ECB-ART-41348
J Gen Physiol
1935 May 20;185:739-42. doi: 10.1085/jgp.18.5.739.
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ON REVERSAL OF GEOTROPISM IN ASTERINA.
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A certain level of strychninization induces in Asterina reversal of geotropism from the normally geonegative movement to a persistent downward creeping. The effect of an attached float producing upward pull is to induce upward creeping, under these conditions, whereas normally it leads to downward movement. This reversal cannot be regarded as due to a mere intensification of the sensory effect of tension. It must be understood as representing a true reversal of inhibition. The temporary reversal of geotropism following mechanical disturbances (in the absence of strychnine) is interpreted in the same way.
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