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Article: Modulation of Ca(2+)-activated K+ currents and Ca(2+)-dependent action potentials by exocytosis in goldfish bipolar cell terminals.

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Palmer MJ
J. Physiol. (Lond.), 2006


Table 1. Properties of APs and Vm in bipolar-cell terminals

Control Picrotoxin Nifedipine
Data values were obtained from 13 control terminals, eight terminals in the presence of picrotoxin (50 μm) and six terminals in the presence of picrotoxin plus nifedipine (100 μm). Spontaneous APs were observed with no injected current, and evoked APs were observed with ≤+4 pA of injected current. AP amplitude refers to the size of the largest (low-frequency) APs observed in each terminal. AP duration was the width of large APs at 50% of the maximum amplitude. Max Vm was the most positive potential reached during a current ramp from 0 to +25 pA. Min Vm was the most negative potential reached during a current ramp from 0 to −10 pA. No significant differences were observed between terminals in control conditions and in the presence of picrotoxin. Max Vm was significantly more positive in the presence of nifedipine (P < 0.01, compared with in the presence of picrotoxin).
Spontaneous APs 7/13 terminals 5/8 terminals 0/9 terminals
Evoked APs 13/13 terminals 8/8 terminals 0/9 terminals
AP threshold (mV) −63 ± 1 −63 ± 1
AP amplitude (mV)  28 ± 3  29 ± 4
AP duration (ms)  16 ± 1  17 ± 2
Max Vm (mV)  −33 ± 2  −33 ± 2   −6 ± 8*
Min Vm (mV) −118 ± 7  −135 ± 12 −119 ± 15

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Inferred neuron-electrophysiology data values

Neuron Type Neuron Description Ephys Prop Extracted Value Standardized Value Content Source
Retina bipolar cell spike threshold (mV) -63.0 ± 1.0 -63.0 (mV) Data Table
Retina bipolar cell spike amplitude (mV) 28.0 ± 3.0 28.0 (mV) Data Table
Retina bipolar cell spike width (ms) 16.0 ± 1.0 16.0 (ms) Data Table