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Figure 11


Fig. 11. Estimates of electrophysiological variables in the Malpighian tubule of the yellow fever mosquito. All values are normalized to cm tubule length. (A) The tubule modeled as a single cable (data from Pannabecker et al., 1992). The radial resistance is the transepithelial resistance consisting of the resistances of the apical membrane Ra, basolateral membrane Rbl and the shunt Rsh. The axial resistance of the tubule is the core resistance Rco. (B) The tubule modeled as a double cable. Here the axial resistance consists of the lumen resistance Rlu and the gap-junction resistance Rgap. In both models the transepithelial voltage Vt and the basolateral (Vbl) and apical (Va) membrane voltages are the same. E, electromotive force; De is the electrical diameter of the tubule lumen calculated from the lumen resistance Rlu (Pannabecker et al., 1992).





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