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만경강 지류에 서식하는 Unio Douglasiae 의 중금속 함량에 관한 조사연구
유일수,김환홍 ( Il Sou Yoo,Hwan Hong Kim ) 한국하천호수학회 1991 생태와 환경 Vol.24 No.2
For this survey, Unio douglasiae was collected from six station in Mangyung River from October 1987 to October 1990. The contents of Cd, Pb, Cr, Cu and Zn in edible portion of Unio douglasiae were analyzed. The results obtained are as follows; The contents of heavy metals in Unio douglasiae shoued in the range of 0.03∼0.34 ppm for Cd, 0.18∼1.69 ppm for Pb, 0.04∼0.38 ppm for Cr, 0.38∼1.24 ppm for Cu, 1.94∼3.24 ppm for Zn. As a whole, contents of heavy metals contained in Unio douglasiae from the lower course of the Jeon Ju Chon were larger than those from the upper course. But those was little difference between the contents of heavy metal at E site and F site.
FFS 모드의 공통전극과 화소전극 사이의 절연층 두께에 따른 전기광학 특성
정준호,하경수,임영진,유일수,정연학,유재진,김경현,이승희,Jung, Jun-Ho,Ha, Kyung-Su,Lim, Young-Jin,Yoo, Il-Sou,Jeong, Yeon-Hak,Lyu, Jae-Jin,Kim, Kyeong-Hyeon,Lee, Seung-Hee 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
We have studied electro-optic characteristics as a function of passivation thickness existing between common electrode and pixel electrodes in the fringe-field switching (FFS) mode using the LC with positive dielectric anisotropy. A steep increase in the transmission is observed with increase in the passivation layer from $0.29{\mu}m$ to $1.09{\mu}m$ and thereafter it almost saturates over the $1.09{\mu}m$ of passivation layer. This saturation is mainly associated with correlation between transmittance at the center region of pixel electrode and at the center region between pixel electrodes. From the results, optimal thickness of passivation layer can be defined.
구태규 ( Tae Kyu Ku ),유일수 ( Il Sou Yoo ),박안나 ( An Na Park ) 한국미용학회 2014 한국미용학회지 Vol.20 No.5
In this study was to examine the applicability of mango (MangiferaindicaL.) leaf extract to cosmetics a composition based on its antioxidant activity. Extracted with ethanol and water to obtain a 50% concentration of mango leaf extract (0.4, 2, 10, 50 mg/ml) as mango leaf collected in Jeju Island, Korea. In 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical assay, lower concentrations of mango leaf extract resulted in a dose-dependent increase in antioxidant activity compared to the synthetic antioxidant butylated hydroxytoluene (BHT). Total polyphenol and flavonoid contents were highest in the 50 mg/mL mango leaf extract. Cell viability and cytotoxicity were assessed in RAW 264.7 cells by ROS production, macrophages were exposed to various concentrations (10, 25, and 50 μL) of mango leaf extract. Reduced DCF fluorescence intensities indicating stronger antioxidant activities were observed in a mango leaf extract concentration-dependent manner. Nitrite scavenging activity also increased with higher concentrations of mango leaf extract, thus demonstrating the ability of mango leaf extract to inhibit nitrosamine production. Based on these results, mango leaves have excellent antioxidant activity and are safe to be incorporated and used as a component of cosmetics a composition.
염산 트라마돌을 함유하는 PLGA 미립구의 제조 및 방출거동
박종학 ( Jong Hak Park ),엄신 ( Shin Eom ),안식일 ( Sik Il Ahn ),김대성 ( Dae Sung Kim ),김원 ( Won Kim ),이동원 ( Dong Won Lee ),유일수 ( Il Sou Yoo ),이종문 ( John M Rhee ),강길선 ( Gil Son Khang ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
Tramadol HCl(TH)-loaded poly(L-lactide-co-glycolide)(PLGA) microspheres were prepared by O/O solvent evaporation method for sustained release. We investigated the release behavior according to PLGA molecular weight and concentration. TH-loaded PLGA microspheres were characterized on the surface and cross-section morphology by SEM. TH-loaded PLGA microspheres had smooth surfaces and various pores in internal structure. As the PLGA molecular weight and PLGA concentration increased, the release rate of TH decreased. The behaviors of degradation was decreased according to increased PLGA molecular weight. These results showed that the release behaviors can be controlled by various of molecular weight and concentration of PLGA.
