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71.
Yuichi Terui Chu Yi-wen Osamu Nozawa Takuya Fukunaga Yoshihisa Toda 《Tetrahedron letters》2008,49(19):3067-3070
In the course of our screening program for novel glycine transporter inhibitors, we obtained a novel cyclic tetrapeptide (WSS2220) from the culture broth of Nonomuraea sp. The structure of WSS2220 was elucidated based on physicochemical data. WSS2220 contained a novel amino acid (4-oxo-3′-sulfoisoleucine), the absolute stereochemistry of which was determined by chemical modifications and the modified Mosher’s method. WSS2220 selectively inhibited glycine transporter type1 with an IC50 of 20 nM. 相似文献
72.
The composition and pressure dependence of Raman spectra and the optical gap is investigated in order to see interactions among clusters in chalcogen-rich Ge1?x(S, or Se)x glasses. 相似文献
73.
Kai Shoichi Fukunaga Hidehiko Brand Helmut R. 《Journal of statistical physics》1989,54(5-6):1133-1152
We study the influence of external multiplicative noise on the electrohydrodynamic instability (EHD) in nematic liquid crystals. It turns out that the correlation time
n
and the intensityQ of the noise are the crucial parameters to control the system. Different types of noise lead to minor quantitative changes when compared to Gaussian white noise, leaving the qualitative aspects unchanged. With increasing noise intensity the threshold for the onset of the first instability changes drastically. We observe that the curvature arising when the threshold of the various instabilities is plotted as a function of the noise intensity changes as one is going, e.g., from the onset of Williams domains (WD) to the onset of the grid pattern (GP). This result reflects the transition in the flow structure from two-dimensional (WD) to three-dimensional (GP, DSM) flow patterns. As the intensity of the noise is increased further, the onset of the first instability becomes more complex. The measurement of the nonlinear onset time shows a strong dependence on the noise intensityQ, which is linear for WD and GP well above onset. The linear onset time shows an unexpected dependence on the noise intensity close to the onset of the first instability. For sufficiently long correlation times of the noise, a destabilization by noise is obtained. 相似文献
74.
75.
Akemi Fukunaga Yoshio Hatta Masataka Ishibashi Hiroshi Miyazaki 《Journal of chromatography. A》1980,190(2)
The gas chromatographic separation of the DMAS ether derivatives of ten bile acid methyl esters, namely DMES, DMnPS and DMiPS ethers, have been studied by use of an open tubular glass capillary column, coated with SE-30. The DMAS ether derivatives were eluted in sequence according to the number of hydroxyl groups except for 12-KCDCA, and separated. This contrasts with the poorly resolved gas chromatographic peaks produced by the TMS ether derivatives. The DMES ether derivatives were resolved with baseline separation in 30 min, but those of HCA and 12-KCDCA had similar methylene unit values. 相似文献
76.
Semi-quantitative method of N-isopropyl-(123I)-p-iodoamphetamine (123I-IMP) accumulation in cerebrum by using 123I-IMP SPECT was tried. Ratio of counts in whole cerebrum to those in normal cerebellum was calculated, and this accumulation is defined as cerebrum to cerebellum accumulation ratio. In group of patients with dementia or patients who were remaining in bed, significantly low accumulation ratio was observed, while in "normal" group, no differences in sex and aging were observed. Calculation of cerebrum to cerebellum accumulation ratio was concluded as a useful method of evaluating the accumulation of 123I-IMP in cerebrum. 相似文献
77.
Setsuo Kashino Takeo Fukunaga Hironobu Izutsu Shiho Miyashita 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(5):627-631
2‐Pyridone (2‐oxopyrimidine) forms hydrogen‐bonded complexes with dicarboxylic acids, the molar ratio of 2‐pyridone/dicarboxylic acid being 2:1 for the complexes with oxalic acid (ethanedioic acid), 2C5H5NO·C2H2O4, (I), and trans‐β‐hydromuconic acid (trans‐hex‐3‐enedioic acid), 2C5H5NO·C6H8O4, (II), and 1:1 for the complexes with trans‐glutaconic acid (trans‐pent‐2‐enedioic acid), C5H5NO·C5H6O4, (III), and l ‐tartaric acid (l ‐2,3‐dihydroxybutanedioic acid), C5H5NO·C4H6O6·H2O, (IV). Common features in the hydrogen‐bonding patterns were found for the centrosymmetric and non‐centrosymmetric acids, respectively. The 2‐pyridone molecule takes the lactam form in these crystals. 相似文献
78.
Takuro Fukunaga 《Discrete Mathematics》2012,312(15):2349-2355
79.
80.
In this study, a new synthetic approach to 4,5-branched Kdo trisaccharides based on the common acceptor Kdo(α2-4)Kdo was developed. The synthesis of three types of 4,5-branched trisaccharides, Hep(α1-5)[Kdo(α2-4)]Kdo, Man(α1-5)[Kdo(α2-4)]Kdo, and GalNAc(α1-5)[Kdo(α2-4)]Kdo, was achieved in good yield and high α-selectivity. 相似文献