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Science 5 May 1972:
Vol. 176. no. 4034, pp. 523 - 524
DOI: 10.1126/science.176.4034.523
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Articles

Reactivated Triton-Extracted Models of Paramecium: Modification of Ciliary Movement by Calcium Ions

Yutaka Naitoh 1 and Hiroki Kaneko 1

1 Zoological Institute, Faculty of Science, University of Tokyo, Tokyo, Japan

Triton-extracted models of Paramecium were reactivated to swim in solutions of adenosine triphosphate and magnesium ions. The cilia beat in the normal direction (toward the rear) when the calcium ion concentration was less than 10-6M, and they beat in the "reversed" direction (toward the front) when calcium ion concentration was raised above 10-6M. These results support the proposal that ciliary reversal, hence backward swimming, of live paramecia is mediated by an increased cytoplasmic calcium concentration around the ciliary system by calcium-dependent membrane responses to external stimuli.


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