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Science 13 March 1970:
Vol. 167. no. 3924, pp. 1497 - 1498
DOI: 10.1126/science.167.3924.1497
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Articles

Fluid Transport: Concentration of the Intercellular Compartment

Betty J. Wall 1, James L. Oschman 1, and Bodil Schmidt-Nielsen 1

1 Department of Biology, Case Western Reserve University, Cleveland, Ohio 44106

Intercellular spaces of Periplaneta rectal pads are visible at a magnification of x 100 and distend during fluid uptake. Samples (0.025 to 0.1 nanoliter) obtained by micropuncture from the spaces were consistently more concentrated than the fluid in the rectal lumen. This observation supports the hypothesis of "local" osmosis in epithelial fluid transport.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)