小鼠输精管交感神经冲动长串发放期间量子分泌的统计
Statistics of quantal secretion during long trains of sympathetic nerve impulses in mouse vas deferens.
作者信息
Karunanithi S, Phipps M C, Robinson J, Bennett M R
机构信息
Department of Physiology, University of Sydney, NSW, Australia.
出版信息
J Physiol. 1995 Nov 15;489 ( Pt 1)(Pt 1):171-81. doi: 10.1113/jphysiol.1995.sp021039.
Abstract
- A statistical analysis has been made of the occurrence of excitatory junctional currents (EJCs) of similar amplitude recorded with an extracellular electrode during long trains of nerve impulses to the mouse vas deferens. 2. The number of EJCs of similar amplitude that occurred in consecutive impulses during trains of 500-1000 impulses at 0.5-2.0 Hz increased with the number of EJCs evoked during the train. 3. There was no evidence of significant dependence between consecutive EJCs of similar amplitude in sixteen out of eighteen trains in eighteen preparations. 4. The time course of clusters of EJCs of similar amplitude was examined by determining the standard deviation of different groups of EJCs within a cluster throughout their time course. Most EJCs within a cluster could be grouped with a coefficient of variation < 0.1 throughout their time course. 5. The observations on EJCs of similar amplitude leave open the possibility that secretion from single varicosities is, in general, multiquantal.
摘要
- 对用细胞外电极记录的、在向小鼠输精管施加长时间神经冲动序列期间出现的类似幅度的兴奋性突触后电流（EJC）进行了统计分析。2. 在0.5 - 2.0 Hz频率下施加500 - 1000次冲动序列时，连续冲动中出现的类似幅度的EJC数量随该序列中诱发的EJC数量增加而增加。3. 在18个标本中的18个序列里，有16个序列中类似幅度的连续EJC之间没有显著依赖性的证据。4. 通过确定一个簇内不同组EJC在其整个时间进程中的标准差，来检查类似幅度的EJC簇的时间进程。一个簇内的大多数EJC在其整个时间进程中可以以变异系数< 0.1进行分组。5. 关于类似幅度的EJC的观察结果并未排除这样一种可能性，即一般来说，单个曲张体的分泌是多量子的。
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