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Inaba M, Murase R, Takeshita T, Yano K, Kosaka S, Takahashi N, Isomura N, Oh-ishi K, Yoshimune W, Tsuchiya K, Nobukawa T, Kodama K. Synthesis of a Mesoporous SnO 2 Catalyst Support and the Effect of Its Pore Size on the Performance of Polymer Electrolyte Fuel Cells. ACS Appl Mater Interfaces 2024; 16:10295-10306. [PMID: 38379515 PMCID: PMC10910439 DOI: 10.1021/acsami.4c01794] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 02/09/2024] [Accepted: 02/12/2024] [Indexed: 02/22/2024]
Abstract
The aim of this study was to clarify the effectiveness and challenges of applying mesoporous tin oxide (SnO2)-based supports for Pt catalysts in the cathodes of polymer electrolyte fuel cells (PEFCs) to simultaneously achieve high performance and high durability. Recently, the focus of PEFC application in automobiles has shifted to heavy-duty vehicles (HDVs), which require high durability, high energy-conversion efficiency, and high power density. It has been reported that employing mesoporous carbon supports improves the initial performance by mitigating catalyst poisoning caused by sulfonic acid groups of the ionomer as well as by reducing the oxygen transport resistance through the Pt/ionomer interface. However, carbon materials in the cathode can degrade oxidatively during long-term operation, and more stable materials are desired. In this study, we synthesized connected mesoporous Sb-doped tin oxides (CMSbTOs) with controlled mesopore sizes in the range of 4-11 nm and tested their performance and durability as cathode catalyst supports. The CMSbTO supports exhibited higher fuel cell performance at a pore size of 7.3 nm than the solid-core SnO2-based, solid-core carbon, and mesoporous carbon supports under dry conditions, which can be attributed to the mitigation of the formation of the Pt/ionomer interface and the better proton conductivity within the mesopores even at the low-humidity conditions. In addition, the CMSbTO supports exhibited high durability under oxidative conditions. These results demonstrate the promising applicability of mesoporous tin oxide supports in PEFCs for HDVs. The remaining challenges, including the requirements for improving performance under wet conditions and stability under reductive conditions, are also discussed.
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Affiliation(s)
- Masanori Inaba
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Ryuichi Murase
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | | | - Kazuhisa Yano
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Satoru Kosaka
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Naoko Takahashi
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Noritake Isomura
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Keiichiro Oh-ishi
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | - Wataru Yoshimune
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
| | | | | | - Kensaku Kodama
- Toyota
Central R&D Laboratories., Inc., Nagakute, Aichi 480-1192, Japan
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Isomura N, Oh-Ishi K, Takahashi N, Kosaka S. A practical method for determining film thickness using X-ray absorption spectroscopy in total electron yield mode. J Synchrotron Radiat 2021; 28:1820-1824. [PMID: 34738935 DOI: 10.1107/s1600577521009401] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Thin films formed on surfaces have a large impact on the properties of materials and devices. In this study, a method is proposed using X-ray absorption spectroscopy to derive the film thickness of a thin film formed on a substrate using the spectral separation and logarithmic equation, which is a modified version of the formula used in electron spectroscopy. In the equation, the decay length in X-ray absorption spectroscopy is longer than in electron spectroscopy due to a cascade of inelastic scattering of electrons generated in a solid. The modification factor, representing a multiple of the decay length, was experimentally determined using oxidized Si and Cu with films of thickness 19 nm and 39 nm, respectively. The validity of the proposed method was verified, and the results indicated that the method can be used in the analysis of various materials with thin films.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Keiichiro Oh-Ishi
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Naoko Takahashi
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Satoru Kosaka
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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3
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Isomura N, Kimoto Y. Local atomic structure analysis around Mg atom doped in GaN by X-ray absorption spectroscopy and spectrum simulations. J Synchrotron Radiat 2021; 28:1114-1118. [PMID: 34212874 DOI: 10.1107/s1600577521004008] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/14/2021] [Indexed: 06/13/2023]
Abstract
