普罗帕酮对豚鼠心室肌细胞电生理的影响

目的:研究普罗帕酮对心室肌细胞的影响作用.方法:应用常规的玻璃微电极细胞内记录技术,观察普罗帕酮对豚鼠心室肌细胞的动作电位0相幅值(APA),最大除极速率(Vmax),动作电位时程(APD),50%复极化时间(D50),90%复极化时间(D90).结果:(1)用5μmol/L的普罗帕酮灌流后与正常对照组相比动作电位0幅值(APA)下降(P＜0.05),动作电位时程(APD)及50%复极化时间(D50)升高(P＜0.05),(3)用10μmol/L的普罗帕酮灌流后与正常对照组相比动作电位0幅值(APA)下降(P＜0.05),动作电位时程(APD)明显升高(P＜0.01),50%复极化时间(D50)及90%复极化时间(D90)升高(P＜0.05).结论:普罗帕酮能抑制心室肌细胞的动作电位0幅值,延长动作电位时程、最大除极速率及50%、90%复极化时间.     

苦参汤对豚鼠心室肌细胞电生理效应的影响

目的:探讨苦参汤对豚鼠心室肌细胞电生理效应的影响.方法:应用常规玻璃微电极细胞内记录技术,观察苦参汤对豚鼠心室肌细胞动作电位0相幅值(APA),动作电位时程(APD),50%复极化时间(APD50),90%复极化时间(APD90)的影响作用.结果:(1)用20mg/mL的苦参汤灌流后与正常对照组相比动作电位0相幅值(APA)下降(P<0.05),(2)用40mg/mL的苦参汤灌流后与正常对照组相比动作电位0幅值(APA)下降(P<0.05),50%复极化时间(APD50)下降(P<0.05),(3)用80mg/mL的苦参汤灌流后与正常对照组相比动作电位0幅值(APA)下降(P<0.01),50%复极化时间(APD50)下降(P<0.01),90%复极化时间(APD90)下降(P<0.05),10min左右达到最大效应.结论:苦参汤能抑制豚鼠心室肌细胞动作电位0幅值,缩短动作电位时程.     

去甲肾上腺素对豚鼠乳头肌动作电位的影响

目的:研究去甲肾上腺素(NE)对豚鼠心室乳头肌动作电位的影响.方法:采用玻璃微电极细胞内引导技术,记录离体豚鼠心室乳头肌动作电位,在此基础上,观察NE对豚鼠心室乳头肌动作电位的影响及酚妥拉明的拮抗作用.结果:100μmol/L NE可使乳头肌动作电位时程(APD)明显延长(P<0.05),动作电位复极50%和90%时间(APD50 and APD90)明显延长(P<0.05).而100μmol/L酚妥拉明可使延长的APD、APD50、APD90明显恢复.结论:去甲肾上腺素可明显延长豚鼠心室乳头肌动作电位时程,而酚妥拉明可阻断此效应.     

炙甘草汤对豚鼠离体心室乳头肌电生理效应的研究

目的：探讨炙甘草汤对豚鼠心室肌动作电位的影响。方法：用玻璃微电极细胞内记录的方法．描记正常和不同剂量炙甘草汤（10、20和40mg／m1）灌流时的豚鼠心室乳头肌细胞动作电位，测量其RP、APA、Vmax、APD50、APD90和APD。结果：20mg／ml炙甘草汤可明显缩短APD90（P〈O．05），40mg／ml炙甘草汤对APD50、APD90和APD均有明显缩短作用（P〈0．05或0．01）。结论：炙甘草汤可缩短豚鼠心室肌细胞动作电位的时程。     

氯化镍对家兔离体窦房结自律细胞的影响

目的:探讨氯化镍对家兔窦房结自律细胞的影响.方法:利用细胞内微电极记录技术,观察20例家兔窦房结细胞动作电位以及氯化镍对窦房结细胞动作电位产生的影响.结果:用180μmol/L NiCl2灌流后窦房结自律细胞的VDD、APA、Vmax、RPF均明显下降(P＜0.01),APD、APD90显著延长,MDP、APD50均无明显改变(P＞0.05).结论:氯化镍对窦房结自律细胞的动作电位0相和4相去极离子流有明显的抑制作用.     

