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Related Experiment Videos

Intracellular diffusion of water.

J E Tanner

    Archives of Biochemistry and Biophysics
    |July 15, 1983
    PubMed
    Summary

    This study measured cell water diffusion using pulsed gradient NMR, revealing intracellular diffusion coefficients and membrane permeabilities for human red cells, yeast, and brine shrimp.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Nuclear Magnetic Resonance (NMR) Spectroscopy

    Background:

    • Understanding water transport across cell membranes is crucial for cell physiology.
    • Previous theoretical models provide a framework for analyzing diffusion data.

    Purpose of the Study:

    • To quantify the self-diffusion of water within various cell types.
    • To determine the water permeability of cell membranes.
    • To measure the self-diffusion coefficient of lipids in human adipose tissue.

    Main Methods:

    • Utilized pulsed gradient Nuclear Magnetic Resonance (NMR) techniques.
    • Employed a range of diffusion times from 0.3 milliseconds to 1.0 second.
    • Applied theoretical models for permeable planar barriers to analyze NMR data.

    Main Results:

    • Intracellular water diffusion coefficients varied from 1.2 x 10^-6 to 6 x 10^-6 cm²/s across samples.
    • Outer-membrane permeabilities to water ranged from 0.0001 to 0.01 cm/s.
    • The self-diffusion coefficient of lipid in human breast adipose tissue was measured at 1.5 x 10^-7 cm²/s.

    Conclusions:

    • Pulsed gradient NMR is effective for measuring water diffusion and membrane permeability in biological cells.
    • The determined coefficients provide quantitative insights into water dynamics and transport mechanisms.
    • Findings contribute to a deeper understanding of cellular water homeostasis and lipid dynamics.

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