Volume 50, Number 4, May II 2000
|Page(s)||559 - 564|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Crystalline toroidal globules of DNA and other semi-flexible polymers: Jumps in radius caused by hexagonal packing
Institute of Advanced Studies,
Research School of Physical Sciences and Engineering
The Australian National University - Canberra, ACT 0200, Australia
School of Chemistry, University of Sydney - Sydney, NSW 2006, Australia
Accepted: 21 March 2000
We study a single semiflexible polymer chain immersed in a poor solvent. Such chains are stiff and are known to form toroidal globules. Here we examine the effects of hexagonally ordered packing of the chains. This packing induces a series of sharp transitions in the circuit number (number of complete circuits of the toroid) and major radius of the torus as a function of chain length. Circuit numbers corresponding to closed shells are strongly favoured and circuit numbers corresponding to a spare loop are forbidden. The potential landscape as a function of the circuit number consists of a series of minima separated by barriers. In some cases these barriers may be high enough to produce long-lived non-equilibrium tori.
PACS: 87.15.-v – Biomolecules: structure and physical properties / 36.20.Ey – Conformation (statistics and dynamics) / 05.60.-k – Transport processes
© EDP Sciences, 2000
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.