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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 4, Issue 2 - Dec 2000
Volume 4, Issue 1 - Feb 2000
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NMR Studies on N-terminal Domain of DNA2
Jung, Young-Sang ; Lee, Kyoung-Hwa ; Jung, Jin-Won ; Lee, Weontae ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 74~81
Saccharomyces cerevisiae Dna2 protein has biochemical activities: DNA-dependent ATPase, DNA helicase and DNA nuclease and is essential for cell viability. Especially, Pro
504/ is determined as an important residue in ATPase, helicase, and nuclease activity. We synthesized and determined the three-dimensional solution structure of N-terminal domain comprising residues of Val
pep/) using two-dimensional
H-NMR and dynamical simulated annealing calculations. On the basis of a total of 44 experimental restraints including NOEs,
/ coupling constants, the solution structures of Dna2
epe/ were calculated with the program CNS. The 23 lowest energy structures were selected out of 50 final simulated-annealing structures. The atomic RMSDs of the final 23 structures fur the individual residues were calculated with respect to the average structure. The mean RMSDs for the 23 structures were 0.042 nm for backbone atoms and 0.316 nm for all heavy atoms, respectively. The Ramachandran plot indicates that the
, Ψ angles of the 23 final structures are properly distributed in energetically acceptable regions. Solution structure of Dna2
pep/ showed a single unique turn spanning residues of Asn
Pulsed Electron Paramagnetic Resonance Application on the Photoinduced Charge Separation of Alkylphenothiazine Derivatives in Molecular Assemblies
Kang, Young-Soo ; Park, Chan-Young ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 82~90
Photoinduced charge separation of alkylphenothiazines in molecular assemblies such as positively, negatively and neutrally charged micelle interface results in the paramagnetic phenothiazine cation radical. This was studied as a model system for the light energy conversion into chemical energy. The photoproduced phenothaizne cation radical was identified and its amount was quantized with electron spin resonance (ESR). The microenvironment of photoproduced cation radical was studied with pulsed-ESR. Such a charge separation is enhanced by the optimization of various structural factors of the molecular assemblies. The structural factors of molecular assemblies have focused on the interface charge, interface structure with different headgroups and interfacial perturbation by disolving interface active organic additives.
Electron Spin Resonance and Electron Nuclear Double Resonance Studies on the Photoinduced Charge Separation of N-Methylphenothiazine in Phenyltriethoxysilane, Vinyltriethoxysilane and Methyltriethoxysilane Gel Matrices
Kang, Young-Soo ; Park, Chan-Young ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 91~102
The photoproduced cation radical of N-methylphenothiazine doped in the different kind of matrices of phenyltriethoxysilane (PhiTEOS), vinyltriethoxysilane (VTEOS), and methyloiethoxysilane (METOS) was comparatively 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 polarity of the matrices was comparatively determined by measuring λ
max/ values of PC
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 radical of PCI. The decay kinetic constants of the cation radical of PCI in the different matrices was relatively studied with fitting the biexponential decay curves after exposure into the ambient condition. This is correlatively interpreted with the polarity and pore size of the matrices.
Noise Suppression in NMR Spectrum by Using Wavelet Transform Analysis
Kim, Daesung ; Youngdo Won ; Hoshik Won ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 103~115
Wavelet transforms are introduced as a new tool to distinguish real peaks from the noise contaminated NMR data in this paper. New algorithms of two wavelet transforms including Daubechies wavelet transform as a discrete and orthogonal wavelet transform (DWT) and Morlet wavelet transform as a continuous and nonorthogonal wavelet transform(CWT) were developed fer noise elimination. DWT and CWT method were successfully applied to the noise reduction in spectrum. The inevitable distortion of NMR spectral baseline and the imperfection in noise elimination were observed in DWT method while CWT method gives a better baseline ahape and a well noise suppressed spectrum.
Noise Suppression of NMR Signal by Piecewise Polynomial Truncated Singular Value Decomposition
Kim, Daesung ; Youngdo Won ; Hoshik Won ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 116~124
Singular value decomposition (SVD) has been used during past few decades in the advanced NMR data processing and in many applicable areas. A new modified SVD, piecewise polynomial truncated SVD (PPTSVD) was developed far the large solvent peak suppression and noise elimination in U signal processing. PPTSVD consists of two algorithms of truncated SVD (TSVD) and L
problems. In TSVD, some unwanted large solvent peaks and noises are suppressed with a certain son threshold value while signal and noise in raw data are resolved and eliminated out in L
problem routine. The advantage of the current PPTSVD method compared to many SVD methods is to give the better S/N ratio in spectrum, and less time consuming job that can be applicable to multidimensional NMR data processing.
Complete Assignment of the
NMR Spectra of a Sucrose Ester from Euphorbia Lathyris L.
Jung, Min-Hwan ; Kim, Hyun-Sik ; Sangdoo Ahn ; Kim, Cheong-Taek ; Jin, Mu-Hyun ; Yim, Yong-Hyeon ; Kim, Young-Kook ; Jong hoa Ok ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 125~132
C NMR assignments of a novel sucrose isovaleryl ester isolated from the seed of Euphorbia Lathyris L., were achieved by one-and two-dimensional techniques. The new sucrose ester was characterized as an
-D-fructofuranosyl, 2,6-bis(3-methylbutanoate); sucrose 4,7,8,11,12-pentaisovalerate by MS and NMR experiments.
Recommendations for the Selective Labeling of [
]-Labeled Amino Acids without Using Auxotrophic Strains
Chae, Young-Kee ;
Journal of the Korean Magnetic Resonance Society, volume 4, issue 2, 2000, Pages 133~139
The strategy to incorporate [
N]-labeled amino acids were discussed. Instead of using specific auxotrophic strains for selective labeling, the prototrophic strain, BL2l(DE3), was used with a plasmid, pLysS, and found to be very effective for several amino acids including alanine, lysine, leucine, and threonine. Isoleucine, valine, glutamine, and tyrosine were also found to be effective despite some diffusion into other amino acids. Interesting result was obtained when [
N]-labeled glycine was tried: only glycines were labeled when amino acid mixture was added in the growth medium, and serines were co-labeled when amino acids were omitted. These results can be used as a guideline when selective labeling strategy is considered, and when the resulting data are interpreted.