Issue
EPL
Volume 83, Number 6, September 2008
Article Number 68002
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/83/68002
Published online 15 September 2008
EPL, 83 (2008) 68002
DOI: 10.1209/0295-5075/83/68002

Manipulating a single adsorbed DNA for a critical endpoint

Rajeev Kapri1 and Somendra M. Bhattacharjee2

1   Department of Theoretical Physics, Tata Institute of Fundamental Research - Mumbai 400 005 India
2   Institute of Physics - Bhubaneswar 751 005 India

rkapri@theory.tifr.res.in
somen@iopb.res.in

received 22 April 2008; accepted in final form 4 August 2008; published September 2008
published online 15 September 2008

Abstract
We show the existence of a critical endpoint in the phase diagram of unzipping of an adsorbed double-stranded (ds) polymer like DNA. The competition of base pairing, adsorption and stretching by an external force leads to the critical end point. From exact results, the location of the critical end point is determined and its classical nature established.

PACS
82.37.Rs - Single molecule manipulation of proteins and other biological molecules.
68.35.Rh - Phase transitions and critical phenomena.
05.70.Jk - Critical point phenomena.

© EPLA 2008