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In vitro 동물세포에서 GGEx18의 ethyl acetate 분획물에 의한 지방산 B-산화효소 유전자 발현의 조절
주병수 ( Byung Soo Joo ),이희영 ( Hee Young Lee ),이혜림 ( Hye Rim Lee ),윤미정 ( Mi Chung Yoon ),서부일 ( Bu Il Seo ),김범회 ( Beom Hoi Kim ),신순식 ( Soon Shik Shin ) 대한본초학회 2012 大韓本草學會誌 Vol.27 No.2
Objectives:This study was undertaken to investigate the effects of the GGEx18 ethyl acetate fraction (EF) on lipid accumulation and gene expression of fatty acid-oxidizing enzymes using 3T3-L1 adipocytes, C2C12 skeletal muscle cells, and NMu2Li liver cells. Methods:PPARa, AMPK and UCPs transactivation was examined in NMu2Li hepatocytes, C2C12 myocytes, and 3T3-L1 preadipocytes using transient transfection assays. Results: 1. Compared with control, EF significantly increased the mRNA expression of VLCAD in 3T3-L1 adipocytes. 2. Compared with control, EF (0.1 ug/ml) significantly inhibited lipid accumulation in 3T3-L1 adipocytes. 3. EF significantly increased the mRNA expression of AMPKa1, AMPKa2 and PPARa in C2C12 skeletal muscle cells compared with control. 4. EF significantly increased the mRNA expression of genes involved in fatty acid b-oxidation, such as thiolase, MCAD, and CPT-1 in C2C12 skeletal muscle cells compared with control. 5. EF significantly increased the mRNA expression of UCP2 involved in energy expenditure in C2C12 skeletal muscle cells compared with control. 6. Compared with control, EF (10 ug/ml) significantly inhibited lipid accumulation in C2C12 skeletal muscle cells. 7. EF (10 ug/ml) significantly increased the mRNA expression of ACOX, HD, VLCAD and MCAD in NMu2Li liver cells compared with control. Conclusions:These results suggest that EF may prevent obesity by increasing the mRNA expression of mitochondrial fatty acid b-oxidizing enzymes in 3T3-L1 adipocytes, by not only regulating the fatty acid oxidation through activation of AMPK and PPARa, but also increasing the UCP2 mRNA expression in C2C12 skeletal muscle cells, and by stimulating the mRNA expression of fatty acid-oxidizing enzymes in NMu2Li liver cells.
전도성 고분자 센서 어레이를 이용한 휘발성 유기 화합물 가스 인식
이경문(Kyung Mun Lee),주병수(Byung Su Joo),유준부(Joon Boo Yu),황하룡(Ha Ryong Hwang),이병수(Byung Soo Lee),이덕동(Duk Dong Lee),변형기(Hyung Gi Byun),허증수(Jeung Soo Huh) 한국센서학회 2002 센서학회지 Vol.11 No.5
We fabricated gas recognition system using conducting polymer sensor array for recognizing and analyzing VOCs(Volatile Organic Compounds) gases. The polypyrrole and polyaniline thin film sensors which were made by chemical polymerization were employed to detect VOCs. The multi-dimensional sensor signals obtained from the sensor array were analyzed using PCA(principal component analysis) technique and RBF(radial basis function) Network. Throughout the experimental trails, we confirmed that RBF Network is effective than PCA technique in identifying VOCs.
최낙진(Nak Jin Choi),심창현(Chang Hyun Shim),송갑득(Gap Duk Song),주병수(Byung Su Joo),이윤수(Yun Su Lee),이상문(Sang Moon Lee),이덕동(Duk Dong Lee),허증수(Jeung Soo Huh) 한국센서학회 2002 센서학회지 Vol.11 No.5
Two SnO_2 based sensing films(pure SnO_2 and SnO_2/Pt) and a Pt thin film for temperature sensor on an alumina substrate were designed and fabricated for classifying the indoor environmental gases. By controlling the heating power in the shape of trapezoid, unique four sensing response curves created from both SnO_2 film and SnO_2/Pt film. Then, various parameters were extracted from sensing response curves and carried out principal component analysis(PCA). The results confirm that a sensor array with the proposed operating mode was extremely effective in classifying indoor environmental gases such as CO_2, C_3H_8, C_4H_10.
