Document Detail

Metastable tight knots in a wormlike polymer.
MedLine Citation:
PMID:  18233259     Owner:  NLM     Status:  MEDLINE    
Based on an estimate of the knot entropy of a wormlike chain we predict that the interplay of bending energy and confinement entropy will result in a compact metastable configuration of the knot that will diffuse, without spreading, along the contour of the semiflexible polymer until it reaches one of the chain ends. Our estimate of the size of the knot as a function of its topological invariant (ideal aspect ratio) agrees with recent experimental results of knotted dsDNA. Further experimental tests of our ideas are proposed.
Alexander Y Grosberg; Yitzhak Rabin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-11-20
Journal Detail:
Title:  Physical review letters     Volume:  99     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2008-01-31     Completed Date:  2008-05-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  217801     Citation Subset:  IM    
Department of Physics, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, USA.
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MeSH Terms
DNA / chemistry
Models, Chemical*
Molecular Conformation
Polymers / chemistry*
Reg. No./Substance:
0/Polymers; 9007-49-2/DNA

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