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采用敏感度编码单次激发快速自旋回波(SSTSE)反转恢复序列的反转时间鉴别肝脏血管瘤和囊肿

国际医学放射学杂志 2010年第6期 586-587页

作者： Y.Katada m.yasumoto C.Ishii H.Tanaka K.Nakamoto I.Ohashi 龙淼淼 Department of Radiology Dokkyo Medical UniversityKoshigaya Hospital2-1-50Minami-KoshigayaKoshigaya-shiSaitama343-8555Japan

目的研究敏感度编码(SENSE)单次激发快速自旋回波反转恢复序列的反转恢复时间辅助常规多回波T2WI鉴别肝血管瘤和肝囊肿的价值。材料与方法本研究共包括59例病人的134个病变(77个海绵状血管瘤,57个肝囊

关键词：反转恢复并行成像未增强mR 肝血管瘤肝囊肿

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Degradation rates and products of fluticasone propionate in alkaline solutions

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Journal of Pharmaceutical Analysis 2017年第5期7卷 297-302页

作者： Tadakazu Tokumura Naoko Yoshida Kanami mori-yasumoto Osamu Shirota Takuro Kurita Laboratory of Pharmaceutics Kagawa School of Pharmaceutical Sciences Tokushima Bunri University Department of Pharmaceutical Sciences School of Pharmacy International University of Health and Welfare Laboratory of Pharmacognosy and Natural Products Chemistry Kagawa School of Pharmaceutical Sciences Tokushima Bunri University

The apparent degradation rate constant of fluticasone propionate(FLT) in 0.1 m NaOH:methanol=1:1 at 37 °C was previously reported to be 0.169 ± 0.003 h^(-1), and four degradation products(products 1–4) were observed in the solution. The aims of the present study were to assess the degradation rates of FLT in other alkaline solutions and clarify the chemical structures of the four degradation products in order to obtain basic data for designing an enema for inflammatory bowel disease. The apparent degradation rate constants in 0.05 m NaOH and 0.1 m NaOH:CH_3CN=1:1 were 0.472 ± 0.013 h^(-1) and 0.154 ± 0.000 h^(-1)(n=3), respectively. The chemical structures of products 1–4 in 0.1 m NaOH:methanol=1:1 were revealed by nuclear magnetic resonance(NmR)and mass spectrometry data. The chemical structure of products 2 was that the 17-position of the thioester moiety of FLT was substituted by a carboxylic acid. The degradation product in 0.1 m NaOH:CH_3CN=1:1 was found to be product 2 based on ~1H NmR data. The degradation product in 0.05 m NaOH was considered to be product 2 based on the retention time of HPLC. These results are useful for detecting the degradation products of FLT by enzymes of the intestinal bacterial flora in the large intestine after dosing FLT as an enema.

关键词： Fluticasone propionate Degradation rate Degradation products Chemical structure Alkaline solution

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Analysis of Field Emission Properties of Carbon Nanocoils for Imaging materials

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仪器仪表学报 2004年第S3期 72-75+115页

作者： yasumoto Konishi,Hiroyoshi Tanaka,Yoshikazu Nakayama,Osamu Suekane,Toshikazu Nosaka Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599-8531 Japan Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599-8531 Japan Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599-8531 Japan Innovation Plaza Osaka Japan Science and Technology Agency Izumi Osaka 594-1144 Japan Handai Frontier Research Center Graduate School of Engineering Osaka University Osaka 565-0871 Japan Handai Frontier Research Center Graduate School of Engineering Osaka University Osaka 565-0871 Japan Innovation Plaza Osaka Japan Science and Technology Agency Izumi Osaka 594-1144 Japan Technology Research Institute of Osaka Prefecture Izumi Osaka 594-1157 Japan

Carbon nanotubes and nanocoils are expected as the charging materials and electron gun for the imaging devices. It is synthesized for carbon nanocoils with different diameters by the catalytic thermal decomposition of acetylene using iron-indium-tin-oxide catalysts. It is found that the turn-on voltage is decreased by decreasing the average diameter of the grown carbon nanocoils. The turn on voltage of as low as 30 V at the electrodes' gap of 130 μm has been achieved when the coil diameter is decreased to 60 nm. The calculation for the concentration of the electric field on the coil surface has been performed using a finite element method. It is obtained that the strength of electric field around the top ring of a coil is increased with the decrease of the tubular diameter of the coil and has a similar value for that at the tip of a carbon nanotube, suggesting that the efficiency of the field emission from nanocoils would be higher than that from nanotubes. These results can explain the good stability of field emission from carbon nanocoils.

关键词： Carbon nanocoil Field emission Carbon nanotube Finite element method

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