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Kamiyama H, Nonaka C, Saitoh H, Ohno M, Shimizu Y, Isoda K. Anatase and rutile titanium oxide nanoparticles induce acute kidney injury by coadministration with paraquat, cisplatin or 5-aminosalicylic acid. Pharmazie 2024; 79:2-5. [PMID: 38509631 DOI: 10.1691/ph.2024.3655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
Nanoparticles are used in a variety of fields; for example, titanium oxide nanoparticles are used in paints, food additives, cosmetics, and sunscreen materials. Although the use of titanium oxide nanoparticles is regulated, their safety has not been established. Furthermore, the interaction between titanium oxide nanoparticles and various chemical substances and pharmaceuticals is unknown. We co-administered rutile-type titanium oxide nanoparticles (nTR) or anatase-type titanium oxide nanoparticles (nTA) to mice together with paraquat (PQ), cisplatin (CDDP), or anti-5-aminosalicylic acid (5-ASA), and investigated the extent, if any, of liver and kidney injury. As a result, when nTA and nTR were administered alone, no increases were observed in aspartate aminotransferase (AST) and alanine aminotransferase (ALT), which are indicators of liver damage, or urea nitrogen (BUN), which is an indicator of kidney damage. Next, nTA and nTR were co-administered with PQ, CDDP or 5-ASA. Although no increase in ALT or AST was observed, BUN levels increased significantly and acute kidney injury was induced. The findings suggested that titanium oxide nanoparticles induce acute kidney injury through their interaction with chemicals and drugs.
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Affiliation(s)
- H Kamiyama
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan;
| | - C Nonaka
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan
| | - H Saitoh
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan
| | - M Ohno
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan
| | - Y Shimizu
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan
| | - K Isoda
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, 4-21-2 Nakano-ku, Tokyo 164-8530, Japan
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Saitoh H, Nishiura M, Nakazawa T, Morikawa J, Yoshida Z, Osawa R. Electro-optic Bdot probe measurement of magnetic fluctuations in plasma. Rev Sci Instrum 2022; 93:103540. [PMID: 36319310 DOI: 10.1063/5.0089031] [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: 02/22/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
We propose a combined use of a Pockels electro-optic sensor with a pickup loop coil (Bdot probe) for the measurement of magnetic fluctuations in plasmas. In this method, induced fluctuating voltage on the coil loop is converted into an optical signal by a compact electro-optic sensor in the vicinity of the measurement point and is transferred across optical fiber that is unaffected by electric noise or capacitive load issues. Compared with conventional Bdot probes, the electro-optic Bdot probe (1) is electrically isolated and free from noise pickup caused by the metallic transmission line and (2) can be operated at a higher-frequency range because of the smaller capacitance of the operation circuit, both of which are suitable for many plasma experiments. Conversely, the sensitivity of the current electro-optic Bdot probe arrangement is still significantly lower than that of conventional Bdot probes. A preliminary measurement result with the electro-optic Bdot probe showed the detection of a magnetic fluctuation signal around the cyclotron frequency range in the RT-1 magnetospheric plasma experiment.
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Affiliation(s)
- H Saitoh
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - M Nishiura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - T Nakazawa
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - J Morikawa
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Z Yoshida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
| | - R Osawa
- Seikoh Giken Co., Ltd., 296-1 Matsuhidai, Matsudo, Chiba 270-2214, Japan
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Saitoh H, Stoneking MR, Pedersen TS. A levitated magnetic dipole configuration as a compact charged particle trap. Rev Sci Instrum 2020; 91:043507. [PMID: 32357734 DOI: 10.1063/1.5142863] [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: 12/18/2019] [Accepted: 03/28/2020] [Indexed: 06/11/2023]
Abstract
As a magnetic confinement configuration for electron-positron pair-plasmas, the APEX collaboration [T. S. Pedersen et al., New J. Phys. 14, 035010 (2012)] plans to construct a compact levitated dipole experiment with a high-temperature superconducting coil. In order to realize stable levitation of the dipole field coil, a simple feedback-controlled levitation system was constructed with conventional analog circuits. We report the properties of a prototype levitation system using a permanent magnet and compare its behavior to predictions from a stability analysis. We also present a practical review needed for the construction of a compact levitated dipole trap system based on the work of Morikawa et al. [Teion Kogaku, J. Cryo. Soc. Jpn. 39, 209 (2004)]. Numerical orbit analysis suggests improved confinement properties of charged particles in a dipole field trap by replacing the permanent magnet with a levitated superconducting coil magnet. Such a compact dipole field configuration is potentially applicable to the confinement of various charged particles including positrons and electrons.
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Affiliation(s)
- H Saitoh
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - M R Stoneking
- Division E4, Max Planck Institute for Plasma Physics, Greifswald 17491 and Garching 85748, Germany
| | - T Sunn Pedersen
- Division E4, Max Planck Institute for Plasma Physics, Greifswald 17491 and Garching 85748, Germany
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Horn-Stanja J, Stenson EV, Stoneking MR, Singer M, Hergenhahn U, Nißl S, Saitoh H, Pedersen TS, Dickmann M, Hugenschmidt C, Danielson JR. Injection of intense low-energy reactor-based positron beams into a supported magnetic dipole trap. ACTA ACUST UNITED AC 2020. [DOI: 10.1088/2516-1067/ab6f44] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Stenson EV, Nißl S, Hergenhahn U, Horn-Stanja J, Singer M, Saitoh H, Pedersen TS, Danielson JR, Stoneking MR, Dickmann M, Hugenschmidt C. Lossless Positron Injection into a Magnetic Dipole Trap. Phys Rev Lett 2018; 121:235005. [PMID: 30576193 DOI: 10.1103/physrevlett.121.235005] [Citation(s) in RCA: 2] [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: 05/21/2018] [Indexed: 06/09/2023]
Abstract
The high-efficiency injection of a low-energy positron beam into the confinement volume of a magnetic dipole has been demonstrated experimentally. This was accomplished by tailoring the three-dimensional guiding-center drift orbits of positrons via optimization of electrostatic potentials applied to electrodes at the edge of the trap, thereby producing localized and essentially lossless cross-field particle transport by means of the E×B drift. The experimental findings are reproduced and elucidated by numerical simulations, enabling a comprehensive understanding of the process. These results answer key questions and establish methods for use in upcoming experiments to create an electron-positron plasma in a levitated dipole device.
