Search results
Results from the WOW.Com Content Network
It can be used to measure the thermally stimulated depolarization of molecules within a material. One method of doing so is to place the material between two electrodes, cool the material in the presence of an external electric field, remove the field once a desired temperature has been reached, and measure the current between the electrodes as ...
In such cases, stimulation protocols that utilize the rheobase and assume that spiking rates are proportional to the rheobase will produce nonsense results (e.g. spike rate in response to 2X rheobase will not be greater than at 1.5X rheobase). Bursting cells. Bursting cells will produce multiple spikes once activated. For such cells, it can be ...
A variation potential, like an action potential, is a temporary change in the membrane potential of the plant cell by depolarization and consequent repolarization. However, it is distinguished by its slower, delayed repolarization phase, variability in shape and amplitude, and the decrease in its velocity with increasing distance from the ...
Possibly resulting from the depolarization of the S 4 segments and the little time given for inactivation. For long duration DPP's the III and IV domains of the sodium channels (discussed above) are given more time to bind with their respective channel pores, thus the threshold current is observed to increase with an increasing DPP duration. [2]
Thermally stimulated current (TSC) spectroscopy (not to be confused with thermally stimulated depolarization current) is an experimental technique which is used to study energy levels in semiconductors or insulators (organic or inorganic). Energy levels are first filled either by optical or electrical injection usually at a relatively low ...
Depolarization is essential to the function of many cells, communication between cells, and the overall physiology of an organism. Action potential in a neuron, showing depolarization, in which the cell's internal charge becomes less negative (more positive), and repolarization, where the internal charge returns to a more negative value.
The basis is that at a certain level of depolarization, when the currents are equal and opposite in an unstable manner, any further entry of positive charge generates an action potential. This specific value of depolarization (in mV) is otherwise known as the threshold potential.
When, at the end of a sinoatrial action potential, the membrane repolarizes below the I f threshold (about −40/−50 mV), the funny current is activated and supplies inward current, which is responsible for starting the diastolic depolarization phase (DD); by this mechanism, the funny current controls the rate of spontaneous activity of ...