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Cui Y, Hada K, Kawashima T, Kino M, Lin W, Mizuno Y, Ro H, Honma M, Yi K, Yu J, Park J, Jiang W, Shen Z, Kravchenko E, Algaba JC, Cheng X, Cho I, Giovannini G, Giroletti M, Jung T, Lu RS, Niinuma K, Oh J, Ohsuga K, Sawada-Satoh S, Sohn BW, Takahashi HR, Takamura M, Tazaki F, Trippe S, Wajima K, Akiyama K, An T, Asada K, Buttaccio S, Byun DY, Cui L, Hagiwara Y, Hirota T, Hodgson J, Kawaguchi N, Kim JY, Lee SS, Lee JW, Lee JA, Maccaferri G, Melis A, Melnikov A, Migoni C, Oh SJ, Sugiyama K, Wang X, Zhang Y, Chen Z, Hwang JY, Jung DK, Kim HR, Kim JS, Kobayashi H, Li B, Li G, Li X, Liu Z, Liu Q, Liu X, Oh CS, Oyama T, Roh DG, Wang J, Wang N, Wang S, Xia B, Yan H, Yeom JH, Yonekura Y, Yuan J, Zhang H, Zhao R, Zhong W. Precessing jet nozzle connecting to a spinning black hole in M87. Nature 2023; 621:711-715. [PMID: 37758892 DOI: 10.1038/s41586-023-06479-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 07/25/2023] [Indexed: 09/29/2023]
Abstract
The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner region of M87 revealed a wide opening angle for the jet originating near the black hole1-4. The Event Horizon Telescope resolved the central radio source and found an asymmetric ring structure consistent with expectations from general relativity5. With a baseline of 17 years of observations, there was a shift in the jet's transverse position, possibly arising from an 8- to 10-year quasi-periodicity3. However, the origin of this sideways shift remains unclear. Here we report an analysis of radio observations over 22 years that suggests a period of about 11 years for the variation in the position angle of the jet. We infer that we are seeing a spinning black hole that induces the Lense-Thirring precession of a misaligned accretion disk. Similar jet precession may commonly occur in other active galactic nuclei but has been challenging to detect owing to the small magnitude and long period of the variation.
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Affiliation(s)
- Yuzhu Cui
- Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hangzhou, China.
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.
- Astronomical Science Program, The Graduate University for Advanced Studies, Mitaka, Japan.
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan.
| | - Kazuhiro Hada
- Astronomical Science Program, The Graduate University for Advanced Studies, Mitaka, Japan
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
| | - Tomohisa Kawashima
- Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa, Japan
| | - Motoki Kino
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
- Kogakuin University of Technology & Engineering, Academic Support Center, Hachioji, Japan
| | - Weikang Lin
- South-Western Institute For Astronomy Research, Yunnan University, Kunming, China
| | - Yosuke Mizuno
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Frankfurt, Germany
| | - Hyunwook Ro
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- Department of Astronomy, Yonsei University, Seodaemun-gu, Republic of Korea
| | - Mareki Honma
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
- Department of Astronomy, Graduate School of Science, The University of Tokyo, Bunkyo, Japan
| | - Kunwoo Yi
- Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Republic of Korea
| | - Jintao Yu
- Department of Intelligence, Air Force Early Warning Academy, Wuhan, China
| | - Jongho Park
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Wu Jiang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Zhiqiang Shen
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | | | - Juan-Carlos Algaba
- Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Xiaopeng Cheng
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Ilje Cho
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- Instituto de Astrofísica de Andalucía - CSIC, Glorieta de la Astronomía s/n, Granada, Spain
| | - Gabriele Giovannini
- DIFA Bologna University, Bologna, Italy
- INAF-Istituto di Radioastronomia, Bologna, Italy
| | | | - Taehyun Jung
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- University of Science and Technology, Yuseong-gu, Republic of Korea
| | - Ru-Sen Lu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Kotaro Niinuma
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Japan
- The Research Institute for Time Studies, Yamaguchi University, Yamaguchi, Japan
| | - Junghwan Oh
- Joint Institute for VLBI ERIC, Dwingeloo, the Netherlands
| | - Ken Ohsuga
- Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan
| | | | - Bong Won Sohn
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- Department of Astronomy, Yonsei University, Seodaemun-gu, Republic of Korea
- University of Science and Technology, Yuseong-gu, Republic of Korea
| | - Hiroyuki R Takahashi
- Department of Natural Sciences, Faculty of Arts and Sciences, Komazawa University, Setagaya, Japan
| | - Mieko Takamura
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
- Department of Astronomy, Graduate School of Science, The University of Tokyo, Bunkyo, Japan
| | - Fumie Tazaki
- Tokyo Electron Technology Solutions Limited, Oshu City, Japan
| | - Sascha Trippe
- Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Republic of Korea
- SNU Astronomy Research Center, Seoul National University, Gwanak-gu, Republic of Korea
| | - Kiyoaki Wajima
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- University of Science and Technology, Yuseong-gu, Republic of Korea
| | - Kazunori Akiyama
- National Radio Astronomy Observatory, Charlottesville, VA, USA
- Massachusetts Institute of Technology Haystack Observatory, Westford, MA, USA
- Black Hole Initiative at Harvard University, Cambridge, MA, USA
| | - Tao An
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Keiichi Asada
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | | | - Do-Young Byun
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- University of Science and Technology, Yuseong-gu, Republic of Korea
| | - Lang Cui
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | | | - Tomoya Hirota
- Astronomical Science Program, The Graduate University for Advanced Studies, Mitaka, Japan
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
| | - Jeffrey Hodgson
- Department of Physics and Astronomy, Sejong University, Gwangjin-gu, Republic of Korea
| | - Noriyuki Kawaguchi
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
| | - Jae-Young Kim
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
- Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sang-Sung Lee
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- University of Science and Technology, Yuseong-gu, Republic of Korea
| | - Jee Won Lee
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Jeong Ae Lee
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | | | - Andrea Melis
- INAF - Osservatorio Astronomico di Cagliari, Selargius, CA, Italy
| | - Alexey Melnikov
- Institute of Applied Astronomy, Russian Academy of Sciences, St. Petersburg, Russia
| | - Carlo Migoni
- INAF - Osservatorio Astronomico di Cagliari, Selargius, CA, Italy
| | - Se-Jin Oh
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Koichiro Sugiyama
- National Astronomical Research Institute of Thailand (Public Organization), Chiangmai, Thailand
| | - Xuezheng Wang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Yingkang Zhang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Zhong Chen
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Ju-Yeon Hwang
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Dong-Kyu Jung
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Hyo-Ryoung Kim
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Jeong-Sook Kim
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
| | - Hideyuki Kobayashi
- Astronomical Science Program, The Graduate University for Advanced Studies, Mitaka, Japan
| | - Bin Li
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Guanghui Li
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Xiaofei Li
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Zhiyong Liu
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Qinghui Liu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Xiang Liu
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Chung-Sik Oh
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Tomoaki Oyama
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
| | - Duk-Gyoo Roh
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Jinqing Wang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Na Wang
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Shiqiang Wang
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Bo Xia
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Hao Yan
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Jae-Hwan Yeom
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | | | - Jianping Yuan
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Hua Zhang
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
| | - Rongbing Zhao
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
| | - Weiye Zhong
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing, China
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Lu RS, Asada K, Krichbaum TP, Park J, Tazaki F, Pu HY, Nakamura M, Lobanov A, Hada K, Akiyama K, Kim JY, Marti-Vidal I, Gómez JL, Kawashima T, Yuan F, Ros E, Alef W, Britzen S, Bremer M, Broderick AE, Doi A, Giovannini G, Giroletti M, Ho PTP, Honma M, Hughes DH, Inoue M, Jiang W, Kino M, Koyama S, Lindqvist M, Liu J, Marscher AP, Matsushita S, Nagai H, Rottmann H, Savolainen T, Schuster KF, Shen ZQ, de Vicente P, Walker RC, Yang H, Zensus JA, Algaba JC, Allardi A, Bach U, Berthold R, Bintley D, Byun DY, Casadio C, Chang SH, Chang CC, Chang SC, Chen CC, Chen MT, Chilson R, Chuter TC, Conway J, Crew GB, Dempsey JT, Dornbusch S, Faber A, Friberg P, García JG, Garrido MG, Han CC, Han KC, Hasegawa Y, Herrero-Illana R, Huang YD, Huang CWL, Impellizzeri V, Jiang H, Jinchi H, Jung T, Kallunki J, Kirves P, Kimura K, Koay JY, Koch PM, Kramer C, Kraus A, Kubo D, Kuo CY, Li CT, Lin LCC, Liu CT, Liu KY, Lo WP, Lu LM, MacDonald N, Martin-Cocher P, Messias H, Meyer-Zhao Z, Minter A, Nair DG, Nishioka H, Norton TJ, Nystrom G, Ogawa H, Oshiro P, Patel NA, Pen UL, Pidopryhora Y, Pradel N, Raffin PA, Rao R, Ruiz I, Sanchez S, Shaw P, Snow W, Sridharan TK, Srinivasan R, Tercero B, Torne P, Traianou E, Wagner J, Walther C, Wei TS, Yang J, Yu CY. A ring-like accretion structure in M87 connecting its black hole and jet. Nature 2023; 616:686-690. [PMID: 37100940 PMCID: PMC10132962 DOI: 10.1038/s41586-023-05843-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 02/14/2023] [Indexed: 04/28/2023]
Abstract
The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of [Formula: see text] Schwarzschild radii in diameter, approximately 50% larger than that seen at 1.3 mm. The outer edge at 3.5 mm is also larger than that at 1.3 mm. This larger and thicker ring indicates a substantial contribution from the accretion flow with absorption effects, in addition to the gravitationally lensed ring-like emission. The images show that the edge-brightened jet connects to the accretion flow of the black hole. Close to the black hole, the emission profile of the jet-launching region is wider than the expected profile of a black-hole-driven jet, suggesting the possible presence of a wind associated with the accretion flow.
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Affiliation(s)
- Ru-Sen Lu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, People's Republic of China.
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, People's Republic of China.
- Max-Planck-Institut für Radioastronomie, Bonn, Germany.
| | - Keiichi Asada
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC.
| | | | - Jongho Park
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Fumie Tazaki
- Simulation Technology Development Department, Tokyo Electron Technology Solutions, Oshu, Japan
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
| | - Hung-Yi Pu
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Department of Physics, National Taiwan Normal University, Taipei, Taiwan, ROC
- Center of Astronomy and Gravitation, National Taiwan Normal University, Taipei, Taiwan, ROC
| | - Masanori Nakamura
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Department of General Science and Education, National Institute of Technology, Hachinohe College, Hachinohe City, Japan
| | | | - Kazuhiro Hada
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan.
- Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Mitaka, Japan.
| | - Kazunori Akiyama
- Black Hole Initiative, Harvard University, Cambridge, MA, USA
- Massachusetts Institute of Technology Haystack Observatory, Westford, MA, USA
- National Astronomical Observatory of Japan, Mitaka, Japan
| | - Jae-Young Kim
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ivan Marti-Vidal
- Departament d'Astronomia i Astrofísica, Universitat de València, Valencia, Spain
- Observatori Astronòmic, Universitat de València, Valencia, Spain
| | - José L Gómez
- Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain
| | - Tomohisa Kawashima
- Institute for Cosmic Ray Research, The University of Tokyo, Chiba, Japan
| | - Feng Yuan
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, People's Republic of China
- Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai, People's Republic of China
- School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Eduardo Ros
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Walter Alef
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Silke Britzen
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Michael Bremer
- Institut de Radioastronomie Millimétrique, Saint Martin d'Hères, France
| | - Avery E Broderick
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
- Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, Ontario, Canada
- Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada
| | - Akihiro Doi
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
- Department of Space and Astronautical Science, The Graduate University for Advanced Studies, SOKENDAI, Sagamihara, Japan
| | - Gabriele Giovannini
- Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
- Istituto di Radio Astronomia, INAF, Bologna, Italy
| | | | - Paul T P Ho
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Mareki Honma
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Oshu, Japan
- Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Mitaka, Japan
- Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - David H Hughes
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Puebla, Mexico
| | - Makoto Inoue
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Wu Jiang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Motoki Kino
- National Astronomical Observatory of Japan, Mitaka, Japan
- Academic Support Center, Kogakuin University of Technology and Engineering, Hachioji, Japan
| | - Shoko Koyama
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Michael Lindqvist
- Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
| | - Jun Liu
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Alan P Marscher
- Institute for Astrophysical Research, Boston University, Boston, MA, USA
| | - Satoki Matsushita
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Hiroshi Nagai
- Department of Astronomical Science, The Graduate University for Advanced Studies, SOKENDAI, Mitaka, Japan
- National Astronomical Observatory of Japan, Mitaka, Japan
| | | | - Tuomas Savolainen
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
- Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland
- Metsähovi Radio Observatory, Aalto University, Kylmälä, Finland
| | | | - Zhi-Qiang Shen
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, People's Republic of China
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, People's Republic of China
| | | | | | - Hai Yang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, People's Republic of China
- School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | | | - Juan Carlos Algaba
- Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | | | - Uwe Bach
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | | | | | - Do-Young Byun
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
- University of Science and Technology, Daejeon, Republic of Korea
| | - Carolina Casadio
- Institute of Astrophysics, Foundation for Research and Technology, Heraklion, Greece
- Department of Physics, University of Crete, Heraklion, Greece
| | - Shu-Hao Chang
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Chih-Cheng Chang
- System Development Center, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC
| | - Song-Chu Chang
- System Development Center, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC
| | - Chung-Chen Chen
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Ming-Tang Chen
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Ryan Chilson
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | | | - John Conway
- Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
| | - Geoffrey B Crew
- Massachusetts Institute of Technology Haystack Observatory, Westford, MA, USA
| | - Jessica T Dempsey
- East Asian Observatory, Hilo, HI, USA
- ASTRON, Dwingeloo, The Netherlands
| | | | | | | | | | | | - Chih-Chiang Han
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Kuo-Chang Han
- System Development Center, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC
| | - Yutaka Hasegawa
- Graduate School of Science, Osaka Metropolitan University, Osaka, Japan
| | | | - Yau-De Huang
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Chih-Wei L Huang
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Violette Impellizzeri
- Leiden Observatory, University of Leiden, Leiden, The Netherlands
- National Radio Astronomy Observatory, Charlottesville, VA, USA
| | - Homin Jiang
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Hao Jinchi
- Electronic Systems Research Division, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC
| | - Taehyun Jung
- Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea
| | - Juha Kallunki
- Metsähovi Radio Observatory, Aalto University, Kylmälä, Finland
| | - Petri Kirves
- Metsähovi Radio Observatory, Aalto University, Kylmälä, Finland
| | | | - Jun Yi Koay
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Patrick M Koch
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Carsten Kramer
- Institut de Radioastronomie Millimétrique, Saint Martin d'Hères, France
| | - Alex Kraus
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | - Derek Kubo
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Cheng-Yu Kuo
- Department of Physics, National Sun Yat-Sen University, Kaohsiung City, Taiwan, ROC
| | - Chao-Te Li
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Lupin Chun-Che Lin
- Department of Physics, National Cheng Kung University, Tainan, Taiwan, ROC
| | - Ching-Tang Liu
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Kuan-Yu Liu
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Wen-Ping Lo
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Department of Physics, National Taiwan University, Taipei, Taiwan, ROC
| | - Li-Ming Lu
- System Development Center, National Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC
| | | | | | - Hugo Messias
- European Southern Observatory, Santiago, Chile
- Joint ALMA Observatory, Santiago, Chile
| | - Zheng Meyer-Zhao
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- ASTRON, Dwingeloo, The Netherlands
| | | | - Dhanya G Nair
- Astronomy Department, Universidad de Concepción, Concepción, Chile
| | - Hiroaki Nishioka
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Timothy J Norton
- Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA
| | - George Nystrom
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Hideo Ogawa
- Graduate School of Science, Osaka Metropolitan University, Osaka, Japan
| | - Peter Oshiro
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Nimesh A Patel
- Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA
| | - Ue-Li Pen
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Yurii Pidopryhora
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
- Argelander-Institut für Astronomie, Universität Bonn, Bonn, Germany
| | - Nicolas Pradel
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Philippe A Raffin
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - Ramprasad Rao
- Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA
| | - Ignacio Ruiz
- Institut de Radioastronomie Millimétrique, Granada, Spain
| | | | - Paul Shaw
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - William Snow
- Institute of Astronomy and Astrophysics, Academia Sinica, Hilo, HI, USA
| | - T K Sridharan
- National Radio Astronomy Observatory, Charlottesville, VA, USA
- Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA
| | - Ranjani Srinivasan
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
- Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA
| | | | - Pablo Torne
- Institut de Radioastronomie Millimétrique, Granada, Spain
| | - Efthalia Traianou
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
- Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain
| | - Jan Wagner
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
| | | | - Ta-Shun Wei
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
| | - Jun Yang
- Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
| | - Chen-Yu Yu
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan, ROC
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Psaltis D, Medeiros L, Christian P, Özel F, Akiyama K, Alberdi A, Alef W, Asada K, Azulay R, Ball D, Baloković M, Barrett J, Bintley D, Blackburn L, Boland W, Bower GC, Bremer M, Brinkerink CD, Brissenden R, Britzen S, Broguiere D, Bronzwaer T, Byun DY, Carlstrom JE, Chael A, Chan CK, Chatterjee S, Chatterjee K, Chen MT, Chen Y, Cho I, Conway JE, Cordes JM, Crew GB, Cui Y, Davelaar J, De Laurentis M, Deane R, Dempsey J, Desvignes G, Dexter J, Eatough RP, Falcke H, Fish VL, Fomalont E, Fraga-Encinas R, Friberg P, Fromm CM, Gammie CF, García R, Gentaz O, Goddi C, Gómez JL, Gu M, Gurwell M, Hada K, Hesper R, Ho LC, Ho P, Honma M, Huang CWL, Huang L, Hughes DH, Inoue M, Issaoun S, James DJ, Jannuzi BT, Janssen M, Jiang W, Jimenez-Rosales A, Johnson MD, Jorstad S, Jung T, Karami M, Karuppusamy R, Kawashima T, Keating GK, Kettenis M, Kim JY, Kim J, Kim J, Kino M, Koay JY, Koch PM, Koyama S, Kramer M, Kramer C, Krichbaum TP, Kuo CY, Lauer TR, Lee SS, Li YR, Li Z, Lindqvist M, Lico R, Liu J, Liu K, Liuzzo E, Lo WP, Lobanov AP, Lonsdale C, Lu RS, Mao J, Markoff S, Marrone DP, Marscher AP, Martí-Vidal I, Matsushita S, Mizuno Y, Mizuno I, Moran JM, Moriyama K, Moscibrodzka M, Müller C, Musoke G, Mus Mejías A, Nagai H, Nagar NM, Narayan R, Narayanan G, Natarajan I, Neri R, Noutsos A, Okino H, Olivares H, Oyama T, Palumbo DCM, Park J, Patel N, Pen UL, Piétu V, Plambeck R, PopStefanija A, Prather B, Preciado-López JA, Ramakrishnan V, Rao R, Rawlings MG, Raymond AW, Ripperda B, Roelofs F, Rogers A, Ros E, Rose M, Roshanineshat A, Rottmann H, Roy AL, Ruszczyk C, Ryan BR, Rygl KLJ, Sánchez S, Sánchez-Arguelles D, Sasada M, Savolainen T, Schloerb FP, Schuster KF, Shao L, Shen Z, Small D, Sohn BW, SooHoo J, Tazaki F, Tilanus RPJ, Titus M, Torne P, Trent T, Traianou E, Trippe S, van Bemmel I, van Langevelde HJ, van Rossum DR, Wagner J, Wardle J, Ward-Thompson D, Weintroub J, Wex N, Wharton R, Wielgus M, Wong GN, Wu Q, Yoon D, Young A, Young K, Younsi Z, Yuan F, Yuan YF, Zhao SS. Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole. Phys Rev Lett 2020; 125:141104. [PMID: 33064506 DOI: 10.1103/physrevlett.125.141104] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 08/31/2020] [Indexed: 06/11/2023]
Abstract
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new and clean gravitational test of the black-hole metric in the strong-field regime. We show analytically that spacetimes that deviate from the Kerr metric but satisfy weak-field tests can lead to large deviations in the predicted black-hole shadows that are inconsistent with even the current EHT measurements. We use numerical calculations of regular, parametric, non-Kerr metrics to identify the common characteristic among these different parametrizations that control the predicted shadow size. We show that the shadow-size measurements place significant constraints on deviation parameters that control the second post-Newtonian and higher orders of each metric and are, therefore, inaccessible to weak-field tests. The new constraints are complementary to those imposed by observations of gravitational waves from stellar-mass sources.
