1
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Onuki S, Kawai Y, Masunaga H, Ohta N, Kikuchi R, Ashizawa M, Nabae Y, Matsumoto H. All-Perfluorosulfonated-Ionomer Composite Membranes Containing Blow-Spun Fibers: Effect of a Thin Fiber Framework on Proton Conductivity and Mechanical Properties. ACS Appl Mater Interfaces 2024; 16:10682-10691. [PMID: 38381136 PMCID: PMC10910440 DOI: 10.1021/acsami.3c17643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/30/2024] [Accepted: 02/05/2024] [Indexed: 02/22/2024]
Abstract
In this study, thin fiber composite polymer electrolyte membranes (PEMs) were prepared using short side-chain perfluorosulfonic acid (PFSA) ionomers, Aquivion, to create composite PEMs with improved proton conductivity and improved mechanical properties. PFSA thin fiber webs prepared by blow spinning and successive hot pressing were used as the porous substrate. Herein, PFSA ionomers were used for both the substrate and the matrix of the composite PEMs, and their structures, properties, and fuel cell performance were characterized. By adding the PFSA thin fiber webs to the matrix, the proton conductivity was enhanced and the mechanical properties were slightly improved. The prepared PFSA thin fiber composite PEM showed better FC performance than that of the pristine PFSA one for the high-temperature low-humidity condition in addition to the low-temperature high-humidity one. To the best of our knowledge, this is the first report on the all PFSA composite membranes containing a PFSA thin fiber framework.
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Affiliation(s)
- Shuta Onuki
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yoshiki Kawai
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hiroyasu Masunaga
- Japan
Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Noboru Ohta
- Japan
Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Ryohei Kikuchi
- Materials
Analysis Division, Open Facility Center, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Minoru Ashizawa
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuta Nabae
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hidetoshi Matsumoto
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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2
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Matsuhisa N, Niu S, O'Neill SJK, Kang J, Ochiai Y, Katsumata T, Wu HC, Ashizawa M, Wang GJN, Zhong D, Wang X, Gong X, Ning R, Gong H, You I, Zheng Y, Zhang Z, Tok JBH, Chen X, Bao Z. High-frequency and intrinsically stretchable polymer diodes. Nature 2021; 600:246-252. [PMID: 34880427 DOI: 10.1038/s41586-021-04053-6] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 09/24/2021] [Indexed: 11/09/2022]
Abstract
Skin-like intrinsically stretchable soft electronic devices are essential to realize next-generation remote and preventative medicine for advanced personal healthcare1-4. The recent development of intrinsically stretchable conductors and semiconductors has enabled highly mechanically robust and skin-conformable electronic circuits or optoelectronic devices2,5-10. However, their operating frequencies have been limited to less than 100 hertz, which is much lower than that required for many applications. Here we report intrinsically stretchable diodes-based on stretchable organic and nanomaterials-capable of operating at a frequency as high as 13.56 megahertz. This operating frequency is high enough for the wireless operation of soft sensors and electrochromic display pixels using radiofrequency identification in which the base-carrier frequency is 6.78 megahertz or 13.56 megahertz. This was achieved through a combination of rational material design and device engineering. Specifically, we developed a stretchable anode, cathode, semiconductor and current collector that can satisfy the strict requirements for high-frequency operation. Finally, we show the operational feasibility of our diode by integrating it with a stretchable sensor, electrochromic display pixel and antenna to realize a stretchable wireless tag. This work is an important step towards enabling enhanced functionalities and capabilities for skin-like wearable electronics.
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Affiliation(s)
- Naoji Matsuhisa
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA.,Innovative Center for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.,Department of Electronics and Electrical Engineering, Keio University, Yokohama, Japan.,Japan Science and Technology Agency, PRESTO, Kawaguchi, Japan
| | - Simiao Niu
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | | | - Jiheong Kang
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Yuto Ochiai
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Toru Katsumata
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA.,Corporate Research and Development, Performance Materials Technology Center, Asahi Kasei Corporation, Fuji, Japan
| | - Hung-Chin Wu
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Minoru Ashizawa
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA.,Department of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | | | - Donglai Zhong
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Xuelin Wang
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA.,School of Medical Science and Engineering, Beihang University, Beijing, China
| | - Xiwen Gong
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Rui Ning
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
| | - Huaxin Gong
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Insang You
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Yu Zheng
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Zhitao Zhang
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Jeffrey B-H Tok
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Xiaodong Chen
- Innovative Center for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Zhenan Bao
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA.
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3
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Shinkawa M, Motai K, Eguchi K, Takarada W, Ashizawa M, Masunaga H, Ohta N, Hayamizu Y, Matsumoto H. Preparation of Perfluorosulfonated Ionomer Nanofibers by Solution Blow Spinning. Membranes (Basel) 2021; 11:389. [PMID: 34070598 PMCID: PMC8228795 DOI: 10.3390/membranes11060389] [Citation(s) in RCA: 6] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/12/2021] [Accepted: 05/22/2021] [Indexed: 01/19/2023]
Abstract
In this work, we report the preparation of high-purity perfluorosulfonated ionomer (Nafion) nanofibers (NFs) via solution blow spinning (SBS). Fiber formation in solution jet spinning is strongly dependent on the structure of the spinning solution. Upon adding a small amount of poly(ethyleneoxide) (PEO) as a spinning aid to Nafion dispersion, most of the highly ordered Nafion aggregate disappeared, allowing the stable production of bead-free and smooth high-purity NFs (Nafion/PEO = 99/1) by SBS. The microstructure of the blowspun Nafion NFs differed from that of electrospun NFs. In the blowspun NFs, incomplete microphase separation between hydrophilic (ionic) and hydrophobic domains was observed, but the crystallization of CF2-CF2 chains was enhanced owing to the high extensional strain rate and rapid solidification during SBS. These findings provide fundamental information for the preparation and characterization of blowspun Nafion NFs.
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Affiliation(s)
- Masahiro Shinkawa
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Kazunori Motai
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Keita Eguchi
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Wataru Takarada
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Minoru Ashizawa
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan; (H.M.); (N.O.)
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan; (H.M.); (N.O.)
| | - Yuhei Hayamizu
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; (M.S.); (K.M.); (K.E.); (W.T.); (M.A.); (Y.H.)
