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Tracer diffusion inside fibrinogen layers.

Michał Cieśla1, Ewa Gudowska-Nowak1, Francesc Sagués2

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Particle motion in crowded fibrinogen environments is subdiffusive and anisotropic. Its characteristics depend on fibrinogen ordering, concentration, and tracer size, revealing complex non-Fickian diffusion dynamics.

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Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Computational Biology

Background:

  • Fibrinogen molecules are anisotropic and can form ordered structures resembling nematic liquid crystals.
  • Crowded biological environments can significantly alter particle motion, leading to non-Fickian diffusion.
  • Understanding tracer particle dynamics in ordered molecular environments is crucial for biological processes.

Purpose of the Study:

  • To investigate the obstructed motion of tracer particles in simulated fibrinogen monolayers with varying orientational order.
  • To determine the relationship between fibrinogen molecular ordering and the non-Fickian diffusion of tracer particles.
  • To analyze how environmental crowding and tracer properties influence diffusion characteristics.

Main Methods:

  • Simulations of two-dimensional Gaussian random walk for tracer particles.
  • Modeling of fibrinogen monolayers with controlled orientational ordering.
  • Analysis of particle trajectories based on varying fibrinogen concentration and tracer radius.

Main Results:

  • Particle motion is generally subdiffusive and anisotropic within the fibrinogen environment.
  • The degree of orientational order in fibrinogen significantly impacts tracer particle diffusion.
  • Diffusion characteristics are sensitive to fibrinogen concentration and the radius of the diffusing probe.

Conclusions:

  • Fibrinogen molecular ordering dictates non-Fickian diffusion behavior of tracer particles.
  • Environmental crowding and tracer size are critical factors modulating anisotropic subdiffusion.
  • The study provides insights into complex particle dynamics in ordered biological soft matter.