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Quantum Dot/Siloxane Composite Film Exceptionally Stable against Oxidation under Heat and Moisture
Kim, Hwea Yoon,Yoon, Da-Eun,Jang, Junho,Lee, Daewon,Choi, Gwang-Mun,Chang, Joon Ha,Lee, Jeong Yong,Lee, Doh C.,Bae, Byeong-Soo American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.50
<P>We report on the fabrication of a siloxane-encapsulated quantum dot (QD) film (QD-silox film), which exhibits stable emission intensity for over 1 month even at elevated temperature and humidity. QD-silox films are solidified via free radical addition reaction between oligosiloxane resin and ligand molecules on QDs. We prepare the QD-oligosiloxane resin by sol gel condensation reaction of silane precursors with QDs blended in the precursor solution, forgoing ligand-exchange of QDs. The resulting QD-oligosiloxane resin remains optically clear after 40 days of storage, in contrast to other QD-containing resins which turn turbid and ultimately form sediments. QDs also disperse uniformly in the QD-silox film, whose photoluminescence (PL) quantum yield (QY) remains nearly unaltered under harsh conditions; for example, 85 degrees C/5% relative humidity (RH), 85 degrees C/85% RH, strongly acidic, and strongly basic environments for 40 days. The QD-silox film appears to remain equally emissive even after being immersed into boiling water (100 degrees C). Interestingly, the PL QY of the QD-silox film noticeably increases when the film is exposed to a moist environment, which opens a new, facile avenue to curing dimmed QD-containing films. Given its excellent stability, we envision that the QD-silox film is best suited in display applications, particularly as a PL-type down-conversion layer.</P>
Streptomyces albus로부터 분리된 Type Ⅱ Polyketide Synthase 유전자의 염기 서열 및 분석
권형진,Huchinson C.R.,진형종,김수언,이계준,서주원 한국산업미생물학회 1995 한국미생물·생명공학회지 Vol.23 No.2
Polyketide 계 이온 투과성 항생제인 salinomycin의 생성 균주인 Streptomyces albus에서 그 생합성 유전자를 분리하기 위하여, actI을 probe로 이용하여 S. albus ATCC 21838 유전자 library로부터 약 24 kb의 S. albus DNA를 포함하고 있는 pWHM 210을 분리하였다. 이 24 kb DNA 중에서 actI에 유사성을 보이는 3.8 kb BamHI 절편을 분리하여 염기 서열을 결정, 분석하였다. 이 영역에 존재하는 두개의 완전한 ORFs가 type II PKS(polyketide synthase)의 β-ketoacyl synthase/acyl transferase와 chain length determining factor 유전자에 해당하는 것임을 확인할 수 있었다. 이들은 잘 보존된 minimal type II PKS 유전자의 일부로, 알려진 다른 type II PKS 유전자들과 높은 유사성을 보였다. Streptomyces albus wild type ATCC 21838 produced salinomycin, polyether antibiotic. To clone genes related salinomycin production, a genomic library was screened using act1 as a DNA hybridization probe. PWHM 210 was isolated, which contained an approximately 24 kb of insert DNA. A 3.8 kb region in the 24 kb insert DNA was hybridized to act1 and the nucleotide sequence of this region was determinied. Two open reading frames found in the same direction were homologous to genes for β-keto acyl synthase/acyl transferase and chain length determining factor in type II PKS (polyketide synthase). The genes were components of minimal type II PKS genes, highly conserved and showed the strong simlarity to other type II PKS genes known today.
도시와 농촌 비둘기 및 인체혈액중의 Vanadium 농도 산정에 관한 연구
문덕환,김준연,김정균 인제대학교 1985 仁濟論叢 Vol.1 No.1
This experiment determined the vanadium concentration in pigeon liver and lung tissues from rural and urban areas and .in bloods of workers (male 20, female 6) by carbon furnace Atomic Absorption spectrometry. The purpose of this experiment was in investigating the status of vanadium pollution in atmosphere. The summarized results were as follows : 1.The mean concentration of vanadium in pigeon liver and lung tissues from rural areas was 36.9±2.04ppb and 58.9±2.94ppb, respectively. 2.The mean concentration of vanadium in pigeon liver and lung tissues from urban areas was 64.0±2.62ppb and 91.7±4.26ppb, respectively. 3.The mean concentration of vanadium in pigeon liver and lung tissues from urban areas was more higher than that of rural (P〈0.05). 4.The mean concentration of vanadium in blood of workers(male 20, female 6) was 23.7±3.48ppb.
Simulating the 3.4-Micron Feature of Titan's Haze
Kim, Y.S.,Ennis, C.,Kim, Sang Joon Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
Four prominent features of Titan's haze are found within the '3.4-${\mu}m$' absorption to be uniform with recent vertically resolved Cassini/VIMS spectra. These are absorptions at 2998 $cm^{-1}$ (3.34 ${\mu}m$), 2968 $cm^{-1}$ (3.37 ${\mu}m$), 2927 $cm^{-1}$ (3.42 ${\mu}m$), and 2882 $cm^{-1}$ (3.47 ${\mu}m$). A detailed fitting suggests that the 2998 $cm^{-1}$ feature could originate from amorphous acetonitrile ($CH_3CN$) carrying about 25% of integrated optical depth; the remaining features, which account for 75% of the integrated optical depth, could arise from a distinct triplet (C-H stretching) structure of radiolyzed hydrocarbons. An additional feature was possibly evidenced at altitudes higher than 300 km and attributable to 'polymer-capped' methane ($CH_4$), significantly constraining the chemical composition of organic haze layers under Titan's active radiation field.
