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Boulay F, Simpson GS, Ichikawa Y, Kisyov S, Bucurescu D, Takamine A, Ahn DS, Asahi K, Baba H, Balabanski DL, Egami T, Fujita T, Fukuda N, Funayama C, Furukawa T, Georgiev G, Gladkov A, Hass M, Imamura K, Inabe N, Ishibashi Y, Kawaguchi T, Kawamura T, Kim W, Kobayashi Y, Kojima S, Kusoglu A, Lozeva R, Momiyama S, Mukul I, Niikura M, Nishibata H, Nishizaka T, Odahara A, Ohtomo Y, Ralet D, Sato T, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tao LC, Togano Y, Tominaga D, Ueno H, Yamazaki H, Yang XF, Daugas JM. Boulay et al. Reply. Phys Rev Lett 2021; 127:169202. [PMID: 34723612 DOI: 10.1103/physrevlett.127.169202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Affiliation(s)
- F Boulay
- CEA, DAM, DIF, 91297 Arpajon cedex, France
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- GANIL, CEA/DSM-CNRS/IN2P3, BP55027, 14076 Caen cedex 5, France
| | - G S Simpson
- LPSC, CNRS/IN2P3, Université Joseph Fourier Grenoble 1, INPG, 38026 Grenoble Cedex, France
| | - Y Ichikawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kisyov
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - D Bucurescu
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - A Takamine
- RIKEN Nishina Center for Accelerator-Based Science, 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
| | - K Asahi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D L Balabanski
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - T Egami
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - T Fujita
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C Funayama
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - T Furukawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan
| | - G Georgiev
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - A Gladkov
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea
| | - M Hass
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - K Imamura
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa 214-8571, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Ishibashi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-5877, Japan
| | - T Kawaguchi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - T Kawamura
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - W Kim
- Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea
| | - Y Kobayashi
- Department of Informatics and Engineering, University of Electro-Communication, 1-5-1 Chofugaoka, Chohu, Tokyo 182-8585, Japan
| | - S Kojima
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - A Kusoglu
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
- Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Faith, 34134 Istanbul, Turkey
| | - R Lozeva
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - S Momiyama
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - I Mukul
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Nishibata
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - T Nishizaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - Y Ohtomo
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - D Ralet
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - T Sato
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 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
| | - L C Tao
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y Togano
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - D Tominaga
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Yamazaki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - X F Yang
- Instituut voor Kern-en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - J M Daugas
- CEA, DAM, DIF, 91297 Arpajon cedex, France
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Dmowski W, Yoo GH, Gierlotka S, Wang H, Yokoyama Y, Park ES, Stelmakh S, Egami T. High Pressure Quenched Glasses: unique structures and properties. Sci Rep 2020; 10:9497. [PMID: 32528160 PMCID: PMC7289830 DOI: 10.1038/s41598-020-66418-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 05/20/2020] [Indexed: 11/27/2022] Open
Abstract
Zr-based metallic glasses are prepared by quenching supercooled liquid under pressure. These glasses are stable in ambient conditions after decompression. The High Pressure Quenched glasses have a distinct structure and properties. The pair distribution function shows redistribution of the Zr-Zr interatomic distances and their shift towards smaller values. These glasses exhibit higher density, hardness, elastic modulus, and yield stress. Upon heating at ambient pressure, they show volume expansion and distinct relaxation behavior, reaching an equilibrated state above the glass transition. These experimental results are consistent with an idea of pressure-induced low to high density liquid transition in the supercooled melt.
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Affiliation(s)
- W Dmowski
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
| | - G H Yoo
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - S Gierlotka
- Institute of High Pressure Physics, Polish Academy of Science, Warsaw, Poland
| | - H Wang
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Y Yokoyama
- Materials Research Institute, Tohoku University, Sendai, Japan
| | - E S Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - S Stelmakh
- Institute of High Pressure Physics, Polish Academy of Science, Warsaw, Poland
| | - T Egami
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA.,Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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3
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Boulay F, Simpson GS, Ichikawa Y, Kisyov S, Bucurescu D, Takamine A, Ahn DS, Asahi K, Baba H, Balabanski DL, Egami T, Fujita T, Fukuda N, Funayama C, Furukawa T, Georgiev G, Gladkov A, Hass M, Imamura K, Inabe N, Ishibashi Y, Kawaguchi T, Kawamura T, Kim W, Kobayashi Y, Kojima S, Kusoglu A, Lozeva R, Momiyama S, Mukul I, Niikura M, Nishibata H, Nishizaka T, Odahara A, Ohtomo Y, Ralet D, Sato T, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tao LC, Togano Y, Tominaga D, Ueno H, Yamazaki H, Yang XF, Daugas JM. g Factor of the ^{99}Zr (7/2^{+}) Isomer: Monopole Evolution in the Shape-Coexisting Region. Phys Rev Lett 2020; 124:112501. [PMID: 32242689 DOI: 10.1103/physrevlett.124.112501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/28/2019] [Accepted: 12/17/2019] [Indexed: 06/11/2023]
Abstract
The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus ^{99}Zr was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J^{π}=7/2^{+}, with a half-life of T_{1/2}=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a ^{238}U primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μ_{N} was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd_{5/2} composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.
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Affiliation(s)
- F Boulay
- CEA, DAM, DIF, 91297 Arpajon cedex, France
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- GANIL, CEA/DSM-CNRS/IN2P3, BP55027, 14076 Caen cedex 5, France
| | - G S Simpson
- LPSC, CNRS/IN2P3, Université Joseph Fourier Grenoble 1, INPG, 38026 Grenoble Cedex, France
| | - Y Ichikawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kisyov
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - D Bucurescu
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - A Takamine
- RIKEN Nishina Center for Accelerator-Based Science, 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
| | - K Asahi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D L Balabanski
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - T Egami
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - T Fujita
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C Funayama
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - T Furukawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan
| | - G Georgiev
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - A Gladkov
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea
| | - M Hass
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - K Imamura
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa 214-8571, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Ishibashi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-5877, Japan
| | - T Kawaguchi
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - T Kawamura
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - W Kim
- Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, South Korea
| | - Y Kobayashi
- Department of Informatics and Engineering, University of Electro-Communication, 1-5-1 Chofugaoka, Chohu, Tokyo 182-8585, Japan
| | - S Kojima
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - A Kusoglu
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
- Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Faith, 34134 Istanbul, Turkey
| | - R Lozeva
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - S Momiyama
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - I Mukul
- Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - M Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Nishibata
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - T Nishizaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama 1-1 Toyonaka, Osaka 560-0034, Japan
| | - Y Ohtomo
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - D Ralet
- CSNSM, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Campus, France
| | - T Sato
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 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
| | - L C Tao
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y Togano
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
| | - D Tominaga
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Advanced Sciences, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Yamazaki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - X F Yang
- Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - J M Daugas
- CEA, DAM, DIF, 91297 Arpajon cedex, France
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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4
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Lobzenko I, Shiihara Y, Iwashita T, Egami T. Shear Softening in a Metallic Glass: First-Principles Local-Stress Analysis. Phys Rev Lett 2020; 124:085503. [PMID: 32167329 DOI: 10.1103/physrevlett.124.085503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
Metallic glasses deform elastically under stress. However, the atomic-level origin of elastic properties of metallic glasses remain unclear. In this Letter using ab initio molecular dynamics simulations of the Cu_{50}Zr_{50} metallic glass under shear strain, we show that the heterogeneous stress relaxation results in the increased charge transfer from Zr to Cu atoms, enhancing the softening of the shear modulus. Changes in compositional short-range order and atomic position shifts due to the nonaffine deformation are discussed. It is shown that the Zr subsystem exhibits a stiff behavior, whereas the displacements of Cu atoms from their initial positions, induced by the strain, provide the stress drop and softening.