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Affiliation(s)
- Dimitrios Psaltis
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Lia Medeiros
- School of Natural Sciences, Institute for Advanced Study, 1 Einstein Drive, Princeton, New Jersey 08540, USA
| | - Pierre Christian
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Feryal Özel
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Kazunori Akiyama
- National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22903, USA
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
- National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Antxon Alberdi
- Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
| | - Walter Alef
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Keiichi Asada
- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Rebecca Azulay
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
- Departament d'Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, E-46100 Burjassot, València, Spain
- Observatori Astronmic, Universitat de València, C. Catedrático José Beltrán 2, E-46980 Paterna, València, Spain
| | - David Ball
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Mislav Baloković
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - John Barrett
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Dan Bintley
- East Asian Observatory, 660 North A'ohoku Place, Hilo, Hawaii 96720, USA
| | - Lindy Blackburn
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Wilfred Boland
- Nederlandse Onderzoekschool voor Astronomie (NOVA), P.O. Box 9513, 2300 RA Leiden, Netherlands
| | - Geoffrey C Bower
- Institute of Astronomy and Astrophysics, Academia Sinica, 645 North A'ohoku Place, Hilo, Hawaii 96720, USA
| | - Michael Bremer
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
| | - Christiaan D Brinkerink
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - Roger Brissenden
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Silke Britzen
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Dominique Broguiere
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
| | - Thomas Bronzwaer
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - Do-Young Byun
- Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon 34055, Republic of Korea
- University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - John E Carlstrom
- Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA
- Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA
- Department of Physics, University of Chicago, 5720 South Ellis Avenue, Chicago, Illinois 60637, USA
- Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA
| | - Andrew Chael
- Princeton Center for Theoretical Science, Jadwin Hall, Princeton University, Princeton, New Jersey 08544, USA
| | - Chi-Kwan Chan
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
- Data Science Institute, University of Arizona, 1230 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Shami Chatterjee
- Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, New York 14853, USA
| | - Koushik Chatterjee
- Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Ming-Tang Chen
- Institute of Astronomy and Astrophysics, Academia Sinica, 645 North A'ohoku Place, Hilo, Hawaii 96720, USA
| | - Yongjun Chen
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
| | - Ilje Cho
- Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon 34055, Republic of Korea
- University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - John E Conway
- Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-43992 Onsala, Sweden
| | - James M Cordes
- Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, New York 14853, USA
| | - Geoffrey B Crew
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Yuzhu Cui
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
- Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
| | - Jordy Davelaar
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - Mariafelicia De Laurentis
- Dipartimento di Fisica "E. Pancini," Universitá di Napoli "Federico II," Complesso Università di Monte Sant'Angelo, Edificio G, Via Cinthia, I-80126 Napoli, Italy
- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany
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- East Asian Observatory, 660 North A'ohoku Place, Hilo, Hawaii 96720, USA
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- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany
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- Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA
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| | - Roberto García
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
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- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
- Leiden Observatory-Allegro, Leiden University, P.O. Box 9513, 2300 RA Leiden, Netherlands
| | - José L Gómez
- Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
| | - Minfeng Gu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China
| | - Mark Gurwell
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Kazuhiro Hada
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
- Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
| | - Ronald Hesper
- NOVA Sub-mm Instrumentation Group, Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, Netherlands
| | - Luis C Ho
- Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
- Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China
| | - Paul Ho
- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Mareki Honma
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- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Lei Huang
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China
| | - David H Hughes
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Apartado Postal 51 y 216, 72000 Puebla, Puebla, México
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- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
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- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
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- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
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- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
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| | | | - Michael D Johnson
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- Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, Massachusetts 02215, USA
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| | - Taehyun Jung
- Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon 34055, Republic of Korea
- University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Mansour Karami
- Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Onatrio, N2L 2Y5, Canada
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| | - Ramesh Karuppusamy
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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- National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
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- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
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| | - Iniyan Natarajan
- Centre for Radio Astronomy Techniques and Technologies, Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa
| | - Roberto Neri
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
| | - Aristeidis Noutsos
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Hiroki Okino
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
- Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Héctor Olivares
- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany
| | - Tomoaki Oyama
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
| | - Daniel C M Palumbo
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Jongho Park
- Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. IV, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Nimesh Patel
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Ue-Li Pen
- Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Onatrio, N2L 2Y5, Canada
- Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
- Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario M5S 3H4, Canada
- Canadian Institute for Advanced Research, 180 Dundas Street West, Toronto, Ontario M5G 1Z8, Canada
| | - Vincent Piétu
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
| | - Richard Plambeck
- Radio Astronomy Laboratory, University of California, Berkeley, California 94720, USA
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- Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA
| | - Jorge A Preciado-López
- Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Onatrio, N2L 2Y5, Canada
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- Institute of Astronomy and Astrophysics, Academia Sinica, 645 North A'ohoku Place, Hilo, Hawaii 96720, USA
| | - Mark G Rawlings
- East Asian Observatory, 660 North A'ohoku Place, Hilo, Hawaii 96720, USA
| | - Alexander W Raymond
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Bart Ripperda
- Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, New Jersey 08544, USA
- Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA
| | - Freek Roelofs
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
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- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Eduardo Ros
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Mel Rose
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Arash Roshanineshat
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Helge Rottmann
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Alan L Roy
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Chet Ruszczyk
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Benjamin R Ryan
- CCS-2, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
- Center for Theoretical Astrophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Kazi L J Rygl
- Italian ALMA Regional Centre, INAF-Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
| | - Salvador Sánchez
- Instituto de Radioastronomía Milimétrica, IRAM, Avenida Divina Pastora 7, Local 20 E-18012, Granada, Spain
| | - David Sánchez-Arguelles
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Apartado Postal 51 y 216, 72000 Puebla, Puebla, México
- Consejo Nacional de Ciencia y Tecnología, Avenida Insurgentes Sur 1582, 03940 Ciudad de México, México
| | - Mahito Sasada
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
- Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Tuomas Savolainen
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
- Aalto University Department of Electronics and Nanoengineering, PL 15500, FI-00076 Aalto, Finland
- Aalto University Metsähovi Radio Observatory, Metsähovintie 114, FI-02540 Kylmälä, Finland
| | - F Peter Schloerb
- Department of Astronomy, University of Massachusetts, 01003 Amherst, Massachusetts, USA
| | - Karl-Friedrich Schuster
- Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
| | - Lijing Shao
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
- Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China
| | - Zhiqiang Shen
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
| | - Des Small
- Joint Institute for VLBI ERIC (JIVE), Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, Netherlands
| | - Bong Won Sohn
- Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon 34055, Republic of Korea
- University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Republic of Korea
- Department of Astronomy, Yonsei University, Yonsei-ro 50, Seodaemun-gu, 03722 Seoul, Republic of Korea
| | - Jason SooHoo
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Fumie Tazaki
- Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
| | - Remo P J Tilanus
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
- Leiden Observatory-Allegro, Leiden University, P.O. Box 9513, 2300 RA Leiden, Netherlands
- Netherlands Organisation for Scientific Research (NWO), Postbus 93138, 2509 AC Den Haag, Netherlands
| | - Michael Titus
- Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA
| | - Pablo Torne
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
- Instituto de Radioastronomía Milimétrica, IRAM, Avenida Divina Pastora 7, Local 20 E-18012, Granada, Spain
| | - Tyler Trent
- Steward Observatory and Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
| | - Efthalia Traianou
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Sascha Trippe
- Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Ilse van Bemmel
- Joint Institute for VLBI ERIC (JIVE), Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, Netherlands
| | - Huib Jan van Langevelde
- Joint Institute for VLBI ERIC (JIVE), Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, Netherlands
- Leiden Observatory, Leiden University, Postbus 2300, 9513 RA Leiden, Netherlands
| | - Daniel R van Rossum
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - Jan Wagner
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - John Wardle
- Physics Department, Brandeis University, 415 South Street, Waltham, Massachusetts 02453, USA
| | - Derek Ward-Thompson
- Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, United Kingdom
| | - Jonathan Weintroub
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Norbert Wex
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Robert Wharton
- Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
| | - Maciek Wielgus
- Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - George N Wong
- Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA
- CCS-2, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
| | - Qingwen Wu
- School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China
| | - Doosoo Yoon
- Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - André Young
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
| | - Ken Young
- Center for Astrophysics-Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - Ziri Younsi
- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany
- Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
| | - Feng Yuan
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China
- School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People's Republic of China
| | - Ye-Fei Yuan
- Astronomy Department, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Shan-Shan Zhao
- Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands
- School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People's Republic of China
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Kino M, Takahara F, Hada K, Akiyama K, Nagai H, Sohn BW. MAGNETIZATION DEGREE AT THE JET BASE OF M87 DERIVED FROM THE EVENT HORIZON TELESCOPE DATA: TESTING THE MAGNETICALLY DRIVEN JET PARADIGM. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0004-637x/803/1/30] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kobayashi M, Oshima K, Iwasaki Y, Kumai Y, Tsunoda Y, Kino M, Kobayashi H, Yamashina A, Takazawa K. Central rate pressure product; new marker of cardiac load with exercise. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kino M, Takahara F, Hada K, Doi A. Energy densities of magnetic field and relativistic electrons at the innermost region of the M87 jet. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136101009] [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: 11/15/2022] Open
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Lico R, Casadio C, Gómez J, Giroletti M, Orienti M, Giovannini G, Blasi M, Cotton W, Edwards PG, Fuhrmann L, Jorstad S, Kino M, Kovalev Y, Krichbaum T, Marscher A, Paneque D, Perez-Torres M, Piner G, Sokolovsky K. Very Long Baseline Polarimetric monitoring at 15 GHz of the TeV blazar Markarian 421. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136107004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nagai H, Orienti M, Kino M, Doi A, Giovannini G, Asada K, D’Ammando F, Haga T, Giroletti M, Hada K. Probing the Radio Counterpart of Gamma-ray Flaring Region in 3C 84. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136104008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hada K, Doi A, Kino M, Nagai H, Hagiwara Y, Kawaguchi N. An origin of the radio jet in M87 at the location of the central black hole. Nature 2011; 477:185-7. [PMID: 21901008 DOI: 10.1038/nature10387] [Citation(s) in RCA: 197] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 07/27/2011] [Indexed: 11/09/2022]
Abstract
Powerful radio jets from active galactic nuclei are thought to be powered by the accretion of material onto the supermassive black hole (the 'central engine'). M87 is one of the closest examples of this phenomenon, and the structure of its jet has been probed on a scale of about 100 Schwarzschild radii (R(s), the radius of the event horizon). However, the location of the central black hole relative to the jet base (a bright compact radio 'core') remains elusive. Observations of other jets indicate that the central engines are located about 10(4)-10(6)R(s) upstream from the radio core. Here we report radio observations of M87 at six frequencies that allow us to achieve a positional accuracy of about 20 microarcseconds. As the jet base becomes more transparent at higher frequencies, the multifrequency position measurements of the radio core enable us to determine the upstream end of the jet. The data reveal that the central engine of M87 is located within 14-23R(s) of the radio core at 43 GHz. This implies that the site of material infall onto the black hole and the eventual origin of the jet reside in the bright compact region seen on the image at 43 GHz.
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Affiliation(s)
- Kazuhiro Hada
- Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.
