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排序方式: 共有267条查询结果,搜索用时 375 毫秒
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Takeda A Yokoyama Y Ito S Miyazaki T Shimotani H Yakigaya K Kakiuchi T Sawa H Takagi H Kitazawa K Dragoe N 《Chemical communications (Cambridge, England)》2006,(8):912-914
The synthesis of a mg amount of pure argon containing fullerene allowed the synthesis of the first endohedral superconductors with critical temperatures lower than expected, an indication of the strong influence of the argon atom on the C60 cage. 相似文献
44.
Hirao Shigekazu Kakiuchi Hideki Akata Naofumi Tamari Toshiya Sugihara Shinji Shima Nagayoshi Yokoyama Sumi Tanaka Masahiro 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(7):3077-3083
Journal of Radioanalytical and Nuclear Chemistry - This paper discusses the spatiotemporal variation in atmospheric tritiated water (HTO) concentration near the Fukushima Daiichi Nuclear Power... 相似文献
45.
Kitani S Sugawara K Tsutsumi K Morimoto T Kakiuchi K 《Chemical communications (Cambridge, England)》2008,(18):2103-2105
3-Arylthiochromone derivatives were synthesized as new photolabile protecting groups, in which the photoreactivity was switchable based on oxidation of the sulfur atom (sulfide and sulfone); the protected substrates , released the corresponding alcohols, amines or carbonxylic acids almost quantitatively under UV-light in neutral condition and the photoproduct showed high fluorescence intensity. 相似文献
46.
Terumichi Enomoto Mifuyu Ueno Yumi Shimada Ryuichi Shirai Kiyomi Kakiuchi 《Tetrahedron》2008,64(18):4051-4059
We report here on the construction of the ABC-ring framework of (±)-Taxol using an intramolecular aldol reaction as a key step. AB-ring compound 8 was converted to ketoaldehyde 25 as a precursor of an aldol reaction via introduction of oxygen-functionalities and a methoxycarbonyl group, which can be converted to a methyl group, in the proper positions of the B-ring. An aldol reaction of ketoaldehyde with LDA led to the formation of the desired product 27, which corresponds to the ABC-ring framework of (±)-Taxol. 相似文献
47.
Na-Oki Ikenaga Tomonari Kiyomi Itaru Yonezawa Chieko Yukawa Toshimitsu Suzuki 《Research on Chemical Intermediates》2008,34(5-7):603-615
Hydrogenation reactions of alkenes (cyclohexene, ethyl acrylate, styrene and 1,5-cyclooctadiene) and aromatic compounds (o-, m- and p-xylene) were carried out in order to examine the activity of palladium-loaded surface-oxidized diamond (Pd/O-Dia) catalyst in liquid-phase hydrogenation. The catalytic performance was compared to commercial palladium-loaded activated carbon (Pd/C) catalyst. The catalyst activities were evaluated by conversions of reactants and H2 uptake rates in the early stage of the reaction. In all the hydrogenation reactions of alkenes and aromatic compounds, the activity of Pd/O-Dia was almost the same as or slightly higher than that of Pd/C. Dispersion of Pd metal was measured by a CO-pulsed adsorption technique and TEM observations of the catalysts. Pd dispersions were on the same order of magnitude according to the CO-pulsed adsorption technique, although the Pd/C catalyst had a higher surface area (718 m2/g) than that of Pd/O-Dia (23 m2/g). The Pd particle sizes on O-Dia measured by TEM observation were slightly smaller than those on the activated carbon. Such highly dispersed Pd particles on O-Dia would contribute to higher activity for the hydrogenation reaction of alkenes and aromatic compounds. 相似文献
48.
Kashiwada A Matsuda K Mizuno T Tanaka T 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(24):7343-7350
In many viruses, pH-responsive coiled-coil domains in the specific fusion proteins play important roles in membrane fusion and the infection of viruses into host cells. To investigate the relationship between the conformational change of the coiled coil and the fusion process, we have introduced a de novo designed polypeptide as a model system of the coiled-coil domain. This system enables the systematic study of the dynamics of pH-responsive coiled-coil polypeptide-membrane interactions. First, we designed and synthesized pH-responsive isoleucine-zipper triple-stranded coiled-coil polypeptides. Then the relationship between the pH-induced conformational change of the polypeptide and the membrane's interactive properties was studied by physicochemical methods. Structural changes in the designed polypeptides were examined by means of circular dichroism measurements. And finally, the behavior of the membrane fusion was investigated by leakage of liposomal contents, turbidity analysis, dynamic light scattering, and lipid mixing experiments. Our data show that coiled-coil formation under acidic pH conditions enhances polypeptide-induced membrane fusion. The results in this study demonstrate that an artificial membrane fusion system can be constructed on a molecular level by the use of a pH-responsive isoleucine-zipper triple-stranded coiled-coil polypeptide. 相似文献
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Ishimatsu R Shigematsu F Hakuto T Nishi N Kakiuchi T 《Langmuir : the ACS journal of surfaces and colloids》2007,23(2):925-929
The structure of the electrical double layer on the aqueous solution side has been studied by measuring electrocapillary curves at the polarized interface between a room-temperature ionic liquid (RTIL), tetrahexylammonium bis(trifluoromethylsulfonyl)imide, and water (W) at different concentrations of LiCl. Thermodynamic analysis of the electrocapillary curves indicates that Li+ ions negatively adsorb at the point of zero charge. The adsorption of Li+ and Cl- ions in the polarized potential window of about 200 mV can be explained by the Gouy's double layer model, and the specific adsorption of Li+ and Cl- ions at the RTIL|W interface is negligible within the polarized potential window. 相似文献