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Affiliation(s)
- I Lobzenko
- Toyota Technological Institute, Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
| | - Y Shiihara
- Toyota Technological Institute, Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
| | - T Iwashita
- Department of Integrated Science and Technology, Oita University, Oita 870-1192, Japan
| | - T Egami
- University of Tennessee, Knoxville, Tennessee 37996, USA and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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5
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Ashcraft R, Wang Z, Abernathy DL, Quirinale DG, Egami T, Kelton KF. Experimental determination of the temperature-dependent Van Hove function in a Zr 80Pt 20 liquid. J Chem Phys 2020; 152:074506. [PMID: 32087649 DOI: 10.1063/1.5144256] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Even though the viscosity is one of the most fundamental properties of liquids, the connection with the atomic structure of the liquid has proven elusive. By combining inelastic neutron scattering with the electrostatic levitation technique, the time-dependent pair-distribution function (i.e., the Van Hove function) has been determined for liquid Zr80Pt20. We show that the decay time of the first peak of the Van Hove function is directly related to the Maxwell relaxation time of the liquid, which is proportional to the shear viscosity. This result demonstrates that the local dynamics for increasing or decreasing the coordination number of local clusters by one determines the viscosity at high temperature, supporting earlier predictions from molecular dynamics simulations.
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Affiliation(s)
- R Ashcraft
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
| | - Z Wang
- Department of Materials Science and Engineering, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D L Abernathy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D G Quirinale
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Egami
- Department of Materials Science and Engineering, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K F Kelton
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
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6
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Ryu CW, Dmowski W, Kelton KF, Lee GW, Park ES, Morris JR, Egami T. Curie-Weiss behavior of liquid structure and ideal glass state. Sci Rep 2019; 9:18579. [PMID: 31819088 PMCID: PMC6901545 DOI: 10.1038/s41598-019-54758-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 09/24/2019] [Accepted: 11/12/2019] [Indexed: 12/02/2022] Open
Abstract
We present the results of a structural study of metallic alloy liquids from high temperature through the glass transition. We use high energy X-ray scattering and electro-static levitation in combination with molecular dynamics simulation and show that the height of the first peak of the structure function, S(Q) - 1, follows the Curie-Weiss law. The structural coherence length is proportional to the height of the first peak, and we suggest that its increase with cooling may be related to the rapid increase in viscosity. The Curie temperature is negative, implying an analogy with spin-glass. The Curie-Weiss behavior provides a pathway to an ideal glass state, a state with long-range correlation without lattice periodicity, which is characterized by highly diverse local structures, reminiscent of spin-glass.
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Affiliation(s)
- C W Ryu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
- Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - W Dmowski
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - K F Kelton
- Department of Physics and Institute of Materials Science and Engineering, Washington University, St. Louis, MO, 63130, USA
| | - G W Lee
- Korea Research Institute of Standards and Science, Daejon, 34113, Republic of Korea
- Department of Nano Science, University of Science and Technology, Daejon, 34113, Republic of Korea
| | - E S Park
- Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - J R Morris
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Ames Laboratory, Ames, IA, 50011, USA
| | - T Egami
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
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7
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Novak E, Jalarvo N, Gupta S, Hong K, Förster S, Egami T, Ohl M. Dynamics in the Plastic Crystalline Phases of Cyclohexanol and Cyclooctanol Studied by Quasielastic Neutron Scattering. J Phys Chem B 2018; 122:6296-6304. [PMID: 29775540 DOI: 10.1021/acs.jpcb.8b03448] [Citation(s) in RCA: 1] [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: 11/28/2022]
Abstract
Plastic crystals are a promising candidate for solid state ionic conductors. In this work, quasielastic neutron scattering is employed to investigate the center of mass diffusive motions in two types of plastic crystalline cyclic alcohols: cyclohexanol and cyclooctanol. Two separate motions are observed which are attributed to long-range translational diffusion (α-process) and cage rattling (fast β-process). Residence times and diffusion coefficients are calculated for both processes, along with the confinement distances for the cage rattling. In addition, a binary mixture of these two materials is measured to understand how the dynamics change when a second type of molecule is added to the matrix. It is observed that, upon the addition of the larger cyclooctanol molecules into the cyclohexanol solution, the cage size decreases, which causes a decrease in the observed diffusion rates for both the α- and fast β-processes.
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Affiliation(s)
- E Novak
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Neutron Sciences Directorate , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - N Jalarvo
- Neutron Sciences Directorate , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - S Gupta
- Department of Chemistry and Macromolecular Studies Group , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - K Hong
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Department of Chemical and Biomolecular Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - S Förster
- Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - T Egami
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Materials Science and Technology Division , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Department of Physics and Astronomy , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - M Ohl
- Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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8
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Pramanick A, Dmowski W, Egami T, Budisuharto AS, Weyland F, Novak N, Christianson AD, Borreguero JM, Abernathy DL, Jørgensen MRV. Stabilization of Polar Nanoregions in Pb-free Ferroelectrics. Phys Rev Lett 2018; 120:207603. [PMID: 29864364 DOI: 10.1103/physrevlett.120.207603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 02/07/2018] [Indexed: 06/08/2023]
Abstract
The formation of polar nanoregions through solid-solution additions is known to enhance significantly the functional properties of ferroelectric materials. Despite considerable progress in characterizing the microscopic behavior of polar nanoregions (PNR), understanding their real-space atomic structure and dynamics of their formation remains a considerable challenge. Here, using the method of dynamic pair distribution function, we provide direct insights into the role of solid-solution additions towards the stabilization of polar nanoregions in the Pb-free ferroelectric of Ba(Zr,Ti)O_{3}. It is shown that for an optimum level of substitution of Ti by larger Zr ions, the dynamics of atomic displacements for ferroelectric polarization are slowed sufficiently below THz frequencies, which leads to increased local correlation among dipoles within PNRs. The dynamic pair distribution function technique demonstrates a unique capability to obtain insights into locally correlated atomic dynamics in disordered materials, including new Pb-free ferroelectrics, which is necessary to understand and control their functional properties.
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Affiliation(s)
- A Pramanick
- Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong SAR
| | - W Dmowski
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Oak Ridge, Tennessee 37831, USA
| | - T Egami
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Oak Ridge, Tennessee 37831, USA
| | - A Setiadi Budisuharto
- Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong SAR
| | - F Weyland
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
| | - N Novak
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
| | - A D Christianson
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J M Borreguero
- Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D L Abernathy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M R V Jørgensen
- Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark
- MAX IV Laboratory, Lund University, SE-221 00 Lund, Sweden
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9
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Ueki T, Manabe T, Inoue S, Ienaga J, Yamanaka N, Egami T, Ishikawa M, Konomi H, Ikubo A, Nagayoshi K, Nakamura M, Tanaka M. A Feasibility Study of Neoadjuvant XELOX Without Radiotherapy for Locally Advanced Lower Rectal Cancer. Anticancer Res 2016; 36:741-747. [PMID: 26851033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
AIM This study was planned to evaluate the efficacy and safety of preoperative capecitabine and oxaliplatin (XELOX) without radiation in patients with locally advanced lower rectal cancer. PATIENTS AND METHODS Patients with clinical stage II/III lower rectal cancer underwent three cycles of XELOX followed by radical surgery. The primary end-point was the R0 resection rate. RESULTS Thirty-one patients were recruited between February 2012 and August 2014. The completion rate of neoadjuvant chemotherapy was 96.5% among the 29 patients who received it; the remaining two refused chemotherapy and underwent immediate surgery. Grade 3-4 adverse events occurred in nine patients (31%). All 29 patients who received chemotherapy underwent radical resection. The R0 resection rate was 96.5% among these 29 patients. Pathological complete responses were achieved in three patients (10.3%) and downstaging occurred in 13 (44.8%). CONCLUSION This pilot study found that neoadjuvant XELOX for locally advanced lower rectal cancer is feasible and safe. This neoadjuvant treatment improved resection margin status.
