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Ahn DS, Amano J, Baba H, Fukuda N, Geissel H, Inabe N, Ishikawa S, Iwasa N, Komatsubara T, Kubo T, Kusaka K, Morrissey DJ, Nakamura T, Ohtake M, Otsu H, Sakakibara T, Sato H, Sherrill BM, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tarasov OB, Ueno H, Yanagisawa Y, Yoshida K. Discovery of ^{39}Na. Phys Rev Lett 2022; 129:212502. [PMID: 36461972 DOI: 10.1103/physrevlett.129.212502] [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: 07/14/2022] [Revised: 09/08/2022] [Accepted: 09/14/2022] [Indexed: 06/17/2023]
Abstract
The new isotope ^{39}Na, the most neutron-rich sodium nucleus observed so far, was discovered at the RIKEN Nishina Center Radioactive Isotope Beam Factory using the projectile fragmentation of an intense ^{48}Ca beam at 345 MeV/nucleon on a beryllium target. Projectile fragments were separated and identified in flight with the large-acceptance two-stage separator BigRIPS. Nine ^{39}Na events have been unambiguously observed in this work and clearly establish the particle stability of ^{39}Na. Furthermore, the lack of observation of ^{35,36}Ne isotopes in this experiment significantly improves the overall confidence that ^{34}Ne is the neutron dripline nucleus of neon. These results provide new key information to understand nuclear binding and nuclear structure under extremely neutron-rich conditions. The newly established stability of ^{39}Na has a significant impact on nuclear models and theories predicting the neutron dripline and also provides a key to understanding the nuclear shell property of ^{39}Na at the neutron number N=28, which is normally a magic number.
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Affiliation(s)
- D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Amano
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Geissel
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ishikawa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - T Komatsubara
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kusaka
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - T Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
| | - M Ohtake
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sakakibara
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - H Sato
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Yokoyama R, Nishimura D, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yoshida K, Shimoura S. Mapping of a New Deformation Region around ^{62}Ti. Phys Rev Lett 2020; 125:122501. [PMID: 33016755 DOI: 10.1103/physrevlett.125.122501] [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: 04/03/2020] [Revised: 06/12/2020] [Accepted: 07/21/2020] [Indexed: 06/11/2023]
Abstract
We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60}Sc, ^{60-62}Ti, and ^{62-64}V were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of ^{62}Ti increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that ^{62}Ti is located close to the peak of the Jahn-Teller effect.
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Affiliation(s)
- S Michimasa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kiyokawa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Department of Physics and Astronomy, the University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Nishimura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Natural Sciences, Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan
| | - D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G P A Berg
- Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Dozono
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Furuno
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - S Kawase
- Department of Advanced Energy Engineering Science, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - K Kisamori
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kobayashi
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Kubota
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Matsushita
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Mizukami
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Nagakura
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - H Oikawa
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Sakai
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yamaguchi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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3
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Takahashi D, Hoshina N, Kabumoto Y, Maeda Y, Suzuki A, Tanabe H, Isobe J, Yamada T, Muroi K, Yanagisawa Y, Nakamura A, Fujimura Y, Saeki A, Ueda M, Matsumoto R, Asaoka H, Clarke JM, Harada Y, Umemoto E, Komatsu N, Okada T, Takayanagi H, Takeda K, Tomura M, Hase K. Microbiota-derived butyrate limits the autoimmune response by promoting the differentiation of follicular regulatory T cells. EBioMedicine 2020; 58:102913. [PMID: 32711255 PMCID: PMC7387783 DOI: 10.1016/j.ebiom.2020.102913] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/07/2020] [Accepted: 07/09/2020] [Indexed: 12/18/2022] Open
Abstract
Background Rheumatoid arthritis (RA) is a chronic debilitating autoimmune disorder with a high prevalence, especially in industrialized countries. Dysbiosis of the intestinal microbiota has been observed in RA patients. For instance, new-onset untreated RA (NORA) is associated with the underrepresentation of the Clostridium cluster XIVa, including Lachnospiraceae, which are major butyrate producers, although the pathological relevance has remained obscure. Follicular regulatory T (TFR) cells play critical regulatory roles in the pathogenesis of autoimmune diseases, including RA. Reduced number of circulating TFR cells has been associated with the elevation of autoantibodies and disease severity in RA. However, the contribution of commensal microbe-derived butyrate in controlling TFR cell differentiation remains unknown. Methods We examined the contribution of microbe-derived butyrate in controlling autoimmune arthritis using collagen-induced arthritis (CIA) and SKG arthritis models. We phenotyped autoimmune responses in the gut-associated lymphoid tissues (GALT) in the colon and joint-draining lymph nodes in the CIA model. We developed an in vitro CXCR5+Bcl-6+Foxp3+ TFR (iTFR) cell culture system and examined whether butyrate promotes the differentiation of iTFR cells. Findings Microbe-derived butyrate suppressed the development of autoimmune arthritis. The immunization of type II collagen (CII) caused hypertrophy of the GALT in the colon by amplifying the GC reaction prior to the onset of the CIA. Butyrate mitigated these pathological events by promoting TFR cell differentiation. Butyrate directly induced the differentiation of functional TFR cells in vitro by enhancing histone acetylation in TFR cell marker genes. This effect was attributed to histone deacetylase (HDAC) inhibition by butyrate, leading to histone hyperacetylation in the promoter region of the TFR-cell marker genes. The adoptive transfer of the butyrate-treated iTFR cells reduced CII-specific autoantibody production and thus ameliorated the symptoms of arthritis. Interpretation Accordingly, microbiota-derived butyrate serves as an environmental cue to enhance TFR cells, which suppress autoantibody production in the systemic lymphoid tissue, eventually ameliorating RA. Our findings provide mechanistic insights into the link between the gut environment and RA risk. Funding This work was supported by 10.13039/100009619AMED-Crest (16gm1010004h0101, 17gm1010004h0102, 18gm1010004h0103, and 19gm1010004s0104 to KH), the Japan Society for the Promotion of Science (JP17KT0055, JP16H01369, and JP18H04680 to KH; JP17K15734 to DT), Keio University Special Grant-in-Aid for Innovative Collaborative Research Projects (KH), Keio Gijuku Fukuzawa Memorial Fund for the Advancement of Education and Research (DT), the SECOM Science and Technology Foundation (KH), the Cell Science Research Foundation (KH), the Mochida Memorial Foundation for Medical and Pharmaceutical Research (DT), the Suzuken Memorial Foundation (KH and DT), the Takeda Science Foundation (KH and DT), The Science Research Promotion Fund, and The Promotion and Mutual Aid Corporation for Private Schools of Japan (KH).
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Affiliation(s)
- Daisuke Takahashi
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Naomi Hoshina
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Yuma Kabumoto
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Yuichi Maeda
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Suita, Osaka565-0871, Japan
| | - Akari Suzuki
- Laboratory for Autoimmune Diseases, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama, Kanagawa230-0045, Japan
| | - Hiyori Tanabe
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Junya Isobe
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Takahiro Yamada
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Kisara Muroi
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Yuto Yanagisawa
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Atsuo Nakamura
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan; Dairy Science and Technology Institute, Kyodo Milk Industry Co. Ltd., Nishitama, Tokyo190-0182, Japan
| | - Yumiko Fujimura
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Aiko Saeki
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Mizuki Ueda
- Laboratory of Immunology, Faculty of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka584-8540, Japan
| | - Ryohtaroh Matsumoto
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Hanako Asaoka
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan
| | - Julie M Clarke
- Preventative Health National Research Flagship, CSIRO Food and Nutritional Sciences, Adelaide, South Australia5000, Australia
| | - Yohsuke Harada
- Laboratory of Pharmaceutical Immunology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba278-8510, Japan
| | - Eiji Umemoto
- Department of Microbiology and Immunology, Graduate School of Medicine, WPI Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka565-0871, Japan
| | - Noriko Komatsu
- Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Takaharu Okada
- Laboratory for Tissue Dynamics, RIKEN IMS, Yokohama, Kanagawa230-0045, Japan
| | - Hiroshi Takayanagi
- Department of Microbiology and Immunology, Graduate School of Medicine, WPI Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka565-0871, Japan
| | - Kiyoshi Takeda
- Laboratory of Pharmaceutical Immunology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba278-8510, Japan
| | - Michio Tomura
- Laboratory of Immunology, Faculty of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka584-8540, Japan
| | - Koji Hase
- Division of Biochemistry, Faculty of Pharmacy and Graduate School of Pharmaceutical Sciences, Keio University, Minato-ku, Tokyo105-8512, Japan; International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo (IMSUT), Minato-ku, Tokyo108-8639, Japan.
