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부분방전에 의한 분해생성물 거동 모델링을 위한 예비 연구
표진수(Jin-Soo Pyo),정세훈(Sehun Jung),백승현(Seunghyun Baik),김윤제(Youn-Jae Kim),이종철(Jong-Chul Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The use of gas-insulated switchgear (GIS) has been significantly increased in electric power plants. Each component of GIS is enclosed in a metal chamber, filled with compressed gaseous sulfur hexafluoride (SF?) as an electrical insulating medium. However, partial discharge (PD) or arc discharge, generated by sharp edges or small contaminant particles inside GIS, can cause the electrical breakdown of the system. Therefore, the PD detection in the early stage has become increasingly important in order to avoid the fatal failure of GIS. As Single-walled carbon nanotubes (SWNT) is good to sence decomposition products which are produced by PD, development of SWNT sensor is proceeding recently. In this study, numerical analysis was carried out, using a commercial CFD code, Phoenics, to obtain density distribution of decomposition product in a chamber modeling.
감자 ( Solanum tuberosum ) 의 기내 소괴경 형성 단계에 따른 Peroxidase 와 Esterase 동위효소의 양상 변화
정현숙(Hyeon Sook Cheong),송규상(Kyu Sang Song),박진수(Gene Su Park),김성준(Sung Jun Kim),양영기(Young Ki Yang),표병식(Byoung Sik Pyo),황백(Baik Hwang),강영희(Young Hee Kang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.1
The microtuber was efficiently formed on SH medium containing 9% sucrose from the in vitro propagated shoot of potato (Solanum tuberosum cv. Sumi). In order to investigate gene expression depending on the developmental stage of microtuber, we examined the changes of peroxidase and esterase activities, and their isozyme patterns as well. Peroxidase and esterase activities were the highest at the 7 day-culture of the microtuber and subsequently decreased on the stage of microtuberization, whereas esterase activity increased at the stage of 60 day-culture. However, their activities in the ordinary tuber were higher than those of 60 day-cultured microtuber. In addition, in the peroxidase isozyme pattern two new bands of pI 7.05 and pI 4.65 were appeared at the 15- day and 60 day-cultures, respectively, as shown by isoelectric focusing. Various bands in the esterase isozyme pattern were shown at the 7 day-culture, and the band patterns were a large difference, comparing those of shoot and tuber. New bands in the esterase isozyme pattern also appeared at the 15 day- (pI 4.52) and 60 day-cultures (pI 4.48). These results suggest that the changes of peroxidase and esterase activities and isozyme patterns are an important factor in the differentiation and development of potato.
Preparation of Pullulan-g-Poly(L-lysine) and It’s Evaluation as a Gene Carrier
박진수,나재운,박준규,남정표,김원석,최창용,김명렬,장미경 한국고분자학회 2012 Macromolecular Research Vol.20 No.7
In this study, polypeptide/polysaccharide graft copolymers pullulan-g-poly(L-lysine) (PULPLL) was prepared through the ring opening polymerization of ε-benzoxycarbonyl L-lysine N-carboxyanhydrides (Z-L-lysine NCA) in the presence of pullulan. The PULPLL copolymer nanoparticles, which are prepared by the diafiltration method, were investigated by using Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectra (1H NMR), dynamic light scattering (DLS), transmission electron microscope (TEM), and fluorescence spectroscopy. The PULPLL copolymers formed self-aggregated nanoparticles in the aqueous milieu. The physicochemical characterization revealed that the nanoparticle size ranged between 60 and 500 nanometers, and the critical aggregation concentration (CAC) is 0.001~0.1 g/L, depending on the degree of substitution. With negligible cytotoxicity and higher transfection efficiency, PULPLL nanoparticles may be safe gene carriers.
약물 및 유전자 전달체로 응용하기 위한 Poly(L-Lysine)이 결합된 O-Carboxymethyl Chitosan PEG의 제조와 특성
남정표 ( Joung Pyo Nam ),김영민 ( Young Min Kim ),박진수 ( Jin Su Park ),이응재 ( Eung Jae Lee ),최창용 ( Chang Yong Choi ),장미경 ( Mi Kyeong Jang ),나재운 ( Jae Woon Nah ) 한국공업화학회 2010 공업화학 Vol.21 No.6
키토산의 응용성을 높이기 위해 제조된 O-carboxymethyl water soluble chitosan (OCMCh)의 구조에 인체 내 순환시간을 증가시키기 위하여 PEG를 도입하였으며, 약물 및 유전자 전달제로 응용하기 위하여 PEG가 결합된 OCMCh-PEG를 Poly(L-Lysine) (PLL)과 이온복합체를 형성함으로써 OCMCh-PEG-PLL를 제조하였다. 제조된 OCMCh-PEG-PLL의 물리 화학적특성은 적외선 분광광도계와 핵자기공명장치를 이용하여 분석하였으며, 성공적으로 PLL이 결합되었음을 확인 하였다. 또한 동적광산란장치와 투과전자현미경을 통하여 PLL의 양을 고정하였을 때, PEG의 양이 중가함에 따라 입 자의 크기가 감소하는 것을 볼 수 있었으며, 구형의 업자형태를 가지는 것을 확인할 수 있었다. 이상의 결과는 OCMCh-PEG-PLL이 약물 및 유전자 전달체 등과 같은 생체재료로의 응용 가능성을 가지는 것을 볼 수 있다. O-carboxymethyl water-soluble chitosan (OCMCh) prepared for enhance the application of chitosan was modified with mthoxy polyethyleneglycol (mPEG) by ion-complex for long circulation in the blood. OCMCh-PEG-PLLs was prepared by forming ion-complex with OCMCh-PEG and Poly(L-Lysine) (PLL) for drug and gene delivery system. The physicochemcal characterisitcs of OCMCh-PEG-PLLs were investigated by FT-IR, (1)H-NMR. These results showed that CMCh-PEG-PLLs were successfully syntehsized by ion-complex. Particle size distribution and zeta potential of the OCMCh-PEG-PLLs were determined using dynamic light scattering technique. Transmission electron microscopy (TEM) was also used to observe the morphology of the OCMCh-PEG-PLLs. OCMCh-PEG-PLLs have spherical shapes with particle size 290~390 nm. OCMCh-PEC-PLLs were showed when the feeding amount of mPEG ratio was increased, particle size and zeta potential were decreased. Based on these results, it is possible to introduction of the OCMCh-PEG-PLLs into various biomedical fields such as drug and gene delivery system.