Over a range of negative membrane potentials, approximately 10% of the current through NMDA channels was carried by calcium which, in the absence of the magnesium block, has an approximately linear I-V-relationship through the range of physiological voltages [48], [49], [50], [51].
The weights were chosen by manual inspection such that the normalized SDF contributed typically approximately 90%, the integral of the SDF about 9% and the moving average of the membrane potential about 1% to the overall cost.
For example, oocytes that express Kv7.2/3 have a membrane potential of approximately −60 mV, which corresponds to the threshold for activation of Kv7.2/3.
Intracellular recording from the RTC was identifiable by: a) a drop to resting membrane potential of approximately −60 mV; b) the full-wave rectification of the signal; c) depolarizing responses of 10 15 mV (graded), with ∼10 mV spikelets.
Measured neuronal resting membrane potential is approximately −65 to −75 mV.
Using current clamp mode, the cells were injected with currents to hyperpolarize the membrane potential to approximately − 100 mV for 1 s.
Whereas IK,n sets the IHC resting membrane potential at approximately −70 mV, both IK,f and IK,s contribute to repolarization of the RP, yet IK,f does so with a faster activation time constant (<1 ms) than IK,s (≥8 ms) (4, 5).
In the present work, we observed that the peptide BTM-P1d, similarly to BTM-P1, caused permeabilization of the RBC with artificially generated high membrane potential (−85 mV approximately [ 28]), whereas it did not permeabilize normal cells with a very low membrane potential (−10 mV approximately, see [ 28] for references).
A small constant hyperpolarizing current was injected during recording, immediately after break-in, to bring the membrane potential of neurons to approximately −60 mV.
At the resting membrane potential of the PM (typically approximately −60 mV), most of these channels will not be inactivated and can open during transient depolarizations.
