Inverse Problems is delighted to announce a special issue of review articles and one paper that were invited by the Editorial Board to celebrate the journal’s 25th year.

## Journal of Physics A: Special Issue on Entanglement Entropy

Journal of Physics A: Mathematical and Theoretical is delighted to announce the publication of a special issue on entanglement entropy in extended quantum systems.

## Statistical Properties of Metastable Intermediates in DNA Unzipping

Author(s): J. M. Huguet, N. Forns, and F. Ritort<br/>We unzip DNA molecules using optical tweezers and determine the sizes of the cooperatively unzipping and zipping regions separating consecutive metastable intermediates along the unzipping pathway. Sizes are found to be distributed following a power law, ranging from one base pair up to more than a ...<br/><img src="http://prola.aps.org/graphics/free2read30x30.gif" width="30" height="30" alt="Free to Read"/><br/>[Phys. Rev. Lett. 103, 248106] Published Thu Dec 10, 2009