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Affiliation(s)
- E V Stenson
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
- Technische Universität München, 85748 Garching, Germany
- University of California, San Diego, La Jolla, California 92093, USA
| | - S Nißl
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
- Technische Universität München, 85748 Garching, Germany
| | - U Hergenhahn
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
- Leibniz Institute of Surface Engineering (IOM), 04318 Leipzig, Germany
| | - J Horn-Stanja
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
| | - M Singer
- Technische Universität München, 85748 Garching, Germany
| | - H Saitoh
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
- The University of Tokyo, 277-8561 Kashiwa, Japan
| | - T Sunn Pedersen
- Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany and 85748 Garching, Germany
- University of Greifswald, 17489 Greifswald, Germany
| | - J R Danielson
- University of California, San Diego, La Jolla, California 92093, USA
| | | | - M Dickmann
- Technische Universität München, 85748 Garching, Germany
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Horn-Stanja J, Nißl S, Hergenhahn U, Sunn Pedersen T, Saitoh H, Stenson EV, Dickmann M, Hugenschmidt C, Singer M, Stoneking MR, Danielson JR. Confinement of Positrons Exceeding 1 s in a Supported Magnetic Dipole Trap. Phys Rev Lett 2018; 121:235003. [PMID: 30576209 DOI: 10.1103/physrevlett.121.235003] [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] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Indexed: 06/09/2023]
Abstract
An ensemble of low-energy positrons injected into a supported magnetic dipole trap can remain trapped for more than a second. Trapping experiments with and without a positive magnet bias yield confinement times up to τ_{A}=(1.5±0.1) and τ_{B}=(0.28±0.04) s, respectively. Supported by single-particle simulations, we conclude that the dominant mechanism limiting the confinement in this trap is scattering off of neutrals, which can lead to both radial transport and parallel losses onto the magnet surface. These results provide encouragement for plans to confine an electron-positron plasma in a levitated dipole trap.
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Affiliation(s)
- J Horn-Stanja
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
| | - S Nißl
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
- Technische Universität München, Garching 85748, Germany
| | - U Hergenhahn
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
- Leibniz Institute of Surface Engineering (IOM), Leipzig 04318, Germany
| | - T Sunn Pedersen
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
- University of Greifswald, Greifswald 17489, Germany
| | - H Saitoh
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
- The University of Tokyo, Kashiwa 277-8561, Japan
| | - E V Stenson
- Max Planck Institute for Plasma Physics, Garching 85748, Germany and Greifswald 17491, Germany
- Technische Universität München, Garching 85748, Germany
- University of California, San Diego, La Jolla, California 92093, USA
| | - M Dickmann
- Technische Universität München, Garching 85748, Germany
| | | | - M Singer
- Technische Universität München, Garching 85748, Germany
| | | | - J R Danielson
- University of California, San Diego, La Jolla, California 92093, USA
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Kubota M, Harada Y, Saitoh H, Yamaguchi C, Omura M. Longitudinal nutritional assessment in hospitalized patients with head and neck cancer. Clin Nutr 2018. [DOI: 10.1016/j.clnu.2018.06.1709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mursawa H, Hatakeyama S, Yamamoto H, Tanaka Y, Soma O, Matsumoto T, Yoneyama T, Hashimoto Y, Koie T, Fujita T, Murakami R, Saitoh H, Suzuki T, Narumi S, Ohyama C. Slow Progression of Aortic Calcification Is a Potential Benefit of Pre-emptive Kidney Transplantation. Transplant Proc 2018; 50:145-149. [PMID: 29407299 DOI: 10.1016/j.transproceed.2017.12.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 12/05/2017] [Indexed: 11/30/2022]
Abstract
PURPOSE Pre-emptive kidney transplantation (PKT) is expected to improve graft and cardiovascular event-free survival compared with standard kidney transplantation. Aortic calcification is reported to be closely associated with renal dysfunction and cardiovascular events; however, its implication in PKT recipients remains incompletely explored. This aim of this study was to evaluate whether PKT confers a protective effect on aortic calcification, renal function, graft survival, and cardiovascular event-free survival. METHODS One hundred adult patients who underwent renal transplantation between January 1996 and March 2016 at Hirosaki University Hospital and Oyokyo Kidney Research Institute were included. Among them, 19 underwent PKT and 81 patients underwent pretransplant dialysis. We retrospectively compared pretransplant and post-transplant aortic calcification index (ACI), renal function (estimated glomerular filtration rate [eGFR]), and graft and cardiovascular event-free survivals between the 2 groups. RESULTS The median age of this cohort was 45 years. Preoperative ACI was significantly lower in PKT recipients. There were no significant differences between the 2 groups regarding postoperative eGFR, graft survival, and cardiovascular event-free survival. However, the ACI progression rate (ΔACI/y) was significantly lower in PKT recipients than in those who underwent pretransplant dialysis. Higher ACI was significantly associated with poor cardiovascular event-free survival. CONCLUSIONS PKT is beneficial in that it contributes to the slow progression of after transplantation. Although we could not observe significant differences in graft and cardiovascular event-free survivals between the 2 groups, slow progression of aortic calcification showed a potential to decrease cardiovascular events in PKT recipients during long-term follow-up.
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Affiliation(s)
- H Mursawa
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - S Hatakeyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
| | - H Yamamoto
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y Tanaka
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - O Soma
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Matsumoto
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Yoneyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y Hashimoto
- Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Koie
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Fujita
- Departments of Cardiology, Respiratory Medicine, and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - R Murakami
- Departments of Cardiology, Respiratory Medicine, and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - H Saitoh
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - T Suzuki
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - S Narumi
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - C Ohyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan; Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Hamano I, Hatakeyama S, Yamamoto H, Fujita T, Murakami R, Shimada M, Imai A, Yoneyama T, Yoneyama T, Hashimoto Y, Koie T, Narumi S, Saitoh H, Suzuki T, Tomita H, Ohyama C. Condyloma Acuminata of the Urethra in a Male Renal Transplant Recipient: A Case Report. Transplant Proc 2018; 50:2553-2557. [PMID: 30316397 DOI: 10.1016/j.transproceed.2018.02.182] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 02/19/2018] [Indexed: 12/23/2022]
Abstract
BACKGROUND Condyloma acuminatum (CA) is a common sexually transmitted disease associated with human papilloma virus (HPV). CA occurring in the urethra is rare and has not been reported in male renal transplant recipients. In addition, despite immunosuppressive conditions and increased risk of HPV-related malignant neoplasms in transplant recipients, HPV testing in male transplant recipients has been uncommon. Here we report a case of urethral CA in a male deceased donor renal transplantation recipient and discuss the importance of HPV testing in male transplant recipients. CASE PRESENTATION A 33-year-old male deceased donor renal transplant recipient presented with miction pain 5 years after the transplantation. He reported repeated urinary tract infections with no sexual contact since the renal transplantation. Multiple papillary tumors in his penile urethra were detected by cystoscopy, and a biopsy sample was pathologically diagnosed with CA. Transurethral tumor resection was performed, and the tumors were completely resected. Additional HPV risk type screening with a urethral smear sample showed the prevalence of low-risk HPV. Although tacrolimus was switched to everolimus and imiquimod cream was administered, the tumors recurred 6 months after the resection, and a second resection was performed. No further recurrence has been observed for 1 year to date. CONCLUSION As the urethral CA was possibly related to immunosuppressive conditions and a risk for HPV-related malignant neoplasm, the case required careful diagnosis, including HPV risk type. The methodology of sampling for HPV testing in men has not been established. This case suggests the necessity for further discussion about HPV testing in male transplant recipients.
