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Related Experiment Video

Updated: Jun 27, 2026

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Published on: November 2, 2011

Exact steady-state velocity of ratchets driven by random sequential adsorption.

Maria R D'Orsogna¹, Tom Chou, Tibor Antal

¹Department of Mathematics, UCLA, Los Angeles, CA 90095-1555.

Journal of Physics A: Mathematical and General

|December 17, 2008

Summary

We found that smaller adsorbing particles speed up polymer translocation through a pore. Smaller particles also reduce fluctuations in this ratcheting process, improving efficiency.

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Area of Science:

Polymer physics
Statistical mechanics
Soft matter physics

Background:

Polymer translocation through nanopores is crucial for biological processes and nanotechnology.
Understanding the dynamics of translocation driven by particle adsorption is complex due to coupled kinetics.

Purpose of the Study:

To investigate the discrete translocation of polymers through a pore driven by particle adsorption.
To determine the effect of particle size on translocation velocity and efficiency.
To analyze the underlying statistical mechanics of the ratcheting process.

Main Methods:

Analytical solution for the steady-state distribution of the gap between the pore wall and deposited particles.
Monte Carlo simulations to validate theoretical findings and explore particle size effects.
Comparison of ratcheting efficiencies for different particle sizes.

Main Results:

Derived the exact steady-state distribution for the gap, enabling calculation of mean translocation velocity.
Demonstrated that smaller adsorbing particles lead to faster translocation.
Observed reduced dispersion in translocation dynamics with smaller particles via simulations.
Defined and compared the relative efficiencies of particle-driven ratcheting.

Conclusions:

Particle size is a critical parameter influencing the speed and smoothness of polymer translocation.
The described model provides a framework for understanding and optimizing particle-driven translocation systems.
The study introduces a zone-refinement concept applicable to particle-mediated transport processes.