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Related Concept Videos

Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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Stretching multistate flexible chains and loops.

Geunho Noh1, Panayotis Benetatos1

  • 1Department of Physics, <a href="https://ror.org/040c17130">Kyungpook National University</a>, Daegu 41566, Republic of Korea.

Physical Review. E
|August 20, 2024
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Summary
This summary is machine-generated.

This study models reversible polymer loops, like those in DNA, revealing unique elasticity and phase transitions. Multistate looping and zipping chains show distinct behaviors compared to simple chains.

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Area of Science:

  • Polymer physics
  • Biophysics
  • Statistical mechanics

Background:

  • Polymer loop structures are fundamental in biological processes like DNA looping and denaturation.
  • Loop formation alters a polymer chain's elastic properties due to entropic changes.
  • Reversible loop formation introduces complex multistate conformational behavior.

Purpose of the Study:

  • To model and analyze the mechanical and thermodynamic properties of multistate reversible polymer loops.
  • To investigate the force-extension relationships in looping and zipping Gaussian chain models.
  • To explore the phase behavior of a Gaussian necklace composed of alternating loop and zipped segments.

Main Methods:

  • Development of theoretical models for looping and zipping Gaussian chains.
  • Calculation of force-extension relations in fixed-extension (Helmholtz) and fixed-force (Gibbs) ensembles.
  • Construction of a force-temperature phase diagram for a Gaussian necklace model.

Main Results:

  • Multistate systems exhibit distinct tensile elasticity and ensemble inequivalence compared to single chains.
  • The models reveal unique behaviors arising from reversible loop and zip formation.
  • A force-induced phase transition from a looped to a mixed state was identified in the Gaussian necklace.

Conclusions:

  • Reversible multistate polymer loops display complex elasticity and ensemble-dependent properties.
  • Theoretical models provide insights into the behavior of biological polymers under force.
  • The findings suggest potential for force-controlled conformational changes in polymer systems.