실크 피브로인/젤라틴 하이브리드 지지체의 제조 및 특성분석
김혜린(Hye Lin Kim),홍민성(Min Sung Hong),김수진(Su Jin Kim),조한수(Han Su Jo),유일수(Il Sou Yoo),이동원(Dong Won Lee),강길선(Gil Son Khang) 한국고분자학회 2011 폴리머 Vol.35 No.5
실크 피브로인은 생체적합성과 비독성 및 비면역 특성을 갖는 생분해성 천연고분자로서, 콜라겐의 가수분해로부터 유래되는 천연물질인 젤라틴을 이용하여 실크 피브로인/젤라틴 지지체를 제조하였다. 지지체의 최적화 조건을 찾기 위하여 실크 피브로인의 양과 젤라틴 및 글루타알데히드의 농도를 다르게 하여 제조하였다. 실크 피브로인/젤라틴 지지체는 SEM과 DSC 및 수분흡수성 평가를 통해 특성분석을 하였으며 세포생존율 및 증식률은 WST 방법을 통해 평가되었다. 이 결과 실크 피브로인 0.3 g 지지체에 8% 젤라틴 및 1% 글루타알데히드를 함유한 지지체에서 세포 부착 및 증식을 위해 가장 적합한 특성을 제공한다고 제안되었다. 결과적으로, 실크 피브로인/젤라틴 지지체는 잠재적인 세포 전달체 및 조직공학을 위한 구조 기반역할을 할 수 있을 것으로 사료된다. Silk fibroin is a biocompatible and slowly biodegradable natural polymer. This natural polymer has excellent mechanical properties, non-toxicity, and non-immunogenic properties and has been demonstrated to support tissue regeneration. Also, gelatin is a natural material derived from collagen by hydrolysis and has an almost identical composition as that of collagen. Silk fibroin/gelatin scaffolds have been fabricated by using the freeze-drying method. To establish the scaffold manufacturing condition for silk fibroin and gelatin, we made scaffolds with various compositions of gelatin, glutaldehyde and silk fibroin. The silk fibroin/gelatin scaffolds were characterized using SEM, DSC, and water absorption ability tests. The cellular proliferation was evaluated by WST assay. These results suggested that a scaffold containing 8% of gelatin, 1% of glutaldehyde and 0.3 g of silk fibroin provided suitable characterstics for cell adhesion and proliferation. In conclusion, the silk fibroin/gelatin scaffold may serve as a potential cell delivery vehicle and a structural basis for tissue engineering.
수용성 고분자에 따른 실로스타졸 고체분산체의 특성화 및 조절된 방출거동
박종학 ( Jong Hak Park ),김세호 ( Se Ho Kim ),오재민 ( Jae Min Oh ),안식일 ( Sik Il Ahn ),김윤태 ( Yun Tae Kim ),정수현 ( Su Hyun Jung ),최진희 ( Jin Hee Choi ),이동원 ( Dong Won Lee ),유일수 ( Il Sou Yoo ),이종문 ( John M Rhee ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
The aim of this study was to improve dissolution rate and controlled release of poorly water-soluble drug, cilostazol, using general water soluble polymers. We prepared solid dispersed cilostazol with hydrophilic polymer, Poly-N-Vinylpyrolidone(PVP), Plasdone S630, Hydroxypropylmethylcellulose(HPMC), PEG 6000, Eudragit E100, and surfactant, Poloxamer 407. Characterization of cilostazol solid dispersion analyzed by scanning electron microscope(SEM), differential scanning calorimeter(DSC) and infrared spectrometry(FT-IR). SEM and DSC were found that amorphous in solid dispersion. Particle size analyzer was used to investigate size of cilostazol in solid dispersion. The in vitro release behavior of solid dispersion presented at simulated gastric fluid(pH 1.2). The release behavior of cilostazol was controlled release with hydrophilic polymers and solid dispersed cilostazol with hydrophilic polymers was sustained release behavior than initial burst release of commercial drug(Pletal(R)). This studies suggest that this solid dispersion system with hydrophilic polymers controlled poorly water-soluble drug, cilostazol, release behaviors.
슈반세포와 골수간엽줄기세포의 공배양이 골수간엽줄기세포의 분화와 증식에 미치는 영향(2)
김초민 ( Cho Min Kim ),김순희 ( Soon Hee Kim ),송이슬 ( Yi Seul Song ),정수현 ( Su Hyun Jung ),박종학 ( Jong Hak Park ),오재민 ( Jae Min Oh ),이동원 ( Dong Won Lee ),유일수 ( Il Sou Yoo ),이종문 ( John M Rhee ),강길선 ( Gil Son Kh 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
Schwann cell(SC) play an important role as they are the source of different trophic substances and present a great neurotrophic activity. Bone marrow stromal cells(BMSCs) contain mesenchymal stem cell and progenitor cells. BMSCs can differentiate into various cell types, including muscle and brain cell. The aim of this study is to investigate the differentiation of BMSCs through co-culture system with SCs. Pure SCs and BMSCs were cultured as control group. Expression of GFAP, P75 and NF were determined by immunocytochemical staining and reverse transcriptase polymer chain reaction(RT-PCR) was conducted to confirm mRNA expression of NF and NSE in BMSCs co-cultured with SCs. Following co-culture time with SCs, BMSCs underwent morphological changes similar to those of cultured SCs and stained positively for GFAP, P75 and NF protein. Electrophoresis analysis revealed that the levels of NF and NSE on BMSC co-cultured with SCs related with other group maintained up to 21 days. Our results showed that BMSCs able to differentiate into SC-like cells using co-culture system in vitro. These findings could be helpful for the development of the cell-based therapeutic strategies for CNS repair.