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4
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Tang TL, Uesaka T, Kawase S, Beaumel D, Dozono M, Fujii T, Fukuda N, Fukunaga T, Galindo-Uribarri A, Hwang SH, Inabe N, Kameda D, Kawahara T, Kim W, Kisamori K, Kobayashi M, Kubo T, Kubota Y, Kusaka K, Lee CS, Maeda Y, Matsubara H, Michimasa S, Miya H, Noro T, Obertelli A, Ogata K, Ota S, Padilla-Rodal E, Sakaguchi S, Sakai H, Sasano M, Shimoura S, Stepanyan SS, Suzuki H, Takaki M, Takeda H, Tokieda H, Wakasa T, Wakui T, Yako K, Yanagisawa Y, Yasuda J, Yokoyama R, Yoshida K, Yoshida K, Zenihiro J. How Different is the Core of ^{25}F from ^{24}O_{g.s.} ? Phys Rev Lett 2020; 124:212502. [PMID: 32530645 DOI: 10.1103/physrevlett.124.212502] [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: 10/25/2018] [Revised: 12/15/2019] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
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Affiliation(s)
- T L Tang
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kawase
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - D Beaumel
- Institut de physique nucléaire d'Orsay, 91406 Orsay, France
| | - M Dozono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fujii
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fukunaga
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - A Galindo-Uribarri
- Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, Tennessee 37831, USA
| | - S H Hwang
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawahara
- Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba 274-8510, Japan
| | - W Kim
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - K Kisamori
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Kobayashi
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kubota
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Kusaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Maeda
- University of Miyazaki, 1-1 Gakuen Kibanadai-nishi, Miyazaki 889-2192, Japan
| | - H Matsubara
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Miya
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Noro
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - A Obertelli
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - K Ogata
- RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Department of Physics, Osaka City University, Osaka 558-8585, Japan
| | - S Ota
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - E Padilla-Rodal
- Universidad Nacional Autónoma de México, Instituto de Ciencias Nucleares, AP 70-543, México City 04510, DF, México
| | - S Sakaguchi
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - H Sakai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S S Stepanyan
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Tokieda
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Wakasa
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - T Wakui
- CYRIC, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - K Yako
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Yasuda
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - R Yokoyama
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Yoshida
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - J Zenihiro
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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5
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Tanaka M, Takechi M, Homma A, Fukuda M, Nishimura D, Suzuki T, Tanaka Y, Moriguchi T, Ahn DS, Aimaganbetov A, Amano M, Arakawa H, Bagchi S, Behr KH, Burtebayev N, Chikaato K, Du H, Ebata S, Fujii T, Fukuda N, Geissel H, Hori T, Horiuchi W, Hoshino S, Igosawa R, Ikeda A, Inabe N, Inomata K, Itahashi K, Izumikawa T, Kamioka D, Kanda N, Kato I, Kenzhina I, Korkulu Z, Kuk Y, Kusaka K, Matsuta K, Mihara M, Miyata E, Nagae D, Nakamura S, Nassurlla M, Nishimuro K, Nishizuka K, Ohnishi K, Ohtake M, Ohtsubo T, Omika S, Ong HJ, Ozawa A, Prochazka A, Sakurai H, Scheidenberger C, Shimizu Y, Sugihara T, Sumikama T, Suzuki H, Suzuki S, Takeda H, Tanaka YK, Tanihata I, Wada T, Wakayama K, Yagi S, Yamaguchi T, Yanagihara R, Yanagisawa Y, Yoshida K, Zholdybayev TK. Swelling of Doubly Magic ^{48}Ca Core in Ca Isotopes beyond N=28. Phys Rev Lett 2020; 124:102501. [PMID: 32216444 DOI: 10.1103/physrevlett.124.102501] [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: 09/18/2019] [Revised: 12/20/2019] [Accepted: 01/30/2020] [Indexed: 06/10/2023]
Abstract
Interaction cross sections for ^{42-51}Ca on a carbon target at 280 MeV/nucleon have been measured for the first time. The neutron number dependence of derived root-mean-square matter radii shows a significant increase beyond the neutron magic number N=28. Furthermore, this enhancement of matter radii is much larger than that of the previously measured charge radii, indicating a novel growth in neutron skin thickness. A simple examination based on the Fermi-type distribution, and mean field calculations point out that this anomalous enhancement of the nuclear size beyond N=28 results from an enlargement of the core by a sudden increase in the surface diffuseness of the neutron density distribution, which implies the swelling of the bare ^{48}Ca core in Ca isotopes beyond N=28.
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Affiliation(s)
- M Tanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
- Research Center for Superheavy Elements, Kyushu University, Fukuoka 819-0395, Japan
| | - M Takechi
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - A Homma
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - M Fukuda
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - D Nishimura
- Department of Physics, Tokyo City University, Setagaya, Tokyo 158-8557, Japan
| | - T Suzuki
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - Y Tanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Moriguchi
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - D S Ahn
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - A Aimaganbetov
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
- L.N. Gumilyov Eurasian National University, 010008 Astana, Kazakhstan
| | - M Amano
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - H Arakawa
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - S Bagchi
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- Justus Liebig University, 35392 Giessen, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - K-H Behr
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - N Burtebayev
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
| | - K Chikaato
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - H Du
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Ebata
- Department of Physics, Saitama University, Saitama 338-8570, Japan
- School of Environment and Society, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - T Fujii
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - N Fukuda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - T Hori
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - W Horiuchi
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - S Hoshino
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - R Igosawa
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - A Ikeda
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - N Inabe
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - K Inomata
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - K Itahashi
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - T Izumikawa
- Institute for Research Promotion, Niigata University, Niigata 950-8510, Japan
| | - D Kamioka
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - N Kanda
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - I Kato
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - I Kenzhina
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
- Al-Farabi Kazakh National University, 050040 Almaty, Kazakhstan
| | - Z Korkulu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - Y Kuk
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
- L.N. Gumilyov Eurasian National University, 010008 Astana, Kazakhstan
| | - K Kusaka
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - K Matsuta
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Mihara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - E Miyata
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - D Nagae
- Research Center for Superheavy Elements, Kyushu University, Fukuoka 819-0395, Japan
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - S Nakamura
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Nassurlla
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
- Al-Farabi Kazakh National University, 050040 Almaty, Kazakhstan
| | - K Nishimuro
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - K Nishizuka
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - K Ohnishi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Ohtake
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - T Ohtsubo
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - S Omika
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - H J Ong
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - A Ozawa
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - A Prochazka
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - H Sakurai
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - C Scheidenberger
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - Y Shimizu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - T Sugihara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Sumikama
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - S Suzuki
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - H Takeda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - Y K Tanaka
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - I Tanihata
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- School of Physics and Nuclear Energy Engineering, Beihang University, 100191 Beijing, China
| | - T Wada
- Department of Physics, Niigata University, Ikarashi, Niigata 951-2181, Japan
| | - K Wakayama
- Department of Physics, Saitama University, Saitama 338-8570, Japan
| | - S Yagi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Yamaguchi
- Department of Physics, Saitama University, Saitama 338-8570, Japan
- Tomonaga Center for the History of the Universe, University of Tsukuba, Ibaraki 305-8571, Japan
| | - R Yanagihara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - T K Zholdybayev
- Institute of Nuclear Physics, 050032 Almaty, Kazakhstan
- Al-Farabi Kazakh National University, 050040 Almaty, Kazakhstan
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6
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Ahn DS, Fukuda N, Geissel H, Inabe N, Iwasa N, Kubo T, Kusaka K, Morrissey DJ, Murai D, Nakamura T, Ohtake M, Otsu H, Sato H, Sherrill BM, Shimizu Y, Suzuki H, Takeda H, Tarasov OB, Ueno H, Yanagisawa Y, Yoshida K. Location of the Neutron Dripline at Fluorine and Neon. Phys Rev Lett 2019; 123:212501. [PMID: 31809143 DOI: 10.1103/physrevlett.123.212501] [Citation(s) in RCA: 5] [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: 03/28/2019] [Indexed: 06/10/2023]
Abstract
A search for the heaviest isotopes of fluorine, neon, and sodium was conducted by fragmentation of an intense ^{48}Ca beam at 345 MeV/nucleon with a 20-mm-thick beryllium target and identification of isotopes in the large-acceptance separator BigRIPS at the RIKEN Radioactive Isotope Beam Factory. No events were observed for ^{32,33}F, ^{35,36}Ne, and ^{38}Na and only one event for ^{39}Na after extensive running. Comparison with predicted yields excludes the existence of bound states of these unobserved isotopes with high confidence levels. The present work indicates that ^{31}F and ^{34}Ne are the heaviest bound isotopes of fluorine and neon, respectively. The neutron dripline has thus been experimentally confirmed up to neon for the first time since ^{24}O was confirmed to be the dripline nucleus nearly 20 years ago. These data provide new keys to understanding the nuclear stability at extremely neutron-rich conditions.
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Affiliation(s)
- D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Geissel
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - T Kubo
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kusaka
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - D Murai
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - T Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
| | - M Ohtake
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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7
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Shibata M, Sugane K, Yanagisawa Y. Biobased polymer networks by the thiol-ene photopolymerization of allylated p-coumaric and caffeic acids. Polym J 2019. [DOI: 10.1038/s41428-018-0165-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Nishimura D, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yokoyama R, Yoshida K, Shimoura S. Magic Nature of Neutrons in ^{54}Ca: First Mass Measurements of ^{55-57}Ca. Phys Rev Lett 2018; 121:022506. [PMID: 30085708 DOI: 10.1103/physrevlett.121.022506] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 04/21/2018] [Indexed: 06/08/2023]
Abstract
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990) keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.
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Affiliation(s)
- S Michimasa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kiyokawa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G P A Berg
- Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Dozono
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Furuno
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - S Kawase
- Department of Advanced Energy Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - K Kisamori
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kobayashi
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Kubota
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Matsushita
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Mizukami
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Nagakura
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - D Nishimura
- Department of Physics, Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan
| | - H Oikawa
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Sakai
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yamaguchi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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9
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Tarasov OB, Ahn DS, Bazin D, Fukuda N, Gade A, Hausmann M, Inabe N, Ishikawa S, Iwasa N, Kawata K, Komatsubara T, Kubo T, Kusaka K, Morrissey DJ, Ohtake M, Otsu H, Portillo M, Sakakibara T, Sakurai H, Sato H, Sherrill BM, Shimizu Y, Stolz A, Sumikama T, Suzuki H, Takeda H, Thoennessen M, Ueno H, Yanagisawa Y, Yoshida K. Discovery of ^{60}Ca and Implications For the Stability of ^{70}Ca. Phys Rev Lett 2018; 121:022501. [PMID: 30085743 DOI: 10.1103/physrevlett.121.022501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/11/2018] [Indexed: 06/08/2023]
Abstract
The discovery of the important neutron-rich nucleus _{20}^{60}Ca_{40} and seven others near the limits of nuclear stability is reported from the fragmentation of a 345 MeV/u ^{70}Zn projectile beam on ^{9}Be targets at the radioactive ion-beam factory of the RIKEN Nishina Center. The produced fragments were analyzed and unambiguously identified using the BigRIPS two-stage in-flight separator. The eight new neutron-rich nuclei discovered, ^{47}P, ^{49}S, ^{52}Cl, ^{54}Ar, ^{57}K, ^{59,60}Ca, and ^{62}Sc, are the most neutron-rich isotopes of the respective elements. In addition, one event consistent with ^{59}K was registered. The results are compared with the drip lines predicted by a variety of mass models and it is found that the models in best agreement with the observed limits of existence in the explored region tend to predict the even-mass Ca isotopes to be bound out to at least ^{70}Ca.
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Affiliation(s)
- O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Moscow Region, Russian Federation
| | - D S Ahn
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Fukuda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Hausmann
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Inabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ishikawa
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - K Kawata
- Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Komatsubara
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Kusaka
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Ohtake
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Portillo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Sakakibara
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - H Sakurai
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Sumikama
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Thoennessen
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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10
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Noji S, Sakai H, Aoi N, Baba H, Berg GPA, Doornenbal P, Dozono M, Fukuda N, Inabe N, Kameda D, Kawabata T, Kawase S, Kikuchi Y, Kisamori K, Kubo T, Maeda Y, Matsubara H, Michimasa S, Miki K, Miya H, Miyasako H, Sakaguchi S, Sasamoto Y, Shimoura S, Takaki M, Takeda H, Takeuchi S, Tokieda H, Ohnishi T, Ota S, Uesaka T, Wang H, Yako K, Yanagisawa Y, Yokota N, Yoshida K, Zegers RGT. Excitation of the Isovector Spin Monopole Resonance via the Exothermic ^{90}Zr(^{12}N,^{12}C) Reaction at 175 MeV/u. Phys Rev Lett 2018; 120:172501. [PMID: 29756826 DOI: 10.1103/physrevlett.120.172501] [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: 01/30/2018] [Revised: 03/09/2018] [Indexed: 06/08/2023]
Abstract
The (^{12}N, ^{12}C) charge-exchange reaction at 175 MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and asymmetric nuclear matter. This probe, now available through the production of ^{12}N as a secondary rare-isotope beam, is exothermic, is strongly absorbed at the surface of the target nucleus, and provides selectivity for spin-transfer excitations. All three properties enhance the excitation of the IVSMR compared to other, primarily light-ion, probes, which have been used to study the IVSMR thus far. The ^{90}Zr(^{12}N,^{12}C) reaction was measured and the excitation energy spectra up to about 70 MeV for both the spin-transfer and non-spin-transfer channels were deduced separately by tagging the decay by γ emission from the ^{12}C ejectile. Besides the well-known Gamow-Teller and isobaric analog transitions, a clear signature of the IVSMR was identified. By comparing with the results from light-ion reactions on the same target nucleus and theoretical predictions, the suitability of this new probe for studying the IVSMR was confirmed.
