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500 个结果
  • 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.

  • 标签: 心脏肥大 动脉结扎 钙元素 外科手术
  • 简介:ObjectivesTheeffectsofcarvediloloncalciumcurrent(ICa)wereinvestigatedinisolatedadultratventricularmyocytes.MethodsICawasrecordedbyusingwhole-cellpatch-clamprecordingtechnique.ResultsCarvedilolreversiblyinhibitedICainaconcentration-dependentmanner,carvedilolat0.1,0.3,1and10μmol/LintheextracellularsolutiondecreasedpeakICaby1.52%,18.04%,37.34%and72.18%,respectively.Thesteady-stateinactivationcurveofICawasshiftedtomorenegativepotentials,whiletheactivationcurvewasnotaltered.Therecoveryfrominactivationwasshiftedtorightdirection,itcouldnotberecoveredcompletely.Inaddition,Pretreatmentofventricularmyocyteswithprazosinandpropranololcouldn'tblockthecarvedilol-inducedreductionofICa.ConclusionsCarvedilolinhibitsICainadultratventricularmyocytesbymechanismsinvolvingpreferentialinteractionwiththeinactivatedstateofcalciumchannel.

  • 标签: CA^2+通道 小鼠 心肌细胞 卡维地洛 药物治疗
  • 简介:ObjectivesToinvestigateeffectofAngll,captoprilonsingleguineamyocytesonL-typecalciumcurrentandsodiumcurrent.MethodsMembranepatchclampwholecellrecordingtechniquewasusedtoinvestigateeffectofangll,captoprilonL-Camaximumcurrentdensityandsodiummaximumcurrentdensity.ResutlsAngllincreasedthemaximumcurrentdensitycomparedwithcontrolafterperfused5min,357.7±219.7Vs279.5±240.5PA/PF,increaserateis27.9%,theshapeofcurrent-voltagerelationshipcurvewasunchanged,peakedat+10mv,indicatedthatangllincreasedL-Cacurrentdensityinvoltage-dependent.Afterperfusedwithcaptopril,captopril+angll3,5min,L-Cacurrentwasrecorded,resultssuggestL-Camaximumcurrentdensitydecreasedsignificantlycomparedwithcontrol,incaptoprilgroup,128.4±92.6Vs286.2±89.7,66.7±68.3Vs286.2±89.7,respectively,rateofinhibitionis55.1%,76.6%,respectively.L-Cacurrentfurtherdecreasedincaptoprilpe

  • 标签: Membrane PATCH clamp IL - Ca
  • 简介:试验性的测试被进行评估L类型poddedpropulsor的水动力学性能在直向前,用一台开水的测量仪器的运动和离开设计条件为poddedpropulsors由作者发展了,拖引坦克的一个轮船模型,并且在水粒子图象velocimetry(PIV)下面测量系统。在条件的三种类型下面,L类型poddedpropulsor的主要参数被测量,包括推进器戳和转矩,以及整个豆荚单位的戳,方面力量,和时刻。另外,在推进器和神气之间的节上的流动领域被分析。试验性的结果证明动态azimuthing率和方向和转弯的方向在推进器和整个豆荚单位上影响力量。因为推进器旋转的效果,力量不均匀地在左、正确的azimuthing方向之间被散布。这研究的调查结果为关于L类型poddedpropulsors的进一步的研究提供一个基础。

  • 标签: 流体力学实验 吊舱推进器 直线运动 非设计工况 L型 粒子图像测速技术
  • 简介:InthispaperitturnsoutthataBanachlatticeXisorderisomorphictol~1(Γ)forsomenonemptysetΓiffitisaSchurspaceandalltheinfinitelydimensional,separableandclosedidealsofXareorderisomorphic.

  • 标签: ISOMORPHIC nonempty INFINITELY SEPARABLE proof TURNS
  • 简介:SomeKKMtheoremsandcoincidencetheoremsinvolvingadmissibleset-valuedmappingsandtheset-valuedmappingswithcompactlylocalintersectionpropertyareprovedinL-convexspaces.Asapplications,somenewfixedpointtheoremsareobtainedinL-convexspaces.Thesetheoremsimproveandgeneralizemanyimportantknownresultsinrecentliterature.

  • 标签: KKM TYPE THEOREM COINCIDENCE THEOREM L-convex
  • 简介:ProblemsaboutsurfacemountingprocessforfinepitchdevicesandreasonsonsolderbridgingofLtypeleaddevicesweldedaredepicted.Bridgingmechanismandinfluencefactorsareanalyzedwithtwo-dimensionalgeometricmodel.Basedonthis,high-densitysurfacemounttechnology(SMT)forfinepitchLtypeleaddevicesheatedbyscan-ninglaserisraised.SurfacemountprocessforQFP208onprintedcircuitboard(PCB)isstudied.Theresultsoftestsarethatitisquitepossibletosolvethesolderbridgingofsurfacemountingforpitchdeviceswithscanninglaser-heat-ingmethod.

