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Journal of Experimental Biology 50,541-546 (1969)
Published by Company of Biologists 1969

An active Reduction of Water Level in Insect Cuticle

P. W. WINSTON ¹ and J. W. L. BEAMENT ²

¹ Department of Biology, University of Colorado, Boulder, U.S.A.
² Department of Zoology, University of Cambridge, England

The water in cuticles excised from living cockroaches and locusts is not in osmotic equilibrium with their blood. It represents on average an osmotic pressure 15 atmospheres greater than the blood osmotic pressure. In the locust a cuticle in equilibrium with the blood would contain 60% more water. This is cited as evidence for the continuous expenditure of energy by the epidermal cell in regulating the water balance of the cuticle.

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