Reports

Hydrostatic pressure reversibly blocks membrane control of ciliary motility in Paramecium

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Science  19 Oct 1979:
Vol. 206, Issue 4416, pp. 358-361
DOI: 10.1126/science.482945

Abstract

A hydrostatic pressure of only 68 atmospheres prevented swimming Paramecium caudatum from "avoiding" or reversing direction; 170 atmospheres stopped or decreased forward velocity by more than 75 percent. A decompression of 40 atmospheres invoked a single reversal, even at ,80 atmospheres. In contrast, 170 atmospheres did not significantly affect swimming behavior of paramecium "models" that were reactivated in a solution containing adenosine triphosphate and magnesium ions after their membrane had been disrupted by Triton X-100.