Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Magnetic Resonance Society
Journal Basic Information
Journal DOI :
Korean Magnetic Resonance Society
Editor in Chief :
Volume & Issues
Volume 5, Issue 2 - Dec 2001
Volume 5, Issue 1 - Jun 2001
Selecting the target year
Noise Suppression of NMR Spectrum by Shifted Harr Wavelet Transform
Hoshik Won ; Kim, Daesung ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 66~72
The noise suppression of time domain NMR data by discrete wavelet transform with high order Daubechies wavelet coefficients exhibits severe peak distortion and incomplete noise suppression near real signal. However, the fact that even a shift averaged Harr wavelet transform with a set of Daubechies wavelet coefficients (1/2, -l/2) can be used as a new and excellent tool to distinguish real peaks from the noise contaminated NMR signal is introduced. New algorithms of shift averaged Harr wavelet were developed and quantitatively evaluated in terms of threshold and signal to noise ratio (SNR).
Location and Adsorbate Interactions of V(IV) Species in VH-SAPO-34 Studied by EPR and Electron Spin-Echo Modulation Spectroscopies
Gernho Back ; Cho, Young-Soo ; Lee, Yong-Ill ; Kim, Yanghee ; Larry Kevan ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 73~90
Vanadium-doped H-SAPO-34 samples were prepared by a high-temperature solid-state reaction between SAPO-34 and the paramagnetic V(Ⅳ) species and characterized carefully by EPR and Electron Spin-Echo Modulation(ESEM) studies. The paramagnetic vanadium species generated in both V
5/ and VOSO
4/ of SAPO-34 have the same narrow range of g value fur vanadium species assigned to VO
2+/ inferred from the isotropic EPR spectrum at 293 K. The EPR and ESEM data indicate that the V(Ⅳ) species exist as a vanadyl ion either as [V(Ⅳ)]O
2+/ or V
4+/. The [V(Ⅳ)]O
2+/ species seems to be more probable because SAPO-34 having a low negative framework charged and more positively charged species like V
4+/can not be easily stabilized. Tetravalent vanadium ion in vadium-doped H- SAPO-34 can only be observed at the temperature lower than 77 K, while the vanadyl ion, VO
2+/in the activated sample of VH-SAPO-34 can produce the ion even at room temperature. After the adsorption of methanol, ethanol, propanol or ethene to the VH-SAPO-34, only one molecule coordinate to [V(Ⅳ)]O
2+/ was observed in EPR and ESEM spectra.
Complete assignments of
spectra of Chivosazole F
Park, Jung-Rae ; Jongheonn Shin ; Kim, Jin-Cheol ; Ahn, Jong-Woong ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 91~98
C NMR spectra of chivosazole F from Sorangium cellulosum were completely assigned by a combination of ID and 2D NMR techniques. The configurations of double bonds were confirmed from the ROESY spectra. The stereochemistry at asymmetric carboncenters was partially assigned on the basis of the results of NOE analysis.
