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Spontaneous current pulses through developing fucoid eggs.

R Nuccitelli, L F Jaffe

    Proceedings of the National Academy of Sciences of the United States of America
    |December 1, 1974
    PubMed
    Summary
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    Researchers measured electrical currents in developing seaweed eggs using a new electrode. They discovered distinct pulsing and steady electrical currents that correlate with growth, differing from typical action potentials.

    Area of Science:

    • Developmental biology
    • Cellular electrophysiology
    • Marine biology

    Background:

    • Electrical currents play a role in cellular processes.
    • Understanding endogenous electrical currents is crucial for developmental studies.

    Purpose of the Study:

    • To measure and characterize electrical currents in developing Pelvetia eggs.
    • To investigate the relationship between electrical currents and embryonic growth.

    Main Methods:

    • Utilized a novel extracellular vibrating electrode for precise current measurement.
    • Studied Pelvetia eggs during the first two days of development.

    Main Results:

    • Identified both pulsing and steady endogenous electrical currents entering the egg's growing tip.

    Related Experiment Videos

  • Characterized current pulses (100 sec duration, 1-5/hr frequency, 3-30 muA/cm(2) intensity) that are not voltage-controlled.
  • Observed a direct proportionality between egg growth rate and steady current magnitude.

    • Conclusions:

    • The identified current pulses are distinct from action potentials.
    • Endogenous electrical currents are integral to early embryonic development and growth in Pelvetia.