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Affiliation(s)
- I Hamano
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - S Hatakeyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
| | - H Yamamoto
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Fujita
- Department of Cardiology and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - R Murakami
- Department of Cardiology and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - M Shimada
- Department of Cardiology and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - A Imai
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Yoneyama
- Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Yoneyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y Hashimoto
- Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Koie
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - S Narumi
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - H Saitoh
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - T Suzuki
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - H Tomita
- Department of Cardiology and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - C Ohyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan; Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Saitoh H, Yokoshima T, Kishida H, Hayakawa H, Cohen RJ, Osaka M. Nonlinear Pattern Analysis of Ventricular Premature Beats by Mutual Information. Methods Inf Med 2018. [DOI: 10.1055/s-0038-1636872] [Citation(s) in RCA: 1] [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: 10/17/2022]
Abstract
Abstract:The frequency of ventricular premature beats (VPBs) has been related to the risk of mortality. However, little is known about the temporal pattern of occurrence of VPBs and its relationship to autonomic activity. Hence, we applied a general correlation measure, mutual information, to quantify how VPBs are generated over time. We also used mutual information to determine the correlation between VPB production and heart rate in order to evaluate effects of autonomic activity on VPB production. We examined twenty subjects with more than 3000 VPBs/day and simulated ran-( dom time series of VPB occurrence. We found that mutual information values could be used to characterize quantitatively the temporal patterns of VPB generation. Our data suggest that VPB production is not random and VPBs generated with a higher value of mutual information may be more greatly affected by autonomic activity.
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Yoshida Z, Ogawa Y, Morikawa J, Furukawa M, Saitoh H, Hirota M, Hori D, Shiraishi J, Watanabe S, Numazawa S, Yano Y, Suzuki J. RT-1 Project: Magnetosphere-Like Plasma Experiment. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Z. Yoshida
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Y. Ogawa
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - J. Morikawa
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - M. Furukawa
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - H. Saitoh
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - M. Hirota
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - D. Hori
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - J. Shiraishi
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S. Watanabe
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S. Numazawa
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Y. Yano
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - J. Suzuki
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Nishiura M, Yoshida Z, Mushiake T, Kawazura Y, Osawa R, Fujinami K, Yano Y, Saitoh H, Yamasaki M, Kashyap A, Takahashi N, Nakatsuka M, Fukuyama A. Electro-optic probe measurements of electric fields in plasmas. Rev Sci Instrum 2017; 88:023501. [PMID: 28249485 DOI: 10.1063/1.4974740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The direct measurements of high-frequency electric fields in a plasma bring about significant advances in the physics and engineering of various waves. We have developed an electro-optic sensor system based on the Pockels effect. Since the signal is transmitted through an optical fiber, the system has high tolerance for electromagnetic noises. To demonstrate its applicability to plasma experiments, we report the first result of measurement of the ion-cyclotron wave excited in the RT-1 magnetosphere device. This study compares the results of experimental field measurements with simulation results of electric fields in plasmas.
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Affiliation(s)
- M Nishiura
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - Z Yoshida
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - T Mushiake
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - Y Kawazura
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - R Osawa
- SEIKOH GIKEN Co., Ltd., Matsudo, Chiba 270-2214, Japan
| | - K Fujinami
- SEIKOH GIKEN Co., Ltd., Matsudo, Chiba 270-2214, Japan
| | - Y Yano
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - H Saitoh
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - M Yamasaki
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - A Kashyap
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - N Takahashi
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - M Nakatsuka
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan
| | - A Fukuyama
- Department of Nuclear Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan
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13
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Ishii N, Makino Y, Fujita M, Sakuma A, Torimitsu S, Chiba F, Yajima D, Inokuchi G, Motomura A, Iwase NH, Saitoh H. Assessing age-related change in Japanese mental foramen opening direction using multidetector computed tomography. J Forensic Odontostomatol 2016; 34:11-20. [PMID: 28520560 PMCID: PMC6035759] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE The purpose of this study was to investigate how the opening direction of the mental foramen (MF) changes with age in a Japanese population using multi-detector computed tomography (MDCT). METHODS Post-mortem MDCT scans of 121 Japanese subjects (66 males and 55 females) were carried out where all subjects possessed at least twenty teeth, including molar teeth, in the upper and lower jaws. Two angles of the mental foramen opening were measured, namely the superior-inferior angle in the coronal plane and anterior-posterior angle in the transverse plane, on the CT reconstructed images. The associations between age and these two angles were evaluated using a multiple regression analysis. RESULTS For male subjects, the relationship between the superior-inferior angle and age was a quadratic curve (p < 0.001). This angle increased until the subject reached their early 50s and then the angle decreased with age. In the transverse plane, there was a linear relation between the anterior-posterior angle and age (p=0.002).It was noted also that the angle decreased with age. By contrast, however, no significant associations between the two angles and age for either measurement were noted for female subjects. This study demonstrated that the opening direction of the mental foramen changes with age in Japanese male subjects. By contrast this change in the opening direction of the mental foramen was not demonstrated in Japanese female subjects. In male subjects, the opening direction moves superiorly until the individual reaches their early 50s, and then moves inferiorly with advancing age. It also shifts from a posterior to an anterior position with age. CONCLUSION These observed change differ from the results of previous studies. The findings could be useful for forensic science as they demonstrate a change in the position of mental foramen in a sample of contemporaneous male Japanese subjects.
