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Protective Effects of N-acetylcystenine and Selenium against Doxorubicin Toxicity in Rats
Yeo-sung Yoon,Sun-don Kim,Min-hye Lee,Heung-shik S.Lee,In-se Lee,Je-kyung Sung,Eun-sung Park 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2
Effects of N-acetylcysteine and Selenium against Doxorubicin Toxicity in RatsEun-sung Park, Sun-don Kim1, Min-hye Lee, Heung-shik S. Lee, In-se Lee, Je-kyung Sung and Yeo-sung Yoon*
Enhanced Flavonoid Production in Streptomyces venezuelae via Metabolic Engineering
( Sung Ryeol Park ),( Mi Sun Ahn ),( Ah Reum Han ),( Je Won Park ),( Yeo Joon Yoon ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.11
Metabolic engineering of plant-specific phenylpropanoid biosynthesis has attracted an increasing amount of attention recently, owing to the vast potential of flavonoids as nutraceuticals and pharmaceuticals. Recently, we have developed a recombinant Streptomyces venezuelae as a heterologous host for the production of flavonoids. In this study, we successfully improved flavonoid production by expressing two sets of genes predicted to be involved in malonate assimilation. The introduction of matB and matC encoding for malonyl-CoA synthetase and the putative dicarboxylate carrier protein, respectively, from Streptomyces coelicolor into the recombinant S. venezuelae strains expressing flavanone and flavone biosynthetic genes resulted in enhanced production of both flavonoids.
Yoon, Yeo-Taek,Lee, Sang-Shin,Lee, Byoung-Su Elsevier 2012 Photonics and nanostructures Vol.10 No.1
<P><B>Highlights</B></P><P>► We propose a highly efficient visible wavelength filter enabling a homogeneous integration with an image sensor, which can be fabricated by employing an advanced standard 90-nm CMOS process. ► We design and implement the proposed device incorporating a metallic subwavelength grating embedded in a CMOS image sensor. ► We analyze the characteristics of the visible wavelength filter by referring to the practical metal-grating structures.</P> <P><B>Abstract</B></P><P>A highly efficient visible wavelength filter enabling a homogeneous integration with an image sensor was proposed and manufactured by employing a standard 90-nm CMOS process. A one dimensional subwavelength Al grating overlaid with an oxide film was built on top of an image sensor to serve as a low-pass wavelength filter; a microlens was then formed atop the filter to achieve beam focusing. The structural parameters for the filter were: a grating pitch of 300nm, a grating height of 170nm, and a 150-nm thick oxide overlay. The overall transmission was observed to reach up to 80% in the visible band with a decent roll-off near ∼700nm. Finally, the discrepancy between the observed and calculated result was accounted for by appropriately modeling the implemented metallic grating structure, accompanying an undercut sidewall.</P>
Structure and electrochemical applications of boron-doped graphitized carbon nanofibers
Yeo, Jae-Seong,Jang, Sang-Min,Miyawaki, Jin,An, Bai,Mochida, Isao,Rhee, Choong Kyun,Yoon, Seong-Ho IOP Pub 2012 Nanotechnology Vol.23 No.31
<P>Boron-doped graphitized carbon nanofibers (CNFs) were prepared by optimizing CNFs preparation, surface treatment, graphitization and boron-added graphitization. The interlayer spacing (d<SUB>002</SUB>) of the boron-doped graphitized CNFs reached 3.356 Å, similar to that of single-crystal graphite. Special platelet CNFs (PCNFs), for which d<SUB>002</SUB> is less than 3.400 Å, were selected for further heat treatment. The first heat treatment of PCNFs at 2800 °C yielded a d<SUB>002</SUB> between 3.357 and 3.365 Å. Successive nitric acid treatment and a second heat treatment with boric acid reduced d<SUB>002</SUB> to 3.356 Å. The resulting boron-doped PCNFs exhibited a high discharge capacity of 338 mAh g<SUP>−1</SUP> between 0 and 0.5 V versus Li/Li<SUP>+</SUP> and 368 mAh g<SUP>−1</SUP> between 0 and 1.5 V versus Li/Li<SUP>+</SUP>. The first-cycle Coulombic efficiency was also enhanced to 71–80%. Such capacity is comparable to that of natural graphite under the same charge/discharge conditions. The boron-doped PCNFs also exhibited improved rate performance with twice the capacity of boron-doped natural graphite at a discharge rate of 5 C. </P>