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Journal Articles

Noninvasive imaging of hollow structures and gas movement revealed the gas partial-pressure-gradient-driven long-distance gas movement in the aerenchyma along the leaf blade to submerged organs in rice

Yin, Y.-G.*; Mori, Yoshinao*; Suzui, Nobuo*; Kurita, Keisuke; Yamaguchi, Mitsutaka*; Miyoshi, Yuta*; Nagao, Yuto*; Ashikari, Motoyuki*; Nagai, Keisuke*; Kawachi, Naoki*

New Phytologist, 232(5), p.1974 - 1984, 2021/12

 Times Cited Count:7 Percentile:66.39(Plant Sciences)

Rice ($$Oryza sativa$$) plants have porous or hollow organs consisting of aerenchyma, which is presumed to function as a low-resistance diffusion pathway for air to travel from the foliage above the water to submerged organs. However, gas movement in rice plants has yet to be visualized in real time. In this study involving partially submerged rice plants, the leaves emerging from the water were fed nitrogen-13-labeled nitrogen ([$$^{13}$$N]N$$_2$$) tracer gas, and the gas movement downward along the leaf blade, leaf sheath, and internode over time was monitored.

Journal Articles

Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Kurihara, Momo*; Yasutaka, Tetsuo*; Aono, Tatsuo*; Ashikawa, Nobuo*; Ebina, Hiroyuki*; Iijima, Takeshi*; Ishimaru, Kei*; Kanai, Ramon*; Karube, Jinichi*; Konnai, Yae*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 322(2), p.477 - 485, 2019/11

 Times Cited Count:2 Percentile:23.14(Chemistry, Analytical)

We assessed the repeatability and reproducibility of methods for determining low dissolved radiocesium concentrations in freshwater in Fukushima. Twenty-one laboratories pre-concentrated three of 10 L samples by five different pre-concentration methods (prussian-blue-impregnated filter cartridges, coprecipitation with ammonium phosphomolybdate, evaporation, solid-phase extraction disks, and ion-exchange resin columns), and activity of radiocesium was measured. The z-scores for all of the $$^{137}$$Cs results were within $$pm$$2, indicating that the methods were accurate. The relative standard deviations (RSDs) indicating the variability in the results from different laboratories were larger than the RSDs indicating the variability in the results from each separate laboratory.

JAEA Reports

Current status of a decommissioning project in the Enrichment Engineering Facility; Results in the second-half of the fiscal year of 2014

Matsumoto, Takashi; Takahashi, Nobuo; Hayashibara, Kenichi; Ishimori, Yuu; Mita, Yutaka; Kakiya, Hideyoshi

JAEA-Technology 2016-020, 80 Pages, 2016/11


The Enrichment Engineering Facility of the Ningyo-toge Environmental Engineering Center was constructed in order to establish the technological basis of plant engineering for uranium enrichment in Japan. Uranium enrichment tests, using natural and reprocessed uranium, were carried out from 1979 to 1989 with two types of centrifuges in the facility. According to the decommissioning plan of the facility, UF$$_{6}$$ handling equipment and supplemental equipment in these plants are intended to be dismantled by 2019 in order to make vacant spaces for future projects use, for example, inventory investigation, precipitation treatment, etc. This report shows the current state of the decommissioning project in the second-half of the fiscal year of 2014.

JAEA Reports

Decommissioning activities and R&D of nuclear facilities in the second midterm plan

Terunuma, Akihiro; Mimura, Ryuji; Nagashima, Hisao; Aoyagi, Yoshitaka; Hirokawa, Katsunori*; Uta, Masato; Ishimori, Yuu; Kuwabara, Jun; Okamoto, Hisato; Kimura, Yasuhisa; et al.

JAEA-Review 2016-008, 98 Pages, 2016/07


Japan Atomic Energy Agency formulated the plan to achieve the medium-term target in the period of April 2010 to March 2015(hereinafter referred to as "the second medium-term plan"). JAEA determined the plan for the business operations of each year (hereinafter referred to as "the year plan"). This report is that the Sector of Decommissioning and Radioactive Waste Management has summarized the results of the decommissioning technology development and decommissioning of nuclear facilities which were carried out in the second medium-term plan.

