1
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Niwase T, Watanabe YX, Hirayama Y, Mukai M, Schury P, Andreyev AN, Hashimoto T, Iimura S, Ishiyama H, Ito Y, Jeong SC, Kaji D, Kimura S, Miyatake H, Morimoto K, Moon JY, Oyaizu M, Rosenbusch M, Taniguchi A, Wada M. Discovery of New Isotope ^{241}U and Systematic High-Precision Atomic Mass Measurements of Neutron-Rich Pa-Pu Nuclei Produced via Multinucleon Transfer Reactions. Phys Rev Lett 2023; 130:132502. [PMID: 37067317 DOI: 10.1103/physrevlett.130.132502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/26/2023] [Accepted: 02/16/2023] [Indexed: 06/19/2023]
Abstract
The new isotope ^{241}U was synthesized and systematic atomic mass measurements of nineteen neutron-rich Pa-Pu isotopes were performed in the multinucleon transfer reactions of the ^{238}U+^{198}Pt system at the KISS facility. The present experimental results demonstrate the crucial role of the multinucleon transfer reactions for accessing unexplored neutron-rich actinide isotopes toward the N=152 shell gap in this region of nuclides.
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Affiliation(s)
- T Niwase
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - Y X Watanabe
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - Y Hirayama
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - M Mukai
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - P Schury
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - A N Andreyev
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - T Hashimoto
- Institute for Basic Science, 70, Yuseong-daero 1689-gil, Yusung-gu, Daejeon 43000, Korea
| | - S Iimura
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
| | - H Ishiyama
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - Y Ito
- Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
| | - S C Jeong
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - D Kaji
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - S Kimura
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - H Miyatake
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - K Morimoto
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - J-Y Moon
- Institute for Basic Science, 70, Yuseong-daero 1689-gil, Yusung-gu, Daejeon 43000, Korea
| | - M Oyaizu
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - M Rosenbusch
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - A Taniguchi
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - M Wada
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
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2
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Iimura S, Rosenbusch M, Takamine A, Tsunoda Y, Wada M, Chen S, Hou DS, Xian W, Ishiyama H, Yan S, Schury P, Crawford H, Doornenbal P, Hirayama Y, Ito Y, Kimura S, Koiwai T, Kojima TM, Koura H, Lee J, Liu J, Michimasa S, Miyatake H, Moon JY, Naimi S, Nishimura S, Niwase T, Odahara A, Otsuka T, Paschalis S, Petri M, Shimizu N, Sonoda T, Suzuki D, Watanabe YX, Wimmer K, Wollnik H. Study of the N=32 and N=34 Shell Gap for Ti and V by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI. Phys Rev Lett 2023; 130:012501. [PMID: 36669221 DOI: 10.1103/physrevlett.130.012501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/22/2022] [Indexed: 06/17/2023]
Abstract
The atomic masses of ^{55}Sc, ^{56,58}Ti, and ^{56-59}V have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and delivered to the novel designed gas cell and multireflection system, which has been recently commissioned downstream of the ZeroDegree spectrometer following the BigRIPS separator. For ^{56,58}Ti and ^{56-59}V, the mass uncertainties have been reduced down to the order of 10 keV, shedding new light on the N=34 shell effect in Ti and V isotopes by the first high-precision mass measurements of the critical species ^{58}Ti and ^{59}V. With the new precision achieved, we reveal the nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap above the occupied νp_{3/2} orbit is identified as a feature unique to Ca. We perform new Monte Carlo shell model calculations including the νd_{5/2} and νg_{9/2} orbits and compare the results with conventional shell model calculations, which exclude the νg_{9/2} and the νd_{5/2} orbits. The comparison indicates that the shell gap reduction in Ti is related to a partial occupation of the higher orbitals for the outer two valence neutrons at N=34.
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Affiliation(s)
- S Iimura
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
- Department of Physics, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- Department of Physics, College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Tokyo 171-8501, Japan
| | - M Rosenbusch
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - A Takamine
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - Y Tsunoda
- Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
| | - M Wada
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - S Chen
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - D S Hou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - W Xian
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - H Ishiyama
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - S Yan
- Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou 510632, China
| | - P Schury
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - H Crawford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94523, USA
| | - P Doornenbal
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - Y Hirayama
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - Y Ito
- Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
| | - S Kimura
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - T Koiwai
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T M Kojima
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - H Koura
- Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
| | - J Lee
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - J Liu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Michimasa
- Center of Nuclear Study (CNS), The University of Tokyo, Bunkyo 113-0033, Japan
| | - H Miyatake
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - J Y Moon
- Institute for Basic Science, 70, Yuseong-daero 1689-gil, Yusung-gu, Daejeon 305-811, Korea
| | - S Naimi
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - S Nishimura
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - T Niwase
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - A Odahara
- Department of Physics, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - T Otsuka
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
- Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Paschalis
- School of Physics, Engineering, and Technology, University of York, York YO10 5DD, United Kingdom
| | - M Petri
- School of Physics, Engineering, and Technology, University of York, York YO10 5DD, United Kingdom
| | - N Shimizu
- Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
| | - T Sonoda
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - D Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
| | - Y X Watanabe
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - K Wimmer
- RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - H Wollnik
- New Mexico State University, Las Cruces, New Mexico 88001, USA
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3
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Hirayama Y, Biwa T, Delage R. Periodic acoustic pulse generation by mode locked thermoacoustic oscillator. J Acoust Soc Am 2021; 150:2310. [PMID: 34717483 DOI: 10.1121/10.0006536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 09/11/2021] [Indexed: 06/13/2023]
Abstract
This study documents periodic acoustic pulse generation by heat in a thermoacoustic oscillator system constructed from a gas-filled acoustic resonance tube having a porous medium called a stack. When the system's dissonancy was enhanced by a local cross-sectional area change in the resonance tube, the periodic pulsed state was turned to a quasiperiodic state. This observation suggests that the acoustic pulse was created through the mode-locking of internal oscillation modes. Propagation of pulsed acoustic intensity in the resonance tube was evidenced by simultaneous measurements of acoustic pressure and axial acoustic particle velocity of the gas.
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Affiliation(s)
- Y Hirayama
- Department of Mechanical Systems Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - T Biwa
- Department of Mechanical Systems Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - R Delage
- Department of Management Science and Technology, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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Takahashi N, Yoshida H, Kimura H, Kamiyama K, Kurose T, Sugimoto H, Imura T, Yokoi S, Kasuno K, Kurosawa H, Hirayama Y, Naiki H, Hara M, Iwano M. POS-397 Severe diabetic glomerulosclerosis by chronic hypoxic housing of db/db mice; the role of mesangiolysis and podocyte injury with ultrastructural abnormalities. Kidney Int Rep 2021. [DOI: 10.1016/j.ekir.2021.03.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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5
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Walker PM, Hirayama Y, Lane GJ, Watanabe H, Dracoulis GD, Ahmed M, Brunet M, Hashimoto T, Ishizawa S, Kondev FG, Litvinov YA, Miyatake H, Moon JY, Mukai M, Niwase T, Park JH, Podolyák Z, Rosenbusch M, Schury P, Wada M, Watanabe XY, Liang WY, Xu FR. Properties of ^{187}Ta Revealed through Isomeric Decay. Phys Rev Lett 2020; 125:192505. [PMID: 33216598 DOI: 10.1103/physrevlett.125.192505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
Mass-separated ^{187}Ta_{114} in a high-spin isomeric state has been produced for the first time by multinucleon transfer reactions, employing an argon gas-stopping cell and laser ionization. Internal γ rays revealed a T_{1/2}=7.3±0.9 s isomer at 1778±1 keV, which decays through a rotational band with perturbations associated with the approach to a prolate-oblate shape transition. Model calculations show less influence from triaxiality compared to heavier elements in the same mass region. The isomer-decay reduced E2 hindrance factor f_{ν}=27±1 supports the interpretation that axial symmetry is approximately conserved.