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Affiliation(s)
- S Noji
- Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - H Sakai
- Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Aoi
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - G P A Berg
- Department of Physics, University of Notre Dame, Nieuwland Science Hall, Notre Dame, Indiana 46556, USA
- The JINA Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA
| | - P Doornenbal
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Dozono
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Inabe
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Kameda
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Kitashirakawa, Oiwakecho, Sakyo, Kyoto 606-8502, Japan
| | - S Kawase
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - Y Kikuchi
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - K Kisamori
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - T Kubo
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Maeda
- Department of Applied Physics, University of Miyazaki, Miyazaki, Miyazaki 889-2192, Japan
| | - H Matsubara
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - K Miki
- Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Miya
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - H Miyasako
- Department of Applied Physics, University of Miyazaki, Miyazaki, Miyazaki 889-2192, Japan
| | - S Sakaguchi
- Department of Physics, Kyushu University, Nishi, Fukuoka 819-0395, Japan
| | - Y Sasamoto
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Tokieda
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - T Ohnishi
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ota
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
| | - H Wang
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Yokota
- Department of Physics, Kyoto University, Kitashirakawa, Oiwakecho, Sakyo, Kyoto 606-8502, Japan
| | - K Yoshida
- RIKEN Nishina Center, Hirosawa, Wako, Saitama 351-0198, Japan
| | - R G T Zegers
- The JINA Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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11
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Ito S, Iwao H, Sakata J, Inoue M, Omori K, Yanagisawa Y. Simultaneous spawning by female stream goby Rhinogobius sp. and the association with brood cannibalism by nesting males. J Fish Biol 2016; 89:1592-1602. [PMID: 27325563 DOI: 10.1111/jfb.13060] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 05/11/2016] [Indexed: 06/06/2023]
Abstract
A laboratory experiment was conducted by varying the undersurface area of nesting substratum and the number of females in an experimental tank to elucidate the determinants of the mating pattern in the stream goby, Rhinogobius sp. cross-band type. Males with larger nests tended to attract two or more females to their nest in a tank. Moreover, males spawned simultaneously with multiple females and entire brood cannibalism by males was rarely observed under a female-biased sex ratio. When males spawned with a single female with low fecundity, however, entire brood cannibalism occurred at a high frequency, suggesting that a male guarding a nest with fewer eggs consumes the brood. Therefore, spawning behaviour of females that leads to a large egg mass would decrease the risk of entire brood cannibalism. In this species, simultaneous spawning by multiple females in a nest serves as a female counter-measure against entire brood cannibalism. These results suggest that a conflict of interest between the sexes through brood cannibalism is a major determinant of simultaneous spawning.
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Affiliation(s)
- S Ito
- Hokkaido National Fisheries Research Institute, Fisheries Research Agency, 116 Katsurakoi, Kushiro, Hokkaido, 085-0802, Japan
| | - H Iwao
- Department of Biology, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - J Sakata
- Department of Biology, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - M Inoue
- Department of Biology, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - K Omori
- Center for Marine Environmental Studies, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - Y Yanagisawa
- Department of Biology, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
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12
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Kisamori K, Shimoura S, Miya H, Michimasa S, Ota S, Assie M, Baba H, Baba T, Beaumel D, Dozono M, Fujii T, Fukuda N, Go S, Hammache F, Ideguchi E, Inabe N, Itoh M, Kameda D, Kawase S, Kawabata T, Kobayashi M, Kondo Y, Kubo T, Kubota Y, Kurata-Nishimura M, Lee CS, Maeda Y, Matsubara H, Miki K, Nishi T, Noji S, Sakaguchi S, Sakai H, Sasamoto Y, Sasano M, Sato H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tamii A, Tang L, Tokieda H, Tsumura M, Uesaka T, Yako K, Yanagisawa Y, Yokoyama R, Yoshida K. Candidate Resonant Tetraneutron State Populated by the ^{4}He(^{8}He,^{8}Be) Reaction. Phys Rev Lett 2016; 116:052501. [PMID: 26894705 DOI: 10.1103/physrevlett.116.052501] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 06/05/2023]
Abstract
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
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Affiliation(s)
- K Kisamori
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Assie
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Baba
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - D Beaumel
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - M Dozono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fujii
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Go
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - F Hammache
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Itoh
- Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kawase
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Kondo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8550, Japan
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kubota
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | | | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Maeda
- Faculty of Engineering, University of Miyazaki, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan
| | - H Matsubara
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba, Japan
| | - K Miki
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - T Nishi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Noji
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - S Sakaguchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - H Sakai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Sasamoto
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Tamii
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - L Tang
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Tsumura
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Yoshida
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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13
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Piao R, Iguchi S, Hamada M, Matsumoto S, Suematsu H, Saito AT, Li J, Nakagome H, Takao T, Takahashi M, Maeda H, Yanagisawa Y. High resolution NMR measurements using a 400MHz NMR with an (RE)Ba2Cu3O7-x high-temperature superconducting inner coil: Towards a compact super-high-field NMR. J Magn Reson 2016; 263:164-171. [PMID: 26778351 DOI: 10.1016/j.jmr.2015.11.015] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 11/11/2015] [Accepted: 11/13/2015] [Indexed: 06/05/2023]
Abstract
Use of high-temperature superconducting (HTS) inner coils in combination with conventional low-temperature superconducting (LTS) outer coils for an NMR magnet, i.e. a LTS/HTS NMR magnet, is a suitable option to realize a high-resolution NMR spectrometer with operating frequency >1GHz. From the standpoint of creating a compact magnet, (RE: Rare earth) Ba2Cu3O7-x (REBCO) HTS inner coils which can tolerate a strong hoop stress caused by a Lorentz force are preferred. However, in our previous work on a first-generation 400MHz LTS/REBCO NMR magnet, the NMR resolution and sensitivity were about ten times worse than that of a conventional LTS NMR magnet. The result was caused by a large field inhomogeneity in the REBCO coil itself and the shielding effect of a screening current induced in that coil. In the present paper, we describe the operation of a modified 400MHz LTS/REBCO NMR magnet with an advanced field compensation technology using a combination of novel ferromagnetic shimming and an appropriate procedure for NMR spectrum line shape optimization. We succeeded in obtaining a good NMR line shape and 2D NOESY spectrum for a lysozyme aqueous sample. We believe that this technology is indispensable for the realization of a compact super-high-field high-resolution NMR.
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Affiliation(s)
- R Piao
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - S Iguchi
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Faculty of Science and Technology, Sophia University, Yotsuya 102-8554, Japan
| | - M Hamada
- Japan Superconductor Technology, Inc., Kobe, Hyogo 651-2271, Japan
| | - S Matsumoto
- Superconducting Wire Unit, National Institute for Materials Science, Tsukuba 305-0003, Japan
| | - H Suematsu
- JEOL RESONANCE Inc., Akishima, Tokyo 196-8558, Japan
| | - A T Saito
- Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - J Li
- Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - H Nakagome
- Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - T Takao
- Faculty of Science and Technology, Sophia University, Yotsuya 102-8554, Japan
| | - M Takahashi
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan
| | - H Maeda
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan
| | - Y Yanagisawa
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan.
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Ohmoto T, Nishitsuji K, Yoshitani N, Mizuguchi M, Yanagisawa Y, Saito H, Sakashita N. K604, a specific acyl‑CoA:cholesterol acyltransferase 1 inhibitor, suppresses proliferation of U251‑MG glioblastoma cells. Mol Med Rep 2015; 12:6037-42. [PMID: 26252415 DOI: 10.3892/mmr.2015.4200] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 07/23/2015] [Indexed: 11/06/2022] Open
Abstract
Glioblastoma is the most aggressive type of brain tumor and has a poor prognosis. Increased levels of cholesteryl ester and simultaneous expression of acyl‑CoA:cholesterol acyltransferase 1 (ACAT1) in tumor cells indicated that cholesterol esterification is critical to tumor growth. The present study confirmed that human glioblastoma tissues as well as the glioblastoma cell line U251‑MG showed significant expression of ACAT1. ACAT1 expression in U251‑MG cells increased in a cell proliferation‑dependent manner. K604, a selective ACAT1 inhibitor, suppressed the proliferation of U251‑MG cells and downregulated the activation of Akt and extracellular signal‑regulated kinase in proliferating glioblastoma cells. These results suggested that ACAT1 may be a therapeutic target for the treatment of glioblastoma, with K604 as an effective therapeutic agent.
