Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ishii, Yui*; Yamamoto, Arisa*; Sato, Naoki*; Nambu, Yusuke*; Kawamura, Seiko; Murai, Naoki; Ohara, Koji*; Kawaguchi, Shogo*; Mori, Takao*; Mori, Shigeo*
Physical Review B, 106(13), p.134111_1 - 134111_7, 2022/10
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)
P studied by soft X-ray photoemission spectroscopyKawasaki, Ikuto; Kobata, Masaaki; Fujimori, Shinichi; Takeda, Yukiharu; Yamagami, Hiroshi; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Physical Review B, 104(16), p.165124_1 - 165124_8, 2021/10
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)
studied by soft X-ray angle-resolved photoemission spectroscopyKawasaki, Ikuto; Kobata, Masaaki; Fujimori, Shinichi; Takeda, Yukiharu; Yamagami, Hiroshi; Nakamura, Ai*; Iha, Wataru*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Journal of the Physical Society of Japan, 89(4), p.044704_1 - 044704_6, 2020/04
Times Cited Count：3 Percentile：31.18(Physics, Multidisciplinary)Ge and EuCuSi studied by soft X-ray photoemission spectroscopyKawasaki, Ikuto; Fujimori, Shinichi; Takeda, Yukiharu; Yamagami, Hiroshi; Iha, Wataru*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Physical Review B, 100(3), p.035111_1 - 035111_8, 2019/07
Times Cited Count：8 Percentile：41.92(Materials Science, Multidisciplinary)Mori, Airi; Ishizaki, Azusa; Futemma, Akira; Tanabe, Tsutomu; Wada, Takao; Kato, Mitsugu; Munakata, Masahiro
Hoken Butsuri (Internet), 54(1), p.45 - 54, 2019/04
VFeAsO
studied by X-ray magnetic circular dichroismHorio, Masafumi*; Takeda, Yukiharu; Namiki, Hiromasa*; Katagiri, Takao*; Wakabayashi, Yuki*; Sakamoto, Shoya*; Nonaka, Yosuke*; Shibata, Goro*; Ikeda, Keisuke*; Saito, Yuji; et al.
Journal of the Physical Society of Japan, 87(10), p.105001_1 - 105001_2, 2018/10
Times Cited Count：2 Percentile：21.2(Physics, Multidisciplinary)Ge in the normal stateNakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; et al.
Physical Review B, 97(11), p.115160_1 - 115160_7, 2018/03
Times Cited Count：5 Percentile：20.71(Materials Science, Multidisciplinary)Mori, Airi; Tanabe, Tsutomu; Wada, Takao; Kato, Mitsugu
JAEA-Technology 2017-006, 38 Pages, 2017/03
JAEA-Technology-2017-006.pdf:2.98MB
Large quantities of radioactive materials were released into the environment as a result of the Fukushima Daiichi Nuclear Power Station accident. Residential areas and forest areas near the power station were contaminated with the radioactive materials. Outside of the houses, schools and the other buildings are being decontaminated by national authority and local government. On the other hand, the materials (such as walls, floors, or windows) which constitute the houses are not decontaminated officially. In order to prepare decontamination methods that can be applied easily, we conducted examinations of decontamination for various materials in houses. Fibrous materials, woods, glasses, concretes, plastics, vinyl chloride materials, metals and synthetic leathers were used in our examinations. These materials were collected from houses in difficult-to-return zone, and were contaminated by radioactive materials released by the accident. Dry methods (suction, wiping, adsorption and peelable coating), wet methods (wiping, brushing, polishing and washing) and physical method (peeling of materials) were used for decontamination. As a result of our examinations, materials with low water permeability, such as glasses, concretes, vinyl chloride materials and metals, were able to be decontaminated efficiently (about 90% reduction) by using wet methods. Materials with high water permeability like woods were relatively well decontaminated by peelable coating (about 60%-70% reduction). In addition to the examination described above, the difference of contamination reduction effect between chemical properties of detergents and the effect of rubbing of peelable coating were also examined. Finally, the most effective method was summarized based on these examinations.
GeNakatani, Yasuhiro*; Fujiwara, Hidenori*; Aratani, Hidekazu*; Mori, Takeo*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; Yamagami, Hiroshi*; et al.
Journal of Electron Spectroscopy and Related Phenomena, 220, p.50 - 53, 2017/01
Times Cited Count：2 Percentile：17.1(Spectroscopy)We report the soft X-ray angle-resolved photoemission study for LaNiGe to reveal the electronic structures derived from non-4
bands of the heavy fermion compound CeNiGe. The photoemission spectra recorded at the La M
absorption edges clearly show the enhancement of the La 5
components in the valence band spectra. The circular dichroism of photoemission spectra reveals the band-dependent dichroic response due to the orbital symmetry.