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4
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Saito Y, Ashizawa M, Matsumoto H. Mesoporous Hydrated Graphene Nanoribbon Electrodes for Efficient Supercapacitors: Effect of Nanoribbon Dispersion on Pore Structure. BCSJ 2020. [DOI: 10.1246/bcsj.20200161] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yoshitaka Saito
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Minoru Ashizawa
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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5
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Kase K, Saito M, Yamada L, Nakajima S, Ashizawa M, Kanke Y, Hanayama H, Onozawa H, Okayama H, Endo H, Fujita S, Sakamoto W, Saze Z, Momma T, Mimura K, Ohki S, Kono K. 152P ARID1A deficiency in EBV-positive gastric cancer is partially regulated by EBV-encoded miRNAs, but not by DNA promotor hypermethylation. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.10.173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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6
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Yamada L, Saito M, Kase K, Nakajima S, Endo E, Ujiie D, Min A, Ashizawa M, Matsumoto T, Kanke Y, Nakano H, Ito M, Onozawa H, Okayama H, Fujita S, Sakamoto W, Saze Z, Momma T, Mimura K, Kono K. 75P The evaluation of selective sensitivity of EZH2 inhibitors based on synthetic lethality in ARID1A-deficient gastric cancer. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.10.095] [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: 11/16/2022] Open
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7
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Kohara A, Hasegawa T, Ashizawa M, Hayashi Y, Kawauchi S, Masunaga H, Ohta N, Matsumoto H. Quinoidal bisthienoisatin based semiconductors: Synthesis, characterization, and carrier transport property. Nano Select 2020. [DOI: 10.1002/nano.202000053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Akihiro Kohara
- Department of Materials Science and Engineering Tokyo Institute of Technology Tokyo Japan
| | - Tsukasa Hasegawa
- Department of Materials Science and Engineering Tokyo Institute of Technology Tokyo Japan
| | - Minoru Ashizawa
- Department of Materials Science and Engineering Tokyo Institute of Technology Tokyo Japan
| | - Yoshihiro Hayashi
- Department of Chemical Science and Engineering Tokyo Institute of Technolog Tokyo Japan
| | - Susumu Kawauchi
- Department of Chemical Science and Engineering Tokyo Institute of Technolog Tokyo Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring‐8 Sayo Japan
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring‐8 Sayo Japan
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering Tokyo Institute of Technology Tokyo Japan
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8
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Wu J, Lee HJ, You L, Luo X, Hasegawa T, Huang KC, Lin P, Ratliff T, Ashizawa M, Mei J, Cheng JX. Functionalized NIR-II Semiconducting Polymer Nanoparticles for Single-cell to Whole-Organ Imaging of PSMA-Positive Prostate Cancer. Small 2020; 16:e2001215. [PMID: 32307923 DOI: 10.1002/smll.202001215] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/22/2020] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
Development of molecular probes holds great promise for early diagnosis of aggressive prostate cancer. Here, 2-[3-(1,3-dicarboxypropyl) ureido] pentanedioic acid (DUPA)-conjugated ligand and bis-isoindigo-based polymer (BTII) are synthesized to formulate semiconducting polymer nanoparticles (BTII-DUPA SPN) as a prostate-specific membrane antigen (PSMA)-targeted probe for prostate cancer imaging in the NIR-II window. Insights into the interaction of the imaging probes with the biological targets from single cell to whole organ are obtained by transient absorption (TA) microscopy and photoacoustic (PA) tomography. At single-cell level, TA microscopy reveals the targeting efficiency, kinetics, and specificity of BTII-DUPA SPN to PSMA-positive prostate cancer. At organ level, PA tomographic imaging of BTII-DUPA SPN in the NIR-II window demonstrates superior imaging depth and contrast. By intravenous administration, BTII-DUPA SPN demonstrates selective accumulation and retention in the PSMA-positive tumor, allowing noninvasive PA detection of PSMA overexpressing prostate tumors in vivo. The distribution of nanoparticles inside the tumor tissue is further analyzed through TA microscopy. These results collectively demonstrate BTII-DUPA SPN as a promising probe for prostate cancer diagnosis by PA tomography.
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Affiliation(s)
- Jiayingzi Wu
- Department of Electrical and Computer Engineering, Boston University, Boston, MA, 02215, USA
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Hyeon Jeong Lee
- Department of Electrical and Computer Engineering, Boston University, Boston, MA, 02215, USA
| | - Liyan You
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Xuyi Luo
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Tsukasa Hasegawa
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan
| | - Kai-Chih Huang
- Department of Biomedical Engineering, Boston University, Boston, MA, 02215, USA
| | - Peng Lin
- Department of Electrical and Computer Engineering, Boston University, Boston, MA, 02215, USA
| | - Timothy Ratliff
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN, 47907, USA
- Center for Cancer Research, Purdue University, West Lafayette, IN, 47907, USA
| | - Minoru Ashizawa
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan
| | - Jianguo Mei
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Ji-Xin Cheng
- Department of Electrical and Computer Engineering, Boston University, Boston, MA, 02215, USA
- Department of Biomedical Engineering, Boston University, Boston, MA, 02215, USA
- Photonics Center, Boston University, Boston, MA, 02215, USA
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9
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10
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Affiliation(s)
- Satomi Fukushima
- Department of Organic and Polymeric MaterialsTokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Minoru Ashizawa
- Department of Organic and Polymeric MaterialsTokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Susumu Kawauchi
- Department of Organic and Polymeric MaterialsTokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
| | - Tsuyoshi Michinobu
- Department of Organic and Polymeric MaterialsTokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan
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11
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Hasegawa T, Ashizawa M, Kawauchi S, Masunaga H, Ohta N, Matsumoto H. Fluorination and chlorination effects on quinoxalineimides as an electron-deficient building block for n-channel organic semiconductors. RSC Adv 2019; 9:10807-10813. [PMID: 35515293 PMCID: PMC9062530 DOI: 10.1039/c9ra02413a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 04/01/2019] [Indexed: 11/29/2022] Open
Abstract
