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Ionic currents traverse the slime mould physarum

F Achenbach, M H Weisenseel

    Cell Biology International Reports
    |April 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    Physarum polycephalum generates electric currents that flow into protrusions and out of smooth areas in drops, and into strands and out of advancing/retracting ends in plasmodia. These ionic currents suggest significant changes in membrane properties during development.

    Area of Science:

    • Cellular Electrophysiology
    • Biophysics of Slime Molds

    Background:

    • Physarum polycephalum is a model organism for studying protoplasmic streaming and cellular electrical phenomena.
    • Understanding self-generated electric currents in biological systems is crucial for deciphering cellular communication and development.

    Purpose of the Study:

    • To investigate the characteristics and spatial distribution of self-generated electric currents in Physarum polycephalum.
    • To correlate electrical current patterns with the morphology of protoplasmic drops and plasmodia.

    Main Methods:

    • Utilized an extracellularly measuring vibrating electrode to detect ionic currents.
    • Measured current density in protoplasmic drops and monopodial plasmodia of Physarum polycephalum.

    Main Results:

    Related Experiment Videos

    • Observed ionic currents with densities up to 15 microamperes/cm² in Physarum polycephalum.
    • In protoplasmic drops, current entered protrusions and exited smooth surfaces.
    • In monopodial plasmodia, current entered the strand and exited the advancing front and retracting end.

    Conclusions:

    • The distinct current patterns in drops versus plasmodia indicate significant alterations in membrane properties or arrangement during development.
    • Electric current flow is spatially organized and linked to the dynamic morphological changes in Physarum polycephalum.