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Polycrystalline NiO Thin Films Applicable to Nano-Storage Media
Inrok Hwang,박배호,Dongchul Kim,Inkyung Yoo,Jinho Lee,Jinsik Choi,Jinsoo Kim,Sahwan Hong,Sangho Jeon,Sanghoon Kim,Sunae Seo,강성웅,Yong-Il Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
We have investigated local electrical properties of NiO thin films applicable to nano-storage devices. Polycrystalline NiO thin films were deposited on Pt/Ti/SiO2/Si substrates by dc magnetron reactive sputtering methods. X-ray diffraction (XRD) data have shown that polycrystalline NiO films without second phases were grown on the substrates. We also observed root mean square roughness of 1.9 nm in the 15μm × 15 μm area of a NiO film by using atomic force microscopy (AFM) mode. Using conducting atomic force microscopy (C-AFM) mode, we measured the change in local current distribution and found that the grown NiO films exhibited excellent resistance switching behavior at the nanoscale and good retention behavior of the written nano-sized domains. Moreover, we investigated the relation between pulse height and bit size. It was possible to write 8×8 bits in 4×4 μm² area and to store digital information corresponding to several Gbit/inch². Therefore, we successfully showed the feasibility of NiO films as media for nano-storage devices. We have investigated local electrical properties of NiO thin films applicable to nano-storage devices. Polycrystalline NiO thin films were deposited on Pt/Ti/SiO2/Si substrates by dc magnetron reactive sputtering methods. X-ray diffraction (XRD) data have shown that polycrystalline NiO films without second phases were grown on the substrates. We also observed root mean square roughness of 1.9 nm in the 15μm × 15 μm area of a NiO film by using atomic force microscopy (AFM) mode. Using conducting atomic force microscopy (C-AFM) mode, we measured the change in local current distribution and found that the grown NiO films exhibited excellent resistance switching behavior at the nanoscale and good retention behavior of the written nano-sized domains. Moreover, we investigated the relation between pulse height and bit size. It was possible to write 8×8 bits in 4×4 μm² area and to store digital information corresponding to several Gbit/inch². Therefore, we successfully showed the feasibility of NiO films as media for nano-storage devices.
Kim, Si Hyun,Bae, Il Kwon,Park, Dongchul,Lee, Kyungmin,Kim, Na Young,Song, Sae Am,Kim, Hye Ran,Jeon, Ga Won,Urm, Sang-Hwa,Shin, Jeong Hwan Hindawi Publishing Corporation 2016 BioMed research international Vol.2016 No.-
<P><I>Introduction</I>.<I> Streptococcus pneumoniae</I> is an important pathogen with high morbidity and mortality rates. The aim of this study was to evaluate the distribution of common serotypes and antimicrobial susceptibility of<I> S. pneumoniae</I> in Korea.<I> Methods</I>. A total of 378 pneumococcal isolates were collected from 2008 through 2014. We analyzed the serotype and antimicrobial susceptibility for both invasive and noninvasive isolates.<I> Results</I>. Over the 7 years, 3 (13.5%), 35 (10.8%), 19A (9.0%), 19F (6.6%), 6A (6.1%), and 34 (5.6%) were common serotypes/serogroups. The vaccine coverage rates of PCV7, PCV10, PCV13, and PPSV23 were 21.4%, 23.3%, 51.9%, and 62.4% in all periods. The proportions of serotypes 19A and 19F decreased and nonvaccine serotypes increased between 2008 and 2010 and 2011 and 2014. Of 378<I> S. pneumoniae</I> isolates, 131 (34.7%) were multidrug resistant (MDR) and serotypes 19A and 19F were predominant. The resistance rate to levofloxacin was significantly increased (7.2%).<I> Conclusion</I>. We found changes of pneumococcal serotype and antimicrobial susceptibility during the 7 years after introduction of the first pneumococcal vaccine. It is important to continuously monitor pneumococcal serotypes and their susceptibilities.</P>
Growth and Osteoblastic Differentiation of Mesenchymal Stem Cells on Silk Scaffolds
Cho, Hee-Yeon,Baik, Young-Ae,Jeon, Suyeon,Kwak, Yoon-Hae,Kweon, Hae Yong,Jo, You Young,Lee, Kwang Gill,Park, Young Hwan,Kang, Dongchul Korean Society of Sericultural Science 2013 International Journal of Industrial Entomology Vol.27 No.2
In this study, we compared the efficiency of osteoblast differentiation media (ODM) containing three distinct reagent combinations in osteoblastic differentiation of human bone marrow-derived mesenchymal stem cells (hBMSCs) in monolayer culture. In addition, we analyzed growth and differentiation of hBMSCs on silk scaffolds and examined the bone-forming activity of a nanofibrous silk scaffold in a tibia diaphysis defect model of a rat hind limb with intramedullary nailing. Although all three ODM increased alkaline phosphatase activity to a comparable extent, the ODM containing bone morphogenetic protein-2 (BMP-2) was found to be significantly less effective in promoting mineral deposition than the others. Growth of hBMSCs on sponge-form silk scaffolds was faster than on nanofibrous ones, while osteoblastic differentiation was apparent in the cells grown on either type of scaffold. By contrast, bone formation was observed only at the edge of the nanofibrous scaffold implanted in the tibia diaphysis defect, suggesting that use of the silk scaffold alone is not sufficient for the reconstitution of the long bone defect. Since silk scaffolds can support cell growth and differentiation in vitro, loading MSCs on scaffolds might be necessary to improve the bone-forming activity of the scaffold in the long bone defect model.
