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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.
PEGylation density-modulated anticancer drug release on gold nanoparticles in live cells
윤진하,Erdene Ochir Ganbold,주상우 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Glutathione (GSH)-triggered drug releases of the anticancer drug mitoxantrone from a polyethyleneglycol (PEG) (molecular weight: 5000) density-modulated drug delivery system up to 0.57 nm 2 of goldnanoparticles (AuNPs) were examined using bimodal spectroscopic imaging techniques of live-cellfluorescence imaging and surface-enhanced resonance Raman scattering (SERRS). Prolonged deliveryamounts and sustained drug releases after introducing a high PEG density on AuNPs was supported by acell viability test in HeLa cells. A subcutaneous in vivo test also indicated that the SERRS spectra could beobserved only for the PEGylated AuNPs after external GSH treatment in consistent with the fluorescencemeasurements.
Soyol-Erdene, Tseren-Ochir,Huh, Youngsook,Hong, Sungmin,Hur, Soon Do American Chemical Society 2011 Environmental science & technology Vol.45 No.14
<P>Antarctic snow preserves an atmospheric archive that enables the study of global atmospheric changes and anthropogenic disturbances from the past. We report atmospheric deposition rates of platinum group elements (PGEs) in Antarctica during the last ∼50 years based on determinations of Pt, Ir, and Rh in snow samples collected from Queen Maud Land, East Antarctica to evaluate changes in the global atmospheric budget of these noble metals. The 50-year average PGE concentrations in Antarctic snow were 17 fg g<SUP>–1</SUP> (4.7–76 fg g<SUP>–1</SUP>) for Pt, 0.12 fg g<SUP>–1</SUP> (<0.05–0.34 fg g<SUP>–1</SUP>) for Ir, and 0.71 fg g<SUP>–1</SUP> (0.12–8.8 fg g<SUP>–1</SUP>) for Rh. The concentration peaks for Pt, Ir, and Rh were observed at depths corresponding to volcanic eruption periods, indicating that PGEs can be used as a good tracer of volcanic activity in the past. A significant increase in concentrations and crustal enrichment factors for Pt and a slight enhancement in enrichment factors for Rh were observed after the 1980s. This suggests that there has been large-scale atmospheric pollution for Pt and probably for Rh since the 1980s, which may be attributed to the increasing emissions of these metals from anthropogenic sources such as automobile catalysts and metal production processes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2011/esthag.2011.45.issue-14/es2005732/production/images/medium/es-2011-005732_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es2005732'>ACS Electronic Supporting Info</A></P>
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>
Ganbold, Erdene-Ochir,Park, Jin-Ho,Ock, Kwang-Su,Joo, Sang-Woo Korean Chemical Society 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.