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Ryu, Ka Young,Lee, Seong Youl,Park, Dae Yul,Kim, So Young,Kim, Cheal Elsevier 2017 Sensors and actuators. B Chemical Vol.242 No.-
<P><B>Abstract</B></P> <P>A novel multifunctional and highly selective chemosensor <B>1</B>, N 2-(bis(pyridin-2-ylmethyl)amino)-<I>N</I>-(2-((2,4-dinitrophenyl)amino)phenyl)acetamide, for Co<SUP>2+</SUP> and S<SUP>2−</SUP> was designed and synthesized. Sensor <B>1</B> showed a selective colorimetric sensing ability for cobalt ion by changing color from pale yellow to light green in a near perfect aqueous solution. The detection limit (0.99μM) of <B>1</B> for Co<SUP>2+</SUP> was lower than the Environmental Protection Agency (EPA) guideline (1.7μM) for drinking water. The sensor <B>1</B> could be used to quantify Co<SUP>2+</SUP> in water samples. Moreover, sensor <B>1</B> detected S<SUP>2−</SUP> selectively, which induced an obvious color change from pale yellow to pink over most other competitive anions in aqueous solution. The sensing mechanism of Co<SUP>2+</SUP> by <B>1</B> was proposed to be a ligand-to-metal charge-transfer (LMCT) with the experimental results and theoretical calculations, and that of S<SUP>2−</SUP> by <B>1</B> proposed to be a deprotonation process. Therefore, this sensor <B>1</B> could be used as a practical system for monitoring both Co<SUP>2+</SUP> and S<SUP>2−</SUP> in an aqueous environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New dinitrobenzene-containing chemosensor <B>1</B> was developed as a colorimetric sensor for Co<SUP>2+</SUP> and S<SUP>2−</SUP>. </LI> <LI> Sensor <B>1</B> detected Co<SUP>2+</SUP> from pale yellow to light green through LMCT mechanism. </LI> <LI> Sensor <B>1</B> detected S<SUP>2−</SUP> from pale yellow to pink through deprotonation process. </LI> <LI> Detection limit of <B>1</B> for Co<SUP>2+</SUP> was lower than the Environmental Protection Agency guideline. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Dong Hwan,Lee, Jun Yong,Ryu, Ji Young,Kim, Youngmee,Kim, Cheal,Lee, Ik-Mo Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.7
New nickel complexes containing novel tetradentate ligands, 4,5-substituted-1,2-bis(pyridine-2-carboxamide)-benzene ligands but lacking alkyl or halide ligands in the coordination sphere have been prepared. They were activated with MMAO (modified methylaluminoxane) to be proven as efficient catalysts for the polymerization of norbornene. Both electron-donating and -withdrawing substituents on the benzene ring and polar solvents enhance the catalytic activity for olefin polymerization. Improvement in thermal stability of the complexes was observed. Some of these complexes were crystallographically determined to have square planar geometry. A plausible mechanism involving dissociation of ligands is proposed.
이근대,류영철,서차수,홍성수,안병현,문명준 ( Gun Dae Lee,Young Cheal Ryu,Cha Soo Suh,Seong Soo Hong,Byung Hyun Ahn,Myung Jun Moon ) 한국공업화학회 1997 공업화학 Vol.8 No.2
여러 종류의 용제와 수지용액에 있어서의 CaCO₃ 안료의 분산 안정성을 Dynometer를 이용하여 조사하였다. Dynometer를 이용하여 비교적 단시간에 분산계의 분산 안정성을 평가할 수 있었으며, Dynometer를 이용한 분산 안정성 평가로부터 구한 CaCO₃ 안료의 용해성 파라미터, δ는 11.62(δ_d = 8.04, δ_p = 5.05, δ_h = 6.70) 이었다. 안료와 친화력이 약한 용제가 첨가되는 경우 수지 용액내에서의 안료표면에의 수지 흡착층을 증가시켜 수지 용액내에서의 분산 안정성을 증가시켰다. 수지 용액 제조시 소량첨가된 용제도 안료를 포함한 전체 분산계의 유동성과 분산 안정성에 큰 영향을 미친다는 것을 알 수 있었다. The effect of solvent on the dispersion stability of CaCO₃ pigment in various solvents and resin solutions has been studied using Dynometer. Dispersion stability can be estimated in a relatively short time by means of Dynometer and the solubility parameter, δ, of CaCO₃ determined from dispersion stability was 11.62(δ_d = 8.04, δ_p = 5.05, δ_h = 6.70). The solvent showing weaker interaction with pigment increased the adsorption of resin on to the pigment, resulting in higher dispersion stability in resin solution. It was found that the rheological properties and dispersion stability of pigmented resin solution were depending strongly on the solvent added in small amount in the formulation.