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Affiliation(s)
- Takuji Ohmoto
- Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770‑8503, Japan
| | - Kazuchika Nishitsuji
- Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770‑8503, Japan
| | - Nobuyuki Yoshitani
- Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770‑8503, Japan
| | - Makoto Mizuguchi
- Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770‑8503, Japan
| | - Yuto Yanagisawa
- Department of Physical Pharmaceutics, Institute of Health Biosciences and Graduate School of Pharmaceutical Sciences, The University of Tokushima, Tokushima 770‑8505, Japan
| | - Hiroyuki Saito
- Department of Physical Pharmaceutics, Institute of Health Biosciences and Graduate School of Pharmaceutical Sciences, The University of Tokushima, Tokushima 770‑8505, Japan
| | - Naomi Sakashita
- Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770‑8503, Japan
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15
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Takase K, Matsuo Y, Yanagisawa Y, Higashine K, Oda M, Manabe M, Shimada Y, Ogura R, Takahashi T, Hiasa Y. Efficacy of a home-based exercise program for recently hospitalized chronic heart failure patients. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1448] [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: 10/23/2022]
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16
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Ohmoto T, Yoshitani N, Nishitsuji K, Takayama T, Yanagisawa Y, Takeya M, Sakashita N. CD44-expressing undifferentiated carcinoma with rhabdoid features of the pancreas: molecular analysis of aggressive invasion and metastasis. Pathol Int 2015; 65:264-70. [PMID: 25753521 DOI: 10.1111/pin.12283] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 02/06/2015] [Indexed: 01/20/2023]
Abstract
Carcinoma with rhabdoid features is a rare malignant tumor with a poor prognosis whose molecular mechanism for aggressive behavior is unclear. We describe an undifferentiated pancreatic carcinoma with rhabdoid features that demonstrated extensive invasion and metastasis. Examination of a 63-year-old man with back pain disclosed a retroperitoneal tumor with multiple metastases. Lymph node biopsy revealed an undifferentiated carcinoma of unknown origin. Intensive chemotherapy was ineffective; the patient died 3 months after initial symptoms. Autopsy showed that the tumor displaced the retroperitoneal space: it diffusely invaded and destroyed the pancreas and duodenum. Histology demonstrated tumor cells with eccentric vesicular nuclei, large nucleoli, juxtanuclear eosinophilic inclusions, and poor cell adhesion. Immunohistochemistry showed that tumor cells expressed cytokeratin and vimentin, and electron microscopy confirmed a perinuclear mass of intermediate fibrils and lipid droplets, which indicated an undifferentiated carcinoma with rhabdoid features. Tumor tissue contained hyaluronan; tumor cells strongly expressed CD44, matrix metalloproteinase-9, hypoxia-inducible factor-1α, hyaluronan synthase 2, and acyl-CoA:cholesterol acyltransferase 1 and had a high Ki-67(+) ratio. Since hyaluronan is a ligand for CD44, formation of CD44-hyaluronan complex on the cell surface activates CD44 and this activation may explain why the tumor manifested aggressive invasion and metastasis throughout the clinical course.
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Affiliation(s)
- Takuji Ohmoto
- Undergraduate student, The University of Tokushima School of Medicine, Tokushima, Japan; Department of Human Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
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17
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Takechi Y, Yanagisawa Y, Nishitsuji K, Uchimura K, Kawakami T, Kawakami K, Okuhira K, Saito H. Arginine-Glycosaminoglycan Interaction Regulates Penetration Efficiency of Arginine-Rich Cell-Penetrating Peptides in Biological Membrane. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.482] [Citation(s) in RCA: 2] [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: 11/16/2022] Open
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18
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Yanagisawa Y, Piao R, Iguchi S, Nakagome H, Takao T, Kominato K, Hamada M, Matsumoto S, Suematsu H, Jin X, Takahashi M, Yamazaki T, Maeda H. Operation of a 400MHz NMR magnet using a (RE:Rare Earth)Ba 2Cu 3O 7-x high-temperature superconducting coil: Towards an ultra-compact super-high field NMR spectrometer operated beyond 1GHz. J Magn Reson 2014; 249:38-48. [PMID: 25462945 DOI: 10.1016/j.jmr.2014.10.006] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 10/01/2014] [Accepted: 10/05/2014] [Indexed: 06/04/2023]
Abstract
High-temperature superconductors (HTS) are the key technology to achieve super-high magnetic field nuclear magnetic resonance (NMR) spectrometers with an operating frequency far beyond 1GHz (23.5T). (RE)Ba2Cu3O7-x (REBCO, RE: rare earth) conductors have an advantage over Bi2Sr2Ca2Cu3O10-x (Bi-2223) and Bi2Sr2CaCu2O8-x (Bi-2212) conductors in that they have very high tensile strengths and tolerate strong electromagnetic hoop stress, thereby having the potential to act as an ultra-compact super-high field NMR magnet. As a first step, we developed the world's first NMR magnet comprising an inner REBCO coil and outer low-temperature superconducting (LTS) coils. The magnet was successfully charged without degradation and mainly operated at 400MHz (9.39T). Technical problems for the NMR magnet due to screening current in the REBCO coil were clarified and solved as follows: (i) A remarkable temporal drift of the central magnetic field was suppressed by a current sweep reversal method utilizing ∼10% of the peak current. (ii) A Z2 field error harmonic of the main coil cannot be compensated by an outer correction coil and therefore an additional ferromagnetic shim was used. (iii) Large tesseral harmonics emerged that could not be corrected by cryoshim coils. Due to those harmonics, the resolution and sensitivity of NMR spectra are ten-fold lower than those for a conventional LTS NMR magnet. As a result, a HSQC spectrum could be achieved for a protein sample, while a NOESY spectrum could not be obtained. An ultra-compact 1.2GHz NMR magnet could be realized if we effectively take advantage of REBCO conductors, although this will require further research to suppress the effect of the screening current.
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Affiliation(s)
- Y Yanagisawa
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - R Piao
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - S Iguchi
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan; Faculty of Science and Technology, Sophia University, Yotsuya 102-8554, Japan
| | - H Nakagome
- Graduate School of Engineering, Chiba University, Chiba 236-8522, Japan
| | - T Takao
- Faculty of Science and Technology, Sophia University, Yotsuya 102-8554, Japan
| | - K Kominato
- Japan Superconductor Technology, Inc, Kobe, Hyogo 651-2271, Japan
| | - M Hamada
- Japan Superconductor Technology, Inc, Kobe, Hyogo 651-2271, Japan
| | - S Matsumoto
- Superconducting Wire Unit, National Institute for Materials Science, Tsukuba 305-0003, Japan
| | - H Suematsu
- JEOL RESONANCE Inc., Akishima, Tokyo 196-8558, Japan
| | - X Jin
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan
| | - M Takahashi
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan
| | - T Yamazaki
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan
| | - H Maeda
- Center for Life Science Technologies, RIKEN, Yokohama 230-0045, Japan.
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Suzuki S, Takechi M, Ohtsubo T, Nishimura D, Fukuda M, Kuboki T, Nagashima M, Suzuki T, Yamaguchi T, Ozawa A, Ohishi H, Moriguchi T, Sumikama T, Geissel H, Aoi N, Chen RJ, Fang DQ, Fukuda N, Fukuoka S, Furuki H, Inabe N, Ishibashi Y, Ito T, Izumikawa T, Kameda D, Kubo T, Lantz M, Lee C, Ma YG, Mihara M, Momota S, Nagae D, Nishikiori R, Niwa T, Ohnishi T, Okumura K, Ogura T, Sakurai H, Sato K, Shimbara Y, Suzuki H, Takeda H, Takeuchi S, Tanaka K, Uenishi H, Winkler M, Yanagisawa Y. Measurements of interaction cross sections for 22–35Na isotopes. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603084] [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: 11/15/2022] Open
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20
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Takechi M, Suzuki S, Nishimura D, Fukuda M, Ohtsubo T, Nagashima M, Suzuki T, Yamaguchi T, Ozawa A, Moriguchi T, Ohishi H, Sumikama T, Geissel H, Ishihara M, Aoi N, Chen RJ, Fang DQ, Fukuda N, Fukuoka S, Furuki H, Inabe N, Ishibashi Y, Itoh T, Izumikawa T, Kameda D, Kubo T, Lee CS, Lantz M, Ma YG, Matsuta K, Mihara M, Momota S, Nagae D, Nishikiori R, Niwa T, Ohnishi T, Okumura K, Ogura T, Sakurai H, Sato K, Shimbara Y, Suzuki H, Takeda H, Takeuchi S, Tanaka K, Uenishi H, Winkler M, Yanagisawa Y, Watanabe S, Minomo K, Tagami S, Shimada M, Kimura M, Matsumoto T, Shimizu YR, Yahiro M. Search for halo nucleus in Mg isotopes through the measurements of reaction cross sections towards the vicinity of neutron drip line. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602101] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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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21
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Ogata K, Sarentonglaga B, Yamaguchi M, Sasaki A, Kato Y, Wakabayashi M, Nishihara K, Yanagisawa Y, Fukui R, Takano H, Nagao Y. 62 EFFECTS OF VARYING GLUTATHIONE CONCENTRATIONS IN SEMEN EXTENDER ON THE QUALITY OF FROZEN–THAWED CANINE SPERM. Reprod Fertil Dev 2014. [DOI: 10.1071/rdv26n1ab62] [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: 11/23/2022] Open
Abstract
Trans-cervical insemination (TCI) with cryopreserved semen offers a potentially effective approach for breeding canids with specific genetic traits, such as guide dogs for the blind. However, there are technical difficulties in canine sperm cryopreservation, such as the composition of semen extender. The aim of this study was to evaluate the effects of glutathione (GSH) as an antioxidant in the semen extender to improve the quality of frozen-thawed dog sperm. A Tris-egg yolk-citrate extender containing 15.7 mg mL–1 of TRIS, 8.8 mg mL–1 of citric acid, 14.1 mg mL–1 of lactose, 25.4 mg mL–1 of raffinose, 1% (vol/vol) antibiotics, and 20% (vol/vol) egg yolk in ultra-pure water was used as the base medium. Twelve ejaculates were collected from 7 dogs. Each ejaculate was divided into 2 to 5 aliquots and extended with base extender supplemented with 0, 2.5, 5, 7.5, and 10 mM GSH as first dilution. The extended semen was equilibrated for 3 h at 4°C. An equal volume of second extender was added to obtain a final concentration of 6.5% glycerol and sperm per milliliter. The sperm samples were loaded in straws and frozen at 6 cm above the surface of LN2 for 15 min in a styrene foam box and plunged into the LN2. The frozen semen was thawed for evaluation. The motility of sperm was estimated with a phase-contrast microscope and the motile patterns were classified into the following grades: progressively motile at a high speed (+++), progressively motile at a moderate and low speed (++), motile without progression (+), and immotile (–). Then, the sperm motility index (SMI) was determined from the following formula as described previously (Iritani et al., 1975), with some modifications: the percentage of (+++) sperm + the percentage of (++) sperm × 0.75 + the percentage of (+) sperm × 0.5. Sperm motility and the SMI were determined at 0, 1, 2, 3, 4, 12, and 24 h after thawing. Acrosome status was evaluated at 4 h after thawing. Lipid peroxidation (LP) levels at 0 and 12 h after thawing were used to examine the antioxidant ability of GSH. Trans-cervical insemination was carried out on 5 bitches to evaluate the fertility of GSH-treated sperm. The TCI were performed nonsurgically with a laparoscope and deposited 2 mL of semen through a catheter. Each bitch was inseminated 1 to 2 times during oestrus. Data were analysed using ANOVA with the Tukey-Kramer method. We found that the rate of (+++) sperm in the 5 mM GSH group was higher than that in the 0 mM group from 1 to 24 h after thawing (P < 0.05). The SMI was higher in the 5 and 7.5 mM GSH groups than in the 0 mM group (P < 0.05). There were no significant differences in the control and 2.5 and 10 mM GSH groups. Long-term survival was increased in the 5 mM GSH group. Acrosome integrity was higher in the GSH-treated group. The level of LP was lower in the GSH-treated groups at 0 h after thawing (P < 0.05). Trans-cervical insemination with the 5 mM GSH-treated semen resulted in the delivery of 5 pups from 2 bitches. These results indicate that the cryopreservation with 5 mM GSH can improve the motility, viability, and fertility of frozen-thawed canine sperm by its antioxidant effects on the sperm membrane.
