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Nagaraja, B.M.,Jung, H.,Yang, D.R.,Jung, K.D. Elsevier Science Publishers 2014 CATALYSIS TODAY - Vol.232 No.-
PtSn/θ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823K, an atmospheric pressure and a GHSV of 18,000mL(g<SUB>cat</SUB>h)<SUP>-1</SUP>. The compositions listed in order of n-C<SUB>4</SUB><SUP>=</SUP> yields at 823K were as follows: K<SUB>0.95</SUB>(PtSn)<SUB>1.5</SUB>>(PtSn)<SUB>1.5</SUB>>K<SUB>0.4</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>0.7</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>1.2</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>1.45</SUB>(PtSn)<SUB>1.5</SUB>>K<SUB>0.9</SUB>(Pt)<SUB>1.5</SUB>. The K<SUB>0.9</SUB>(Pt)<SUB>1.5</SUB> and K<SUB>0.95</SUB>(Sn)<SUB>1.5</SUB> catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)<SUB>1.5</SUB> (without K) catalyst showed the highest n-butane conversion, while K<SUB>0.95</SUB>(PtSn)<SUB>1.5</SUB> did the highest n-C<SUB>4</SUB><SUP>=</SUP> yield. The small amount of potassium on bimetallic PtSn/θ-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst improved n-C<SUB>4</SUB><SUP>=</SUP> selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C<SUB>4</SUB><SUP>=</SUP> yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45wt.%) doped (PtSn)<SUB>1.5</SUB> catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C<SUB>4</SUB><SUP>=</SUP> selectivity of the (PtSn)<SUB>1.5</SUB> catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C<SUB>4</SUB><SUP>=</SUP> selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C<SUB>4</SUB><SUP>=</SUP> yield among the other alkali metals for n-butane dehydrogenation.
Jung, Y. K.,Udalski, A.,Sumi, T.,Han, C.,Gould, A.,Skowron, J.,Kozłowski, S.,Poleski, R.,Wyrzykowski, Ł.,Szymań,ski, M. K.,Pietrzyń,ski, G.,Soszyń,ski, I.,Ulaczyk, K.,Pietrukowicz, P.,M IOP Publishing 2015 The Astrophysical journal Vol.798 No.2
<P>We present an analysis of the gravitational microlensing event OGLE-2013-BLG-0102. The light curve of the event is characterized by a strong short-term anomaly superposed on a smoothly varying lensing curve with a moderate magnification A(max) similar to 1.5. It is found that the event was produced by a binary lens with a mass ratio between the components of q = 0.13 and the anomaly was caused by the passage of the source trajectory over a caustic located away from the barycenter of the binary. Based on the analysis of the effects on the light curve due to the finite size of the source and the parallactic motion of the Earth, we determine the physical parameters of the lens system. The measured masses of the lens components are M-1 = 0.096 +/- 0.013 M-circle dot and M-2 = 0.012 +/- 0.002 M-circle dot, which correspond to near the hydrogen-burning and deuterium-burning mass limits, respectively. The distance to the lens is 3.04 +/- 0.31 kpc and the projected separation between the lens components is 0.80 +/- 0.08 AU.</P>
OGLE-2014-BLG-0257L: A MICROLENSING BROWN DWARF ORBITING A LOW-MASS M DWARF
Han, C.,Jung, Y. K.,Udalski, A.,Gould, A.,Bozza, V.,Szymań,ski, M. K.,Soszyń,ski, I.,Poleski, R.,Kozłowski, S.,Pietrukowicz, P.,Skowron, J.,Ulaczyk, K.,Wyrzykowski, Ł. American Astronomical Society 2016 The Astrophysical Journal Vol.822 No.2