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Affiliation(s)
- P M Walker
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - Y Hirayama
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - G J Lane
- Department of Nuclear Physics, RSPhys, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - H Watanabe
- School of Physics, and International Research Center for Nuclei and Particles in Cosmos, Beihang University, Beijing 100191, China
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
| | - G D Dracoulis
- Department of Nuclear Physics, RSPhys, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - M Ahmed
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - M Brunet
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - T Hashimoto
- Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, Republic of Korea
| | - S Ishizawa
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
- Graduate School of Science and Engineering, Yamagata University, Yamagata 992-8510, Japan
| | - F G Kondev
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - H Miyatake
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - J Y Moon
- Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, Republic of Korea
| | - M Mukai
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - T Niwase
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - J H Park
- Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, Republic of Korea
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - M Rosenbusch
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - P Schury
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - M Wada
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - X Y Watanabe
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan
| | - W Y Liang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - F R Xu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
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Hirayama Y, Mukai M, Watanabe YX, Oyaizu M, Jeong SC, Kakiguchi Y, Schury P, Wada M, Miyatake H. Efficient two-color two-step laser ionization schemes of λ 1∼ 250 nm and λ 2 = 307.9 nm for heavy refractory elements-Measurements of ionization cross-sections and hyperfine spectra of tantalum and tungsten. Rev Sci Instrum 2019; 90:115104. [PMID: 31779376 DOI: 10.1063/1.5124444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
We demonstrated efficient two-color two-step laser ionization schemes in the combined use of λ1 ∼ 250 nm and λ2 = 307.9 nm, which are applicable to heavy refractory elements with an atomic number in the wide range of Z = 69-78. We investigated newly observed ionization schemes of tantalum and tungsten atoms in an argon-gas-cell-based laser ion source for the efficient ionization of atoms of unstable nuclei through the two-color two-step laser resonance ionization technique. We experimentally determined the ionization cross sections from the measured saturation curves by solving the rate equations for the ground, intermediate, and ionization continuum populations. Hyperfine structures of these elements were also studied to deduce the isotope-shift, pressure-shift, and pressure-broadening in the resonance spectra of the excitation transitions in the argon gas cell. The electronic factor F255 of the excitation transition λ1 = 255.2115 nm between the ground and intermediate states was deduced from the measured isotope shifts of stable 182,183,184,186W isotopes. The ionization schemes investigated here are applicable to extract any isotopes of these elements by considering the measured pressure shift and nuclear isotope shift in optimizing the wavelength λ1.
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Affiliation(s)
- Y Hirayama
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - M Mukai
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-0006, Japan
| | - Y X Watanabe
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - M Oyaizu
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - S C Jeong
- Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, South Korea
| | - Y Kakiguchi
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - P Schury
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - M Wada
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
| | - H Miyatake
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
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7
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Kuroda M, Kawata M, Matsuura A, Adachi K, Hirayama Y, Matsuura T, Matsumoto A, Kodaira M, Kintsu M, Suzuki Y. P6441New continuous glucose monitoring reveals hypoglycemia risk in both diabetic and nondiabetic patients with acute myocardial infarction. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.1035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
There has been growing evidence that the glucose fluctuation is an important contributing factor to the development of coronary artery disease. However, whether large glucose fluctuation, especially hypoglycemia, may be associated with acute myocardial infarction (AMI) remains largely unknown.
Aim
As new continuous glucose monitoring (CGM) has recently become available to evaluate glucose fluctuation from immediately after an emergency visit, this study sought to investigate glucose fluctuation and the occurrence of hypoglycemia in patients with AMI.
Methods
In this prospective study, 93 consecutive patients with AMI from April 2017 to November 2018 were enrolled. Subcutaneous interstitial glucose levels were monitored from emergency room to discharge using the CGM System. Based on the CGM data, 24-h mean glucose levels, the time in hyperglycemia and hypoglycemia and the occurrence of hypoglycemia, defined as less than 70 mg/dL, were measured, and the mean amplitude of glycemic excursions (MAGE) were calculated.
Results
The majority of patients [n=57, 61% (non-DM)] did not have diabetes and 36 patients had diabetes (DM). The occurrence of hypoglycemia within 24 hours after admission was observed in 49 patients [DM: n=11 (30.6%), non-DM: n=38 (66.7%)]. MAGE within 24 hours after admission were 100±47 in DM patients and 67±20 in non-DM patients. The mean time in hypoglycemia within 24 hours after admission was 148 minutes [DM: 100±260 minutes, non-DM: 178±287 minutes]. The occurrence of hypoglycemia during a hospital stay (mean 11.5 days) was detected in 76 patients [DM: n=28 (77.8%), non-DM: n=48 (84.2%)].
Representative case of hypoglycemia
Conclusion
Not only in DM patients but also in non-DM patients with AMI, large glucose fluctuation and high incidence of hypoglycemia were observed using new CGM system. Further investigations should address the rationale for the early detection and control of glucose fluctuation for AMI patients.
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Affiliation(s)
- M Kuroda
- Akashi Medical Center, Akashi, Japan
| | - M Kawata
- Akashi Medical Center, Akashi, Japan
| | | | - K Adachi
- Akashi Medical Center, Akashi, Japan
| | | | | | | | - M Kodaira
- Akashi Medical Center, Akashi, Japan
| | - M Kintsu
- Akashi Medical Center, Akashi, Japan
| | - Y Suzuki
- Akashi Medical Center, Akashi, Japan
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8
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Arai K, Sakamoto T, Yamane K, Hirayama Y, Teruya Y, Yanai M, Kinoshita N, Yamaguchi K, Makino H, Kodani M, Igishi T, Yamasaki A. P2.14-44 Tumor Mutation Burden and Efficacy of Molecular Targeted Therapy in Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Shigematsu A, Ota S, Kobayashi R, Kondo T, Endo T, Tsutsumi Y, Kobayashi H, Kakinoki Y, Yamamoto S, Konuma Y, Miyagishima T, Igarashi T, Oda T, Sakai H, Ishihara T, Yoshida M, Nagashima T, Sato K, Kanisawa Y, Haseyama T, Hirayama Y, Kurosawa M. PF184 EFFICACY OF CONSOLIDATION CHEMOTHERAPY FOR PATIENTS WITH ACUTE LYMPHOBLASTIC LEUKEMIA WHO ACHIEVED COMPLETE REMISSION BY FIRST COURSE OF REMISSION INDUCTION THERAPY. Hemasphere 2019. [DOI: 10.1097/01.hs9.0000558952.18518.ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kitagori K, Yoshifuji H, Oku T, Ayaki T, Kuzuya A, Nakajima T, Akizuki S, Nakashima R, Murakami K, Ohmura K, Hirayama Y, Takahashi R, Mimori T. Utility of osteopontin in cerebrospinal fluid as a diagnostic marker for neuropsychiatric systemic lupus erythematosus. Lupus 2019; 28:414-422. [DOI: 10.1177/0961203319828818] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The whole protein of osteopontin (OPN full) and its cleaved form (OPN N-half) are involved in the immune response and the migration of immune cells to an inflammatory lesion. We have reported that serum OPN full and urine OPN N-half are elevated in lupus nephritis (LN). Neuropsychiatric systemic lupus erythematosus (NPSLE) is a refractory complication of SLE. To investigate whether OPN full and OPN N-half could serve as diagnostic markers for NPSLE, and to elucidate their role in NPSLE pathogenesis, the concentrations of OPN full and OPN N-half in cerebrospinal fluid (CSF) were measured in NPSLE and non-NPSLE patients. We found that the concentration of OPN full in the CSF was significantly higher in NPSLE than in non-NPSLE, and it decreased after treatment. When the cutoff value of OPN full in CSF was set to 963.4 ng/ml, the sensitivity and specificity for the diagnosis of NPSLE were 70% and 100%, respectively. The correlation analysis of OPN full, OPN N-half and various cytokines/chemokines suggested that the cytokines/chemokines could be divided into two clusters: cluster A, which contains OPN full and cluster B, which contains interleukin-6. OPN full in CSF could be a novel diagnostic marker for NPSLE.
