Microscopic formulation of the Zimm-Bragg model for the helix-coil transition.
Phys Rev E Stat Nonlin Soft Matter Phys
; 81(2 Pt 1): 021921, 2010 Feb.
Article
in En
| MEDLINE
| ID: mdl-20365609
ABSTRACT
A microscopic spin model is proposed for the phenomenological Zimm-Bragg model for the helix-coil transition in biopolymers. This model is shown to provide the same thermophysical properties of the original Zimm-Bragg model and it allows a very convenient framework to compute statistical quantities. Physical origins of this spin model are made transparent by an exact mapping into a one-dimensional Ising model with an external field. However, the dependence on temperature of the reduced external field turns out to differ from the standard one-dimensional Ising model and hence it gives rise to different thermophysical properties, despite the exact mapping connecting them. We discuss how this point has been frequently overlooked in the recent literature.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Models, Molecular
Type of study:
Qualitative_research
Language:
En
Journal:
Phys Rev E Stat Nonlin Soft Matter Phys
Journal subject:
BIOFISICA
/
FISIOLOGIA
Year:
2010
Document type:
Article
Affiliation country:
Italy
Country of publication:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA