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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Magnetic Resonance Society
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Korean Magnetic Resonance Society
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Volume & Issues
Volume 6, Issue 2 - Dec 2002
Volume 6, Issue 1 - Jun 2002
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ESR dosimetry and Dating toward
Ikeya, Motoji ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 84~88
Dating and dosimetry using electron spin resonance (ESR) in 20th Century developed at both Yamaguchi University and Osaka University have been reviewed with emphasis on new prospects and strategies in 21th century. Natural radiation have been generating radicals that accumulated in archaeological and geological materials. ESR detects these radicals and the ESR signal intensity is proportional to the radiation dose and therefore the age. The assessment of the total dose of natural radiation and the annual dose rate give their ESR ages. The ESR dating of stalactites and stalagmites ant Akiyoshi cave in Yamaguchi prefecture in 1975 was extended to anthropological dating using bones and tooth enamel excavated in Greek Petralona cave. Fossils of shells and corals gave the ages of marine terraces and sea-level changes. Quartz grains gave the ages of geothermal alteration and fault movements. Future ESR dating of ices at outer planets anf their satellite are also investigated as basic studies for ices od
as well as terrestrial hydrates in laboratory. Atomic bomb radiation dosimetry at Hiroshima and Nagasaki using ESR lead to the dosimetry of personnel, Chemobyl and JCO criticality accidents. Monitoring of radiation dose with sensitive materials with tissue equivalence are being developed. finally a new scanning ESR imaging apparatus (a near field microwave microscope) developed in our laboratory gave ESR images of Radicals from fossils to Si-CVD and diamond films as summarized in my book in 2002.
Clinical Application of Functional MRI : Motor Cortex Activities by Acupuncture
Choe, Bo-Young ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 89~93
We report a preliminary fMRI evidence of modulation of somatomotor areas by acupuncture in GB34 acupoint. GB34, located in the back of the knee, is known to be effective in recovering motor function after stroke. Using 3T MR scanner, functional MR imaging was performed in five normal volunteers in two stimulation paradigms; acupuncture manipulation on GB34 and sham points. Group analysis form five individuals showed that bilateral sensorimotor areas (BA 3,4,6 and 7) showed stimulation related BOLD signal contrast of approximately 6% whereas very few areas were activated when sham stimulation is given. Our results suggest that acupuncture fMRI study can be safely conducted in 3T environment and stimulation in GB34 modulate the cortical activities of the somatomotor area in human.
Complete Relaxation and Conformational Exchange Matrix (CORCEMA) Analysis of Saturation Transfer Difference (STD) NMR Spectra of Ligand-Protein Complexes
Krishna, N.Rama ; Jayalakshmi, V. ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 94~102
An interesting recent application of intermolecular NOE experiment is the saturation transfer difference NMR(STD-NMR) method that is useful in screening compound libraries to identify bio-active ligands. This technique also identifies the group epitopes of the bound ligand in a reversibly forming protein-ligand complex. We present here a complete relaxation and conformational exchange matrix (CORCEMA) theory (Moseley et al., J. Magn. Reson. B, 108, 243-261 (1995)) applicable for the STD-NMR experiment. Using some ideal model systems we have analyzed the factors that influence the STD intensity changes in the ligand proton NMR spectrum when the resonances from some protons on the receptor protein are saturated. These factors will be discussed and some examples of its application in some model systems will be presented. This CORCEMA theory for STD-NMR and the associated algorithm are useful in a quantitative interpretation of the STD-NMR effects, and are likely to be useful in structure-based drug design efforts. They are also useful in a quantitative characterization of protein-protein (or protein-nucleic acid) contact surfaces from an intermolecular cross-saturation NMR experiment.
