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Tyrosine 전환 반응에서의 Tyrosinase 의 안정성 및 반응특성
김지현,유영제 ( Ji Hyeon Kim,Young Je Yoo ) 생화학분자생물학회 1990 BMB Reports Vol.23 No.4
Tyrosinase has two types of enzymatic activities; cresolase catalyzing the hydroxylation of momophenol and catecholase catalyzing the oxidation of o-diphenol. Biotransformation kinetics of tyrosinase were investigated using L-tyrosine as a substrate. The rate of L-DOPA tansformation by catecholase was faster than the rate of L-tyrosine transformation by cresolase and the rate-limiting step was thus the hydroxylation by cresolase. The kintics of L- DOPA transformation by tyrosinase followed Michaelis-Menten type equation, while the kinetics of I; tyrosine transformation by tyrosinase followed Michaelis-Menten type apparently. However, the kinetics of L-tyrosine transformation was nearly independent on the initial substrate concentration, possibly due to the competitive inhibition of L-tyrosine on the catecholase. It was also observed that cresolase was more unstable than catecholase.
생물반응기를 이용한 Linear alkylbenzene sulfonate ( LAS ) 와 중간 생성물 Sulfophenylalkanoates ( SPA ) 의 제거
이인구,김지현,유영제,김화용 ( In Ku Lee,Ji Hyeon Kim,Young Je Yoo,Hwa Yong Kim ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.6
A fluidized-bed bioreactor was used to treat the industrial wastewater containing linear alkylbenzene sulfonate(LAS). Microorganism obtained by acclimation showed low growth rate and substrate inhibition at relatively high substrate concentration. It was found from the experiment using fluidized-bed bioreactor that 64 ㎛-thick biofilm was made after 15 days. The 93.4% LAS removal efficiency in the reactor was obtained at 120 ㎎/L of initial LAS concentration, while the removal efficiency of sulfophenylalkanoates(SPA) which is a representative intermediate of biodegradation of LAS was 60-88% depending on the initial concentration of LAS. When sodium benzoate was added to the second reactor, the remaining SPA became lowered by 40% compared to the control experiment. And when activated carbon was added to the reactor, the removal efficiency of SPA was 96.2% and that of LAS was 100% when initial inflowing concentration of LAS was 350 ㎎/L.
양대창(Dae Chang Yang),김지현(Ji Hyeon Kim),유영제(Young Je Yoo) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
This study was performed to improve the biofilm formation on the plastic support(PVC) through chemical modification of its surface. The method using chlorosulfonic acid and PEI(polyethylenimine) showed 2-5 times higher attached biomass than the results obtained with other treatments. In this test, the amount of attached dry cell weight was 2.5g/㎡, while that from the untreated support was negligible. Effects of several factors such as PEI concentration, suspended cell mass. substrate concentration on the biofilm formation were investigated. It was confirmed that the time required for the biofilm formation on the new plastic support could be shortened 2-3 times compared to that of conventional systems.