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Related Experiment Video

Updated: Nov 4, 2025

The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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A single active ring model with velocity self-alignment.

Emanuel F Teixeira1, Heitor C M Fernandes1, Leonardo G Brunnet1

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, CP 15051, CEP 91501-970 Porto Alegre - RS, Brazil. teixeiraemanuel9@gmail.com heitor.fernandes@ufrgs.br leon@if.ufrgs.br.

Soft Matter
|May 28, 2021
PubMed
Summary
This summary is machine-generated.

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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This study introduces a 2D active matter model for cells, simulating their collective behavior. The model reveals how particle interactions and forces influence emergent translational and rotational movement patterns.

Area of Science:

  • Physics
  • Biophysics
  • Computational Biology

Background:

  • Cellular tissue behavior is complex, involving out-of-equilibrium biochemical reactions and physical interactions.
  • Active matter systems, driven by internal energy, exhibit unique collective phenomena.
  • Computer simulations are crucial for modeling complex biological systems and testing hypotheses.

Purpose of the Study:

  • To develop and analyze a two-dimensional extended active matter model for biological cells.
  • To investigate the collective states and emergent behaviors of cells represented as interconnected self-propelled particles.
  • To understand the influence of particle interactions and forces on cellular movement and organization.

Main Methods:

  • Developed a 2D extended active matter model using a ring of interconnected self-propelled particles.

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  • Applied harmonic and bending potentials to neighboring particles.
  • Utilized analytical results from active Brownian particles to determine characteristic time scales.
  • Performed finite-size scale investigations and analyzed ring shape dynamics.

    • Main Results:

    • Identified translational, rotational, and mixed collective states in the cell model.
    • Determined effective time scales for ballistic and diffusive movements.
    • Observed a linear increase in ring diffusion with size during collective movement.
    • Found that collective states persist even with weak bending forces, showing spontaneous polarization in translational modes.

    Conclusions:

    • The active matter model effectively captures emergent cellular behaviors and collective states.
    • Particle interactions and forces play a significant role in determining cellular movement patterns and organization.
    • The model provides insights into phenomena like spontaneous polarization in biological systems.