The Journal of General Physiology
Axon Instruments microelectrode amplifiers
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The Journal of General Physiology, Vol 18, 369-375, Copyright © 1935 by The Rockefeller University Press

ARTICLE

POSITIVE VARIATIONS IN NITELLA

W. J. V. Osterhout 1 and S. E. Hill 1

1 From the Laboratories of The Rockefeller Institute for Medical Research

The reversible electrical variations hitherto described for plants and animals consist in a reversible loss of positive potential at a stimulated spot by which it becomes more negative.

In this paper we describe changes which consist in a reversible loss of negative potential at a stimulated spot whereby it becomes more positive. We suggest that this be called a positive variation.

The stimulation was produced in all cases by pinching or bending the cell. This produced a compression wave which traveled along the cell, producing a negative variation at a spot which was positive and a positive variation at a spot which was negative (due to application of 0.1 M KCl).

The response produced by the compression wave differs in several respects from an ordinary propagated negative variation and may be termed a positive mechanical variation.

Accepted on May 14, 1934


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