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Related Experiment Videos

Buoyant density variation during the cell cycle in microorganisms.

H E Kubitschek

    Critical Reviews in Microbiology
    |January 1, 1987
    PubMed
    Summary

    Cell buoyant density remains constant throughout the cell cycle in many organisms like bacteria and mammalian cells. This stability is regulated by osmoregulatory systems, suggesting conserved evolutionary mechanisms.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Evolutionary Biology

    Background:

    • Cell buoyant density is a biophysical property that can change during the cell cycle.
    • Understanding cell density regulation provides insights into cellular homeostasis and evolution.

    Purpose of the Study:

    • To investigate the behavior of cell buoyant density across the cell cycle in diverse cell types.
    • To determine if cell density regulation is conserved across different species and cell types.

    Main Methods:

    • Measurement of cell buoyant density using techniques like density gradient centrifugation.
    • Analysis of cell density variation during the cell cycle in bacteria, yeast, and mammalian cells.
    • Correlation of density changes with cell wall properties and growth conditions.

    Main Results:

    • Mean cell buoyant density was constant and independent of cell age in Escherichia coli, Schizosaccharomyces cerevisiae, Amoebae proteus, mouse lymphoma/myeloma cells, and Chinese hamster ovary cells.
    • Cells with thick cell walls (e.g., budding yeast, Streptococcus faecium) exhibited variable buoyant density during the cell cycle.
    • Cell buoyant density in E. coli is controlled by the osmoregulatory system, independent of growth rate.

    Conclusions:

    • Cell buoyant density is remarkably stable during the cell cycle in cells lacking heavy cell walls, indicating conserved regulatory mechanisms.
    • Osmoregulatory systems likely control cell buoyant density, suggesting evolutionary conservation or convergent evolution of these mechanisms.
    • The findings highlight the fundamental role of osmoregulation in maintaining cellular biophysical properties across diverse life forms.

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