The quinoxalineimide (QI) unit, containing the electron-withdrawing quinoxaline and imide groups, is an electron-deficient building block for organic semiconductor materials. In this study, three fluorinated or chlorinated QIs (QI-1F, QI-2F, and QI-2Cl), have been designed and developed. We report the impact of the fluorination or chlorination of the QI unit on the electronic structures and charge carrier transport properties as compared to unsubstituted QI (QI-2H) bearing the same n-hexyl side chains. The frontier molecular orbital energy levels downshifted with the incorporation of fluorine or chlorine atoms onto the π-framework of QI. Single-crystal structure analyses revealed that all QI-based molecules have an entirely planar backbone and are packed into two-dimensional slipped stacks with diagonal electronic coupling that enables two-dimensional charge carrier transport. Notably, the doubly fluorinated or chlorinated QIs formed compact molecular packing in the single-crystal structures through an infinite intermolecular network relative to unsubstituted QI (QI-2H). The field-effect transistor-based QI molecules exhibited typical n-channel transport properties. As compared to unsubstituted QI (QI-2H), the chlorinated QI exhibited improved electron mobilities up to 7.1 × 10−3 cm2 V−1 s−1. The threshold voltages of the fluorinated or chlorinated QI devices were clearly smaller than that of QI-2H, which reflects the lowest unoccupied molecular orbital levels of the molecules. This study demonstrates that the fluorinated or chlorinated QIs are versatile building blocks in creating n-channel organic semiconductor materials. Three fluorinated or chlorinated quinoxalineimide units (QI-1F, QI-2F, and QI-2Cl) have been designed and developed.![]()
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Affiliation(s)
- Tsukasa Hasegawa
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Minoru Ashizawa
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Susumu Kawauchi
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8
- Japan
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8
- Japan
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
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12
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Seino F, Konosu Y, Ashizawa M, Kakihana Y, Higa M, Matsumoto H. Polyelectrolyte Composite Membranes Containing Electrospun Ion-Exchange Nanofibers: Effect of Nanofiber Surface Charges on Ionic Transport. Langmuir 2018; 34:13035-13040. [PMID: 30293431 DOI: 10.1021/acs.langmuir.8b02747] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Poly(vinyl alcohol) (PVA)-based ion-exchange nanofibers (IEX-NFs) and their composite polyelectrolyte membranes were prepared and characterized. The PVA-based NFs are well dispersed and form a three-dimensional network structure in the polymer matrix, Nafion. All of the prepared membranes show a similar ion-exchange capacity of ∼1.0 mmol g-1. The ionic conductivities through the PVA- b-PSS-NF/Nafion composite membranes are superior to that of the Nafion membranes, but the conductivity through the PVA-NF/Nafion composite membrane is half that of the Nafion membrane. Our electrokinetic measurements clearly indicate that a high density of ion-exchange groups on the NF surface results in a continuous ionic transport path in the polymer matrix. In addition, the mechanical strength of all of the NF-composite membranes is improved compared with that of the membranes without NF.
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Affiliation(s)
- Fumiyasu Seino
- Department of Materials Science and Engineering , Tokyo Institute of Technology , Mail Box S8-27, 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Yuichi Konosu
- Department of Materials Science and Engineering , Tokyo Institute of Technology , Mail Box S8-27, 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Minoru Ashizawa
- Department of Materials Science and Engineering , Tokyo Institute of Technology , Mail Box S8-27, 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Yuriko Kakihana
- Division of Applied Fine Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University, and Blue Energy Center for SGE Technology (BEST) , 2-16-1 Tokiwadai, Ube , Yamaguchi 755-8611 , Japan
| | - Mitsuru Higa
- Division of Applied Fine Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University, and Blue Energy Center for SGE Technology (BEST) , 2-16-1 Tokiwadai, Ube , Yamaguchi 755-8611 , Japan
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering , Tokyo Institute of Technology , Mail Box S8-27, 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
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13
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Hasegawa T, Ashizawa M, Aoyagi K, Masunaga H, Hikima T, Matsumoto H. Thiadiazole-fused Quinoxalineimide as an Electron-deficient Building Block for N-type Organic Semiconductors. Org Lett 2017; 19:3275-3278. [DOI: 10.1021/acs.orglett.7b01424] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tsukasa Hasegawa
- Department of Materials
Science and Engineering, Tokyo Institute of Technology, 2-12-1
Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Minoru Ashizawa
- Department of Materials
Science and Engineering, Tokyo Institute of Technology, 2-12-1
Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Koutarou Aoyagi
- Department of Materials
Science and Engineering, Tokyo Institute of Technology, 2-12-1
Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, 1-1-1 Kouto, Sayo, Sayo 679-5198, Japan
| | - Takaaki Hikima
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Sayo 679-5148, Japan
| | - Hidetoshi Matsumoto
- Department of Materials
Science and Engineering, Tokyo Institute of Technology, 2-12-1
Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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14
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Yuuki T, Konosu Y, Ashizawa M, Iwahashi T, Ouchi Y, Tominaga Y, Ooyabu R, Matsumoto H, Matsumoto H. Ionic Liquid-Based Electrolytes Containing Surface-Functionalized Inorganic Nanofibers for Quasisolid Lithium Batteries. ACS Omega 2017; 2:835-841. [PMID: 31457475 PMCID: PMC6641074 DOI: 10.1021/acsomega.6b00480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 02/23/2017] [Indexed: 05/21/2023]
Abstract
In the present study, surface amino-functionalized silica nanofibers (f-SiO2NFs, average diameter = 400 and 1000 nm) are used as one-dimensional (1-D) fillers of ionic liquid (IL)-based quasisolid electrolytes. On adding f-SiO2NFs to an IL (1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide, EMITFSA) containing lithium bis(trifluoromethanesulfonyl)-amide (LiTFSA), the well-dispersed 1-D nanofillers easily form a three-dimensional network structure in the IL, function as physical cross-linkers, and increase the viscosity of the composites, consequently providing a quasisolid state at a 3.5 wt % fraction of the NFs. Rheological measurements demonstrate that the prepared composites exhibit "gel-like" characteristics at 40-150 °C. All prepared composites show high ionic conductivities, on the order of 10-3 S cm-1, around room temperature. To investigate the additive effect of f-SiO2NFs in the composites, the lithium transference numbers are also evaluated. It is found that thinner NFs enhance the transference numbers of the composites. In addition, quasisolid lithium-ion cells containing the prepared composites demonstrate relatively high rate characteristics and good cycling performance at high temperature (125 °C).