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Matoda M, Takeshima N, Nomura H, Kino M, Omatsu K, Iwase H, Umayahara K, Takizawa K. The treatment of uterine leiomyosarcoma: clinical outcomes of 18 cases and the effectiveness of chemotherapy. EUR J GYNAECOL ONCOL 2011; 32:647-650. [PMID: 22335027] [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: 05/31/2023]
Abstract
PURPOSE To investigate clinical outcomes with respect to the effectiveness of chemotherapy in the treatment of uterine leiomyosarcoma. METHODS Study subjects were 18 patients with uterine leiomyosarcoma treated surgically at our hospital between February 1986 and December 2007. A chemotherapy regimen that combined ifosfamide, epirubicine, and cisplatin (IEP) was used as the main first-line chemotherapy. RESULTS FIGO disease stages were as follows: Stage I (n = 11), Stage II (n = 1), Stage III (n = 3), Stage IV (n = 3). Five-year overall survival of patients with Stage I-III disease was 65.3% (95% CI: 46.1-92.4%). None of patients with Stage IV disease survived for more than two years. Of seven patients who suffered advanced or recurrent disease, six received IEP; the response rate was 50%, one complete response and two partial responses. CONCLUSIONS The combination of surgery and chemotherapy seems to be an acceptable treatment for uterine leiomyosarcoma. IEP may be an active regimen for this aggressive disease.
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Affiliation(s)
- M Matoda
- Department of Gynecology, Cancer Institute Hospital, Ariake, Koutou-ku, Tokyo, Japan.
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Fukasawa S, Kino M, Kobayashi M, Suzuki H, Komiya A, Imamoto T, Hirokawa Y, Shiraishi T, Takiguchi M, Ishida H, Shindo T, Seki N, Ichikawa T. Genetic changes in pT2 and pT3 prostate cancer detected by comparative genomic hybridization. Prostate Cancer Prostatic Dis 2007; 11:303-10. [PMID: 17923855 DOI: 10.1038/sj.pcan.4501017] [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: 11/09/2022]
Abstract
Prostate-specific antigen (PSA) screening has led to a remarkable increase in prostate cancer cases undergoing operative therapy. Over half of patients with locally advanced cancer (>or=pT3) develop rising PSA levels (biochemical failure) within 10 years. It is very difficult to predict which patients will progress rapidly to advanced disease following biochemical failure (BF). Therefore, a more useful prognostic factor is needed to suggest the most appropriate therapies for each patient. To determine chromosomal aberrations, we examined 30 patients with stage pT2 or pT3 primary prostate adenocarcinomas and no metastases (pN0M0) by comparative genomic hybridization (CGH). Laser capture microdissection (LCM) was used to gather cancer cells from frozen prostate specimens. Common chromosomal alterations included losses on 2q23-24, 4q26-28, 6q14-22, 8p12-22 and 13q21-31, as well as gains on 1p32-36, 6p21 and 17q21-22. Losses at 8p12-22 and 13q21-31 were observed more frequently in pT3 than pT2 tumors (P<0.05 and P<0.01, respectively). Losses at 8p12-22 were more frequent in tumors with BF (P<0.05), and those at 13q12-21 were more frequent in tumors with Gleason score (GS) 7 or more than lower GS (P<0.05). These findings suggest that losses of 8p12-22 and 13q21-31 are important determinants of prostate cancer progression.
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Affiliation(s)
- S Fukasawa
- Department of Urology, Graduate School of Medicine, Chiba University, Chiba, Japan
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Yamato T, Misumi Y, Yamasaki S, Kino M, Aomine M. Diabetes mellitus decreases hippocampal release of neurotransmitters: an in vivo microdialysis study of awake, freely moving rats. Diabetes Nutr Metab 2004; 17:128-36. [PMID: 15334789] [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: 04/30/2023]
Abstract
Possible diabetes mellitus-induced changes in hippocampal monoaminergic activities were studied to understand the relationships between neurotransmitter levels and various abnormalities in freely moving diabetic rats. We used both experimentally (STZ rats) and spontaneously diabetic rats (WBN/Kob rats) as the diabetic animal model, and compared the findings with those obtained from non-diabetic rats (C rats). Measurement of neurotransmitters (serotonin and dopamine) was carried out using an in vivo microdialysis method. We found that: 1) the basal level of serotonin in the hippocampus was lowest in WBN rats, followed by STZ rats, then by C rats. The level of serotonin in WBN rats was about a half of that in C rats; 2) the basal level of dopamine was also significantly lower in the diabetic WBN and STZ rats than in C rats. The data show that diabetes mellitus decreases in the monoamine release from the hippocampus in both experimentally and spontaneously diabetic rats.
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Affiliation(s)
- T Yamato
- Laboratory of Food Processing, Department of Nutrition Sciences, Faculty of Nutrition Sciences, Nakamura Gakuen University, Fukuoka, Japan
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Hasui M, Kobayashi Y, Harada Y, Ono A, Okazaki H, Kino M, Hara T. [Clinical and bacteriological studies of ceftriaxone (CTRX) once daily administration in pediatric patients with respiratory tract infections]. Jpn J Antibiot 2001; 54:532-40. [PMID: 11771335] [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: 02/23/2023]
Abstract
Clinical studies of ceftriaxone (CTRX) were performed at a dose of 40 mg/kg once daily to evaluate its pharmacokinetics, and clinical and bacteriological efficacies in pediatric patients with respiratory tract infections. The following results were obtained. 1. Of 45 patients, clinical responses to CTRX were excellent in 34 (75.6%), good in 9 (20.0%) and poor in 2 (4.4%), indicating the overall efficacy rate of 95.6%. 2. Haemophilus influenzae (23 strains), Streptococcus pneumoniae (20 strains) and Moraxella catarrhalis (17 strains) were isolated from the patients as the main causative organisms. MIC90 of CTRX against these detected bacteria was < or = 0.06 microgram/ml with H. influenzae [beta-lactamase (-)/ABPC (S)], 0.25 microgram/ml with H. influenzae (BLNAR), 0.05 microgram/ml with PSSP, 1.0 microgram/ml with PISP/PRSP and 2.0 micrograms/ml with M. catarrhalis, respectively. 3. The eradication rate of causative organisms was 90.0% (27/30). 4. Serum levels of CTRX after administration of a 1-hour intravenous drip infusion of 40 mg/kg were investigated in 12 patients. Mean serum level at 24 hours after the administration was 9.4 +/- 2.8 micrograms/ml, which covered the level of MIC90 throughout the 24 hours. 5. No adverse reactions related to CTRX were observed. As the approved dosage of CTRX in pediatric patients is twice daily, while it is once daily in adults, there have been few reports on the efficacy of once-daily CTRX in pediatrics. According to the results of the study, it is suggested that once-daily CTRX for the pediatric patients with respiratory tract infections is useful. Further studies might be required to establish outpatient parenteral antibiotic therapy (OPAT) in pediatric infections.
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Affiliation(s)
- M Hasui
- Department of Pediatrics, Kansai Medical University
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Hiraoka M, Taniguchi T, Nakai H, Kino M, Okada Y, Tanizawa A, Tsukahara H, Ohshima Y, Muramatsu I, Mayumi M. No evidence for AT2R gene derangement in human urinary tract anomalies. Kidney Int 2001; 59:1244-9. [PMID: 11260384 DOI: 10.1046/j.1523-1755.2001.0590041244.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND It has been recently found that mice, especially males, with a disrupted angiotensin type 2 receptor (AT2R) gene, which is located on the X-chromosome, often have a range of congenital anomalies of the kidney and urinary tract (CAKUT), including renal hypoplasia, and that Caucasian male patients with ureteropelvic junction stenosis (UPJ) and multicystic dysplastic kidneys frequently have A-G transition in intron 1 of the AT2R gene. We have previously found that renal hypoplasia is remarkably predominant in Japanese boys. METHODS We investigated sex ratios for the frequency of each CAKUT. The frequency of the A-G transition between the controls and 66 Japanese boys with CAKUT were compared. There was renal hypoplasia in 16, UPJ in 17, vesicoureteral in 20, and other anomalies in 13. We also investigated whether any mutations in AT2R genes were detectable in patients with renal hypoplasia. RESULTS In contrast to mice with a disruption of the AT2R gene, the male-to-female ratios in human patients proved to be considerably variable: 16 for renal hypoplasia, 2.1 for UPJ, 0.8 for vesicoureteral, and 1.2 for others. The frequency of the A-G transition was not different between the control population and the patients with CAKUT [31 of 102 (30%) vs. 23 of 66 (35%), respectively]. A sequencing study disclosed no mutations in nine boys with renal hypoplasia. CONCLUSIONS These findings indicate that the AT2R gene may not play a major role in the development of renal hypoplasia and other CAKUT in humans, at least in the Japanese population.
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Affiliation(s)
- M Hiraoka
- Department of Pediatrics, Fukui Medical University School of Medicine, Fukui, Japan.
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Yamato T, Yamasaki S, Misumi Y, Kino M, Obata T, Aomine M. Postrest contraction in the ventricular papillary muscle of spontaneously diabetic WBN/Kob rat. Exp Anim 2001; 50:19-31. [PMID: 11326420 DOI: 10.1538/expanim.50.19] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
In the present study, we investigated the characteristics of the postrest contraction (PRC) in chronic diabetic ventricular muscle. We used WBN/Kob rats of 7-8 weeks as the spontaneously diabetic animal and Wistar rats of 7-8 weeks as the control. We found: (1) No significant differences were seen in the amplitude, the contracting speed, and the relaxing speed of electrically stimulated twitch tension between control and WBN/Kob rats. In addition, the relationship between amplitude of twitch tension and stimulus cycle lengths (0.2-5 sec) was very similar in both animals. (2) The ratios of the first twitch tension (T1) of PRC with various rest intervals (5-600 sec) to the steady-state tension (Tss) were significantly smaller in the diabetic rats than in the controls. (3) When the preparation was stimulated at shorter cycle lengths, the recovery process of PRC was separated into at least two components (fast and slow components). In the diabetic rats, the time constant (tau) of both components was significantly longer than in controls. (4) After caffeine (10(-3) M) treatment, tau of the fast component in the control rats became longer, whereas it remained unchanged in diabetic rats. These findings suggest a dysfunction of the intracellular calcium handling system in spontaneously diabetic heart that is likely to include impaired calcium sequestration and/or extrusion.
