Direct Test of the Positive Pressure Gradient Theory of Pseudopod Extension and Retraction in Amoebae

See allHide authors and affiliations

Science  17 Dec 1971:
Vol. 174, Issue 4015, pp. 1237-1240
DOI: 10.1126/science.174.4015.1237


When one pseudopod of an amoeba is sucked into a capillary connected to a partial vacuum and subjected to a pressure reduction of 30 to 35 centimeters of water, extension of other pseudopods, exposed to atmospheric pressure, is not prevented. This result is interpreted to mean that cytoplasmic streaming cannot be the result of a positive pressure gradient generated along the length of the stream, for if it were, streaming would have reversed its direction under the applied pressure gradient of opposite sign and supposedly greater magnitude.