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Affiliation(s)
- Takashi Ueki
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Tatsuya Manabe
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Shigetaka Inoue
- Japanese Red Cross Fukuoka Hospital, Minami-ku, Fukuoka, Japan
| | - Jun Ienaga
- Japanese Red Cross Fukuoka Hospital, Minami-ku, Fukuoka, Japan
| | - Naoki Yamanaka
- Japanese Red Cross Yamaguchi Hospital, Yamaguchi-shi, Yamaguchi, Japan
| | - Takuya Egami
- Japan Labor Health Welfare Organization, Kyushu Rosai Hospital, Kokuraminami-ku, Kitakyushu, Japan
| | - Mikimasa Ishikawa
- Japan Community Health Care Organization, Kyushu Hospital, Yahatanishi-ku, Kitakyushu, Japan
| | | | - Akashi Ikubo
- Japanese Red Cross Karatsu Hospital, Karatsu-shi, Saga, Japan
| | - Kinuko Nagayoshi
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Masafumi Nakamura
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Masao Tanaka
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Kyushu University, Higashi-ku, Fukuoka, Japan Shimonoseki City Hospital, Shimonoseki-shi, Yamaguchi, Japan
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10
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Mauro NA, Vogt AJ, Derendorf KS, Johnson ML, Rustan GE, Quirinale DG, Kreyssig A, Lokshin KA, Neuefeind JC, An K, Wang XL, Goldman AI, Egami T, Kelton KF. Electrostatic levitation facility optimized for neutron diffraction studies of high temperature liquids at a spallation neutron source. Rev Sci Instrum 2016; 87:013904. [PMID: 26827330 DOI: 10.1063/1.4939194] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 12/17/2015] [Indexed: 06/05/2023]
Abstract
Neutron diffraction studies of metallic liquids provide valuable information about inherent topological and chemical ordering on multiple length scales as well as insight into dynamical processes at the level of a few atoms. However, there exist very few facilities in the world that allow such studies to be made of reactive metallic liquids in a containerless environment, and these are designed for use at reactor-based neutron sources. We present an electrostatic levitation facility, NESL (for Neutron ElectroStatic Levitator), which takes advantage of the enhanced capabilities and increased neutron flux available at spallation neutron sources (SNSs). NESL enables high quality elastic and inelastic neutron scattering experiments to be made of reactive metallic and other liquids in the equilibrium and supercooled temperature regime. The apparatus is comprised of a high vacuum chamber, external and internal neutron collimation optics, and a sample exchange mechanism that allows up to 30 samples to be processed between chamber openings. Two heating lasers allow excellent sample temperature homogeneity, even for samples approaching 500 mg, and an automated temperature control system allows isothermal measurements to be conducted for times approaching 2 h in the liquid state, with variations in the average sample temperature of less than 0.5%. To demonstrate the capabilities of the facility for elastic scattering studies of liquids, a high quality total structure factor for Zr64Ni36 measured slightly above the liquidus temperature is presented from experiments conducted on the nanoscale-ordered materials diffractometer (NOMAD) beam line at the SNS after only 30 min of acquisition time for a small sample (∼100 mg).
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Affiliation(s)
- N A Mauro
- Department of Physics, North Central College, Naperville, Illinois 60540, USA
| | - A J Vogt
- Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K S Derendorf
- Mechanical Engineering and Materials Science, Washington University, St. Louis, Missouri 63130, USA
| | - M L Johnson
- Department of Physics and Institute of Materials Science and Engineering, Washington University, 1 Brookings Drive, St. Louis, Missouri 63130, USA
| | - G E Rustan
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - D G Quirinale
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A Kreyssig
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - K A Lokshin
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J C Neuefeind
- Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Ke An
- Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Xun-Li Wang
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Ave., Kowloon, Hong Kong
| | - A I Goldman
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - T Egami
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K F Kelton
- Department of Physics and Institute of Materials Science and Engineering, Washington University, 1 Brookings Drive, St. Louis, Missouri 63130, USA
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11
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Blodgett ME, Egami T, Nussinov Z, Kelton KF. Proposal for universality in the viscosity of metallic liquids. Sci Rep 2015; 5:13837. [PMID: 26350788 PMCID: PMC4563367 DOI: 10.1038/srep13837] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 08/07/2015] [Indexed: 11/29/2022] Open
Abstract
The range of magnitude of the liquid viscosity, η, as a function of temperature is one of the most impressive of any physical property, changing by approximately 17 orders of magnitude from its extrapolated value at infinite temperature (ηo) to that at the glass transition temperature, Tg. We present experimental measurements of containerlessly processed metallic liquids that suggest that log(η/ηo) as a function of TA/T is a potentially universal scaled curve. In stark contrast to previous approaches, the scaling requires only two fitting parameters, which are on average predictable. The temperature TA corresponds to the onset of cooperative motion and is strongly correlated with Tg, suggesting that the processes underlying the glass transition first appear in the high temperature liquid.
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Affiliation(s)
- M E Blodgett
- Department of Physics and Institute of Materials Science and Engineering, Washington University, St. Louis, MO 63130 USA
| | - T Egami
- Joint Institute for Neutron Sciences, University of Tennessee, Knoxville TN 37996 and Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
| | - Z Nussinov
- Department of Physics and Institute of Materials Science and Engineering, Washington University, St. Louis, MO 63130 USA
| | - K F Kelton
- Department of Physics and Institute of Materials Science and Engineering, Washington University, St. Louis, MO 63130 USA
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12
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Abstract
Modern materials are often complex in the structure at mesoscale. The method of pair-density function (PDF) is a powerful tool to characterize mesoscopic structure, bridging short- and long-range structures.
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Affiliation(s)
- T. Egami
- Joint Institute for Neutron Sciences, Department of Materials Science and Engineering and Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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13
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Sando I, Egami T. Anatomy of the para-vestibular canaliculus. Adv Otorhinolaryngol 2015; 25:34-40. [PMID: 314742 DOI: 10.1159/000402914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A histologic study of the para-vestibular canaliculus (PVC), its contents, and its relationship to the vestibular aqueduct (VA), is presented. 20 normal human temporal bones were fixed in 10% formalin solution, embedded in celloidin, and sectioned horizontally at intervals of 20 micrometers. Every tenth section was stained with hematoxylin and eosin (HE) and studied under a light microscope. Three significant observations were made. First, in 80% of the specimens, two rather than one PVC were found in the area of the vestibular orifice of the VA. Second, in 70% of the specimens, the PVC was found to merge with the VA rather than to enter the posterior cranial fossa (PCF) separately. Third, in all the specimens examined, a vein was seen to traverse the entire length of the PVC. However, in 17 specimens, no artery could be identified within the PVC. In the 13 (65%) specimens in which arteries could be identified in the PVC, the arteries extended only half the length of the PVC, from the PCF to the VA. In no specimen examined could arteries be seen extending the full length of the PVC from the PCF to the vestibule.
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14
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Abstract
It is difficult to relate the properties of liquids and glasses directly to their structure because of complexity in the structure that defies precise definition. The potential energy landscape (PEL) approach is a very insightful way to conceptualize the structure-property relationship in liquids and glasses, particularly the effect of temperature and history. However, because of the highly multidimensional nature of the PEL it is hard to determine, or even visualize, the actual details of the energy landscape. In this article we introduce a modified concept of the local energy landscape (LEL), which is limited in phase space, and demonstrate its usefulness using molecular dynamics simulation on a simple liquid at high temperatures. The local energy landscape is given as a function of the local coordination number, the number of the nearest-neighbor atoms. The excitation in the LEL corresponds to the so-called β-relaxation process. The LEL offers a simple but useful starting point to discuss complex phenomena in liquids and glasses.
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Affiliation(s)
- T Iwashita
- Joint Institute for Neutron Sciences and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T Egami
- Joint Institute for Neutron Sciences and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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15
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Abstract
Atomic size is perhaps the most commonly used concept to describe material properties. Advances in the understanding of materials are hindered by the available choices of simplifying concepts that can be used. However, the precise definition of atomic size is not easy, and often controversial. Atomic level stress provides a new interpretive tool that draws on the rich formalism of solid mechanics for use with density functional calculations to advance a deeper understanding of the properties of materials. We discuss atomic level stresses in liquids and glasses and make comparisons with ordered and disordered crystals. Somewhat surprisingly, even ordered compounds that are under no macroscopic stress and whose individual atoms are completely relaxed, i.e., no force acting on them, can have substantial atomic level stresses. On top of concepts such as the ionicity or covalency, the atomic level stresses add to the arsenal of analysis tools that are available to interpret the results of density functional calculations.
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Affiliation(s)
- D M Nicholson
- Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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16
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Abstract
The elementary excitations of vibration in solids are phonons. But in liquids phonons are extremely short lived and marginalized. In this Letter through classical and ab initio molecular dynamics simulations of the liquid state of various metallic systems we show that different excitations, the local configurational excitations in the atomic connectivity network, are the elementary excitations in high temperature metallic liquids. We also demonstrate that the competition between the configurational excitations and phonons determines the so-called crossover phenomenon in liquids. These discoveries open the way to the explanation of various complex phenomena in liquids, such as fragility and the rapid increase in viscosity toward the glass transition, in terms of these excitations.
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Affiliation(s)
- T Iwashita
- Department of Physics and Astronomy, Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D M Nicholson
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Egami
- Department of Physics and Astronomy, Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
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17
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Levashov VA, Morris JR, Egami T. The origin of viscosity as seen through atomic level stress correlation function. J Chem Phys 2013; 138:044507. [DOI: 10.1063/1.4789306] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [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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18
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Abstract
Atomic correlations in a simple liquid in steady-state flow under shear stress are studied by molecular dynamics simulation. The local atomic level strain is determined through the anisotropic pair-density function. The atomic level strain has a limited spatial extension whose range is dependent on the strain rate and extrapolates to zero at the critical strain rate. A failure event is identified with altering the local topology of atomic connectivity by exchanging bonds among neighboring atoms.
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Affiliation(s)
- T Iwashita
- Joint Institute for Neutron Sciences and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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19
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Weber F, Rosenkranz S, Castellan JP, Osborn R, Hott R, Heid R, Bohnen KP, Egami T, Said AH, Reznik D. Extended phonon collapse and the origin of the charge-density wave in 2H-NbSe2. Phys Rev Lett 2011; 107:107403. [PMID: 21981528 DOI: 10.1103/physrevlett.107.107403] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Indexed: 05/31/2023]
Abstract
We report inelastic x-ray scattering measurements of the temperature dependence of phonon dispersion in the prototypical charge-density-wave (CDW) compound 2H-NbSe2. Surprisingly, acoustic phonons soften to zero frequency and become overdamped over an extended region around the CDW wave vector. This extended phonon collapse is dramatically different from the sharp cusp in the phonon dispersion expected from Fermi surface nesting. Instead, our experiments, combined with ab initio calculations, show that it is the wave vector dependence of the electron-phonon coupling that drives the CDW formation in 2H-NbSe2 and determines its periodicity. This mechanism explains the so far enigmatic behavior of CDW in 2H-NbSe2 and may provide a new approach to other strongly correlated systems where electron-phonon coupling is important.
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Affiliation(s)
- F Weber
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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20
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Yasui T, Ohuchida K, Zhao M, Cui L, Onimaru M, Egami T, Fujita H, Ohtsuka T, Mizumoto K, Matsumoto K, Tanaka M. Adenoviral therapy is more effective in gemcitabine-resistant pancreatic cancer than in gemcitabine-sensitive cells. Anticancer Res 2011; 31:1279-1287. [PMID: 21508376] [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: 05/30/2023]
Abstract
BACKGROUND Although gemcitabine is the standard treatment for pancreatic cancer, this particular type of cancer develops rapidly and has intrinsic chemoresistance. Chemoresistance plays a critical role in tumor progression, invasion and migration. Nevertheless, the effect of adenoviral therapy on chemoresistant cancer cells has not been studied. In this study, we compared the efficacy of adenoviral therapy in parental and chemoresistant pancreatic cancer cells. MATERIALS AND METHODS To establish gemcitabine-resistant cells, pancreatic cancer SUIT2 cells were exposed to increasing concentrations of gemcitabine. Both parental and chemoresistant cells were infected with adenoviruses expressing either green fluorescent protein (Ad-GFP) or the hepatocyte growth factor antagonist, NK4 (Ad-NK4). To investigate the transduction efficacy, GFP expression and NK4 concentrations were measured and an invasion assay was used to investigate the efficacy of the adenoviral therapy. RESULTS The 50% inhibitory concentration of gemcitabine was <10 nM in the parental SUIT-2 cells, while it was >1 μM in gemcitabine-resistant cells. A large number of gemcitabine-resistant cells were GFP-positive compared with only a small number of parental cells (p<0.05). The NK4 expression level was significantly higher in gemcitabine-resistant cells than in parental cells (p<0.05). The supernatant from Ad-NK4-infected gemcitabine-resistant cells significantly inhibited the invasion of cancer cells compared with that from Ad-NK4-infected parental cells (p<0.05). CONCLUSION Both the efficiency of transduction and the therapeutic efficacy of adenoviral therapy were higher in gemcitabine-resistant cells than in parental cells, suggesting that adenoviral gene therapy is more effective in patients with gemcitabine-resistant pancreatic cancer.
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Affiliation(s)
- Takaharu Yasui
- Department of Surgery and Oncology, Kyushu University, Fukuoka 812-8582, Japan
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21
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Levashov VA, Morris JR, Egami T. Viscosity, shear waves, and atomic-level stress-stress correlations. Phys Rev Lett 2011; 106:115703. [PMID: 21469880 DOI: 10.1103/physrevlett.106.115703] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 02/01/2011] [Indexed: 05/30/2023]
Abstract
The Green-Kubo equation relates the macroscopic stress-stress correlation function to a liquid's viscosity. The concept of the atomic-level stresses allows the macroscopic stress-stress correlation function in the equation to be expressed in terms of the space-time correlations among the atomic-level stresses. Molecular dynamics studies show surprisingly long spatial extension of stress-stress correlations and also longitudinal and transverse waves propagating in liquids over ranges which could exceed the system size. The results reveal that the range of propagation of shear waves corresponds to the range of distances relevant for viscosity. Thus our results show that viscosity is a fundamentally nonlocal quantity. We also show that the periodic boundary conditions play a nontrivial role in molecular dynamics simulations, effectively masking the long-range nature of viscosity.
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Affiliation(s)
- V A Levashov
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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22
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Dmowski W, Fu S, Egami T, Gorte R, Vhos J. Structure Of Ceria Overlayer On Zirconia Crystal Studied by Surface Diffraction. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-401-115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractWe have utilized white x-ray beam and a Ge solid state detector, in energy dispersive mode, to study the diffraction from the surface layers of ceria deposited on (001) surface of Y stabilized cubic zirconia with grazing incident beam. We found that ceria forms islands, oriented epitaxially with respect to the zirconia substrate, with a lateral coherence of the order of 60 Å.
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Yasui T, Ohuchida K, Zhao M, Onimaru M, Egami T, Fujita H, Ohtsuka T, Mizumoto K, Tanaka M. Tumor-stroma interactions reduce the efficacy of adenoviral therapy through the HGF-MET pathway. Cancer Sci 2010; 102:484-91. [PMID: 21105966 DOI: 10.1111/j.1349-7006.2010.01783.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Many preclinical studies have shown the potential of adenovirus-based cancer gene therapy. However, successful translation of these promising results into the clinic has not yet been achieved. Pancreatic ductal adenocarcinoma (PDAC) is characterized by abundant desmoplastic stroma, and tumor-stromal cell interactions play a critical role in tumor progression. Therefore, we hypothesized that tumor-stroma interactions reduce the efficacy of adenoviral therapy. We investigated the effect of fibroblasts on adenovirus-based gene therapy using SUIT-2 and PANC-1 pancreatic cancer cells cultured with or without fibroblast-conditioned culture supernatant then infected with Ad-LacZ. After 48 h, the cells were stained for β-galactosidase. The results showed that the number of β-galactosidase-positive cells was significantly reduced after culture with fibroblast-conditioned supernatant (P < 0.05). Because the hepatocyte growth factor (HGF)/MET pathway plays an important role in tumor-stroma interactions we next investigated the involvement of this pathway in tumor-stroma interactions leading to the decreased efficacy of adenoviral therapy. SUIT-2 cells were cultured with or without SU11274 (a MET inhibitor) and/or fibroblast-conditioned culture supernatant, then infected with Ad-GFP. After 48 h, GFP-positive cells were counted. The number of GFP-positive cells in cultures containing fibroblast-conditioned supernatant plus SU11274 was significantly greater than in cultures without SU11274. In conclusion, our results suggest that stromal cells in PDAC reduce the efficacy of adenoviral therapy through a mechanism involving the HGF/MET pathway. Control of such tumor-stroma interactions may lead to improvements in adenoviral gene therapy for PDAC.