炙甘草汤对豚鼠心室肌细胞的电生理影响

目的：研究炙甘草汤对豚鼠心室肌细胞电生理影响。方法：应用常规的玻璃微电极细胞内记录技术，观察炙甘草汤对豚鼠心室肌细胞的动作电位0相幅值（APA）。动作电位时程（APD），50％复极化时间（APD50），90％复极化时间（APD90）的影响。结果：（1）用20mg／ml的炙甘草汤灌流后与正常对照组相比细胞电生理变化不明显；（2）用40mg／ml的炙甘草汤灌流后与正常对照组相比动作电位时程（APD）缩短（P〈0．05），90％复极化时间（APD90）下降（P〈0．05）；（3）用80mg／ml的炙甘草汤灌流后与正常对照组相比动作电位时程（APD）明显缩短（P〈0.01），50％复极化时间（APD50）、90％复极化时间（APD90）下降（P〈0．05）。结论：炙甘草汤能缩短豚鼠心室肌细胞动作电位时程及50％、90％复极化时间。     

普罗帕酮对豚鼠左心室流出道慢反应自律细胞的电生理效应

目的:探讨普罗帕酮对左心室流出道自律细胞的电生理效应.方法:应用常规的玻璃微电极细胞内记录技术,观察普罗帕酮对豚鼠左心室流出道(主动脉前庭)动作电位0相幅值(APA),最大除极速率(Vmax),动作电位时程(APD),50%复极化时间(APD50),90%复极化时间(APD90),自发电活动频率(HR)的影响.结果:1.用0.5μmol/L的普罗帕酮灌流后与正常对照组相比自发电活动频率(HR)显著下降(P<0.01);2.用1μmol/L的普罗帕酮灌流后与对正常照组相比动作电位0幅值(APA)下降(P<0.05),动作电位时程(APD)延长(P<0.05).结论:普罗帕酮能抑制左心室流出道(主动脉前庭)的动作电位0幅值,延长动作电位时程,使自发电活动频率下降.     

肾上腺素对离体豚鼠左心室流出道组织自律性电活动的影响

目的:观察肾上腺素(E)对离体豚鼠左心室流出道组织自发慢反应电位的影响.方法:采用标准玻璃微电极细胞内记录技术,观察E对离体豚鼠左心室流出道组织自发慢反应电位的影响.观测指标有:最大舒张电位(MDP),动作电位幅度(APA),0期最大除极速度(Vmax),4期自动除极速度(VDD),自发放电频率(RPF),复极50%和90%时间(APD50、APD90).结果:用100μmol/L E灌流,豚鼠左心室流出道自律组织动作电位APA明显增大(P<0.01),Vmax明显增快(P<0.05),MDP显著增大(P<0.05),APD90显著缩短(P<0.01);RPF明显增快(P<0.01),VDD明显加快(P<0.05).结论:E对左心室流出道组织自律细胞有兴奋作用.     

H2S对兔左心室心肌细胞电生理特性的影响

目的:探讨硫化氢(H2S)对兔左心室心肌细胞电生理特性的影响.方法:用标准微电极细胞内记录技术,观测硫化氢对兔左心室心肌细胞电生理特性的影响.观测指标:静息电位(resting potential,RP)、超射值(over-shoot,OS)、动作电位幅值(amplitude of action po-tential,APA)、0相最大除极速率(maximal rate of depolarization,Vmax)、复极20%、50%和90%时间(20%、50%and 90% of duration of action potential,APD20、APD50and APD90)及复极化平均速度(average rate of repolarization).结果:(1)用50μmol/L NaHS 灌流时,和正常对照组相比,APD50、APD90缩短(P＜0.01),复极化平均速度增快(P<0.05).(2)100μmol/L NaHS与对照组比较,APD50、APD90缩短(P＜0.01),复极化平均速度增快(P<0.05).和50μmol/L NaHS相比APD50缩短(P＜0.01)、APD90缩短(P＜0.05)、复极化平均速度增快(P<0.05).(3)200μmol/L NaHS、400μmol/L、1 000μmol/L NaHS可浓度依赖性的使 APA、RP、OS减小(P<0.01),APD20、APD50、APD90缩短(P＜0.01),复极化平均速度增快(P<0.01).结论:H2S可浓度依赖性的影响兔左心室心肌细胞电生理特性.     

家鸽左心室流出道电生理特性的观察

目的 :探讨 4-AP对家鸽左心室流出道组织动作电位的影响。方法 :利用细胞内微电极记录技术 ,观察 1 2例家鸽左心室流出道组织的电生理特征 ,以分析 4 -AP对家鸽左心室流出道的作用。结果 :在局部组织记录到典型的慢反应动作电位 ;用 2mmol/L 4 -AP灌流后 ,慢反应电位RP、APA、Vmax均明显下降 (P <0 .0 5) ,而APD、APD90 也显著延长 ;APD50 无明显改变 (P >0 .0 5)。结论 :家鸽左心室流出道组织不同于普通心室肌组织 ;4-AP对家鸽左心室流出道组织慢反应动作电位去极和复极离子流有明显抑制作用     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…