JAEA Reports

Current status of a decommissioning project in the Enrichment Engineering Facilities; Results in the first-half of the fiscal year of 2014

Matsumoto, Takashi; Morimoto, Yasuyuki; Takahashi, Nobuo; Takata, Masaharu; Yoshida, Hideaki; Nakashima, Shinichi; Ishimori, Yuu

JAEA-Technology 2015-036, 60 Pages, 2016/01


The Enrichment Engineering Facilities of the Ningyo-toge Environmental Engineering Center was constructed in order to establish the technical basis of the uranium enrichment plant in Japan. Uranium enrichment tests, using natural and reprocessed uranium, were carried out from 1979 to 1990 at two types of plants in the facilities. UF$$_{6}$$ handling equipment and Supplemental equipment in these plants are intended to be dismantled by 2019 in order to make places for future projects, for example, inventory investigation, precipitation treatment, etc. This report shows the basic plan of this decommissioning project and presents the current state of dismantling in the first-half of the fiscal year of 2014, with indicating its schedule, procedure, situation, results, and so on. The dismantled materials generated amounted to 37 mesh containers and 199 drums, and the secondary waste generated amounted to 271.4 kg.

Journal Articles

Crystal structures of the catalytic domain of a novel glycohydrolase family 23 chitinase from ${it Ralstonia}$ sp. A-471 reveals a unique arrangement of the catalytic residues for inverting chitin hydrolysis

Arimori, 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:28 Percentile:63.94(Biochemistry & Molecular Biology)

Chitinase C from ${it Ralstonia}$ 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.

Journal Articles

Crystallization and preliminary X-ray diffraction studies of the catalytic domain of a novel chitinase, a member of GH family 23, from the moderately thermophilic bacterium ${it Ralstonia}$ sp. A-471

Okazaki, 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:41.7(Biochemical Research Methods)

Journal Articles

Partial crystallization of silicon by high intensity laser irradiation

Azuma, Hirozumi*; Sagisaka, Akito; Daido, Hiroyuki; Ito, Isao*; Kadoura, Hiroaki*; Kamiya, Nobuo*; Ito, Tadashi*; Nishimura, Akihiko; Ma, J.*; Mori, Michiaki; et al.

Applied Surface Science, 255(24), p.9783 - 9786, 2009/09

 Times Cited Count:2 Percentile:11.89(Chemistry, Physical)

Commercial single crystal silicon wafers and amorphous silicon films piled on single crystal silicon wafers were irradiated with a femtosecond pulsed laser and a nanosecond pulsed laser at irradiation intensities between 10$$^{17}$$ W/cm$$^{2}$$ and 10$$^{9}$$ W/cm$$^{2}$$. In the single crystal silicon substrate, the irradiated area was changed to polycrystalline silicon and the piled silicon around the irradiated area has spindly column structures constructed of polycrystalline and amorphous silicon. In particular, in the case of the higher irradiation intensity of 10$$^{16}$$ W/cm$$^{2}$$, the irradiated area was oriented to the same crystal direction as the substrate. In the case of the lower irradiation intensity of 10$$^{8}$$ W/cm$$^{2}$$, only amorphous silicon was observed around the irradiated area, even when the target was single crystal silicon.

Journal Articles

Structure of HIV-1 protease in complex with potent inhibitor KNI-272 determined by high-resolution X-ray and neutron crystallography

Adachi, Motoyasu; Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Honjo, Eijiro; Okazaki, Nobuo; Arai, Shigeki; Shoyama, Yoshinari; Kimura, Kaname*; Matsumura, Hiroyoshi*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 106(12), p.4641 - 4646, 2009/03

 Times Cited Count:111 Percentile:91.05(Multidisciplinary Sciences)

To further understand the catalytic mechanism and inhibitor recognition of HIV-1 protease, we need to determine the locations of key hydrogen atoms in the catalytic aspartates Asp25 and Asp125. The structure of HIV-1 protease in complex with transition-state analog KNI-272 was determined by combined neutron crystallography at 1.9 ${AA}$ resolution and X-ray crystallography at 1.4 ${AA}$ resolution. The resulting structural data shows that the catalytic residue Asp25 is protonated and that Asp125 is deprotonated. The proton on Asp25 makes a hydrogen bond with the carbonyl group of the allophenylnorstatine group in KNI-272. The deprotonated Asp125 bonds to the hydroxyl proton of Apns. The results provide direct experimental evidence for proposed aspects of the catalytic mechanism of HIV-1 protease; and can therefore contribute substantially to the development of specific inhibitors for therapeutic application.

