QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by DOW, J. A. T. Search for Related Content PubMed Articles by DOW, J. A. T.

Journal of Experimental Biology 93,269-281 (1981)
Published by Company of Biologists 1981

Localization and Characterization of Water Uptake from the Midgut of the Locust, Schistocerca Gregaria

JULIAN A. T. DOW ¹

¹ Department of Zoology, Downing Street, Cambridge

1. Water, potassium and sodium fluxes were measured across various regions of the locust gut under in vitro internal perfusion.

2. The anterior caeca differed from the other gut regions, notably the posterior caeca, in being able to absorb water in the absence of an applied chemical or osmotic gradient.

3. Absorption of sodium from the caecal lumen was active, and inhibited by 2,4-DNP or ouabain.

4. Potassium was passively distributed across the caecal epithelium, and transmembrane fluxes were unaffected by toxins.

5. A model for caecal water uptake was advanced, in which passive fluxes of potassium and chloride from the KCl-rich luminal fluid, combined with active sodium uptake, drives water into the blood, thus concentrating solutes within the caecal lumen.