The identification of the incorporated site of magnesium (Mg) and hydrogen (H) required for p-type formation in gallium nitride (GaN) power devices has been demonstrated by X-ray absorption spectroscopy (XAS). In this study, the fluorescence line of Mg with 3 × 1019 atoms cm-3 was successfully separated from that of Ga using a superconducting tunnel junction array detector with high sensitivity and high energy resolution, and consequently the Mg K-edge XAS spectra of such dilute samples were obtained. The site of Mg atoms incorporated into the GaN lattice was identified as the Ga substitutional site by comparing the experimental XAS spectrum with the simulated spectra calculated by density functional theory. In addition, the presence or absence of H around Mg can be determined through distinctive characteristics expected from the spectrum simulations.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Yasuji Kimoto
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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Horikoshi Y, Yaguchi C, Matsumoto M, Isomura N, Uchida T, Itoh H. Clinicopathological characteristics of deciduitis in the placenta after miscarriage and preterm delivery. Placenta 2021. [DOI: 10.1016/j.placenta.2020.09.047] [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: 10/22/2022]
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5
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Suzuki TM, Ishizaki T, Kosaka S, Takahashi N, Isomura N, Seki J, Matsuoka Y, Oh-Ishi K, Oshima A, Kitazumi K, Sekizawa K, Morikawa T. Electrochemical CO 2 reduction over nanoparticles derived from an oxidized Cu-Ni intermetallic alloy. Chem Commun (Camb) 2020; 56:15008-15011. [PMID: 33185202 DOI: 10.1039/d0cc06130a] [Citation(s) in RCA: 4] [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: 12/29/2022]
Abstract
Oxide-derived Cu-Ni (3-32 at%-Ni) alloy nanoparticles with a size of 10 nm enhance selectivity for ethylene and ethanol formation over oxide-derived Cu nanoparticles by electrochemical CO2 reduction. X-ray absorption spectroscopy measurements suggest that Ni (generally recognized as an element to avoid) is in a mixed phase of oxidized and metallic states.
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Affiliation(s)
- Tomiko M Suzuki
- Toyota Central R&D Labs. Inc., 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan.
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Isomura N, Kikuta D, Takahashi N, Kosaka S, Kataoka K. Local atomic structure analysis of GaN surfaces via X-ray absorption spectroscopy by detecting Auger electrons with low energies. J Synchrotron Radiat 2019; 26:1951-1955. [PMID: 31721740 DOI: 10.1107/s1600577519012827] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
GaN is a promising material for power semiconductor devices used in next-generation vehicles. Its electrical properties such as carrier mobility and threshold voltage are affected by the interface between the oxide and the semiconductor, and identifying the interface states is important to improve these properties. A surface-sensitive measurement of Ga K-edge extended X-ray absorption fine structure (EXAFS) by detecting Ga LMM Auger electrons that originate from Ga K-shell absorption is proposed for GaN. LMM Auger electrons with low energies were detected and the EXAFS oscillation was confirmed, providing information on the Ga atoms at the surface. Investigation of thermally oxidized GaN with an oxide film of defined thickness showed that the analysis depth was less than 10 nm, which is consistent with the inelastic mean free path of 2.3 nm estimated for LMM Auger electrons in GaN.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Daigo Kikuta
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Naoko Takahashi
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Satoru Kosaka
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Keita Kataoka
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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Isomura N, Takahashi N, Kosaka S, Kawaura H. Thickness of carbon coatings on silicon materials determined by hard X-ray photoelectron spectroscopy at multiple photon energies. J Synchrotron Radiat 2019; 26:1936-1939. [PMID: 31721737 DOI: 10.1107/s1600577519010981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Hard X-ray photoelectron spectroscopy at multiple photon energies is used to investigate the surface structure of carbon coatings on silicon materials destined for use as negative electrodes in lithium-ion batteries. The photoelectron intensity from the carbon coatings decreases with an increase in the kinetic energy of the photoelectron. By fitting the photoelectron intensity versus energy to numerically derived curves, the thickness and coverage of the carbon coatings can be obtained. The results are in agreement with the values suggested by the cross-sectional secondary-electron microscopy images of the carbon coatings, although the thickness should be corrected by accounting for the rectangular parallelepiped structure of the silicon material.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Naoko Takahashi
- Toyota Central R&D Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Satoru Kosaka
- Toyota Central R&D Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Hiroyuki Kawaura
- Toyota Central R&D Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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8
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Isomura N, Kutsuki K, Kataoka K, Watanabe Y, Kimoto Y. Distinguishing nitrogen-containing sites in SiO 2/4H-SiC(0001) after nitric oxide annealing by X-ray absorption spectroscopy. J Synchrotron Radiat 2019; 26:462-466. [PMID: 30855256 DOI: 10.1107/s1600577519001504] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 01/26/2019] [Indexed: 06/09/2023]