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Affiliation(s)
- Takahiro Yuuki
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuichi Konosu
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Minoru Ashizawa
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Takashi Iwahashi
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yukio Ouchi
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yoichi Tominaga
- Graduate
School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Rie Ooyabu
- Department
of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science
and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hajime Matsumoto
- Department
of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science
and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hidetoshi Matsumoto
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, Mail Box S8-27, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
- E-mail:
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15
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Saito Y, Meguro M, Ashizawa M, Waki K, Yuksel R, Unalan HE, Matsumoto H. Manganese dioxide nanowires on carbon nanofiber frameworks for efficient electrochemical device electrodes. RSC Adv 2017. [DOI: 10.1039/c6ra28789a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hierarchically nanostructured composite electrodes were prepared by the electrodeposition of manganese dioxide nanowires (MnO2 NWs) with 5–20 nm diameters on electrospun carbon nanofiber (CNF) webs with diameters of 250 and 650 nm.
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Affiliation(s)
- Y. Saito
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - M. Meguro
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - M. Ashizawa
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - K. Waki
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Yokohama-shi 226-8502
- Japan
| | - R. Yuksel
- Department of Micro and Nanotechnology
- Middle East Technical University
- Ankara 06800
- Turkey
| | - H. E. Unalan
- Department of Metallurgical and Materials Engineering
- Middle East Technical University
- 06800 Ankara
- Turkey
| | - H. Matsumoto
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Meguro-ku
- Japan
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16
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Aiba M, Higashihara T, Ashizawa M, Otsuka H, Matsumoto H. Triggered Structural Control of Dynamic Covalent Aromatic Polyamides: Effects of Thermal Reorganization Behavior in Solution and Solid States. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b01778] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Motohiro Aiba
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
| | - Tomoya Higashihara
- Department
of Polymer Science and Engineering, Faculty of Engineering, Yamagata University,
4-3-16 Jonan, Yonezawa City, Yamagata 992-8510, Japan
| | - Minoru Ashizawa
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
| | - Hideyuki Otsuka
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
| | - Hidetoshi Matsumoto
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
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17
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Hasegawa T, Ashizawa M, Hiyoshi J, Kawauchi S, Mei J, Bao Z, Matsumoto H. An ultra-narrow bandgap derived from thienoisoindigo polymers: structural influence on reducing the bandgap and self-organization. Polym Chem 2016. [DOI: 10.1039/c5py01870f] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Six conjugated polymers based on thienoisoindigo (TII) and thiophene-flanked diketopyrrolopyrrole (TDPP) units bearing either branched-alkyl or siloxane-terminated alkyl solubilizing groups have been synthesized.
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Affiliation(s)
- Tsukasa Hasegawa
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Minoru Ashizawa
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Meguro-ku
- Japan
- Department of Chemical Engineering
| | - Junya Hiyoshi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Susumu Kawauchi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Jianguo Mei
- Department of Chemistry
- Purdue University
- Indiana
- USA
- Department of Chemical Engineering
| | - Zhenan Bao
- Department of Chemical Engineering
- Stanford University
- Stanford
- USA
| | - Hidetoshi Matsumoto
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Meguro-ku
- Japan
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18
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Ashizawa M, Hasegawa T, Kawauchi S, Masunaga H, Hikima T, Sato H, Matsumoto H. Influence of structure–property relationships of two structural isomers of thiophene-flanked diazaisoindigo on carrier-transport properties. RSC Adv 2016. [DOI: 10.1039/c6ra17424h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two structural isomers of thiophene-flanked diazaisoindigo, 6,6′-substituted 6,6′-T-DAII and 5,5′-substituted 5,5′-T-DAII, have been synthesized to study the influence of the connecting modes on the carrier-transport properties.
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Affiliation(s)
- Minoru Ashizawa
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Tsukasa Hasegawa
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Susumu Kawauchi
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8
- Japan
| | | | | | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
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19
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Hasegawa T, Aoyagi K, Ashizawa M, Konosu Y, Kawauchi S, Sariciftci NS, Matsumoto H. Quinoxalineimide as a Novel Electron-accepting Building Block for Organic Optoelectronics. CHEM LETT 2015. [DOI: 10.1246/cl.150407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tsukasa Hasegawa
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
| | - Koutarou Aoyagi
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
| | - Minoru Ashizawa
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
| | - Yuichi Konosu
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
| | - Susumu Kawauchi
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
| | | | - Hidetoshi Matsumoto
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology
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20
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Yuan Y, Michinobu T, Satoh N, Ashizawa M, Han L. Efficient Synthesis and Photosensitizer Performance of Nonplanar Organic Donor-Acceptor Molecules. J Nanosci Nanotechnol 2015; 15:5856-5866. [PMID: 26369162 DOI: 10.1166/jnn.2015.10032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nonplanar organic donor-acceptor molecules bearing a carboxylic acid group were synthesized by the formal [2+2] cycloaddition-retroelectrocyclization reaction between aniline-substituted alkynes and tetracyanoethylene (TCNE) or 7,7,8,8-tetracyanoquinodimethane (TCNQ). This reaction offers an atom-economic one-step approach to donor-acceptor chromophores in satisfactory high yields. The resulting donor-acceptor molecules were characterized by conventional analytical techniques. In addition, the nonplanarity and intermolecular interactions were investigated by X-ray crystallography. The energy levels and intramolecular charge-transfer (CT), evaluated by UV-Vis-near IR spectroscopy and electrochemistry, suggested that there is a linear correlation between the optical and electrochemical band gaps. Based on these structural and electronic analyses, the photosensitizer performances of the donor-acceptor molecules in dye-sensitized solar cells (DSSCs) were initially investigated using TiO2 or SnO2 electrodes. Although the power conversion efficiencies were limited, the incident-photon-to-current-conversion efficiency (IPCE) spectra indicated a better photocurrent generation for the devices on SnO2 as compared to those on TiO2.