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Affiliation(s)
- N Ishii
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - Y Makino
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - M Fujita
- Department of Public Health, Graduate School of Medicine, Chiba University, Japan
| | - A Sakuma
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - S Torimitsu
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - F Chiba
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - D Yajima
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - G Inokuchi
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - A Motomura
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - N H Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
| | - H Saitoh
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Japan
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Saitoh H, Yoshida Z, Yano Y, Nishiura M, Kawazura Y, Horn-Stanja J, Pedersen TS. Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme. Phys Rev E 2016; 94:043203. [PMID: 27841504 DOI: 10.1103/physreve.94.043203] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Indexed: 11/07/2022]
Abstract
We study the behavior of high-energy positrons emitted from a radioactive source in a magnetospheric dipole field configuration. Because the conservation of the first and second adiabatic invariants is easily destroyed in a strongly inhomogeneous dipole field for high-energy charged particles, the positron orbits are nonintegrable, resulting in chaotic motions. In the geometry of a typical magnetospheric levitated dipole experiment, it is shown that a considerable ratio of positrons from a ^{22}Na source, located at the edge of the confinement region, has chaotic long orbit lengths before annihilation. These particles make multiple toroidal circulations and form a hollow toroidal positron cloud. Experiments with a small ^{22}Na source in the Ring Trap 1 (RT-1) device demonstrated the existence of such long-lived positrons in a dipole field. Such a chaotic behavior of high-energy particles is potentially applicable to the formation of a dense toroidal positron cloud in the strong-field region of the dipole field in future studies.
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Affiliation(s)
- H Saitoh
- Max Planck Institute for Plasma Physics, Boltzmannstraße 2, D-85748 Garching and Wendelsteinstraße 1, D-17491 Greifswald, Germany.,Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Z Yoshida
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Y Yano
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - M Nishiura
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Y Kawazura
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - J Horn-Stanja
- Max Planck Institute for Plasma Physics, Boltzmannstraße 2, D-85748 Garching and Wendelsteinstraße 1, D-17491 Greifswald, Germany
| | - T Sunn Pedersen
- Max Planck Institute for Plasma Physics, Boltzmannstraße 2, D-85748 Garching and Wendelsteinstraße 1, D-17491 Greifswald, Germany.,Ernst Moritz-Arndt University Greifswald, Domstraße 11, 17489 Greifswald, Germany
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Chang W, Koba Y, Katayose T, Hariu M, Yasui K, Saitoh H. SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam. Med Phys 2016. [DOI: 10.1118/1.4956312] [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: 11/07/2022] Open
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Oikawa M, Hatakeyama S, Narita T, Yamamoto H, Hosogoe S, Imai A, Yoneyama T, Hashimoto Y, Koie T, Fujita T, Murakami R, Saitoh H, Funyu T, Narumi S, Ohyama C. Safety and Effectiveness of Marginal Donor in Living Kidney Transplantation. Transplant Proc 2016; 48:701-5. [DOI: 10.1016/j.transproceed.2015.09.067] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 08/21/2015] [Accepted: 09/15/2015] [Indexed: 10/21/2022]
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Maqbool A, Saitoh H, Franceschetti M, Stevenson CEM, Uemura A, Kanzaki H, Kamoun S, Terauchi R, Banfield MJ. Structural basis of pathogen recognition by an integrated HMA domain in a plant NLR immune receptor. eLife 2015; 4:e08709. [PMID: 26304198 PMCID: PMC4547098 DOI: 10.7554/elife.08709] [Citation(s) in RCA: 176] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 07/24/2015] [Indexed: 12/31/2022] Open
Abstract
Plants have evolved intracellular immune receptors to detect pathogen proteins known as effectors. How these immune receptors detect effectors remains poorly understood. Here we describe the structural basis for direct recognition of AVR-Pik, an effector from the rice blast pathogen, by the rice intracellular NLR immune receptor Pik. AVR-PikD binds a dimer of the Pikp-1 HMA integrated domain with nanomolar affinity. The crystal structure of the Pikp-HMA/AVR-PikD complex enabled design of mutations to alter protein interaction in yeast and in vitro, and perturb effector-mediated response both in a rice cultivar containing Pikp and upon expression of AVR-PikD and Pikp in the model plant Nicotiana benthamiana. These data reveal the molecular details of a recognition event, mediated by a novel integrated domain in an NLR, which initiates a plant immune response and resistance to rice blast disease. Such studies underpin novel opportunities for engineering disease resistance to plant pathogens in staple food crops.
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Affiliation(s)
- A Maqbool
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
| | - H Saitoh
- Iwate Biotechnology Research Center, Kitakami, Japan
| | - M Franceschetti
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
| | - CEM Stevenson
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
| | - A Uemura
- Iwate Biotechnology Research Center, Kitakami, Japan
| | - H Kanzaki
- Iwate Biotechnology Research Center, Kitakami, Japan
| | - S Kamoun
- The Sainsbury Laboratory, Norwich, United Kingdom
| | - R Terauchi
- Iwate Biotechnology Research Center, Kitakami, Japan
| | - MJ Banfield
- Department of Biological Chemistry, John Innes Centre, Norwich, United Kingdom
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Imanishi K, Hatakeyama S, Yamamoto H, Okamoto A, Imai A, Yoneyama T, Hashimoto Y, Koie T, Fujita T, Murakami R, Saitoh H, Funyu T, Narumi S, Ohyama C. Post-transplant renal function and cardiovascular events are closely associated with the aortic calcification index in renal transplant recipients. Transplant Proc 2014; 46:484-8. [PMID: 24655995 DOI: 10.1016/j.transproceed.2013.09.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 09/20/2013] [Indexed: 12/21/2022]
Abstract
INTRODUCTION The aortic calcification index (ACI) is reported to be closely associated with renal dysfunction and cardiovascular events; however, its implication in renal transplant recipients has not been well examined. In this study, we investigated the relationship between pretransplant ACI, ACI progression, post-transplant renal function, and post-transplant cardiovascular events in renal transplant recipients. PATIENTS AND METHODS The study from June 1996 to Jan 2012 included 61 renal transplant recipients (living donors, 47; cadaveric donors, 14). The median follow-up period was 60 months. ACI was quantitatively measured on abdominal computed tomography. The relationship between age, dialysis period, estimated glomerular filtration rate (eGFR), and pre- and post-transplant ACI was longitudinally evaluated. Risk factors for post-transplant ACI progression were determined by logistic regression analysis. Patient background and the incidence of post-transplant cardiovascular events were also assessed. RESULTS The pretransplant ACI (median 4.2%) significantly correlated with age at transplant, dialysis period, and diabetes mellitus. ACI gradually increased up to 2.8 times at 10 years after transplantation. Post-transplant eGFR significantly correlated with ACI progression in patients with chronic kidney disease of stage ≥ 3. Logistic regression analyses showed that age at transplantation, post-transplant period, cadaveric donors, and post-transplant chronic kidney disease stage 3 were risk factors for post-transplant ACI progression. The pretransplant ACI was higher (median 66%) in 3 patients who experienced post-transplant cardiovascular events. CONCLUSIONS ACI progression closely correlates with age and post-transplant renal function. A high pretransplant ACI is a risk factor for post-transplant cardiovascular events in renal transplant recipients.
