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Related Experiment Videos

Does Gonyaulax polyedra measure a week?

G Cornelissen, H Broda, F Halberg

    Cell Biophysics
    |February 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Gonyaulax polyedra exhibits 7-day (circaseptan) rhythms in luminescence, suggesting intercellular communication occurs at this frequency. Light shifts disrupt these rhythms, impacting cellular communication mechanisms.

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    Area of Science:

    • Chronobiology
    • Cellular Biology
    • Marine Biology

    Background:

    • Cell communication is crucial for unicellular organisms.
    • Gonyaulax polyedra displays circadian rhythms in luminescence.
    • Circaseptan rhythms have been observed in other unicellular organisms.

    Purpose of the Study:

    • To investigate cell communication in Gonyaulax polyedra.
    • To analyze the influence of light-dark shifts on circadian and circaseptan rhythms.
    • To explore potential circaseptan communication frequencies in G. polyedra.

    Main Methods:

    • Mixing cultures of Gonyaulax polyedra grown under different light regimens.
    • Applying an 11-hour light-dark (LD) shift to a fraction of a culture.
    • Comparing circadian glow rhythms under free-running conditions (LL) for unshifted, shifted, and mixed cultures.

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    Main Results:

    • A circaseptan modulation of circadian amplitude was detected in unshifted and some mixed cultures, but not in shifted cultures.
    • Mixed cultures showed a significantly lower circaseptan amplitude and acrophase advance compared to unshifted cultures.
    • These findings suggest Gonyaulax polyedra may communicate via a circaseptan frequency.

    Conclusions:

    • Gonyaulax polyedra exhibits both circadian and circaseptan rhythms.
    • Intercellular communication in G. polyedra may occur at a circaseptan frequency.
    • Further research is needed to understand the interplay between circadian and circaseptan rhythms and their role in cell communication.