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The sedimentation potential and the boycott effect.

L C Cerny1, C L Cerny, E L Cerny

  • 1Utica College of Syracuse University, Masonic Medical Research Laboratory, NY.

Biorheology
|January 1, 1988
PubMed
Summary
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Sedimentation potential, or the Dorn effect, was studied in erythrocytes. Researchers found that particle flexibility, shape, concentration, and inclination angle can be unified into a single sedimentation curve.

Area of Science:

  • Electrokinetic phenomena
  • Biophysics
  • Colloid science

Background:

  • The Dorn effect describes potential differences arising from particle sedimentation in liquids.
  • The Boycott phenomenon influences sedimentation rates in inclined vessels.
  • Understanding erythrocyte behavior is crucial in various biomedical applications.

Purpose of the Study:

  • To investigate sedimentation potentials and zeta potentials of erythrocytes.
  • To explore the influence of particle shape, flexibility, concentration, and inclination angle on sedimentation.
  • To develop a unified model for erythrocyte sedimentation behavior.

Main Methods:

  • Erythrocytes were studied at 2-3% concentration in various shapes (discs, oblate spheroids, spheres, spindles).

Related Experiment Videos

  • Sedimentation potentials were measured using electrodes at different solution levels.
  • Zeta potentials were calculated from sedimentation potentials and compared with laser Doppler velocity measurements.

    • Main Results:

    • Sedimentation potentials were successfully measured for fixed erythrocytes.
    • Zeta potentials derived from sedimentation potentials correlated with laser Doppler velocity data.
    • A technique of reduced variables unified data across different particle properties and inclination angles onto a single curve.

    Conclusions:

    • The Dorn effect and Boycott phenomenon play significant roles in erythrocyte sedimentation.
    • A unified approach effectively models erythrocyte sedimentation, integrating particle characteristics and environmental factors.
    • This research provides a comprehensive understanding of erythrocyte electrokinetic behavior during sedimentation.