蜚蠊棘-钟形感器冲动发放的适应  

THE ADAPTATION OF IMPULSE DISCHARGES IN THE SPINE-CAMPANIFORM SENSILLUM OF COCKROACH PERIPLANETA AMERICANA

作　　者：程会文[1] 周培爱[1] 周兴海 

机构地区：[1]北京大学生物学系,北京100871

出　　处：《生物物理学报》1993年第2期274-278,共5页Acta Biophysica Sinica

摘　　要：本实验研究蜚蠊后胸足胫节棘-钾形感器冲动发放的适应特性,用探针向棘窝方向推棘以兴奋感觉神经元,用胞外电极记录神经冲动的发放,显示明显的适应现象.用计算机对冲动信号进行分析作图可得时间-瞬时频率曲线,该曲线呈负幂函数分布并可用y=B(?)公式描述,其中k为回归系数,表示该感器的适应速率,棘移动距离可影响k值,棘移动距离越长,k值越大,表示适应速率减慢.高频率移动棘可使反应发生动态和稳态两方面的变化;前者显示后续反应的脉冲个数的减少,后者则显示k值的降低,意味着适应的加快.The adaptation of impulse discharges of the spine - campaniform sensillum on the tibia of cockroach (Peripianeta amencana ) metathoracic legs was studied. The spine was pushed by the probe towards the spine socket to excite the receptor neuron. The impluse discharges in the neuron were recorded by the extracellular electrodes. The evoked discharges showed the adaptation phenomenon clearly, especially during the stimulus was maintained.In analyzing the time-instantaneous frequency graph of the impulse signals, it was showed that the instantaneous frequencies decreased as a negative power function of the time. The relationship between instantaneous frequency and time could be described by the formula: v=Bt. in which k was a regression coefficient and related to adaptation rate.The adatation rate was influenced by the displacement of spine. The longer the displacement, the smaller the k value. l.e. the slower the adaptation rate. If the spine moved at high frequency, then both dynamic and stationary adaptation of the response could be effected: The former showed the decrease of the impulse number in successive responses and the latter showed the decrease of k value. so the adaptation rate was faster.

关 键 词：美洲蜚蠊 棘-钟形感器 适应 

分 类 号：Q969.250.7[生物学—昆虫学]