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Biological clocks: endogenous cycles synchronized by subtle geophysical rhythms

F A Brown

    Bio Systems
    |July 1, 1976
    PubMed
    Summary

    Biological clocks are accurate endogenous cycles synchronized by geophysical cues. Organismic sensitivity to electromagnetic forces explains these rhythms and their varied frequencies.

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    Area of Science:

    • Chronobiology
    • Geophysics
    • Biophysics

    Background:

    • Biological clocks regulate endogenous cycles. Geophysical cues (Zeitgebers) synchronize these internal rhythms.
    • Organisms exhibit sensitivity to atmospheric electromagnetic forces, influencing biological timing.

    Purpose of the Study:

    • To provide a unified explanation for biological clocks and their timed rhythms.
    • To elucidate the role of electromagnetic forces and phase-response systems in biological timing.

    Main Methods:

    • Analysis of organismic sensitivity to atmospheric electromagnetic forces.
    • Examination of asymmetrical phase-response systems in biological clocks.
    • Modeling of endogenous cycles and their synchronization by geophysical Zeitgebers.

    Main Results:

    • A simple, unified explanation for biological clocks and their timed rhythms was developed.
    • Biological clocks were found to be accurate endogenous cycles synchronized by geophysical Zeitgebers.
    • Freely phase-labile rhythms were observed to autophase under constant conditions, generating diverse frequencies.

    Conclusions:

    • Organismic sensitivity to electromagnetic forces offers a unified explanation for biological clocks.
    • Geophysical Zeitgebers ensure the accuracy of endogenous biological clocks.
    • Phase-labile rhythms can generate multiple overt frequencies through autophasing.

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