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Affiliation(s)
- T Yamato
- Division of Food Processing, Graduate School of Health and Nutrition Sciences, Nakamura Gakuen University, 5-7-1 Befu, Fukuoka 814-0198, Japan
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18
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Affiliation(s)
- S Yoshijima
- Department of Pediatrics, Kansai Medical University, Moriguchi, Osaka, Japan
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19
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Ishihara R, Taketani S, Sasai-Takedatsu M, Adachi Y, Kino M, Furuya A, Hanai N, Tokunaga R, Kobayashi Y. ELISA for urinary trehalase with monoclonal antibodies: a technique for assessment of renal tubular damage. Clin Chem 2000; 46:636-643. [PMID: 10794745 DOI: 10.1093/clinchem/46.5.636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 10/08/2023]
Abstract
BACKGROUND alpha,alpha-Trehalase, located on renal proximal tubules, is a glycoprotein that hydrolyses alpha,alpha-trehalose to two glucose molecules. Urinary trehalase reflects damage to renal proximal tubules, but its activity has not been measured routinely because measurement of catalytic activity is rather complicated and because conventional assays for enzyme activity might not reflect all of the trehalase protein because of enzyme inactivation in urinary samples. METHODS We established novel monoclonal antibodies for human trehalase and a sandwich ELISA for quantification of urinary trehalase. We determined the urinary trehalase protein concentration with this ELISA and trehalase catalytic activity, and the results of these two methods were compared. RESULTS The ELISA system was more sensitive than the detection of enzyme activity and could detect a subtle difference in the amount of trehalase present in renal diseases. The within- and between-assay CVs in the ELISA were 6.7-7.6% and 6.2-8.2%, respectively. Highly significant increases in both the quantity and activity were seen in patients with nephrotic syndrome (acute phase), Lowe syndrome, and Dent disease. The quantities were 70- to 200-fold greater, whereas enzyme activities were, at most, 10-fold higher than those of control subjects. In the detection of small amounts of trehalase in patients with chronic glomerulonephritis and renal anomalies, quantities were better than enzyme activities. CONCLUSIONS We have established an ELISA system for quantification of urinary trehalase that uses novel monoclonal antibodies. Our ELISA system is simpler and more sensitive than a conventional activity assay and reflects trehalase protein. This ELISA can be a useful as a common tool for clinical assessment of renal proximal tubular damage.
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Affiliation(s)
- R Ishihara
- Department of Pediatrics, Kansai Medical University, Fumizonocho 10-15, Moriguchi, Osaka 570-8506, Japan.
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20
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Fujiwara T, Kino M, Takeoka K, Kobayashi Y, Hamada Y. Intraluminal duodenal diverticulum in a child: incidental onset possibly associated with the ingestion of a foreign body. Eur J Pediatr 1999; 158:108-10. [PMID: 10048605 DOI: 10.1007/s004310051028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
UNLABELLED Funnel-type intraluminal duodenal diverticulum (windsock web) is a rare congenital malformation. A 4-year-old boy with vomiting and abdominal pain for several weeks was referred to the hospital. A plain abdominal X-ray on admission disclosed a double bubble sign. Abdominal echography and CT disclosed a foreign body lodged in the alimentary tract. After the foreign body was removed with a fibrescope, endoscopy showed a stenotic descending portion where the foreign body was located. An upper gastro-intestinal contrast study demonstrated a post-bulbar duodenal stenosis with a barium-filled pear-shaped sac in the descending portion of the duodenum. Surgical exploration was done under the diagnosis of windsock web of the duodenum. A simple excision of the web at its base was carried out. A hole 7 mm in diameter was found at the edge of the web. The microscopic appearance of the resected specimen was characterized by the duodenal mucosa with an extensive chronic inflammation lining both sides of the diverticulum and the lack of muscular layer of mucosa. CONCLUSION If an ingested material is not excreted in the stool, possible clogging in the intestinal tract should always be considered and a further intensive examination is warranted.
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Affiliation(s)
- T Fujiwara
- Department of Paediatrics, Kansai Medical University, Moriguchi, Osaka, Japan
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21
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Kino M, Kobayashi Y. [Urinary tract infection]. Ryoikibetsu Shokogun Shirizu 1999:142-4. [PMID: 10337760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Affiliation(s)
- M Kino
- Department of Pediatrics, Kansai Medical University
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22
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Abstract
UNLABELLED Adrenal enlargement was followed by serial ultrasonography in an infant with congenital lipoid adrenal hyperplasia (lipoid CAH) from day 12 until 2 years and 4 months of age, when they were no longer detectable. Contrary to other types of CAH in which the configuration changes soon after replacement therapy, this infant with lipoid CAH showed persistent adrenal cortex enlargement due to massive accumulation of lipids and cholesterol resulting in a damaged glandular cyto-architecture. CONCLUSION ultrasonographically persistent enlargement of the adrenals after replacement therapy is suggestive of the lipoid form of CAH.
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Affiliation(s)
- J Takaya
- Department of Paediatrics, Kansai Medical University, Moriguchi, Osaka, Japan
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23
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Abstract
In hypertrophic pyloric stenosis (HPS), prompt pyloromyotomy is, in general, the treatment of choice. There has been no information available as to the natural history of the pyloric tumour. We present four infants with medically treated HPS who were followed by sonography to observe the anatomical changes that occur with atropine sulfate. The initial change was shortening of the pyloric canal, followed by thinning of the muscular layer as clinical symptoms improved.
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Affiliation(s)
- A Yamamoto
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
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24
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Ishihara R, Taketani S, Sasai-Takedatsu M, Kino M, Tokunaga R, Kobayashi Y. Molecular cloning, sequencing and expression of cDNA encoding human trehalase. Gene X 1997; 202:69-74. [PMID: 9427547 DOI: 10.1016/s0378-1119(97)00455-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A complete cDNA clone encoding human trehalase, a glycoprotein of brush-border membranes, has been isolated from a human kidney library. The cDNA encodes a protein of 583 amino acids with a calculated molecular weight of 66,595. Human enzyme contains a typical cleavable signal peptide at amino terminus, five potential glycosylation sites, and a hydrophobic region at carboxyl terminus where the protein is anchored to plasma membranes via glycosylphosphatidylinositol. The deduced amino acid sequence of the human enzyme showed similarity to sequences of the enzyme from rabbit, silk worm, Tenebrio molitor, Escherichia coli and yeast. Northern blots revealed that human trehalase mRNA of approx. 2.0 kb was found mainly in the kidney, liver and small intestine. Expression of the recombinant trehalase in E. coli provided a high level of the enzyme activity. The isolation and expression of cDNA for human trehalase should facilitate studies of the structure of the gene, as well as a basis for a better understanding of the catalytic mechanism.
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Affiliation(s)
- R Ishihara
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
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25
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Yamaguchi K, Yurino N, Kino M, Ishiguro M, Funatsu G. The amino acid sequence of mitogenic lectin-B from the roots of pokeweed (Phytolacca americana). Biosci Biotechnol Biochem 1997; 61:690-8. [PMID: 9145528 DOI: 10.1271/bbb.61.690] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 02/04/2023]
Abstract
The complete amino acid sequence of pokeweed lectin-B (PL-B) has been analyzed by first sequencing seven lysylendopeptidase peptides derived from the reduced and S-pyridylethylated PL-B and then connecting them by analyzing the arginylendopeptidase peptides from the reduced and S-carboxymethylated PL-B. PL-B consists of 295 amino acid residues and two oligosaccharides linked to Asn96 and Asn139, and has a molecular mass of 34,493 Da. PL-B is composed of seven repetitive chitin-binding domains having 48-79% sequence homology with each other. Twelve amino acid residues including eight cysteine residues in these domains are absolutely conserved in all other chitin-binding domains of plant lectins and class I chitinases. Also, it was strongly suggested that the extremely high hemagglutinating and mitogenic activities of PL-B may be ascribed to its seven-domain structure.
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Affiliation(s)
- K Yamaguchi
- Laboratory of Protein Chemistry and Engineering, Graduate School of Genetic Resources Technology, Kyushu University, Fukuoka, Japan
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26
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Abstract
We report the case of a 3-year-old boy with Ménétrier's disease who presented with prominent anasarca associated with hypoproteinemia, but no proteinuria. An early sonogram of the stomach demonstrated thickening of the gastric wall which was found to resolve gradually on serial sonograms. Consequently, we considered that the submucosal layer of the gastric wall was particularly thickened as a result of Ménétrier's disease. A gastric biopsy was performed 18 days after onset of the disease, and an electron-microscopic examination of the sample disclosed persistent widening of gastric tight junctions by more than 10 nm. The patient made a full recovery on supportive treatment in 3 weeks. Ultrasonography provided us with a potent tool not only in making the diagnosis, but also in following the course of the disease.
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Affiliation(s)
- J Takaya
- Department of Pediatrics, Kansai Medical University, Fumizonocho 10-15, Moriguchi, Osaka 570, Japan
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27
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Takaya J, Iwamoto Y, Higashino H, Kino M, Kobayashi T, Kobayashi Y. Altered intracellular calcium and phorbol 12,13-dibutyrate binding to intact platelets in young obese subjects. J Lab Clin Med 1997; 129:245-50. [PMID: 9016862 DOI: 10.1016/s0022-2143(97)90146-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The study was designed to examine cytosolic free calcium ((Ca2+)i) and phorbol dibutyryl ester binding in intact platelets of young obese subjects as compared with the platelets of age-matched subjects with non-insulin-dependent diabetes mellitus (NIDDM) and those of healthy control subjects. The assay was studied in basal and thrombin-stimulated conditions. The binding parameter of phorbol ester is a criterion for active protein kinase C (PKC) units in the platelet plasma membrane. The resting (Ca2+)i correlated with body mass index (BMI)(r = 0.385, p = 0.0034) and plasma insulin level (r = 0.316, p = 0.0269), and the resting (Ca2+)i level was higher in the obesity group (160.6 +/- 15.8 nmol/L; n = 25) than controls (78.9 +/- 7.6 nmol/L; n = 24, p < 0.0001). Among the obesity and control groups, there was a correlation between BMI and fasting plasma insulin level (r = 0.399, p = 0.0237). Systolic blood pressure correlated with BMI(r = 0.504, p = 0.0005). The mean systolic blood pressure of the obesity group was higher than those of the other two groups. The mean Hill coefficient for thrombin-treated platelets of phorbol dibutyrate binding was higher in the obesity group when compared with healthy controls and the subjects with NIDDM (1.47 +/- 0.21 vs 1.06 +/- 0.16 and 0.99 +/- 0.09, respectively; p < 0.05). In conclusion, young subjects with simple obesity have already developed altered platelet Ca2+ regulation that is usually observed in adult patients with a number of metabolic diseases. These data are interpreted to indicate that a relationship exists between dysregulation of PKC and impaired glucose tolerance that precedes other complications of obesity.
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Affiliation(s)
- J Takaya
- Department of Pediatrics, Kansai Medical University, Moriguchi, Osaka, Japan
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28
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Kino M. [Nephrocalcinosis]. Ryoikibetsu Shokogun Shirizu 1997:659-61. [PMID: 9278018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- M Kino
- Department of Pediatrics, Kansai Medical University
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29
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Kobayashi Y, Kino M, Higashino H, Takaya J, Harada Y, Kawamura Y, Kawasaki H, Nagao Y. [Clinical study of a macrolide antibiotic, azithromycin, in pediatric patients]. Jpn J Antibiot 1996; 49:1004-12. [PMID: 8988412] [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: 02/03/2023]
Abstract
Azithromycin (AZM), 10% fine granules or 100 mg capsules, were given orally to 27 children with various pediatric infections. The results of the study are shown below. 1. Pharmacokinetic investigation. We studied plasma and urinary concentrations after 100 mg AZM capsules were given. One patient received 8.3 mg/kg of AZM once a day for 3 days, and AZM concentration in plasma was 0.033 microgram/ml 48 hours after the final dosing. Doses of 8.3 and 12.5 mg/kg body weight of AZM were respectively given to two patients once daily for 3 days. As a result, AZM concentrations in urine during a period between 96 and 120 hours post-dosing were 1.67 and 4.53 micrograms/ml, respectively, and urinary excretion rate in 120 hours after the first dosing was 10.54% in the patient that was given 12.5 mg/kg. 2. Clinical investigation. Clinical efficacies were examined in 24 patients. Excellent results were obtained in 7 patients, good results in 14 patients, hence the clinical efficacy rate was 87.5%. Bacteriologically, Haemophilus influenzae strains isolates from 2 patients were eradicated in 1 and decreased in the other. Safety was evaluated in 26 patients. An adverse reaction was observed in 1 patient (urticaria). Abnormal laboratory test results were observed in 2 patients, decreased WBC in 1 and elevation of eosinophils in the other. The above results suggest that AZM is a useful oral antibiotic for pediatric patients with infection with susceptible organisms.
