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Hydration effect on the intrinsic magnetism of natural deoxyribonucleic acid as studied by EMR Spectroscopy and SQUID measurements

Authors
Kwon, Young-WanLee, Chang HoonDo, Eui-DooChoi, Dong HoonJin, Jung-IlKang, Jun SungKoh, Eui-Kwan
Issue Date
20-6월-2008
Publisher
WILEY-V C H VERLAG GMBH
Keywords
hydration effect; intrinsic magnetism; natural DNA; electron magnetic resonance; SQUID
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.29, no.6, pp.1233 - 1242
Indexed
SCIE
SCOPUS
KCI
Journal Title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume
29
Number
6
Start Page
1233
End Page
1242
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123368
ISSN
0253-2964
Abstract
The hydration effect on the intrinsic magnetism of natural salmon double-strand DNA was explored using electron magnetic resonance (EMR) spectroscopy and superconducting quantum interference device (SQUID) magnetic measurements. We learned from this study that the magnetic properties of DNA are roughly classified into two distinct groups depending on their water content: One group is of higher water content in the range of 2.6-24 water molecules per nucleotide (wpn), where all the EMR parameters and SQUID susceptibilities are dominated by spin species experiencing quasi one-dimensional diffusive motion and are independent of the water content. The other group is of lower water content in the range of 1.4-0.5 wpn. In this group, the magnetic properties are most probably dominated by cyclotron motion of spin species along the helical pi-way, which is possible when the momentum scattering time (tau(k)) is long enough not only to satisfy the cyclotron resonance condition (omega(c) tau(k) > 1) but also to induce a constructive interference between the neighboring double helices. The same effect is reflected in the S-shaped magnetization-magnetic field strength (M-H) curves superimposed with the linear background obtained by SQUID measurements, which leads to larger susceptibilities at 1000 G when compared with the values at 10,000 G. In particular, we propose that the spin-orbital coupling and Faraday's mutual inductive effect can be utilized to interpret the dimensional crossover of spin motions from quasi 1D in the hydrate state to 3D in the dry state of dsDNA.
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