spacer gif spacer gif spacer gif spacer gif Online submission spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

Right arrow Help viewing high resolution images
Right arrow Return to article

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.



Fig. 1. In vitro microperfusion of Malpighian tubules of the yellow fever mosquito, Aedes aegypti. (A) Perfusion of a tubule segment containing a stellate cell. (B) Perfusion of a tubule segment without stellate cells. The lumen of Malpighian tubules was cannulated with a double-barreled glass pipette for perfusion of the tubule lumen and for measurements of the transepithelial voltage (Vt) and resistance (Rt). Vl is the voltage measured at the distal end of the perfused segment. A current (I=50 nA) was injected into the tubule lumen when measurements of Rt were desired. BB, brush border; PC, principal cell; SC, stellate cell; SJ, septate junction. (C) Simple electrical equivalent circuit of transepithelial electrolyte transport across Malpighian tubules. Ec, electromotive force of the active transport pathway; I, intraepithelial current; Rc, transcellular resistance; Rsh, shunt resistance. Rt is the total resistance of Rc and Rsh in parallel.





Right arrow Return to article