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Cathodic Reaction of Perovskite Oxide Electrodes on a Proton Conducting Electrolyte
Suzuki, Kota,Hashimoto, Shin-ichi,Yashiro, Keiji,Amezawa, Koji,Kawada, Tatsuya The Electrochemical Society 2013 ECS transactions Vol.57 No.1
<P>Cathodic reaction of protonic ceramic fuel cells (PCFCs) using SrZrO<SUB>3</SUB> based proton conducting electrolyte with perovskite oxide cathode is studied. A dense La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>CoO<SUB>3</SUB> (LSC) film is fabricated on 10mol% Y-doped SrZrO<SUB>3</SUB> (SZY) electrolyte using pulsed laser deposition (PLD) method as a cathode. Cathodic performance of the dense LSC electrode is evaluated using AC impedance measurement and Secondary Ion Mass Spectroscopy (SIMS) analysis. Impedance spectra suggest that LSC dense film play a role as proton blocking electrode. SIMS analysis reveals that proton concentration in LSC dense film is higher than bulk of LSC, and there is no concentration gradient in LSC and SZY. Therefore, it is suggested that proton surface exchange rate of LSC is very low.</P>
Suzuki, Minoru,Amano, Morikazu,Choi, Jihyung,Park, Heon Joo,Williams, Brent W.,Ono, Koji,Song, Chang W. BioOne (Radiation Research Society) 2006 Radiation research Vol.165 No.5
<P>It has been reported that beta-lapachone (beta-lap), a bioreductive anti-cancer drug, synergistically interacts with ionizing radiation and that the sensitivity of cells to beta-lap is closely related to the activity of NAD(P)H:quinone oxidoreductase 1 (NQO1). Here we report the results of our studies of mechanisms underlying the synergistic interaction of beta-lap and radiation in killing cancer cells using the DU-145 human prostate cancer cell line. The clonogenic cell death caused by the combination of radiation and beta-lap was synergistic when beta-lap was administered 0-10 h after irradiation but not when it was given before irradiation. The expression and activity of NQO1 increased significantly and remained elevated for longer than 12 h after 4 Gy irradiation, suggesting that the long-lasting elevation of NQO1 sensitized the cells to beta-lap. Studies with split-dose irradiation demonstrated that beta-lap given immediately after irradiation effectively inhibited sublethal radiation damage (SLD) repair. Taken together, these results lead us to conclude that the synergistic interaction between beta-lap and radiation in killing cells is the result of two distinct mechanisms: First, radiation sensitizes cells to beta-lap by up-regulating NQO1, and second, beta-lap sensitizes cells to radiation by inhibiting SLD repair. The combination of beta-lap and radiotherapy is potentially promising modality for the treatment of cancer in humans.</P>
Bending Strength of Textured Alumina Prepared by Slip Casting in a Strong Magnetic Field
Suzuki Tohru S.,Uchikoshi Tetsuo,Morita Koji,Hirage Keijiro,Sakka Yoshio 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The mechanical properties of ceramics materials can be tailored by designing their microstructures. We have reported that development of texture can be controlled by slip casting in a strong magnetic field followed by heating even for diamagnetic ceramics such as alumina. A strong magnetic field of 12T was applied to the suspension indcuding alumina powder to rotate each particle during slip casting. The sintering was conducted at the desired temperature in air without a magnetic field. C-axis of alumina was parallel to the magnetic field. Bending strength of textured alumina depended on the direction of oriented microstructure.