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22
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Matsuda M, Fishman RS, Hong T, Lee CH, Ushiyama T, Yanagisawa Y, Tomioka Y, Ito T. magnetic dispersion and anisotropy in multiferroic BiFeO3. Phys Rev Lett 2012; 109:067205. [PMID: 23006302 DOI: 10.1103/physrevlett.109.067205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Indexed: 06/01/2023]
Abstract
We have determined the full magnetic dispersion relations of multiferroic BiFeO3. In particular, two excitation gaps originating from magnetic anisotropies have been clearly observed. The direct observation of the gaps enables us to accurately determine the Dzyaloshinskii-Moriya (DM) interaction and the single ion anisotropy. The DM interaction supports a sizable magnetoelectric coupling in this compound.
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Affiliation(s)
- M Matsuda
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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23
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Miki K, Sakai H, Uesaka T, Baba H, Bai CL, Berg GPA, Fukuda N, Kameda D, Kawabata T, Kawase S, Kubo T, Michimasa S, Miya H, Noji S, Ohnishi T, Ota S, Saito A, Sasamoto Y, Sagawa H, Sasano M, Shimoura S, Takeda H, Tokieda H, Yako K, Yanagisawa Y, Zegers RGT. Identification of the β+ isovector spin monopole resonance via the 208Pb and 90Zr(t,3He) reactions at 300 MeV/u. Phys Rev Lett 2012; 108:262503. [PMID: 23004971 DOI: 10.1103/physrevlett.108.262503] [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: 03/23/2012] [Indexed: 06/01/2023]
Abstract
The double-differential cross sections for the (208)Pb and (90)Zr(t,(3)He) reactions at 300 MeV/u have been measured at the RI Beam Factory at RIKEN. This was the first physics experiment with the SHARAQ magnetic spectrometer. The combined analysis of the present (t,(3)He) data and previous (n,p) data provides the clearest identification for the β(+) isovector spin monopole resonance both in the (208)Tl and (90)Y nuclei, and puts the observations of this giant resonance on a firm foundation. The measured distributions of the (t,(3)He) monopole cross sections were well reproduced by the distorted-wave Born approximation calculation, where the target transition density was calculated with the self-consistent Hartree-Fock plus random-phase approximation using the T43 Skyrme interaction. A major part of the expected β(+) isovector spin monopole strength was found in the measured cross section spectra.
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Affiliation(s)
- K Miki
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
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24
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Pellegrino L, Pallecchi I, Bellingeri E, Canu G, Siri AS, Marré D, Yanagisawa Y, Ishikawa M, Matsumoto T, Tanaka H, Kawai T. AFM nanopatterning of transition metal oxide thin films. J Nanosci Nanotechnol 2010; 10:4471-4476. [PMID: 21128442 DOI: 10.1166/jnn.2010.2363] [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
In this paper we show diverse methods for patterning transition metal oxide (TMO) thin films by Local Anodic Oxidation (LAO) using an Atomic Force Microscope (AFM). At first, direct lithography by current-controlled LAO of TMO thin films and selective wet etching is presented. For insulating films or those whose AFM patterns cannot be selectively removed by wet etching, fabrication of nanomasks is required; thus, the fabrication of Molybdenum and TMO nanomasks is reported. As a further development, we show the AFM fabrication of Mo/poly(methylmethacrylate) (PMMA) nanomasks through multistep processes combining LAO of Mo and dry etching of PMMA. Detailed discussions and comparisons between these methods are presented.
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Affiliation(s)
- L Pellegrino
- CNR-INFM-LAMIA & Dipartimento di Fisica, Genova University, Corso Perrone 24, 16152 Genova, Italy
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25
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Yanagisawa Y, Nakagome H, Tennmei K, Hamada M, Yoshikawa M, Otsuka A, Hosono M, Kiyoshi T, Takahashi M, Yamazaki T, Maeda H. Operation of a 500 MHz high temperature superconducting NMR: towards an NMR spectrometer operating beyond 1 GHz. J Magn Reson 2010; 203:274-82. [PMID: 20149698 DOI: 10.1016/j.jmr.2010.01.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Revised: 01/14/2010] [Accepted: 01/15/2010] [Indexed: 05/15/2023]
Abstract
We have begun a project to develop an NMR spectrometer that operates at frequencies beyond 1 GHz (magnetic field strength in excess of 23.5 T) using a high temperature superconductor (HTS) innermost coil. As the first step, we developed a 500 MHz NMR with a Bi-2223 HTS innermost coil, which was operated in external current mode. The temporal magnetic field change of the NMR magnet after the coil charge was dominated by (i) the field fluctuation due to a DC power supply and (ii) relaxation in the screening current in the HTS tape conductor; effect (i) was stabilized by the 2H field-frequency lock system, while effect (ii) decreased with time due to relaxation of the screening current induced in the HTS coil and reached 10(-8)(0.01 ppm)/h on the 20th day after the coil charge, which was as small as the persistent current mode of the NMR magnet. The 1D (1)H NMR spectra obtained by the 500 MHz LTS/HTS magnet were nearly equivalent to those obtained by the LTS NMR magnet. The 2D-NOESY, 3D-HNCO and 3D-HNCACB spectra were achieved for ubiquitin by the 500 MHz LTS/HTS magnet; their quality was closely equivalent to that achieved by a conventional LTS NMR. Based on the results of numerical simulation, the effects of screening current-induced magnetic field changes are predicted to be harmless for the 1.03 GHz NMR magnet system.
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Affiliation(s)
- Y Yanagisawa
- Systems and Structural Biology Center, RIKEN, Yokohama 230-0045, Japan
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Doornenbal P, Scheit H, Aoi N, Takeuchi S, Li K, Takeshita E, Wang H, Baba H, Deguchi S, Fukuda N, Geissel H, Gernhäuser R, Gibelin J, Hachiuma I, Hara Y, Hinke C, Inabe N, Itahashi K, Itoh S, Kameda D, Kanno S, Kawada Y, Kobayashi N, Kondo Y, Krücken R, Kubo T, Kuboki T, Kusaka K, Lantz M, Michimasa S, Motobayashi T, Nakamura T, Nakao T, Namihira K, Nishimura S, Ohnishi T, Ohtake M, Orr NA, Otsu H, Ozeki K, Satou Y, Shimoura S, Sumikama T, Takechi M, Takeda H, Tanaka KN, Tanaka K, Togano Y, Winkler M, Yanagisawa Y, Yoneda K, Yoshida A, Yoshida K, Sakurai H. Spectroscopy of 32Ne and the "Island of Inversion". Phys Rev Lett 2009; 103:032501. [PMID: 19659270 DOI: 10.1103/physrevlett.103.032501] [Citation(s) in RCA: 2] [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: 05/15/2009] [Indexed: 05/28/2023]
Abstract
We report on the first spectroscopic study of the N=22 nucleus 32Ne at the newly completed RIKEN Radioactive Ion Beam Factory. A single gamma-ray line with an energy of 722(9) keV was observed in both inelastic scattering of a 226 MeV/u 32Ne beam on a carbon target and proton removal from 33Na at 245 MeV/u. This transition is assigned to the deexcitation of the first Jpi=2+ state in 32Ne to the 0+ ground state. Interpreted through comparison with state-of-the-art shell-model calculations, the low excitation energy demonstrates that the "island of inversion" extends to at least N=22 for the Ne isotopes.
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Affiliation(s)
- P Doornenbal
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
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27
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Nakayama K, Bayasgalan T, Yamanaka K, Kumada M, Gotoh T, Utsumi N, Yanagisawa Y, Okayama M, Kajii E, Ishibashi S, Iwamoto S. Large scale replication analysis of loci associated with lipid concentrations in a Japanese population. J Med Genet 2009; 46:370-4. [PMID: 19487539 DOI: 10.1136/jmg.2008.064063] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Recent genome wide association studies discovered seven novel loci that influence plasma concentrations of triglycerides, high density lipoprotein (HDL) and low density lipoprotein (LDL) cholesterol in Europeans. To date, large scale replication studies using populations with known differences in genome-wide linkage disequilibrium (LD) pattern have not been undertaken. METHODS To address this issue, we tested associations between single nucleotide polymorphisms (SNPs) within the seven novel loci and plasma lipid profiles in 21 010 Japanese individuals. RESULTS Multiple linear regression analyses showed that the rs3812316 in MLXIPL was strongly associated with triglyceride concentrations (p approximately 3.0x10(-11), 7.1 mg/dl decrease per minor C allele) and that rs599839 in CELSR2/PSRC1/SORT1 was strongly associated with LDL cholesterol concentrations (p approximately 3.1x10(-11), 4.7 mg/dl decrease per minor G allele) in the Japanese population. SNPs near ANGPTL3, TRIB1 and GALNT2 showed evidence for associations with triglyceride concentrations (3.6x10(-6)<p<5.1x10(-5)). SNP near TRIB1 showed association with LDL cholesterol concentrations (p approximately 1.2x10(-5)). On the other hand, SNPs in NCAN/CILP2/PBX4 and MVK/MMAB were not associated with any plasma lipid profiles in the Japanese population. Ethnic differences in LD pattern would explain the lack of association between these two loci and plasma lipid concentrations in the Japanese population. CONCLUSION Associations between the novel loci and plasma lipid concentrations were generally conserved in the Japanese population, with the exception of NCAN/CILP2/PBX4 and MVK/MMAB.
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Affiliation(s)
- K Nakayama
- Division of Human Genetics, Center for Community Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke-city, Tochigi, 329-0498 Japan.
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Gibelin J, Beaumel D, Motobayashi T, Blumenfeld Y, Aoi N, Baba H, Elekes Z, Fortier S, Frascaria N, Fukuda N, Gomi T, Ishikawa K, Kondo Y, Kubo T, Lima V, Nakamura T, Saito A, Satou Y, Scarpaci JA, Takeshita E, Takeuchi S, Teranishi T, Togano Y, Vinodkumar AM, Yanagisawa Y, Yoshida K. Decay pattern of pygmy states observed in neutron-rich 26Ne. Phys Rev Lett 2008; 101:212503. [PMID: 19113406 DOI: 10.1103/physrevlett.101.212503] [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: 03/07/2008] [Indexed: 05/27/2023]
Abstract
Coulomb excitation of the exotic neutron-rich nucleus (26)Ne on a (208)Pb target was measured at 58 MeV/u in order to search for low-lying E1 strength above the neutron emission threshold. This radioactive beam experiment was carried out at the RIKEN Accelerator Research Facility. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV excitation energy. By performing a multipole decomposition of the differential cross section, a reduced dipole transition probability of B(E1)=0.49+/-0.16e(2) fm(2) is deduced, corresponding to 4.9+/-1.6% of the Thomas-Reiche-Kuhn sum rule. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is measured. The extracted decay pattern is not consistent with several mean-field theory descriptions of the pygmy states.
