目的:探讨腹主动脉缩窄致压力负荷增加大鼠心肌肥厚模型中核仁素的表达情况.方法:采用体质量180~220 g SD大鼠40只,随机分为假手术组和腹主动脉缩窄模型组,利用腹主动脉缩窄法制备压力负荷增加心肌肥厚模型,分别于术后2周、4周观察心...目的:探讨腹主动脉缩窄致压力负荷增加大鼠心肌肥厚模型中核仁素的表达情况.方法:采用体质量180~220 g SD大鼠40只,随机分为假手术组和腹主动脉缩窄模型组,利用腹主动脉缩窄法制备压力负荷增加心肌肥厚模型,分别于术后2周、4周观察心脏质量指数、左心室质量指数;采用RT-PCR检测心肌组织中β-MHC mRNA的表达;采用Western印迹检测心肌、脑、肾组织中核仁素的表达情况.结果:腹主动脉缩窄模型组4周以后心脏质量指数、左心室质量指数较假手术组显著增加(P<0.01);4周以后心肌组织中β-MHC mRNA的表达较假手术组显著升高(P<0.05);2周以后心肌组织中核仁素蛋白的表达较假手术组显著升高(P<0.05),而在脑、肾组织中无明显升高.结论:核仁素蛋白在大鼠压力负荷增加心肌肥厚模型中的表达上调,表明核仁素可能参与了压力负荷增加心肌肥厚的发生发展.展开更多
A pressing technique has become available that might be useful for compressing granular explosives. If the height diameter ratio of the charge is unfavorable,the high quality charge can not be obtained with the common...A pressing technique has become available that might be useful for compressing granular explosives. If the height diameter ratio of the charge is unfavorable,the high quality charge can not be obtained with the common single action pressing. This paper presents incremental pressing technique, which can obtain the charge with higher overall density and more uniform density.展开更多
文摘目的:探讨腹主动脉缩窄致压力负荷增加大鼠心肌肥厚模型中核仁素的表达情况.方法:采用体质量180~220 g SD大鼠40只,随机分为假手术组和腹主动脉缩窄模型组,利用腹主动脉缩窄法制备压力负荷增加心肌肥厚模型,分别于术后2周、4周观察心脏质量指数、左心室质量指数;采用RT-PCR检测心肌组织中β-MHC mRNA的表达;采用Western印迹检测心肌、脑、肾组织中核仁素的表达情况.结果:腹主动脉缩窄模型组4周以后心脏质量指数、左心室质量指数较假手术组显著增加(P<0.01);4周以后心肌组织中β-MHC mRNA的表达较假手术组显著升高(P<0.05);2周以后心肌组织中核仁素蛋白的表达较假手术组显著升高(P<0.05),而在脑、肾组织中无明显升高.结论:核仁素蛋白在大鼠压力负荷增加心肌肥厚模型中的表达上调,表明核仁素可能参与了压力负荷增加心肌肥厚的发生发展.
文摘A pressing technique has become available that might be useful for compressing granular explosives. If the height diameter ratio of the charge is unfavorable,the high quality charge can not be obtained with the common single action pressing. This paper presents incremental pressing technique, which can obtain the charge with higher overall density and more uniform density.