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Affiliation(s)
- K Imanishi
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - S Hatakeyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
| | - H Yamamoto
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - A Okamoto
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - A Imai
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Yoneyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y Hashimoto
- Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Koie
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T Fujita
- Department of Cardiology, Respiratory Medicine and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - R Murakami
- Department of Cardiology, Respiratory Medicine and Nephrology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - H Saitoh
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - T Funyu
- Department of Urology, Oyokyo Kidney Research Institute, Hirosaki, Japan
| | - S Narumi
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - C Ohyama
- Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan; Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Sakuma A, Makino Y, Saitoh H, Chiba F, Ishii N, Iwase H. Evaluation of a personal identification method using the fusion function of CT images and dental radiographs. Dentomaxillofac Radiol 2014; 44:20140137. [PMID: 25270062 DOI: 10.1259/dmfr.20140137] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES We applied the fusion function of dental analysis software to examine whether the anatomical relationships of tooth roots when compared between reconstructed post-mortem CT (PMCT) and dental radiographs can aid dental identification. METHODS One PMCT image taken from a cadaver (43-year-old male; Cadaver 1) was compared with 64 digital dental radiographs of the left and right upper and lower molars from Cadaver 1 and 30 other cadavers. Five corresponding anatomical reference points were marked on each image. After adjusting the angle and magnification using the fusion function, the automatically calculated error in pixels was determined five times for each of four sites on the images. RESULTS Comparison of the PMCT image with the dental radiographs from the other cadavers revealed obvious discrepancies in the anatomical positioning of the teeth. When t-tests were applied to the data from any of the four sites, the error in pixels was found to be significantly smaller (p < 0.001) between Cadaver 1 and the other cadaver images. The average error in pixels between the PMCT and dental radiographs was smaller in the lower jaw than in the upper jaw. CONCLUSIONS This method uses corresponding reference points on two images to calculate the error between the regions that contain all points. This feature also makes it possible to compare images taken with different modalities. The demand for a dental identification method involving PMCT is likely to increase, and we expect that the accuracy of dental identification will improve by using radiological images.
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Affiliation(s)
- A Sakuma
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
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Tohyama N, Kodama T, Kawachi T, Kojima T, Saitoh H, Hatano K. EP-1223: Dosimetric comparison between Acuros XB and model-based algorithm for prostate IMRT with implanted fiducial marker. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33529-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Tohyama N, hashimoto S, Minemura T, Fujita Y, Kawachi T, Kojima T, Hatano K, Nakamura K, Saitoh H, Ishikura S. Validation of IMRT Postal Dosimetry Audit Using Radiophotoluminescence Glass Dosimeter. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Sakuma A, Saitoh H, Makino Y, Inokuchi G, Hayakawa M, Yajima D, Iwase H. Three-dimensional visualization of composite fillings for dental identification using CT images. Dentomaxillofac Radiol 2012; 41:515-9. [PMID: 22868297 DOI: 10.1259/dmfr/13441277] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES This study aimed to discriminate between enamel and composite resins by differences in Hounsfield units shown on 16 section multidetector CT (MDCT) images taken of unidentified bodies. METHODS First, we determined the Hounsfield units of composite resins in 15 extracted human teeth. We then filled a single cavity prepared in each of the teeth with one of five different types of composite resins, and scanned the teeth using our routine post-mortem CT protocol for the head and neck. Obtained data were transferred to a radiological workstation and reconstructed. Furthermore, post-mortem CT images of the head of three unidentified bodies were reconstructed in the same manner. RESULTS Four types of composite resins containing radio-opaque fillers showed a constant value of 4000 HU, and one radiolucent composite resin showed values in the range of 660-800 HU in the extracted teeth. Pixels at 4000 HU indicated that the composite resins were selected and visualized as three-dimensional colour images. Composite resins could be visualized on reconstructed images of the three unidentified bodies, and the sites visualized matched those noted on the forensic dental charts. CONCLUSIONS Discriminating enamel and composite resins containing radio-opaque materials was difficult because of their similar Hounsfield unit values. However, we did succeed in visualizing the composite resins despite limitations of the CT scale. CT reconstructed images can contribute to dental identification, particularly in cases where it is difficult to detect composite resins on external investigation, and these images can be prepared during routine dental identification work.
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Affiliation(s)
- A Sakuma
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Japan.
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Matsubara K, Kohno R, Nishioka S, Shibuya T, Ariji T, Akimoto T, Saitoh H. SU-E-J-31: Direct Point Dose Verification Using IGRT for Actual Beam Delivery. Med Phys 2012; 39:3659. [DOI: 10.1118/1.4734864] [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: 11/07/2022] Open
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Hashimoto S, Karasawa K, Kito S, Nihei K, Kawachi T, Katayose T, Fujita Y, Saitoh H. EP-1329 MONTE CARLO SIMULATION OF RADIOPHOTOLUMINESCENCE DOSIMETER FOR DOSE MEASUREMENT OF LUNG SBRT. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71662-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Siddiqi UR, Punpunich W, Chuchottaworn C, Jindakul S, Ashino Y, Saitoh H, Okada M, Chotpittayasunondh T, Hattori T. Elevated anti-tuberculous glycolipid antibody titres in healthy adults and tuberculosis patients in Thailand. Int J Tuberc Lung Dis 2012; 16:532-8. [DOI: 10.5588/ijtld.10.0764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- U. R. Siddiqi
- Division of Emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan; Department of Physiology, Khulna Medical College, Khulna, Bangladesh
| | - W. Punpunich
- Queen Sirikrit National Institute of Child Health, Department of Paediatrics, College of Medicine, Rangsit University, Bangkok, Thailand
| | | | - S. Jindakul
- Queen Sirikrit National Institute of Child Health, Department of Paediatrics, College of Medicine, Rangsit University, Bangkok, Thailand
| | - Y. Ashino
- Division of Emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan
| | - H. Saitoh
- Division of Emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan
| | - M. Okada
- Clinical Research Center, National Hospital Organization Kinki-Chuo Chest Medical Center, Osaka, Japan
| | - T. Chotpittayasunondh
- Queen Sirikrit National Institute of Child Health, Department of Paediatrics, College of Medicine, Rangsit University, Bangkok, Thailand
| | - T. Hattori
- Division of Emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan
