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A positron annihilation study of hydrated DNA

✍ Scribed by John M. Warman; M. Eldrup

Publisher
Wiley (John Wiley & Sons)
Year
1986
Tongue
English
Weight
671 KB
Volume
25
Category
Article
ISSN
0006-3525

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✦ Synopsis

Positron annihilation measurements are reported for hydrated DNA as a function of water content and as a function of temperature (20 to -18OOC) for samples containing 10 and 50% wt of water. The ortho-positronium mean lifetime and its intensity show distinct variations with the degree of hydration and with temperature for the 50% sample. The 10% water sample was relatively insensitive to temperature variation. The results indicate that hydrated DNA containing up to 10% water behaves as a rigid crystalline solid but that the rigidity markedly decreases with a further increase in water content until, for approximately 50% water, its properties resemble more those of a highly viscous fluid.

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