http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이승연,변현재,최희락,원종인,한정훈,박성수,김동현,성종환 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.2
Gut microbiota dysbiosis and intestinal epithelial cell barrier dysfunction are associated with diseases such as inflammatory bowel disease and type 2 diabetes. To study the interaction of gut microbes and intestinal epithelial cells, in vitro model systems for co-culturing intestinal cells and gut microbes are essential. Since most gut microorganisms are anaerobic bacteria, it is difficult to co-culture microbes with intestinal epithelial cells that require oxygen during culture. We have developed a novel gut microbialepithelial cell (GMEC) co-culture system, a microfluidic chip in an anaerobic chamber with oxygen gradient within the chip. Appropriate co-culture flow rates were determined based on the experimental observation as well as fluid dynamics and molecular transport simulations. Using GMEC system, Escherichia coli and Lactobacillus plantarum were co-cultured with gut epithelial cell line, Caco-2. We expect that our GMEC co-culture system can potentially be a useful platform for studying the interaction between intestinal epithelial cells and gut microbes.
김종향,변종환 한국물환경학회 2000 한국물환경학회지 Vol.16 No.2
Reactive dyestuffs (Red 195, Yellow 145, Blue 19) and Disperse dyestuffs (Red 60, Yellow 54. Blue 56) were photodegraded by UV irradiation with or without photocatalyst, TiO₂ powder. The photoreaction were conducted in a quartz annular reactor equipped with 39 w (x2) mercury lamp. The extent of decolorization and removal of organic compounds were 92%, 60% for Red 195 in reactive dyestuff with UV irradiation and were 98%, 99% for Red 195 in reactive dyestuff with UV irradiation and TiO₂ powder, respectively. The extent of decolorization and removal of organic compounds were 7%, 52% for Red 60 in disperse dyestuff with UV irradiation and were 96%, 94% for Red 60 in disperse dyestuff with UV irradiation and TiO₂ powder, respectively. These results were measured UV-Vis spectrophotometry and colors were calculated by platinum-cobalt standard method.
최형섭,조인철,변종환,문병현,허종수 한국환경농학회 2003 한국환경농학회지 Vol.22 No.1
호수 유입 하천인 황강의 1996~2001년 년도별 평균 수질은 COD 3.1~4,2 mg/L, T-N 2.460~3.550 mg/L, T-P 0.111~0.201 mg/L이였다. 호수내의 평균 수질은 COD가 1996년 1.9 mg/L에서 2001년 2.7 mg/L로 매년 조금씩 종가하는 것으로 나타났다. 호수내의 1996~2001년 년도별 평균 T-N 농도는 1.393~l.792 mg/L 이었으며, T-P농도는 0.018~0.023 mg/L 이였다. 식물성 플랑크톤의 발생 정도를 나타내는 Chl-α와 T-N, T-P와의 상관계수는 각각 0,382, 0.372였으며, 또한 수온과 강우량에 대한 상관계수는 각각 0.589, 0,526이였다. 따라서 합천댐의 경우 식물성 플랑크톤의 발생이 T-N, T-P보다 수온 및 강수량과 더 밀접한 관계가 있는 것으로 나타났다. 그리고 호수의 영양단계는 중영양~부영양 단계에 있는 것으로 평가되었다. The yearly average water qualifies of the Whang river, which flows into the Hapcheon lake, were COD 3.1~4.2 mg/L, T-N 2.460~3.550 mg/L, and T-P 0.111~0.201 mg/L during 1996~2001. The yearly average COD concentration of Hapcheon lake was increased from 1.9 mg/L (in 1996) to 2.7 mg/L (in 2000). However, T-N and T-P concentration of Hapcheon lake did not show increasing trend over the 6 year period. During 1996~2001, the yearly average concentrations of T-N, T-P were 1.383?1.792 mg/L, 0.018~0.023 mg/L, respectively. The correlation coefficients between chlorophyll α and T-N, T-P, rainfall intensity, water temperature were 0.382, 0372, 0.589, and 0.526, respectively. Therefore, the rainfall and water temperature appeared to play an important role for the variations of chlorophyll α concentration in the Hapcheon lake. Trophic state of the Hapcheon lake were evaluated to be in the range of mesotrophic to eutrophic.