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Journal Articles

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

Uemura, Takuya*; Kita, Akiko*; Watanabe, Yoshihiko*; Adachi, Motoyasu; Kuroki, Ryota; Morimoto, Yukio*

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

 Times Cited Count:11 Percentile:44.32(Biochemistry & Molecular Biology)

Journal Articles

Synergic effects of ion irradiations (La, Ce) and alkaline pretreatment (KOH) on hydriding kinetic property of a Mm-Ni based alloy

Abe, Hiroshi; Aone, Shigeo*; Morimoto, Ryo*; Uchida, Hirohisa*

Journal of Alloys and Compounds, 580(Suppl.1), p.S219 - S221, 2013/12

 Times Cited Count:5 Percentile:62.11(Chemistry, Physical)

no abstracts in English

Journal Articles

Structure and function of $$Delta$$1-tetrahydrocannabinolic acid (THCA) synthase, the enzyme controlling the psychoactivity of ${it Cannabis sativa}$

Shoyama, Yoshinari*; Tamada, Taro; Kurihara, Kazuo; Takeuchi, Ayako*; Taura, Futoshi*; Arai, Shigeki; Blaber, M.*; Shoyama, Yukihiro*; Morimoto, Satoshi*; Kuroki, Ryota

Journal of Molecular Biology, 423(1), p.96 - 105, 2012/10

 Times Cited Count:55 Percentile:13.53(Biochemistry & Molecular Biology)

$$Delta$$1-tetrahydrocannabinolic acid (THCA) synthase catalyzes the oxidative cyclization of cannabigerolic acid (CBGA) into THCA, the precursor of the primary psychoactive agent $$Delta$$1-tetrahydrocannabinol in ${it Cannabis sativa}$. The structure-function relationship of THCA synthase was investigated by X-ray structure determination (2.75 ${AA}$ resolution) and mutational analysis. Specific amino acid residues were identified in the active site of THCA synthase that are involved in the oxidative cyclization of the CBGA substrate.

Journal Articles

Improvement of hydrogen absorption characteristics of Pd using irradiation of heavey ions

Abe, Hiroshi; Aone, Shigeo*; Morimoto, Ryo*; Uchida, Hirohisa*; Oshima, Takeshi

Transactions of the Materials Research Society of Japan, 36(1), p.133 - 135, 2011/03

The introduction of vacancies in Pd was found to be effective for an increase in the initial hydrogen absorption rate in a previous study. Also, it was reported that the initial hydrogen absorption rate depends strongly on the surface conditions of metals. Heavy ions with keV ranges can create severe damage and high densities of vacancy near the surface of materials. As well known, the formation of hydride phases can be facilitated by the presence of vacancy because vacancy acts as hydrogen trapping site to form hydrides. Thus, the hydrogen absorption characteristics of Pd may be improved by the irradiation of heavy ions. As a result, the initial hydrogen absorption rate increased due to ion irradiation, and the value became 3$$sim$$10 times higher than un-irradiated Pd.

Journal Articles

Ion-irradiation effects of hydrogen absorption in palladium metal

Yoneda, Yasuhiro; Tamura, Kazuhisa; Abe, Hiroshi; Oshima, Takeshi; Morimoto, Ryo*; Uchida, Hirohisa*; Mizuki, Junichiro

Transactions of the Materials Research Society of Japan, 33(4), p.1053 - 1056, 2008/12

The effect of ion irradiation on palladium (Pd) metal was investigated by hydrogen-absorption measurements, SEM microscopy and synchrotron X-ray diffraction. N$$^+$$ irradiation was made with an acceleration energy 350 keV. The initial hydrogen absorption rate of the irradiated Pd was three times larger than that of non-irradiated Pd. The microscopic structure was investigated by using the pair-distribution function (PDF) obtained by X-ray diffraction. Although the average structure of the Pd was f.c.c, the Pd atoms displaced and two occupancy sites are revealed. This site occupancy is closely related with the hydrogen-absorption rate.

Journal Articles

Crystallization and preliminary X-ray diffraction studies of polyketide synthase-1 (PKS-1) from ${it Cannabis sativa}$

Taguchi, Chiho; Taura, Futoshi*; Tamada, Taro; Shoyama, Yoshinari; Shoyama, Yukihiro*; Tanaka, Hiroyuki*; Kuroki, Ryota; Morimoto, Satoshi*

Acta Crystallographica Section F, 64(3), p.217 - 220, 2008/03

 Times Cited Count:3 Percentile:62.07(Biochemical Research Methods)

Journal Articles

Protonation states of buried histidine residues in human deoxyhemoglobin revealed by neutron crystallography

Chatake, Toshiyuki*; Shibayama, Naoya*; Park, S. Y.*; Kurihara, Kazuo; Tamada, Taro; Tanaka, Ichiro*; Niimura, Nobuo*; Kuroki, Ryota; Morimoto, Yukio*

Journal of the American Chemical Society, 129(48), p.14840 - 14841, 2007/12

 Times Cited Count:22 Percentile:40.27(Chemistry, Multidisciplinary)

Journal Articles

Effects of ion irradiation on hydriding rate of Mm based hydrogen storage alloy

Abe, Hiroshi; Morimoto, Ryo*; Sato, Fumiatsu*; Azuma, Yorito*; Uchida, Hirohisa*

Journal of Alloys and Compounds, 408-412, p.348 - 350, 2006/02

 Times Cited Count:10 Percentile:42.24(Chemistry, Physical)

Mm(misch metal) based hydrogen storage alloys are applied to the negative electrode of the Ni-H battery and other hydrogen storage systems. In such pratical applications, various surface processes of hydrogen molecules often become rate contolling. Therefore, the improvement of the alloy surface is of great importance to promote the initial activation and hydriding rate. We have reported that the alkaline pretreatment of an alloy surfece exhibits a high durability against CO attack. Since low energy ion irradiation is quite useful for surface modification of materials, the hydriding proerties of a Mm is expected on electrochemical hydriding rate of the alloy. As a result, the ion irradiation Mm was found to induce a higher hydriding rate than that of the un-irradiation one.