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Affiliation(s)
- K Kitagori
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - H Yoshifuji
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Oku
- Center for Innovation in Immunoregulative Technology and Therapeutics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Candidate Discovery Science Labs, Astellas Pharma Inc, Ibaraki, Japan
| | - T Ayaki
- Department of Neurology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - A Kuzuya
- Department of Neurology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Nakajima
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - S Akizuki
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - R Nakashima
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Murakami
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - K Ohmura
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Y Hirayama
- Center for Innovation in Immunoregulative Technology and Therapeutics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Candidate Discovery Science Labs, Astellas Pharma Inc, Ibaraki, Japan
| | - R Takahashi
- Department of Neurology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - T Mimori
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Hisajima T, Waki H, Suzuki T, Miura T, Takanari J, Hirayama Y, Imai K, Uebaba K. Effect of Portulaca Oleracea yeast extract on healthy volunteers in clinical trial. Clin Nutr 2018. [DOI: 10.1016/j.clnu.2018.06.2032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ito Y, Schury P, Wada M, Arai F, Haba H, Hirayama Y, Ishizawa S, Kaji D, Kimura S, Koura H, MacCormick M, Miyatake H, Moon JY, Morimoto K, Morita K, Mukai M, Murray I, Niwase T, Okada K, Ozawa A, Rosenbusch M, Takamine A, Tanaka T, Watanabe YX, Wollnik H, Yamaki S. First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph. Phys Rev Lett 2018; 120:152501. [PMID: 29756864 DOI: 10.1103/physrevlett.120.152501] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 02/05/2018] [Indexed: 06/08/2023]
Abstract
The masses of ^{246}Es, ^{251}Fm, and the transfermium nuclei ^{249-252}Md and ^{254}No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed N=152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. The masses of ^{246}Es and ^{249,250,252}Md were measured for the first time. Using the masses of ^{249,250}Md as anchor points for α decay chains, the masses of heavier nuclei, up to ^{261}Bh and ^{266}Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ_{2n} derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N=152 neutron shell closure for Md and Lr.
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Affiliation(s)
- Y Ito
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - P Schury
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
| | - M Wada
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
| | - F Arai
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H Haba
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - Y Hirayama
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
| | - S Ishizawa
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Graduate School of Science and Engineering, Yamagata University, Yamagata 990-8560, Japan
| | - D Kaji
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - S Kimura
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - H Koura
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1185, Japan
| | - M MacCormick
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - H Miyatake
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
| | - J Y Moon
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
- Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, Korea
| | - K Morimoto
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - K Morita
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Department of Physics, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - M Mukai
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
- University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - I Murray
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - T Niwase
- Department of Physics, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - K Okada
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan
| | - A Ozawa
- University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M Rosenbusch
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - A Takamine
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
| | - T Tanaka
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Department of Physics, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - Y X Watanabe
- Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako 351-0198, Japan
| | - H Wollnik
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA
| | - S Yamaki
- RIKEN Nishina Center for Accelerator-Based Science, Wako 351-0198, Japan
- Department of Physics, Saitama University, Sakura-ku, Saitama 338-8570, Japan
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Strano E, Mazzocco M, Boiano A, Boiano C, La Commara M, Manea C, Parascandolo C, Pierroutsakou D, Signorini C, Torresi D, Yamaguchi H, Kahl D, Acosta L, Di Meo P, Fernandez-Garcia J, Glodariu T, Grebosz J, Guglielmetti A, Imai N, Hirayama Y, Ishiyama H, Iwasa N, Jeong S, Jia H, Keeley N, Kim Y, Kimura S, Kubono S, Lay J, Lin C, Marquinez-Duran G, Marte I, Miyatake H, Mukai M, Nakao T, Nicoletto M, Pakou A, Rusek K, Sakaguchi Y, Sanchez-Benitez A, Sava T, Sgouros O, Stefanini C, Soramel F, Soukeras V, Stiliaris E, Stroe L, Teranishi T, Toniolo N, Wakabayashi Y, Watanabe Y, Yang L, Yang Y. 7Be and 8B reaction dynamics at Coulomb barrier energies. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201818402015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We investigated the reaction dynamics induced by the 7Be,8B+208Pb collisions at energies around the Coulomb barrier. Charged particles originated by both the col- lisions were detected by means of 6 ΔE-Eres telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the 6,7Li+208Pb colli-sion data. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.
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Ikuma D, Hiromura K, Kajiyama H, Suwa J, Ikeuchi H, Sakairi T, Kaneko Y, Maeshima A, Kurosawa H, Hirayama Y, Yokota K, Araki Y, Sato K, Asanuma YF, Akiyama Y, Hara M, Nojima Y, Mimura T. The correlation of urinary podocytes and podocalyxin with histological features of lupus nephritis. Lupus 2017; 27:484-493. [PMID: 29050536 DOI: 10.1177/0961203317734918] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Objectives The objective of this study was to test the correlation of urinary podocyte number (U-Pod) and urinary podocalyxin levels (U-PCX) with histology of lupus nephritis. Methods This was an observational, cross-sectional study. Sixty-four patients were enrolled: 40 with lupus nephritis and 24 without lupus nephritis (12 lupus nephritis patients in complete remission and 12 systemic lupus erythematosus patients without lupus nephritis). Urine samples were collected before initiating treatment. U-Pod was determined by counting podocalyxin-positive cells, and U-PCX was measured by sandwich ELISA, normalized to urinary creatinine levels (U-Pod/Cr, U-PCX/Cr). Results Lupus nephritis patients showed significantly higher U-Pod/Cr and U-PCX/Cr compared with patients without lupus nephritis. U-Pod/Cr was high in proliferative lupus nephritis (class III±V/IV±V), especially in pure class IV (4.57 (2.02-16.75)), but low in pure class V (0.30 (0.00-0.71)). U-Pod/Cr showed a positive correlation with activity index ( r=0.50, P=0.0012) and was independently associated with cellular crescent formation. In contrast, U-PCX/Cr was high in both proliferative and membranous lupus nephritis. Receiver operating characteristic analysis revealed significant correlation of U-Pod/Cr with pure class IV, class IV±V and cellular crescent formation, and the combined values of U-Pod/Cr and U-PCX/Cr were shown to be associated with pure class V. Conclusions U-Pod/Cr and U-PCX/Cr correlate with histological features of lupus nephritis.