Abstract
The atomic structure of nitrogen at the SiO2/4H-SiC(0001) interface has been investigated using X-ray absorption spectroscopy (XAS) in two nitric oxide annealed samples, one of which was oxidized in dry O2 (NO-POA) prior to the experiment. The peak shapes and energies of the observed and simulated spectra are in agreement and indicate that the N-containing sites could be the substitutional C site at the interface for the NO-annealed sample and the interstitial site in the interior of SiC for the NO-POA-annealed sample. XAS analysis distinguished between the N-containing sites at the SiO2/SiC interface.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Katsuhiro Kutsuki
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Keita Kataoka
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Yukihiko Watanabe
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Yasuji Kimoto
- Toyota Central R&D Laboratories Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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Isomura N, Murai T, Nomoto T, Kimoto Y. Surface EXAFS via differential electron yield. J Synchrotron Radiat 2017; 24:445-448. [PMID: 28244438 DOI: 10.1107/s1600577516019676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
Surface-sensitive analysis via extended X-ray absorption fine-structure (EXAFS) spectroscopy is demonstrated using a thickness-defined SiO2 (12.4 nm)/Si sample. The proposed method exploits the differential electron yield (DEY) method wherein Auger electrons escaping from a sample surface are detected by an electron analyzer. The DEY method removes local intensity changes in the EXAFS spectra caused by photoelectrons crossing the Auger peak during X-ray energy sweeps, enabling EXAFS analysis through Fourier transformation of wide-energy-range spectral oscillations. The Si K-edge DEY X-ray absorption near-edge structure (XANES) spectrum appears to comprise high amounts of SiO2 and low Si content, suggesting an analysis depth, as expressed using the inelastic mean free path of electrons in general electron spectroscopy, of approximately 4.2 nm. The first nearest neighbor (Si-O) distance derived from the Fourier transform of the Si K-edge DEY-EXAFS oscillation is 1.63 Å. This value is within the reported values of bulk SiO2, showing that DEY can be used to detect a surface layer of 12.4 nm thickness with an analysis depth of approximately 4.2 nm and enable `surface EXAFS' analysis using Fourier transformation.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Labs Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Takaaki Murai
- Aichi Synchrotron Radiation Center, 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Toyokazu Nomoto
- Aichi Synchrotron Radiation Center, 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Yasuji Kimoto
- Toyota Central R&D Labs Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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10
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Beniya A, Ikuta Y, Isomura N, Hirata H, Watanabe Y. Synergistic Promotion of NO-CO Reaction Cycle by Gold and Nickel Elucidated using a Well-Defined Model Bimetallic Catalyst Surface. ACS Catal 2017. [DOI: 10.1021/acscatal.6b02714] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Atsushi Beniya
- Toyota Central R&D Labs, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Yasuhiro Ikuta
- Toyota Central R&D Labs, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Noritake Isomura
- Toyota Central R&D Labs, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Hirohito Hirata
- Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka 410-1193, Japan
| | - Yoshihide Watanabe
- Toyota Central R&D Labs, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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11
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Isomura N, Kamada M, Nonaka T, Nakamura E, Takano T, Sugiyama H, Kimoto Y. A new EXAFS method for the local structure analysis of low-Z elements. J Synchrotron Radiat 2016; 23:281-285. [PMID: 26698075 DOI: 10.1107/s1600577515021165] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/07/2015] [Indexed: 06/05/2023]
Abstract
A unique analytical method is proposed for local structure analysis via extended X-ray absorption fine structure (EXAFS) spectroscopy. The measurement of electron energy distribution curves at various excitation photon energies using an electron energy analyzer is applied to determine a specific elemental Auger spectrum. To demonstrate the method, the N K-edge EXAFS spectra for a silicon nitride film were obtained via simultaneous measurement of the N KLL Auger and background spectra using dual-energy windows. The background spectrum was then used to remove the photoelectrons and secondary electron mixing in the energy distribution curves. The spectrum obtained following this subtraction procedure represents the `true' N K-edge EXAFS spectrum without the other absorptions that are observed in total electron yield N K-edge EXAFS spectra. The first nearest-neighbor distance (N-Si) derived from the extracted N K-edge EXAFS oscillation was in good agreement with the value derived from Si K-edge analysis. This result confirmed that the present method, referred to as differential electron yield (DEY)-EXAFS, is valid for deriving local surface structure information for low-Z elements.
