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排序方式: 共有175条查询结果,搜索用时 15 毫秒
81.
Yuta Morishita Kaoru Ikeda Hiroaki Matsuno Hideyuki Ito 《Natural product research》2019,33(10):1472-1476
Quercetin, luteolin and chrysoeriol were identified from rooibos tea as degranulation inhibitors in rat basophilic leukaemia cells. The degranulation inhibitory activity of chrysoeriol was first discovered in the present study. When quercetin, luteolin and chrysoeriol were mixed in the ratio that occurs in rooibos tea extract, the mixture inhibited antigen- and calcium ionophore-stimulated degranulation to the same degree as that by the whole rooibos tea extract. These findings indicate that these three flavonoids are the key factors underlying the degranulation inhibitory activity of rooibos tea. 相似文献
82.
Zhe Sun Tatsuru Mio Tomohiko Okada Taisuke Matsuno Sota Sato Hirohiko Kono Hiroyuki Isobe 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(7):2062-2066
In the design of machinery such as steel bearings, a fundamental understanding of material characteristics provides an indispensable basis for the design. Although hydrocarbon cycloarylenes have started to be used for providing unique supramolecular bearings with anomalous dynamic behaviors, their fundamental understanding is immature. A unique property of the cycloarylene host is now reported: the cyclic host is so pliable that it tracks the orientational changes of the ellipsoidal guest, that is, C70 fullerene. Unique structures of the complex were revealed by spectroscopic and crystallographic analyses, and additional theoretical investigations deepened our understanding by revealing the structural changes associated with unbiased rotational motions. 相似文献
83.
Taisuke Matsuno Kengo Fukunaga Sota Sato Hiroyuki Isobe 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(35):12298-12302
Upon encapsulating an oval‐shaped hydrocarbon guest, a cylindrical host deforms its shape to maximize intermolecular contacts. Structure–assembly relationship studies with a series of hydrocarbon guests disclosed the importance of molecular shapes and CH–π contacts. Multiple contacts and weak CH–π hydrogen bonds resulted in an optimal assembly; however, the shape deformation resulted in severe retardation of rotational motions in the crystal. Thus, unlike a circular guest, the oval‐shaped guest did not change its orientation in the host. Unexpectedly, the planar guest did not affect the packing structure to form a double helix in intertwined host arrays. 相似文献
84.
Becker-Szendy R Bratton CB Cady DR Casper D Claus R Crouch M Dye ST Gajewski W Goldhaber M Haines TJ Halverson PG Jones TW Kielczewska D Kropp WR Learned JG LoSecco JM McGrew C Matsuno S Mudan MS Price L Reines F Schultz J Sinclair D Sobel HW Stone JL Sulak LR Svoboda R Thornton G van der Velde JC 《Physical review D: Particles and fields》1990,42(9):2974-2976
85.
Hidetoshi Nishimori Kenn Kubo Yukiyasu Ozeki Yasuhiro Tomita Tatsuya Kishi 《Journal of statistical physics》1989,55(1-2):259-277
The existence of long-range order is proved under certain conditions for the antiferromagnetic quantum spin system with anisotropic interactions (XXZ model) on the simple cubic or the square lattice. In three dimensions (the simple cubic lattice), finite long-range order exists at sufficiently low temperatures for any anisotropy(0) ifS1, and for 0<0.29 (XY-like) or>1.19 (Ising-like) ifS=1/2. In two dimensions (the square lattice), ground-state long-range order exists under the following conditions: for any anisotropy (0) ifS3/2; 0<0.032 (XY-like) or 0.67<<1.34 (almost isotropic) or>1.80 (Ising-like) ifS=1;>1.93 (Ising-like) ifS=1/2. We conjecture that the two-dimensional spin-1/2XY model (=0) has finite ground-state long-range order. Numerical evidence supporting this conjecture is given. 相似文献
86.
