Coupled biochemical reactions that act as sources of this quantity are modeled as Gerischer elements. The transepithelial form of this quantity is a common measure of tight junction barrier integrity. (15[1]-5[2])Gigaseals are omega-shaped regions of cell membranes for which this quantity is on the scale (-5[1])of 10^9 in SI units. The change in this quantity is proportional to cell volume in the mechanism of a Coulter counter. A sucrose gap creates a region where this quantity is high in an alternative to (*) patch clamping. (-5[2])The reciprocal of this quantity, (-5[1])written lowercase g, sometimes names the Hodgkin-Huxley (10[1])model. (-5[1])Myelin increases (-5[1])this electrical quantity across the (-5[1])axolemma (10[1]-5[1])while decreasing capacitance, thus allowing for saltatory (-5[1])conduction. For 10 points, name this quantity equal to resistivity times thickness over cross-sectional area, or voltage over current. (10[9]0[2])■END■