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Affiliation(s)
- Takaharu Yasui
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Abstract
When a stress is applied on a metallic glass it deforms following Hook's law. Therefore it may appear obvious that a metallic glass deforms elastically. Using x-ray diffraction and anisotropic pair-density function analysis we show that only about 3/4 in volume fraction of metallic glasses deforms elastically, whereas the rest of the volume is anelastic and in the experimental time scale deform without resistance. We suggest that this anelastic portion represents residual liquidity in the glassy state. Many theories, such as the free-volume theory, assume the density of defects in the glassy state to be of the order of 1%, but this result shows that it is as much as a quarter.
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Affiliation(s)
- W Dmowski
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
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25
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Abstract
Much theoretical work has been devoted to understanding the role of strong electron correlations in high-temperature superconductivity mainly through magnetic interactions, but the possible role of electron correlation in ferroelectricity of metal oxides has not received attention. Diagonalization of a simple many-body, tight-binding Hamiltonian shows that the electron-lattice interaction is dramatically enhanced in some cases by strong electron correlation because of deformation-induced charge transfer. This effect may be closely related to ferroelectricity and superconductivity in transition metal oxides.
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Mook HA, Lumsden MD, Christianson AD, Nagler SE, Sales BC, Jin R, McGuire MA, Sefat AS, Mandrus D, Egami T, dela Cruz C. Unusual relationship between magnetism and superconductivity in FeTe(0.5)Se(0.5). Phys Rev Lett 2010; 104:187002. [PMID: 20482201 DOI: 10.1103/physrevlett.104.187002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Indexed: 05/29/2023]
Abstract
We use neutron scattering to study magnetic excitations in crystals near the ideal superconducting composition of FeTe(0.5)Se(0.5). Two types of excitations are found, a resonance at (0.5,0.5,0) and incommensurate fluctuations on either side of this position. We show that the two sets of magnetic excitations behave differently with doping, with the resonance being fixed in position while the incommensurate excitations move as the doping is changed. These unusual results show that a common behavior of the low energy magnetic excitations is not necessary for pairing in these materials.
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Affiliation(s)
- H A Mook
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
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Onimaru M, Ohuchida K, Egami T, Mizumoto K, Nagai E, Cui L, Toma H, Matsumoto K, Hashizume M, Tanaka M. Gemcitabine synergistically enhances the effect of adenovirus gene therapy through activation of the CMV promoter in pancreatic cancer cells. Cancer Gene Ther 2010; 17:541-9. [DOI: 10.1038/cgt.2010.9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Onimaru M, Ohuchida K, Nagai E, Mizumoto K, Egami T, Cui L, Sato N, Uchino J, Takayama K, Hashizume M, Tanaka M. Combination with low-dose gemcitabine and hTERT-promoter-dependent conditionally replicative adenovirus enhances cytotoxicity through their crosstalk mechanisms in pancreatic cancer. Cancer Lett 2010; 294:178-86. [PMID: 20163915 DOI: 10.1016/j.canlet.2010.01.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Revised: 01/26/2010] [Accepted: 01/26/2010] [Indexed: 12/31/2022]
Abstract
To overcome the limited clinical efficacy of conditionally replicative adenoviruses (CRAds), we investigated the effects of combination therapy with gemcitabine (GEM) and the hTERT-promoter-dependent CRAd (hTERT-CRAd), Ad5/3hTERTE1. This combination therapy exhibited enhanced cytotoxic effects on pancreatic cancer both in vitro and in vivo. Furthermore, we revealed that this enhancement effect was due to the multiple bidirectional interactions between hTERT-CRAd and GEM. The GEM-sensitizing effect of E1 expression derived from hTERT-CRAd, and the enhancement effect by GEM on hTERT promoter activity which led to the increase of adenovirus E1 and viral infectivity. This combination therapy may be a promising therapeutic approach for pancreatic cancer.
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Affiliation(s)
- Manabu Onimaru
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Maidashi, Fukuoka, Japan
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Proffen T, Billinge SJL, Egami T, Louca D. Structural analysis of complex materials using the atomic pair distribution function — a practical guide. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zkri.218.2.132.20664] [Citation(s) in RCA: 185] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Modern materials and their properties are often characterized by varying degrees of disorder. Routine crystallographic structure solution only reveals the average structure. The study of Bragg and diffuse scattering yields the local atomic arrangements holding the key to understanding increasingly complex materials. In this paper we review the pair distribution function technique used to unravel the local structure. We aim to give a practical overview and make this method easily accessible to the wider scientific community.
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Fujita H, Ohuchida K, Mizumoto K, Egami T, Miyoshi K, Moriyama T, Cui L, Yu J, Zhao M, Manabe T, Tanaka M. Tumor-stromal interactions with direct cell contacts enhance proliferation of human pancreatic carcinoma cells. Cancer Sci 2009; 100:2309-17. [PMID: 19735487 DOI: 10.1111/j.1349-7006.2009.01317.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Pancreatic ductal adenocarcinoma is often characterized by an abundant desmoplastic stroma that is partially induced by activated pancreatic stellate cells (PSCs). Indirect co-culture has often been used to investigate the effects of cancer-stromal interactions on the proliferation of cancer cells, but the effects of cell-cell adhesion and juxtacrine signaling between cancer and stromal cells cannot be evaluated using this method. This study aimed to establish a simplified direct co-culture system that could be used to quantify populations of cancer cells in co-culture with PSCs, and to evaluate the effects of direct cell contact on the proliferation of cancer cells. We established three green fluorescent protein (GFP)-expressing pancreatic cancer cell lines and were able to quantify them with high reliability and reproducibility, even when co-cultured directly with PSCs, using a color plate reader. We assessed the differential effects of direct and indirect co-culture with PSCs on the proliferation of cancer cells, and found that the proliferation of GFP-expressing pancreatic cancer cell lines was dramatically enhanced by direct co-culture with PSCs, compared with the indirect co-culture system. We also found that direct co-culture of cancer cells and PSCs activated the Notch signaling pathway in both cell types. Direct cell contact between cancer cells and PSCs plays an important role in the control of cancer cell proliferation, and is essential to the understanding of tumor-stromal interactions.
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Affiliation(s)
- Hayato Fujita
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Egami T, Ohuchida K, Yasui T, Mizumoto K, Onimaru M, Toma H, Sato N, Matsumoto K, Tanaka M. Up-regulation of integrin beta3 in radioresistant pancreatic cancer impairs adenovirus-mediated gene therapy. Cancer Sci 2009; 100:1902-7. [PMID: 19604247 DOI: 10.1111/j.1349-7006.2009.01245.x] [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: 11/28/2022] Open
Abstract
Adenovirus-mediated gene therapy is a promising approach for the treatment of pancreatic cancer. We previously reported that radiation enhanced adenovirus-mediated gene expression in pancreatic cancer, suggesting that adenoviral gene therapy might be more effective in radioresistant pancreatic cancer cells. In the present study, we compared the transduction efficiency of adenovirus-delivered genes in radiosensitive and radioresistant cells, and investigated the underlying mechanisms. We used an adenovirus expressing the hepatocyte growth factor antagonist, NK4 (Ad-NK4), as a representative gene therapy. We established two radioresistant human pancreatic cancer cell lines using fractionated irradiation. Radiosensitive and radioresistant pancreatic cancer cells were infected with Ad-NK4, and NK4 levels in the cells were measured. In order to investigate the mechanisms responsible for the differences in the transduction efficiency between these cells, we measured expression of the genes mediating adenovirus infection and endocytosis. The results revealed that NK4 levels in radioresistant cells were significantly lower (P < 0.01) than those in radiosensitive cells, although there were no significant differences in adenovirus uptake between radiosensitive cells and radioresistant cells. Integrin beta3 was up-regulated and the Coxsackie virus and adenovirus receptor was down-regulated in radioresistant cells, and inhibition of integrin beta3 promoted adenovirus gene transfer. These results suggest that inhibition of integrin beta3 in radioresistant pancreatic cancer cells could enhance adenovirus-mediated gene therapy.
