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( Takato Maeda ),( Hirotake Sakuraba ),( Hiroto Hiraga ),( Shukuko Yoshida ),( Yoichi Kakuta ),( Hidezumi Kikuchi ),( Shogo Kawaguchi ),( Keisuke Hasui ),( Tetsuya Tatsuta ),( Daisuke Chinda ),( Tatsu 대한장연구학회 2022 Intestinal Research Vol.20 No.1
Background/Aims: Thiopurines are key drugs for inflammatory bowel disease (IBD), including ulcerative colitis (UC) and Crohn’s disease (CD). Recently, NUDT15 polymorphism (R139C, c.415C>T) has been shown to be associated with thiopurine-induced adverse events in Asian populations. In patients with the C/T genotype, low-dose thiopurine treatment is recommended, but its long-term efficacy and tolerability remain unclear. This study aimed to uncover the long-term efficacy and appropriate dosage of thiopurine for IBD patients with the C/T genotype. Methods: A total of 210 patients with IBD (103 UC and 107 CD) determined to have NUDT15 R139C variants were enrolled. Clinical data were retrospectively reviewed from medical records. Results: Of 46 patients (21.9%) with the C/T genotype, 30 patients (65.2%) were treated with thiopurines. Three of whom (10.0%) discontinued thiopurine treatment due to adverse events and 27 of whom continued. The median maintenance dosage of 6-mercaptopurine was 0.25 mg/kg/day (range, 0.19-0.36 mg/kg/day), and 6-thioguanine nucleotides level was 230 (104-298) pmol/8×10<sup>8</sup> red blood cells. Cumulative thiopurine continuation rates for 120 months for patients with the C/C and C/T genotypes were not significantly different (P=0.895). Cumulative non-relapse rates in the patients with UC treated with thiopurine monotherapy and surgery-free rates in CD patients treated with combination therapy (thiopurines and anti-tumor necrosis factor-α agents) for maintenance remission were not significantly different at 60 months (C/C vs. C/T, P=0.339 and P=0.422, respectively). Conclusions: Low-dose thiopurine treatment is an effective and acceptable treatment for patients with C/T genotype. (Intest Res 2022;20:90-100)
Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis
Ryo Ageba,Yoichi Kadota,Takafumi Maeda,Norihito Takiguchi,Takeshi Morita,Mutsuso Ishikawa,Peter Bornmann,Tobias Hemsel 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
The hydrothermal method enables the production of high-quality piezoelectric materials. In this study, we propose to irradiate the reaction solutions with ultrasonic power during the hydrothermal method to obtain a shorter reaction time and a smooth film surface. A high-pressure reaction container for the ultrasonic transducer was newly developed, and the ultrasonically-assisted hydrothermal method was examined by using this container. The effect of ultrasonic assist on the synthesis of lead-zirconate-titanate (PZT) thin films and (K,Na)NbO3 powders was verified. Thicker PZT film, thickness around 10 µm, could be obtained in one process, and (K,Na)NbO3 powder was synthesized in half the previous reaction time.
Katsuda, Satoru,Maeda, Keiichi,Ohira, Yutaka,Yatsu, Yoichi,Mori, Koji,Aoki, Wako,Morihana, Kumiko,Raymond, John C.,Ghavamian, Parviz,Lee, Jae-Joon,Shimoda, Jiro,Yamazaki, Ryo American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.819 No.2
<P>We present high-resolution long-slit spectroscopy of a Balmer-dominated shock in the northeastern limb of the Cygnus Loop with the Subaru high dispersion spectrograph. By setting the slit angle along the shock normal, we investigate variations of the flux and profile of the H alpha line from preshock to postshock regions with a spatial resolution of similar to 4 x 10(15) cm. The Ha line profile can be represented by a narrow (28.9 +/- 0.7 km s(-1)) Gaussian in a diffuse region ahead of the shock, i.e., a photoionization precursor, and narrow (33.1 +/- 0.2 km s(-1)) plus broad (130-230 km s(-1)) Gaussians at the shock itself. We find that the width of the narrow component abruptly increases up to 33.1 +/- 0.2 km s(-1), or 38.8 +/- 0.4 km s(-1) if we eliminate projected emission originating from the photoionization precursor, in an unresolved thin layer (less than or similar to 4 x 10(15) cm at a distance of 540 pc) at the shock. We show that the sudden broadening can be best explained by heating via damping of Alfven waves in a thin cosmic-ray (CR) precursor, although other possibilities are not fully ruled out. The thickness of the CR precursor in the Cygnus Loop (a soft gamma-ray emitter) is an order of magnitude thinner than that in Tycho's Knot g (a hard gamma-ray emitter), which may be caused by the different energy distribution of accelerated particles between the two sources. In this context, systematic studies might reveal a positive correlation between the thickness of the CR precursor and the hardness of the CR energy distribution.</P>
林炳鎰,前田敬之,小野陽一 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2
The effects of mineral composition and pore structure on the reducibility of sintered iron ores were studied using sintered iron ores having six different basicities, it was found that : 1) For small cracked sinters, the distribution of small cracked diameters and the presence ratio of micropores were almost constant irrespective of basicity change. hence, in the microscopic observation and measurement of the distriution of small cracked diameters for specimens having various basicites, it was found that there were changes of the mineral structure with negligible change of small cracked structure. 2) The reduction rate of small cracked sinters corresponded mineral structures well, and sintered ores of E,C and D, which were mainly composed of hematite and calcium ferrite, had better reducibility than those of F,A and B, which were mainly composed of magnetite and slag. Especially, the sintered ore of F, which had the highest FeO content as 11.7% and the lowest basicity as 1.12, showed extremely poor reducibility. 3) The reduction rate of lumpy sinters could not be determined by the mineral structure alone, but was clearly affected by porosity, pore structure and, especially, the presence ratio of macropores which supplied reducing gases for the mineral structures.
소결광의 CO 가스 환원과 H2 가스 환원과의 환원속도의 비교
임병익,전전경지,소야양일 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
Seven kinds of sinters having different basicities were reduced at 900℃ with either 90%CO10%CO₂ gas mixture or Hz gas. The data were analyzed by the one-irrtertace unreacted-core model and the reduction rate changes by with CO and H: were compared. The results are summarized as follows;(1) The average reduction rates in H₂, were calculated from reduction curves between the reduction degree of 40% and 60% were 5∼7 times than that in CO except for one kind of sinter. (2) The ratio of the chemical reaction rate constant (Kc) between CO reduction and Hz reduction showed little difference except for one kind of sinter. The rate constants of Hz reduction were 2∼3 times higher than those of CO reduction. (3) the ratio of the effective diffusivity in the product layer (De) between CO reduction and H₂ Reduction was different among various sinters. The values of the effective diffusivity of H₂ reduction were 4∼14 times higher than Chose of CO reduction.