Journal Articles

Positron related analysis of $$^{13}$$N-nitrate in transgenic rice plant over-expressing nitrate transporter

Sato, Daisuke*; Mori, Mari*; Katayama, Hisato*; Kitamura, Harushige*; Kawai, Toshihiko*; Fujimaki, Shu; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Matsuhashi, Shimpei; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 128, 2007/02

no abstracts in English

Journal Articles

Generation of nanometer-sized silicon tadpoles irradiated with a high intensity laser pulse

Sagisaka, Akito; Azuma, Hirozumi*; Daido, Hiroyuki; Kamiya, Nobuo*; Ito, Tadashi*; Takeuchi, Akihiro*; Suzuki, Noritomo*; Nishimura, Akihiko; Mori, Michiaki; Orimo, Satoshi; et al.

Proceedings of 4th International Congress on Laser Advanced Materials Processing (LAMP 2006) (Internet), 3 Pages, 2006/00

no abstracts in English

Journal Articles

Effects of ultrastrong gravitational field on the crystalline state of a Bi-Sb alloy

Huang, X.*; Mashimo, Tsutomu; Ono, Masao; Tomita, Takeshi; Sawai, Tomotsugu; Osakabe, Toyotaka; Mori, Nobuo*

Journal of Applied Physics, 96(3), p.1336 - 1340, 2004/08

 Times Cited Count:11 Percentile:42.95(Physics, Applied)

Mega-gravity field experiments were performed on the Bi$$_{70}$$Sb$$_{30}$$(atomic percent) alloy and pure Bi below their melting points, to investigate the change in crystalline state. For the alloy centrifuged at 191-205 $$^{circ}$$C, no change in composition was observed, and the grain sizes of the crystals decreased from several mm to tens of $$mu$$m, while no distinct change in grain size was observed for the centrifuged pure Bi. The alloy centrifuged at 220-240 $$^{circ}$$C consisted of two regions with different morphologies-fine-grained crystals with grain sizes around tens of $$mu$$m in the low gravity region, and large crystals with grain sizes several mm long and hundreds of $$mu$$m wide along the direction of gravity in the high gravity region, where sedimentation of atoms was confirmed. The large crystals with hexagonal structures were formed by preferential crystal growth roughly along the c axes, and a large strain that increased as the gravitational field increased existed inside these crystals. Formation of this anomalous crystal state might be correlated with the sedimentation of atoms.

Journal Articles

Advanced high-temperature ultracentrifuge apparatus for mega-gravity materials science

Mashimo, Tsutomu; Huang, X.; Osakabe, Toyotaka; Ono, Masao*; Nishihara, Masamichi*; Ihara, Hirotaka*; Sueyoshi, Masanori*; Shibasaki, Koji*; Shibasaki, Shiro*; Mori, Nobuo*

Review of Scientific Instruments, 74(1), p.160 - 163, 2003/01

 Times Cited Count:53 Percentile:89.16(Instruments & Instrumentation)

An ultracentrifuge apparatus, which could generate an ultra-strong gravitational field of even $$>$$1,000,000 (1 million) G (1G = 9.8 m/s$$^{2}$$) in a wide temperature range up to $$>$$ 500$$^{circ}$$C with high stability controls, was developed for new materials science research. The system consisted of an air turbine motor with ceramic ball bearings and dumper section, a sample rotor with an outer diameter up to 160 mm, a vacuum chamber and a heating system. The ultracentrifuge experiments using the 70 and 80 mm-diam rotors made of titanium alloy with rotational speeds of up to 170,000 rpm at temperatures of even over 200$$^{circ}$$C for 100 hours with the ripples of $$<$$ 0.05% and $$<$$ 1 degree, respectively, were successfully performed, where the maximum gravitational field at sample was $$>$$1,000,000 G, and the potential energy and sample volume were larger than those of the Kumamoto University one (Rev. Sci. Instr. 67, 3170 (1996)) by $$>$$ 1.9 and $$>$$ 4 times, respectively.