Yasmin, Sabina,Ahmed, Mohammad Shamsuddin,Park, Dongchul,Jeon, Seungwon The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.9
<P>In this report, nitrogen-doped reduced graphene oxide supported cobalt in mixed-oxide (NrGO-Co3O4) has been prepared by simple hydrothermalmethod and applied as an electrocatalyst for the selective determination of dopamine (DA) over in various biointerfering molecules. Various instrumental analyses have confirmed that the NrGO-Co3O4 nanocomposite has prepared successfully. The detection of DA at as prepared NrGO-Co3O4 has verified through various electrochemical techniques in a 0.1 M phosphate buffer solution (PBS) at pH 7.4. No significant interference has observed in presence of several electroactive interferences; especially, 1000 magnitude higher concentration of AA has shown insignificant interference in the DA detection on NrGO-Co3O4. Overall analytical performance demonstrates a good DA sensing at NrGO-Co3O4 with better sensitivity (369 mu A mM(-1) cm(-2)), long detection range (0.3-800.8 mu M) and lower detection limit (0.029 mu M). The catalytic rate constant and diffusion coefficient for DA detection has been calculated as 6.6 x 10(4) M-1 s(-1) and 5.05 x 10(-6) cm(2) s(-1), respectively. This proposed electrocatalyst has finally shown very satisfactory result on real urine sample analysis. (C) 2016 The Electrochemical Society. All rights reserved.</P>
Growth and Osteoblastic Differentiation of Mesenchymal Stem Cells on Silk Scaffolds
( Hee Yeon Cho ),( Young Ae Baik ),( Suyeon Jeon ),( Yoon Hae Kwak ),( Hae Yong Kweon ),( You Young Jo ),( Kwang Gill Lee ),( Young Hwan Park ),( Dongchul Kang ) 한국잠사학회 2013 International Journal of Industrial Entomology Vol.27 No.2
In this study, we compared the efficiency of osteoblast differentiation media (ODM) containing three distinct reagent combinations in osteoblastic differentiation of human bone marrowderived mesenchymal stem cells (hBMSCs) in monolayer culture. In addition, we analyzed growth and differentiation of hBMSCs on silk scaffolds and examined the bone-forming activity of a nanofibrous silk scaffold in a tibia diaphysis defect model of a rat hind limb with intramedullary nailing. Although all three ODM increased alkaline phosphatase activity to a comparable extent, the ODM containing bone morphogenetic protein-2 (BMP-2) was found to be significantly less effective in promoting mineral deposition than the others. Growth of hBMSCs on sponge-form silk scaffolds was faster than on nanofibrous ones, while osteoblastic differentiation was apparent in the cells grown on either type of scaffold. By contrast, bone formation was observed only at the edge of the nanofibrous scaffold implanted in the tibia diaphysis defect, suggesting that use of the silk scaffold alone is not sufficient for the reconstitution of the long bone defect. Since silk scaffolds can support cell growth and differentiation in vitro, loading MSCs on scaffolds might be necessary to improve the bone-forming activity of the scaffold in the long bone defect model.