Phototaxis

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Phototaxis (Biol) The influence of light on the movements of low organisms, as various infusorians, the zoöspores of certain algæ, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis.
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Century Dictionary and Cyclopedia
    • n phototaxis In botany, the taking by certain organisms or organs of a definite position with reference to the direction of the incident rays of light, as when the zoöspores of various plants (Hæmatococcus, Ulothrix, etc.) place their long axes parallel to the direction of the incident rays.
    • n phototaxis In biology, active migration of organisms, or of cells, in the line of rays of light affecting them — positive phototaxis if toward the source of light, and negative phototaxis if away from it. Compare photopathy.
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Etymology

Webster's Revised Unabridged Dictionary
NL. phototaxis,; photo-, + Gr. an arranging

Usage


In science:

The swimming direction of the cells can be controlled by stimulus gradients, a phenomenon known as taxis, such as chemotaxis, rheotaxis or phototaxis.
The random walk of a low-Reynolds-number swimmer
The imaged cells were located 30 to 60 micrometers from the glass walls. A red light filter was used in order to prevent phototaxis.
The random walk of a low-Reynolds-number swimmer
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