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1.
The aim of this study is to further measure the effect of 632.8-nm helium-neon laser on fast excitatory postsynaptic potential (f-EPSP) of postganglionic neurons in isolated rat superior cervical ganglia by means of intracellular recording techniques. The neurons with f-EPSP were irradiated by different power densities (1 - 5 mW/cm2) laser. Irradiated by the 2-mW/cm2 laser, the amplitude of the f-EPSP could augment (P < 0.05, paired t test) and even cause action potential at the end of the first 1 - 2 minutes, the f-EPSP could descend and last for 3 8 minutes. But the amplitude of the f-EPSP of neurons irradiated by the 5-mW/cm2 laser could depress for the irradiating periods. The results show that: 1) the variation of the amplitude of f-EPSP caused by laser is power density-dependent and time-dependent; 2) there exist the second-order phases in the interaction of the helium-neon laser with neurons. These findings may provide certain evidence in explanation of the mechanisms of clinical helium-neon lase 相似文献
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刚架拱桥的病害原因与加固分析 总被引:2,自引:0,他引:2
通过对多座刚架拱桥的病害调查,全面分析刚架拱桥的常见病害并对其原因进行针对性分析.本文结合钦州钦江二桥的检测,对钦江二桥出现的病害加以分析,在此基础上提出加固方案,并为同种类型的刚架拱桥的加固提供依据. 相似文献
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应用细胞内生物电记录技术,观察神经肽P物质(SP)对大鼠星状神经节细胞的影响。SP在1μmol~10μmol或更高的浓度范围内,供试35个细胞,有28个细胞发生膜除极反应。用低钙(0.25mm)或用含河豚毒素(TTX,1μmol)克氏液灌流神经节,不影响SP引起的除极反应的幅度和时程。SP引起除极反应的同时常伴有膜电阻增大。当膜电位增大时,除极化反应幅度变小,反转电位为-80mV至-100mV。研究表明,SP对部分星状神经节细胞具有兴奋作用,使通过这些细胞的信息传递增强;SP对细胞膜的除极作用是由于其引起细胞膜钾导降低所致。 相似文献
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【目的】研究需求率为售价的指数函数,变质率服从三参数Weibull分布的订货与定价策略。【方法】系统以利润最大化为目标函数,考虑商品变质时带来的成本,引入价格折扣,构建了库存模型。【结果】采用直接法和泰勒展开式对模型进行近似求解,提供算例分析以得到问题的近似解,通过对折扣率、变质率灵敏度分析给出了相应的合理化管理建议。【结论】零售商在处理保鲜期后的商品时引入的价格折扣越高销量越大。商品的流动环境因子的增加会使得零售商成本增加,在销售过程中可采用更为先进的交通工具和储存手段。 相似文献
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这场令人陶醉的汽车“嘉年华会”终于落下了帷幕,每个人都在热衷于讨论它能留下些什么?靓车、美女、金钱、奢华、似乎都是主旋律,似乎又都不是关键字。有人辞官归故里,有人漏夜赶考场;态度各异的汽车厂商们,在以各自的方式和复杂的心态看待一年复一年的上海车展。上海车展,风一般刮过,给我们昭示的是中国车展市场三大独特的定律。 相似文献
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应用细胞内生物电记录技术,观察神经肽P物质(SP)对大鼠星状神经节细胞的影响.SP在1 μmol~10 μmol或更高的浓度范围内,供试35个细胞, 有28个细胞发生膜除极反应.用低钙(0.25 mm)或用含河豚毒素(TTX,1 μmol)克氏液灌流神经节,不影响SP引起的除极反应的幅度和时程.SP引起除极反应的同时常伴有膜电阻增大.当膜电位增大时,除极化反应幅度变小,反转电位为-80 mV至-100 mV.研究表明,SP对部分星状神经节细胞具有兴奋作用,使通过这些细胞的信息传递增强;SP对细胞膜的除极作用是由于其引起细胞膜钾导降低所致. 相似文献
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The aim of this study is to further measure the effect of 632.8-nm helium-neon laser on fast excitatory postsynaptic potential(f-EPSP)of postganglionic neurons in isolated rat superior cervical ganglia by means of intracellular recording techniques.The neurons with f-EPSP were irradiated by different power densities(1 - 5 mW/cm2)laser.Irradiated by the 2-mW/cm2 laser,the amplitude of the f-EPSP could augment(P < 0.05,paired t test)and even cause action potential at the end of the first 1 - 2 minutes,the f-EPSP could descend and last for 3 - 8 minutes.But the amplitude of the f-EPSP of neurons irradiated by the 5-mW/cm2 laser could depress for the irradiating periods.The results show that:1)the variation of the amplitude of f-EPSP caused by laser is power density-dependent and time-dependent; 2)there exist the second-order phases in the interaction of the helium-neon laser with neurons.These findings may provide certain evidence in explanation of the mechanisms of clinical helium-neon laser therapy. 相似文献
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