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Affiliation(s)
- D Ikuma
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - K Hiromura
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Kajiyama
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - J Suwa
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Ikeuchi
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - T Sakairi
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - Y Kaneko
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - A Maeshima
- 2 Department of Medicine and Clinical Science, Gunma University Graduate School of Medicine, Gunma, Japan
| | - H Kurosawa
- 3 Diagnostics Research Department, Denka Innovation Center, Tokyo, Japan
| | - Y Hirayama
- 3 Diagnostics Research Department, Denka Innovation Center, Tokyo, Japan
| | - K Yokota
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y Araki
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - K Sato
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y F Asanuma
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
| | - Y Akiyama
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan.,4 Department of Rheumatology, Japanese Red Cross Ogawa Hospital, Saitama, Japan
| | - M Hara
- 5 Department of Pediatrics, Yoshida Hospital, Niigata, Japan
| | - Y Nojima
- 6 Department of Nephrology, Japanese Red Cross Maebashi Hospital, Gunma, Japan
| | - T Mimura
- 1 Department of Rheumatology and Applied Immunology, Saitama Medical University, Saitama, Japan
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Yamamoto N, Matsuzawa Y, Komoriya Y, Hirayama Y, Asai T, Takahashi T, Takahashi T. Self-Generated Toroidal Flow in a High-Beta Compact Toroid with Mirror Configuration. Fusion Science and Technology 2017. [DOI: 10.13182/fst09-a6988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- N. Yamamoto
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Y. Matsuzawa
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Y. Komoriya
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Y. Hirayama
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - T. Asai
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Ts. Takahashi
- 1College of Science and Technology, Nihon University, 1-8-14 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan
| | - To. Takahashi
- 2Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515
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Matsuura T, Adachi K, Kodaira M, Hirayama Y, Matsumoto A, Kato Y, Kawata M, Matsuura A, Kamemura K, Kuroda M, Sogabe K, Takigami M, Kintsu M, Sakamoto S. P5471Cardiac resynchronization therapy in patients with narrow QRS complex: impact of left axis deviation to predict outcomes and survival. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kato Y, Kuroda M, Sogabe K, Kawata M, Matsuura A, Adachi K, Hirayama Y, Kamemura K, Matsuura T, Matsumoto A, Takigami M, Kodaira M, Kintsu M, Sakamoto S. P2348Long-term vessel healing response to first-generation versus second-generation drug-eluting stents in acute coronary syndrome assessed by optical coherence tomography. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kodaira M, Matsuura T, Adachi K, Hirayama Y, Matsumoto A, Kato Y, Kawata M, Matsuura A, Kamemura K, Kuroda M, Sogabe K, Takigami M, Kintsu M. P5478QRS axis and benefit of cardiac resynchronization therapy in heart failure patients with non-Left bundle branch block, from long term follow up. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Sogabe K, Kuroda M, Takigami M, Kawata M, Matsuura A, Adachi K, Hirayama Y, Kamemura K, Matsuura T, Matsumoto A, Kato Y, Kodaira M, Kintsu M, Sakamoto S. P2340Impact of optical coherence tomography findings during percutaneous coronary intervention on 2-year clinical outcomes: comparison between stable angina pectoris and acute coronary syndrome. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Srinivasan A, Miserev DS, Hudson KL, Klochan O, Muraki K, Hirayama Y, Reuter D, Wieck AD, Sushkov OP, Hamilton AR. Detection and Control of Spin-Orbit Interactions in a GaAs Hole Quantum Point Contact. Phys Rev Lett 2017; 118:146801. [PMID: 28430471 DOI: 10.1103/physrevlett.118.146801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Indexed: 06/07/2023]
Abstract
We investigate the relationship between the Zeeman interaction and the inversion-asymmetry-induced spin-orbit interactions (Rashba and Dresselhaus SOIs) in GaAs hole quantum point contacts. The presence of a strong SOI results in the crossing and anticrossing of adjacent spin-split hole subbands in a magnetic field. We demonstrate theoretically and experimentally that the anticrossing energy gap depends on the interplay between the SOI terms and the highly anisotropic hole g tensor and that this interplay can be tuned by selecting the crystal axis along which the current and magnetic field are aligned. Our results constitute the independent detection and control of the Dresselhaus and Rashba SOIs in hole systems, which could be of importance for spintronics and quantum information applications.
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Affiliation(s)
- A Srinivasan
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
| | - D S Miserev
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
| | - K L Hudson
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
| | - O Klochan
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
| | - K Muraki
- NTT Basic Research Laboratories, NTT corporation, Atsugi-shi, Kanagawa 243-0198, Japan
| | - Y Hirayama
- Graduate School of Science, Tohoku University, Sendai-shi, Miyagi 980-8578, Japan
| | - D Reuter
- Fachbereich Physik, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
| | - A D Wieck
- Angewandte Festkorperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - O P Sushkov
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
| | - A R Hamilton
- School of Physics, University of New South Wales, Sydney New South Wales 2052, Australia
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Asano S, Hirayama Y, Matsushita Y. Distribution of Tomato spotted wilt virus in dahlia plants. Lett Appl Microbiol 2017; 64:297-303. [PMID: 28129432 DOI: 10.1111/lam.12720] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 01/05/2017] [Accepted: 01/10/2017] [Indexed: 11/29/2022]
Abstract
Tomato spotted wilt virus (TSWV) causes significant losses in the production of the ornamental plant Dahlia variabilis in Japan. The purpose of this study was to examine the distribution of TSWV in dahlia plants and identify plant parts that can be used in the selection of TSWV-free plants. The distribution of TSWV was investigated using reverse transcriptional polymerase chain reaction (RT-PCR) and tissue blot immunoassay. The detection rate of TSWV in latent infected compound leaves was the highest in the petiole, and it decreased from the veins and rachis to the lamina. The tissue blot immunoassays of the leaflets showed an uneven distribution of TSWV, especially along the edge of the leaf blade. In stems, the detection rate of TSWV was high partway up the stem compared to that in the upper and the lower parts of the stem during the vegetative growth stage. A highly uneven distribution was observed in the bulb. Our results indicated that middle parts of the stem as well as the petioles, rachis, and veins of compound leaves are suitable for detection of TSWV in dahlias. This study is the first to report uneven distribution of TSWV in dahlia plants. SIGNIFICANCE AND IMPACT OF THE STUDY In this study, the distribution of Tomato spotted wilt virus (TSWV) in various parts of dahlia plants was investigated for the first time. The distribution of TSWV was uneven in compound leaves, leaflets, stems, and bulbs. The middle parts of the stem or the petiole and leaf veins should be sampled to detect TSWV when selecting healthy plants.
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Affiliation(s)
- S Asano
- Nara Prefecture Agricultural Research and Development Center, Sakurai, Japan
| | - Y Hirayama
- Nara Prefecture Agricultural Research and Development Center, Sakurai, Japan
| | - Y Matsushita
- Institute of Vegetable and Floriculture Science, NARO, Tsukuba, Japan
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Commara ML, Mazzocco M, Boiano A, Boiano C, Manea C, Parascandolo C, Pierroutsakou D, Signorini C, Strano E, Torresi D, Yamaguchi H, Kahl D, Meo PD, Grebosz J, Imai N, Hirayama Y, Ishiyama H, Iwasa N, Jeong S, Jia H, Kim Y, Kimura S, Kubono S, Lin C, Miyatake H, Mukai M, Nakao T, Nicoletto M, Sakaguchi Y, Sánchez-Benítez A, Soramel F, Teranishi T, Wakabayashi Y, Watanabe Y, Yang L, Yang Y. 8B + 208Pb Elastic Scattering at Coulomb Barrier Energies. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201716300032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mazzocco M, Boiano A, Boiano C, La Commara M, Manea C, Parascandolo C, Pierroutsakou D, Signorini C, Strano E, Torresi D, Yamaguchi H, Kahl D, Acosta L, Di Meo P, Fernandez-Garcia J, Glodariu T, Grebosz J, Guglielmetti A, Imai N, Hirayama Y, Ishiyama H, Iwasa N, Jeong S, Jia H, Keeley N, Kim Y, Kimura S, Kubono S, Lay J, Lin C, Marquinez-Duran G, Martel I, Miyatake H, Mukai M, Nakao T, Nicoletto M, Pakou A, Rusek K, Sakaguchi Y, Sánchez-Benítez A, Sava T, Sgouros O, Stefanini C, Soramel F, Soukeras V, Stiliaris E, Stroe L, Teranishi T, Toniolo N, Wakabayashi Y, Watanabe Y, Yang L, Yang Y. 7Be- and8B-reaction dynamics at Coulomb barrier energies. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611706006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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24
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Miyamoto S, Miura T, Watanabe S, Nagase K, Hirayama Y. Localized NMR Mediated by Electrical-Field-Induced Domain Wall Oscillation in Quantum-Hall-Ferromagnet Nanowire. Nano Lett 2016; 16:1596-1601. [PMID: 26885703 DOI: 10.1021/acs.nanolett.5b04209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present fractional quantum Hall domain walls confined in a gate-defined wire structure. Our experiments utilize spatial oscillation of domain walls driven by radio frequency electric fields to cause nuclear magnetic resonance. The resulting spectra are discussed in terms of both large quadrupole fields created around the wire and hyperfine fields associated with the oscillating domain walls. This provides the experimental fact that the domain walls survive near the confined geometry despite of potential deformation, by which a localized magnetic resonance is allowed in electrical means.
