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Raman Spectroscopy of Biphenyl-4,4'-dithiol and p-Terphenyl-4,4″-dithiol on Gold Surfaces#
Erdene Ochir Ganbold,주상우 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
We compared the adsorption behaviors of 1,4-benzenedithiol (BDT), biphenyl-4,4′-dithiol (BPDT), and p-terphenyl-4,4″-dithiol (TPDT) on gold (Au) surfaces. To check the surface orientations and possibility of multilayer formation, surface-enhanced Raman scattering was employed for the three aromatic dithiols on gold nanoparticles (AuNPs). The Raman spectra of BDT and BPDT on AuNPs were examined, whereas those of TPDT could be obtained on an Au-coated nanostructured silicon plate. Unlike BDT, BPDT and TPDT did not exhibit a ν(S–H) band at 2560 cm−1. Because of the additional benzene rings, multilayer formation is improbable for BPDT and TPDT under colloidal conditions.
Cloning of a novel endogenous promoter for foreign gene expression in Phaeodactylum tricornutum
ERDENE OCHIR ERDENEDOLGOR,신복규,HUDA MD NAZMUL,김다혜,이은하,송대근,김윤미,김상민,판철호 한국응용생명화학회 2016 Applied Biological Chemistry (Appl Biol Chem) Vol.59 No.6
Phaeodactylum tricornutum is a model diatom, and its genomic sequence data and expressed sequence tag databases are available. This study was to discover a new endogenous promoter that drives strong constitutive expression of a protein of interest in P. tricornutum. To find promoter candidates, the intracellular proteins of P. tricornutum grown to stationary phase were extracted and identified by LC–MS/MS. Glutamine synthetase (GLNA) was one of the most abundantly expressed proteins during the stationary phase. Promoter is usually located on 5′ upstream region of open reading frame of the gene. Thus, two fragments of 5′ upstream region of the GLNA gene as putative promoters, 501 and 997 bp long, were amplified and cloned into enhanced Green Fluorescent Protein (eGFP) reporter systems. The constructed reporter systems were transformed into P. tricornutum and the eGFP expression levels were compared to those of reporter systems using the promoters of fcpA (fucoxanthin chlorophyll a/c binding protein A) and CIP1 (putative replication-associated proteins of a Chaetoceros lorenzianus-infecting DNA virus) as controls. The expression of eGFP driven by either GLNA promoter (501 and 997 bp) was linearly related to cell density, and eGFP was expressed constitutively regardless of the cultivation phase. The eGFP expression level driven by the GLNA promoters was at least 4 times higher than the fcpA-driven eGFP expression level at the stationary phase. The 501 and 997 bp regions of the GLNA promoter had similar activity patterns for transcribing the downstream gene. These results indicate that at least 501-bp region of the GLNA promoter can be used as a strong constitutive promoter in genetic engineering of P. tricornutum.
Erdene-Ochir Ganbold,Jin-Ho Park,Kwang-Su Ock,주상우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
We studied the detection of the Hg(II) concentration in an aqueous solution using rhodamine dyes on citrate-reduced Au nanoparticles (NPs). The quenching effect from Au NPs was found to decrease as the Hg(II) concentration increased under our experimental conditions. As the fluorescence signals intensified, the surface-enhanced Raman scattering (SERS) intensities reduced on the contrary due to less rhodamine dyes on Au NPs as the Hg(II) concentration increased. The rhodamine 6G (Rh6G) and rhodamine 123 (Rh123) dyes were examined via fluorescence and SERS measurements depending on Hg(II) concentrations. Fast and easy fluorescence detection of an Hg (II) concentration as low as a few ppm could be achieved by naked eye using citrate-reduced Au NPs.
Norov, Erdene,Jeong, Hyeon-Ho,Park, Jae-Hyoung,Lee, Seung-Ki,Jeong, Dae Hong Korean Society of Photoscience 2013 Rapid communication in photoscience Vol.2 No.2
This study reports a fiber-optic sensor detecting biomolecule by simultaneously monitoring localized surface plasmon resonance (LSPR) from gold nanoparticles (Au NPs) of ca. $50{\pm}5$ nm attached on one end of optical fiber and surface enhanced Raman scattering (SERS) of the reporter molecules adsorbed on the gold surfaces as an additional sensing tool. The sensor was fabricated by immobilizing Au NPs on one end of an optical fiber by chemical reaction. LSPR and SERS signals of the sensor were measured using various refractive indices solutions. Finally, the sensor was applied to observe real-time LSPR sensor-gram and SERS spectra of the reporter molecule of 4-aminothiphenol during the antibody-antigen reaction of interferon-gamma (IFN-${\gamma}$) as a proof-concept experiment of biological applications.
Sources and fluxes of Pt, Ir and REE in the Seoul metropolitan area through wet scavenging processes
Soyol-Erdene, Tseren-Ochir,Han, Yeongcheol,Lee, Borom,Huh, Youngsook Elsevier 2011 Atmospheric environment Vol.45 No.11
<P><B>Abstract</B></P><P>Platinum group elements (PGEs: Pt and Ir) and rare earth elements (REEs) were analyzed in rainwater samples collected in Seoul during the summer of 2008 to identify their sources and quantify their wet-deposition fluxes to the Earth’s surface environment. Major (Na, K, Mg, Ca, NH<SUB>4</SUB><SUP>+</SUP>, SO<SUB>4</SUB><SUP>2−</SUP>, NO<SUB>3</SUB><SUP>−</SUP>, Cl<SUP>−</SUP> and F<SUP>−</SUP>) and minor (Fe, Ba, Y and Hf) elements were also measured to facilitate interpretation. Evaluation of elemental correlations, crustal enrichment factors, Ir/Pt ratios and REE patterns indicated meteoric/volcanic sources for Pt and Ir and additional anthropogenic sources for Pt. REEs were predominantly of crustal origin. The relationship between concentrations and rainfall indicated that below-cloud scavenging (wash-out) was the main scavenging mechanism for most elements. The wet-deposition fluxes in Seoul were higher than those recorded in polar ice cores for Pt and Ir and were comparable to those from other rainwater studies of REEs in East Asia.</P> <P><B>Research highlights</B></P><P>► We identify the sources and quantify the wet-deposition fluxes of Pt, Ir and REE. ► Pt and Ir had meteoric/volcanic sources and additional anthropogenic sources for Pt. ► REEs were predominantly of crustal origin. ► Ir and REE were removed by below-cloud scavenging (wash-out). ► The wet-deposition fluxes in Seoul were higher than in polar ice cores for Pt and Ir.</P>
Cooled EGR이 농도성층화가 존재하는 DME HCCI 엔진 연소에 미치는 영향에 관한 수치해석 연구
Soyol-Erdene,정동원(Dongwon Jeong),권오석(Oseock Kwon),임옥택(Ocktaeck Lim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Homogeneous charge compression ignition (HCCI) engines have the potential to provide both diesel-like efficiency and very low emissions of nitrogen oxides (NOx) and particulates. Before this potential can be realized, however, extending HCCI operation to high loads must be resolved by lowering the pressure-rise rate. For lowering the steep pressure rise rate occurred in high load, cooled exhaust-gas recirculation (Cooled EGR) and fuel stratification of pre-mixture in cylinder are recommended as one of the effective ways. Conduct numerical analysis to combination of cooled EGR and fuel stratification for confirming enhanced effect to lowering pressure rise rate, after indentifying each effect on extending HCCI operating ranges. Fuelling width in cylinder is φ=0.15 and CO₂ is used as a simulated cooled EGR. DME which has a characteristic of two-stage ignition is used as a fuel.