Stretching must twist DNA

Europhysics Letters

Volumn 38, Issue 3, 1997, Pages 183-188

  Marko, J F ^a  

^a UNIVERSITY OF ILLINOIS AT CHICAGO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0031579785     PISSN: 02955075     EISSN: None     Source Type: Journal    
DOI: 10.1209/epl/i1997-00223-5     Document Type: Article

References (28)

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14. ODIJK T., Macromolecules, 28 (1995) 7016.
15. Shearing of the internal structure of the double helix is not considered in this paper; additional elastic constants will be required to describe shearing, and might be important for the elasticity of short DNAs with different stretching boundary conditions, e.g. 5′ - 5′ vs. 5′ - 3′ tethers.
16. P. Nelson has communicated that a similar coupling of twist to stretch occurs in a microscopic elastic model of the double helix. R. D. KAMIEN, T. C. LUBENSKY, P. NELSON and C. S. O'HERN, this issue, p. 237.
17. WANG M. D., YIN H., LANDICK R., GELLES J. and BLOCK S. M., preprint (1996).
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22. Since υ ≤ 0 is physically disallowed, the constraint |u| ≤ α is used in treating eq. (5). Because q < 0 the results of this paper are not sensitive to the precise value of the lower bound on u, as long as it is between -1 and -0.5.
23. P. CLUZEL, Ph.D. Thesis, Université de Paris VI (1996), p. 104.
24. Ref. [13] estimates g = 22 using data of ref. [15] for z/L vs. linkage |σ| < 0.1, and for f = 8 pN. The agreement between these two different estimates of g is encouraging; the difference between them might be reconciled by considering that DNA strand separation is likely to occur in an untwisting experiment (DNA strand separation occurs for f = 0 if σ < -0.05). Additional variables describing the distance between complementary base pairs on the two strands might be added to the present model to study this.
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