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Affiliation(s)
- Noritake Isomura
- Toyota Central R&D Laboratories, 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Masao Kamada
- Aichi Synchrotron Radiation Center (AichiSR), 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Takamasa Nonaka
- Toyota Central R&D Laboratories, 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
| | - Eiken Nakamura
- Aichi Synchrotron Radiation Center (AichiSR), 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Takumi Takano
- Aichi Synchrotron Radiation Center (AichiSR), 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Harue Sugiyama
- Aichi Synchrotron Radiation Center (AichiSR), 250-3 Minamiyamaguchi-cho, Seto, Aichi 489-0965, Japan
| | - Yasuji Kimoto
- Toyota Central R&D Laboratories, 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
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Yakushiji T, Ono M, Igawa W, Takehiko K, Ebara S, Okabe T, Yamashita K, Yamamoto M, Hoshimoto K, Saito S, Amemiya K, Isomura N, Araki H, Ochiai M. Anti-inflammatory effect of colchicine in Japanese patients with stable coronary artery disease: A pilot study. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.781] [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: 12/01/2022]
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13
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Isomura N, Kataoka K, Horibuchi K, Dohmae K, Oji H, Cui YT, Son JY, Kitazumi K, Takahashi N, Kimoto Y. Thickness and coverage determination of multilayer with an island-like overlayer by hard X-ray photoelectron spectroscopy at multiple photon energies. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- N. Isomura
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - K. Kataoka
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - K. Horibuchi
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - K. Dohmae
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - H. Oji
- Japan Synchrotron Radiation Research Institute (JASRI); 1-1-1 Kouto Sayo Hyogo 679-5198 Japan
| | - Y.-T. Cui
- Japan Synchrotron Radiation Research Institute (JASRI); 1-1-1 Kouto Sayo Hyogo 679-5198 Japan
- Synchrotron Radiation Research Organization; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - J.-Y. Son
- Japan Synchrotron Radiation Research Institute (JASRI); 1-1-1 Kouto Sayo Hyogo 679-5198 Japan
| | - K. Kitazumi
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - N. Takahashi
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
| | - Y. Kimoto
- Toyota Central R&D Labs., Inc.; 41-1 Yokomichi Nagakute Aichi 480-1192 Japan
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Takanaka T, Kumano T, Shibata S, Ohashi S, Nakagawa M, Isomura N, Noto K, Ueda S, Kurata Y. Breath-Hold Volumetric Modulated Arc Stereotactic Body Radiation Therapy for Early-Stage Lung Cancer Guided by Real-Time Fluoroscopy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1811] [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: 10/24/2022]
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15
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Isomura N, Yamauchi C, Takeuchi Y, Takemura A. Does dopamine block the spawning of the acroporid coral Acropora tenuis? Sci Rep 2014; 3:2649. [PMID: 24026104 PMCID: PMC3770960 DOI: 10.1038/srep02649] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 08/28/2013] [Indexed: 11/09/2022] Open
Abstract
Most corals undergo spawning after a particular moon phase, but how moon-related spawning is endogenously regulated in corals remains unknown. The objective of the present study was to evaluate whether dopamine (DA) affects spawning in Acropora tenuis. When pieces of four A. tenuis colonies were reared under a natural photoperiod and water temperature, spawning was observed after the predicted moon phase. After exposure to water containing DA at 0.1 μM, pieces of the same colonies only released 5 to 10 bundles. Co-treatment with DA and pimozide (D1 and D2 receptors antagonist), but not domperidone (D2 receptor antagonist), induced mass release of bundles from the colonies. A cross-experiment revealed high fertilization rates between the control colonies (95%) and between the control and DA-treated colonies (90%), suggesting that gametes developed normally in coral tissue. Therefore, DA appears to have an inhibitory effect on the spawning of A. tenuis.
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Affiliation(s)
- N Isomura
- Department of Bioresources Engineering, Okinawa National College of Technology, 905 Henoko, Nago-City, Okinawa 905-2192, Japan
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Hasegawa T, Shahed SMF, Sainoo Y, Beniya A, Isomura N, Watanabe Y, Komeda T. Epitaxial growth of CeO2(111) film on Ru(0001): Scanning tunneling microscopy (STM) and x-ray photoemission spectroscopy (XPS) study. J Chem Phys 2014; 140:044711. [DOI: 10.1063/1.4849595] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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17
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Beniya A, Isomura N, Hirata H, Watanabe Y. Morphology and chemical states of size-selected Ptnclusters on an aluminium oxide film on NiAl(110). Phys Chem Chem Phys 2014; 16:26485-92. [DOI: 10.1039/c4cp01767f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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]
Abstract
Size-selected Ptnclusters on the Al2O3surface form two-dimensional planar structures atn≤ 18 and three-dimensional two-layer structures start to appear atn≥ 19. They are composed of neutral and cationic Pt atoms.