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Hatakeyama S, Fujita T, Yoneyama T, Yoneyama T, Koie T, Hashimoto Y, Saitoh H, Funyu T, Narumi S, Ohyama C. A Switch From Conventional Twice-Daily Tacrolimus to Once-Daily Extended-Release Tacrolimus in Stable Kidney Transplant Recipients. Transplant Proc 2012; 44:121-3. [DOI: 10.1016/j.transproceed.2011.11.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Liebermann J, Pelts E, Matthews J, Sanchez S, Brohammer B, Wagner Y, Sipe C, Feinberg E, Lederer K, Beltsos A, Veleva Z, Tapanainen JS, Martikainen H, Sullivan EA, Wang YA, Malchau S, Loft A, Rasmusen S, Larsen EC, Nyboe Andersen A, Pinborg A, Fedder J, Loft A, Parner ET, Rasmussen S, Pinborg A, Kuwahara A, Saitoh H, Ishihara O, Irahara M, Delrieu D, Himaya E, Saumet J, Dzineku F, Phillips S, Velez MP, Kadoch IJ. SESSION 63: ESET AND PERINATAL OUTCOME. Hum Reprod 2012. [DOI: 10.1093/humrep/27.s2.62] [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: 11/12/2022] Open
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Katayama Y, Ikeda T, Hattori T, Saitoh H, Aoki K, Fukui H, Tange Y, Funakoshi K. Structure of water under high temperature and pressure. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311095869] [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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Katayama Y, Saitoh H, Aoki K. Structure of liquid transition metal hydrogen alloys under high pressure. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311082699] [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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Tohyama N, Hashimoto S, Fujita Y, Minemura T, Kurooka M, Kumazaki Y, Kawachi T, Kojima T, Kodama T, Hatano K, Ishikura S, Saitoh H. SU-E-T-80: Development of IMRT Postal Audit Phantom Using Radiophotoluminescence Glass Dosimeter. Med Phys 2011. [DOI: 10.1118/1.3612031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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31
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Chang W, Kadoya N, Hashimoto S, Fujita Y, Kato T, Saitoh H. SU-E-T-124: Feasubility Study of Absorbed Dose Estimation Using Radiophotoluminescence Glass Dosimeter for Proton Therapeutic Beam. Med Phys 2011. [DOI: 10.1118/1.3612075] [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: 11/07/2022] Open
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Iseki K, Hirano T, Fukushi Y, Kitamura Y, Miyazaki S, Takada M, Sugawara M, Saitoh H, Miyazaki K. The pH Dependent Uptake of Enoxacin by Rat Intestinal Brush-border Membrane Vesicles. J Pharm Pharmacol 2011; 44:722-6. [PMID: 1360522 DOI: 10.1111/j.2042-7158.1992.tb05507.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Abstract
The mechanism of the intestinal transport of enoxacin, an orally active fluoroquinolone antibiotic, has been investigated using brush-border membrane vesicles isolated from rat small intestine. The initial rate and time-course of enoxacin uptake were considerably dependent upon the medium pH (pH 5·5 > pH 7·5) and upon the percent ionization of the carboxyl group (pKa 6·2, anionic charge), namely, the degree of uptake of cationic form was higher than that of the zwitterionic form. There was evidence of transport into the intravesicular space as shown by the effect of extravesicular medium osmolarity on enoxacin uptake at steady state (30 min). This transport across the brush-border membrane was stimulated by the valinomycin-induced K+-diffusion potential (interior negative) and an outward H+-diffusion potential. Furthermore, changing the pH of the medium from 5·5 to 7·5 significantly decreased the effect of valinomycin-induced K+-diffusion potential on the enoxacin uptake. These results suggest that the uptake behaviour of the cationic form of enoxacin plays an important role in the intestinal absorption process of enoxacin.
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Affiliation(s)
- K Iseki
- Department of Pharmacy, Hokkaido University Hospital, School of Medicine, Sapporo, Japan
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Brazhkin VV, Farnan I, Funakoshi KI, Kanzaki M, Katayama Y, Lyapin AG, Saitoh H. Structural transformations and anomalous viscosity in the B2O3 melt under high pressure. Phys Rev Lett 2010; 105:115701. [PMID: 20867586 DOI: 10.1103/physrevlett.105.115701] [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: 06/22/2010] [Indexed: 05/29/2023]
Abstract
Liquid B2O3 represents an archetypical oxide melt with a superhigh viscosity at the melting temperature. We present the results of the in situ x-ray diffraction study and the in situ viscosity measurements of liquid B2O3 under high pressure up to 8 GPa. Additionally, the 11B solid state NMR spectroscopy study of B2O3 glasses quenched from the melt at five different pressures has been carried out. Taken together, the results obtained provide understanding of the nature of structural transformations in liquid B2O3. The fraction of the boroxol rings in the melt structure rapidly decreases with pressure. From pressures of about 4.5 GPa, four-coordinated boron states begin to emerge sharply, reaching the fraction 40%-45% at 8 GPa. The viscosity of the B2O3 melt along the melting curve drops by 4 orders of magnitude as the pressure increases up to 5.5 GPa and remains unchanged on further pressure increase.
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Affiliation(s)
- V V Brazhkin
- Institute for High Pressure Physics RAS, 142190 Troitsk Moscow region, Russia.
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Saitoh H, Yoshida Z, Morikawa J, Yano Y, Mizushima T, Kobayashi M. Formation of High-β ECH Plasma and Inward Particle Diffusion in RT-1. J Fusion Energ 2010. [DOI: 10.1007/s10894-010-9327-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Miura M, Takahashi N, Nara M, Fujishima N, Kagaya H, Kameoka Y, Saitoh H, Tagawa H, Sawada K. A simple, sensitive high-performance liquid chromatography -ultraviolet method for the quantification of concentration and steady-state pharmacokinetics of itraconazole and hydroxyitraconazole. Ann Clin Biochem 2010; 47:432-9. [DOI: 10.1258/acb.2010.010029] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Background A steady-state trough plasma itraconazole concentration greater than 500 ng/mL is a therapeutic target for itraconazole. A simple, rapid and sensitive high-performance liquid chromatography-based method was developed for quantitation of itraconazole and hydroxyitraconazole in human plasma. Methods Itraconazole and hydroxyitraconazole were separated using a mobile phase of 0.5% KH2PO4 (pH 6.0)-acetonitrile (30:70, v/v) on a CAPCELLPAK C18 MGII column at a flow rate of 0.5 mL/min and ultraviolet absorbance at 260 nm. Results The analysis required 200 μL of plasma and involved a rapid, simple solid-phase extraction with an Oasis HLB cartridge, which resulted in recoveries of 87–92% for itraconazole and 91–94% for hydroxyitraconazole. The lower limit of quantification for itraconazole and hydroxyitraconazole was 5 ng/mL each. Intra- and interday coefficients of variation for itraconazole and hydroxyitraconazole were less than 11.3% and 12.2%, respectively, and accuracies were within 11.7% and 4.5% over the linear range, respectively. Although the steady-state plasma concentrations of itraconazole and hydroxyitraconazole ranged from 506 to 2482 ng/mL and from 766 to 2444 ng/mL, respectively, after a two-day loading dose of 400 mg/day intravenous itraconazole followed by the administration of 200 mg/day itraconazole oral solution, calibration curves of itraconazole and hydroxyitraconazole showed positive linearity in a concentration range of 5–2500 and 50–2500 ng/mL, respectively. Conclusions Our results indicate that this method is applicable for the monitoring of plasma levels of itraconazole and hydroxyitraconazole in a clinical setting. Furthermore, the regimen presented here might also be effective in preventing infection, but further studies with large sample sizes are necessary to investigate this avenue.