Electron Paramagnetic Resonance Study on the Photoproduced Cation Radical of N-Methylphenothiazine in the Gel Matrices
Lee, Don-Keun ; Zhang, Dong-Ri ; Kang, Youn-Soo ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 103~112
The photoproduced cation radical of N-methylphenothiazine
doped into phenyltriehtoxysilane (PhiTEOS), vinyltriethoxysilane (VTEOS) and methyltriethoxysilane (METOS) was studied with electron spin resonance (ESR) and electron nuclear double resonance (ENDOR). The photoinduced charge separation efficiency was determined by integration of ESR spectra which correspond to the amount of photoproduced cation radical in the matrices. This was correlatively studied with the polarity and pore size of the gel matrices. The relative polarity of the matrices was determined by measuring
in the different matrices. The relative pore size among the matrices was determined by measuring relative proton matrix ENDOR line widths of the photoproduced cation of
. The decay kinetic constants of the cation radical of
in the different matrices with relatively studied with fitting the biexponential decay curves after exposure at the ambient condition. This is correlatively interpreted with the polarity and pore size of the matrices.
Electron Spin Resonance Studies of Mn(+2), Gd(+3) and Cu(+2) in Chalcogenide Glasses (
Lee, Chul-Wee ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 113~117
The chalcogenide glass (ALS,
) was prepared by melting a stoichiometric mixture of aluminum powder and
. Glasses containing 0.1-0.1% of
were also prepared. The characteristic features of the ESR spectra for the transition metal containing ALS glasses are interpreted.
Location and Adsorbate Interactions in (M)MnH-SAPO-34 and (W)MnH-SAPO-34 studied by EPR and Electron Spin Echo Modulation Spectroscopies
Back, Gern-Ho ; Kim, Yang-Hee ; Cho, Young-Soo ; Lee, Yong-Ill ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 118~131
Manganese-doped H-SAPO-34 samples were prepared by an ion-exchanged reaction between H-SAPO-34 and paramagnetic Mn(II) species in methanol media and characterized by ESR and Electron Spin-Echo Modulation(ESEM) studies. In the hydrated (W)MnH-SAPO-34 measured in water, the Mn(II) ion was octahedrally coordinated with four framework oxygens and two water molecules at a displaced site IV of the eight membered ring window in the ellipsoidal cavity, while the Mn(II) ion was octahedrally coordinated to three framework oxygens and three water molecules at a displaced site I' of the six membered ring window in the ellipsoidal cavity in hydrated(M)MnH-SAPO-34 measured in methanol. The similar result was found in the experiments with methanol adsorbents except ethanol.
Bottleneck Behavior of
NMR Spin-lattice Relaxation in Ammonium Sulfate
Hong, Kwan-Soo ; Yu, In-Suk ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 132~141
nuclear magnetic resonance (NMR) relaxations have been investigated in ammonium sulfate
power at temperatures ranging form 102 K to 440 K. There is a bottleneck in the spin-lattice relaxation between the nuclear spin system and the hindered rotation of ammonium ions, which is certified by measuring the relaxation according to the initial condition of the spin system. For temperatures below 318 K the
spin-lattice relaxations have double-exponential behaviors with the exponent, n, having a value 2>n>1 initially and n=l after a long time. Above 318 K not only is the relaxation exponential initially with exponent n=1, but it is a single-exponential over the entire time, resulting in one
value. The two types of
ions have different activation energies for hindered rotation,
, in the ferroelectric phase.
NOISE Spectroscopy: Applications to Solid State NMR
Yang, Doo-Kyung ; Zax, D.B. ;
Journal of the Korean Magnetic Resonance Society, volume 6, issue 2, 2002, Pages 142~154
One of the oldest, still unsolved, and often ignored problems in magnetic resonance remains the issue of how to observe undistorted, normal one-dimensional spectra where the frequencies and their relative intensities represent faithfully the distribution of spins and sites in the sample within the magnet. Often distortions in these parameters are accepted, as the price of sensitivity enhancement, or because it is unclear just how these distortions might be avoided. Surprisingly enough, the problem is exacerbated by the use of modern techniques of pulsed Fourier transform NMR. Noise spectroscopy is an approach to solving the problem of distorted NMR spectra, which is largely under appreciated; it promises virtually "unlimited" distortionless bandwidths without costly hardware investments. Nonetheless, its exploitation remains limited. We will discuss why noise spectroscopy belongs in the arsenal of tricks spectroscopists should be aware of, show examples where its use is essential if accurate, quantitative NMR is to be expected, and discuss some recent approaches which extend its applicability yet further, particularly in solid state NMR and in applications to quadrupolar nuclear spins.