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Experimental detection of long-distance interactions between biomolecules through their diffusion behavior: numerical

Ilaria Nardecchia1, Lionel Spinelli2, Jordane Preto3

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Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 13, 2014
PubMed
Summary

Interparticle interactions, including Coulomb-electrostatic and dipole-electrodynamic forces, reduce self-diffusion. These interactions also induce chaotic diffusion and suggest a method for probing biomolecular electrodynamics.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Biophysics

Background:

  • Understanding particle dynamics is crucial in various scientific fields.
  • Long-range interactions significantly influence particle behavior.
  • Investigating diffusion under different interaction types is essential.

Purpose of the Study:

  • To numerically investigate particle dynamics and diffusion under Coulomb-electrostatic and dipole-electrodynamic interactions.
  • To analyze the impact of attractive and repulsive forces on self-diffusion.
  • To explore the emergence of dynamical chaos and its effect on diffusion.

Main Methods:

  • Numerical simulations of mutually interacting particles.
  • Analysis of self-diffusion coefficients.
  • Development of a model to calculate interaction-induced corrections to Brownian diffusion.
  • Observation of transitional phenomena under competing interactions.

Main Results:

  • Interparticle interactions consistently lower the self-diffusion coefficient, regardless of force character (attractive/repulsive).
  • A simple model confirms the reduction in diffusion coefficient due to interparticle interactions.
  • Dynamical chaos and chaotic diffusion emerge, following an Einstein-Fick-like law for mean-square displacement.
  • Transitional phenomena are observed for combined and individual interaction types.

Conclusions:

  • Interparticle interactions significantly alter particle dynamics and diffusion, leading to reduced self-diffusion and chaotic diffusion.
  • The findings provide a foundation for understanding complex particle systems.
  • The study suggests a feasible experimental approach to probe resonant electrodynamic interactions in biomolecules.