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Light-induced Li extraction from LiMn$$_{2}$$O$$_{4}$$/TiO$$_{2}$$ in a water-in-salt electrolyte for photo-rechargeable batteries

下川 航平*; 松原 翔吾*; 岡本 章玄*; 市坪 哲

Chemical Communications, 58(69), p.9634 - 9637, 2022/09

 被引用回数:3 パーセンタイル:67.48(Chemistry, Multidisciplinary)

Photocharging of high-potential spinel LiMn$$_{2}$$O$$_{4}$$ is demonstrated by using a water-in-salt electrolyte and TiO$$_{2}$$ nanoparticles. In a developed half-cell system with an electron acceptor, Li extraction from LiMn$$_{2}$$O$$_{4}$$ proceeds under the illumination of UV-visible light at an estimated rate of c.a. 23 mA g$$^{-1}$$. This work paves the way for highpotential cathode materials in photo-rechargeable batteries.


The Catalytic mechanism of decarboxylative hydroxylation of salicylate hydroxylase revealed by crystal structure analysis at 2.5${AA}$ resolution

上村 拓也*; 喜田 昭子*; 渡邉 佳彦*; 安達 基泰; 黒木 良太; 森本 幸生*

Biochemical and Biophysical Research Communications, 469(2), p.158 - 163, 2016/01

 被引用回数:14 パーセンタイル:51.67(Biochemistry & Molecular Biology)

The X-ray crystal structure of a salicylate hydroxylase from ${it Pseudomonas putida}$ S-1 complexed with coenzyme FAD has been determined to a resolution of 2.5${AA}$. Structural conservation with $$p$$- or $$m$$-hydroxybenzoate hydroxylase is very good throughout the topology, despite a low amino sequence identity of 20-40% between these three hydroxylases. Salicylate hydroxylase is composed of three distinct domains and includes FAD between domains I and II, which is accessible to solvent. In this study, which analyzes the tertiary structure of the enzyme, the unique reaction of salicylate, i.e. decarboxylative hydroxylation, and the structural roles of amino acids surrounding the substrate, are considered.


Internal dynamics of F-actin and myosin subfragment-1 studied by quasielastic neutron scattering

松尾 龍人; 荒田 敏昭*; 小田 俊郎*; 中島 健次; 河村 聖子; 菊地 龍弥; 藤原 悟

Biochemical and Biophysical Research Communications, 459(3), p.493 - 497, 2015/04

 被引用回数:4 パーセンタイル:14.04(Biochemistry & Molecular Biology)

Various biological functions related to cell motility are driven by the interaction between the partner proteins, actin and myosin. To obtain insights into how this interaction occurs, the internal dynamics of F-actin and myosin subfragment-1 (S1) were characterized by quasielastic neutron scattering measurements on the solution samples of F-actin and S1. Contributions of the internal motions of the proteins to the scattering spectra were separated from those of the global macromolecular diffusion. Analysis of the spectra arising from the internal dynamics showed that the correlation times of the atomic motions were about two times shorter for F-actin than for S1, suggesting that F-actin fluctuates more rapidly than S1. It was also shown that the fraction of the immobile atoms is larger for S1 than for F-actin. These results suggest that F-actin actively facilitates the binding of myosin by utilizing the more frequent conformational fluctuations than those of S1.


Highly durable carbon-supported Pt catalysts prepared by hydrosilane-assisted nanoparticle deposition and surface functionalization

齋藤 彰範*; 辻 広美*; 下山 巖; 清水 研一*; 仁科 勇太*

Chemical Communications, 51(27), p.5883 - 5886, 2015/04

 被引用回数:12 パーセンタイル:40.14(Chemistry, Multidisciplinary)



Chemical repair of base lesions, AP sites, and strand breaks on plasmid DNA in dilute aqueous solution by ascorbic acid

端 邦樹; 漆原 あゆみ; 山下 真一; 鹿園 直哉; 横谷 明徳; 勝村 庸介*

Biochemical and Biophysical Research Communications, 434(2), p.341 - 345, 2013/05

 被引用回数:8 パーセンタイル:25.42(Biochemistry & Molecular Biology)

In order to clarify whether ascorbic acid, which is a major antioxidant in living systems, chemically repairs radiation damage to DNA. We quantified the yields of base lesions, AP sites and single strand breaks (SSBs) produced in plasmid DNA by $$gamma$$-irradiation in the presence of ascorbic acid with concentrations of 10-100 $$mu$$MM. By comparing the suppression efficiencies to the induction of each DNA lesion, it was found that ascorbic acid promotes the chemical repair of precursors of AP-sites and base lesions more effectively than those of single strand breaks. We estimated the efficiency of the chemical repair of each lesion using a kinetic model. Approximately 50-60% of base lesions and AP-sites were repaired by 10 $$mu$$M ascorbic acid, although strand breaks were largely unrepaired by ascorbic acid at low concentrations. The methods in this study will provide a route to understanding the mechanistic aspects of antioxidant activity in living systems.