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Affiliation(s)
- S Miyamoto
- Department of Physics, Tohoku University , 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - T Miura
- Department of Physics, Tohoku University , 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - S Watanabe
- Institute of Science and Engineering, Kanazawa University , Kanazawa 920-1192, Japan
| | - K Nagase
- Department of Physics, Tohoku University , 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Y Hirayama
- Department of Physics, Tohoku University , 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
- WPI-AIMR, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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25
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Hirayama Y, Miyatake H, Watanabe Y, Imai N, Ishiyama H, Jeong S, Jung H, Oyaizu M, Mukai M, Kimura S, Sonoda T, Wada M, Kim Y, Huyse M, Kudryavtsev Y, Van Duppen P. Beta-decay spectroscopy of r-process nuclei around N= 126. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201610908001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Sakagami N, Nishida K, Misumi K, Hirayama Y, Yamashita S, Hoshi H, Misawa H, Akiyama K, Suzuki C, Yoshioka K. The relationship between oxygen consumption rate and viability of in vivo-derived pig embryos vitrified by the micro volume air cooling method. Anim Reprod Sci 2016; 164:40-6. [DOI: 10.1016/j.anireprosci.2015.11.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 10/30/2015] [Accepted: 11/02/2015] [Indexed: 11/26/2022]
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27
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Watanabe YX, Kim YH, Jeong SC, Hirayama Y, Imai N, Ishiyama H, Jung HS, Miyatake H, Choi S, Song JS, Clement E, de France G, Navin A, Rejmund M, Schmitt C, Pollarolo G, Corradi L, Fioretto E, Montanari D, Niikura M, Suzuki D, Nishibata H, Takatsu J. Pathway for the Production of Neutron-Rich Isotopes around the N=126 Shell Closure. Phys Rev Lett 2015; 115:172503. [PMID: 26551108 DOI: 10.1103/physrevlett.115.172503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Indexed: 06/05/2023]
Abstract
Absolute cross sections for isotopically identified products formed in multinucleon transfer in the (136)Xe+(198)Pt system at ∼8 MeV/nucleon are reported. The isotopic distributions obtained using a large acceptance spectrometer demonstrated the production of the "hard-to-reach" neutron-rich isotopes for Z<78 around the N=126 shell closure far from stability. The main contribution to the formation of these exotic nuclei is shown to arise in collisions with a small kinetic energy dissipation. The present experimental finding corroborates for the first time recent predictions that multinucleon transfer reactions would be the optimum method to populate and characterize neutron-rich isotopes around N=126 which are crucial for understanding both astrophysically relevant processes and the evolution of "magic" numbers far from stability.
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Affiliation(s)
- Y X Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y H Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
| | - S C Jeong
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y Hirayama
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - N Imai
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H Ishiyama
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H S Jung
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - H Miyatake
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - S Choi
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
| | - J S Song
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Institute for Nuclear and Particle Astrophysics, Seoul National University, Seoul 08826, Korea
- Institute for Basic Science, Daejeon 34047, Korea
| | - E Clement
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - A Navin
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - M Rejmund
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - C Schmitt
- Grand Accélérateur National d'Ions Lourds (GANIL), F-14076 Caen Cedex 5, France
| | - G Pollarolo
- Dipartimento di Fisica Teorica, Università di Torino, and Istituto Nazionale di Fisica Nucleare, I-10125 Torino, Italy
| | - L Corradi
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - E Fioretto
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - D Montanari
- Dipartimento di Fisica, Università di Padova, and Istituto Nazionale di Fisica Nucleare, I-35131 Padova, Italy
| | - M Niikura
- Institut de Physique Nucléaire (IPN), IN2P3-CNRS, F-91406 Orsay Cedex, France
| | - D Suzuki
- Institut de Physique Nucléaire (IPN), IN2P3-CNRS, F-91406 Orsay Cedex, France
| | - H Nishibata
- Department of Physics, Osaka University, Osaka 560-0043, Japan
| | - J Takatsu
- Department of Physics, Osaka University, Osaka 560-0043, Japan
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28
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Asano S, Matsushita Y, Hirayama Y, Naka T. Simultaneous detection of Tomato spotted wilt virus
,Dahlia mosaic virus
and Chrysanthemum stunt viroid
by multiplex RT-PCR in dahlias and their distribution in Japanese dahlias. Lett Appl Microbiol 2015; 61:113-20. [DOI: 10.1111/lam.12442] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/05/2015] [Accepted: 05/07/2015] [Indexed: 11/28/2022]
Affiliation(s)
- S. Asano
- Nara Prefectural Agricultural Research and Development Center; Kashihara Nara Japan
| | - Y. Matsushita
- NARO Institute of Floricultural Science; Tsukuba Ibaraki Japan
| | - Y. Hirayama
- Nara Prefectural Agricultural Research and Development Center; Kashihara Nara Japan
| | - T. Naka
- Nara Prefectural Agricultural Research and Development Center; Kashihara Nara Japan
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29
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Renard VT, Piot BA, Waintal X, Fleury G, Cooper D, Niida Y, Tregurtha D, Fujiwara A, Hirayama Y, Takashina K. Valley polarization assisted spin polarization in two dimensions. Nat Commun 2015; 6:7230. [PMID: 26027889 PMCID: PMC4458877 DOI: 10.1038/ncomms8230] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 04/20/2015] [Indexed: 11/15/2022] Open
Abstract
Valleytronics is rapidly emerging as an exciting area of basic and applied research. In two-dimensional systems, valley polarization can dramatically modify physical properties through electron-electron interactions as demonstrated by such phenomena as the fractional quantum Hall effect and the metal-insulator transition. Here, we address the electrons' spin alignment in a magnetic field in silicon-on-insulator quantum wells under valley polarization. In stark contrast to expectations from a non-interacting model, we show experimentally that less magnetic field can be required to fully spin polarize a valley-polarized system than a valley-degenerate one. Furthermore, we show that these observations are quantitatively described by parameter-free ab initio quantum Monte Carlo simulations. We interpret the results as a manifestation of the greater stability of the spin- and valley-degenerate system against ferromagnetic instability and Wigner crystalization, which in turn suggests the existence of a new strongly correlated electron liquid at low electron densities.
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Affiliation(s)
- V. T. Renard
- Université Grenoble Alpes/CEA, INAC-SPSMS, F-38000, Grenoble, France
| | - B. A. Piot
- Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA-EMFL, 38042, Grenoble, France
| | - X. Waintal
- Université Grenoble Alpes/CEA, INAC-SPSMS, F-38000, Grenoble, France
| | - G. Fleury
- Service de Physique de l'État Condensé, DSM/IRAMIS/SPEC, CNRS UMR 3680 CEA Saclay, 91191 Gif sur Yvette, France
| | - D. Cooper
- Université Grenoble Alpes/CEA Leti Minatec campus, F-38054, Grenoble, France
| | - Y. Niida
- Graduate School of Science, Tohoku University, 6-3 Aramakiaza Aoba, Aobaku, Sendai, 980-8578, Japan
| | - D. Tregurtha
- Department of Physics, University of Bath, Bath, BA2 7AY, UK
| | - A. Fujiwara
- NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa, 243-0198, Japan
| | - Y. Hirayama
- Graduate School of Science, Tohoku University, 6-3 Aramakiaza Aoba, Aobaku, Sendai, 980-8578, Japan
| | - K. Takashina
- Department of Physics, University of Bath, Bath, BA2 7AY, UK
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30
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Kim YH, Watanabe YX, Hirayama Y, Imai N, Ishiyama H, Jeong SC, Miyatake H, Choi S, Song J, Clement E, de France G, Navin A, Rejmund M, Schmitt C, Pollarolo G, Corradi L, Fioretto E, Montanari D, Niikura M, Suzuki D, Nishibata H, Takatsu J. Study of the multi-nucleon transfer reactions of136Xe +198Pt for producing exotic heavy nuclei. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Mukai M, Hirayama Y, Jeong SC, Imai N, Ishiyama H, Miyatake H, Oyaizu M, Watanabe YX, Kim YH. In-gas-cell laser ion source for KEK isotope separation system. Rev Sci Instrum 2014; 85:02B906. [PMID: 24593611 DOI: 10.1063/1.4827112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The KEK isotope separation system (KISS) is an element-selective isotope separator under development at RIKEN. The in-gas-cell laser ion source is a critical component of the KISS, a gas cell filled with argon gas of 50 kPa enclosed in a vacuum chamber. In the gas cell, nuclear reaction products are stopped (i.e., thermalized and neutralized) and transported by a laminar flow of argon to the ionization region just upstream of the gas outlet, and thereby an element of interest among those reaction products is selectively ionized by two-color resonant laser irradiation. Recently, we succeeded to extract laser-ionized Fe ions by injecting an energetic Fe beam into the gas cell. Recent off- and on-line test results were presented and discussed.