Journal Articles

Effects of surface modification by ion irradiation on the electrochemical hydrogen absorption rate of Pd

Abe, Hiroshi; Morimoto, Ryo*; Sato, Fumiatsu*; Azuma, Yorito*; Uchida, Hirohisa*

Journal of Alloys and Compounds, 404-406, p.288 - 292, 2005/12

 Times Cited Count:7 Percentile:46.02(Chemistry, Physical)

The effect of ion irradiation on the rate of electrochemical hydriding rate of palladium (Pd) was investigated. In this study, ion irradiation onto the Pd surface was made with H$$^{+}$$, He$$^{+}$$, Ar$$^{+}$$ and N$$^{+}$$ in the acceleration energy range from 30 to 350 keV, and in the ion dose up to 1 $$times$$ 10$$^{17}$$ cm$$^{-2}$$. As the ion dose was increased, the initial rate of hydriding of Pd was increased. The ion irradiatiion treatment of the surface of a metal induces high concentrations of vacancy. The increased hydriding rate may be caused by the induction of high concentration of vacancy whichi traps hydrogen atoms, and this seems to accelerate the rates of hydride nucleation and growth in the surface. The ion irradiation was found as an effective way to enhance the rate of the initial activation of Pd in the electrochemical hydriding process.

Oral presentation

Effects of nitrogen ion irradiation on the electrochemical hydrogen absorption rate of Pd

Wakabayashi, Go*; Morimoto, Ryo*; Uchida, Hirohisa*; Abe, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Effects of surface modification in hydrogen absorption material Pd using ion irradiation

Abe, Hiroshi; Uchida, Hirohisa*; Morimoto, Ryo*; Ito, Hisayoshi

no journal, , 

no abstracts in English

Oral presentation

Study of hydrogen storage characteristics and structual changes of hydrogen materials by ion irradiation

Abe, Hiroshi; Uchida, Hirohisa*; Morimoto, Ryo*; Yoneda, Yasuhiro; Mizuki, Junichiro; Ito, Hisayoshi

no journal, , 

no abstracts in English

Oral presentation

Influence of ion irradiation on the electrochemical hydrogenation characteristic of Pd

Aone, Shigeo*; Morimoto, Ryo*; Abe, Hiroshi; Uchida, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Crystal structure of delta1-tetrahydrocannabinolic acid (THCA) synthase from cannabis sativa

Shoyama, Yoshinari; Tamada, Taro; Takeuchi, Ayako*; Taura, Futoshi*; Adachi, Motoyasu; Shoyama, Yukihiro*; Kuroki, Ryota; Morimoto, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Expression and purification of polyketide synthase from cannabis sativa

Taguchi, Chiho*; Taura, Futoshi*; Morimoto, Satoshi*; Shoyama, Yoshinari; Tamada, Taro; Kuroki, Ryota; Shoyama, Yukihiro*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of electrochemical hydrogen abofsorption of Pd by ion irradiation

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Crystal structure of Delta1-tetrahydrocannabinolic acid synthase from ${it Cannabis sativa}$

Shoyama, Yoshinari; Tamada, Taro; Takeuchi, Ayako*; Taura, Futoshi*; Shoyama, Yukihiro*; Kuroki, Ryota; Morimoto, Satoshi*

no journal, , 

Oral presentation

Crystallization of proteinase K in deuterated solution for neutron analysis

Chatake, Toshiyuki*; Kurihara, Kazuo; Kuroki, Ryota; Morimoto, Yukio*

no journal, , 

Oral presentation

Effects of surface modification and hydrogen characteristics of Pd using an ion irradiation

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Effect of surface modifications of Pd by ion irradiation on the characteristics of hydrogen absorption

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

In previous studies, the induction of vacancy in palladium (Pd) was found to be effective for an increase in the initial hydrogen absorption rate. As well known, the initial hydrogen absorption rate depends strongly on the surface conditions of metals. Based on these results, we made surface modifications of Pd using various ions at TIARA, JAEA. In this study, we perform Cr ion irradiation into Pd, and the hydrogen absorption rate of ion irradiation Pd was evaluated. The Pd irradiated at a fluence to 1$$times$$10$$^{17}$$ cm$$^{-2}$$ exhibited the highest rate in all samples, and the hydrogen absorption rate became five times higher than that of un-irradiated Pd. Since vacancy type defects which might act as hydrogen trapping site are introduced by irradiation the enhancement of the hydrogen absorption rate obtained inthi study can be interpreted in terms of an increase of hydrogen trapping saites near the surface region due to irradiation of Cr ion into Pd.

26 (Records 1-20 displayed on this page)