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DNA Condensation by Field‐Induced Non‐Equilibrium Noise
Author(s) -
Bruinsma Robijn F.,
Riehn Robert
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900525
Subject(s) - thermal fluctuations , condensation , noise (video) , chemical physics , field (mathematics) , electric field , charge (physics) , thermal equilibrium , physics , thermal , wavelength , chemistry , molecular physics , condensed matter physics , thermodynamics , optics , quantum mechanics , mathematics , artificial intelligence , computer science , pure mathematics , image (mathematics)
Abstract DNA molecules under good solvent conditions condense when subjected to strong AC electrical fields. It is shown that AC electrical fields couple charge fluctuations to molecular shape fluctuations, which produces a non‐equilibrium noise source that can dominate over equilibrium thermal noise in the long‐wavelength limit. The field‐induced excess charge fluctuations amplify the Asakura–Oosawa fluctuation attraction force between neighboring chains, providing a mechanism for field‐induced DNA condensation.