이윤수 ( Yun Su Lee ),송갑득 ( Kap Duk Song ),주병수 ( Byung Su Joo ),이상문 ( Sang Mun Lee ),최낙진 ( Nak Jin Choi ),이덕동 ( Duk Dong Lee ),허증수 ( Jeung Soo Huh ) 한국센서학회 2004 센서학회지 Vol.13 No.2
Optical fiber sensors have been used to detect small amounts of chemical species. In this work, a new thin polymer-clad fiber sensor is developed. Polyaniline is chemically synthesized and thin clad layers of the polymer are easily deposited on optical fiber by dip-coating technique. The optical property of polyaniline as a sensing material is analyzed by UV-Ms-NIR. The light source is stabilized He-Ne laser at635 nm wavelength with 1 mW power. The light power transmitted through the optical fiber is measured with a spectrophotometer. By selecting a fixed incident angle, variation of transmitted light intensity through the optical fiber can be detected as gas molecules absorbed in the polyaniline clad layer. Among the various gases, the fabricated optical fiber sensor shows good sensitivity to NH3 gas. The optical fiber sensors was shown more improved properties than polymer based sensors which measure conductivity changes.
최낙진 ( Nak Jin Choi ),반태현 ( Tae Hyun Ban ),곽준혁 ( Jun Hyuk Kwak ),임연태 ( Yeon Tae Lim ),주병수 ( Byung Su Joo ),김재창 ( Jae Chang Kim ),허증수 ( Jeung Soo Huh ),이덕동 ( Duk Dong Lee ) 한국센서학회 2004 센서학회지 Vol.13 No.3
Thin film gas sensor based on tin oxide was fabricated and its characteristics were examined: Target gas is acetonitrile (CH₃CN) that is simulant gas of blood agent gas. Sensing materials are SnO₂, SnO₂/Pt, and (Sn/Pt)oxidation with thickness from 1000 Å to 3000 Å. Sensor was consisted of sensing electrode with interdigit (IDT) type in front side and a heater in back side. Its dimension was 7 x 10 x 0.6 mm². Fabricated sensor was measured as flow type and monitored real time using PC. The optimal sensing material for CH₃CN was {Sn(3000 Å)/Pt(30 Å)}oxidation and its sensitivity and operating temperature were 30%, 300℃ in CH₃CN₃ ppm.
MEMS 및 센서 시스템 : 단일전극을 가진 마이크로 가스센서의 제작 및 특성
송갑득 ( Kap Duk Song ),박영일 ( Yeung Il Bang ),이상문 ( Sang Mun Lee ),이윤수 ( Yun Su Lee ),최낙진 ( Nak Jin Choi ),주병수 ( Byung Su Joo ),서무교 ( Moo Gyo Seo ),허증수 ( Jeung Soo Huh ),이덕동 ( Duk Dong Lee ) 한국센서학회 2002 센서학회지 Vol.11 No.6
Micro gas sensor with single electrode was proposed for improving stability and sensitivity, Generally, metal oxide gas sensors have two electrodes for heating and sensing. This fabricated new type sensor have only a single electrode by forming a sensing material onto heating electrode. Pt as a heating and sensing electrode was sputtered on glass and a SnO_2 sensing material was thermally evaporated on Pt electrode. SnO_2 was patterned by lift-off process and then thermally oxidized in O_2 condition for 1 hr., 600 ℃. The size fabricated sensor was 1.9 x 2.1 mm^2. As a result of CO gas sensing characteristics, this sensor showed 100 mV change for 1,000 ppm and linearlity for wide range(0 ~ 10,000 ppm) of gas concentrations. And the sensor shows a good recovery characteristics of 1 % deviation compared to initial resistance.
위장 속 냄새분별을 위한 membrane 제작 및 모니터링 시스템 개발
이덕동,허증수,이윤수,주병수,임채근,김병태 경북대학교 전자기술연구소 2001 電子技術硏究誌 Vol.22 No.2
In present, prevention and early detection of the disease are the most important and effective strategies for human health. Stomach cancer respectively produce a aceton odor and ammonia odor. Accordingly, quantitative and qualitative analysis of odor can be a effective means for early diagnosis and detection of diseases. To get a reliable electronic nose system, the sensor array consisted of conducting polymer materials as the base material, which were synthesized by chemical and electrochemical polymerization method using monomer(pyrrole, aniline, thiophene) and some dopants on a substrate with comb type electrode. They have good selectivity and sensitivity for various odorss. The microstructure of sensing materials was analyzed using UV-Vis-NIR and SPM. Each sensor has been characterized by electrical measurements for odors in a various concentration range.