  • 标签: Surface MOUNT TECHNOLOGY (SMT) DEFECT BRIDGING
  • 简介:BackgroundAtrialfibrillation(AF)isthemostcommonsustainedcardiacarrhythmiawithouteffectivetreatment.AFisassociatedwithatrialconductiondisturbancescausedbyelectricaland/orstructuralremodel-ing.Buttheroleofconnexin(Cx)43intheregulationofLtypecalciumchannel(LCC)remainsunclear.WehypothesizedthatCx43mightco-localizeandregulatetheLtypecalciumchannelcurrent(ICa,L).MethodsReal-timePCRandwhole-cellpatchclampwereusedtodetecttheexpressionofLCC1csubunitandthecurrentdensityofICa,L,beforeandafterCx43knockingdownrespectively.Theco-localizationofCx43withLCCwasinvestigatedbyco-immunoprecipitationandconfocalmicroscopy.ResultsKnockingdownofCx43significantlyinhibitedthecurrentdensityofICa,LthroughdecreasingthegeneexpressionofLCCα1cinculturedatrium-derivedmyocytes(HL-1cells).Cx43co-localizedwithLCCα1csubunitinatrialmyocytes.ConclusionsCx43regulatestheICa,LinatrialmyoctyesthroughLCC,representingapotentialpathogenicmechanisminatrialarrhythmias.

  • 标签: 间隙连接蛋白43 L型钙通道 电流密度 肌细胞 心房 实时荧光定量PCR
  • 简介:ObjectivesToevaluateantihypertensiveefficiencyandsafetyofanewdomesticofL-&N-typeCa^2+antagonist-eilnidipinewithimidaprilasapositivecontrol.MethodsAfter2weeks'placebowashingout,22patientsweretreatedwitheilnidipine5mgdailyand27patientsweretreatedwithimidapril5mgdaily.4weekslater,ifpatient'ssittingdiastolicbloodpressureisover90mmHg,his/herdosagewasdoubledforanother4weeks,theothersmeasuringupremainedtheirdosageunchangedforanother4weeks.Bloodpressure,heartrate,bloodandurineroutineexamination,serumglucose,serumchemicalexaminationincludingtotalcholesterol,triglyceride,HDL,LDL,transaminase,creatineetcandsidereactionswererecordedbeforeandafterthetrial.Datawereanalyzedstatistically.ResultsAfter8weeks'treatment,bloodpressurewassignificantlydecreased(P<0.05)inbothgroups,andthetwomedicineshadsimilarantihypertensiveeffects.Furthermore,thereducingofheartratewasstatisticallysignificantcomparedwithbaseline(P<0.01)inthecilnidipinegroup,butnotintheimidaprilgroup.Thenegativechronotropiceffectofcilnidipinehadlittleeffectoncontinuingthetherapy.Therewerenochangesonbloodandurineroutineexaminationandserumlipid,serumglucose,creatine,transaminaseandetcinbothgroups.Theirsidereactionsweremildandwell-tolerated.ConclusionsCilnidipinehasacon-vincingantihypertensiveeffectsimilartothatofimi-dapril.Especiallycilnidipinemaybeadministeredtopatientswithrelativelymildtachycardia.

  • 标签: 钙拮抗剂 西尼地平 抗高血压药物 药物不良反应
  • 简介:Thestudyofthetriplejunctionsofthegrainboundariesinsomefccsolidsolutions,orderedalloysandintermetallicswithL12hasbeencarriedoutusingtheopticalmetallographyandTEMmethods.Two-typesofthetriplejunctionswerefoundinthealloysinvestigated(1),consistingoftheboundariesoftherandom(RT),and(2),consistingoftheRTboundaryandthespecialboundaries(ST).TherelativevaluesoftheRTandSTboundaryenergyweredeterminedonthebasisofthemeasurementsoftheanglesbetweenthegrainboundaryplanes.IthasbeenshownthattheenergyofSTboundariesincreaseswiththeincreaseofthestackingfault(SF)energy.TheenergyoftheRTboundariesdoesnotdependontheSFenergy.

  • 标签: 合金学 颗粒边界能量 稳定性 离子
  • 简介:SONY也出宽屏幕笔记本了.你相信吗?一向给人以“固执”示人的SONY也禁不住市场的诱惑.推出旗下的第一款宽屏幕笔记本A系列。到目前为止全球十几家笔记本大厂只有IBM的ThinkPad系列还未推出宽屏摹了。此次,A系列一共推出15英寸.15.4英寸和17英寸三款不同的型号.而17英寸将凭借超大的屏幕和不俗的配置.成为A系列乃至整个SONY笔记本中的旗舰机型。

  • 标签: SONY公司 性能 VAIO TYPE A 宽屏幕
  • 简介:基于目标,产品由gasoline-typeand生产了的这篇文章芳香类型连续催化改过(CCR)单位在这些催化改过单位的技术指示物上做一个评价。这篇文章也为最大化汽油类型和芳香类型的CCR单位关于催化剂,化工物品的优化和优化操作政体的选择交付的目标产品探索技术措施。

  • 标签: 芳香族化合物 汽油给料 催化重整 最优化