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Affiliation(s)
- M Mukai
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - Y Hirayama
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - S C Jeong
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - N Imai
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - H Ishiyama
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - H Miyatake
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - M Oyaizu
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - Y X Watanabe
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
| | - Y H Kim
- High Energy Accelerator Res Org. (KEK), Ibaraki 305-0801, Japan
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32
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Hirayama Y, Jeong S, Watanabe Y, Imai N, Ishiyama H, Miyatake H, Oyaizu M, Kim Y, Mukai M, Sonoda T, Wada M, Huyse M, Kudryavtsev Y, Van Duppen P. Present Status of KEK Isotope Separation System. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146611017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Uzu K, Adachi K, Suehiro H, Takada H, Matsuura T, Kamemura K, Hirayama Y, Matsuura A, Kawata M, Sakamoto S. Impact of the left ventricular lead position for long-term prognosis after cardiac resynchronization therapy in heart failure patients. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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34
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Renard VT, Duchemin I, Niida Y, Fujiwara A, Hirayama Y, Takashina K. Metallic behaviour in SOI quantum wells with strong intervalley scattering. Sci Rep 2013; 3:2011. [PMID: 23774638 PMCID: PMC3684805 DOI: 10.1038/srep02011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 05/31/2013] [Indexed: 11/09/2022] Open
Abstract
The fundamental properties of valleys are recently attracting growing attention due to electrons in new and topical materials possessing this degree-of-freedom and recent proposals for valleytronics devices. In silicon MOSFETs, the interest has a longer history since the valley degree of freedom had been identified as a key parameter in the observation of the controversial "metallic behaviour" in two dimensions. However, while it has been recently demonstrated that lifting valley degeneracy can destroy the metallic behaviour, little is known about the role of intervalley scattering. Here, we show that the metallic behaviour can be observed in the presence of strong intervalley scattering in silicon on insulator (SOI) quantum wells. Analysis of the conductivity in terms of quantum corrections reveals that interactions are much stronger in SOI than in conventional MOSFETs, leading to the metallic behaviour despite the strong intervalley scattering.
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Affiliation(s)
- V T Renard
- SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1, INAC, Grenoble, France.
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35
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Suga H, Hirayama Y, Morishima M, Suzuki T, Kageyama K, Hyakumachi M. Development of PCR Primers to Identify Fusarium oxysporum f. sp. fragariae. Plant Dis 2013; 97:619-625. [PMID: 30722188 DOI: 10.1094/pdis-07-12-0663-re] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium oxysporum f. sp. fragariae is a fungal pathogen causing Fusarium wilt on strawberry. Polymerase chain reaction (PCR) primers that can discriminate F. oxysporum f. sp. fragariae from nonpathogenic F. oxysporum would greatly assist pathogen identification. In order to develop a molecular diagnostic tool for this pathogen, transposable elements in the pathogen were characterized and used for designing a specific set of PCR primers. Portions of the transposable elements Fot3, Han, Hop, Hornet1, and Skippy were detected in all 33 strains of F. oxysporum f. sp. fragariae tested by PCR, whereas Foxy was detected in 32 strains and Impala sequences were detected in 30 strains. Two types of sequences were detected for Hop, two types for Impala, and three types for Skippy. The genomic region between Han and Skippy was amplified by an inter-retrotransposon amplified polymorphism technique, and PCR primers (FofraF and FofraR) to specifically identify F. oxysporum f. sp. fragariae were designed from this region. The developed PCR primers discriminated F. oxysporum f. sp. fragariae strains from nonpathogenic F. oxysporum strains and five other formae speciales. Conidia of F. oxysporum f. sp. fragariae could be detected in brown lowland-type soil by PCR using the primers. After preculturing the soil sample on FoG2 medium, 1 × 102 conidia/g of soil could be detected; without preculturing, 1 × 103 conidia/g of soil were detected.
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Affiliation(s)
- H Suga
- Life Science Research Center, Gifu University, Gifu 501-1193, Japan
| | - Y Hirayama
- Nara Prefectural Experiment Station, Nara 634-0813, Japan
| | - M Morishima
- Tochigi Prefectural Agricultural Experiment Station, Tochigi 320-0002 Japan
| | - T Suzuki
- Chiba Prefectural Agriculture and Forestry Research Center, Chiba 266-0006 Japan
| | - K Kageyama
- River Basin Research Center, Gifu University, 501-1193, Gifu, Japan
| | - M Hyakumachi
- Faculty of Applied Biological Science, Gifu University, 501-1193, Gifu, Japan
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Sonoda T, Wada M, Tomita H, Sakamoto C, Takatsuka T, Noto T, Iimura H, Matsuo Y, Kubo T, Shinozuka T, Wakui T, Mita H, Naimi S, Furukawa T, Itou Y, Schury P, Miyatake H, Jeong S, Ishiyama H, Watanabe Y, Hirayama Y. Development of a gas cell-based laser ion source for RIKEN PALIS. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s10751-013-0817-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Hara M, Yamagata K, Tomino Y, Saito A, Hirayama Y, Ogasawara S, Kurosawa H, Sekine S, Yan K. Urinary podocalyxin is an early marker for podocyte injury in patients with diabetes: establishment of a highly sensitive ELISA to detect urinary podocalyxin. Diabetologia 2012; 55:2913-9. [PMID: 22854890 PMCID: PMC3464371 DOI: 10.1007/s00125-012-2661-7] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 06/19/2012] [Indexed: 11/27/2022]
Abstract
AIMS/OBJECTIVE Nephropathy, a major complication of diabetes, is the leading cause of end-stage renal disease. Recent studies have demonstrated that podocyte injury is involved in the onset of and progression to renal insufficiency. Here, we describe a novel, highly sensitive ELISA for detecting urinary podocalyxin, a glycoconjugate on the podocyte apical surface that indicates podocyte injury, particularly in the early phase of diabetic nephropathy. METHODS Urine samples from patients with glomerular diseases (n = 142) and type 2 diabetes (n = 71) were used to quantify urinary podocalyxin by ELISA. Urine samples were obtained from 69 healthy controls for whom laboratory data were within normal values. Podocalyxin was detected in urine by immunofluorescence, immunoelectron microscopy and western blotting. RESULTS Morphologically, urinary podocalyxin was present as a vesicular structure; western blotting showed it as a positive band at 165-170 kDa. Levels of urinary podocalyxin were elevated in patients with various glomerular diseases and patients with diabetes. In patients with diabetes, urinary podocalyxin was higher than the cut-off value in 53.8% patients at the normoalbuminuric stage, 64.7% at the microalbuminuric stage and 66.7% at the macroalbuminuric stage. Positive correlations were observed between urinary podocalyxin levels and HbA(1c), urinary β(2) microglobulin, α(1) microglobulin and urinary N-acetyl-β-D-glucosaminidase, although urinary podocalyxin levels were not correlated with other laboratory markers such as blood pressure, lipid level, serum creatinine, estimated GFR or proteinuria. CONCLUSIONS/INTERPRETATION Urinary podocalyxin may be a useful biomarker for detecting early podocyte injury in patients with diabetes.
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Affiliation(s)
- M Hara
- Department of Pediatrics, Yoshida Hospital, Yoshida 32-14, Tsubame City, 959-0242 Niigata, Japan.
