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기계적 밀링 및 방전 플라즈마 소결 공정을 이용한 벌크 비정질 복합재의 제조
이진규,김택수,김정곤,Lee, Jin-Kyu,Kim, Taek-Soo,Kim, Jeong-Gon 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3
Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.
유전자 재조합 대장균으로부터 인간 Interferon - β
이진규,이석재,최문기,정광희,신광순,백승복 ( Jin Kyu Lee,Jae Lee,Moon Kee Choe,Kwang Hoe Chung,Kwang Soon Shin,Sung Bok Paik ) 생화학분자생물학회 1990 BMB Reports Vol.23 No.2
Glutathione S-transferase ρ (EC 2.5.1.18) has been purified to homogeneity from human erythrocytes. A combination of gel filtration, ion exchange and hydroxylapatite chromatographic procedure yields the specific activity of 20.8 units/㎎. The purified enzyme gives a single band corresponding to 24,000 M.W. on a sodium dodecyl sulfate polyacrylamide gel electrophoresis. The enzyme molecule is characterized to be an acidic protein (pI 4.6) having a dimeric structure with 48,000 M.W. composed of identical size of polypeptide chains. Apparent K_m and V_(max) were determined to be 1.1 mM and 1.0 mmol/1/min for 1-chloro-2,4-dinitro benzene respectively while 0.3 mM and 0.55 mmol/l/min for glutathione. Results obtained from chemical modification studies suggest that essential amino group(s) critically connected to the catalytic function of glutathione S-transferaseρ.
유전자 재조합 대장균으로부터 인간 Interferon - α2 의 정제
이진규,강인철,박성희,정광희,문홍모 ( Jin Kyu Lee,In Chul Kang,Sung Hee Park,Kwang Hoe Chung,Hong Mo Moon ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.1
Recombinant human IFN-α2 was purified from E. coli by methods involving sonication, extraction with 8 M Guanidine-HCI, dilution, CuSO₄ fractionation, copper-chelating column chromatography, S-Sepharose column chromatography. Specific activity of purified IFN-α2 was 1.6 × 10^9 IU/㎎ protein and the degree of purification was 94 fold from the starting material. Purified IFN-α2 was formed a single band on SDS-PAGE under reducing condition and also on non-reducing condition. Its molecular weight was estimated to be 18,000 dalton and the isoelectric point of purified IFN-α2 was 6.0. Purity of the recombinant IFN-α2 was better than 99% by densitometric analysis of SDS-PAGE.
이진규,Lee, Jin-Kyu 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.4
The Ni-based bulk metallic glass matrix composites were fabricated by spark plasma sintering of mixture of gas-atomized metallic glass powders and ductile brass powders. The successful consolidation of metallic glass matrix composite was achieved by strong bonding between metallic glass powders due to viscous flow deformation and lower stress of ductile brass powders in the supercooled liquid state during spark plasma sintering. The composite shows some macroscopic plasticity after yielding, which was obtained by introducing a ductile second brass phase in the Ni-based metallic glass matrix.
Spark Plasma Sintering에 의한 가스분무 Mg-Zn-Y 합금분말의 성형특성
이진규,김택수,배정찬,Lee, Jin-Kyu,Kim, Taek-Soo,Bae, Jung-Chan 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.2
Using Spark Plasma Sintering process (SPS), consolidation behavior of gas atomized $Mg_{97}Zn_1Y_2$ alloys were investigated via examining the microstructure and evaluating the mechanical properties. In the atomized ahoy powders, fine $Mg_{12}YZn$ particles were homogeneously distributed in the ${\alpha}-Mg$ matrix. The phase distribution was maintained even after SPS at 723 K, although $Mg_{24}Y_5$ particles were newly precipitated by consolidating at 748 K. The density of the consolidated bulk Mg-Zn-Y alloy was $1.86g/cm^3$. The ultimate tensile strength (UTS) and elongation were varied with the consolidation temperature.
Purification of Human Interferon-${\beta}$ from Recombinant E. coli
이진규,이석재,최문기,정광회,신광순,백승복,Lee, Jin-Kyu,Lee, Seok-Jae,Choe, Moon-Kee,Chung, Kwang-Hoe,Shin, Kwang-Soon,Paik, Sung-Bok 생화학분자생물학회 1990 한국생화학회지 Vol.23 No.2
유전자 재조합 인간 Interferon-${\beta}$를 초음파 처리, 8 M Guanidine-HCl 추출, inclusion body의 용해, 희석, Blue Sepharose CL-6B column chromatography, HPLC gel filtration 방법 등을 이용하여 대장균으로부터 정제하였다. 정제된 IFN-${\beta}$의 specific activity는 $3.1{\times}10^8$ IU/mg이었고 정제도는 1,902이었다. 정제된 IFN-${\beta}$는 환원된 상태와 환원되지 않은 상태에서 SDS polyacrylamide gel electrophoresis 한 결과 모두 단일 띠로 나타났으며 분자량은 18,000 dalton이었다. N-말단 아미노산을 조사한 결과 재조합 인간 IFN-${\beta}$는 천연형 인간IFN-${\beta}$와 같이 N-말단이 methionine임이 밝혀졌다. 전자 현미경을 이용하여 inclusion body 형성을 조사한 결과 IFN-${\beta}$ 유전자를 가지고 있는 대장균에서는 inclusion body의 형성을 확인할 수 있었으나 숙주(wild type)에서는 확인되지 않았다. 최종적으로 정제된 IFN-${\beta}$의 정제도는 HPLC gel filtration 한 결과 99% 이상으로 나타났다. Recombinant human interferon-${\beta}$ was purified to homogeneity from E. coli by methods of sonication, extraction with 8 M Guanidine HCl, solubilization of inclusion body, dilution, Blue Sepharose CL-6B column chromatography and HPLC gel filtration. Specific activity of purified IFN-${\beta}$ was $3.1{\times}10^8$ IU/mg protein and the purification was 1,902 fold. The purified IFN-${\beta}$ was a single band on SDS polyacrylamide gel electrophoresis under reducing condition and non-reducing condition and its molecular weight was estimated to 18,000 dalton. The results of N-terminal analysis showed that recombinant human IFN-${\beta}$ has N-terminal methionine same as natural human IFN-${\beta}$. The inclusion bodies were observed in the E. coli cells harboring IFN-${\beta}$ gene but not observed in the host cells (MM 294). The purity of finally purified IFN-${\beta}$ was more than 99% by HPLC gel filtration.
방전플라즈마 소결법에 의한 비정질/비정질 복합재의 제조
이진규,Lee, Jin-Kyu 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The Cu-based bulk metallic glass (BMG) composites containing Zr-based metallic glass phase have been consolidated by spark plasma sintering using the mixture of Cu-based and Zr-based metallic glass powders in their overlapped supercooled liquid region. The Zr-based metallic glass phases are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation process. The successful consolidation of BMG composites with dual amorphous phases was corresponding to the sound viscous flow of the two kinds of metallic glass powders in their overlapped supercooled liquid region.
이진규,김택수,Lee, Jin-Kyu,Kim, Taek-Soo 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The Cu-based bulk metallic glass (BMG) composite was fabricated by spark plasma sintering (SPS) using of gas-atomized metallic glass powders and ductile brass powders. No defect such as pores and cavities was observed at the interface between the brass powder and the metallic glass matrix, suggesting that the SPS process caused a severe viscous flow of the metallic glass and brass phases in the supercooled liquid region, resulting in a full densification. The BMG composites shows some macroscopic plasticity after yielding, although the levels of strength decreased.