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Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy

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Translational diffusion coefficients of macromolecules.

R Rodríguez Schmidt¹, J G Hernández Cifre, J García de la Torre

¹Departamento de Química Física, Facultad de Química, Universidad de Murcia, Spain.

The European Physical Journal. E, Soft Matter

|December 15, 2012

Summary

This study compares methods for calculating polymer diffusion coefficients. Computer simulations reveal slight variations in results based on polymer flexibility and chosen theoretical approaches.

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Area of Science:

Polymer physics
Physical chemistry
Computational science

Background:

Calculating the translational diffusion coefficient of flexible polymers in dilute solutions is crucial for understanding their behavior.
Existing theories, such as Einstein theory and Kirkwood-Riseman theory, offer different frameworks for this calculation.
These theories can yield varying diffusion coefficient values depending on approximations and polymer characteristics.

Purpose of the Study:

To evaluate common computational procedures for determining the diffusion coefficient of flexible macromolecules.
To compare the diffusion coefficient values obtained from different theoretical approaches and approximations.
To analyze the impact of polymer flexibility on calculated diffusion coefficients.

Main Methods:

Utilizing computer simulations to model flexible polymer chains in dilute solution.
Applying established theoretical frameworks, including Einstein theory and Kirkwood-Riseman theory.
Investigating various approximations within the Kirkwood-Riseman theory for solving its equations.

Main Results:

Computer simulations provide a practical means to compute polymer diffusion coefficients.
Different theoretical approaches and approximations result in slightly varied diffusion coefficient values.
The flexibility of the polymer chain influences the calculated diffusion coefficient.

Conclusions:

The choice of theoretical framework and approximations impacts the calculated translational diffusion coefficient.
Computer simulations offer a valuable tool for assessing these differences and understanding polymer dynamics.
Accurate calculation of diffusion coefficients requires careful consideration of polymer properties and theoretical underpinnings.