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Nonequilibrium facilitated oxygen transport in hemoglobin solution.

H Kutchai, J A Jacquez, F J Mather

    Biophysical Journal
    |January 1, 1970
    PubMed
    Summary

    Numerical solutions reveal oxygen diffusion in hemoglobin solutions. Facilitated oxygen flux is less than equilibrium models predict for concentrated hemoglobin layers, like human erythrocytes.

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    Area of Science:

    • Biophysics
    • Physiological Transport Phenomena

    Background:

    • Oxygen transport is crucial for cellular respiration.
    • Hemoglobin facilitates oxygen diffusion.
    • Understanding diffusion in hemoglobin solutions informs physiological models.

    Purpose of the Study:

    • To numerically solve steady-state oxygen diffusion equations in hemoglobin solutions.
    • To analyze the dependence of facilitated oxygen flux on system parameters.
    • To compare numerical results with chemical equilibrium models.

    Main Methods:

    • Quasi-linearization method for numerical solutions.
    • Modeling steady-state diffusion of oxygen.
    • Analysis of facilitated flux based on layer thickness and reaction rates.

    Main Results:

    • Facilitated oxygen flux is dependent on layer thickness and reaction-rate coefficients.
    • Equilibrium models adequately describe diffusion in thin hemoglobin layers.
    • Facilitation is significantly less than predicted by equilibrium models for concentrated hemoglobin layers (erythrocyte thickness).

    Conclusions:

    • Steady-state oxygen diffusion in hemoglobin solutions can be modeled using numerical methods.
    • Chemical equilibrium assumption is valid for thinner layers but not for concentrated, erythrocyte-thickness layers.
    • Discrepancies highlight the need for refined models for physiological oxygen transport.

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