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38
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Hashimoto K, Champel T, Florens S, Sohrmann C, Wiebe J, Hirayama Y, Römer RA, Wiesendanger R, Morgenstern M. Robust nodal structure of Landau level wave functions revealed by Fourier transform scanning tunneling spectroscopy. Phys Rev Lett 2012; 109:116805. [PMID: 23005665 DOI: 10.1103/physrevlett.109.116805] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Indexed: 06/01/2023]
Abstract
Scanning tunneling spectroscopy is used to study the real-space local density of states of a two-dimensional electron system in a magnetic field, in particular within higher Landau levels. By Fourier transforming the local density of states, we find a set of n radial minima at fixed momenta for the nth Landau levels. The momenta of the minima depend only on the inverse magnetic length. By comparison with analytical theory and numerical simulations, we attribute the minima to the nodes of the quantum cyclotron orbits, which decouple in a Fourier representation from the random guiding center motion due to disorder. Adequate Fourier filtering reveals the nodal structure in real space in some areas of the sample with relatively smooth potential disorder.
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Affiliation(s)
- K Hashimoto
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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39
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Jeong SC, Oyaizu M, Imai N, Hirayama Y, Ishiyama H, Miyatake H, Niki K, Okada M, Watanabe YX, Otokawa Y, Osa A, Ichikawa S. Wall-loss distribution of charge breeding ions in an electron cyclotron resonance ion source. Rev Sci Instrum 2012; 83:02A910. [PMID: 22380251 DOI: 10.1063/1.3670740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated the ion-loss distribution on the sidewall of an electron cyclotron resonance (ECR) plasma chamber using the 18-GHz ECR charge breeder at the Tokai Radioactive Ion Accelerator Complex (TRIAC). Similarities and differences between the ion-loss distributions (longitudinal and azimuthal) of different ion species (i.e., radioactive (111)In(1+) and (140)Xe(1+) ions that are typical volatile and nonvolatile elements) was qualitatively discussed to understand the element dependence of the charge breeding efficiency. Especially, the similarities represent universal ion loss characteristics in an ECR charge breeder, which are different from the loss patterns of electrons on the ECRIS wall.
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Affiliation(s)
- S C Jeong
- Institute for Particle and Nuclear Physics (IPNS), High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan.
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Sonne C, Bott-Fluegel L, Hauck S, Michalk F, Lesevic H, Demetz G, Braun D, Hausleiter J, Schoemig A, Kolb C, Hirayama Y, Tsukamoto M, Hotta D, Yokoyama H, Kikuchi K, Ohori K, Sato N, Kawamura Y, Hasebe N, Kaladaridis A, Bramos D, Skaltsiotis I, Kottis G, Antoniou A, Matthaios I, Agrios I, Vasiladiotis N, Pamboucas C, Toumanidis S, Minati M, Cavarretta E, De Ruvo E, Rebecchi M, Sciarra L, Matera S, Fratini S, Zuccaro L, Lioy E, Calo' L, Esposito C, Chinali M, D' Asaro M, Toscano A, Iacobelli R, Del Pasqua A, Di Clemente S, Parisi F, Pongiglione G, Rinelli G, Djordjevic-Dikic A, Nikcevic G, Raspopovic S, Jovanovic V, Tesic M, Djordjevic S, Milasinovic G, Gurel E, Tigen K, Karaahmet T, Dundar C, Guler A, Fotbolcu H, Basaran Y, Risum N, Williams E, Khouri M, Jackson K, Olsen N, Jons C, Storm K, Velazquez EJ, Kisslo J, Sogaard P, Separovic Hanzevacki J, Baricevic Z, Pezo Nikolic B, Lovric D, Ivanac Vranesic I, Ernst A, Milicic D, Jurin H, Esmaeilzadeh M, Salehi Omran M, Maleki M, Haghjoo M, Noohi F, Ojaghi Haghighi Z, Sadeghpour A, Nakhostin Davari P, Bakhshandeh Abkenar H. Moderated Poster Sessions 4: Velocity and deformation imaging in electrophysiology * Friday 9 December 2011, 14:00-18:00 * Location: Moderated Poster Area. European Journal of Echocardiography 2011. [DOI: 10.1093/ejechocard/jer215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Takashina K, Niida Y, Renard VT, Fujiwara A, Fujisawa T, Muraki K, Hirayama Y. Impact of valley polarization on the resistivity in two dimensions. Phys Rev Lett 2011; 106:196403. [PMID: 21668179 DOI: 10.1103/physrevlett.106.196403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Indexed: 05/30/2023]
Abstract
We examine the temperature dependence of resistivity in a two-dimensional electron system formed in a silicon-on-insulator quantum well. The device allows us to tune the valley splitting continuously in addition to the electron density. Our data provide a global picture of how the resistivity and its temperature dependence change with valley polarization. At the boundary between valley-polarized and partially polarized regions, we demonstrate that there is an insulating contribution from spin-degenerate electrons occupying the upper valley-subband edge.
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Affiliation(s)
- K Takashina
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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Nakamura F, Hirayama Y, Morita I, Nakagaki H. Factors associated with Japanese dentists encouraging patients to use dental floss. Community Dent Health 2011; 28:111-115. [PMID: 21485247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE The objective of this study was to clarify to what extent Japanese dentists recommend dental floss and what factors influence dentists in encouraging their patients to use dental floss. PARTICIPANTS The subjects in this study were 291 dentists who were directors of dental clinics, selected by stratified sampling by age. RESULTS Dentists whose teachers at dental school had demonstrated dental flossing tended to recommend patients to use dental floss 2.2 (1.0-4.6: 95% CI) times more frequently compared with those who did not see demonstrations of flossing at dental school. Respondents who considered that using dental floss was very easy and easy, moderate, and difficult recommended patients to use dental floss 45.4 (11.2-183.9), 17.4 (6.6-45.8) and 5.9 (2.5-14.1) times more frequently, respectively, compared with those who considered it very difficult. Respondents who considered that using dental floss was effective, fairly effective or very effective in preventing dental caries recommended patients to use dental floss 3.8 (1.7-8.6), 3.8 (1.7-8.8) and 9.1 (3.6-23.0) times more frequently respectively, compared with those who considered it ineffective or only slightly effective. CONCLUSIONS The demonstration of the use of dental floss by teachers at their dental schools gave dentists a good impression and a positive opinion of dental flossing. This was closely associated with recommendations by dentists to their patients to use dental floss.
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Affiliation(s)
- F Nakamura
- Department of Preventive Dentistry and Dental Public Health, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
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Jeong SC, Oyaizu M, Imai N, Hirayama Y, Ishiyama H, Miyatake H, Niki K, Okada M, Watanabe YX, Otokawa Y, Osa A, Ichikawa S. Wall-loss distribution of charge breeding ions in an electron cyclotron resonance ion source. Rev Sci Instrum 2011; 82:033508. [PMID: 21456738 DOI: 10.1063/1.3567802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The ion loss distribution in an electron cyclotron resonance ion source (ECRIS) was investigated to understand the element dependence of the charge breeding efficiency in an electron cyclotron resonance (ECR) charge breeder. The radioactive (111)In(1+) and (140)Xe(1+) ions (typical nonvolatile and volatile elements, respectively) were injected into the ECR charge breeder at the Tokai Radioactive Ion Accelerator Complex to breed their charge states. Their respective residual activities on the sidewall of the cylindrical plasma chamber of the source were measured after charge breeding as functions of the azimuthal angle and longitudinal position and two-dimensional distributions of ions lost during charge breeding in the ECRIS were obtained. These distributions had different azimuthal symmetries. The origins of these different azimuthal symmetries are qualitatively discussed by analyzing the differences and similarities in the observed wall-loss patterns. The implications for improving the charge breeding efficiencies of nonvolatile elements in ECR charge breeders are described. The similarities represent universal ion loss characteristics in an ECR charge breeder, which are different from the loss patterns of electrons on the ECRIS wall.