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Affiliation(s)
- Y Kobayashi
- Department of Pediatrics, Kansai Medical University
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30
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Kojima T, Hattori K, Hirata Y, Aoki T, Sasai-Takedatsu M, Kino M, Kobayashi Y. Endothelin-1 has a priming effect on production of superoxide anion by alveolar macrophages: its possible correlation with bronchopulmonary dysplasia. Pediatr Res 1996; 39:112-116. [PMID: 8825394 DOI: 10.1203/00006450-199601000-00016] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The purpose of this study was to clarify the role of endothelin (ET)-1 in the development of bronchopulmonary dysplasia (BPD). Tracheal aspirates were obtained from 27 newborn babies with respiratory distress (13 with BPD and 14 without BPD) who were mechanically ventilated. Production of superoxide anion (O2-) by rabbit alveolar macrophages was determined by preincubation with the tracheal aspirate supernatant (TAS) and stimulation with phorbol myristate acetate (PMA). O2- production was demonstrated only when PMA was added to the experimental system and was enhanced with TAS of infants who later developed BPD compared with TAS from infants without BPD. The effects of ET-1 and ET-3 on O2- production and the blockade by anti-ET-1 antibody and BQ123 (ET A receptor antagonist) were also examined. The enhancing effect was blocked by either anti-ET-1 antibody or BQ123. PMA-stimulated production of O2- increased when cells were preincubated with several doses of ET-1 (5 x 10(-13) to 2 x 10(-12) M), whereas ET-3 was without effect. TAS contained significant amounts of immunoreactive ET-1, and there was a close positive correlation (r = 0.764) between the activity of O2- production and immunoreactive ET-1 levels in TAS samples. These results may be interpreted to indicate that ET-1 synthesized by and secreted from tracheal epithelial cells and/or alveolar macrophages has a priming effect on alveolar macrophages to produce O2-, thus possibly contributing to the development of BPD.
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Affiliation(s)
- T Kojima
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
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31
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Kino M, Yamaguchi K, Umekawa H, Funatsu G. Purification and characterization of three mitogenic lectins from the roots of pokeweed (Phytolacca americana). Biosci Biotechnol Biochem 1995; 59:683-8. [PMID: 7772833 DOI: 10.1271/bbb.59.683] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 01/27/2023]
Abstract
Three mitogenic lectins, designated PL-A, PL-B, and PL-C, were purified from the roots of pokeweed (Phytolacca americana) using Q-Sepharose column chromatography followed by gel filtration on Sephadex G-75, hydrophobic chromatography on Butyl-Toyopearl, and FPLC on a Mono-Q column. PL-A, PL-B, and PL-C are acidic proteins having isoelectric points of 4.35 and their apparent molecular masses were 22, 48, and 21 kDa by SDS-polyacrylamide gel electrophoresis in the presence of 2-mercaptoethanol, respectively. The three lectins have similar amino acid compositions rich in half-cystine and similar N-terminal sequences, indicating that they are homologous proteins. Identical sequences of N-terminal regions and six corresponding tryptic peptides in PL-A and PL-B suggested that PL-A may be an N-terminal half fragment of PL-B. Although all of three lectins have mitogenic activities, PL-B is a mitogenic lectin with the most potent hemagglutinating and mitogenic activities, and PL-C has almost no hemagglutinating activity.
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Affiliation(s)
- M Kino
- Laboratory of Protein Chemistry and Engineering, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
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Kino M, Higashino H, Kobayashi Y. [Clinical evaluation of a new oral penem, SY5555, in infants and children]. Jpn J Antibiot 1995; 48:200-4. [PMID: 7745809] [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: 01/26/2023]
Abstract
A clinical study was performed on SY5555, a newly developed penem antibiotic, in children. SY5555 was given orally to 14 patients at 19-29 mg/kg/day in 3 doses for 4 to 12 days. Clinical evaluations were made on the 14 patients including 4 with pharyngitis, 7 with tonsillitis, one with urinary tract infection, and 2 with impetigo. Overall clinical effects were excellent in 2, good in 12, with an efficacy rate of 100%. Causative organisms (Staphylococcus aureus and Streptococcus pyogenes) were all eradicated. As to adverse reactions, mild diarrhea was observed in 4 patients. These data suggest that SY5555 is a useful oral antibiotic for the treatment of bacterial infections in children.
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Affiliation(s)
- M Kino
- Department of Pediatrics, Kansai Medical University
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Shoji S, Furuishi K, Misumi S, Miyazaki T, Kino M, Yamataka K. Thiamine disulfide as a potent inhibitor of human immunodeficiency virus (type-1) production. Biochem Biophys Res Commun 1994; 205:967-75. [PMID: 7999140 DOI: 10.1006/bbrc.1994.2760] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [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: 01/28/2023]
Abstract
Thiol and disulfide compounds were tested as an anti-HIV drug against transactivator (Tat)-mediated transactivation of HIV-1. Of all the compounds tested, thiamine disulfide, alpha-lipoic acid, and N-acetycysteine significantly depressed HIV-1 Tat activity. Thiamine disulfide alone in these compounds possessing anti-HIV-Tat activity markedly inhibited production of progeny HIV-1 in acute and chronic HIV-1-infected CEM at nontoxic concentrations of 500-1000 microM. Thiamine disulfide (500 microM) blocked 99.7% of HIV-1 production after 96 hr culture in acute HIV-1 (LAV-1) infection (m.o.i. = 0.002), whereas it inhibited 90-98% of HIV-1 production in chronic-infected cells (CEM/LAV-1, H9/MN, and Molt-4/IIIB). The results suggest that thiamine disulfide may be important for AIDS chemotherapy.
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Affiliation(s)
- S Shoji
- Department of Biochemistry, Faculty of Pharmaceutical Sciences, Kumamoto University, Japan
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Taniuchi S, Higashino H, Takaya J, Ishizaki Y, Kino M, Man W, Kobayashi Y. [Clinical evaluation of a new parenteral cephem, cefozopran, in children]. Jpn J Antibiot 1994; 47:1553-8. [PMID: 7853685] [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: 05/22/2023]
Abstract
Cefozopran (CZOP, SCE-2787), a new parenteral cephem, was evaluated for its antibacterial activity and clinical efficacy. CZOP, 24.0-78.0 mg/kg/day, was given to 11 pediatric patients in 3 dose a day via 30-minute drip infusion. Clinically evaluated were nine patients including 4 with acute pneumonia, 2 with urinary tract infections, 2 with lymphadenitis and 1 with sepsis. Two patients were excluded because of possible non-bacterial infections. Clinical efficacies were excellent in 5, good in 3 and fair in 1. Bacteriological responses were confirmed for 5 strains in 5 patients. Four strains were eradicated, but one strain was not. MICs of CZOP were equal to those of ceftazidime. Side effects or abnormal laboratory test results were observed in 3 patients; diarrhea in 1, elevated GPT in 1 and thrombocytosis in 1, but none of them was significant.
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Affiliation(s)
- S Taniuchi
- Department of Pediatrics, Kansai Medical University
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35
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Kino M, Hihashino H, Kobayashi Y. [Clinical evaluation of a new cephem S-1108 in infants and children]. Jpn J Antibiot 1993; 46:1075-82. [PMID: 8107270] [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: 01/28/2023]
Abstract
A clinical study in children has been performed on S-1108, a newly developed cephem antibiotic. S-1108 was given orally to 30 patients, at doses between 8 and 12 mg/kg/day in 3 divided doses for 2 to 10 days. Clinical evaluations were made on 26 patients consisting of 12 patients of pharyngitis, 5 of tonsillitis and of impetigo, one each of bronchitis, cystitis, lymphadenitis and cellulitis. Overall clinical effects were excellent in 10, good in 15, fair in 1 with an efficacy rate of 96%. As to adverse reactions, mild diarrhea (2 patients) and transients elevation of transaminases (one patient) were observed. These data suggest that S-1108 is a useful oral antibiotic for the treatment of bacterial infections in children.
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Affiliation(s)
- M Kino
- Department of Pediatrics, Kansai Medical University
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36
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Shoji S, Furuishi K, Yanase R, Miyazaka T, Kino M. Allyl compounds selectively killed human immunodeficiency virus (type 1)-infected cells. Biochem Biophys Res Commun 1993; 194:610-21. [PMID: 8343148 DOI: 10.1006/bbrc.1993.1865] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [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: 01/30/2023]
Abstract
Various allyl compounds were tested as anti-HIV reagents. Of all the allyl compounds tested, allyl disulfide (CH2 = CH-CH2-S-S-CH2-CH = CH2), allyl alcohol (CH2 = CH-CH2-OH), and its ester strongly depressed cell proliferation of HIV-1-infected cells. KC50 (50% killing concentration) of the allyl disulfide and the allyl alcohol were 34 microM and 10 microM, respectively. The allyl alcohol, in particular, completely inhibited cell growth of HIV-1-infected cells by a single injection at a concentration of 40 microM, ultimately killing the viable CEM/LAV-1 cells within 96 hr cultivation. No effect of the allyl alcohol and its esters on cell proliferation of CEM cells, which are a HIV-1 noninfected human T-cell cell line, was observed at the concentration range of 20 to 200 microM under the same experimental conditions. The results suggest that the effect of the allyl alcohol and its esters resulted in remarkable promotion of the cytopathic effect induced by HIV-1 virus.