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Yokoi T, Ueda S, Takemura A, Noto K, Isomura N, Togawa K, Takanaka T, Kumano T, Mizuno E. Development of a New Simulation Method of Dose-Distribution Changes for an IMRT Plan by Rotational Setup Error. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Watanabe Y, Wu X, Hirata H, Isomura N. Size-dependent catalytic activity and geometries of size-selected Pt clusters on TiO2(110) surfaces. Catal Sci Technol 2011. [DOI: 10.1039/c1cy00204j] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Isomura N, Wu X, Watanabe Y. Atomic-resolution imaging of size-selected platinum clusters on TiO2(110) surfaces. J Chem Phys 2009; 131:164707. [DOI: 10.1063/1.3251786] [Citation(s) in RCA: 42] [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: 11/14/2022] Open
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21
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Inagaki J, Nagatoshi Y, Hatano M, Isomura N, Sakiyama M, Okamura J. Low-dose MTX for the treatment of acute and chronic graft-versus-host disease in children. Bone Marrow Transplant 2007; 41:571-7. [DOI: 10.1038/sj.bmt.1705922] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [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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22
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Hanmura T, Ichihashi M, Watanabe Y, Isomura N, Kondow T. Reactions of Nitrogen Monoxide on Cobalt Cluster Ions: Reaction Enhancement by Introduction of Hydrogen. J Phys Chem A 2006; 111:422-8. [PMID: 17228890 DOI: 10.1021/jp063273a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 11/30/2022]
Abstract
Absolute cross sections for NO chemisorption, NO decomposition, and cluster dissociation in the collision of a nitrogen monoxide molecule, NO, with cluster ions Con+ and ConH+ (n=2-5) were measured as a function of the cluster size, n, in a beam-gas geometry in a tandem mass spectrometer. Size dependency of the cross sections and the change of the cross sections by introduction of H to Con+ (effect of H-introduction) are explained by a statistical model based on the RRK theory, with the aid of the energetics obtained by a DFT calculation. It was found that the reactions are governed by the energetics rather than dynamics. For instance, Co3+ does not react appreciably with NO because the reactions are endothermic, while Co3H+ does because the reaction becomes exothermic by the H-introduction.
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Affiliation(s)
- Tetsu Hanmura
- East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
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23
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Hirano R, Momiyama Y, Miyazaki K, Isomura N, Katayama N, Hisada T, Sawada S, Yonemura A, Higashi K, Shibuya T, Nakamura H, Ohsuzu F. Additional effect of Chlamydia pneumoniae infection to genetic factors in the development of coronary artery disease. Atherosclerosis 2000. [DOI: 10.1016/s0021-9150(00)80588-2] [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: 10/18/2022]
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24
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Shinjoh H, Isomura N, Sobukawa H, Sugiura M. Effect of Alkaline Addition on Hydrocarbon Oxidation Activities of Palladium Three-way Catalyst. Catalysis and Automotive Pollution Control IV, Proceedings of the Fourth International Symposium (CAPoC4) 1998. [DOI: 10.1016/s0167-2991(98)80866-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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25
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Shimoda S, Tabei A, Isomura N, Kasai K, Kikuchi T. [Mechanism of action of thyroid antagonists: with special reference to its relationship with concentration of inorganic iodine in the blood]. Horumon To Rinsho 1973; 21:509-12. [PMID: 4125853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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26
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Homma M, Isomura N, Tu AT. Hemorrhage, myonecrosis and vascular lesion in experimental snake envenomation, with special reference to Thailand snake venoms. Jpn J Med Sci Biol 1972; 25:206-10. [PMID: 4539444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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27
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Shimoda S, Tabei A, Kuniyoshi M, Sugita Y, Isomura N. [Iodine therapy for chronic thyroiditis]. Saishin Igaku 1970; 25:1103-7. [PMID: 5421878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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28
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Milyakawa M, Iljima S, Kishimoto H, Kobayashi R, Tajima M, Isomura N, Asano M, Hong SC. Rearing Germ-Free Guinea Pigs*. Pathol Int 1958. [DOI: 10.1111/j.1440-1827.1958.tb00262.x] [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: 11/29/2022]
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