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21
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Miyamura D, Yaeda J, Himejima M, Ashizawa M, Kanda J, Kako S, Kanda Y, Daikoku A. Judgmental criteria by physical therapists for the patients receiving allogeneic hematopoietic stem cell transplantation in Japan. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Kikuchi M, Akahoshi Y, Nakano H, Ugai T, Wada H, Yamasaki R, Sakamoto K, Kawamura K, Ishihara Y, Sato M, Ashizawa M, Terasako-Saito K, Kimura S, Yamazaki R, Kanda J, Kako S, Nishida J, Kanda Y. Risk factors for pre- and post-engraftment bloodstream infections after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2015; 17:56-65. [PMID: 25580541 DOI: 10.1111/tid.12345] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/29/2014] [Accepted: 11/03/2014] [Indexed: 11/26/2022]
Abstract
BACKGROUND Bloodstream infections (BSI) are frequently observed after allogeneic hematopoietic stem cell transplant (HSCT), and could cause morbidity and mortality. METHODS We retrospectively evaluated the incidence, characteristics of, and risk factors for BSI at both pre- and post-engraftment in 209 adult HSCT patients at our institute between June 2006 and December 2013. The median age at transplantation was 45 years (range, 15-65). A total of 122 patients received bone marrow, 68 received peripheral blood stem cells, and 19 received umbilical cord blood. RESULTS The cumulative incidences of pre- and post-engraftment BSI were 38.9% and 17.2%, respectively. Nine patients had both pre- and post-engraftment BSI. In the pre- and post-engraftment periods, respectively, 67.4% and 84.1% of isolates were gram-positive bacteria (GPB), 28.3% and 11.4% were gram-negative bacteria (GNB), and 4.3% and 4.5% were fungi. Coagulase-negative staphylococci were the most commonly isolated GPB, while Stenotrophomonas maltophilia and Pseudomonas aeruginosa were the most commonly isolated GNB. Pre-engraftment BSI was associated with an increased risk of death. Overall survival at day 180 for patients with or without pre-engraftment BSI was 70.0% and 82.7%, respectively (P = 0.02). CONCLUSIONS Risk factors for BSI in the pre-engraftment period were the interval between diagnosis and transplantation (261 days or more), engraftment failure, and high-risk disease status at HSCT in a multivariate analysis. No significant risk factor for BSI in the post-engraftment period was identified by a univariate analysis. These findings may be useful for deciding upon empiric antibacterial treatment for HSCT recipients.
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Affiliation(s)
- M Kikuchi
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan
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23
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Kimura SI, Murata T, Akahoshi Y, Nakano H, Ugai T, Wada H, Yamasaki R, Ishihara Y, Kawamura K, Sakamoto K, Ashizawa M, Sato M, Terasako-Saito K, Nakasone H, Kikuchi M, Yamazaki R, Kako S, Kanda J, Tanihara A, Nishida J, Kanda Y. Economic evaluation of a preemptive treatment strategy for invasive fungal infection in neutropenic patients with hematological diseases. Eur J Clin Microbiol Infect Dis 2015; 34:951-61. [PMID: 25577175 DOI: 10.1007/s10096-014-2311-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 12/29/2014] [Indexed: 02/03/2023]
Abstract
We compared the expected medical costs of empirical and preemptive treatment strategies for invasive fungal infection in neutropenic patients with hematological diseases. Based on the results of two clinical trials with different backgrounds reported by Oshima et al. [J Antimicrob Chemother 60(2):350-355; Oshima study] and Cordonnier et al. [Clin Infect Dis 48(8):1042-1051; PREVERT study], we developed a decision tree model that represented the outcomes of empirical and preemptive treatment strategies, and estimated the expected medical costs of medications and examinations in the two strategies. We assumed that micafungin was started in the empirical group at 5 days after fever had developed, while voriconazole was started in the preemptive group only when certain criteria, such as positive test results of imaging studies and/or serum markers, were fulfilled. When we used an incidence of positive test results of 6.7 % based on the Oshima study, the expected medical costs of the empirical and preemptive groups were 288,198 and 150,280 yen, respectively. Even in the case of the PREVERT study, in which the incidence of positive test results was 32.9 %, the expected medical costs in the empirical and preemptive groups were 291,871 and 284,944 yen, respectively. A sensitivity analysis indicated that the expected medical costs in the preemptive group would exceed those in the empirical group when the incidence of positive test results in the former was over 34.4 %. These results suggest that a preemptive treatment strategy can be expected to reduce medical costs compared with empirical therapy in most clinical settings.
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Affiliation(s)
- S-I Kimura
- Division of Hematology, Saitama Medical Center, Jichi Medical University, 1-847 Amanuma, Omiya-ku, Saitama-city, Saitama, 330-8503, Japan
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24
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Abstract
A novel planar π-conjugated small molecule, benzothienoisoindigo (BTII), in which additional benzene rings are fused with the thieoisoindigo (TII) unit, has been designed and synthesized.