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Affiliation(s)
- S Shoji
- Department of Biochemistry, Faculty of Pharmaceutical Sciences, Kumamoto University, Japan
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37
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Woo M, Higashino H, Kohdera U, Nakamura M, Kawasaki H, Kino M, Kobayashi Y. [Clinical evaluation of a new oral cephalosporin, cefprozil, in pediatrics]. Jpn J Antibiot 1992; 45:1635-41. [PMID: 1289581] [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: 12/26/2022]
Abstract
Cefprozil (CFPZ, BMY-28100), a new oral cephalosporin, was evaluated for its antibacterial activity and clinical efficacy. Thirty-four patients were treated with 7.7-36.2 mg/kg per day of CFPZ divided into 3 times. A total of 33 patients including 3 with acute pneumonia, 2 with acute bronchitis, 17 with acute upper respiratory tract infections, 4 with urinary tract infections, 1 with suppurative lymphadenitis and 6 with other soft tissue infections were evaluated for clinical efficacy except for 1 patient whose general conditions were too serious to continue to be treated with orally medication. Clinical effects were excellent in 8 patients and good in 23 but 2 cases were excluded because they were suspected for viral infections, hence the overall efficacy rate was 100%. Bacteriological responses were confirmed on 6 (66.7%) strains which were eradicated by the treatment out of 9 strains identified. CFPZ showed stronger antibacterial activities than those of cefaclor. Side effects or abnormal laboratory test results were observed in 2 patients; nausea and pallor of face in 1 patient and an increase of eosinophil in 1. The above findings suggest that CFPZ is a safe and useful antibiotics for the treatment of bacterial infections in pediatric patients.
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Affiliation(s)
- M Woo
- Department of Pediatrics, Kansai Medical University
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Horii T, Okazaki H, Kino M, Kobayashi Y, Satouchi K, Saito K. Platelet-activating factor detected in bronchoalveolar lavage fluids from an asthmatic patient. Lipids 1991; 26:1292-6. [PMID: 1819719 DOI: 10.1007/bf02536551] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [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: 12/28/2022]
Abstract
It recently has been recognized that platelet-activating factor (PAF) may be a mediator of asthma exacerbation. We had the opportunity to analyze bronchoalveolar lavage fluids from an asthmatic infant, which were characterized by neutrophil infiltration. The patient's lungs were washed on three occasions with saline during asthmatic attacks. PAF was found in each case on the basis of its ability to cause the immediate aggregation of washed rabbit platelets. The PAF detected was equivalent to 1-1.4 pmol of 1-O-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine, three quarters of which were recovered in cell-associated form. By contrast, we did not detect PAF in bronchoalveolar exudates from patients with laryngeal stenosis or with respiratory distress syndrome. LysoPAF, the direct precursor as well as initial metabolite of PAF, was also analyzed after being converted to PAF by acetylation. There was a wide variation in the amount of lysoPAF present in individual patients, suggesting that lysoPAF levels cannot be taken as an indicator for the presence of PAF.
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Affiliation(s)
- T Horii
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
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Kohdera U, Woo M, Kino M, Kawasaki H, Suzukawa J, Nakamura M, Cho S, Hirabayashi Y, Higashino H, Kobayashi Y. [Pharmacokinetic and clinical study of cefpirome in children]. Jpn J Antibiot 1991; 44:213-22. [PMID: 2041161] [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: 12/29/2022]
Abstract
Pharmacokinetic and clinical studies of cefpirome (CPR) in children were carried out, and the following results were obtained. 1. Peak serum levels were obtained at the end of drip infusion of 20.0, 17.5 and 6.8 mg/kg for 30 minutes and the half-lives were 1.93, 1.91 and 0.48 hours, respectively. 2. Urinary excretion rates in 6 hours were 40.0-96.2%. 3. Thirty-two patients including 17 with respiratory infections, 7 with urinary tract infections and 8 with skin and soft tissue infections were treated with CPR at 52.2-92 mg/kg per day by intravenous administration. Clinical effects were excellent in 12 cases, good in 13 cases, fair in 3 cases and unknown in 4 cases, and the overall efficacy rate was 89.3% (25 cases/28 cases). 4. Bacterial eradication rate was 93.8% (15 strains/16 strains). 5. Rash and diarrhea were found in 1 case each, and abnormal laboratory test values were found in 7 cases.
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Affiliation(s)
- U Kohdera
- Department of Pediatrics, Kansai Medical University
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Kubota J, Kubo S, Nishimura H, Ueyama M, Kino M, Nakayama A, Hara M, Kawamura K. Cardiorenal effects of an orally active dopamine prodrug (TA-870) in patients with congestive heart failure. J Cardiovasc Pharmacol 1989; 14:53-7. [PMID: 2475715 DOI: 10.1097/00005344-198907000-00010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The effects of TA-870, a newly synthesized orally active dopamine prodrug, on the cardiorenal functions were investigated in 12 patients with severe chronic congestive heart failure. A single oral dose of TA-870 (1,200 mg) improved left ventricular fractional shortening and mean circumferential velocity on M-mode echocardiography (p less than 0.01 for both). Renal plasma flow and glomerular filtration rate improved with TA-870 (p less than 0.01 and p less than 0.05, respectively); urine volume and sodium excretion increased (p less than 0.01 for both). Blood pressure and heart rate did not change during the 4-h experimental period. Mean plasma free dopamine levels peaked 1 h after dosing. These data suggest that the cardiorenal effects of oral TA-870 are comparable with those of continuous intravenous injections of dopamine. Thus, TA-870 appears to be a useful alternative drug to intravenous dopamine.
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Affiliation(s)
- J Kubota
- Department of Internal Medicine, Osaka Medical College, Japan
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Hirabayashi Y, Higashino H, Kino M, Nobori U, Okazaki H, Kitamura N, Kobayashi Y. [Clinical and pharmacokinetic evaluation of cefodizime in children]. Jpn J Antibiot 1989; 42:1366-80. [PMID: 2795860] [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: 01/02/2023]
Abstract
Cefodizime (CDZM, THR-221), a new cephem antibiotic, was investigated for its clinical efficacy and pharmacokinetics in children. The results obtained are summarized as follows. 1. Antimicrobial activities Antimicrobial activities of CDZM against clinically isolated organisms were determined. MICs of CDZM against 1 strain each of Streptococcus pneumoniae, Escherichia coli and Klebsiella pneumoniae were 0.05 micrograms/ml to 0.10 micrograms/ml. Especially, MIC against all 6 strains of Haemophilus influenzae was less than or equal to 0.024 micrograms/ml. This MIC value was lower than those of other antibiotics such as cefotaxime, cefotiam, cefazolin, piperacillin. 2. Pharmacokinetics CDZM was given to 1 case at a dose of 20 mg/kg by a 60-minute intravenous drip infusion. The peak value of serum concentration of CDZM was 207.80 micrograms/ml at the end of the infusion. The half-life was 2.15 hours. The mean urinary excretion rate was 68.5% in the first 4 hours, 79.2% in 6 hours and 76.5% in 8 hours after the 30-minute drip infusion. 3. Clinical efficacy CDZM was given to a total of 27 patients, 13 with pneumonia, 1 with bronchitis, 2 with acute pharyngitis, 1 with purulent tonsillitis, 5 with urinary tract infection, 1 each with retrograde cholangitis, acute enteritis, pericementitis, phlegmon and inguinal lymphadenitis. Overall clinical efficacies were excellent in 5 cases, good in 17 and the efficacy rate was 81%. Bacteriological effects were investigated in 13 cases and the eradication rate was 85%. No adverse reactions were observed in any case. As abnormal laboratory findings, elevated GOT, GPT, A1-P, LAP and gamma-GTP, were noted in 1 out of the 28 cases examined.
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Abstract
A 5-year-old girl with congenital sensorial deafness experienced four episodes of bacterial meningitis in a 13-month period. On the fourth episode, an extensive search for the cause of recurrent meningitis was conducted. Complete immunologic studies, humoral, cellular, and phagocytic, yielded negative results. Precise otological examination, i.e., skull roentgenograms, an inner ear target CT scan, and puncture of the eardrum, was attempted, which disclosed the inner ear malformation (Mondini's anomaly) and a cerebrospinal fluid (CSF) fistula. CSF discharge from the oval window was repaired surgically. Extensive otologic evaluation should be conducted in patients with recurrent bacterial meningitis.
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Affiliation(s)
- N Hayashi
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
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Hopp L, Nakamura A, Kino M, Kuriyama S, Aviv A. Refined evaluation of the exponential curve parameters and initial exchange rate constant for 22Na+ washout in cultured human skin fibroblasts. Proc Soc Exp Biol Med 1988; 188:70-6. [PMID: 3368481 DOI: 10.3181/00379727-188-42708] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A technique is proposed to evaluate the exponential curve parameters and the initial exchange rate constant (kie) for 22Na+ washout from cultured human skin fibroblasts. After loading with the isotope, the cells were subjected to cold washing and warming steps. A desaturation curve for 22Na+ washout was developed including the activity in the warming medium that corresponded to t = 0 min. Using nonlinear regression analysis, a general three exponential function adequately described the 22Na+ washout in the time interval of 0-70 min. A back extrapolation was performed to estimate the initial time (ti; a negative number) when the total activity was present in the cells. The ti was substituted into the first derivative function of the three exponents to yield the kie. Calculated from the equilibrium distribution of 22Na+ and the specific activity of the medium, the concentration of Na+ (in mM; mean +/- SD) for fibroblasts of two individuals were 13.3 +/- 2.3, n = 3, and 19.0 +/- 5.2, n = 4. This indicates that the washout originated mainly or exclusively from the cellular milieu. Therefore, the kie represents the equilibrium exchange rate constant for Na+ washout from an inhomogeneous cell-related space. Multiple experiments demonstrated that the kie value for the two subjects were significantly higher than the initial slopes of the washout curves (kA), a commonly used parameter to characterize Na+ washout, and significantly lower than the slopes of the fastest exponential components (k3): kie = 0.531 +/- 0.017, kA = 0.502 +/- 0.019, and k3 = 0.557 +/- 0.017 min-1 (n = 3) for one subject, and kie = 0.567 +/- 0.065, kA = 0.479 +/- 0.031, and k3 = 0.667 +/- 0.094 min-1 (n = 6) for the other subject. The respective equilibrium exchange rates for these cells, namely the products of kie and cellular Na+ contents, were 1.10 +/- 0.16 and 1.19 +/- 0.24 nmole/10(5) cells. Using the exponential curve parameters, analytical solutions of a serial model and a parallel model with three compartments were performed. According to these analyses the major portion of the cellular Na+ comprises a fast exchangeable cellular compartment. The relative size of this compartment (expressed as a fraction of total cellular Na+ content) for fibroblasts of the two subjects was 96.2 and 89.2% for the serial model and 96.1 and 89.3% according to the parallel model.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- L Hopp
- Hypertension Research Center, University of Medicine and Dentistry of New Jersey, Newark 07103
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Kuriyama S, Nakamura A, Hopp L, Fine BP, Kino M, Cragoe E, Aviv A. Angiotensin II effect on 22Na+ transport in vascular smooth muscle cells. J Cardiovasc Pharmacol 1988; 11:139-46. [PMID: 2452306] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
It is well established that angiotensin II (AII) rapidly increases free cytosolic Ca2+ in vascular smooth muscle cells (VSMCs). Several studies have indicated that the hormone also plays a role in Na+-K+ regulation of these cells. In this study, we explored the mechanism of AII effect on 22Na+ transport in cultured rat VSMCs. The 22Na+ washout from these cells was described by three exponents with exponential factors k1 greater than k2 greater than k3. In 1.8 mM Ca2+ medium, AII (10(-9)-10(-6) M) increased (in a dose response manner) the k1 value, and consequently the initial washout rate constant (kei) for the isotope. AII had no effect on kei in Ca2+-deficient medium or in the presence of ouabain. Amiloride (10(-3) M) and verapamil (10(-5) M) abolished the AII induced increase in kei. These findings are consistent with angiotensin II stimulation of an amiloride-sensitive Na+ transport, which is likely to represent the Na+/H+ antiport. In cultured VSMCs, the sustained stimulation by AII of this transport system requires the presence of extracellular Ca2+ and its influx into these cells.