CaCO<sub>3</sub> 안료의 분산 안정성에 대한 용제의 영향
이근대,류영철,서차수,홍성수,안병현,문명준,Lee, Gun Dae,Ryu, Young Cheal,Suh, Cha Soo,Hong, Seong Soo,Ahn, Byung Hyun,Moon, Myung Jun 한국공업화학회 1997 공업화학 Vol.8 No.2
여러 종류의 용제와 수지용액에 있어서의 $CaCO_3$ 안료의 분산 안정성을 Dynometer를 이용하여 조사하였다. Dynometer를 이용하여 비교적 단시간에 분산계의 분산 안정성을 평가할 수 있었으며, Dynometer를 이용한 분산 안정성 평가로부터 구한 $CaCO_3$ 안료의 용해성 파라미터, ${\delta}$는 11.62(${\delta}_d=8.04$, ${\delta}_p=5.05$, ${\delta}_h=6.70$)이었다. 안료와 친화력이 약한 용제가 첨가되는 경우 수지 용액내에서의 안료표면에의 수지 흡착층을 증가시켜 수지 용액내에서의 분산 안정성을 증가시켰다. 수지 용액 제조시 소량 첨가된 용제도 안료를 포함한 전체 분산계의 유동성과 분산 안정성에 큰 영향을 미친다는 것을 알 수 있었다. The effect of solvent on the dispersion stability of $CaCO_3$ pigment in various solvents and resin solutions has been studied using Dynometer. Dispersion stability can be estimated in a relatively short time by means of Dynometer and the solubility parameter, ${\delta}$, of $CaCO_3$ determined from dispersion stability was 11.62(${\delta}_d=8.04$, ${\delta}_p=5.05$, ${\delta}_h=6.70$). The solvent showing weaker interaction with pigment increased the adsorption of resin on to the pigment, resulting in higher dispersion stability in resin solution. It was found that the rheological properties and dispersion stability of pigmented resin solution were depending strongly on the solvent added in small amount in the formulation.
석창포(石菖蒲) 전탕액(煎湯液)이 Glucose Oxidase에 의해 손상(損傷)된 대뇌피질(大腦皮質) 신경세포(神經細胞)에 미치는 영향(影響)
최공한,박승택,류도곤,최민호,허진영,강성도,고정수,양상철,성은경,조남수,이춘우,서의석,류영수,Choi, Kong-Han,Park, Seung-Taeck,Ryu, Do-Gon,Choi, Min-Ho,Hea, Jin-Young,Kang, Sung-Do,Go, Jeong-Soo,Yang, Sang-cheal,Sung, Yeun-Kyung,Cho, Nam-Su,L 대한동의생리학회 1999 동의생리학회지 Vol.14 No.2
The purpose of this study is to examine the toxic effects caused by Glucose Oxidase(GO) and the effects of herbal extracts such as Acori Rhizoma(AR) on the treatment of the toxic effects. For this purpose, experiments with the cultured cell from the cerebrums of new born mice were done. The results of these experiments were as follows. 1. GO, a oxygen radical, decreased the survival rate of the cultured cells on NR assay and MTT assay. 2. GO, a oxygen radical, decreased the amount of neurofilaments and total protein. 3. AR have efficacy of increasing the amount of neurofilament. 4. AR have efficacy of increasing the amount of total protein. From the above results, It is concluded that AR has marked efficacy as a treatment for the damages caused in the GO-mediated oxidative process. And AR is thought to have certain pharmacological effects on controlling over aging. Further clinical study of this pharmacological effects of AR should be complemented.