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Affiliation(s)
- J Gibelin
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris Sud, F-91406 Orsay, France.
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Kagawa Y, Dever GJ, Otto CTY, Charupoonphol P, Supannatas S, Yanagisawa Y, Sakuma M, Hasegawa K. Single nucleotide polymorphism and lifestyle-related diseases in the Asia-Pacific region: comparative study in Okinawa, Palau and Thailand. Asia Pac J Public Health 2008; 15 Suppl:S10-4. [PMID: 18924534 DOI: 10.1177/101053950301500s04] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Genetic differences between Asians and Caucasians may be involved in the rapid increase in lifestyle-related diseases in the Asia-Pacific region that has coincided with Westernisation of diets in the region. In the present study, we assessed correlation between 10 single nucleotide polymorphisms (SNPs) and chronic disease risk factors in age-matched and population-based groups in four Asian-Pacific locations: Okinawa, Palau and Thailand (two areas). The following allelic SNP profiles significantly differed (p<0.01) among the four populations, in both men and women: uncoupling protein 2 (UCP2), uncoupling protein 3 promoter (UCP3p), leptin receptor (LEPR) exon 6, and angiotensinogen (AGTa-20c). Multiple regression analyses showed significant associations between SNPs and clinical data. For men, these associations were between beta3 adrenergic receptor (beta3AR) and diastolic blood pressure (DBP) (p<0.01), UCP3p and total cholesterol (p<0.01), UCP2 and age (p<0.05), and AGTa-20c and age (p<0.01). For women, these associations were between LEPR exon 14 and body mass index (BMI) (p<0.05), UCP2 and systolic blood pressure (p<0.05), UCP3p and DBP (p<0.05), UCP2 and DBP (p<0.01), apolipoprotein E (ApoE)nd total cholesterol (p<0.01), beta3AR and triglyceride (p<0.05), AGTa-20c and triglyceride (p<0.05), and UCP2 and age (p<0.05). These results illustrate the interrelationships among SNPs and risk factors in the Asia-Pacific including China and Japan.
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Affiliation(s)
- Y Kagawa
- High Technology Centre, Department of Medical Chemistry and Nutrition Clinic, Kagawa Nutrition University, Chiyoda Sakado, Saitama 350-0288, Japan.
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Yanagisawa Y, Takeoka M, Ehara T, Itano N, Miyagawa S, Taniguchi S. Reduction of Calponin h1 expression in human colon cancer blood vessels. Eur J Surg Oncol 2008; 34:531-7. [PMID: 17707120 DOI: 10.1016/j.ejso.2007.05.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2007] [Accepted: 05/21/2007] [Indexed: 11/26/2022]
Abstract
AIMS Calponin h1 (CN) is a differentiation marker of smooth muscle cells that has been reported to be down-regulated in the blood vessels of several human tumors. In this study, we examined CN expression in blood vessels in relation to the clinical and pathological features of colon cancer tissue samples. METHODS Fifty-six patients who had undergone colectomy for colon cancer were examined. To assess patients' disease-free survival, those who had metastasis at the time of surgical operation were excluded. Immunohistochemistry was performed by the indirect immunoperoxidase method, using serial sections made from formalin fixed and paraffin embedded tissue blocks. RESULTS We found that the expression of vascular CN in the peripheral region of colon cancer tissues was significantly reduced in association with tumor progression, lymphatic invasion, vascular invasion and recurrence. This reduction of CN indicated not only a decrease of pericytes and/or smooth muscle cells in tumor vessels, but also the immaturity of those cells, since CN down-regulation occurred even in alpha-smooth muscle actin-positive cells. The down-regulation of CN in vessels in the peripheral region of tumor tissues was inversely associated with the expression of VEGF (vascular endothelial growth factor), seemingly advantageous to angiogenesis. CONCLUSION The down-regulation of CN expression in colon cancer vasculature evaluated by immunohistochemistry may be useful in conjunction with conventional staging procedures to predict more reliable outcome and to select therapeutic treatment.
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Affiliation(s)
- Y Yanagisawa
- Department of Molecular Oncology, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
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Ushida N, Fuchi H, Hoshino K, Kuramata S, Niu K, Niwa K, Shibuya H, Tasaka S, Yanagisawa Y, Maeda Y, Kimura H. Erratum to: Observation of a pair decay of short-lived neutral particles produced in 400 GeV/c proton interactions. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/bf02776282] [Citation(s) in RCA: 12] [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: 10/22/2022]
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32
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Elekes Z, Dombrádi Z, Aoi N, Bishop S, Fülöp Z, Gibelin J, Gomi T, Hashimoto Y, Imai N, Iwasa N, Iwasaki H, Kalinka G, Kondo Y, Korsheninnikov AA, Kurita K, Kurokawa M, Matsui N, Motobayashi T, Nakamura T, Nakao T, Nikolskii EY, Ohnishi TK, Okumura T, Ota S, Perera A, Saito A, Sakurai H, Satou Y, Sohler D, Sumikama T, Suzuki D, Suzuki M, Takeda H, Takeuchi S, Togano Y, Yanagisawa Y. Spectroscopic study of neutron shell closures via nucleon transfer in the near-dripline nucleus 23O. Phys Rev Lett 2007; 98:102502. [PMID: 17358526 DOI: 10.1103/physrevlett.98.102502] [Citation(s) in RCA: 2] [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: 11/30/2006] [Indexed: 05/14/2023]
Abstract
Neutron single particle energies have been measured in 23O using the 22O(d,p)23O*-->22O+n process. The energies of the resonant states have been deduced to be 4.00(2) MeV and 5.30(4) MeV. The first excited state can be assigned to the nu d3/2 single particle state from a comparison with shell model calculations. The measured 4.0 MeV energy difference between the nu s1/2 and nu d3/2 states gives the size of the N=16 shell gap which is in agreement with the recent USD05 ("universal" sd from 2005) shell model calculation, and is large enough to explain the unbound nature of the oxygen isotopes heavier than A=24. The resonance detected at 5.3 MeV can be assigned to a state out of the sd shell model space. Its energy corresponds to a approximately 1.3 MeV sized N=20 shell gap, therefore, the N=20 shell closure disappears at Z=8 in agreement with Monte Carlo shell model calculations using SDPF-M interaction.
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Affiliation(s)
- Z Elekes
- Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
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Nakamura T, Vinodkumar AM, Sugimoto T, Aoi N, Baba H, Bazin D, Fukuda N, Gomi T, Hasegawa H, Imai N, Ishihara M, Kobayashi T, Kondo Y, Kubo T, Miura M, Motobayashi T, Otsu H, Saito A, Sakurai H, Shimoura S, Watanabe K, Watanabe YX, Yakushiji T, Yanagisawa Y, Yoneda K. Observation of strong low-lying E1 strength in the two-neutron halo nucleus 11Li. Phys Rev Lett 2006; 96:252502. [PMID: 16907299 DOI: 10.1103/physrevlett.96.252502] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2006] [Indexed: 05/11/2023]
Abstract
An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus 11Li at 70 MeV/nucleon at RIKEN. Strong low-energy (soft) E1 excitation is observed, peaked at about Ex = 0.6 MeV with B(E1) = 1.42(18) e2fm2 for Erel < or = 3 MeV, which was largely missed in previous measurements. This excitation represents the strongest E1 transition ever observed at such low excitation energies. The spectrum is reproduced well by a three-body model with a strong two-neutron correlation, which is further supported by the E1 non-energy-weighted cluster sum rule.
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Affiliation(s)
- T Nakamura
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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34
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Yanagisawa Y, Sato Y, Asahi-Ozaki Y, Ito E, Honma R, Imai J, Kanno T, Kano M, Akiyama H, Sata T, Shinkai-Ouchi F, Yamakawa Y, Watanabe S, Katano H. Effusion and solid lymphomas have distinctive gene and protein expression profiles in an animal model of primary effusion lymphoma. J Pathol 2006; 209:464-73. [PMID: 16741895 DOI: 10.1002/path.2012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Lymphoma usually forms solid tumours in patients, and high expression levels of adhesion molecules are observed in these tumours. However, Kaposi's sarcoma-associated herpesvirus (KSHV)-related primary effusion lymphoma (PEL) does not form solid tumours and adhesion molecule expression is suppressed in the cells. Inoculation of a KSHV-associated PEL cell line into the peritoneal cavity of severe combined immunodeficiency mice resulted in the formation of effusion and solid lymphomas in the peritoneal cavity. Proteomics using two-dimensional difference gel electrophoresis and DNA microarray analyses identified 14 proteins and 105 genes, respectively, whose expression differed significantly between effusion and solid lymphomas. Five genes were identified as having similar expression profiles to that of lymphocyte function-associated antigen 1, an important adhesion molecule in leukocytes. Among these, coronin 1A, an actin-binding protein, was identified as a molecule showing high expression in solid lymphoma by both DNA microarray and proteomics analyses. Western and northern blotting showed that coronin 1A was predominantly expressed in solid lymphomas. Moreover, KSHV-encoded lytic proteins, including viral interleukin-6, were highly expressed in effusion lymphoma compared with solid lymphoma. These data demonstrate that effusion and solid lymphomas possess distinctive gene and protein expression profiles in our mouse model, and suggest that differences in gene and protein expression between effusion and solid lymphomas may be associated with the formation of effusion lymphoma or invasive features of solid lymphoma. Furthermore, the results obtained using this combination of proteomics and DNA microarray analyses indicate that protein synthesis partly reflects, but does not correlate strictly with, mRNA production.
