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RISS 인기검색어
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- 저자 : Y. Kojima (검색결과 22 건)
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Yano, Y.,Kojima, T.,Fukuzumi, S. Elsevier Sequoia [etc.] 2011 Inorganica chimica acta Vol.374 No.1
A novel TPA derivative (TPA=tris(2-pyridylmethyl)amine) having two 1,10-phenanthroline (phen) moieties via amide linkage was synthesized and this ligand reacted with [Ru(hmb)Cl<SUB>2</SUB>]<SUB>2</SUB> (hmb: hexamethylbenzene) to give a trinuclear Ru(II) complex, [RuCl(TPA-{phenRuCl(hmb)}<SUB>2</SUB>-H<SUP>+</SUP>)](PF<SUB>6</SUB>)<SUB>2</SUB> (1-Cl), in a moderate yield. The complex involves a deprotonated and oxygen-coordinated amide linkage, which exhibits reversible protonation-deprotonation equilibrium. The chlorido complex was converted to be an aqua complex, [Ru(H<SUB>2</SUB>O)(TPA-{phenRu(H<SUB>2</SUB>O)<SUB>2</SUB>(hmb)}<SUB>2</SUB>-H<SUP>+</SUP>)](SO<SUB>4</SUB>)<SUB>5/2</SUB> (1-H<SUB>2</SUB>O), by the reaction of 1-Cl with Ag<SUB>2</SUB>SO<SUB>4</SUB> in H<SUB>2</SUB>O. Transfer hydrogenation of ketones was examined by using 1-Cl as a catalyst and HCOONa as a hydride source in H<SUB>2</SUB>O/CH<SUB>3</SUB>OH (1:1 v/v) at 50<SUP>o</SUP>C under Ar. The time-course of the transfer hydrogenation of cyclohexanone to give cyclohexanol revealed that 1-Cl showed a cooperative effect on the catalytic reactivity as compared with that of mononuclear [RuCl(hmb)(phen)] (3-Cl) and [RuCl((1-Naph)<SUB>2</SUB>-TPA)]PF<SUB>6</SUB> in H<SUB>2</SUB>O/CH<SUB>3</SUB>OH (1:2 v/v) under the same conditions. The detailed kinetic study has revealed that the catalytic transfer hydrogenation proceeds via the formato complex, which interacts with a substrate rather than via the hydrido complex. The two Ru centers placed at close proximity in 1-H<SUB>2</SUB>O enhanced the interaction of the formato complex with a substrate, resulting in an increase in the catalytic reactivity as compared with the mononuclear complex.
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atsushi Kojima,A. Itakura,H. Kakiuchi,H. Higaki,K. Ishii,M. Ichimura,M. Yoshikawa,N. Kaidou,S. Fujimoto,T. Cho,T. Yamaguchi,Y. Miyata 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The radial particle flux induced by drift-type fluctuations is observed by use of a gold neutral beam probe in the tandem mirror GAMMA 10. When the drift waves are excited in the plasma, the measured phase difference between the density and potential fluctuations is not zero; the radial profile of the phase difference is not constant. This showed that the radial particle flux had some profile and then the density profile would be varied due to the radial particle transport induced by the fluctuations through the radial particle flux. Experimental results showed the density reduction due to the transport induced by the drift-type fluctuations. The phase difference is an important parameter to decide the radial particle flux. The profiles of the phase difference are measured to understand the decision mechanism of the phase difference. The radial profile of the phase difference is varied by the ion heating power, the density and the potential profiles. As a result, the phase difference had a correlation with the difference between the local drift frequency (the electron diamagnetic drift frequency and the E×B drift frequency) and the observed frequency.
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Li, E.,Kim, Y.,Kim, S.,Sato, T.,Kojima, M.,Park, S. Academic Press 2014 Experimental neurology Vol.252 No.-
Ghrelin has been shown to regulate neurogenesis in the hippocampus. The aim of this study was to investigate the possible influence of ghrelin on cell proliferation and neuroblast formation in the subventricular zone (SVZ) and rostral migratory system (RMS) and generation of interneurons in the olfactory bulb (OB). We found that ghrelin receptors were expressed in the SVZ-RMS-OB system. Ghrelin knockout (GKO) mice have fewer proliferating neural progenitor cells and neuroblasts in the SVZ, while ghrelin administration attenuated these changes. We also found that not only the number of BrdU-labeled cells but also the fraction of migratory neuroblasts in the RMS was decreased in the GKO mice compared with controls. Treatment of GKO mice with ghrelin restored these numbers to the wild-type control values. Far fewer BrdU/NeuN double-labeled cells were found in the OB of GKO mice than in wild-type mice 4weeks after labeling, which were increased by ghrelin replacement. GKO mice showed less numbers of BrdU/calbindin, BrdU/calretinin and BrdU/tyrosine hydroxylase double-labeled cells in the periglomerular layer of the OB. However, these numbers were increased to wild-type values after ghrelin administration. Finally, in the GH-deficient spontaneous dwarf rats, ghrelin increased the number of progenitor cells and neuroblasts in the SVZ, without significant effect on the differentiation in the OB. These findings suggest that ghrelin is involved in the regulation of proliferation of progenitor cells in the SVZ, the number of migratory neuroblasts in the SVZ, and the differentiation of interneurons in the OB.
