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Anomalous polymer sedimentation far from equilibrium.

Xaver Schlagberger1, Roland R Netz

  • 1Physics Department, Technical University Munich, 85748 Garching, Germany.

Physical Review Letters
|May 16, 2007
PubMed
Summary
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Flexible polymers compact in small fields but stretch in strong fields, impacting their sedimentation. For very large fields, a unique tadpole structure forms, observed in DNA experiments.

Area of Science:

  • Polymer Physics
  • Biophysics
  • Fluid Dynamics

Background:

  • Understanding polymer behavior in external fields is crucial for various applications.
  • Previous studies have explored polymer dynamics, but behavior in strong sedimentation fields requires further investigation.
  • Linear and circular DNA serve as model systems for flexible polymers.

Purpose of the Study:

  • To investigate the behavior of a single flexible polymer under strong sedimentation fields.
  • To elucidate the relationship between polymer chain length, field strength, and conformational changes.
  • To compare simulation results with experimental data from ultracentrifugation.

Main Methods:

  • Hydrodynamic simulations were employed to model polymer behavior.
  • Scaling arguments were used to analyze the simulation data.

Related Experiment Videos

  • Results were validated against ultracentrifuge experiments on DNA molecules.

    • Main Results:

    • Observed polymer compaction in short chains and small fields.
    • Demonstrated polymer stretching and decreased sedimentation coefficient in longer chains or stronger fields.
    • Identified the formation of a tadpole-like structure (compact head, stretched tail) in very large fields.
    • Confirmed agreement between simulation findings and experimental data for linear and circular DNA.

    Conclusions:

    • Polymer conformation and sedimentation are highly dependent on field strength and chain length.
    • The formation of a tadpole structure represents a novel behavior in extreme sedimentation fields.
    • Hydrodynamic simulations and scaling arguments provide a robust framework for studying polymer dynamics in external fields.