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Affiliation(s)
- Tsukasa Hasegawa
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Minoru Ashizawa
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Hidetoshi Matsumoto
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
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25
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Terasako-Saito K, Nakasone H, Tanaka Y, Yamazaki R, Sato M, Sakamoto K, Ishihara Y, Kawamura K, Akahoshi Y, Hayakawa J, Wada H, Harada N, Nakano H, Kameda K, Ugai T, Yamasaki R, Ashizawa M, Kimura SI, Kikuchi M, Tanihara A, Kanda J, Kako S, Nishida J, Kanda Y. Persistence of recipient-derived as well as donor-derived clones of cytomegalovirus pp65-specific cytotoxic T cells long after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2014; 16:930-40. [DOI: 10.1111/tid.12318] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 09/14/2014] [Indexed: 11/27/2022]
Affiliation(s)
- K. Terasako-Saito
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakasone
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Tanaka
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamazaki
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Sato
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Sakamoto
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Ishihara
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kawamura
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Akahoshi
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Hayakawa
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Wada
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - N. Harada
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakano
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kameda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - T. Ugai
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamasaki
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Ashizawa
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S.-I. Kimura
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Kikuchi
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - A. Tanihara
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Kanda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S. Kako
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Nishida
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Kanda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama Japan
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26
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Yamazaki R, Tanaka Y, Nakasone H, Sato M, Terasako-Saito K, Sakamoto K, Akahoshi Y, Nakano H, Ugai T, Yamasaki R, Wada H, Ishihara Y, Kawamura K, Ashizawa M, Kimura SI, Kikuchi M, Kako S, Kanda J, Tanihara A, Nishida J, Kanda Y. Allotype analysis to determine the origin of cytomegalovirus immunoglobulin-G after allogeneic stem cell transplantation. Transpl Infect Dis 2014; 16:904-13. [DOI: 10.1111/tid.12304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/17/2014] [Accepted: 08/07/2014] [Indexed: 11/26/2022]
Affiliation(s)
- R. Yamazaki
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Tanaka
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakasone
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Sato
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Terasako-Saito
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Sakamoto
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Akahoshi
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Nakano
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - T. Ugai
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - R. Yamasaki
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - H. Wada
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Ishihara
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - K. Kawamura
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Ashizawa
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S.-I. Kimura
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - M. Kikuchi
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - S. Kako
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Kanda
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - A. Tanihara
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - J. Nishida
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
| | - Y. Kanda
- Division of Hematology; Department of Internal Medicine; Saitama Medical Center; Jichi Medical University; Saitama Japan
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27
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Ishibe S, Anzai K, Nakamura J, Konosu Y, Ashizawa M, Matsumoto H, Tominaga Y. Ion-conductive and mechanical properties of polyether/silica thin fiber composite electrolytes. REACT FUNCT POLYM 2014. [DOI: 10.1016/j.reactfunctpolym.2014.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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28
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Nakasone H, Tanaka Y, Yamazaki R, Terasako K, Sato M, Sakamoto K, Yamasaki R, Wada H, Ishihara Y, Kawamura K, Machishima T, Ashizawa M, Kimura SI, Kikuchi M, Tanihara A, Kanda J, Kako S, Nishida J, Kanda Y. Single-cell T-cell receptor-β analysis of HLA-A*2402-restricted CMV- pp65-specific cytotoxic T-cells in allogeneic hematopoietic SCT. Bone Marrow Transplant 2013; 49:87-94. [DOI: 10.1038/bmt.2013.122] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/19/2013] [Accepted: 05/23/2013] [Indexed: 11/09/2022]
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29
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Kawamura K, Wada H, Yamasaki R, Ishihara Y, Sakamoto K, Ashizawa M, Sato M, Machishima T, Terasako K, Kimura SI, Kikuchi M, Nakasone H, Yamazaki R, Kanda J, Kako S, Tanihara A, Nishida J, Kanda Y. Low-dose acyclovir prophylaxis for the prevention of herpes simplex virus disease after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2013; 15:457-65. [PMID: 23895431 DOI: 10.1111/tid.12118] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 01/22/2013] [Accepted: 02/17/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND Currently, acyclovir (ACV) at 1000 mg/day is widely used as prophylaxis in the early phase of hematopoietic stem cell transplant (HSCT) in Japan. However, low-dose ACV (200 mg/day) has been shown to prevent varicella zoster virus reactivation in the middle and late phases of HSCT. METHODS Therefore, in this study, we decreased the dose of ACV to 200 mg/day in the early phase after HSCT. We analyzed 93 consecutive herpes simplex virus (HSV)-seropositive patients who underwent allogeneic HSCT for the first time in our center between June 2007 and December 2011. RESULTS Before August 2009, 38 patients received oral ACV at 1000 mg/day (ACV1000) until day 35 after HSCT, whereas 55 patients received oral ACV at 200 mg/day (ACV200) after September 2009. We compared the cumulative incidence of HSV infection in the 2 groups. Oral ACV was changed to intravenous administration because of intolerance in 66% and 45% of the patients in the ACV1000 and ACV200 groups, respectively (P = 0.060). The probability of severe stomatitis (Bearman grade II-III) was 76% and 60% in the ACV1000 and ACV200 groups, respectively (P = 0.12). The number of patients who developed HSV disease before day 100 after HSCT was 0 in the ACV1000 group and 2 in the ACV200 group, with a cumulative incidence of 3.6% (P = 0.43). HSV disease in the latter 2 patients was limited to the lips and tongue and was successfully treated with ACV or valacyclovir at a treatment dose. CONCLUSION ACV at 200 mg/day appeared to be effective for preventing HSV disease in the early phase after HSCT.
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Affiliation(s)
- K Kawamura
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan
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Matsumoto H, Imaizumi S, Konosu Y, Ashizawa M, Minagawa M, Tanioka A, Lu W, Tour JM. Electrospun composite nanofiber yarns containing oriented graphene nanoribbons. ACS Appl Mater Interfaces 2013; 5:6225-31. [PMID: 23763449 DOI: 10.1021/am401161b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The graphene nanoribbon (GNR)/carbon composite nanofiber yarns were prepared by electrospinning from poly(acrylonitrile) (PAN) containing graphene oxide nanoribbons (GONRs), and successive twisting and carbonization. The electrospinning process can exert directional shear force coupling with the external electric field to the flow of the spinning solution. During electrospinning, the well-dispersed GONRs were highly oriented along the fiber axis in an electrified thin liquid jet. The addition of GONRs at a low weight fraction significantly improved the mechanical properties of the composite nanofiber yarns. In addition, the carbonization of the matrix polymer enhanced not only the mechanical but also the electrical properties of the composites. The electrical conductivity of the carbonized composite yarns containing 0.5 wt % GONR showed the maximum value of 165 S cm(-1). It is larger than the maximum value of the reported electrospun carbon composite yarns. Interestingly, it is higher than the conductivities of both the PAN-based pristine CNF yarns (77 S cm(-1)) and the monolayer GNRs (54 S cm(-1)). These results and Raman spectroscopy supported the hypothesis that the oriented GONRs contained in the PAN nanofibers effectively functioned as not only the 1-D nanofiller but also the nanoplatelet promoter of stabilization and template agent for the carbonization.
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Affiliation(s)
- Hidetoshi Matsumoto
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan.