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EFFECT OF PLANT PHENOLIC ACIDS ON CELLULOLYTIC ACTIVITY OF MIXED RUMEN POPULATIONS
Ushida, K.,Watase, H.,Kojima, Y. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.1
Influences of plant phenolic acids and their possible metabolites(non-phenolic aromatic acids involved) in the rumen on the cellulolytic activity of mixed rumen populations were examined by a simple in vitro culture technique. Initial concentrations of aromatic acids were 1, 5, 10 and 20 mM/l. All the tested aromatic acids reduced microbial cellulose digestion especially at the higher initial concentration. P-Coumaric acid, ferulic acid and cinnamic acid, those having unhydrogenated propenoic side chain were more inhibitory than were 3-phenylpropinic acid and phloretic acid, those having hydrogenated propanoic side chain. Lag-time for cellulose digestion was prolonged by former three acids by 16 h. Apparent reduction in p-coumaric acid concentration was observed at 24 h when cellulose digestion began. Volatile fatty acid productions from cellulose fermentation were shifted by former three aromatic acids to produce more acetate and less propionate. This suggests that the selection of celluloytic organisms was induced by these aromatic acids.
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Effect of Dietary Concentrate on Fungal Zoosporogenesis in Sheep Rumen
Matsui, H.,Ushida, K.,Kojima, Y. Asian Australasian Association of Animal Productio 1997 Animal Bioscience Vol.10 No.6
Fluctuation of fungal zoospores on agar strips were observed in the rumen of sheep fed three different levels of dietary concentrate, timothy hay: concentrate = 3:0 (AF diet), timothy hay: concentrate = 2:1 (MC diet), timothy hay : concentrate = 1:2 (HC diet) respectively. The number of zoospores on the strip was drastically decreased after morning feed with AF diet. The number was the highest at 0 h ($1.34{\times}10^2/cm^2$), then declined to $2.0{\times}10^3/cm^2$ at 9 h after feeding. In the rumen of animals fed MC diet, the number of zoospores decreased with time after feeding, although the decrement was slower than that with AF diet. During 0-3 h after feeding, number of zoospores was $1.6{\times}10^4/cm^2$. Although the number slightly decreased at 6 and 9 h, relatively high levels were maintained. It seems that the inducers for zoospore-release were maintained at relatively high concentration throughout incubation period. The fluctuation pattern of number of germinated zoospores was different in the rumen of animals fed HC diet from those of AF and MC diets. The number of zoospores was constantly maintained at lower level ($1.0{\times}10^3/cm^2$) than the other diets. For MC diet, continuous high number of germinated zoospores may be due to the continuous release of zoospores by hemes in timothy hay and concentrate feed, and by unknown mechanisms. Unlike AF diet which promoted relatively rapid decline of zoosporogenesis, supplementation of concentrate feed to the timothy hay did not promote such rapid decline of zoosporogenesis. It was suggested that release of inducers for zoosporogenesis from concentrate feed persisted longer time than from timothy hay. HC diet promoted the lowest zoospore production, suggested the lowest fungal population size in this experiment. These results show that an appropriate amount of concentrate may support fungal growth and stimulate zoosporogenesis in the rumen.
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X-ray and Neutron Structure Analysis of MeHPLN in the Low Temperature Phase
R. Kiyanagi,A. Kojima,H. Kimura,M. Watanabe,S. Kumazawa,T. Sugawara,T. Hayashide,T. Mochida,Y. Noda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Structure analyses of 5-Methyl-9-hydroxyphenalenon(C14H10O2, MeHPLN) in the low temperature phase were performed by X-ray and neutron scattering experiments. It is found that the space group is P21/c with a super cell (a 2b c) and there are two types of molecules in the unit cell. In one of the independent molecules, hydrogen atoms in hydrogen-bond region occupy two sites as same as in the room temperature phase. On the other hand, in another independent molecules, hydrogen atoms in hydrogen-bond region clearly show ordering feature. In these ordered hydrogen atoms, there are obvious discrepancy beween electron and nuclear distribution, and hence static electrical dipolemoments exist in hydorgen-bond region with an antiferroelectric ordering.
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Shin, D.M.,Hwang, Y.H.,Ko, J.H.,Kojima, S. Elsevier 2015 Current Applied Physics Vol.15 No.9
Relaxation behaviors of enantiomorphic S-ibuprofen were investigated in its amorphous state by using dielectric and photon correlation spectroscopies. The dielectric relaxation processes of the S-ibuprofen were nearly identical to those of the racemic RS-ibuprofen. The relaxation parameters and the dielectric strengths of the α-process and the D-process for the S-ibuprofen were very similar to those for the RS-ibuprofen. These results indicate that the stereochemistry of ibuprofen molecules do not have any substantial effect on molecular motions in the amorphous state of ibuprofen. The relaxation times of the main relaxation process probed by using the photon correlation spectroscopy were consistent with those of the dielectric α-process. The fragility of the S-ibuprofen was 76, which was nearly the same to that determined based on the thermal relaxation times and smaller than that of the racemic compound.
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