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Affiliation(s)
- S Kuriyama
- Hypertension Research Unit, University of Medicine and Dentistry of New Jersey, Newark 07103
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Suwa M, Hirota Y, Kino M, Saito T, Yoneda Y, Kawamura K. [Noninvasive estimation of left ventricular end-systolic pressure]. J Cardiol 1987; 17:845-51. [PMID: 3506609] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A method for noninvasively determining left ventricular (LV) end-systolic pressure (ESP) using carotid pulse tracings and cuff-measured blood pressure was re-evaluated. It was validated during diagnostic cardiac catheterization in 60 patients with cardiovascular diseases. LVESP calculated by this method and systolic blood pressure measured by the cuff were compared with aortic dicrotic notch pressures obtained by a catheter-tip manometer system as true LVESP. The calculated ESP was measured by the following formula; [the ratio of the excursion of dicrotic notch (b) to the peak (a) in carotid pulse tracings: (b/a) x pulse pressure] + diastolic blood pressure. This calculated ESP had a high correlation coefficient with true ESP invasively measured (r = 0.96), but was estimated to be 5.3 +/- 5.0 mmHg less than true ESP. Systolic blood pressure, used as a noninvasive index of ESP, accurately estimated ESP, but it was higher by 14.8 +/- 11.2 mmHg (r = 0.84). Calculated ESP measured by the present method was not affected by age or systemic vascular resistance. This is a reliable noninvasive means of estimating LV end-systolic pressure. Compared with the peak arterial pressure, this is a better parameter for the analysis of LV contractility, such as stress-shortening, and end-systolic pressure-volume relations.
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Affiliation(s)
- M Suwa
- Department of Internal Medicine, Osaka Medical College, Takatsuki
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Nishimura H, Nishioka A, Kubo S, Suwa M, Kino M, Kawamura K. Multifactorial evaluation of blood pressure fall upon hospitalization in essential hypertensive patients. Clin Sci (Lond) 1987; 73:135-41. [PMID: 3652621 DOI: 10.1042/cs0730135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/06/2023]
Abstract
1. Studies were prospectively performed on 72 hospitalized patients with essential hypertension. Blood pressure was normalized within 1 week of admission in 33 patients (group I), but did not decrease in 39 patients (group II). To determine the factors that differentiate group I from group II, cardio-renal haemodynamic and endocrinological indices were evaluated using multivariate analysis. 2. Systolic, diastolic and mean blood pressures on admission were higher in group II (P less than 0.001), whose optic fundi showed more severe changes (P less than 0.001). Although group II had greater left ventricular posterior wall thickness (P less than 0.02), left ventricular mass index (P less than 0.05) and systemic vascular resistance (P less than 0.01) on echocardiography, their cardiac index and ejection fraction were comparable with those of group I. 3. Renal blood flow (P less than 0.05) and glomerular filtration rate (P less than 0.01) were lower in group II than in group I. Renal vascular resistance was more elevated (P less than 0.01) in group II than in group I. 4. After severe sodium depletion and ambulation, group I showed a greater increase in plasma noradrenaline and adrenaline (P less than 0.05). On multivariate analysis, those with lower systolic blood pressure, better renal function and more reactive sympathetic nervous system were discriminated as group I. 5. These data suggest that group I patients have lower systolic blood pressure on admission, greater sympathetic reactivity and better renal function, all of which contribute to their spontaneous blood pressure fall after admission.
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Affiliation(s)
- H Nishimura
- Department of Internal Medicine, Osaka Medical College, Japan
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Nakayama Y, Shimizu G, Hirota Y, Saito T, Kino M, Kitaura Y, Kawamura K. Functional and histopathologic correlation in patients with dilated cardiomyopathy: an integrated evaluation by multivariate analysis. J Am Coll Cardiol 1987; 10:186-92. [PMID: 3597987 DOI: 10.1016/s0735-1097(87)80178-x] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
To correlate left ventricular function and histologic features in patients with dilated cardiomyopathy, precise indexes of hemodynamics and semiquantitative histologic data were combined for multivariate analysis. Right endomyocardial biopsy was performed at the time of cardiac catheterization. Five hemodynamic indexes were used for functional assessment: ejection fraction, ratio of end-systolic stress to volume index, end-diastolic stress, time constant (T) of left ventricular pressure fall, and end-systolic stress. Six histologic findings (disarray of myofibers, hypertrophy of myofibers, scarcity of myofibrils, nuclear changes of myofibers, vacuolization of myofibers and proliferation of collagen fibers) were graded from (-) to (4+). Each finding was assigned to category (-) or (+) according to the absence or presence of significant abnormality. Ordinary statistical analysis revealed that, although ejection fraction was lower in category (+) for proliferation of collagen fibers, ratio of end-systolic to volume index was reduced for category (+) of hypertrophy of myofibers. A significant correlation was present between hypertrophy of myofibers and proliferation of collagen fibers by Spearman rank correlation. When principal component analysis was applied to the hemodynamic data, two principal components could be extracted. Fisher's discriminant analysis could clearly differentiate two categories (-) and (+) in the semiquantitative histologic finding of proliferation of collagen fibers. The analysis indicated that contractility was reduced with elevated afterload in that category (+). Thus, proliferation of collagen fibers may play a pivotal role in deteriorating contractility in patients with dilated cardiomyopathy.
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Hirota Y, Saito T, Kita Y, Kino M, Kitaura Y, Kubo S, Kawamura K. Intravenous isosorbide dinitrate infusion in the management of unstable angina pectoris refractory to conventional medical therapy. Jpn Circ J 1987; 51:617-23. [PMID: 3669269 DOI: 10.1253/jcj.51.617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
During the past 2 years, 102 patients were treated for unstable angina pectoris (AP) in our department. Fifteen of them had recurrent chest pain at rest despite treatment with various anti-anginal agents, or prolonged chest pain unresponsive to sublingual nitroglycerin; they received intravenous isosorbide dinitrate (ISDN) infusion. A rapid bolus injection of 2 to 6 mg followed by an infusion of 2 to 5 mg/hr was given to 10 patients with acute chest pain, and 5 patients, who were free of chest pain at the time, but had repeated episodes of angina in the past 24 hours, were given ISDN infusion without a bolus injection. Chest pain disappeared completely in 13 patients, but recurred in 2 of them when the dose was tapered. Two other patients experienced recurrent chest pain during ISDN infusion, and additional boluses were given. The hospital course was uneventful in 11 patients. Four patients who had recurrent anginal attacks underwent emergency coronary cineangiography under intraaortic ballon counterpulsation and aorto-coronary bypass surgery. There were no hospital deaths, no one had subsequent acute myocardial infarctions, and only 2 patients had mild to moderate headache as a side effect. Although the patient population is small, intravenous ISDN infusion is useful in the management of severe unstable AP.
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Affiliation(s)
- Y Hirota
- Department of Internal Medicine, Osaka Medical College, Takatsuki, Japan
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Abstract
In order to elucidate changes in cell transport behavior of cultured human skin fibroblasts in response to acute serum depletion, we performed uptake and washout of 22Na+ and 86Rb+ as well as measurements of the intracellular Na+ and K+ levels in the presence and absence of ouabain. Pronounced and lasting increase in cellular Na+ and decrease in K+ were observed after removal of fetal bovine serum (FBS) from the medium. The sum of the Na+ and K+ contents (nEq/10(5) cells) was lower in FBS-free medium (mean +/- SD; 17.3 +/- 2.2) than in FBS-containing medium (26.2 +/- 3.8; P less than .02). Simultaneously, a decrease in cellular water volume was detected in the FBS-free medium. The cation uptake and washout data suggest that FBS removal primarily renders the cells more permeable to Na+ and K+ with a secondary stimulation of the ouabain-sensitive Na+ extrusion mechanism. FBS at a concentration of 0.2% prevented approximately 50% of the maximal increase in the 86Rb+ washout rate constant associated with FBS depletion. Ouabain (2 microM) produced an increase in the 86Rb+ washout rate constant. This effect was substantially larger in cells subjected to medium without FBS (from 0.0303 to 0.2500 min-1) than in fibroblasts incubated in medium with FBS (from 0.0107 to 0.0487 min-1). The cellular K+ content was drastically reduced by ouabain to a level not different in medium with or without FBS (33.9 +/- 4.5 to 1.75 +/- 0.38 and 16.7 +/- 1.4 to 1.4 +/- 0.13 nEq/10(5) cells, respectively). The 22Na+ washout data exhibited a three-exponential pattern. Analytical solutions of the washout data by means of two models (serial and parallel) with three compartments showed that FBS depletion resulted in increase of the size of all three compartments. It is concluded that in cultured human skin fibroblasts, FBS is essential to the maintenance of a normal Na+ and K+ homeostasis. The removal of FBS results in dramatic permutation of this homeostasis that develops within minutes and lasts for hours.
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Abstract
The washout of Na+ isotopes from tissues and cells is quite complex and not well defined. To further gain insight into this process, we have studied 22Na+ washout from cultured Wistar rat skin fibroblasts and vascular smooth muscle cells (VSMCs). In these preparations, 22Na+ washout is described by a general three-exponential function. The exponential factor of the fastest component (k1) and the initial exchange rate constant (kie) of cultured fibroblasts decrease in magnitude in response to incubation in K+-deficient medium or in the presence of ouabain and increase in magnitude when the cells are incubated in a Ca++-deficient medium. As the magnitude of the kie declines (in the presence of ouabain) to the level of the exponential factor of the middle component (k2), 22Na+ washout is adequately described by a two-exponential function. When the kie is further diminished (in the presence of both ouabain and phloretin) to the range of the exponential factor of the slowest component (k3), the washout of 22Na+ is apparently monoexponential. Calculations of the cellular Na+ concentrations, based on the 22Na+ activity in the cells at the initiation of the washout experiments, and the medium specific activity agree with atomic absorption spectrometry measurements of the cellular concentration of this ion. Thus, all three components of 22Na+ washout from cultured rat cells are of cellular origin. Using the exponential parameters, compartmental analyses of two models (in parallel and in series) with three cellular Na+ pools were performed. The results indicate that, independent of the model chosen, the relative size of the largest Na+ pool is 92-93% in fibroblasts and approximately 96% in VSMCs. This pool is most likely to represent the cytosol.
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