✦ LIBER ✦

The speed of sound in DNA

✍ Scribed by M. B. Hakim; S. M. Lindsay; J. Powell

Publisher: Wiley (John Wiley & Sons)
Year: 1984
Tongue: English
Weight: 431 KB
Volume: 23
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360230704

No coin nor oath required. For personal study only.

✦ Synopsis

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.

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