<P>In this paper, we report the discovery of a binary composed of a brown dwarf (BD) and a low-mass M dwarf from observation of the microlensing event OGLE-2014-BLG-0257. The resolution of the very brief caustic crossing combined with the detection of subtle continuous deviation in the lensing light curve induced by the Earth's orbital motion enable us to precisely measure both the Einstein radius theta(E) and the lens parallax pi(E), which are the two quantities needed to unambiguously determine the mass and distance to the lens. It is found that the companion is a substellar BD with a mass of 0.036 +/- 0.005 M-circle dot (37.7 +/- 5.2 M-J) and it is orbiting an M dwarf with a mass of 0.19 +/- 0.02 M-circle dot. The binary is located at a distance of 1.25 +/- 0.13 kpc toward the Galactic bulge and the projected separation between the binary components is 0.61 +/- 0.07 au. The separation scaled by the mass of the host is 3.2 au/M-circle dot. Based on the assumption that separations scale with masses, the discovered BD is located in the BD desert. With the growing sample of BDs in various environments, microlensing will provide a powerful probe of BDs in the Galaxy.</P>
Song, B.M.,Kang, H.M.,Lee, E.K.,Jung, S.C.,Kim, M.C.,Lee, Y.N.,Kang, S.M.,Lee, Y.J. Butterworths ; Elsevier Science Ltd 2016 Vaccine Vol.34 No.5
Highly pathogenic avian influenza (HPAI) H5 viruses derived from A/Goose/Guangdong/1/96 have been continuously circulating globally, severely affecting the public health and poultry industries. The matrix 2 protein ectodomain (M2e) is considered a promising candidate for a universal cross-protective influenza vaccine that provides more effective control over HPAI H5 viruses harboring variant hemagglutinin (HA)-antigens. Here, we evaluated the protective efficacy of a tandem repeat construct of heterologous M2e presented on virus-like particles (M2e5x VLPs) either alone or as a supplement against HPAI H5 viruses in a chicken model. Chickens immunized with M2e5x VLPs alone induced M2e-specific antibodies but were not protected against HPAI H5. The homo- and cross-protective efficacy of M2e5x VLP-supplemented vaccination of chickens was also examined. Importantly, supplementation with M2e5x VLPs induced significantly higher levels of antibodies specific for M2e and different viruses as well as provided improved protection against homologous and heterologous HPAI H5 viruses. Considering the limited efficacy of inactivated vaccines, supplement vaccination with M2e5x VLPs may be an effective measure for preventing outbreaks of HPAI viruses that have the ability to constantly change their antigenic properties in poultry.
Kang, H.J.,Noh, T.H.,Na, Y.M.,Yoo, K.H.,Jung, O.S. Elsevier Sequoia [etc.] 2009 Inorganica chimica acta Vol.362 No.6
The reaction of (COD)PdCl<SUB>2</SUB> (COD=1,5-cyclooctadiene) with (3-Py)<SUB>2</SUB>SiR<SUB>1</SUB>R<SUB>2</SUB> (3-Py=3-pyridyl; R<SUB>1</SUB>=Ph, R<SUB>2</SUB>=Ph (m-pdps); R<SUB>1</SUB>=Ph, R<SUB>2</SUB>=Me (m-pmps)) in acetone affords single crystals consisting of cyclodimers, [PdCl<SUB>2</SUB>((3-Py)<SUB>2</SUB>SiR<SUB>1</SUB>R<SUB>2</SUB>)]<SUB>2</SUB>, whereas the same reaction in a mixture of dichloromethane and ethanol yields amorphous spheres consisting of cyclotrimers, [PdCl<SUB>2</SUB>((3-Py)<SUB>2</SUB>SiR<SUB>1</SUB>R<SUB>2</SUB>)]<SUB>3</SUB>. In a boiling chloroform solution, the cyclodimers are completely converted to cyclotrimers. These cyclotrimers, in the 10-60<SUP>o</SUP>C range, are partly returned to cyclodimers. By contrast, the reaction of (COD)PdCl<SUB>2</SUB> with (3-Py)<SUB>2</SUB>SiR<SUB>1</SUB>R<SUB>2</SUB> (R<SUB>1</SUB>=Bu, R<SUB>2</SUB>=Me (m-pbms); R<SUB>1</SUB>=dodecyl, R<SUB>2</SUB>=Me (m-pddms)) yields amorphous spheres consisting of cyclotrimers irrespective of solvents. Both [PdCl<SUB>2</SUB>(m-pbms)]<SUB>3</SUB> and [PdCl<SUB>2</SUB>(m-pddms)]<SUB>3</SUB> are initially cyclotrimers in chloroform, but they exist as a mixture of cyclodimers and cyclotrimers in solution in the 10-60<SUP>o</SUP>C range. The metallacycles tend to form cyclodimers in the order m-pdps>m-pmps>m-pbms>m-pddms. The equilibrium between cyclodimers and the cyclotrimers is sensitive to solvent, temperature, and concentration as well as molecular structure.