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Sato M, Nakasone H, Wada H, Yamasaki R, Ishihara Y, Sakamoto K, Kawamura K, Ashizawa M, Machishima T, Terasako K, Kimura SI, Kikuchi M, Tanihara A, Yamazaki R, Tanaka Y, Kanda J, Kako S, Nishida J, Kanda Y. Prediction of infectious events by the high-sensitivity C-reactive protein level before autologous hematopoietic cell transplantation for lymphoma and multiple myeloma. Transpl Infect Dis 2013; 15:E169-71. [PMID: 23782409 DOI: 10.1111/tid.12102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/04/2013] [Accepted: 03/27/2013] [Indexed: 11/30/2022]
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Affiliation(s)
- Tadashi Kawamoto
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Minoru Ashizawa
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Takehiko Mori
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology
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Robert E, Vollset SE, Botto L, Lancaster PA, Merlob P, Mastroiacovo P, Cocchi G, Ashizawa M, Sakamoto S, Orioli I. Malformation surveillance and maternal drug exposure: the MADRE project. Int J Risk Saf Med 2013; 6:75-118. [PMID: 23511545 DOI: 10.3233/jrs-1994-6201] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A project implemented within the framework of the International Clearinghouse for Birth Defect Monitoring Systems is named MADRE: MAlformation DRug Exposure surveillance. The idea is to survey the simultaneous occurrence of malformations and first-trimester drug exposures. In a 2-year period 1990-91, this has yielded 1448 infants known to have been exposed to drugs and that are known to have malformations. Cases have been reported by eight programs: Australia, Central-East France, Israel, Italy IPIMC, Italy IMER, Japan Red Cross Hospitals, Japan Maternal Health and Welfare, and South America. By searching this databank for associations between drugs and malformations, specific relationships can be detected.The 9th revision of the WHO International Classification of Diseases, adapted by the British Paediatric Association, known as ICD9/BPA is used for coding malformations. This is a hierarchical system with 5 digits as the maximum level of specification of each malformation.The ATC (Anatomical Therapeutic Chemical) classifications system is used for coding drugs. This is a multiple level, hierarchical classification with up to 7 digits for specifying each drug.Up to five drugs and malformations are coded for each case using ATC and ICD9/BPA classifications, and all observed drug-malformation pairs form the basis for the analysis. For each drug-malformation combination where three or more cases are observed, a set of 2×2 tables is formed and analyzed as in case-control studies. The odds ratio for the pair, stratified for program, gives the relative risk for the malformation in question, comparing use of the specific drug with all other drugs.Well known or controversial associations were tested in the collected material, and at this stage only one new association is suggested, that is between cardiac defects and maternal treatment with thyroid hormones. This finding has to be further explored with new data.
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Affiliation(s)
- E Robert
- Central-East France Registry of congenital malformations, Institut Européen des Génomutations, 86, rue E. Locard, F-69005 Lyon, France
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Kadoya T, Ashizawa M, Higashino T, Kawamoto T, Kumeta S, Matsumoto H, Mori T. A highly conducting organic metal derived from an organic-transistor material: benzothienobenzothiophene. Phys Chem Chem Phys 2013; 15:17818-22. [DOI: 10.1039/c3cp52881b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Ashizawa M, Oshima K, Wada H, Ishihara Y, Kawamura K, Sakamoto K, Sato M, Terasako K, Machishima T, Kimura S, Kikuchi M, Nakasone H, Okuda S, Kako S, Kanda J, Yamazaki R, Tanihara A, Nishida J, Kanda Y. Hyperbilirubinemia in the early phase after allogeneic HSCT: prognostic significance of the alkaline phosphatase/total bilirubin ratio. Bone Marrow Transplant 2012; 48:94-8. [PMID: 22750996 DOI: 10.1038/bmt.2012.130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Hyperbilirubinemia in the early phase after allogeneic hematopoietic SCT (HSCT) is due to various causes. One of the most important causes of hyperbilirubinemia is veno-occlusive disease/sinusoidal obstructive syndrome (VOD/SOS). However, the prognosis of patients who are clinically diagnosed as SOS varies. We retrospectively evaluated 82 patients who underwent their first allogeneic HSCT. GVHD prophylaxis was a combination of short-term MTX and CsA (n=77) or tacrolimus (n=5). Thirty-three patients developed hyperbilirubinemia, with a bilirubin level of at least 2 mg/dL, within 20 days after HSCT. Of these patients, 24 were diagnosed as VOD/SOS using the modified Seattle criteria. Twenty-six recovered to a bilirubin level of <2 mg/dL. We focused on the serum alkaline phosphatase/total bilirubin ratio (ALP/TB) at the onset of hyperbilirubinemia and found that it significantly predicted the recovery from hyperbilirubinemia. OS was significantly higher in patients with a lower ALP/TB ratio (P=0.00056). In addition, a lower ALP/TB ratio was associated with better survival even in patients who were clinically diagnosed as SOS (P<0.001). The ALP/TB ratio at the onset of hyperbilirubinemia may be a useful predictor for the prognosis of hyperbilirubinemia and SOS early after HSCT.
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Affiliation(s)
- M Ashizawa
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama 330-8503, Japan
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Kimura SI, Wada H, Sakamoto K, Ashizawa M, Sato M, Terasako K, Nakasone H, Kikuchi M, Okuda S, Kako S, Yamazaki R, Oshima K, Tanaka Y, Tanihara A, Nishida J, Kanda Y. L-index as a novel index to evaluate both the intensity and duration of lymphopenia after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2012; 14:364-73. [DOI: 10.1111/j.1399-3062.2012.00727.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 11/10/2011] [Accepted: 12/08/2011] [Indexed: 01/02/2023]
Affiliation(s)
- S.-I. Kimura
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - H. Wada
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - K. Sakamoto
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - M. Ashizawa
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - M. Sato
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - K. Terasako
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - H. Nakasone
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - M. Kikuchi
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - S. Okuda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - S. Kako
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - R. Yamazaki
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - K. Oshima
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - Y. Tanaka
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - A. Tanihara
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - J. Nishida
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
| | - Y. Kanda
- Division of Hematology; Saitama Medical Center; Jichi Medical University; Saitama; Japan
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Ashizawa M, Niimura T, Yu Y, Tsuboi K, Matsumoto H, Yamada R, Kawauchi S, Tanioka A, Mori T. Improved stability of organic field-effect transistor performance in oligothiophenes including β-isomers. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Suzuki J, Ashizawa M, Okuda S, Wada H, Sakamoto K, Terasako K, Sato M, Kimura SI, Kikuchi M, Nakasone H, Kako S, Yamazaki R, Oshima K, Nishida J, Kanda Y. Varicella zoster virus meningoencephalitis after allogeneic hematopoietic stem cell transplantation. Transpl Infect Dis 2012; 14:E7-12. [PMID: 22340704 DOI: 10.1111/j.1399-3062.2012.00720.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Revised: 11/21/2011] [Accepted: 11/26/2011] [Indexed: 12/01/2022]
Abstract
Although the reactivation of varicella zoster virus (VZV) is a common complication after allogeneic hematopoietic stem cell transplantation (HSCT), VZV meningoencephalitis is a rare life-threatening infectious disease after HSCT. We describe here a patient who developed VZV meningoencephalitis 2 years after human leukocyte antigen-matched unrelated HSCT for acute myeloblastic leukemia. She developed chronic graft-versus-host disease, and cyclosporine (CSA) was continued until 17 months after HSCT. Low-dose acyclovir (ACV) at 200 mg/day was administered to prevent the reactivation of VZV from day -7 to the termination of CSA. At 22 months, she suddenly developed fever, loss of consciousness, and seizure, with generalized skin rash. A high level of VZV DNA was detected in her cerebrospinal fluid (CSF). She was diagnosed to have VZV meningoencephalitis. Intravenous ACV at 30 mg/kg/day was given for 2 months. Although loss of consciousness was quickly resolved, some neurologic symptoms persisted. She did not have any known risk factors for VZV reactivation. Therefore, we should keep in mind that any HSCT recipient may develop VZV meningoencephalitis, and examination of CSF for VZV infection with an empiric administration of ACV may be recommended for HSCT recipients with central nervous system symptoms, even in the absence of skin manifestations.