; Soft X-ray absorption, magnetic circular dichroism, and angle-resolved photoemission spectroscopiesSaito, Yuji; Fujiwara, Hidenori*; Yamaguchi, Takashi*; Nakatani, Yasuhiro*; Mori, Takeo*; Fuchimoto, Hiroto*; Kiss, Takayuki*; Yasui, Akira*; Miyawaki, Jun*; Imada, Shin*; et al.
Journal of the Physical Society of Japan, 85(11), p.114713_1 - 114713_7, 2016/11
Times Cited Count：15 Percentile：68.09(Physics, Multidisciplinary)We report on the electronic structures of ferromagnetic CeAgSb using soft X-ray absorption (XAS), magnetic circular dichroism (XMCD), and angle-resolved photoemission (ARPES) spectroscopies. The Ce 
XAS spectra show very small satellite structures, reflecting a strongly localized character of the Ce 4
electrons. The linear dichroism effects in the Ce XAS spectra demonstrate the ground-state Ce 4 symmetry of 
, the spatial distribution of which is directed along the 
-axis. Nevertheless, ARPES spectra at the Ce 3-4 resonance show the momentum dependence of the intensity ratio between Ce 4
and 4
peaks in a part of the Brillouin zone, suggesting the non negligible momentum-dependent hybridization effect between the Ce 4 and the conduction electrons. This is associated with the moderate mass enhancement in CeAgSb.
studied by photoelectron spectroscopyKobata, Masaaki; Fujimori, Shinichi; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Kobayashi, Keisuke*; Yamagami, Hiroshi; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; et al.
Journal of the Physical Society of Japan, 85(9), p.094703_1 - 094703_6, 2016/09
Times Cited Count：13 Percentile：62.55(Physics, Multidisciplinary)-orbital symmetry of the ground state in Yb compounds by linear dichroism in core-level photoemissionMori, Takeo*; Kitayama, Satoshi*; Kanai, Yuina*; Naimen, Sho*; Fujiwara, Hidenori*; Higashiya, Atsushi*; Tamasaku, Kenji*; Tanaka, Arata*; Terashima, Kensei*; Imada, Shin*; et al.
Journal of the Physical Society of Japan, 83(12), p.123702_1 - 123702_5, 2014/12
Times Cited Count：16 Percentile：68.53(Physics, Multidisciplinary)We show that the strongly correlated 4-orbital symmetry of the ground state is revealed by linear dichroism in core-level photoemission spectra, as we have discovered for YbRhSi and YbCuSi. Theoretical analysis shows us that the linear dichroism reflects the anisotropic charge distributions resulting from a crystalline electric field. We have successfully determined the ground-state 4 symmetry for both compounds from the polarization-dependent angle resolved core-level spectra at a temperature well below the first excitation energy. The excited-state symmetry is also probed by temperature dependence of the linear dichroism where the high measurement temperatures are on the order of the crystal-field-splitting energies.
and EuAlNakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Miura, Yasunao*; Tsutsumi, Hiroki*; Mori, Akinobu*; Ishida, Kazuhiro*; Mitamura, Katsuya*; Hirose, Yusuke*; et al.
JPS Conference Proceedings (Internet), 3, p.011012_1 - 011012_6, 2014/06
Nakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Tatetsu, Yasutomi*; Maehira, Takahiro*; Miura, Yasunao*; Mori, Akinobu*; Tsutsumi, Hiroki*; Hirose, Yusuke*; et al.
Journal of the Physical Society of Japan, 82(12), p.124708_1 - 124708_6, 2013/12
Times Cited Count：21 Percentile：72.6(Physics, Multidisciplinary)
-glucanase from 
Arimori, Takao*; Ito, Akihiro*; Nakazawa, Masami*; Ueda, Mitsuhiro*; Tamada, Taro
Journal of Synchrotron Radiation, 20(6), p.884 - 889, 2013/11
Times Cited Count：17 Percentile：65.54(Instruments & Instrumentation)The saccharification process is essential for bioethanol production from woody biomass including celluloses. Cold-adapted cellulase, which has sufficient activity at low temperature (
293 K), is capable of reducing heating costs during the saccharification process and is suitable for simultaneous saccharification and fermentation. Endo-1,4--glucanase from the earthworm Eisenia fetida (EF-EG2) belonging to glycoside hydrolase family 9 has been shown to have the highest activity at 313 K, and also retained a comparatively high activity at 283 K. The recombinant EF-EG2 was purified expressed in Pichia pastoris, and then grew needle-shaped crystals with dimensions of 0.02 
0.02 1 mm. The crystals belonged to the space group P3221 with unit-cell parameters of 
= 
=136 
, 
= 55.0 ,. The final model of EF-EG2, including 435 residues, two ions, seven crystallization reagents and 696 waters, was refined to a crystallographic 
-factor of 14.7% (free -factor of 16.8%) to 1.5 , resolution. The overall structure of EF-EG2 has an (
/) barrel fold which contains a putative active-site cleft and a negatively charged surface. This structural information helps us understand the catalytic and cold adaptation mechanisms of EF-EG2.
