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Tsurumi, Miwa*; Enoto, Teruaki*; Ikkatai, Yuko*; Wu, T.*; Wang, D.*; Shinoda, Taro*; Nakazawa, Kazuhiro*; Tsuji, Naoki*; Diniz, G.*; Kataoka, Jun*; et al.
Geophysical Research Letters, 50(13), p.e2023GL103612_1 - e2023GL103612_9, 2023/07
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:15 Percentile:50.83(Biochemistry & Molecular Biology)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:31.92(Chemistry, Physical)no abstracts in English
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:79 Percentile:89.33(Biochemistry & Molecular Biology)1-tetrahydrocannabinolic acid (THCA) synthase catalyzes the oxidative cyclization of cannabigerolic acid (CBGA) into THCA, the precursor of the primary psychoactive agent 1-tetrahydrocannabinol in . The structure-function relationship of THCA synthase was investigated by X-ray structure determination (2.75 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.
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 310 times higher than un-irradiated Pd.
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.
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:36.12(Biochemical Research Methods)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:25 Percentile:60.32(Chemistry, Multidisciplinary)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:54.75(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.
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:51.72(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 10 cm. 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.
Wakabayashi, Go*; Morimoto, Ryo*; Uchida, Hirohisa*; Abe, Hiroshi
no journal, ,
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Abe, Hiroshi; Uchida, Hirohisa*; Morimoto, Ryo*; Ito, Hisayoshi
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Abe, Hiroshi; Uchida, Hirohisa*; Morimoto, Ryo*; Yoneda, Yasuhiro; Mizuki, Junichiro; Ito, Hisayoshi
no journal, ,
no abstracts in English
Aone, Shigeo*; Morimoto, Ryo*; Abe, Hiroshi; Uchida, Hirohisa*
no journal, ,
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Shoyama, Yoshinari; Tamada, Taro; Takeuchi, Ayako*; Taura, Futoshi*; Adachi, Motoyasu; Shoyama, Yukihiro*; Kuroki, Ryota; Morimoto, Satoshi*
no journal, ,
no abstracts in English
Taguchi, Chiho*; Taura, Futoshi*; Morimoto, Satoshi*; Shoyama, Yoshinari; Tamada, Taro; Kuroki, Ryota; Shoyama, Yukihiro*
no journal, ,
no abstracts in English
Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi
no journal, ,
no abstracts in English
Shoyama, Yoshinari; Tamada, Taro; Takeuchi, Ayako*; Taura, Futoshi*; Shoyama, Yukihiro*; Kuroki, Ryota; Morimoto, Satoshi*
no journal, ,
Chatake, Toshiyuki*; Kurihara, Kazuo; Kuroki, Ryota; Morimoto, Yukio*
no journal, ,
Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi
no journal, ,
no abstracts in English