Toshihide Matsuno Sachie Horii Takanobu Sato Yoshiki Matsumiya Motoki Kubo 《Applied biochemistry and biotechnology》2013,169(3):795-809
Accumulations of inorganic nitrogen (NH4 +, NO2 ?, and NO3 ?) were analyzed to evaluate the nitrogen circulation activity in 76 agricultural soils. Accumulation of NH4 + was observed, and the reaction of NH4 +?→?NO2 ? appeared to be slower than that of NO2 ??→?NO3 ? in agricultural soil. Two autotrophic and five heterotrophic ammonia-oxidizing bacteria (AOB) were isolated and identified from the soils, and the ammonia-oxidizing activities of the autotrophic AOB were 1.0?×?103–1.0?×?106 times higher than those of heterotrophic AOB. The relationship between AOB number, soil bacterial number, and ammonia-oxidizing activity was investigated with 30 agricultural soils. The ratio of autotrophic AOB number was 0.00032–0.26 % of the total soil bacterial number. The soil samples rich in autotrophic AOB (>1.0?×?104 cells/g soil) had a high nitrogen circulation activity, and additionally, the nitrogen circulation in the agricultural soil was improved by controlling the autotrophic AOBs. 相似文献
87.
Matsuno T Karo M Sasahara H Watanabe T Inaba M Takahashi M Yaguchi SI Yoshioka K Sakato M Kawashima S 《Chemical & pharmaceutical bulletin》2000,48(11):1778-1781
Triamino-substituted 1,3,5-triazine and pyrimidine derivatives were synthesized and tested for antitumor activities using some human cancer cell lines and murine leukemia cell lines. All the compounds having benzimidazolyl and morpholino groups as substituents on the 1,3,5-triazine ring showed antitumor activity. Pyrimidine derivatives having the same groups as substituents also showed antitumor activity. Among them, the compounds having 1-benzimidazolyl, morpholino and cis-2,3-dimethylmorpholino groups as substituents on the 1,3,5-triazine ring or pyrimidine ring exhibited the most potent antitumor activity, and these compounds exhibited no or very weak aromatase inhibitory activity. In contrast, the compounds having imidazolyl group instead of benzimidazolyl group as a substituent on the 1,3,5-triazine ring showed a potent aromatase inhibitory activity. 相似文献
88.
J. Kikuma M. Tsunashima S. Matsuno K. Matsui 《Journal of solid state chemistry》2011,184(8):2066-2074
Hydrothermal synthesis process of tobermorite (5CaO·6SiO2·5H2O) has been investigated by in-situ X-ray diffraction using high-energy X-rays from a synchrotron radiation source in combination with a purpose-build autoclave cell. Dissolution rates of quartz were largely affected by its particle size distribution in the starting mixtures. However, the composition (Ca/Si) of non-crystalline C-S-H at the start of tobermorite formation was identical regardless of the quartz dissolution rate. An effect of water-to-solid ratio (w/s) was investigated for samples using fine particle quartz. Tobermorite did not occur with w/s of 1.7 but occurred with w/s higher than 3.0. Surprisingly, however, the dissolution curves of quartz were nearly identical for all samples with w/s from 1.7 to 9, indicating that the dissolution rate is predominated by surface area. Possible reaction mechanism for tobermorite formation will be discussed in terms of Ca and/or silicate ion concentration in the liquid phase and distribution of Ca/Si in non-crystalline C-S-H. 相似文献
89.
90.
Yano M Matsuhira K Tatsumi M Kashiwagi Y Nakamoto M Oyama M Ohkubo K Fukuzumi S Misaki H Tsukube H 《Chemical communications (Cambridge, England)》2012,48(34):4082-4084
A triarylamine-functionalized terpyridine ligand formed a highly coordinated complex with europium tris(β-diketonate), which displayed reversible 'ON-OFF' luminescence switching coupled with a ligand redox process of triarylamine/triarylaminium cations. 相似文献