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Effect of external factors on phototaxis of Chlamydomonas reinhardtii

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Abstract

  1. 1.

    A fully automated phototaxis monitoring device is described for measuring photo-topatactic responses of flagellated organisms.

  2. 2.

    Photokinesis can be demonstrated in Chlamydomonas cells only after a dark period of about 72 hrs.

  3. 3.

    Pre-darkening of a few hours duration raises the phototactic disposition, whereas pre-illumination has no significant effect.

  4. 4.

    Circadian rhythms can be initiated by only one period of darkness or lower light intensity, whereas a period of higher intensity does not induce rhythms. The period length of the circadian rhythms is about 24 hrs.

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Nultsch, W., Throm, G. Effect of external factors on phototaxis of Chlamydomonas reinhardtii . Arch. Microbiol. 103, 175–179 (1975). https://doi.org/10.1007/BF00436346

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  • DOI: https://doi.org/10.1007/BF00436346

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