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Chung, Wan-Ho,Hwang, Yeon-Taek,Lee, Seung-Hyun,Kim, Hak-Sung IOP 2016 Nanotechnology Vol.27 No.20
<P>In this work, combined silver/copper nanoparticles were fabricated by the electrical explosion of a metal wire. In this method, a high electrical current passes through the metal wire with a high voltage. Consequently, the metal wire evaporates and metal nanoparticles are formed. The diameters of the silver and copper nanoparticles were controlled by changing the voltage conditions. The fabricated silver and copper nano-inks were printed on a flexible polyimide (PI) substrate and sintered at room temperature via a flash light process, using a xenon lamp and varying the light energy. The microstructures of the sintered silver and copper films were observed using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). To investigate the crystal phases of the flash-light-sintered silver and copper films, x-ray diffraction (XRD) was performed. The absorption wavelengths of the silver and copper nano-inks were measured using ultraviolet–visible spectroscopy (UV–vis). Furthermore, the resistivity of the sintered silver and copper films was measured using the four-point probe method and an alpha step. As a result, the fabricated Cu/Ag film shows a high electrical conductivity (4.06 <I>μ</I>Ωcm), which is comparable to the resistivity of bulk copper (1.68 <I>μ</I>Ωcm). In addition, the fabricated Cu/Ag nanoparticle film shows superior oxidation stability compared to the Cu nanoparticle film.</P>
Bilateral Bipartite Carpal Scaphoid
Sang-Bum Kim(김상범),Woo-Sik Kim(김우식),Whan-Yong Chung(정환용),Taek-Soo Jeon(전택수),In-Tak Bae(배인탁) 대한정형외과학회 2005 대한정형외과학회지 Vol.40 No.5
이분 주상골은 드문 기형이며 아직도 그 선천성 혹은 외상성의 논란의 여지는 있으나 대부분의 보고가 선천성의 가능성을 시사 하고 있다. 현재 까지 이분 주상골에 대한 국내 증례보고는 없었으며 이에 저자들은 38세 남자의 이분 주상골의 증례를 경험하였기에 문헌 고찰과 함께 보고하고자 한다. Bipartite scaphoid is a rare anomaly and it has been questioned as whether it is of congenital origin or traumatic. However, many authors have reported that congenital origin is more probable. There was no case report in Korea about bipartite scaphoid, but this article reports a case of a 38-year-old male with bilateral bipartite scaphoid.
Chung, Hyewon,Yu, Kyung-Sang,Hong, Kyung Taek,Choi, Jung Yoon,Hong, Che Ry,Kang, Hyoung Jin,Park, Kyung Duk,Shin, Hee Young,Lee, SeungHwan Raven Press 2017 Therapeutic drug monitoring Vol.39 No.3
<P>Busulfan is a cytotoxic agent used in preconditioning for hematopoietic stem cell transplantation. Therapeutic drug monitoring of busulfan is necessary owing to its narrow therapeutic range. Patients undergoing preconditioning are susceptible to infection and might require coadministration of antibiotics. We present a case study of a 3-year-old girl with precursor T-cell acute lymphoblastic leukemia who received intravenous busulfan before hematopoietic stem cell transplantation. Metronidazole was coadministered before the third dose of busulfan because of Clostridium difficile infection. The daily pharmacokinetic analysis revealed that the clearance reduced to 57% of that before the coadministration. Although the underlying mechanism is unclear, a significant pharmacokinetic interaction was observed between busulfan and metronidazole, underscoring the importance of therapeutic drug monitoring.</P>
Electrochemical Behavior of Mordant Red 19 and its Complexes with Light Lanthanides
Sang Kwon Lee,Taek Dong Chung,Song-Ju Lee,Ki-Hyung Chjo,Young Gu Ha,Ki-Won Cha,Hasuck Kim Korean Chemical Society 1993 Bulletin of the Korean Chemical Society Vol.14 No.5
Mordant Red 19(MR19) is reduced at mercury electrode at -0.67 V vs. Ag/AgCl with two electrons per molecule in pH 9.2 buffer by differential pulse polarography and linear sweep voltammetry. The peak potential is dependent on the pH of solution. The exhaustive electrolysis, however, gives 4 electrons per molecule because of the disproportionation of the unstable hydrazo intermediate. The electrochemical reduction of lanthanide-MR19 complexes is observed at more cathodic potential than that of free ligand. The difference in peak potentials between complex and free ligand varies from 75 mV for $La^{3+}$ to 165 mV for $Tb^{3+}$ and increases with increasing the atomic number of lanthanide. The electrochemical reduction of lanthanide complexes with MR19 is due to the reduction of ligand itself, and it can be potentially useful as an indirect method for the determination of lanthanides. The shape of i-E curves and the scan rate dependence indicates the presence of adsorption and the adsorption was confirmed by potential double-step chronocoulometry and the effect of standing time. Also the surface excess of the adsorbed species and diffusion coefficients are determined. The composition of the complex is determined to be 1 : 2 by spectrophotometric and electrochemical methods.