Kinya Kobayashi

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2-Aminopyridine (PA)-derivatized oligosaccharides from IgG were analyzed by using reversed-phase HPLC/mass spectrometry (RP-HPLC/MS) and a MS(n) spectral library, in particular, focusing on two pairs of isomers incompletely separated or coeluted in chromatograms. We previously reported that MS(n) spectral matching considering both major fragment ions (m/z)(More)
—The diffraction by a semi-infinite parallel-plate waveguide with sinusoidal wall corrugation is analyzed for the H-polarized plane wave incidence using the Wiener-Hopf technique combined with the perturbation method. Introducing the Fourier transform for the unknown scattered field and applying an approximate boundary condition together with a perturbation(More)
The H-polarized plane wave diffraction by a thin material strip is analyzed using the Wiener-Hopf technique together with approximate boundary conditions. An asymptotic solution is obtained under the condition that the thickness and the width of the strip are small and large compared with the wavelength, respectively. The scattered field is evaluated(More)
The E-polarized plane wave diffraction by a thin material strip is analyzed using the Wiener-Hopf technique together with approximate boundary conditions. An asymptotic solution is obtained under the condition that the thickness and the width of the strip are small and large compared with the wavelength, respectively. The scattered field is evaluated(More)
Highly complex protein mixtures can be analyzed after proteolysis using liquid chromatography/mass spectrometry (LC/MS). In an LC/MS run, intense peptide ions originating from high-abundance proteins are preferentially analyzed using tandem mass spectrometry (MS(2)), so obtaining the MS(2) spectra of peptide ions from low-abundance proteins is difficult(More)
In order to elucidate the effect of the sugar and phosphate backbones on the stable structure and electronic properties of stacked DNA base-pairs, we performed ab initio molecular orbital (MO) calculations based on the density functional theory and Slater-type basis set. As a model cluster for stacked base-pairs, we employed three isomers for the dimer unit(More)
—The diffraction by a semi-infinite parallel-plate waveguide with sinusoidal wall corrugation is analyzed for the E-polarized plane wave incidence using the Wiener-Hopf technique together with the perturbation method. The problem is formulated in terms of the simultaneous Wiener-Hopf equations by introducing the Fourier transform for the unknown scattered(More)
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