Nakamura, Ai*; Hiranaka, Yuichi*; Hedo, Masato*; Nakama, Takao*; Miura, Yasunao*; Tsutsumi, Hiroki*; Mori, Akinobu*; Ishida, Kazuhiro*; Mitamura, Katsuya*; Hirose, Yusuke*; et al.
Journal of the Physical Society of Japan, 82(10), p.104703_1 - 104703_10, 2013/10
Times Cited Count：35 Percentile：81.11(Physics, Multidisciplinary)
sp. A-471 reveals a unique arrangement of the catalytic residues for inverting chitin hydrolysisArimori, Takao*; Kawamoto, Noriko*; Shinya, Shoko*; Okazaki, Nobuo*; Nakazawa, Masami*; Miyatake, Kazutaka*; Fukamizo, Tamo*; Ueda, Mitsuhiro*; Tamada, Taro
Journal of Biological Chemistry, 288(26), p.18696 - 18706, 2013/07
Times Cited Count：30 Percentile：64.37(Biochemistry & Molecular Biology)Chitinase C from sp. A-471 (Ra-ChiC) has a catalytic domain sequence similar to goose type (G-type) lysozymes and, unlike other chitinases, belongs to glycohydrolase (GH) family 23. Using NMR spectroscopy, however, Ra-ChiC was found to interact only with the chitin dimer but not with the peptideglycan fragment. Here we report the crystal structures of wild-type, E141Q, and E162Q of the catalytic domain of Ra-ChiC with or without chitin oligosaccharides. Ra-ChiC has a substrate-binding site including a tunnel-shaped cavity, which determines the substrate specificity. Mutation analyses based on this structural information indicated that a highly conserved Glu141 acts as a catalytic acid, and that Asp226 located at the roof of the tunnel activates a water molecule as a catalytic base. The unique arrangement of the catalytic residues makes a clear contrast to the other GH23 members and also to inverting GH19 chitinases.
Arimori, Takao; Yamagata, Yuriko*
Fukuoka Igaku Zasshi, 102(11), p.303 - 312, 2011/11
Human NUDT5 hydrolyzes 8-oxo-dGDP into 8-oxo-dGMP and inorganic phosphate and prevents mutations caused by misincorporation of 8-oxoG into DNA. In addition, NUDT5 displays a broad substrate specificity for various modified nucleotides including 8-oxo-dADP, 8-oxo-GDP, and ADP-ribose. To understand the mechanisms of substrate recognition and catalysis by NUDT5, we have determined the crystal structure of NUDT5 complexed with 8-oxo-dGDP. A comparison of the structure with the previously reported NUDT5-ADP-ribose complex structure illustrated extremely different binding modes of these substrates. Especially, unexpectedly, the positions of two phosphates of substrate ( and phosphates) in the 8-oxo-dGDP complex are completely inverted compared to those in the ADP-ribose complex, which indicates that either the catalytic residues or the nucleophilic substitution sites of substrates are different between hydrolysis reactions of these substrates. To further investigate the catalytic mechanisms, we next determined the site of nucleophilic substitution of water for 8-oxo-dGDP and ADP-ribose by the 
P NMR spectra of the reaction products in 
O-labeled water. The results clearly showed that the sites were different between these substrates, that is, 8-oxo-dGDP was attacked by a nucleophilic water at the P, whereas ADP-ribose was at the P. Thus, we revealed the unique catalytic mechanism of NUDT5 as well as the multiple substrate recognition mechanism by structural and NMR analyses.
Arimori, Takao; Tamaoki, Haruhiko*; Nakamura, Teruya*; Kamiya, Hiroyuki*; Ikemizu, Shinji*; Takagi, Yasumitsu*; Ishibashi, Toru*; Harashima, Hideyoshi*; Sekiguchi, Mutsuo*; Yamagata, Yuriko*
Nucleic Acids Research, 39(20), p.8972 - 8983, 2011/11
Times Cited Count：24 Percentile：52.33(Biochemistry & Molecular Biology) sp. A-471Okazaki, Nobuo; Arimori, Takao; Nakazawa, Masami*; Miyatake, Kazutaka*; Ueda, Mitsuhiro*; Tamada, Taro
Acta Crystallographica Section F, 67(4), p.494 - 497, 2011/04
Times Cited Count：3 Percentile：41.34(Biochemical Research Methods)