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생쥐 뇌조직에서 부분정제한 Phosphatidylinositol - Specific Phospholipase C Ⅰ과 Ⅱ의 특성
이종호,황재택,김명년,이영식,조기승 ( J . H . Lee,J . T . Hwang,M . N . Kim,Y . S . Lee,K . S . Cho ) 생화학분자생물학회 1991 BMB Reports Vol.24 No.3
Two forms of phosphatidylinositol-specific phospholipase C (PLC-I and PLC-II) were partially purified from mouse brain cytosolic fraction. These enzymes showed optimum pH 5.0 with PI and pH 5.2 with PIP₂ as substrates, respectively. The enzymatic hydrolysis of PI by both isozymes at pH 5.0 and pH 7.2 showed significant increase with increased concentration of Ca^(2+). On the other hand, the hydrolysis of PIP₂ by PLC-I and PLC-II at both pH exhibited the maximum activity in the presence of 0.5 mM and 0.2 mM Ca^(2+), respectively, while inhibited significantly by increasing the concentration of Ca^(2+). Especially without Ca^(2+) at pH 7.2, PIP₂ hydrolysis by PLC-I and PLC-II represented 15 and 4 times higher than those of PI substrate, respectively. From these results, it could be concluded that PIP₂ hydrolysis Ca^(2+) -independent under the same conditions. In the effect of nucleotides on PI hydrolysis at pH 5.0, ATP and GTP inhibited the enzyme activity of both enzymes, but PIP₂ hydrolysis at physiological pH 7.2 by PLC-I and PLC-II enhenced significantly without Ca^(2+). At this condition, 1 mM Ca^(2+) showed no effect at all on the enzyme activity. The results of complete inhibition of the enzyme activity by Ag^+ and Hg^(2+) suggested that -SH group was involved in the active site of both isozymes.
이종호,오한준,장재명,지충수,Lee, J.H.,Oh, H.J.,Jang, J.M.,Chi, C.S. 한국분석과학회 2001 분석과학 Vol.14 No.1
광촉매 특성을 지닌 $TiO_2$ 피막을 인가 전압 180 V에서 양극산화법을 이용하여 제조하고, 산화조건에 따른 구조적 차이에 대하여 조사하였다. 황산 및 황산+과산화수소 용액의 경우 $TiO_2$의 구조가 rutile과 anatase형이 혼합된 형태를 지녔으나, 황산+인산 및 황산+인산+과산화수소 혼합용액의 경우에는 대부분 anatase형의 $TiO_2$가 제조되었음을 알 수 있었다. 양극산화법에 의해 제조된 $TiO_2$는 모두 광촉매 특성율을 나타냈으며, 아닐린 블루 분해 반응의 경우 모든 산화 조건에서 반응차수가 1로 나타났으며 속도상수값이 거의 유사함을 알 수 있었다. Photocatalytic $TiO_2$ films were prepared by anodic oxidation at 180 V and their structural difference caused by oxidation conditions was studies. The microstructure of $TiO_2$ films in $H_2SO_4$ and $H_2SO_4/H_2O_2$ solution was mixed type of rutile and anatase. However, the $TiO_2$ layer formed in $H_2SO_4/H_3PO_4$ and $H_2SO_4/H_3PO_4/H_2O_2$ mixture was mostly anatase type. All $TiO_2$ films prepared by anodic oxidation exhibited photocatalytic properties. The photocatalytic degradation of aniline blue was first order reaction with similar rate constants at all oxidative conditions examined in this work.
곡물(穀物)의 공기선별(空氣選別)에 관(關)한 공기동력학적(空氣動力學的) 연구(硏究)(I) -수직풍동(垂直風胴)의 설계(設計)에 관(關)한 실험적(實驗的) 연구(硏究)-
이종호,조용진,김만수,Lee, C.H.,Cho, Y.J.,Kim, M.S. 한국농업기계학회 1989 바이오시스템공학 Vol.14 No.4
It is desirable for the vertical wind tunnel which can build uniform air flow across the vertical duct to be used for the purpose of the investigation of the aerodynamic properties of grains. This study was conducted to examine how the air velocity profile in the vertical duct is influenced by the various alternations of the elements of the wind tunnel, and to prepare design guidance of the vertical wind tunnel which can be used for investigating aerodynamic properties of grains. In addition, several tests were conducted to locate the test section which can be applicable for determining the terminal velocity of grain. The following conclusions were obtained from the study: 1. The size and the location of the outlet of the plenum chamber should be determined such that the outlet air flow is less affected by the air flow and the back pressure by the side wall of the chamber. 2. The honeycomb was not helpful for attaining uniform air flow in case that the air flow profile at the bottom of the vertical duct is serverely different from the ideal one. 3. Even though considerable pressure drop was resulted from the screens installed within the vertical duct, the screens were helpful for attaining uniform air flow in the duct. 4. It is desirable for the test section to be located at the position that not only the air flow of the duct is not disturbed by the distorted back pressure in the plenum chamber, but also less boundary layer is developed.
곡물(穀物)의 공기선별(空氣選別)에 관(關)한 공기동력학적(空氣動力學的) 연구(硏究)(II) -수직풍동(垂直風銅)을 이용(利用)한 곡물(穀物)의 종말속도(終末速度) 측정(測定)-
이종호,조용진,김만수,Lee, C.H.,Cho, Y.J.,Kim, M.S. 한국농업기계학회 1990 바이오시스템공학 Vol.15 No.1
Aerodynamic property is the most important factor in designing the pneumatic separator and handling equipment for grains and seeds. Particularly the correct information about the terminal velocities of the corresponding grains and seeds is indispensible. However, a few studies with relation to the terminal velocities of grains and seeds were conducted in this country, even though the terminal velocities of the domestic grains and seeds are required to design those equiments which can be used for the domestic grains and seeds having specific aerodynamic properties. In this study, the terminal velocities for four varieties of varley and six varieties of paddy were investigated by means of two different methods, the suspension method and the drop method in an upward current of air. For measuring the terminal velocities, the vertical wind tunnel which had been examined about the uniform air flow in the previous study was used. In addition, the effect of the size of grains and the moisture content of grain kernel on the terminal velocity was examined. The following conclusions were derived from the study : 1. The different terminal velocities of grains are resulted from the different measuring methods. The terminal velocity measured by the drop method is smaller than that by the suspension method. It is considered that the difference in the terminal velocities is caused by the difference in the projection area of grain which is faced to the air stream. 2. The terminal velocity of grain increases as the size and the moisture content of the kernel increase. 3. The linear regression equations for the terminal velocities of grains were derived in terms of the moisture content of grains by the variety of grains and the measuring method. Also, the linear regression equations for the terminal velocity, based on the weighted size of grains, were derived in terms of the moisture contents of granis.