Coupling of the hydration water dynamics and the internal dynamics of actin detected by quasielastic neutron scattering

藤原 悟; Plazanet, M.*; 小田 俊郎*

Biochemical and Biophysical Research Communications, 431(3), p.542 - 546, 2013/02

 被引用回数:4 パーセンタイル:11.84(Biochemistry & Molecular Biology)

Quasi-elastic neutron scattering experiments of powder samples of F-actin and G-actin, hydrated either with D$$_{2}$$O or H$$_{2}$$O, at hydration ratios of 0.4 and 1.0, were performed. Combined analysis of the quasi-elastic neutron scattering spectra provided the parameters characterizing the water dynamics in the first hydration layer and those outside of the first layer. The translational diffusion coefficients (D$$_{T}$$) of the hydration water in the first layer were found to be 1.2 $$times$$ 10$$^{-5}$$ cm$$^{2}$$/s and 1.7 $$times$$ 10$$^{-5}$$ cm$$^{2}$$/s for F-actin and G-actin, respectively, while that for bulk water was 2.8 $$times$$ 10$$^{-5}$$ cm$$^{2}$$/s. The residence times were 6.6 ps and 5.0 ps for F-actin and G-actin, respectively, while that for bulk water was 0.63 ps. These differences between F-actin and G-actin, indicating that the hydration water around G-actin is more mobile than that around F-actin, are in concert with the results of the internal dynamics of F-actin and G-actin, showing that G-actin fluctuates more rapidly than F-actin. This implies that the dynamics of the hydration water is coupled to the internal dynamics of the actin molecules. The D$$_{T}$$ values of the water molecules outside of the first hydration layer were found to be similar to that of bulk water though the residence times are strongly affected by the first hydration layer. This supports the recent observation on intracellular water that shows bulk-like behavior.


Thermodynamic considerations on the purification of H$$_{2}$$SO$$_{4}$$ and HIx phases in the iodine-sulfur hydrogen production process

Wang, L.*; 今井 良行; 田中 伸幸; 笠原 清司; 久保 真治; 小貫 薫

Chemical Engineering Communications, 199(2), p.165 - 177, 2012/02

 被引用回数:9 パーセンタイル:33.55(Engineering, Chemical)



Thermochromic properties of low-melting ionic uranyl isothiocyanate complexes

青柳 登; 下条 晃司郎; Brooks, N. R.*; 永石 隆二; 長縄 弘親; Van Hecke, K.*; Van Meervelt, L.*; Binnemans, K.*; 木村 貴海

Chemical Communications, 47(15), p.4490 - 4492, 2011/04

 被引用回数:41 パーセンタイル:70.31(Chemistry, Multidisciplinary)

Temperature-dependent yellow-to-red colour changes of uranylthiocyanate complexes with 1-alkyl-3-methylimidazolium cations have been studied by different spectroscopic methods and this phenomenon is attributed to changes in the local environment of the uranyl ion, including the coordination number, as well as to cation - anion interactions.


Functional aberration of myofibrils by cardiomyopathy-causing mutations in the coiled-coil region of the troponin-core domain

松本 富美子; 前田 佳代*; 茶竹 俊行*; 前田 雄一郎*; 藤原 悟

Biochemical and Biophysical Research Communications, 382(1), p.205 - 209, 2009/04

 被引用回数:15 パーセンタイル:38.9(Biochemistry & Molecular Biology)

心筋症発症に関連する筋収縮調節蛋白質トロポニンT(TnT)の2種類の変異体(E244D, K247R)の変異部位は、Tn-コア領域のコイルドコイル領域に存在する。この領域の変異がTnの調節機構に及ぼす影響を明らかにするために、TnTのこの部位でのさまざまな変異体を含む筋原繊維のカルシウム依存性ATP分解活性を測定した。その結果、疾病関連変異体E244Dは、カルシウム感受性を変化させずに最大ATP分解活性を増大させることを確認するとともに、変異体K247Rも同様の効果を持つことを初めて明らかにした。さらにさまざまな変異体(E244D, E244M, E244A, E244K, K247R, K247E, and K247A)は、カルシウム感受性の変化はないが、最大ATP分解活性についてさまざまな影響を与えることが明らかとなった。これらの変異体を含むTnコアの分子動力学計算の結果、変異部位付近の水素結合ネットワークがTnの機能発現に重要であることが示唆された。


