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강연경,KANG, Yeongyeong 국립문화재연구원 2022 헤리티지:역사와 과학 Vol.55 No.3
Lacquer, in addition to high-end crafts such as lacquerware inlaid with mother-of-pearl, was an important strategic material used in a wide range of fields such as industry, architecture, and munitions during the Japanese colonial era. In particular, as the demand for lacquer used in munitions soared in the 1940s when the war started, a ticket system was introduced to restrict its distribution. Meanwhile, Japan experienced a chronic shortage of lacquer as a result of the rapidly increasing demand for it, and thus went on to import Chinese lacquer after the late 19th century. After the 1910s, the market share of Chinese lacquer reached 90%, and the local situation in China began to affect the supply and demand for lacquer in Japan. To counteract the issue, the Japanese government increased the production of lacquer in Joseon. As for the project to increase lacquer production in Joseon, objective indicators were prepared through a number of tests in the 1910s and 20s, which paved the way for the project to begin in earnest in the 1930s. Lacquer trees were planted and training classes on how to collect lacquer were held throughout the country. The Japanese government promoted the lacquer production industry as a promising side job for Koreans. The project, implemented in various parts of the country, reaped fruitful results, and it provided the basis for lacquer production in Korea that has continued to this day. At that time, the major regions in the southern part of the country where the project was concentrated were Wonju, Okcheon, and Hamyang, regions that are still known today as major production sites. The improved method of collecting lacquer taught to Koreans by the Japanese has now become the main method of collecting lacquer in Korea. This study attempts to identify the current status of the project to increase lacquer production through various records from the Japanese colonial era with a view to contributing to the study of modern lacquer craft history.
강연경 ( Yeongyeong Kang ),( Denver Walitang ),( Poulami Chatterjee ),표채은 ( Chaeeun Pyo ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Methane (CH4) is currently receiving great attention due to its severe impact on the environment as a greenhouse gas. The atmospheric concentration of methane is continuously increasing and its average concentration is around 1.87 mg L<sup>-1</sup>. Methane is produced in nature when methanogens digest plant material in the absence of oxygen. Methane emission from rice fields is one of the largest individual sources in the global budget of atmospheric CH<sub>4</sub>. Methane-oxidizing bacteria (MOB) are phylogenetically diverse groups defined by their ability to use methane as a major carbon and energy source. Aerobic MOB, which are widely present in natural environments, can utilize methane as the sole carbon and energy source through a unique enzyme system of methane monooxygenase (MMO). MMO has a soluble cytoplasmic form (sMMO) and a particulate membrane associated form (pMMO). The objective of this study is to investigate the presence of sMMO in Methylobacterium spp. The selected strains for the current study, Methylobacterium spp. were isolated from rice. MOB are a subset of a physiological group of bacteria known as methylotrophs. The sMMO consists of three components, proteins A, B, and C. Protein A is coded for by the mmoX, mmoY, and mmoZ genes. Protein B is coded for by the mmoB gene. Protein C is the reductase component of the enzyme and is coded for by the mmoC gene. The presence of sMMO in Methylobacterium spp. was proven through polymerase chain reaction (PCR) using mmoC specific primer. This results indicate that there were 18 out of 19 strains of Methylobacterium. spp with sMMO detected through PCR-based amplification of an mmoC gene. PCR products of the correct size (314 bp) were obtained with all of the Methylobacterium spp. used in this study. In the current study confirming the oxidative activity of the strains that contain the sMMO. Future study the growth of these isolates using methane as the sole carbon source and then assess methane oxidation potential of by gas chromatography and their contribution in atmospheric methane oxidation.
짝자래나무[Rhamnus yoshinoi] 가지 추출물에 의한 전립선암세포의 Wnt/β-catenin 분해 유도 활성 및 GC/MS 분석
강연경(Yeongyeong Kang),어현지(Hyun Ji Eo),김다솜(Da Som Kim),박영기(Youngki Park),박광훈(Gwang Hun Park) 한국식물생명공학회 2021 JOURNAL OF PLANT BIOTECHNOLOGY Vol.48 No.2
We evaluated the anti-cancer activity against human prostate cancer cells and the associated molecular mechanism of extracts from the branches of Rhamnus yoshinoi (RYB). Treatment with RYB suppressed viability of human prostate cancer cells (PC-3) and decreased protein levels of both β-catenin and T-cell factor 4 (TCF4). This was reflected in reduced TCF4 mRNA, but not decreased β- catenin mRNA. PC-3 cells were pretreated with the proteosome inhibitor MG132 before treatment with RYB, which blocked RYB-mediated down regulation of β-catenin in PC-3 cells, thus confirming that RYB promotes the proteasomal degradation of β-catenin. RYB induced β-catenin phosphorylation, and GSK-3β inhibition by LiCl blocked the phosphorylation and proteasomal degradation of β- catenin by RYB. These results suggest that GSK-3β may be an important upstream kinase for RYB-mediated regulation of β-catenin. Finally, GC/MS analysis of RYB identified 18 compounds. Based on these findings, RYB shows potential for development as a therapeutic agent for prostate cancer