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Cho, H.S.,Gokon, N.,Kodama, T.,Kang, Y.H.,Lee, H.J. Elsevier 2015 International journal of hydrogen energy Vol.40 No.1
<P><B>Abstract</B></P> <P>The joint international project between Niigata University (Japan) and the Korea Institute of Energy Research, KIER (Korea) on “Solar Demonstration of Water-Splitting Reactor using Ceramic Foam Device” has two goals. (1) Develop a solar reactor using reactive cerium oxide foam devices for high-temperature two-step thermochemical water-splitting cycle. (2) Test its performance under various operational methods using a 40 kW<SUB>th</SUB> solar furnace driven by natural solar energy. The reactive CeO<SUB>2</SUB>/MPSZ (MgO – partially stabilized zirconia) foam device for two-step water-splitting was developed and prepared by Niigata University/Japan; it involves coating an inert zirconia foam matrix with reactive CeO<SUB>2</SUB>. In this paper, highly reactive CeO<SUB>2</SUB> particles were used the redox material in CeO<SUB>2</SUB>/MPSZ foam devices to investigate the use of solar energy for hydrogen production. The solar-driven thermochemical two-step water-splitting cycle was demonstrated using the 40 kW<SUB>th</SUB> KIER solar furnace in Korea combined with the CeO<SUB>2</SUB>/MPSZ foam device. At the center of the foam device, temperatures were 1500 °C–1600 °C during the thermal reduction step and 600 °C-1100 °C during the subsequent water decomposition step. Hydrogen was successfully produced from the CeO<SUB>2</SUB>/MPSZ foam device, and profiles for hydrogen production and CeO<SUB>2</SUB> conversion indicated definitely improved operations compared to earlier studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Three different operational methods were tested using a ceria-coated foam device. </LI> <LI> A ceria-coated foam device was fabricated by spin coating method. </LI> <LI> A H<SUB>2</SUB> production process under real solar condition tested using a KIER solar furnace. </LI> <LI> In the cycles, a CCD-camera was used to monitor the discoloration of the foam device. </LI> <LI> Each of the three operational methods tested showed significant differences. </LI> </UL> </P>
X-ray Photoelectron and UV Photoyield Spectroscopic on Sr$_x$Bi$_y$Ta$_2$O$_9$ Films
M. Takahashi,H. Funakubo,K. Kodama,M. Noda,M. Okuyama,T. Watanabe 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Photoemissions from ferroelectric SrxBiyTa2O9 (SBT) thin lms deposited by metalorganic chemical vapor deposition (MOCVD), pulsed lased deposition (PLD) and metalorganic decomposition (MOD) have been analyzed by X-ray photoelectron spectroscopy (XPS) and UV-photoyield spectroscopy (UV-PYS) in order to study their valence bands, Bi 4f core levels and Fermi levels. The XPS has shown band tails above the valence bands in all of the SBT lms, which are considered to induce UV-PYS signal from the Fermi levels. The XPS have also indicated that there exist less stable (Bi2O2)2+ layers in the inside of the PLD-SBT than in the MOCVD- and the MOD-SBT lms. P-E hystereses have been measured at various voltage sweeping rates, and have suggested that leakage currents through the capacitors are increased as the band tails in the valence bands are enlarged.
Kirby, K A,Singh, K,Michailidis, E,Marchand, B,Kodama, E N,Ashida, N,Mitsuya, H,Parniak, M A,Sarafianos, S G R. Wegmann 2011 Cellular and molecular biology Vol.57 No.1
<P>4'—Ethynyl—2—fluoro—2'—deoxyadenosine (EFdA) is the most potent inhibitor of HIV reverse transcriptase (RT). We have recently named EFdA a Translocation Defective RT Inhibitor (TDRTI) because after its incorporation in the nucleic acid it blocks DNA polymerization, primarily by preventing translocation of RT on the template/primer that has EFdA at the 3'—primer end (T/PEFdA). The sugar ring conformation of EFdA may also influence RT inhibition by a) affecting the binding of EFdA triphosphate (EFdATP) at the RT active site and/or b) by preventing proper positioning of the 3'—OH of EFdA in T/PEFdA that is required for efficient DNA synthesis. Specifically, the North (C2'—exo/C3'—endo), but not the South (C2'—endo/C3'—exo) nucleotide sugar ring conformation is required for efficient binding at the primer—binding and polymerase active sites of RT. In this study we use nuclear magnetic resonance (NMR) spectroscopy experiments to determine the sugar ring conformation of EFdA. We find that unlike adenosine nucleosides unsubstituted at the 4'—position, the sugar ring of EFdA is primarily in the North conformation. This difference in sugar ring puckering likely contributes to the more efficient incorporation of EFdATP by RT than dATP. In addition, it suggests that the 3'—OH of EFdA in T/PEFdA is not likely to prevent incorporation of additional nucleotides and thus it does not contribute to the mechanism of RT inhibition. This study provides the first insights into how structural attributes of EFdA affect its antiviral potency through interactions with its RT target.</P>
Teenage pregnancy complicated by primary invasive ovarian cancer: association for oncologic outcome
Erin A. Blake,Madushka Y. De Zoysa,Elise B. Morocco,Samantha B. Kaiser,Michiko Kodama,Brendan H. Grubbs,Koji Matsuo 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.5
Objective: To examine survival of teenage women with pregnancies complicated by primary ovarian cancer. Methods: This is a secondary analysis of a previously organized systematic literature review of primary ovarian cancer diagnosed during pregnancy. Cases eligible for analysis were patients whose age at cancer diagnosis and survival outcome were known (n=201). Pregnancy and oncologic outcome were then examined based on patient age. Results: These were comprised of 95 (47.3%) epithelial ovarian cancers (EOCs), 82 (40.8%) malignant germ cell tumors (MGCTs), and 24 (11.9%) sex-cord stromal tumors (SCSTs). Teenage pregnancy was seen in 21 (10%) cases, and was highest among the SCST group compared to the other cancer types (EOC, 1.1%; MGCT, 14.6%; and SCST, 29.2%, p<0.001). Live birth rates, neonatal weight, full term delivery rates, and Cesarean section rates were similar between the teenage group and the non-teenage group (all, p>0.05); however, teenage pregnancy was significantly associated with an increased risk of serious maternal/neonatal adverse events (50% vs. 22.7%, p=0.013). On univariable analysis, teenage pregnancy was significantly associated with decreased ovarian cancer-specific survival (5-year rate: age ≥30, 79.6%; age 20–29, 87.2%; and age <20, 41.6%; p<0.001). On multivariable analysis controlling for calendar year, cancer type, cancer stage, and gestational age at ovarian cancer diagnosis, teenage pregnancy remained an independent prognostic factor for decreased ovarian cancer-specific survival compared to women aged ≥30 (adjusted-hazard ratio=4.71; 95% confidence interval=1.17–18.9; p=0.029). Conclusion: Teenage women with pregnancies complicated by primary ovarian cancer may be at increased risk of poor survival from ovarian cancer.