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Affiliation(s)
- Takuya Egami
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Lumsden MD, Christianson AD, Parshall D, Stone MB, Nagler SE, MacDougall GJ, Mook HA, Lokshin K, Egami T, Abernathy DL, Goremychkin EA, Osborn R, McGuire MA, Sefat AS, Jin R, Sales BC, Mandrus D. Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2. Phys Rev Lett 2009; 102:107005. [PMID: 19392149 DOI: 10.1103/physrevlett.102.107005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Indexed: 05/27/2023]
Abstract
Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wave vectors (1/2 1/2 L) in tetragonal notation. On cooling below T_{C}, a clear resonance peak is observed at this wave vector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) k_{B}T_{C}. This is in good agreement with the canonical value of 5 k_{B}T_{C} observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c axis, indicating that the magnetic fluctuations are two dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds.
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Affiliation(s)
- M D Lumsden
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Egami T, Ohuchida K, Miyoshi K, Mizumoto K, Onimaru M, Toma H, Sato N, Matsumoto K, Tanaka M. Chemotherapeutic agents potentiate adenoviral gene therapy for pancreatic cancer. Cancer Sci 2009; 100:722-9. [PMID: 19302285 DOI: 10.1111/j.1349-7006.2009.01101.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Adenovirus-mediated gene therapy combined with chemotherapeutic agents is expected to represent a new approach for treating pancreatic cancer. However, there have been no reports of definitive effects of chemotherapeutic agents on adenovirus-mediated gene therapies. In the present study, we investigated the effects of chemotherapeutic agents on the transduction efficiency of an adenovirus-based gene therapy. Adenovirus (Ad-NK4) expressing NK4, which acts as a hepatocyte growth factor antagonist, was used as a representative gene therapy. Pancreatic cancer cells infected with Ad-NK4 were treated with chemotherapeutic agents (5-fluorouracil [5FU], cisplatin or etoposide), and the NK4 levels in their culture media were measured. To examine the effects of chemotherapeutic agents in vivo, Ad-NK4 was administered to subcutaneous tumors in mice after treatment with the agents, and the tumor NK4 levels were measured. The NK4 levels in culture media from cells treated with 5FU, cisplatin and etoposide were 5.2-fold (P = 0.026), 6-fold (P < 0.001) and 4.3-fold (P < 0.001) higher than those of untreated cells, respectively. The chemotherapeutic agents also increased Ad-NK4 uptake. The NK4 levels in tumors treated with 5FU, cisplatin and etoposide were 5.4-fold (P = 0.006), 11.8-fold (P < 0.001) and 4.9-fold (P = 0.017) higher than those in untreated tumors, respectively. The present findings suggest that chemotherapeutic agents significantly improve the efficiency of adenovirus-mediated gene transfer in pancreatic cancer. Furthermore, they will contribute to decreases in the adenovirus doses required for gene transfer, thereby controlling the side-effects of adenovirus infection in normal tissues.
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Affiliation(s)
- Takuya Egami
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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Yu J, Ohuchida K, Nakata K, Mizumoto K, Cui L, Fujita H, Yamaguchi H, Egami T, Kitada H, Tanaka M. LIM only 4 is overexpressed in late stage pancreas cancer. Mol Cancer 2008; 7:93. [PMID: 19099607 PMCID: PMC2628350 DOI: 10.1186/1476-4598-7-93] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Accepted: 12/22/2008] [Indexed: 12/21/2022] Open
Abstract
Background LIM-only 4 (LMO4), a member of the LIM-only (LMO) subfamily of LIM domain-containing transcription factors, was initially reported to have an oncogenic role in breast cancer. We hypothesized that LMO4 may be related to pancreatic carcinogenesis as it is in breast carcinogenesis. If so, this could result in a better understanding of tumorigenesis in pancreatic cancer. Methods We measured LMO4 mRNA levels in cultured cells, pancreatic bulk tissues and microdissected target cells (normal ductal cells; pancreatic intraepithelial neoplasia-1B [PanIN-1B] cells; PanIN-2 cells; invasive ductal carcinoma [IDC] cells; intraductal papillary-mucinous adenoma [IPMA] cells; IPM borderline [IPMB] cells; and invasive and non-invasive IPM carcinoma [IPMC]) by quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR). Results 9 of 14 pancreatic cancer cell lines expressed higher levels of LMO4 mRNA than did the human pancreatic ductal epithelial cell line (HPDE). In bulk tissue samples, expression of LMO4 was higher in pancreatic carcinoma than in intraductal papillary-mucinous neoplasm (IPMN) or non-neoplastic pancreas (p < 0.0001 for both). We carried out microdissection-based analyses. IDC cells expressed significantly higher levels of LMO4 than did normal ductal epithelia or PanIN-1B cells (p < 0.001 for both) or PanIN-2 cells (p = 0.014). IPMC cells expressed significantly higher levels of LMO4 than did normal ductal epithelia (p < 0.001), IPMA (p < 0.001) and IPMB cells (p = 0.003). Conclusion Pancreatic carcinomas (both IDC and IPMC) expressed significantly higher levels of LMO4 mRNA than did normal ductal epithelia, PanIN-1B, PanIN-2, IPMA and IPMB. These results suggested that LMO4 is overexpressed at late stages in carcinogenesis of pancreatic cancer.
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Affiliation(s)
- Jun Yu
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Levashov VA, Egami T, Aga RS, Morris JR. Atomic bond fluctuations and crossover to potential-energy-landscape-influenced regime in supercooled liquid. Phys Rev E Stat Nonlin Soft Matter Phys 2008; 78:041202. [PMID: 18999407 DOI: 10.1103/physreve.78.041202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 08/14/2008] [Indexed: 05/27/2023]
Abstract
The ideas related to potential-energy landscape and cooperativity of atomic rearrangements are widely discussed in the research field of glass transition. The crossover transition from high-temperature regime to potential-energy-landscape-influenced regime was extensively studied using the concept of inherent structure. However, the interpretation of this crossover behavior in terms of microscopic changes in real structures is still lacking. In this paper we present several observations on the crossover behavior on real structures. We compare fluctuations in the global properties (total number of bonds, total potential energy, pressure) versus fluctuations in the local properties (coordination number, atomic potential energy, local atomic pressure) by means of molecular dynamics simulations. We then show that the total and local fluctuations in the number of atomic bonds in the system depend on temperature differently above and below the temperature of crossover to the landscape-influenced regime. Similarly, the ratio between the global and local fluctuations in the potential energy and pressure changes in the vicinity of the crossover temperature, whereas the change is less distinct than in the case of the bond fluctuations. Our results indicate that local fluctuations become more correlated below the crossover temperature, most likely via the interaction through the dynamic shear elastic field.
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Affiliation(s)
- V A Levashov
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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Fujita H, Ohuchida K, Mizumoto K, Egami T, Miyasaka Y, Yamaguchi H, Yu J, Cui L, Onimaru M, Takahata S, Tsuneyoshi M, Tanaka M. Quantitative analysis of hTERT mRNA levels in cells microdissected from cytological specimens. Cancer Sci 2008; 99:2244-51. [PMID: 18795940 DOI: 10.1111/j.1349-7006.2008.00930.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Clinicians frequently require cytopathological assessment of tumor samples for preoperative diagnosis, but in some specimens, diagnosis remains inconclusive after cytological examination. To date, several molecular markers, including human telomerase reverse transcriptase (hTERT), have been assessed for the ability to detect malignancy. However, analyses using whole cytological specimens are generally affected by contamination of untargeted cells. The present study investigated the feasibility of more sensitive examination by quantitative mRNA analysis of target cells microdissected from cytological specimens. Laser capture microdissection (LCM) was used to obtain target cells from cytological specimens. hTERT mRNA levels were then measured in target cells by quantitative real-time RT-PCR (qRT-PCR). The effect of RNA fragmentation on qRT-PCR was also assessed. Total RNA from cytological specimens was sometimes fragmented to a large degree. To avoid the effect of RNA fragmentation, gene specific priming and PCR primers generating short PCR products were used and no difference in delta Ct values between fragmented and non-fragmented RNA were found. hTERT mRNA levels were measured in cells microdissected from 33 cytological specimens. The levels of hTERT mRNA were significantly higher in malignant cases compared to those in non-malignant cases (P = 0.0003). The sensitivity was 96.2%, even when the specificities were 100%. High levels of hTERT mRNA were also found in three cases that were not diagnosed as malignant by cytological examination. Quantitative assessment of hTERT mRNA levels in cells microdissected from cytological specimens is a potential diagnostic tool to potentiate cytological examination in diagnosing malignancy.
