2inhepaticcarcinomawassignificantlyhigherthanthatinparacarcinoma(P<0.005),inwhichBcl-2expressionwaslowerthaninlivercirrhosis(P<0.05).TheexpressionofE2F-3wasrelatedwithhistologicalgrade,tumorsize,andtheexpressionofBcl-2wasrelatedwithhistologicalgrade,tumorsizeandtumornumber.TherewascorrelationbetweentheexpressionofE2F-3andBcl-2inhepaticcarcinoma.Conclusion:E2F-3andBcl-2expressionmayplayanimportantroleindevelopment,progressionandcellapoptosisoftumor.

简介：<正>检测患者组68例和正常对照组50例。结果:所有患者肌电图(EMG)均呈广泛神经源性损害,神经传导速度(MCV)和运动神经末端潜伏期(DML)正常或轻度延长(P>0.05)。F波:58例F波出现率降低,7例F波消失,异常率95.6％;54例(79.4％)同时伴F波潜伏期离散度增大,为(7.8±4.5)ms;F波

简介：目的　探讨内蒙一起菌痢爆发的特异传染源。方法　对４３株Ｆ２ａ志贺菌进行质粒图谱和质粒ＤＮＡ酶切图谱分析。结果　①质粒图谱和质粒ＤＮＡ酶切图谱特征相同的菌株为引起本次菌痢爆发的优势克隆；②本次爆发偶合有部分散发病例；③经污染的食物传播是本次爆发的主要传播途径。结论　质粒分析能较为特异、敏感地揭示不同来源志贺菌间的遗传联系和差别，从而准确说明爆发或流行事件的真相

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简介：Objective:Tostudytheexpressionofactivatedepi-dermalgrowthfactorreceptor(EGFR)andtranscrip-tionfactorE2F(E2F)inCondylomaAccuminata(CA)patients.Methods:ImmunofluorescenttechniqueswereusedtoinvestigatetheexpressionofactivatedEGFRandE2FinCApatients.Results:TheexpressionofactivatedEGFRonthemembraneofepithelialcellsinCAlesionswassig-nificantlygreatercomparedtoexpressionleversinthecontrolgroup(P<0.01).Moreover,theco-expres-sionofactivatedEGFRandE2Fwassignificantlyin-creasedcomparedtothecontrolgroup(P<0.01).Conclusion:Ourobservationssuggestthatthein-creaseinactivatedEGFRexpressionmaystimulatehyperplasiainCApatientsthroughtheactivationoftranscriptionfactorE2F.

简介：Havingbeenpassedfor160generations,acelllinedesignatedasH22-F25/LwasestablishedfromamurinetumorlymphaticmetastatlcmodelH22-F25whichhadbeensetupinourcollege.Thecelllinewasinsuspensionculturewitharapidproliferationandstablegrowth.Thepeaktuneofcelldivisionandproliferationwas48and96hoursafterculture.Inaweek,thecellnumberwasIncreasedby25tunes.H22-F25/Lstillkeepsthefeaturesofapoorlydifferentiatedcancer.Itstumorinducingrate(invivo)was100%in615mice.Lymphnodemetastasisratewas50%andpulmonarymetastasisrate10%.H22-F25/LIsapopulationofheterogenetlctumorcellsIncluding2stemcelllines(themodelnumberofchromosomesbeing43in40%tumorcellsand86in32%)andsomesidelines.ThecommonmarkerchromosomesM1,M2,M3andM4werepresentinallstemandsidelines.

简介：肺癌的正确分期对肺癌治疗方案的制定具有重要的意义,以往根据胸片、胸部CT和B超等形态学检查手段作为分期的依据,但18F-FDGSPECT的应用,从功能诊断的角度,可发现许多过去形态学检查不能检测到的病灶,从而为肺癌的诊断和分期提供了新的方法.作者自2002年1月～2003年12月期间,发现5例临床确诊为肺癌,采用18F-FDGSPECT显像,发现经胸部CT检查未显像的肺癌多部位转移,现总结报道如下.

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简介：为了分析有免疫力的反应到老鼠的鼠科的hepatocarcinomaHca-F，与热吃惊使免疫(HSP70)蛋白质70源于elemene组合肿瘤Hca-F的房间疫苗(EC-TCV)，HSP70被自动数据处理从EC-TCV孤立亲密关系层析。老鼠intraperitoneally与HSP70被使免疫三次，怒气房间被取样。为房间，他们对Hca-F的增长和cytotoxicity与MTT试金被测量，他们的显型与流动cytometry被分析。有HSP70的使免疫的鼠标的怒气房间比与EC-TCV使免疫的鼠标的比正常控制鼠标，而是更少的有势力的对Hca-F和增长展出了更多的有势力cytotoxicity。在三个组之中，在与HSP70(35.5%)使免疫的老鼠的T淋巴细胞的百分比在正常老鼠与6.25%相比是最高的，并且28.4%与EC-TCV在老鼠使免疫。从EC-TCV导出的HSP70的免疫能得到有势力免疫者反应到Hca-F。HSP70是对Hca-F导致反肿瘤免疫者回答的元素之一。细胞与分子的免疫学。2006；3(4):291-295。

简介：目的:检测两个中国汉族人遗传性凝血因子Ⅻ缺陷症家系中的FⅫ基因突变.方法:检测先证者及家系成员血浆FⅫ:C.,并以其外周血单个核细胞中提取的基因组DNA为模板,PCR扩增FⅫ基因的所有外显子及其侧翼序列,用DNA测序仪检测FⅫ的基因突变.结果:在两个家系中共发现3种杂合型基因突变,即Gly526Asp、7142insertC和Glv542Ser.结论:上述3种FⅫ基因突变是导致中国人遗传性FⅫ缺陷的分子发病机制之一,且均为国际首次发现.

简介：为研究乳宁Ⅱ号方(主药:生黄芪、太子参、当归、枸杞、天门冬、淫羊藿、鹿角片、米仁、莪术、八月札、露蜂房、山慈菇)的作用机理,将体外培养的MA891细胞接种在小鼠右腋皮下,然后将小鼠分为生理盐水组(A)、环磷酰胺(CTX)组(B)、CTX+乳宁Ⅱ号组(C)、乳宁Ⅱ号组(D)、扶正组(E)、祛邪组(F).各组小鼠分别给予相当于临床成人用量2倍的上述各种药物治疗.21天后处死小鼠,运用免疫组化和PT-PCR方法观察各组小鼠乳腺癌血管内皮生长因子(VEGF)及其受体f1K-1蛋白和mRNA的变化.结果:B、D、C、E、F组都能减少VEGF、f1K-1蛋白和mRNA的表达,其中C组效果最好,D组次之.提示:抑制VEGF、f1K-1的表达,从而抑制肿瘤的血管生成,可能是乳宁Ⅱ号的作用机理之一;乳宁Ⅱ号与化疗药CTX有协同作用.