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Updated: Jul 15, 2026

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Stretching short biopolymers by fields and forces.

Yuko Hori1, Ashok Prasad, Jané Kondev

  • 1Martin Fisher School of Physics, Brandeis University, Mailstop 057, Waltham, MA 02454-9110, USA. yhori@andover.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 16, 2007
PubMed
Summary

Boundary effects significantly alter semiflexible polymer properties, deviating from long-polymer models. This study precisely calculates polymer dimensions and shapes under various conditions, including electric field stretching.

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Biophysics

Background:

  • Semiflexible polymers exhibit unique mechanical properties when their contour length approaches their persistence length.
  • Existing models often assume long polymers, neglecting boundary effects.

Purpose of the Study:

  • To investigate the mechanical properties of semiflexible polymers with contour lengths comparable to their persistence length.
  • To analyze the impact of boundary conditions on polymer dimensions and shape.
  • To study the behavior of charged biopolymers under electric field stretching.

Main Methods:

  • Exact computation of average end-to-end distance and polymer shape.
  • Analysis of polymer behavior under different boundary conditions.
  • Calculation of average extension and shape for uniformly charged biopolymers in an electric field.

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Main Results:

  • Boundary effects cause significant deviations from established long-polymer theories.
  • The average shape of a uniformly charged biopolymer stretched by an electric field is trumpetlike.
  • Results are applicable to long biopolymers under strong fields or forces that suppress thermal fluctuations.

Conclusions:

  • Boundary conditions are crucial for accurately describing semiflexible polymers of comparable contour and persistence lengths.
  • The trumpetlike shape of stretched charged biopolymers provides insights into their mechanical response.
  • The findings extend the understanding of polymer behavior in both synthetic and biological systems.