The speed of sound in DNA

M. B. Hakim; Stuart Lindsay; J. Powell

doi:10.1002/bip.360230704

The speed of sound in DNA

M. B. Hakim, Stuart Lindsay, J. Powell

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

We have used Brillouin scattering to determine the speed of sound in (and hence longitudinal modulus of) A‐ and B‐DNA fibers. The speed of sound is very sensitive to the degree of hydration of the fibers, and measurements have to be made at laser powers below 5 mW to avoid local heating and dehydration. Under those conditions, we obtain sound speed perpendicular to the fiber axis of about 2.2 and 1.9 km/s in A‐ and B‐DNA fibers, respectively. A‐DNA fibers show a small anisotropy with sound speeds along the fiber axis higher by up to 10% B‐DNA fibers appear to be isotropic.

Original language	English (US)
Pages (from-to)	1185-1192
Number of pages	8
Journal	Biopolymers
Volume	23
Issue number	7
DOIs	https://doi.org/10.1002/bip.360230704
State	Published - Jul 1984

ASJC Scopus subject areas

Biophysics
Biochemistry
Biomaterials
Organic Chemistry

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10.1002/bip.360230704

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author = "Hakim, {M. B.} and Stuart Lindsay and J. Powell",

year = "1984",

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AU - Powell, J.

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AB - We have used Brillouin scattering to determine the speed of sound in (and hence longitudinal modulus of) A‐ and B‐DNA fibers. The speed of sound is very sensitive to the degree of hydration of the fibers, and measurements have to be made at laser powers below 5 mW to avoid local heating and dehydration. Under those conditions, we obtain sound speed perpendicular to the fiber axis of about 2.2 and 1.9 km/s in A‐ and B‐DNA fibers, respectively. A‐DNA fibers show a small anisotropy with sound speeds along the fiber axis higher by up to 10% B‐DNA fibers appear to be isotropic.

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The speed of sound in DNA

Abstract

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