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Affiliation(s)
- Hayato Fujita
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Ohhashi S, Ohuchida K, Mizumoto K, Fujita H, Egami T, Yu J, Toma H, Sadatomi S, Nagai E, Tanaka M. Down-regulation of deoxycytidine kinase enhances acquired resistance to gemcitabine in pancreatic cancer. Anticancer Res 2008; 28:2205-2212. [PMID: 18751396] [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: 05/26/2023]
Abstract
BACKGROUND The functional roles of deoxycytidine kinase (dCK) in acquired resistance to gemcitabine remain unknown in pancreatic cancer. Here, the functional involvement of dCK in gemcitabine-resistance of pancreatic cancer was investigated. MATERIALS AND METHODS The levels of the dCK gene as well as other gemcitabine-related genes (hENT1, RRM1 and RRM2) were analyzed in gemcitabine-resistant pancreatic cancer cells (GR cells) using quantitative real-time reverse transcription polymerase chain reaction. The effects of inhibition of these genes on sensitivity to gemcitabine were evaluated. RESULTS In GR cells, expression of dCK was significantly reduced compared with that of parental cells (p < 0.05). The dCK-targeting siRNA significantly reduced gemcitabine sensitivity (p < 0.01) without affecting cell proliferation. The RRM1- and RRM2-targeting siRNAs increased gemcitabine sensitivity (p < 0.05) and reduced cell proliferation even without gemcitabine treatment. The hENT-targeting siRNA did not affect gemcitabine sensitivity or cell proliferation. CONCLUSION Down-regulation of dCK specifically enhanced acquired resistance to gemcitabine in pancreatic cancer cells without affecting their proliferation.
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Affiliation(s)
- Seiji Ohhashi
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Braiman Y, Egami T. Transitions from oscillatory to smooth fracture propagation in brittle metallic glasses. Phys Rev E Stat Nonlin Soft Matter Phys 2008; 77:065101. [PMID: 18643323 DOI: 10.1103/physreve.77.065101] [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: 09/12/2007] [Revised: 03/26/2008] [Indexed: 05/26/2023]
Abstract
We present a simple model to explain the transition from oscillatory to smooth crack propagation in brittle metallic glasses. We demonstrate that the smooth fracture propagation that is characteristic for higher temperature or higher crack opening velocities (for type 1 crack propagation) becomes unstable and oscillatory behavior is being observed. The characteristic feature size of the crack propagation may be at the nanometer scale and grows as the opening velocity decreases.
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Affiliation(s)
- Y Braiman
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Dmowski W, Vakhrushev SB, Jeong IK, Hehlen MP, Trouw F, Egami T. Local lattice dynamics and the origin of the relaxor ferroelectric behavior. Phys Rev Lett 2008; 100:137602. [PMID: 18517997 DOI: 10.1103/physrevlett.100.137602] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Indexed: 05/26/2023]
Abstract
Relaxor ferroelectricity is observed in many strongly disordered ferroelectric solids. However, the atomistic mechanism of the phenomenon, particularly at high temperatures, is not well understood. In this Letter we show the local lattice dynamics as the origin of relaxor ferroelectricity through the first use of the dynamic pair-density function determined by pulsed neutron inelastic scattering. For a prototypical relaxor ferroelectric, Pb(Mg(1/3)Nb(2/3))O(3), we demonstrate that the dynamic local polarization sets in around the so-called Burns temperature through the interaction of off-centered Pb ions with soft phonons, and the slowing down of local polarization with decreasing temperature produces the polar nanoregions and the relaxor behavior below room temperature.
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Affiliation(s)
- W Dmowski
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
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Abstract
We investigated seroconversion rates in febrile children after measles vaccination. Among 6364 vaccinees, 501 children had a temperature of 37.5 degrees C or higher within 7 days of vaccination. The seroconversion rate assessed by a haemagglutination-inhibition assay was 76.6% in 501 febrile children but 95.2% in 84 afebrile controls. Measles vaccination has been reported to provide immunity in at least 95% of cases. The number of patients infected with measles has dramatically decreased since the introduction of measles vaccination. However, problems remain, including primary vaccine failure (PVF), failure to develop immunity after vaccination, and secondary vaccine failure (SVF), that is, the development of infection because of waning antibodies after vaccination. In this study, we investigated the effect of febrile upper respiratory tract infection (URTI) after vaccination and found a lower rate of seroconversion to measles and a lower mean antibody titre in those who developed a fever within 7 days of measles vaccination.
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Affiliation(s)
- T Egami
- EGAMI Children's Clinic, 8-16-63, Kusunoki, Kumamoto 862-8003, Japan.
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Egami T, Ohuchida K, Mizumoto K, Onimaru M, Toma H, Nishio S, Nagai E, Matsumoto K, Nakamura T, Tanaka M. Radiation Enhances Adenoviral Gene Therapy in Pancreatic Cancer via Activation of Cytomegalovirus Promoter and Increased Adenovirus Uptake. Clin Cancer Res 2008; 14:1859-67. [DOI: 10.1158/1078-0432.ccr-07-0933] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract
Purpose: Adenovirus-mediated gene therapy combined with radiation is expected to be a new approach to treat pancreatic cancer. However, there are no reports of definitive effects of radiation on adenovirus-mediated gene therapies. In the present study, we investigated the effect of radiation on the transduction efficiency of an adenovirus-based gene therapy.
Experimental Design: We used adenovirus expressing NK4 (Ad-NK4), an antagonist for hepatocyte growth factor, as a representative gene therapy. Pancreatic cancer cells preinfected with Ad-NK4 were irradiated, and NK4 levels in culture media of these cells were measured. We investigated cytomegalovirus (CMV) promoter activity and uptake of adenovirus in these cells. To examine the effect of radiation in vivo, Ad-NK4 was given to irradiated subcutaneous tumors in nude mice, and NK4 levels in tumors were measured.
Results: NK4 levels in culture media of irradiated cells were 4.5-fold (P < 0.01) higher than those of nonirradiated cells. Radiation enhanced activation of the CMV promoter and adenovirus uptake (P < 0.01), leading to increased levels of NK4. We found that activation of p38 mitogen-activated protein kinase and up-regulation of dynamin 2 may be involved in the radiation-induced activation of the CMV promoter and adenovirus uptake, respectively. NK4 levels in irradiated tumors were 5.8-fold (P = 0.017) higher than those in nonirradiated tumors.
Conclusions: The present findings suggest that radiation significantly improves the efficiency of adenovirus-mediated gene transfer in pancreatic cancer and probably contributes to decreasing the dose of adenovirus required for gene transfer and controlling side effects of adenovirus infection in nonirradiated normal tissue.