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Affiliation(s)
- J Suzuki
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan
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Tsuboi K, Marcelletti E, Matsumoto H, Ashizawa M, Minagawa M, Furuya H, Tanioka A, Abe A. Preparation of poly(γ-benzyl-L-glutamate) nanofibers by electrospinning from isotropic and biphasic liquid crystal solutions. Polym J 2012. [DOI: 10.1038/pj.2011.137] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Li Y, Ashizawa M, Uchida S, Michinobu T. Colorimetric sensing of cations and anions by clicked polystyrenes bearing side chain donor–acceptor chromophores. Polym Chem 2012. [DOI: 10.1039/c2py20230a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Imaizumi S, Matsumoto H, Ashizawa M, Minagawa M, Tanioka A. Nanosize effects of sulfonated carbon nanofiber fabrics for high capacity ion-exchanger. RSC Adv 2012. [DOI: 10.1039/c2ra20103h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Li Y, Ashizawa M, Uchida S, Michinobu T. A novel polymeric chemosensor: dual colorimetric detection of metal ions through click synthesis. Macromol Rapid Commun 2011; 32:1804-8. [PMID: 21905148 DOI: 10.1002/marc.201100397] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 07/11/2011] [Indexed: 11/09/2022]
Abstract
A highly colored polystyrene derivative bearing side chain chromophores composed of dialkylanilino donor and cyano-based acceptor groups, prepared by atom-economic click postfunctionalization, displays the dual colorimetric detection behavior of several metal ions based on the specific interactions with different nitrogen atoms. Hard to borderline metal ions, such as Fe(3+) , Fe(2+) , and Sn(2+) , are always recognized by the dialkylanilino nitrogen atom, resulting in a decrease in the charge-transfer (CT) band intensity of the donor-acceptor chromophores. On the other hand, the recognition site of a soft metal ion of Ag(+) is the cyano nitrogen atom due to the readily formed multivalent coordination, which produces a bathochromic shift of the CT band.
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Affiliation(s)
- Yongrong Li
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Nagakubo J, Ashizawa M, Kawamoto T, Tanioka A, Mori T. Stabilization of organic field-effect transistors by tert-butyl groups in dibenzotetrathiafulvalene derivatives. Phys Chem Chem Phys 2011; 13:14370-7. [PMID: 21677975 DOI: 10.1039/c1cp21507h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For a material for organic thin-film transistors, not only high mobility but also low threshold voltage and long-term stability are important requirements. In order to realize these properties, materials with relatively large oxidation potentials, namely weak donors, have been designed as p-channel organic semiconductors. Here we propose a different strategy; transistor properties of dibenzotetrathiafulvalene (DBTTF) are significantly improved by the introduction of tert-butyl groups. Although this chemical modification does not much change the ionization potential, small threshold voltage and stability over several months are attained together with the improved mobility, probably due to some kind of passivation effect of the bulky tert-butyl groups. In contrast, the systematic fluorine substitution rapidly diminishes the transistor performance. There are two kinds of herringbone structures with much different dihedral angles of about 50° and 130°, and the tert-butyl compound falls into the former category.
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Affiliation(s)
- Junki Nagakubo
- Department of Chemistry and Materials Science, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
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Nakasone H, Binh P, Yamazaki R, Tanaka Y, Sakamoto K, Ashizawa M, Sato M, Terasako K, Kimura SI, Kikuchi M, Kako S, Okuda S, Oshima K, Tanihara A, Nishida J, Abe Y, Kanda Y. Association Between Serum High-Molecular-Weight Adiponectin Level and the Severity of Chronic Graft-Versus-Host Disease in Allogeneic Stem Cell Transplantation Recipients. Biol Blood Marrow Transplant 2011. [DOI: 10.1016/j.bbmt.2010.12.554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yuan Y, Michinobu T, Ashizawa M, Mori T. Microwave-assisted TCNE/TCNQ addition to poly(thienyleneethynylene) derivative for construction of donor-acceptor chromophores. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24515] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [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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Kanda Y, Sakamoto K, Ashizawa M, Sato M, Terasako K, Kikuchi M, Kimura SI, Okuda S, Kako S, Oshima K. Risks and benefits of ovarian shielding in female patients undergoing TBI: a decision analysis. Bone Marrow Transplant 2010; 46:1145-7. [DOI: 10.1038/bmt.2010.240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ashizawa M, Ishidzu KI, Watanabe M, Tanahashi T, Shirahata T, Kawamoto T, Mori T, Misaki Y. Novel Bis-fused π-Electron Donor Composed of Tetrathiafulvalene and Tetraselenafulvalene. CHEM LETT 2010. [DOI: 10.1246/cl.2010.1093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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