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首页> 美国卫生研究院文献>Biophysical Journal >Frequency domain analysis of electrotonic coupling between leech Retzius cells.
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Frequency domain analysis of electrotonic coupling between leech Retzius cells.

机译：水echRetzius细胞之间的电声耦合的频域分析。

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摘要

Transfer functions of the input impedance Z(f) and coupling ratio H(f) were measured from the paired Retzius cells of leech segmental ganglia, using sinusoidal and pseudorandom test test currents. The data were compared with two classes of linear electric circuit models of electrotonic coupling, one with a purely resistive junction, and the other with a finite equivalent cable coupling the two somata. Model simulations suggested the phase behavior of the coupling ratio as a sensitive discriminator between these two cases. For resistive coupling, the phase of the coupling ratio asymptotically approaches -90 degrees at high frequencies, while for a cable segment, at least 0.5 length constants in length, it crosses -90 degrees with a definite negative slope and continues to more negative values. Measured phase lags of the coupling ratio in Retzius cell preparations consistently exceeded -90 degrees at frequencies above 50 Hz, and phase plots crossed -90 degrees with significantly negative slopes. We conclude therefore that a significant cable segment contributes to the coupling between Retzius cell somata.
机译：使用正弦和伪随机测试测试电流，从成对的水segment节神经节的Retzius细胞中测量输入阻抗Z（f）和耦合比H（f）的传递函数。将数据与两类电声耦合线性电路模型进行了比较，一类具有纯电阻性结，另一类具有有限等效电缆耦合了两个躯体。模型仿真表明，在这两种情况之间，耦合比的相位行为是敏感的判别器。对于电阻耦合，耦合比的相位在高频下渐近接近-90度，而对于电缆段，长度至少为0.5的长度常数，它以确定的负斜率跨过-90度并继续为负值。在高于50 Hz的频率下，在Retzius细胞制备物中测得的耦合比相位滞后始终超过-90度，并且相位图越过-90度具有明显的负斜率。因此，我们得出结论，一个重要的电缆段有助于Retzius细胞体之间的耦合。

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