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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion of interacting Brownian particles: Jamming and anomalous diffusion.

Sergey Savel'ev1, Fabio Marchesoni, Alessandro Taloni

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Particle diffusion on a ring shows normal behavior at long times. However, density affects diffusion, causing subdiffusion or jamming, especially with attractive interactions.

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Area of Science:

  • Statistical Mechanics
  • Condensed Matter Physics
  • Soft Matter Physics

Background:

  • Understanding particle diffusion is crucial in various physical systems.
  • Interacting particles on confined geometries present unique transport phenomena.
  • Self-diffusion dynamics are influenced by interaction potentials and system dimensionality.

Purpose of the Study:

  • Investigate the free self-diffusion of interacting particles on a quasi-one-dimensional ring.
  • Analyze the effects of attractive and repulsive interactions on diffusion dynamics.
  • Characterize density-dependent transitions, including subdiffusion and jamming.

Main Methods:

  • Numerical simulations of interacting particle systems.
  • Analytical modeling of diffusion processes.
  • Analysis of particle density and interaction effects on transport coefficients.

Main Results:

  • Observed normal diffusion at long times, with subdiffusive transients at specific densities.
  • Identified a density threshold leading to a jammed phase for attractive particles.
  • Demonstrated density-dependent cluster behavior: condensation for attractive, spreading for repulsive interactions.

Conclusions:

  • Particle density and interaction type significantly alter diffusion dynamics on quasi-1D rings.
  • Subdiffusion and jamming are key phenomena emerging from particle interactions and confinement.
  • Findings are relevant to diverse systems like colloidal suspensions and vortex arrays.