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조경화 ( Kyung Hwa Jo ),류근준 ( Geun Jun Lyu ),김응수 ( Eung Su Kim ) 한국센서학회 2011 센서학회지 Vol.20 No.1
We developed a small methane detection system because methane gas is used in many areas and is dangerous. The developed system consisted of LD(Laser Diode) tuned a wavelength of 1.65 ㎛, two mirrors to collect a laser beam, photo detector. It could detect methane gas at a long range and its sensitivity was 1.98 V/CH4 %.
영양분이 결핍된 H460 세포주에서 자가포식이 세포사멸에 미치는 영향
장혜연 ( Hye Yeon Jang ),조향정 ( Hyang Jeong Jo ),황기은 ( Ki Eun Hwhang ),김소영 ( So Young Kim ),이강규 ( Kang Kyoo Lee ),문성록 ( Sun Rock Moon ),신정현 ( Jeong Hyun Shin ),조경화 ( Kyung Hwa Cho ),이미경 ( Mi Kung Lee ),이삼 대한결핵 및 호흡기학회 2010 Tuberculosis and Respiratory Diseases Vol.69 No.2
Background: Autophagy is an important adaptive mechanism in normal development and in response to changing environmental stimuli in cancer. Previous papers have reported that different types of cancer underwent autophagy to obtain amino acids as energy source of dying cells in nutrient-deprived conditions. However, whether or not autophagy in the process of lung cancer causes death or survival is controversial. Therefore in this study, we investigated whether nutrient deprivation induces autophagy in human H460 lung cancer cells. Methods: H460, lung cancer cells were incubated in RPMI 1640 medium, and the starved media, which are BME and RPMI media without serum, including 2-deoxyl-D-glucose according to time dependence. To evaluate the viability and find out the mechanism of cell death under nutrient-deprived conditions, the MTT assay and flow cytometry were done and analyzed the apoptotic and autophagic related proteins. It is also measured the development of acidic vascular organelles by acridine orange. Results: The nutrient-deprived cancer cell is relatively sensitive to cell death rather than normal nutrition. Massive cytoplasmic vacuolization was seen under nutrient-deprived conditions. Autophagic vacuoles were visible at approximately 12 h and as time ran out, vacuoles became larger and denser with the increasing number of vacuoles. In addition, the proportion of acridine orange stain-positive cells increased according to time dependence. Localization of GFP-LC3 in cytoplasm and expression of LC-3II and Beclin 1 were increased according to time dependence on nutrient-deprived cells. Conclusion: Nutrient deprivation induces cell death through autophagy in H460 lung cancer cells.