Journal Articles

Pressure effect on antiferromagnetic ordering in UIn$$_3$$

Haga, Yoshinori; Honda, Fuminori*; Eto, Tetsujiro*; Omi, Gendo*; Kagayama, Tomoko*; Takeshita, Nao*; Mori, Nobuo*; Nakanishi, Takeshi*; Tokiwa, Yoshifumi*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 71(8), p.2019 - 2021, 2002/08

 Times Cited Count:9 Percentile:52.77(Physics, Multidisciplinary)

Pressure phase diagram of the antiferromagnet UIn3 was constructed from the electrical resistivity measurement under high pressures up to 9 GPa. Neel temperature increases monotonically with increasing pressure from 88 K at ambient pressure to 127 K at 9 GPa. We observed an additional resistive anomaly at 21 K under 1.4 GPa. This anomaly brings about an increase of the residual resistivity. The transition temperature decreases gradually with increasing pressure and disappears around 8 GPa.

Journal Articles

Novel magnetic structure of the low carrier system CeP and CeAs under external fields

Osakabe, Toyotaka; *; Iwasa, Kazuaki*; Kakurai, Kazuhisa*; J.-M.Mignot*; I.Goncharenko*; *; Takahashi, Hiroki*; Mori, Nobuo*; Kubota, M.*; et al.

Physics of Strongly Correlated Electron Systems (JJAP Series 11), p.123 - 125, 1998/00

no abstracts in English

Journal Articles

Superconducting RF activities at JAERI

Takeuchi, Suehiro; Matsuda, Makoto; Minehara, Eisuke; Sugimoto, Masayoshi; Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Ouchi, Nobuo; Kusano, Joichi; et al.

Proc. of 8th Workshop on RF Superconductivity, 1, p.233 - 236, 1998/00

no abstracts in English

JAEA Reports

Application of difference filter to Feynman-$$alpha$$ analysis

Mori, Tomoaki; Otani, Nobuo

PNC TN9410 97-095, 44 Pages, 1997/11


The Feynman-$$alpha$$ method has been developed for monitoring sub-criticality in nuclear fuel facilities. It is difficult to apply the Feynman-$$alpha$$ method which estimates statistical variation of the number of neutron counts per unit time, to the system in transient condition such that the averaged neutron flux varies with time. In the application of Feynman-$$alpha$$ method to such system, it is suggested to remove the averaged variation of neutron flux from neutron count data by the use of the difference filter. In this study, we applied the difference filter to reactor noise data at sub-criticality near to criticality, where the prompt decay constant was difficult to estimate due to the large effect of delayed neutron. With the difference filter, accurate prompt decay constants for effective multiplication factors from 0.999 to 0.994 were obtained by Feynman-$$alpha$$ method. It was cleared that the difference filter is effective to estimate accurate prompt decay constant, so that there is the prospect to be able to apply Feynman-$$alpha$$ method having the difference filter to the system in the transient condition.

Journal Articles

Novel magnetic structures of the low-carrier system CeP under high pressure

Osakabe, Toyotaka; Kogi, M.*; Iwasa, Kazuaki*; *; J.M.Mignot*; I.N.Goncharenko*; *; *; Mori, Nobuo*; Haga, Yoshinori; et al.

Physica B; Condensed Matter, 230-232, p.645 - 648, 1997/00

 Times Cited Count:17 Percentile:69.74(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Phase transitions and superconductivity of Sr-substituted La$$_{2-x}$$Ba$$_{x}$$CuO$$_{4}$$(x=0.125)

Katano, Susumu; Ueda, Yutaka*; *; Mori, Nobuo*

Physica B; Condensed Matter, 213-214, p.81 - 83, 1995/00

 Times Cited Count:2 Percentile:18.72(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Effect of pressure on T$$_{c}$$ in La$$_{2-x}$$Ba$$_{x}$$CuO$$_{4}$$ with x=0.125

Mori, Nobuo*; *; *; *; Ueda, Yutaka*; *; Katano, Susumu

J. Supercond., 7(5), p.819 - 821, 1994/10

no abstracts in English

38 (Records 1-20 displayed on this page)