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Affiliation(s)
- M Miura
- Department of Pharmacy, Akita University Hospital, 1-1-1 Hondo, Akita 010-8543
| | - N Takahashi
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - M Nara
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - N Fujishima
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - H Kagaya
- Department of Pharmacy, Akita University Hospital, 1-1-1 Hondo, Akita 010-8543
| | - Y Kameoka
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - H Saitoh
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - H Tagawa
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
| | - K Sawada
- Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan
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Yoshida Z, Saitoh H, Morikawa J, Yano Y, Watanabe S, Ogawa Y. Magnetospheric vortex formation: self-organized confinement of charged particles. Phys Rev Lett 2010; 104:235004. [PMID: 20867249 DOI: 10.1103/physrevlett.104.235004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2010] [Indexed: 05/29/2023]
Abstract
A magnetospheric configuration gives rise to various peculiar plasma phenomena that pose conundrums to astrophysical studies; at the same time, innovative technologies may draw on the rich physics of magnetospheric plasmas. We have created a "laboratory magnetosphere" with a levitating superconducting ring magnet. Here we show that charged particles (electrons) self-organize a stable vortex, in which particles diffuse inward to steepen the density gradient. The rotating electron cloud is sustained for more than 300 s. Because of its simple geometry and self-organization, this system will have wide applications in confining single- and multispecies charged particles.
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Affiliation(s)
- Z Yoshida
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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37
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Hashimoto S, Fujita Y, Kawachi T, Tohyama N, Kojima T, Hayashi N, Kitou S, Kurooka M, Okamoto H, Kumazaki Y, Suzuki Y, Hatano K, Saitoh H. SU-GG-T-350: Beam Quality Correction of Radiophotoluminescence Glass Dosimeter in Accordance with Burlin Cavity Theory. Med Phys 2010. [DOI: 10.1118/1.3468747] [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: 11/07/2022] Open
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38
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Kojima T, Tohyama N, Kodama T, Kawachi T, Iwase T, Shimizu T, Uno J, Hatano K, Kurooka M, Saitoh H. SU-GG-T-207: Investigation of the Segmental- and Dynamic-IMRT Delivery Performance for Combination of Varian 21iX-S and CMS XiO Treatment Planning System. Med Phys 2010. [DOI: 10.1118/1.3468596] [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: 11/07/2022] Open
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Tohyama N, Kojima T, Kawachi T, Kurooka M, Kitou S, Okamoto H, Kumazaki Y, Hashimoto S, Fujita Y, Hayashi N, Hatano K, Saitoh H. SU-GG-T-204: Feasibility Study of On-Site IMRT Audit in Japan. Med Phys 2010. [DOI: 10.1118/1.4755941] [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: 11/07/2022] Open
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40
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Matsubara K, Kohno R, Honmatsu K, Kitou S, Kawashima M, Ogino T, Saitoh H. SU-GG-T-324: Experimental Evaluation of Dose Calculation Using Mega-Voltage Cone Beam CT with MOSFET Detector in an Anthropomorphic Phantom. Med Phys 2010. [DOI: 10.1118/1.3468720] [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: 11/07/2022] Open
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41
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Shimizu T, Hanasawa K, Sato K, Umeki M, Koga N, Naganuma T, Sato S, Shimonishi T, Ikeda T, Matsuno N, Ono S, Saitoh H, Satoh K, Otani Y, Endo Y, Eguchi Y, Tani T. The Clinical Significance of Serum Procalcitonin Levels following Direct Hemoperfusion with Polymyxin B-Immobilized Fiber Column in Septic Patients with Colorectal Perforation. Eur Surg Res 2008; 42:109-17. [DOI: 10.1159/000187169] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Accepted: 09/17/2008] [Indexed: 11/19/2022]
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42
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Saitoh H, Nakatsuka T. Hydrogen-bonded network structures of cocrystals of some naphthalenediol with pyrazine. Acta Crystallogr A 2008. [DOI: 10.1107/s010876730808728x] [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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43
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Saitoh H, Kitada K, Kobune M, Adachi W, Yazawa T, Ishikawa K, Hiranaga Y, Cho Y, Aoki K. Synthesis and characterization of Bi(Ni 0.5Ti 0.5)O 3. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308083220] [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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44
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Brazhkin VV, Katayama Y, Trachenko K, Tsiok OB, Lyapin AG, Artacho E, Dove M, Ferlat G, Inamura Y, Saitoh H. Nature of the structural transformations in B2O3 glass under high pressure. Phys Rev Lett 2008; 101:035702. [PMID: 18764264 DOI: 10.1103/physrevlett.101.035702] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Indexed: 05/26/2023]
Abstract
We study high-pressure polyamorphism of B2O3 glass using x-ray diffraction up to 10 GPa in the 300-700 K temperature range, in situ volumetric measurements up to 9 GPa, and first-principles simulations. Under pressure, glass undergoes two-stage transformations including a gradual increase of the first B-O (O-B) coordination numbers above 5 GPa. The fraction of boron atoms in the fourfold-coordinated state at P<10 GPa is smaller than was assumed from inelastic x-ray scattering spectroscopy data, but is considerably larger than was previously suggested by the classical molecular dynamics simulations. The observed transformations under both compression and decompression are broad in hydrostatic conditions. On the basis of ab initio results, we also predict one more transformation to a superdense phase, in which B atoms are sixfold coordinated.
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Affiliation(s)
- V V Brazhkin
- Institute for High Pressure Physics RAS, 142190 Troitsk Moscow region, Russia.
