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Novel Methylation Biomarker for Non-invasive Diagnostics in Lung Cancer
오태정,( Chang Hun Lee2 ),( Min Ki Lee ),( Yeul Hong Kim ),( Sang Yull Lee ),( Hyo Sung Jeon ),( Shin Yup Lee ),( Seung Soo Yoo ),( Jae Yong Park ),( Sung Whan An ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-
To identify aberrantly hypermethylated DNA in lung cancer cells we established a genome-wide analysis for hypermethylation sites, namely Methyl DNA Isolation and Amplification (MeDIA) coupled-CpG microarray analysis. In the comprehensive methyaltion profiling analysis between human lung cancer, A549 cells and normal NHBE cells, we observed that several clusters of genes show a significant level of aberrancy in CpG island methylation pattern in cancer cells compared to normal cells. We further identified PCDHGA12 gene as a new marker of non-invasive diagnostics for lung cancer based on followings. 1) Transcription of PCDHGA12 gene is reactivated after treatment of A549 cells with demethylating agent. 2) Bisulfide clonal-sequencing reveals that CpG island of PCDHGA12 shows a distinctive differential methylation between two cell lines. 3) Pyrosequencing-based quantitative methylation assay for such region in tumor and non-tumorous tissues from lung cancer patients shows aberrant hypermethylation in 37 (92%) of the 40 tumor tissues. In clinical validation by pyrosequencingin induced-sputum of lung cancer patients (n=87) and healthy controls (n=51), we observed aberrant hypermethylation incident at significantly elevated level in samples derived from lung cancer patients. According to the optimal threshold calculated by ROC curve analysis, sensitivity and specificity of PCDHGA12 was 86.2% and 82.4%, respectively. PCDHGA12 methylation status could be a potential methylation biomarker alone or combined with others for the screen and the detection of relapse of lung cancer.
이혁수,강민필,이효송,이영우 충남대학교 공업교육연구소 2001 論文集 Vol.24 No.1
Reduction and sulfidation reactivities of mixed metal oxides were investigated by using a TGA. Mixed metal oxides consisted of CuO as the main active material, SiO₂ as the support material and both MoO₃ and Fe₂O₃ as the additives. Each material was chosen based on the literature survey. CS (CuO/SiO₂) sorbents were prepared to investigate the effect of support material, and consisted of various composition of CuO and SiO₂. CMS (CuO-MoO₃/SiO₂) and CFS (CuO-Fe₂O₃/SiO₂) sorbents were prepared to investigate the effect of additives and consisted of various composition of CuO and additive. In CMS and CFS sorbents, a support material was 25wt% SiO₂ because the previous study showed that 25wt% SiO₂ was needed to maintain the activity in multicycle experiment. Simple physical mixing method was chosen as the sorbent preparation method. Chatterjee-Conrad method was used to evaluate activation energies of sorbents from TGA data. The activation energy of CS sorbents decreased in reduction reaction and increased in sulfidation reaction as SiO₂ content increased. Fe₂O₃ was more favorable than MoO₃ as an additive material in terms of reduction reaction rate.
