NDLI: Dielectric changes precede hydrogen bond breakage during helix to coil transition of deoxyribonucleic acid

Content Provider	IEEE Xplore Digital Library
Author	Georgakilas, A.G. Haveles, K.S. Konsta, A. Sideris, E.G.
Copyright Year	1996
Description	Author affiliation: Inst. of Biol., Nat. Centre for Sci. Res., Athens, Greece (Georgakilas, A.G.)
Abstract	An interesting and simultaneously unexpected thermodynamic stability of the DNA helix was observed when studying the effects of exposure to /spl gamma/- and /spl alpha/-irradiation on the double helix to coil thermal transition phase of mammalian macromolecular DNA. The results show that at the low dose range, of 0 to 12 Gy, which is of importance for radiation biology and where the effects of exposure to ionizing radiation were not explored in the previously published work, an increase of the dose of ionizing radiation results in an increase of the thermodynamic stability as well as in an increase of the apparent molecular weight of the DNA macromolecules. In all cases conductivity changes precede by a /spl Delta/T of about 3/spl deg/C the helix to coil transition changes, as those are measured by the breakage of the intramolecular hydrogen bonds. This /spl Delta/T is independent of the effected molecular weight changes.
Starting Page	747
Ending Page	752
File Size	325354
Page Count	6
File Format	PDF
ISBN	0780326954
DOI	10.1109/ISE.1996.578201
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-09-27
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectrics Hydrogen Bonding DNA Ionizing radiation Coils Conductivity measurement Thermodynamics Thermal stability Temperature
Content Type	Text
Resource Type	Article

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