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Inoue M, Matsumoto S, Tokuyasu N, Saitoh H, Tsujitani S, Ikeguchi M. Intraperitoneal administration of small interfering RNA targeting nuclear factor kappa B with paclitaxel successfully prolong the survival of murine xenograft with peritoneal metastasis of gastric cancer. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.14678] [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: 11/20/2022] Open
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46
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Brazhkin VV, Katayama Y, Kondrin MV, Hattori T, Lyapin AG, Saitoh H. AsS melt under pressure: one substance, three liquids. Phys Rev Lett 2008; 100:145701. [PMID: 18518048 DOI: 10.1103/physrevlett.100.145701] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 12/22/2007] [Indexed: 05/26/2023]
Abstract
An in situ high-temperature--high-pressure study of liquid chalcogenide AsS by x-ray diffraction, resistivity measurements, and quenching from melt is presented. The obtained data provide direct evidence for the existence in the melt under compression of two transformations: one is from a moderate-viscosity molecular liquid to a high-viscosity nonmetallic polymerized liquid at P approximately 1.6-2.2 GPa; the other is from the latter to a low-viscosity metallic liquid at P approximately 4.6-4.8 GPa. Upon rapid cooling, molecular and metallic liquids crystallize to normal and high-pressure phases, respectively, while a polymerized liquid is easily quenched to a new AsS glass. General aspects of multiple phase transitions in liquid AsS, including relations to the phase diagram of the respective crystalline, are discussed.
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Affiliation(s)
- V V Brazhkin
- Institute for High Pressure Physics, Russian Academy of Sciences, 142190, Troitsk Moscow region, Russia
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47
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Shimizu T, Sone M, Arai Y, Takeuchi Y, Morishita H, Higashihara H, Ohgi S, Inoue H, Ishiguchi T, Saitoh H, Sakaguchi H, Tanaka H, Shioyama Y, Tanigawa N. Abstract No. 148: Phase I/II Study of Uterine Artery Embolization (UAE) Using Gelatin Sponge (GS) (JIVROSG-0302). J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Saitoh H, Eguchi S, Maruyama Y, Kansaku R, Takae H, Sagawa N. [Preoperative pulseless electrical activity of acute type A aortic dissection; report of a case]. Kyobu Geka 2007; 60:1192-1195. [PMID: 18078089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An 80-year-old man with acute type A aortic dissection, who was preoperatively observed in the intensive care unit, suddenly became unresponsive. The patient was immediately intubated, but a pulse check was delayed because the cardiac monitor seemingly showed a normal sinus rhythm. Bedside echocardiography, while continuing cardiopulmonary resuscitation, revealed massive pericardial effusion. It indicated the patient's cardiac arrest was pulseless electrical activity (PEA) due to cardiac tamponade. After pericardiocentesis, a perfusion rhythm was restored with palpable distal pulse. He successfully underwent a prosthetic graft replacement of the ascending aorta and was discharged after physical rehabilitation.
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Affiliation(s)
- H Saitoh
- Department of Cardiovascular Surgery, Niigata Kobari Hospital, Niigata, Japan
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Brazhkin VV, Lyapin AG, Popova SV, Katayama Y, Saitoh H, Utsumi W. Molecular-network-ionic structure transitions in liquid AlCl(3) and ZnCl(2) halogenides under pressure. J Phys Condens Matter 2007; 19:246104. [PMID: 21694040 DOI: 10.1088/0953-8984/19/24/246104] [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] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present the in situ high-pressure-high-temperature x-ray diffraction study of the liquid AlCl(3) and ZnCl(2) halogenides having a quasi-molecular network structure in liquid state at normal pressure. These liquids are intermediate between pure covalent and ionic melts. Structural study of these liquid halogenides is indicative of a rapid and strong breakdown of an intermediate-range order in a tetrahedral network of melts for the initial pressure range, 0-2.5 GPa for AlCl(3) and 0-1.8 GPa for ZnCl(2), and points to rather sharp transitions in liquids with the formation of a short-range order structure similar to ionic melt structures around 4 GPa for AlCl(3) and 3 GPa for ZnCl(2). Thus, pseudo-covalent liquid halogenides like AlCl(3) and ZnCl(2) provide testimony to two phenomena under high pressures, namely, a gradual decay of structural correlations in the tetrahedral network of the melt and a sharp transition from molecular-network to ionic structure in liquid on further compression. Such a two-stage structural transformation under pressure is the general feature for a wide class of simple melts, including most of the pseudo-covalent halogenides.
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Affiliation(s)
- V V Brazhkin
- Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia
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50
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Fujishima N, Hirokawa M, Fujishima M, Yamashita J, Saitoh H, Ichikawa Y, Horiuchi T, Kawabata Y, Sawada KI. Skewed T cell receptor repertoire of Vdelta1(+) gammadelta T lymphocytes after human allogeneic haematopoietic stem cell transplantation and the potential role for Epstein-Barr virus-infected B cells in clonal restriction. Clin Exp Immunol 2007; 149:70-9. [PMID: 17425654 PMCID: PMC1942033 DOI: 10.1111/j.1365-2249.2007.03388.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The proliferation of Vdelta1(+) gammadelta T lymphocytes has been described in various infections including human immunodeficiency virus (HIV), cytomegalovirus (CMV) and malaria. However, the antigen specificity and functions of the human Vdelta1(+) T cells remain obscure. We sought to explore the biological role for this T cell subset by investigating the reconstitution of T cell receptor (TCR) repertoires of Vdelta1(+) gammadelta T lymphocytes after human allogeneic haematopoietic stem cell transplantation (HSCT). We observed skewed TCR repertoires of the Vdelta1(+) T cells in 27 of 44 post-transplant patients. Only one patient developed EBV-associated post-transplant lymphoproliferative disorder in the present patient cohort. The -WGI- amino acid motif was observed in CDR3 of clonally expanded Vdelta1(+) T cells in half the patients. A skew was also detected in certain healthy donors, and the Vdelta1(+) T cell clone derived from the donor mature T cell pool persisted in the recipient's blood even 10 years after transplant. This T cell clone expanded in vitro against stimulation with autologous EBV-lymphoblastoid cell lines (LCL), and the Vdelta1(+) T cell line expanded in vitro from the same patient showed cytotoxicity against autologous EBV-LCL. EBV-infected cells could also induce in vitro oligoclonal expansions of autologous Vdelta1(+) T cells from healthy EBV-seropositive individuals. These results suggest that human Vdelta1(+) T cells have a TCR repertoire against EBV-infected B cells and may play a role in protecting recipients of allogeneic HSCT from EBV-associated disease.
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Affiliation(s)
- N Fujishima
- Division of Hematology and Oncology, Department of Medicine, Akita University School of Medicine, Akita, Japan
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