Improved memory and reduced anxiety in δ-catenin transgenic mice
Ryu, Taeyong,Park, Hyung Joon,Kim, Hangun,Cho, Young-Chang,Kim, Byeong C.,Jo, Jihoon,Seo, Young-Woo,Choi, Won-Seok,Kim, Kwonseop Academic Press 2019 Experimental neurology Vol.318 No.-
<P><B>Abstract</B></P> <P>δ-Catenin is abundant in the brain and affects its synaptic plasticity. Furthermore, loss of δ-catenin is related to the deficits of learning and memory, mental retardation (cri-du-chat syndrome), and autism. A few studies about δ-catenin deficiency mice were performed. However, the effect of δ-catenin overexpression in the brain has not been investigated as yet. Therefore we generated a δ-catenin overexpressing mouse model. To generate a transgenic mouse model overexpressing δ-catenin in the brain, δ-catenin plasmid having a Thy-1 promotor was microinjected in C57BL/6 mice. Our results showed δ-catenin transgenic mice expressed higher levels of N-cadherin, β-catenin, and p120-catenin than did wild type mice. Furthermore, δ-catenin transgenic mice exhibited better object recognition, better sociability, and lower anxiety than wild type mice. However, both mice groups showed a similar pattern in locomotion tests. Although δ-catenin transgenic mice show similar locomotion, they show improved sociability and reduced anxiety. These characteristics are opposite to the symptoms of autism or mental retardation, which are caused when δ-catenin is deficient. These results suggest that δ-catenin may alleviate symptoms of autism, Alzheimer's disease and mental retardation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> δ-Catenin transgenic mice had improved object recognition. </LI> <LI> δ-Catenin transgenic mice showed improved social interactions. </LI> <LI> δ-Catenin transgenic mice showed less anxiety. </LI> </UL> </P>
Cho, Jung Sun,Youn, Ho-Joong,Her, Sung-Ho,Park, Maen Won,Kim, Chan Joon,Park, Gyung-Min,Jeong, Myung Ho,Cho, Jae Yeong,Ahn, Youngkeun,Kim, Kye Hun,Park, Jong Chun,Seung, Ki Bae,Cho, Myeong Chan,Kim, C The Korean Academy of Medical Sciences 2015 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.30 No.7
<P>The prognostic value of the left ventricle ejection fraction (LVEF) after acute myocardial infarction (AMI) has been questioned even though it is an accurate marker of left ventricle (LV) systolic dysfunction. This study aimed to examine the prognostic impact of LVEF in patients with AMI with or without high-grade mitral regurgitation (MR). A total of 15,097 patients with AMI who received echocardiography were registered in the Korean Acute Myocardial Infarction Registry (KAMIR) between January 2005 and July 2011. Patients with low-grade MR (grades 0-2) and high-grade MR (grades 3-4) were divided into the following two sub-groups according to LVEF: LVEF ≤ 40% (n = 2,422 and 197, respectively) and LVEF > 40% (n = 12,252 and 226, respectively). The primary endpoints were major adverse cardiac events (MACE), cardiac death, and all-cause death during the first year after registration. Independent predictors of mortality in the multivariate analysis in AMI patients with low-grade MR were age ≥ 75 yr, Killip class ≥ III, N-terminal pro-B-type natriuretic peptide > 4,000 pg/mL, high-sensitivity C-reactive protein ≥ 2.59 mg/L, LVEF ≤ 40%, estimated glomerular filtration rate (eGFR), and percutaneous coronary intervention (PCI). However, PCI was an independent predictor in AMI patients with high-grade MR. No differences in primary endpoints between AMI patients with high-grade MR (grades 3-4) and EF ≤ 40% or EF > 40% were noted. MR is a predictor of a poor outcome regardless of ejection fraction. LVEF is an inadequate method to evaluate contractile function of the ischemic heart in the face of significant MR.</P>
Kang, Suhee,Pawar, Rajendra C.,Park, Tae Joon,Kim, Jin Geum,Ahn, Sung-Hoon,Lee, Caroline Sunyong The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.4
We have successfully fabricated 3D (3-dimensional) nanostructures of $TiO_2$ coated with a $g-C_3N_4$ layer via hydrothermal and sintering methods to enhance photoelectrochemical (PEC) performance. Due to the coupling of $TiO_2$ and $g-C_3N_4$, the nanostructures exhibited good performance as the higher conduction band of $g-C_3N_4$, which can be combined with $TiO_2$. To fabricate 3D nanostructures of $g-C_3N_4/TiO_2$, $TiO_2$ was first grown as a double layer structure on FTO (Fluorine-doped tin oxide) substrate at $150^{\circ}C$ for 3 h. After this, the $g-C_3N_4$ layer was coated on the $TiO_2$ film at $520^{\circ}C$ for 4 h. As-prepared samples were varied according to loading of melamine powder, with values of loading of 0.25 g, 0.5 g, 0.75 g, and 1 g. From SEM and TEM analysis, it was possible to clearly observe the 3D sample morphologies. From the PEC measurement, 0.5 g of $g-C_3N_4/TiO_2$ film was found to exhibit the highest current density of $0.12mA/cm^2$, along with a long-term stability of 5 h. Compared to the pristine $TiO_2$, and to the 0.25 g, 0.75 g, and 1 g $g-C_3N_4/TiO_2$ films, the 0.5 g of $g-C_3N_4/TiO_2$ sample was coated with a thin $g-C_3N_4$ layer that caused separation of the electrons and the holes; this led to a decreasing recombination. This unique structure can be used in photoelectrochemical applications.