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Affiliation(s)
- Takuya Egami
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Kenoki Ohuchida
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Kazuhiro Mizumoto
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Manabu Onimaru
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Hiroki Toma
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Shoko Nishio
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Eishi Nagai
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
| | - Kunio Matsumoto
- 2Department of Oncology, Division of Biochemistry, Biomedical Research Center, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Toshikazu Nakamura
- 2Department of Oncology, Division of Biochemistry, Biomedical Research Center, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masao Tanaka
- 1Department of Surgery and Oncology and Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan and
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Borisov SA, Vakhrushev SB, Koroleva EY, Naberezhnov AA, Syrnikov PP, Simkin VG, Kutnjak Z, Egami T, Dmowski W, Piekarz P. Investigation into the evolution of the structure of K1−x LixTa1−y NbyO3 single crystals under variations in temperature. CRYSTALLOGR REP+ 2007. [DOI: 10.1134/s1063774507030169] [Citation(s) in RCA: 3] [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: 11/23/2022]
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Yamada D, Ohuchida K, Mizumoto K, Ohhashi S, Yu J, Egami T, Fujita H, Nagai E, Tanaka M. Increased expression of ADAM 9 and ADAM 15 mRNA in pancreatic cancer. Anticancer Res 2007; 27:793-9. [PMID: 17465204] [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: 05/15/2023]
Abstract
BACKGROUND A disintegrin and metalloproteases (ADAMs) comprise a multifunctional family of membrane-anchored proteins. ADAM 9 and ADAM 15 are involved in cell migration and invasion. Expression of ADAM 9 and ADAM 15 was reported to be altered in several types of cancer. MATERIALS AND METHODS Quantitative real-time reverse transcription-polymerase chain reaction was performed to measure the expression of ADAM 9 mRNA in bulk pancreatic tissues. Results showed no significant difference in the expression of ADAM 9 mRNA between pancreatic cancer and non-neoplastic pancreas. Primary cultured pancreatic fibroblasts also expressed ADAM 9 mRNA. Therefore, a laser microdissection and pressure catapulting technique was employed to isolate cancer cells from tumor tissues. The expression of ADAM 9 and ADAM 15 mRNA was measured in microdissected samples (cancer cells, n = 11; normal epithelial cells, n = 13 for ADAM 9; cancer cells, n = 9; normal epithelial cells, n = 9 for ADAM 15). RESULTS Pancreatic cancer cells expressed significantly higher levels of ADAM 9 and ADAM 15 mRNA than did normal pancreatic epithelial cells (p = 0.016 for ADAM 9; p = 0.004 for ADAM 15). CONCLUSION ADAM 9 and ADAM 15 are involved in pancreatic cancer. Microdissection-based analysis appears to be indispensable for the accurate analysis of the expression of certain ADAM family members in pancreatic cancer.
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Affiliation(s)
- Daisuke Yamada
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Ohuchida K, Mizumoto K, Egami T, Yamaguchi H, Fujii K, Konomi H, Nagai E, Yamaguchi K, Tsuneyoshi M, Tanaka M. S100P is an early developmental marker of pancreatic carcinogenesis. Clin Cancer Res 2006; 12:5411-6. [PMID: 17000674 DOI: 10.1158/1078-0432.ccr-06-0298] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [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: 12/25/2022]
Abstract
PURPOSE Our goal was to clarify the involvement and clinical significance of S100P in pancreatic carcinogenesis. EXPERIMENTAL DESIGN We examined S100P expression in 45 bulk pancreatic tissues; in microdissected cells, including invasive ductal carcinoma (IDC) cells (20 sections), pancreatic intraepithelial neoplasia (PanIN) cells (12 sections), intraductal papillary mucinous neoplasm (IPMN) cells (19 sections), and normal epithelial cells (11 sections); and in pancreatic juice samples from 99 patients with pancreatic diseases (32 cancer, 35 IPMN, and 32 chronic pancreatitis samples). We used quantitative real-time reverse transcription-PCR with gene-specific priming to measure S100P in these various types of samples. RESULTS In bulk tissue analyses, pancreatic cancer and IPMN expressed significantly higher levels of S100P than did nonneoplastic pancreas (P<0.017 and P=0.0013, respectively). Microdissection analyses revealed that IPMN expressed significantly higher levels of S100P than did IDC (P<0.0001) and PanIN (P=0.0031), although S100P expression did not differ between IDC and PanIN (P=0.077). In pancreatic juice analyses, cancer and IPMN juice expressed significantly higher levels of S100P than did pancreatitis juice (both P<0.0001). Receiver operating characteristic curve analyses revealed that measurement of S100P in pancreatic juice was useful for discriminating neoplastic disease from chronic pancreatitis (area under the curve=0.837; 95% confidence interval, 0.749-0.903). CONCLUSION S100P may be an early developmental marker of pancreatic carcinogenesis, and measurement of S100P in pancreatic juice may be useful for early detection of pancreatic cancer or screening of early pancreatic carcinogenesis.
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Affiliation(s)
- Kenoki Ohuchida
- Department of Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Petit L, Stocks GM, Egami T, Szotek Z, Temmerman WM. Ground state valency and spin configuration of the Ni ions in nickelates. Phys Rev Lett 2006; 97:146405. [PMID: 17155276 DOI: 10.1103/physrevlett.97.146405] [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: 03/23/2006] [Indexed: 05/12/2023]
Abstract
The ab initio self-interaction-corrected local-spin-density approximation is used to study the electronic structure of both stoichiometric and nonstoichiometric nickelates. From total energy considerations it emerges that, in their ground state, both LiNiO2 and NaNiO2 are insulators, with the Ni ion in the Ni3+ low-spin state (t(2g)(6)e(g)(1)) configuration. It is established that a substitution of a number of Li/Na atoms by divalent impurities drives an equivalent number of Ni ions in the NiO2 layers from the Jahn-Teller (JT)-active trivalent low-spin state to the JT-inactive divalent state. We describe how the observed considerable differences between LiNiO2 and NaNiO2 can be explained through the creation of Ni2+ impurities in LiNiO2. The indications are that the random distribution of the Ni2+ impurities might be responsible for the destruction of the long-range orbital ordering in LiNiO2.
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Affiliation(s)
- L Petit
- Computer Science and Mathematics Division, and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Yu J, Ohuchida K, Mizumoto K, Ishikawa N, Ogura Y, Yamada D, Egami T, Fujita H, Ohashi S, Nagai E, Tanaka M. Overexpression of c-met in the early stage of pancreatic carcinogenesis; altered expression is not sufficient for progression from chronic pancreatitis to pancreatic cancer. World J Gastroenterol 2006; 12:3878-82. [PMID: 16804974 PMCID: PMC4087937 DOI: 10.3748/wjg.v12.i24.3878] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate c-met expression during early pancreatic carcinogenesis.
METHODS: We used 46 bulk tissues and 36 micro-dissected samples, including normal pancreas, chronic pancreatitis, and pancreatic cancer, for quantitative real-time reverse transcription-polymerase chain reaction.
RESULTS: In bulk tissue analyses, pancreatic cancer tissues expressed significantly higher levels of c-met than did chronic pancreatitis and normal pancreas tissues. c-met levels did not differ between chronic pancreatitis and normal pancreas tissues. In microdissection-based analyses, c-met was expressed at higher levels in microdissected pancreatic cancer cells and pancreatitis-affected epithelial cells than in normal ductal epithelial cells (both, P < 0.01). Interestingly, pancreatitis-affected epithelial cells expressed levels of c-met similar to those of pancreatic cancer cells.
CONCLUSION: Overexpression of c-met occurs during the early stage of pancreatic carcinogenesis, and a single alteration of c-met expression is not sufficient for progression of chronic pancreatitis-affected epithelial cells to pancreatic cancer cells.
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MESH Headings
- Biomarkers, Tumor/analysis
- Cell Line, Tumor
- Cell Transformation, Neoplastic
- Cells, Cultured
- DNA, Neoplasm/analysis
- DNA, Neoplasm/genetics
- Disease Progression
- Epithelial Cells/chemistry
- Epithelial Cells/cytology
- Epithelial Cells/pathology
- Fibroblasts/chemistry
- Fibroblasts/cytology
- Fibroblasts/pathology
- Gene Expression Regulation, Neoplastic
- Humans
- Pancreatic Neoplasms/chemistry
- Pancreatic Neoplasms/genetics
- Pancreatic Neoplasms/pathology
- Pancreatic Neoplasms/physiopathology
- Pancreatitis, Chronic/genetics
- Pancreatitis, Chronic/pathology
- Pancreatitis, Chronic/physiopathology
- Precancerous Conditions/chemistry
- Precancerous Conditions/genetics
- Precancerous Conditions/pathology
- Precancerous Conditions/physiopathology
- Proto-Oncogene Proteins c-met/metabolism
- RNA, Messenger/analysis
- RNA, Messenger/genetics
- Reverse Transcriptase Polymerase Chain Reaction
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Affiliation(s)
- Jun Yu
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Egami T. Static and dynamic pair correlation functions determined by neutron scattering and inelastic correction to total scattering. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305096017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Jeong IK, Darling TW, Lee JK, Proffen T, Heffner RH, Park JS, Hong KS, Dmowski W, Egami T. Medium range ordering of local polarizations in Pb(Mg 1/3Nb 2/3)O 3. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305095991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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