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Comparison of theories for the translational and rotational diffusion coefficients of rod-like macromolecules. Application to short DNA fragments

Tirado, M. Mercedes, Martínez, Carmen López, de la Torre, José García·1984·The Journal of Chemical Physics

Abstract

Two theories relating the translational and rotational diffusion coefficients Dt and Dr of a rod-like macromolecule to its length and diameter, proposed by Broersma [J. Chem. Phys. 74, 6989 (1981)], and Tirado and García de la Torre [J. Chem. Phys. 71, 2581 (1979); 73, 1986 (1980)] are shown to predict different values of the coefficients for a particle of given dimensions. Next, we use the two theories to analyze existing experimental data of sedimentation coefficients s and translational and rotational diffusion coefficients of short DNA fragments, and obtain values of the hydrated diameter of DNA d which is treated as an adjustable parameter. The results are compared with the expected value, d≂26Å. This comparison favors clearly the Tirado–Garcia de la Torre theory in the case of Dt and s. For Dr, and using a rise per base pair r=3.4 Å, this theory gives best agreement for all the data examined, while when r=3.3 Å, the agreement depends on the source of data.

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Metadata

Authors
Tirado, M. M., Martínez, C. L., & de la Torre, J. G.
Venue
The Journal of Chemical Physics
Published
1984-08-15
Volume
81
Issue
4
Pages
2047-2052
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
OpenAlex
W2019173788
Cited by
552
References
11
FWCI
0.82
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Comparison of theories for the translational and rotational diffusion coefficients of rod-like macromolecules. Application to short DNA fragments. https://app.cochat.ai/papers/10.1063/1.447827
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Tirado, M. M., Martínez, C. L., & de la Torre, J. G. (1984). Comparison of theories for the translational and rotational diffusion coefficients of rod-like macromolecules. Application to short DNA fragments. The Journal of Chemical Physics. https://doi.org/10.1063/1.447827

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