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송복식,문동찬 광운대학교 신기술연구소 1997 신기술연구소논문집 Vol.26 No.-
직접천이형 에너지갭(0.17eV)을 갖는 III-V족 2원 화합물 반도체인 InSb를 수직 브리지만법으로 성장시켜 전기-자기적 특성과 Zn의 확산성질을 조사하였다. 결정 성장속도는 1mm/hr 였으며, 성장된 결정의 격자상수 ao는 6.4863A 이었다. 불순물을 첨가하지 않은 InSb 결정의 전도형은 n형이었고, 실온에서 캐리어 농도는 2∼6×10^16㎝^-3 이었으며 캐리어 이동도는 6∼2×10^4㎝^2/V·sec 이었다. 자계를 인가하지 않았을때에 비하여 자기저항은 71.4% 증가하였고 자계가 증가할수록 자기저항은 증가하였다. 또한, 홀전압은 자계의 세기가 증가할수록 증가하였으며 10K gauss에서 36.3mV이었다. InSb 내에서 Zn의 확산깊이는 확산시간의 제곱근에 비례하여 증가하였으며, Zn가 확산하는데 필요한 활성화에너지는 0.67eV이었고 확산계수의 온도의존성은 D=4.25×10^-3 exp(-0.67 /K_BT) 이었다. Binary compound semiconductor InSb crystal which has direct-transition energy gap (0.17eV) was grown by vertical Bridgman method, then the electric-magnetic and Zn diffusion properties of InSb crystal were surveyed. The growth rate of the crystals was 1mm/hr and the lattice constant a_0 of the grown crystal was 6.4863Å. The undoped InSb crystal was n-type, the electron concentration and the electron mobility were 2~6×10^16㎝^-3 and 6~2×10^4㎝^2/V·sec at room temperature, respectively. The magnetoresistance was increased 71.4% as compared with non-applied magnetic field and the magnetoresistance was increased with increasing the magnetic field. Also, the Hall voltage was increased with increasing the magnetic field and Hall voltage was 36.3mV at 10K gauss. The diffusion depth of Zn into InSb proportionally increased with the square root of diffusion time and the activation energy for Zn diffusion was 0.67eV. The temperature dependence of diffusion coefficient was D=4.25×10^-3exp(-0.67 /K_BT).
Aspergillus candidus F1484 균주가 생산하는 항진균 화합물의 분리 및 특성
김성옥,이소영,김성규,손광희,김영국,문석식,복성해 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.5
Candida albicans의 효모형태에 대해 활성을 나타내는 항진균 물질의 탐색 중에 Aspergillus candidus F1484 균주의 발효액으로부터 항진균 화합물 F1484를 단리하고 ethyl acetate 추출, silica gel column chromatography, ODS column chromatography 및 preparative HPLC를 행하여 분리정제하였다. F1484 화합물은 EI-MS, ^13C-, ^1H-NMR, DEPT, HMQC 및 HMBC에 의한 구조분석을 행한 결과 이 화합물은 항진균 물질인 chloroflavonin과 동일한 구조를 나타내었으며 효모형태의 Candida albicans에 대한 항진균 활성뿐만 아니라 여러 종류의 인체 종양 세포주에 대해서도 세포독성을 나타내었다. In the course of screening for the antifungal compounds against Candida albicans, an antifungal compound (F1480) was isolated from the culture broth of Aspergillus candidus F1484. Isolation and purification of compound F1484 were performed using ethyl acetate extraction, silica gel column chromatography, ODS column chromatography, and preparative HPLC. The structure of compound F1484 was determined by the spectroscopic analyses of EI-MS, ^13C-, ^1H-NMR, DEPT, HMQC, and HMBC. This compound appeared to have a structure of antifungal agent, chloroflavonin. In addition to antifungal activities against the yeast phase of Candida species, compound F1484 showed cytotoxic effect against various human tumor cell lines.
Bahk, Song-Chul,Lee, Sook-Hee,Jang, Jung-Un,Choi, Chang-Uk,Lee, Bok-Soo,Chae, Soo-Cheon,Song, Hye-Jin,Park, Zee-Yong,Yang, Yun-Sik,Chung, Hun-Taeg WILEY-VCH Verlag 2006 Proteomics Vol.6 No.11
<P>Endotoxin-induced uveitis (EIU) is an animal model of acute ocular inflammation. To characterize the mechanism of EIU, we analyzed the infiltration of proteins in the vitreous bodies of rats with EIU and normal rats using 2-DE and micro LC/LC-MS/MS. Twenty spots were identified in vitreous bodies of rats. Eighteen of these spots were members of the crystallin family. The truncated form of beta A4- and beta B2-crystallin were predominant in normal vitreous bodies, but there were intact form of crystallins in lipopolysaccharide-injected rats with EIU. These results suggest that crystallin family proteins are the major group of proteins involved in uveitic vitreous and that C-terminal truncation of beta-crystallins may play a role in EIU-related disease progression.</P>