한국 재래식 된장과 고추장의 숙성 중 미생물, 효소활성 및 주요 성분의 변화
이종수,권수진,정성원,최영준,유진영,정동효 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2
재래식 된장과 고추장의 가스 발생을 억제하여 저장성을 향상시키기 위한 생물공학적 방법을 개발하고자 먼저 재래식 된장(봄메주 된장과 가을메주 된장)과 고추장(순천식)을 제조하여 4개월간 숙성시키면서 미생물과 효소활성 및 주요 성분의 변화를 조사하였다. 호기성 세균은 된장과 고추장 모두 숙성 60일까지 증가한 후 큰 변화가 없었고 혐기성 세균은 숙성기간 동안 된장에서는 10^7~10^8/g, 고추장에서는 10^5~10^6/g이었으며 효모는 된장에서는 숙성 15일까지 급격히 증가한 후 변화가 없었으나 고추장에서는 숙성 15일에 출현하여 60일까지 10^6/g으로 증가하였다. α-amylase 활성은 가을메주 된장에서, glucoamylase는 고추장에서 숙성기간 전반에 걸쳐 제일 높았고 산성 protease와 중성 protease 활성은 대체로 숙성 15일~30일경에 최대를 보였다. pH는 된장에서는 숙성 60일까지 7.0까지 높아졌지만 고추장은 숙성기간 내내 pH 5.0으로 낮아졌다. 수분은 봄메주 된장과 고추장에서 숙성이 진행됨에 따라 낮아져서 숙성 120일 후 40%이었으며 환원당은 고추장에서 숙성 15일까지 19.9%로 증가한 후 감소하는 경향이었다. Changes in microorganisms, enzyme activities and major components of two types of Doenjang prepared with spring Meju and autumn Meju and Kochujang were investigated during 5 months of fermentation. The viable cell counts of aerobic bacteria in Doenjang and Kochujang were increased up to 60 days of fermentation, but viable cell counts of anaerobic bacteria did not show remarkable changes during fermentation. Viable cell count of yeast showed a rapid increase up to 15 days of fermentation in Doenjang and 60 days in Kochujang. It was found that α-amylase activity of autumn Meju Doenjang and glucoamylase activity of Kochujang were higher than the other. Acidic and neutral protease showed the highest activity during 15~30 days of fermentation. The pH of Doenjang was increased up to pH 7.0 until 60 days of fermentation, but pH of Kochujang gradually decreased during fermentation. Moisture content of spring Meju Doenjang and Kochujang decreased to 40% during fermentation and reducing sugar content of Kochujang increased up to 15 days of fermentation, but decreased after that.
메조기공의 실리카-티타니아 코겔의 제조와 자율적 조습 및 광촉매 특성
이상화,곽중협,서태수,김효중,김동표 한국공업화학회 2003 공업화학 Vol.14 No.3
수용액상의 졸겔반응에 의해 메조기공의 실리카-티타니아 코겔을 제조하고 이들의 자율적 조습력과 광촉매 특성에 대해 검토하였다. 실리카-티타니아 코겔에 있어 조습력과 관계되는 세공크기와 용적은 본 연구에서 고안된역적정법에 의해 Ph 7부근 및 SiO_2/TiO_2 비가 상대적으로 큰 9/1인 경우에 가장 큰 생성물이 얻어졌다. 폐놀 분해율에 의한 광촉매 특성은 동일조건에서 SiO_2/TiO_2 비가 감소함에 따라 증가하였고, SiO_2/TiO_2 비가 9/1에서 세공크기 4.0~6.0 nm 및 세공용적 0.6~0.8 mL/g 범위로 제어된 코겔의 경우 환경습도 40~70% 범위에서 흡습량 25%, 방습량 45%로서 종래 조습재료 보다 자율조습력이 큰 것을 볼 수 있었고, 같은 조성의 실리카-티타니아 혼합 산화물과의 폐놀 분해율에 의한 광촉매 특성 비교에서도 우수한 물성을 보이고 있었는데 이것은 Ti-O-Si 결합형성으로 인해 코겔 구조내에 음전하 과잉으로 인한 활성점(브렌스테드 산점) 발현에 기인된 것으로 고찰된다. Silica-titania cogel materials have been prepared by aqueous sol-gel process using a back titration technique designed for this study. The humidity self-control and photocatalytic properties of the materials have been also investigated. In these silica-titania cogel materials, relatively large pore size and pore volume than can give a good humidity control ability are desired, and they were synthesized under the reaction condition at pH of 7 and SiO_2/TiO_2 ratio of 9/1. The photocatalytic property, which was measured by the decomposition ratio of phenol, increased with the decrease of SiO_2/TiO_2 ratio in the composition. The cogel at the SiO_2/TiO_2 ratio of 9/1, resulted in the pore size of 4.0~6.0 nm and the pore volume of 0.6~0.8mL/g. At the relative humidity range of 40~70%, the amounts of moisture absorption and desorption were 25% 45%, respectively, and these had a better humidity control ability than conventional ones. In addition, the cogel showed a superior photocatalytic property compared to that of silica and titania mixture with the same composition. This enhancement is probably due to the revelation of active sites by the excess negative charges that were induced by Ti-O-Si bond formation in the cogel structure.