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MESH Headings
- Acquired Immunodeficiency Syndrome/virology
- Animals
- Cell Line, Tumor
- DNA, Viral/analysis
- Electrophoresis, Gel, Two-Dimensional
- Gene Expression Profiling
- Gene Expression Regulation, Viral
- Herpesvirus 8, Human
- Humans
- Lymphocyte Function-Associated Antigen-1/genetics
- Lymphoma, AIDS-Related/genetics
- Mice
- Mice, SCID
- Models, Animal
- Oligonucleotide Array Sequence Analysis
- Pleural Effusion, Malignant/metabolism
- Pleural Effusion, Malignant/virology
- Proteomics
- Reverse Transcriptase Polymerase Chain Reaction
- Sarcoma, Kaposi/genetics
- Viral Proteins/analysis
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Affiliation(s)
- Y Yanagisawa
- Department of Clinical Informatics, Tokyo Medical and Dental University, Japan
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35
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Dombrádi Z, Elekes Z, Saito A, Aoi N, Baba H, Demichi K, Fülöp Z, Gibelin J, Gomi T, Hasegawa H, Imai N, Ishihara M, Iwasaki H, Kanno S, Kawai S, Kishida T, Kubo T, Kurita K, Matsuyama Y, Michimasa S, Minemura T, Motobayashi T, Notani M, Ohnishi T, Ong HJ, Ota S, Ozawa A, Sakai HK, Sakurai H, Shimoura S, Takeshita E, Takeuchi S, Tamaki M, Togano Y, Yamada K, Yanagisawa Y, Yoneda K. Vanishing N = 20 shell gap: study of excited states in (27,28)Ne. Phys Rev Lett 2006; 96:182501. [PMID: 16712361 DOI: 10.1103/physrevlett.96.182501] [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: 07/13/2005] [Indexed: 05/09/2023]
Abstract
This Letter reports on the (1)H((28)Ne, (28)Ne) and (1)H((28)Ne, (27)Ne) reactions studied at intermediate energy using a liquid hydrogen target. From the cross section populating the first 2(+) excited state of (28)Ne, and using the previously determined BE(2) value, the neutron quadrupole transition matrix element has been calculated to be M(n)=13.8 +/- 3.7 fm(2). In the neutron knockout reaction, two low-lying excited states were populated in (27)Ne. Only one of them can be interpreted by the sd shell model while the additional state may intrude from the fp shell. These experimental observations are consistent with the presence of fp shell configurations at low excitation energy in (27,28)Ne nuclei caused by a vanishing N=20 shell gap at Z=10.
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Affiliation(s)
- Zs Dombrádi
- Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, Debrecen, H-4001, Hungary
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36
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Yanagisawa Y, Iwamoto S, Kawabata T, Nakamura Y, Charupoonphol P, Supannatas S, Sone H, Kaneko Y, Watanabe S, Komatsu F, Sakuma M, Miyagi S, Hasegawa K, Kagawa Y. Leptin resistance conferred by a combination of single nucleotide polymorphism and the adoption of a Western lifestyle in urban areas of Thailand. J Nutr Health Aging 2006; 10:176-82. [PMID: 16622580] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
OBJECTIVES An increasing number of lifestyle disorders have emerged in response to the rapid urbanization that has occurred in Thailand. Recently, leptin resistance has been nominated as a possible marker for the onset of metabolic disorders in Asian countries. The research aimed to assess the relationship between leptin-resistance and environmental and/or genetic factors by comparing urban and rural inhabitants in Thailand. METHODS A total of 212 age- and sex-matched subjects from an urban area (Bangkok) and from rural areas (Sai Noi) participated in the study. Anthropometric measurements, blood biochemistry, single nucleotide polymorphism analyses, and interviews concerning lifestyles and dietary habits were conducted individually. Backward elimination multiple regression analyses and least trimmed sum of square methods were used to estimate the effects of possible factors. RESULTS A transition of staple food from rice to bread (decreased rice intake; p < 0.01 and increased bread intake; p < 0.05) was significant in urban areas. Leptin levels were higher in urban groups, with a significant difference in women (p < 0.001 in women and p = 0.06 in men), but not in men. Predictors selected for leptin-resistance in women were genotypes of UCP2, PPARg2, bread intake, living area, and smoking habit (r = 0.510); in men, genotypes of UCP2 and UCP3p, smoking habit, and rice intake (r = 0.315). CONCLUSIONS Urban women with del/del type of UCP2 exhibited significant leptin resistance. A combination of urbanization and UCP2 genotype were considered to be responsible.
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Affiliation(s)
- Y Yanagisawa
- Division of Human Genetics, Jichi Medical School, Yakushiji 3311-1, Minamikawachi-machi, Kawachi-gun, Tochigi 329-0498, Japan.
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Yanagisawa Y, Takaoka K, Yamabe S, Ito T. Interaction of CO2 with Magnesium Oxide Surfaces: a TPD, FTIR, and Cluster-Model Calculation Study. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100011a043] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [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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38
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Takao KI, Sasaki T, Kozaki T, Yanagisawa Y, Tadano KI, Kawashima A, Shinonaga H. Syntheses and absolute stereochemistries of UPA0043 and UPA0044, cytotoxic antibiotics having a p-quinone-methide structure. Org Lett 2001; 3:4291-4. [PMID: 11784200 DOI: 10.1021/ol016960n] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first syntheses of new antibiotics UPA0043 and UPA0044 were accomplished starting from commercially available 18beta-glycyrrhetinic acid and vanillin. The present syntheses involve the coupling of a sesquiterpenoid aldehyde and an aryllithium, the stereoselective formation of a p-quinone-methide system, and regioselective intramolecular cyclization via an epoxy ring opening. [reaction: see text]
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Affiliation(s)
- K I Takao
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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39
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Nakajima T, Akiyama Y, Shiraishi J, Arai T, Yanagisawa Y, Ara M, Fukuda Y, Sawabe M, Saitoh K, Kamiyama R, Hirokawa K, Yuasa Y. Age-related hypermethylation of the hMLH1 promoter in gastric cancers. Int J Cancer 2001; 94:208-11. [PMID: 11668499 DOI: 10.1002/ijc.1454] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
To determine whether methylation of the hMLH1 promoter is related to increasing age and gastric carcinogenesis, we examined hMLH1 methylation and expression in 100 gastric cancers. hMLH1 methylation and aberrant protein expression were observed in 9 and 13 cancers, respectively. Normal and intestinal metaplastic tissues adjacent to cancers with hypermethylation did not exhibit any hMLH1 methylation, indicating that it may be specific to gastric cancers. The frequency of hMLH1 methylation significantly increased with age. These results suggest that hMLH1 methylation plays an important role in gastric carcinogenesis in old people.
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Affiliation(s)
- T Nakajima
- Department of Molecular Oncology, Tokyo Medical and Dental University, Tokyo, Japan
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40
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Hadano S, Hand CK, Osuga H, Yanagisawa Y, Otomo A, Devon RS, Miyamoto N, Showguchi-Miyata J, Okada Y, Singaraja R, Figlewicz DA, Kwiatkowski T, Hosler BA, Sagie T, Skaug J, Nasir J, Brown RH, Scherer SW, Rouleau GA, Hayden MR, Ikeda JE. A gene encoding a putative GTPase regulator is mutated in familial amyotrophic lateral sclerosis 2. Nat Genet 2001. [PMID: 11586298 DOI: 10.1038/ng1001--166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Amyotrophic lateral sclerosis 2 (ALS2) is an autosomal recessive form of juvenile ALS and has been mapped to human chromosome 2q33. Here we report the identification of two independent deletion mutations linked to ALS2 in the coding exons of the new gene ALS2. These deletion mutations result in frameshifts that generate premature stop codons. ALS2 is expressed in various tissues and cells, including neurons throughout the brain and spinal cord, and encodes a protein containing multiple domains that have homology to RanGEF as well as RhoGEF. Deletion mutations are predicted to cause a loss of protein function, providing strong evidence that ALS2 is the causative gene underlying this form of ALS.
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Affiliation(s)
- S Hadano
- NeuroGenes, International Cooperative Research Project, Japan
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Hadano S, Hand CK, Osuga H, Yanagisawa Y, Otomo A, Devon RS, Miyamoto N, Showguchi-Miyata J, Okada Y, Singaraja R, Figlewicz DA, Kwiatkowski T, Hosler BA, Sagie T, Skaug J, Nasir J, Brown RH, Scherer SW, Rouleau GA, Hayden MR, Ikeda JE. A gene encoding a putative GTPase regulator is mutated in familial amyotrophic lateral sclerosis 2. Nat Genet 2001; 29:166-73. [PMID: 11586298 DOI: 10.1038/ng1001-166] [Citation(s) in RCA: 459] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Amyotrophic lateral sclerosis 2 (ALS2) is an autosomal recessive form of juvenile ALS and has been mapped to human chromosome 2q33. Here we report the identification of two independent deletion mutations linked to ALS2 in the coding exons of the new gene ALS2. These deletion mutations result in frameshifts that generate premature stop codons. ALS2 is expressed in various tissues and cells, including neurons throughout the brain and spinal cord, and encodes a protein containing multiple domains that have homology to RanGEF as well as RhoGEF. Deletion mutations are predicted to cause a loss of protein function, providing strong evidence that ALS2 is the causative gene underlying this form of ALS.
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Affiliation(s)
- S Hadano
- NeuroGenes, International Cooperative Research Project, Japan
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Abstract
Recent research has demonstrated that nitrous acid (HONO) is produced in indoor environments by NO2 reacting with interior surfaces, and is also emitted directly by some combustion sources. We have recently characterized the interference by HONO to NO2 measurements made by several commonly used continuous NO2 monitors. This paper reports on the effect of HONO on NO2 measurements made by passive sampling devices. The objective of this study was to evaluate this interference, and the accuracy and precision of passive samplers used for indoor NO2 measurements. We report that HONO interferes quantitatively with three of the four NO2 passive samplers tested.
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Affiliation(s)
- C W Spicer
- Atmospheric Science and Applied Technology Department, Battelle, 505 King Avenue, Colombus, Ohio 43201, USA.
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Abstract
The aim of this study was to assess the performance of a method of analyzing organic esters of plasticizer in indoor air by sampling air in a charcoal tube and extracting the esters in toluene using a gas chromatography-mass spectrometer (GC-MS) and flame photometric detector (FPD). An internal standardization method was used for the GC-MS measurement of phthalate esters, whereas an external calibration method was employed to determine the levels of phosphate esters by FPD. The instrumental detection limit, the instrumental lower limit of determination, and the blank and method detection limits were also determined. Mean recoveries of phthalate esters from the charcoal tube were 97.9-115%. Mean recoveries of phosphate esters were lower but reproducible. Recoveries of the esters from indoor air were generally greater than 80%. For all the compounds, no significant breakthrough was detected up to 100 microg. Thus, indoor organic esters could be accurately determined in the range of 0.6 x 10(-3)-23 microg/m3 by the procedure presented here. Preliminary analysis of the organic esters indicated that exposure to phthalate esters via indoor air inhalation could constitute a significant contribution to total daily intake.
