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이현순,한부길,김대중 圓光大學校 1996 論文集 Vol.31 No.2
GeS 결정은 승화법에 의해 성장시키고 GeSe 결정은 vapour transport 방법을 이용하여 성장시켰다. GeS와 GeSe 결정은 orthorhombic 구조를 가지고 있다. 297K에서 optical energy gap은 1.64eV(GeS), 1.51eV(GeSe)이고, GeS의 광전도도는 764nm에서 peak가 나타난다. GeSe의 전기적 특성을 알아보기 위하여 van der Pauw 방법을 사용하여 Hall 효과를 측정했다. Crystals of GeS were obtained by sublimation of GeS chunks between 520℃ and 580℃ in closed evacuated (10?? torr) quartz ampoule using a vertical pulling method, and GeSe crystals were grown in an ampoule by vapour transport method. Both GeS and GeSe crystals had the orthorhombic structures and the lattice constants were measured to be ??, ?? and ?? (GeS); ??, ??, ?? (GeSe), respectively. At the temperature of 297K the optical energy gaps were 1.64eV (GeS), 1.51eV (GeSe), respectively. The photocurrent spectra of GeS measured at room temperature show a peak at 764nm. In order to investigate the temperature dependence of the electrical characteristies of GeSe crystals, the Hall effect was measured by using van der Pauw method.
( Sang Kyung Jung ),( Kyung Ah Kim ),( So Young Ha ),( Hyun Kyo Lee ),( Young Doo Kim ),( Bu Hyun Lee ),( Woo Hyun Paik ),( Jong Wook Kim ),( Won Ki Bae ),( Nam Hoon Kim ),( June Sung Lee ),( Yoon Jun 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.1
Background/Aims: This study investigated the antiviral effects of tenofovir disoproxil fumarate (TDF) monotherapy in nucleos(t)ide analogue (NA)-naive and NA-experienced chronic hepatitis B (CHB) patients. Methods: CHB patients treated with TDF monotherapy (300 mg/day) for ≥12 weeks between December 2012 and July 2014 at a single center were retrospectively enrolled. Clinical, biochemical, and virological parameters were assessed every 12 weeks. Results: In total, 136 patients (median age 49 years, 96 males, 94 HBeAg positive, and 51 with liver cirrhosis) were included. Sixty-two patients were nucleos(t)ide (NA)-naive, and 74 patients had prior NA therapy (NA-exp group), and 31 patients in the NA-exp group had lamivudine (LAM)-resistance (LAM-R group). The baseline serum hepatitis B virus (HBV) DNA level was 4.9±2.3 log IU/mL (mean±SD ), and was higher in the NA-naive group than in the NA-exp and LAM-R groups (5.9±2.0 log IU/mL vs 3.9±2.0 log IU/mL vs 4.2±1.7 log IU/mL, P<0.01). The complete virological response (CVR) rate at week 48 in the NA-naive group (71.4%) did not differ significantly from those in the NA-exp (71.3%) and LAM-R (66.1%) groups. In multivariate analysis, baseline serum HBV DNA was the only predictive factor for a CVR at week 48 (hazard ratio, 0.809; 95% confidence interval, 0.729.0.898), while the CVR rate did not differ with the NA experience. Conclusions: TDF monotherapy was effective for CHB treatment irrespective of prior NA treatment or LAM resistance. Baseline serum HBV DNA was the independent predictive factor for a CVR. (Clin Mol Hepatol 2015;21:41-48)
Hyun, Myung Ho,Boo, Chang-Jin,Choi, Hee-Jung,Kim, Yun-Kyoung,Kang, Bu-Sung,Ha, Hyun-Ju,Choi, Min-Ki,Tan, Guang-Hui Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.11
A new liquid chromatographic chiral stationary phase based on (2S,3S)-O,O'-bis-(10-undecenoyl)-N,N'-bis-(3,5-dinitrobenzoyl)-2,3-diamino-1,4-butandiol was prepared starting from (2R,3R)-1,4-bis(benzyloxy)-2,3-butanediol. The new chiral stationary phase was applied to the resolution of racemic anilide derivatives of N-acetyl-a-amino acids, 1,1'-bi-2-naphthol and 3,3'-diaryl-1,1'-bi-2-naphthols. The CSP was also applied to the resolution of some chiral drugs including a diuretic, bendroflumethiazide, and non-steroidal anti-inflammatory agents such naproxen and alminoprofen. In every case, the chiral recognition efficiency of the new CSP was quite excellent.
Hyun, Myung- Ho,Choi, Hee-Jung,Kang, Bu-Sung,Tan, Guang-Hui,Cho, Yoon-Jae Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.11
A liquid chromatographic chiral stationary phase (CSP) based on (+)-(18-crown-6)-2,3,11,12-tetracarboxilic acid without extra free aminopropyl groups on silica surface has been demonstrated to be quite effective for the resolution of various $\beta$-amino acids. The retention factors ($k_1$) for the resolution of $\beta$-amino acids on the CSP were quite large and the large retention factors might be quite attractive along with the reasonable separation factors ($\alpha$) for preparative scale enantioselective chromatography. The large retention factors on the CSP were found to be reduced effectively by adding ammonium ion to mobile phase without sacrificing the chiral recognition efficiency of the CSP. Consequently, the CSP is also quite applicable for use in analytical enantioselective chromatography.