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Methylation Markers in Renal Cell Carcinoma
Sung Pil Seo,Yong-June Kim 대한비뇨기종양학회 2016 대한비뇨기종양학회지 Vol.14 No.1
Many tumor markers in relation to renal cell carcinoma (RCC) have been evaluated for detecting and monitoring diseases outcomes. However, none of these biomarkers reported to date has shown sufficient sensitivity and specificity for as a detector and prognosticator of the whole spectrum of RCC in routine clinical practice. The limited value of the established prognostic markers requires analysis of new molecular parameters of interest in predicting the prognosis of RCC patients; in particular, the high-risk patient groups at risk of recurrence and progression. Abnormal methylation of CpG islands can efficiently repress transcription of the associated gene in a manner akin to mutations and deletions. Recent progress in the understanding of epigenetic modification and gene silencing has provided new opportunities for the detection, treatment, and prevention of cancer. Methylation is an important molecular mechanism in RCC and could be used as a diagnostic and prognostic marker. Aberrant patterns of epigenetic modification would be, in near future, crucial parameters in cancer diagnosis, prognosis and a good target for developing novel therapies while maintaining the quality of life. This review discusses the epigenetic issues involved in the detection and prediction of prognosis in RCC.
Effect of a Pressure Relief System in a High-speed Railway Tunnel
Sang Yeon Seo(서상연),Heesang Ha(하희상),Sang Pil Lee(이상필) 한국암반공학회 2018 터널과지하공간 Vol.28 No.3
고속 열차는 승객과 화물을 대량으로 빠른 시간에 운송할 수 있어 세계 여러 나라에서 고속철도 건설이 증가하고 있다. 열차가 고속으로 주행할 경우 열차의 전두부에 공기 저항이 발생하며, 이러한 공기 저항을 감소시키기 위하여 열차의 형상을 유선형으로 설계한다. 고속으로 주행하는 열차가 터널에 진입할 때, 터널 내에서 발생한 공기 저항으로 인하여 개활지 주행 시 보다 훨씬 큰 동력이 요구된다. 따라서 열차가 터널에 진입할 때 열차에 작용하는 공기 저항을 감소시키기 위하여 열차의 주행 속도를 감소시킨다. 이렇게 열차의 속도를 감소시킬 경우, 고속 열차의 운송 능력 및 장점이 감소되기 때문에 터널 내에서 열차 주행으로 인하여 발생되는 공기 저항을 감소시키는 설비가 필수적이다. 이 연구에서는 터널 내에서 열차의 고속 주행을 위하여 필요한 공기 압력 제어 시스템의 효과를 분석하기 위하여 1차원 수치해석을 수행하였다. 1차원 수치해석 프로그램을 통하여, 터널의 단면적 및 공기압력 제어 덕트의 단면적과 배치간격이 터널 내에서 발생하는 공기 저항에 미치는 영향을 상세히 분석하였다. High-speed trains have been developed widely in many countries in order to transport large quantity of people and commodities rapidly. When a high speed train enters a tunnel, aerodynamic resistance is generated suddenly. The resistance caused from air pressure induces micro pressure wave and discomfort to passengers in a train. Therefore, a pressure relief system should be installed in a tunnel to reduce the resistance acting against the running train in a tunnel. Additionally, the shape of a grain should be streamlined in order to reduce aerodynamic resistance caused by a high-speed train. The cross-section of a tunnel also should be carefully designed to reduce discomfort of passengers. This study represents the effect of pressure relief ducts installed between two running tunnels. The pressure relief duct was integrated with a cross-passage in order to save cost and construction time. One-dimensional network numerical simulations were carried out in order to estimate the effect of pressure relief systems.
Optimal culture conditions for the production of pullulan by Aureobasidium pullulans HP-2001
Seo,Hyung Pil,Son,Chang Woo,Kim,Hyun Sook,Kim,Sung Koo,Lee,Jin Woo 한국생명과학회 2001 한국생명과학회 학술발표회 Vol.33 No.-
The production of pullulan by Aureobasidium pullulans HP-2001 was investigated under various ratios of glucose as the carbon source to yeast extract as the nitrogen source. A. pullulans HP-2001 was the UV-induced mutant of A. pullulans ATCC 42023 and showed to overcome catabolite repression against glucose up to 20%(w/v). The highest conversion rate of pullulan from glucose was 36.7% when concentrations of glucose and yeast extract were 5% (w/v) and 0.15% (w/v), respectively. Maximal production of pullulan was 26.6 g/l when concentrations of glucose and yeast extract were 8% (w/v) and 0.25% (w/v), respectively. Optimal pH of medium and concentration of K₂HPO₄for the production of pullulan were 6.0 and 0.2% (w/v), respectively.
Influence of Yeast-treated Rice By-products on Growth, Yield and Grain Quality of Rice
Seo, Pil Dae,Nunez, John Paolo,Park, Jae Sang,Ultra, Venecio U. Jr.,Lee, Sang Chul The Korean Society of Crop Science 2013 한국작물학회지 Vol.58 No.2
The use of agricultural by-products as alternative nutrient sources in crop production had gained popularity in order to reducing the rate of chemical fertilizer application in the field. This study was conducted to determine whether the application of rice milling by-products treated with yeast inoculants could substitute, or reduce the rate of chemical fertilizer application. The results of agronomic measurements showed that the effect of incorporated materials was not immediate, as compared to 100% chemical fertilizer application. However, grain yield and quality was either the same or greater than 100% chemical fertilizer application. It was found out that expanded rice hull (treated with yeast or not) could reduce the rate of applying chemical fertilizers by half. Also, yeast treatment was only favorable only to expanded rice hull and not with rice bran, and was already found to be a potential material in reducing chemical fertilizer application in rice production.
Incidence rate of Aneurysmal SAH in Gwangju City and Jeollanamdo Province in 2007
Seo, Bo-Ra,Kim, Tae-Sun,Joo, Sung-Pil,Jang, Suk-Jung,Lim, Jun-Seob,Oh, Chang-Wan The Korean Neurosurgical Society 2010 Journal of Korean neurosurgical society Vol.47 No.2
Objective : The incidence of subarachnoid hemorrhage (SAH) worldwide varies considerably. In spite of many reports about the incidence of SAH, there has been no report about the incidence of SAH on the basis of the Korean population. The purpose of this hospital-based study was to assess the actual incidence rates of aneurysmal SAH in Gwangju city and Jeollanamdo province. Methods : All cases of SAH confirmed by computerized tomography (CT) between January 2007 and December 2007 were selected for analysis. For the data collection, three major training hospital and ten general hospitals working the CT in Gwangju city and four major general hospitals in Jeollanamdo province participate in this study. Results : According to the official census of Korea, the population was 1,413,444 in Gwangju city and 1.929,836 in Jeollanamdo province in 2007. There were 163 patients in Gwangju city and 266 patients in Jeollanamdo province confirmed SAH by CT in 2007. The crude and the age- and sex-adjusted annual incidence rates per 100,000 population for all ages in Gwangju city were 11.5 and 12.4 for aneurysmal SAH and in Jeollanamdo province were 13.8 and 10.8. The incidence was higher in women and increased with age. The gender distribution varied with age. At young ages. the incidence was higher in men while after the age of 40 years, the incidence was higher in women. Conclusion : In the present study, the age- and sex-adjusted annual incidence rates is 11.8 in Gwangju city and Jeollanamdo province. The incidence was higher in women and increased with age.