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Related Concept Videos

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

824
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Related Experiment Video

Updated: May 1, 2026

Mechano-Node-Pore Sensing: A Rapid, Label-Free Platform for Multi-Parameter Single-Cell Viscoelastic Measurements
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A new dimensionless index for evaluating cell stiffness-based deformability in microchannel.

Chia-Hung Dylan Tsai, Shinya Sakuma, Fumihito Arai

    IEEE Transactions on Bio-Medical Engineering
    |March 25, 2014
    PubMed
    Summary

    This study introduces a new method to measure cell stiffness using microchannels, isolating stiffness from viscosity. The new index accurately evaluates cell stiffness-based deformability, as shown in red blood cell experiments.

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    Area of Science:

    • Biophysics
    • Cell Mechanics
    • Microfluidics

    Background:

    • Cell deformability is crucial for understanding cell function and disease.
    • Conventional methods often conflate cell stiffness and viscosity.
    • Microfluidic devices offer a platform for precise cell analysis.

    Purpose of the Study:

    • To develop a novel index for evaluating cell stiffness-based deformability.
    • To isolate the contribution of cell stiffness from viscosity in microchannel flow.
    • To establish a robust method for quantitative cell mechanics analysis.

    Main Methods:

    • Utilizing microchannel flow dynamics to analyze cell behavior.
    • Deriving dimensionless parameters through dimensional analysis.
    • Introducing a new index based on equilibrium cell velocity and derived parameters.
    • Conducting experimental validation using red blood cells.

    Main Results:

    • A new index for stiffness-based deformability was successfully developed.
    • The method effectively separates cell stiffness from viscous effects.
    • Experimental data from red blood cells aligned well with the proposed index.
    • The equilibrium velocity of a cell in a microchannel is a key indicator.

    Conclusions:

    • The proposed index provides a more accurate assessment of cell stiffness-based deformability.
    • This method enhances the understanding of cell mechanics in microfluidic systems.
    • The findings have implications for diagnosing diseases affecting cell mechanical properties.