Jung, B. K.,Khan, A. R.,Hong, S. J.,Park, G. S.,Park, Y. J.,Kim, H. J.,Jeon, H. J.,Khan, M. A.,Waqas, M.,Lee, I. J. UNIV. OF MILAN DEPARTMENT OF FOOD SCIENCE AND MICR 2017 ANNALS OF MICROBIOLOGY Vol.67 No.9
<P>Plant growth-promoting rhizobacteria (PGPR) affect plant growth through various mechanisms, such as indole-3-acetic acid (IAA) production, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, and biofilm formation. The aim of the study reported here was to isolate and characterize rhizobacteria that produce quorum-sensing signal molecules and other PGPR-related molecules. A biofilm-forming bacterium, GS2, was isolated from the rhizosphere of a sesame plant and subsequently found to produce two quorum-sensing signal molecules that were identified as N-hexanoyl-L-homoserine lactone (m/z 200) and N-octanoyl-L-homoserine lactone (m/z 228) by liquid chromatography-tandem mass spectrometry analysis. The strain was also found to produce IAA (17.2 mu g mL(-1)), gibberellins (113.7 mu g mL(-1)), and ACC deaminase (9.7 mu M alpha-ketobutyrate mg(-1) protein h(-1)). The strain was identified as Serratia glossinae based on a comparison of 16S rRNA gene sequences. Inoculation of the strain promoted growth of a gibberellin-deficient rice dwarf mutant (Waito-C). Different growth attributes, including shoot and root elongation, chlorophyll content, and plant weight could be attributed to the PGPR characteristics of strain GS2. These results suggest that S. glossinae strain GS2 can serve as a microbial agent that improves plant growth.</P>
Jung, J.,Kim, Y. J.,Lee, K. Y.,-Cayetano, M. G.,Batmunkh, T.,Koo, J.-H.,Kim, J. Copernicus GmbH 2010 Atmospheric Chemistry and Physics Vol.10 No.12
<P>Abstract. As a part of the IGAC (International Global Atmospheric Chemistry) Mega-cities program, aerosol physical and optical properties were continuously measured from March 2007 to March 2008 at an urban site (37.57° N, 126.94° E) in Seoul, Korea. Spectral optical properties of long-range transported Asian dust and pollution aerosols have been investigated based on the year long measurement data. Optically measured black carbon/thermally measured elemental carbon (BC/EC) ratio showed clear monthly variation with high values in summer and low values in winter mainly due to the enhancement of light attenuation by the internal mixing of EC. Novel approach has been suggested to retrieve the spectral light absorption coefficient (babs) from Aethalometer raw data by using BC/EC ratio. Mass absorption efficiency, σabs (=babs/EC) at 550 nm was determined to be 9.0±1.3, 8.9±1.5, 9.5±2.0, and 10.3±1.7 m2 g−1 in spring, summer, fall, and winter, respectively with an annual mean of 9.4±1.8 m2 g−1. Threshold values to classify severe haze events were suggested in this study. Increasing trend of aerosol single scattering albedo (SSA) with wavelength was observed during Asian dust events while little spectral dependence of SSA was observed during long-range transport pollution (LTP) events. Satellite aerosol optical thickness (AOT) and Hysplit air mass backward trajectory analyses as well as chemical analysis were performed to characterize the dependence of spectral optical properties on aerosol type. Results from this study can provide useful information for studies on regional air quality and aerosol's effects on climate change. </P>