The Journal of General Physiology
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The Journal of General Physiology, Vol 15, 487-489, Copyright © 1932 by The Rockefeller University Press

ARTICLE

ON "REVERSAL" OF PHOTOTROPISM IN PHYCOMYCES

E. S. Castle 1

1 From the Laboratory of General Physiology, Harvard University, Cambridge

Alleged reversal of the phototropism of the sporangiophores of Phycomyces by high intensities of light does not occur if infra-red radiation is properly excluded. Phototropic "indifference" alone occurs at high intensities due to equal photic action on both sides of the sporangiophore. If heat radiation is not screened out, a gradual, negative thermotropic bending takes place.

Accepted on February 12, 1932


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