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Bilateral Transverse (Bowdler) Fibular Spurs with Hypophosphatasia in an Adolescent Girl
Ismail Uras,Nurdan Uras,Ahmet Karadag,Osman Yuksel Yavuz,Hakan Atalar 대한영상의학회 2005 Korean Journal of Radiology Vol.6 No.1
Hypophosphatasia is a clinically heterogeneous inheritable disorder characterized by defective bone mineralization and the deficiency of serum and tissue liver/bone/kidney alkaline phosphatase activities. Due to the mineralization defect of the bones, various skeletal findings can be radiologically observed in hypophosphatasia. Bowing and Bowdler spurs of long bones are the characteristic findings. The Bowdler spurs reported on in the previous pertinent literature were observed in the perinatal aged patients and these lesions have rarely involved adolescents. We herein report on a 14-year-old girl with fibular Bowdler spurs.
Ura Pancharoen,Prakorn Ramakul,Natchanun Leepipatpiboon 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.4
The enhancement of liquid membrane performance in this study, by consecutive extraction using a synergistic extractant, is the first to demonstrate that the synergistic extractant, normally employed in the solvent extraction process, can also be extended to extraction applications via a liquid membrane. The study focuses on increasing the flux of metal ions using a consecutive extraction reaction which occurs inside the liquid membrane phase. Uranium ions in trisodium phosphate solution, a by-product of monazite processing, are the specie of interest in this experiment. The feed solution is trisodium phosphate containing uranium ions, whereas the stripping solution is nitric acid. The extractant is Aliquat336 mixed with TBP in kerosene. The results demonstrate that when Aliquat336 is mixed with TBP, the flux of uranium ions is synergistically increased because of a consecutive extracting reaction in the liquid membrane phase. The highest flux is 3600 mg m2 s1 with 0.06 M TBP and 0.6 M Aliquat336. Synergistic extraction is also obtained because the flux is much higher than that obtained using a single extractant.
Performance of hollow fiber supported liquid membrane on the extraction of mercury(II) ions
Ura Pancharoen,Ekapong Uedee,Prakorn Ramakul,Anchaleeporn W. Lothongkum 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The extraction and recovery or stripping of mercury ions from chloride media using microporous hydrophobic hollow fiber supported liquid membranes (HFSLM) has been studied. Tri-n-octylamine (TOA) dissolved in kerosene was used as an extractant. Sodium hydroxide was used as a stripping solution. The transport system was studied as a function of several variables: the concentration of hydrochloric acid in the feed solution, the concentration of TOA in the liquid membrane, the concentration of sodium hydroxide in the stripping solution, the concentration of mercury ions in the feed solution and the flow rates of both feed and stripping solutions. The results indicated that the maximum percentages of the extraction and recovery of mercury ions of 100% and 97% were achieved at the concentration of hydrochloric acid in the feed solution of 0.1 mol/l, the concentration of TOA at 3% v/v, the concentration of sodium hydroxide at 0.5 mol/l and the flow rates of the feed and stripping solutions of 100 ml/min. However, the concentration of mercury ions from 1-100 ppm in the feed solution had no effect on the percentages of extraction and recovery of mercury ions. Thus, these results have identified that the hollow fiber supported liquid membrane process has high efficiency on both the extraction and recovery of mercury (II) ions. Moreover, the mass transfer coefficients of the aqueous phase (ki) and membrane or organic phase (km) were calculated. The mass transfer coefficients of the aqueous phase and organic phase are 0.42 and 1.67 cm/s, respectively. The mass transfer coefficient of the organic phase is higher than that of the aqueous phase. Therefore, the mass transfer controlling step is the diffusion of the mercury ions through the film layer between the feed solution and the liquid membrane.
Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Ura, Yasuyuki,Tsujita, Hiroshi,Mitsudo, Take-Aki,Kondo, Teruyuki Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(η6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetrahydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(η4-cod)(η6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(η6-cot)(η2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(η6-cot)(η2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(η6-cot)(η2-dmfm)2 catalyst in the presence of primary alcohols.
Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Yasuyuki Ura,Hiroshi Tsujita,Take-aki Mitsudo,Teruyuki Kondo* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(h6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetra-hydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(h4-cod)(h6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(h6-cot)(h2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(h6-cot)(h2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(h6-cot)(h2-dmfm)2 catalyst in the presence of primary alcohols.
A surface shape measurement method using a self-shape sensor “Flexible Sensor Tube”
Daisuke Ura,Koichi Osuka 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This study describes surface shape measurements using a Flexible Sensor Tube(FST). The FST is also a sensor for measuring self-shape. The sensor consists of many short links, and each link connects by a rotational joint connects each link with a potentiometer as an angular position sensor. Consequently, we can geometrically measure the sensor’s shape. We proposed a method for measuring the surface shape of an object by stroking it with this FST. A waterproof FST was developed, and the proposed technique was evaluated, focusing on its use in dredge construction. Therefore, we demonstrated that the newly developed FST measures surface shapes.