Metabolic Changes in Patients with Parkinson's Disease after Stereotactic Neurosurgery by Follow-up 1H MR Spectroscopy
Choe, Bo-Young ; Baik, Hyun-Man ; Chun, Shin-Soo ; Son, Byung-Chul ; Kim, Moon-Chan ; Kim, Bum-Soo ; Lee, Hyoung-Koo ; Suh, Tae-Suk ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 99~109
Authors investigated neuronal changes of local cellular metabolism in the cerebral lesions of Parkinsonian symptomatic side between before and after stereotactic neurosurgery by follow-up 1H magnetic resonance spectroscopy (MRS). Patients with Parkinson's disease (PD) (n = 15) and age-matched normal controls (n = 15) underwen MRS examinations using a stimulated echo acquisition mode (STEAM) pulse sequence that provided 2
2 ㎤ (8ml) volume of interest in the regions of substantia nigra, thalamus, and lentiform nucleus. Spectral parameters were 20 ms TE, 2000 ms TR, 128 averages,2500 Hz spectral width, and 2048 data points. Raw data were processed by the SAGE data analysis package (GE Medical Systems). Peak areas of N-acetylaspartate (NAA), creatine (Cr), choline-containing compounds (Cho), inositols (Ins), and the sum (Glx) of glutamate and GABA were calculated by means of fitting the spectrum to a summation of Lorentzian curves using Marquardt algorithm. After blindly processed, we evaluated neuronal alterations of observable metabolite ratios between before and after stereotactic neurosurgery using Pearson product-moment analysis (SPSS, Ver. 6.0). A significant reduction of NAA/Cho ratio was observed in the cerebral lesion in substantia nigra of PD patient related to the symptomatic side after neurosurgery (P : 0.03). In thalamus, NAA/Cho ratio was also significantly decreased in the cerebral lesion including the electrode-surgical region (P : 0.03). A significant reduction of NAA/Cho ratio in lentiform nucleus was not oberved, but tended toward significant reduction after neurosurgery (P = 0.08). In particular, remarkable lactate signal was noted from the surgical thalamic lesions of 6 among 8 patients and internal segments of globus pallidus of 6 among 7 patients, respectively. Significant metabolic alterations of NAA/Cho ratio might reflect functional changes of neuropathological processes in the lesion of substantia nigra, thalamus, and lentiform nucleus, and could be a valuable finding fur evaluation of Parkinson's disease after neurosurgery. Increase of lactate signals, being remarkable in surgical lesions, could be consistent with a common consequence of neurosurgical necrosis. Thus, IH MRS could be a useful modality to evaluate the diagnostic and prognostic implications fur Parkinsons disease after functional neurosurgery.
MR Imaging of 5-FU Metabolism in Mice
Chaejoon Cheong ; Lee, Seung-C. ; Jae-G. Seo ; Kim, Sung W. ; Lee, Chulhyun ; Kim, Chul S. ; Taegyun Yang ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 110~117
F imaging of mice was carried out. For
F imaging, 5-flouro-uracil (5-FU) was injected into a mouse and in vivo detection of the catabolism of 5-FU to a-fluoro-P-alanine (FBAL) was carried out. The chemical shift selective (CHESS) imaging technique was employed. The 19F spectra and images give temporal and spatial information of the metabolism for 5-FU in mice.
NMR Study on Binding Interactions of Cationic Porphyrin Derivatives with double helical
Huh, Sungho ; Hong, Seokjoo ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 118~129
Binding interactions of cationic porphyrins, T4MPyP and TMAP with DNA oligomer d(CGCGAATTCGCG), were studied with NMR spectroscopy, W and CD spectroscopic method. Two porphyrins showed significant differences in NMR, UV and CD data upon binding to DNA. T4MPyP was considered to position more closely to DNA bases through partial intercalation as well as ionic intercalation between the positive charges of porphyrin and phosphate group of DNA at 5’-GC-3’steps. Contrast to this, TMAP was thought to bind to phosphate of DNA more or less outside of the groove.
NMR Relaxation Studies of Backbone Motion of the catalytic Residues in Free and Steroid-bound
Lee, Hee-Cheon ; Sunggoo Yun ;
Journal of the Korean Magnetic Resonance Society, volume 5, issue 2, 2001, Pages 130~137
Backbone dynamics of the catalytic residues in free and steroid-bound
-3- ketosteroid isomerase from Pseudomonas testosteroni has been examined by
N relaxation measurements. The relaxation data were analyzed using the model-free formalism to extract the model-free parameters (S
, and R
). Tyr-34 and Asp-99 exhibit enhanced high-frequency (pico- to nanosecond) internal motions in the free enzyme, which are restricted upon ligand binding, while Asp-38 experiences severe restriction of the internal motions in the fee enzyme, suggesting that Tyr-14 and Asp-99 are more actively involved in the ligand binding than Asp-38. The results also indicate that the H-bond network in the catalytic cavity might be slightly strengthened upon ligand binding, which may have some implications on the enzyme mechanism.he enzyme mechanism.m.