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Affiliation(s)
- S C Jeong
- High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
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Futamoto M, Inaba N, Hirayama Y, Ito K, Honda Y. Compositional Microstructure and Micromagnetics of Co-Based Thin Film Media. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-517-243] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractElemental segregation of CoCrTa and CoCrPt thin films for longitudinal and perpendicular media is investigated using high spacial resolution transmission electron microscopes equipped with compositional analysis facilities. Strong Cr segregation exceeding 20 at% within 1.5-2 nm width is observed along the grain boundaries for both types of CoCrTa films prepared at elevated substrate temperatures. Weaker Cr segregation is observed along the grain boundaries of the longitudinal and the perpendicular CoCrPt films. The strong Cr segregation at grain boundaries is related with the small magnetic cluster size and the low media noise characteristics of CoCrTa thin film media. The Cr content inside the grain is several % lower than the average composition of the CoCrTa films. The magnetocrystalline anisotropy constants(Ku) for different Cr compositions are determined using single crystalline thin film technology to discuss the thermal stability of recorded information.
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Shinozaki K, Oda S, Sadahiro T, Nakamura M, Hirayama Y, Watanabe E, Tateishi Y, Nakanishi K, Kitamura N, Hirasawa H. Ammonia and lactate blood levels on hospital arrival predict neurological outcome in patients with out-of-hospital cardiac arrest. Crit Care 2011. [PMCID: PMC3066979 DOI: 10.1186/cc9725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Ikeda-Matsuo Y, Tanji H, Ota A, Hirayama Y, Uematsu S, Akira S, Sasaki Y. Microsomal prostaglandin E synthase-1 contributes to ischaemic excitotoxicity through prostaglandin E2 EP3 receptors. Br J Pharmacol 2010; 160:847-59. [PMID: 20590584 DOI: 10.1111/j.1476-5381.2010.00711.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Although microsomal prostaglandin E synthase (mPGES)-1 is known to contribute to stroke injury, the underlying mechanisms remain poorly understood. This study examines the hypothesis that EP(3) receptors contribute to stroke injury as downstream effectors of mPGES-1 neurotoxicity through Rho kinase activation. EXPERIMENTAL APPROACH We used a glutamate-induced excitotoxicity model in cultured rat and mouse hippocampal slices and a mouse middle cerebral artery occlusion-reperfusion model. Effects of an EP(3) receptor antagonist on neuronal damage in mPGES-1 knockout (KO) mice was compared with that in wild-type (WT) mice. KEY RESULTS In cultures of rat hippocampal slices, the mRNAs of EP(1-4) receptors were constitutively expressed and only the EP(3) receptor antagonist ONO-AE3-240 attenuated and only the EP(3) receptor agonist ONO-AE-248 augmented glutamate-induced excitotoxicity in CA1 neurons. Hippocampal slices from mPGES-1 KO mice showed less excitotoxicity than those from WT mice and the EP(3) receptor antagonist did not attenuate the excitotoxicity. In transient focal ischaemia models, injection (i.p.) of an EP(3) antagonist reduced infarction, oedema and neurological dysfunction in WT mice, but not in mPGES-1 KO mice, which showed less injury than WT mice. EP(3) receptor agonist-induced augmentation of excitotoxicity in vitro was ameliorated by the Rho kinase inhibitor Y-27632 and Pertussis toxin. The Rho kinase inhibitor HA-1077 also ameliorated stroke injury in vivo. CONCLUSION AND IMPLICATIONS Activity of mPGES-1 exacerbated stroke injury through EP(3) receptors and activation of Rho kinase and/or G(i). Thus, mPGES-1 and EP(3) receptors may be valuable therapeutic targets for treatment of human stroke.
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Affiliation(s)
- Y Ikeda-Matsuo
- Laboratory of Pharmacology, School of Pharmaceutical Sciences, Kitasato University, Tokyo, Japan.
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Fukuoka D, Oto K, Muro K, Hirayama Y, Kumada N. Skyrmion effect on the relaxation of spin waves in a quantum Hall ferromagnet. Phys Rev Lett 2010; 105:126802. [PMID: 20867665 DOI: 10.1103/physrevlett.105.126802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Indexed: 05/29/2023]
Abstract
Spin relaxation of two-dimensional electrons in a GaAs/AlGaAs quantum well was studied by time-resolved Kerr rotation measurements using a two-color pump and probe technique. In quantum Hall ferromagnets, the spin-wave relaxation is strongly influenced by the photogenerated Skyrmion and anti-Skyrmion pairs. By tuning the pump and probe lights to the lowest optical transition, an intrinsic filling factor dependence of spin relaxation is obtained without photogeneration of Skyrmions. The relaxation time of the spin wave presents a sharp peak at odd filling factors, accompanied by dips on both sides of it. The peculiar filling factor dependence of the spin-wave relaxation around quantum Hall ferromagnets can be explained by the interaction between the spin wave and Skyrmion. Observation of a similar feature around ν=1, 3, and 5 may suggest the existence of Skyrmions around higher odd filling factors.
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Affiliation(s)
- D Fukuoka
- Graduate School of Science, Chiba University, Chiba-shi, Chiba 263-8522, Japan
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Matsuzaki M, Takahashi R, Nakayama T, Shishikura K, Suzuki H, Hirayama Y, Osawa M, Oda H. Disruption of endothelial tight junctions in a patient with mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS). Neuropediatrics 2010; 41:72-4. [PMID: 20799154 DOI: 10.1055/s-0030-1261886] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
An electron microscopic study revealed disruption of capillary endothelial tight junctions (TJs) in both biopsied muscle, taken at 5 years and 1 month of age, and the autopsied brain, taken at 13 years and 6 months of age, in a patient with mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS) and mitochondrial DNA (mtDNA) point mutation A3243G. This endothelial barrier disruption might result in vasogenic edema and systemic lactic acidosis, possibly the critical pathology of MELAS.
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Affiliation(s)
- M Matsuzaki
- Department of Pediatrics, Tokyo Women's Medical University, Tokyo, Japan.
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Ikeda-Matsuo Y, Hirayama Y, Ota A, Uematsu S, Akira S, Sasaki Y. Microsomal prostaglandin E synthase-1 and cyclooxygenase-2 are both required for ischaemic excitotoxicity. Br J Pharmacol 2010; 159:1174-86. [PMID: 20128796 DOI: 10.1111/j.1476-5381.2009.00595.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND AND PURPOSE Although both microsomal prostaglandin E synthase (mPGES)-1 and cyclooxygenase (COX)-2 are critical factors in stroke injury, but the interactions between these enzymes in the ischaemic brain is still obscure. This study examines the hypothesis that mPGES-1 activity is required for COX-2 to cause neuronal damage in ischaemic injury. EXPERIMENTAL APPROACH We used a glutamate-induced excitotoxicity model in cultures of rat or mouse hippocampal slices and a mouse middle cerebral artery occlusion-reperfusion model in vivo. The effect of a COX-2 inhibitor on neuronal damage in mPGES-1 knockout (KO) mice was compared with that in wild-type (WT) mice. KEY RESULTS In rat hippocampal slices, glutamate-induced excitotoxicity, as well as prostaglandin (PG) E(2) production and PGES activation, was significantly attenuated by either MK-886 or NS-398, inhibitors of mPGES-1 and COX-2 respectively; however, co-application of these inhibitors had neither an additive nor a synergistic effect. The protective effect of NS-398 on the excitotoxicity observed in WT slices was completely abolished in mPGES-1 KO slices, which showed less excitotoxicity than WT slices. In the transient focal ischaemia model, mPGES-1 and COX-2 were co-localized in the infarct region of the cortex. Injection of NS-398 reduced not only ischaemic PGE(2) production, but also ischaemic injuries in WT mice, but not in mPGES-1 KO mice, which showed less dysfunction than WT mice. CONCLUSION AND IMPLICATIONS Microsomal prostaglandin E synthase-1 and COX-2 are co-induced by excess glutamate in ischaemic brain. These enzymes are co-localized and act together to exacerbate stroke injury, by excessive PGE(2) production.
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Ishigaki K, Nonaka I, Kuwatsuru R, Murakami T, Shishikukra K, Suzuki H, Hirayama Y, Osawa M. G.P.8.02 High density on skeletal muscle CT imaging indicates accumulation of calcium in autophagic vacuoles in childhood-onset Pompe disease. Neuromuscul Disord 2009. [DOI: 10.1016/j.nmd.2009.06.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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