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Affiliation(s)
- T Otake
- Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Japan
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Kitami CE, Shimizu T, Sato O, Kurosaki I, Mori S, Yanagisawa Y, Ajioka Y, Hatakeyama K. Malignant islet cell tumor projecting into the main pancreatic duct. J Hepatobiliary Pancreat Surg 2001; 7:529-33. [PMID: 11180883 DOI: 10.1007/s005340070027] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2000] [Accepted: 07/12/2000] [Indexed: 10/27/2022]
Abstract
We report herein a rare case of islet cell tumor showing a unique growth pattern in a patient who developed repeated acute pancreatitis as the tumor's initial symptom. Preoperative imaging examinations showed dilatation of the main pancreatic duct (MPD) and cysts around the pancreatic tail. A distal pancreatectomy with splenectomy was performed because the pancreatitis was localized in the distal pancreas and was not controlled by various drug therapies. Grossly, the tumor consisted of two component parts: a markedly infiltrative part in the pancreatic parenchyma, and a papillary elevated part in the MPD. The MPD was obstructed by the tumor spreading widely along the distal MPD. Microscopically, the tumor was composed entirely of islet cell tumors (nonfunctioning), with several foci of venous and lymphatic involvement. Based on its growth behavior, we assumed that the tumor may have arisen from the MPD or from islet cells closely adjacent to the MPD. The patient's postoperative course was uneventful and he is doing well 2 years after the operation. We discuss the growth pattern of the tumor and the cause of the pancreatitis.
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Affiliation(s)
- C E Kitami
- Department of Surgery, Shinraku-en Hospital, Niigata, Japan
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Yanagisawa Y, Hasegawa K, Dever GJ, Otto CT, Sakuma M, Shibata S, Miyagi S, Kaneko Y, Kagawa Y. Uncoupling protein 3 and peroxisome proliferator-activated receptor gamma2 contribute to obesity and diabetes in palauans. Biochem Biophys Res Commun 2001; 281:772-8. [PMID: 11237725 DOI: 10.1006/bbrc.2001.4417] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We examined the genetic contribution of single nucleotide polymorphisms (SNPs) of the energy metabolism-related genes, including beta 3 adrenergic receptor (beta3AR), apolipoprotein E (apo-E), promoter of uncoupling protein 3 (UCP3-p), peroxisome proliferator-activated receptor gamma 2 (PPARgamma2) and leptin receptor (LEPR) to metabolic disorders, in 118 inhabitants of Palau. The data were statistically analyzed and ethnically compared to correlate SNPs and their metabolic parameters. UCP3-p (P < 0.01) and PPARgamma2 (p = 0.05) correlated with plasma HbA1c, and UCP3-p correlated with fasting blood glucose (P < 0.01) in males, but not in females. UCP3-p correlated with body fat (%) (P < 0.01) in females, but not in males. Plasma leptin levels and apo-E were correlated in both groups. The frequency of SNPs for PPARgamma2, LEPR, and UCP3-p are significantly different between Palauans and Caucasians.
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Affiliation(s)
- Y Yanagisawa
- Department of Medical Chemistry, Kagawa Nutrition University, Chiyoda Sakado, Saitama, 350-0288, Japan
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Hadano S, Yanagisawa Y, Skaug J, Fichter K, Nasir J, Martindale D, Koop BF, Scherer SW, Nicholson DW, Rouleau GA, Ikeda J, Hayden MR. Cloning and characterization of three novel genes, ALS2CR1, ALS2CR2, and ALS2CR3, in the juvenile amyotrophic lateral sclerosis (ALS2) critical region at chromosome 2q33-q34: candidate genes for ALS2. Genomics 2001; 71:200-13. [PMID: 11161814 DOI: 10.1006/geno.2000.6392] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Amyotrophic lateral sclerosis is a progressive neurodegenerative disease that manifests as selective upper and lower motor neuron degeneration. The autosomal recessive form of juvenile amyotrophic lateral sclerosis (ALS2) has previously been mapped to the 1.7-cM interval flanked by D2S116 and D2S2237 on human chromosome 2q33-q34. We identified three novel full-length transcripts encoded by three distinct genes (HGMW-approved symbols ALS2CR1, ALS2CR2, and ALS2CR3) within the ALS2 critical region. The intron-exon organizations of these genes as well as those of CFLAR, CASP10, and CASP8, which were previously mapped to this region, were defined. These genes were evaluated for mutations in ALS2 patients, and no disease-associated sequence alterations in either exons or intron-exon boundaries were observed. Sequence analysis of overlapping RT-PCR products covering the whole coding sequence for each transcript revealed no aberrant mRNA sequences. These data strongly indicate that ALS2CR1, ALS2CR2, ALS2CR3, CFLAR, CASP10, and CASP8 are not causative genes for ALS2.
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Affiliation(s)
- S Hadano
- NeuroGenes, International Cooperative Research Project, Japan Science and Technology Corporation, Isehara, 259-1193, Japan
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Lung SC, Yanagisawa Y, Ford TE, Spengler JD. Characteristics of sorption losses of polychlorinated biphenyl congeners onto glass surfaces. Chemosphere 2000; 41:1857-1864. [PMID: 11061307 DOI: 10.1016/s0045-6535(00)00082-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Sorption losses to glass surfaces of five polychlorinated biphenyl (PCB) congeners in aqueous solutions were investigated. Adsorption/desorption experiments were conducted under conditions that simulated actual sample handling procedures for environmental samples. It was found that the adsorption loss is related to the degree of chlorination. PCB congener 180 lost the most onto glass surfaces, followed by congeners 138, 101/28, and 52, in decreasing order. More PCB adsorption occurred onto glass under conditions of agitation and higher temperature (22 degrees C) during the five-day experimental period. The salinity effect ("salting out effect") was also observed in this work. The efficiency of desorption (rinsing three times with solvent) was found to be ineffective in extracting adsorbed PCBs. It was necessary to use mechanical shaking for extraction. Storage of samples up to five days resulted in sorption losses as much as 30%, 17%, 30%, 40%, and 55% of PCB 28, 52, 101, 138, and 180, respectively. Sorption losses need to be considered when conducting water sampling or toxicological studies to avoid underestimation of the actual PCB concentrations and their toxic effects.
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Affiliation(s)
- S C Lung
- Department of Public Health, Chung Shan Medical and Dental College,Taichung, Taiwan, ROC.
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Abstract
The association equilibria for complex formation between serum albumin (bovine, rat) and the optical isomers of methamphetamine (MAMP) was determined using an ultrafiltration method. It was found that serum albumin/d-MAMP and serum albumin/l-MAMP complexes had distinctly different Scatchard plots with bovine and rat albumin. The binding parameters of each association equilibrium were estimated from the Scatchard plots by Rosenthal's graphic method. This distinguished two kinds of specific binding sites in terms of the association equilibrium between bovine serum albumin and d-MAMP, and one binding site for rat serum albumin and d-MAMP. One specific binding site was found between serum albumin and l-MAMP in both bovine and rat. Molar ellipticities, [theta], of peaks were decreased in the CD spectra of the complexes formed between bovine serum albumin and d-MAMP or l-MAMP when compared with the CD spectrum of bovine serum albumin alone. However, no difference in [theta] was found between the CD spectra of the enantiomers of MAMP in the measured wavelength range. The non-specific binding site was distinct from the specific binding site and resulting from altered tertiary structure of the albumin molecule.
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Affiliation(s)
- Y Yanagisawa
- Department of Forensic Science, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
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Nagai T, Matsushima K, Nagai T, Yanagisawa Y, Fujita A, Kurosu A, Tokudome S. Interpretation and enantiomer analysis of methamphetamine abusers' urine and illegally brewed methamphetamine crystals. J Anal Toxicol 2000; 24:140-5. [PMID: 10732953 DOI: 10.1093/jat/24.2.140] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study deals with the high-performance liquid chromatographic identification of methamphetamine (MAMP) and amphetamine (AMP) enantiomers (d- and l-forms) in five illicit MAMP crystals and in urine specimens from 30 Japanese MAMP abusers. The analysis revealed that two of the types of crystals have a different optical purity ratio (l/d) and the other three have a single crystal of either the d- or l-enantiomer. The l/d ratios of two types of crystals were 0.04 and 49.4, and no racemic form (l/d = 1.00) was found. The urinary analysis showed that nonmetabolized MAMP and its demethylated metabolite, AMP, were present in urine specimens of all addicts. The stereoisomeric profiles in urine can be classified roughly into five groups according to the detected amount and the l/d ratio of MAMP and AMP enantiomers collected at one time point. In the first group, only d-MAMP and d-AMP were detected (in 16 cases). In the second group, only l-MAMP and l-AMP were detected (in one case). In the third group, the amount of the l-enantiomer detected, for both MAMP and AMP, was less than that of the d-enantiomer, and the l/d ratio was between 0.004 and 0.54 for MAMP and between 0.01 and 0.07 for AMP (in five cases). In the fourth group, the l-enantiomer of MAMP and AMP was found to be more abundant than the d-enantiomer, and the l/d ratio was between 2.63 and 30.11 for MAMP and between 1.23 and 31.30 for AMP (in four cases). In the fifth group, the amount of l-MAMP detected was greater than that of d-MAMP, and less l-AMP than d-AMP was detected. The l/d ratios were between 1.13 and 8.82 for MAMP and between 0.17 and 0.82 for AMP (in four cases). These results might be suitable for identification and the forensic toxicological investigation of AMP analogues.
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Affiliation(s)
- T Nagai
- Department of Legal Medicine, Dokkyo University of School of Medicine, Tochigi, Japan
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Yanagisawa Y, Akiyama Y, Iida S, Ito E, Nomizu T, Sugihara K, Yuasa Y, Maruyama K. Methylation of the hMLH1 promoter in familial gastric cancer with microsatellite instability. Int J Cancer 2000. [PMID: 10585582 DOI: 10.1002/(sici)1097-0215(20000101)85: 1<50: : aid-ijc9>3.0.co; 2-e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Microsatellite instability (MSI), which is recognized as an important mechanism in tumorigenesis, has been reported in familial gastric cancers (FGC). However, genetic defects responsible for this phenotype, that is, mutations in mismatch-repair genes such as hMLH1 and hMSH2, have not been detected in most FGC cases. Earlier studies have shown that the promoter region of the hMLH1 gene was methylated in some sporadic colorectal and endometrial cancers. To determine how FGC acquire MSI, we examined the MSI status, hMLH1-protein expression and methylation status of the hMLH1-promoter region in FGC cases. Out of 9 cancers, 6 from 8 FGC kindreds showed MSI at one or more loci; no germline mutations in the hMLH1 or hMSH2 genes were detected; 4 cancers exhibiting MSI displayed aberrant hMLH1 expression: complete loss in one, decreased level in another, and partially staining pattern in the remaining 2. Methylation in the hMLH1-promoter region was found in these 4 cases. In contrast, the cancers displaying hMLH1-protein expression were not methylated in the hMLH1-promoter region. Our data show a significant association between the absence of hMLH1 expression and methylation of its promoter in FGC cases with MSI. This suggests that the mechanism of inactivation of hMLH1 is epigenetic and that there are other genes responsible for FGC.
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Affiliation(s)
- Y Yanagisawa
- Department of Hygiene and Oncology, Tokyo Medical and Dental University School of Medicine, Tokyo, Japan
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