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Therefore sensitivity at a certain frequency (Sf) was quantified by processing the amplitude (A) of the fit, and the phase shift (ϕ) and the stimulus strength (Istim). , 1988). All data were normalized by setting the values for sensitivity and spontaneous spike activity of the initial control period for each experiment to 1. , 1981; Sudhof, 1995), we could not include a control period after the administration period. Effects of TeTx on the sensitivity of the electroreceptor organs. Scaling of the sensitivity (y-axis) is logarithmic.

The slopes of the curves represent the sensitivity. The values for sensitivity and spontaneous activity of the 3 experiments are given in table 2. The entire tree with all synapses, as simulated in experiment A is the most sensitive (472 Hz/nA). 3 Hz/nA. 6 Hz/nA), but the spontaneous activity is raised to 83 Hz. This increase in spontaneous activity is a result of the smaller area of membrane. The passive membrane of the dendritic tree contains ion channels with a reversal potential of –70 mV (table 1).

Traces are recorded before (Pre), and after 30 min administration of Cd2+ (Post). 01 Hz stimuli are depicted as gray lines. 4. Discussion In this paper, we showed that a positive (lumen inward) electrical stimulus induces Ca2+ mobilization in electroreceptor cells. This Ca2+ mobilization is associated with an increase in spike rate of the afferent nerve fiber. The calcium current can be inhibited by blocking Na+ as well as K+ channels. Although the involvement of Na+ 33 and K+ channels has been suggested many times, unto now there was only indirect evidence of ion currents in electroreception.

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