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For some types of cells, it is convenient to apply both methods simultaneously to break the patch. The advantage of whole-cell patch clamp recording over sharp electrode technique recording is that the larger opening at the tip of the patch clamp electrode provides lower resistance and thus better electrical access to the inside of the cell.
The patch pipette is designed for whole cell recording so its opening diameter is larger than experiments done to examine single ion-channels. For the most part standard patch clamp protocols may be used although there are some small situation dependent modifications to the pipette and the internal solution.
A schematic of a patch clamp chip showing a gigaseal, whole cell recording configuration, and the ion channel and whole cell currents. Many types of systems have been developed for patch clamping cells in suspension cultures. One system uses a traditional pipette and cells in a droplet suspension culture to obtain patch clamp recordings (see ...
The hyperglycemic clamp, which requires maintaining a high blood sugar level by perfusion or infusion with glucose, is a way to quantify how fast beta-cells respond to glucose. The hyperinsulinemic clamp, which requires maintaining a high insulin level by perfusion or infusion with insulin, is a way to quantify how sensitive the tissue is to ...
Fig 1. Channelrhodopsin-2 (ChR2) induces temporally precise blue light-driven activity in rat prelimbic prefrontal cortical neurons. a) In vitro schematic (left) showing blue light delivery and whole-cell patch-clamp recording of light-evoked activity from a fluorescent CaMKllα::ChR2-EYFP expressing pyramidal neuron (right) in an acute brain slice.
The disposition index can be obtained on the basis of data that provide information on insulin sensitivity and beta cell function. Suitable sources include: Hyperglycemic glucose clamp investigations [6] Frequently-sampled intravenous glucose tolerance testing (IVGTT or FSIGT) [1] Frequently-sampled oral glucose tolerance testing (OGTT or FSOGT ...
This is a "patch-clamp electrode" (as distinct from a "sharp electrode" used to impale cells). This electrode is pressed against a cell membrane and suction is applied to pull the cell's membrane inside the electrode tip. The suction causes the cell to form a tight seal with the electrode (a "gigaohm seal", as the resistance is more than a ...
They used whole-cell patch recording in vivo and biophysical modeling in compartmental simulations of entorhinal stellate cells to examine the properties (SMPO), at different membrane potentials of the entorhinal cortex layer II stellate cells. [19] [7] [8] This technique incorporates electrical stimulation of polar molecules in cell membrane. [26]
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