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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 14646
School of Nano Science
  Title:   Stiffer double-stranded DNA in two-dimensional confinement due to bending anisotropy
  Author(s): 
1 . Hossein Salari
2 . B. Eslami-Mossallam
3 . H. F. Ranjbar
4 . Mohammad Reza Ejtehadi
  Status:   Published
  Journal: Phys. Rev. E
  Vol.:  94
  Year:  2016
  Pages:   062407
  Publisher(s):   American Physical Society
  Supported by:  IPM
  Abstract:
Using analytical approach andMonte Carlo (MC) simulations, we study the elastic behavior of the intrinsically twisted elastic ribbons with bending anisotropy, such as double-strandedDNA(dsDNA), in two-dimensional (2D) confinement.We show that, due to the bending anisotropy, the persistence length of dsDNA in 2D conformations is always greater than three-dimensional (3D) conformations. This result is in consistence with the measured values for DNA persistence length in 2D and 3D in equal biological conditions. We also show that in two dimensions, an anisotropic, intrinsically twisted polymer exhibits an implicit twist-bend coupling, which leads to the transient curvature increasing with a half helical turn periodicity along the bent polymer.

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