Analysis of internal motions of interleukin-13 variant associated with severe bronchial asthma using $$^{15}$$N NMR relaxation measurements

吉田 雄一郎*; 大栗 誉敏*; 武田 知香*; 黒木 良太; 出原 賢治*; 井本 泰治*; 植田 正*

Biochemical and Biophysical Research Communications, 358(1), p.292 - 297, 2007/06

 被引用回数:4 パーセンタイル:10.14(Biochemistry & Molecular Biology)



A Remote valency control technique; Catalytic reduction of Uranium(VI) to Uranium(IV) by external ultrasound irradiation

虎石 貴; 木村 貴海; 有阪 真

Chemical Communications, (3), p.240 - 241, 2007/01



Regioselectivity control of radiation-induced reaction; Electron beam-induced Fries rearrangement of sulfonamide within $$beta$$-cyclodextrin inclusion complex

加藤 順*; 掛端 博之*; 前川 康成; 山下 俊*

Chemical Communications, (43), p.4498 - 4500, 2006/11



Selective separation of Am(III) from lanthanides(III) by solvent extraction with hydrophobic field of "superweak" anion

長縄 弘親; 鈴木 英哉*; 野呂 純二*; 木村 貴海

Chemical Communications, (23), p.2963 - 2965, 2005/06



PprI: A General switch responsible for extreme radioresistance of ${it Deinococcus radiodurans}$

Hua, Y.*; 鳴海 一成; Gao, G.*; Tian, B.*; 佐藤 勝也; 北山 滋; Shen, B.*

Biochemical and Biophysical Research Communications, 306(2), p.354 - 360, 2003/06

 被引用回数:145 パーセンタイル:95.66(Biochemistry & Molecular Biology)

放射線抵抗性細菌デイノコッカス・ラジオデュランスの放射線高感受性変異株の解析から、DNAの修復と損傷防御機構を担う主要スイッチタンパク質PprIを同定した。放射線高感受性変異株では、この遺伝子がトランスポゾンの挿入によって機能を失っていた。この遺伝子を完全に破壊すると放射線感受性が増大し、野生型遺伝子を導入すると放射線耐性が復帰した。放射線照射に伴い、PprIは${it recA}$遺伝子及び${it pprA}$遺伝子の発現を誘導するとともに、カタラーゼ活性をも助長した。これらの結果は、PprIタンパク質が、放射線応答におけるDNAの修復と防御の調節機構に重要な役割を果たしていることを強く示唆している。


Luminescence study of tetravalent uranium in aqueous solution

桐島 陽*; 木村 貴海; 杤山 修*; 吉田 善行

Chemical Communications, (7), p.910 - 911, 2003/04



Radiation-induced reactions $$via$$ the lowest excited states in cinnamic acid crystals

前川 康成; 稲葉 伯至; 保々 広樹; 成田 正*; 越川 博; Moon, S.; 加藤 順; 吉田 勝

Chemical Communications, (18), p.2088 - 2089, 2002/09



Photopromoted oxidative cyclization of an o-phenylene-bridged schiff base via a manganese(III) complex, leading to a fluorescent compound, 2-(2-hydroxyphenyl)benzimidazole

坂本 文徳; 福田 貴志*; 佐藤 稔*; 仲野 義晴*; X.S.Tan*; 藤井 有起*

Chemical Communications, (13), p.1391 - 1392, 1998/00



Hydration structure of Eu$$^{III}$$ on aqueous ion-exchange resins using laser-induced fluorescence spectroscopy

高橋 嘉夫*; 木村 貴海; 加藤 義春; 薬袋 佳考*; 富永 健*

Chemical Communications, (2), p.223 - 224, 1997/00



Laser-induced enantiodifferentiating reaction of tartaric acid using high-intensity circularly polarized light

清水 雄一; 河西 俊一

Chemical Communications, 0(11), p.1333 - 1334, 1996/06



Efficient enantiomeric enrichment of tartaric acid using a highly intense circularly polarized light

清水 雄一; 河西 俊一

Chemical Communications, 0(7), p.819 - 820, 1996/04


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