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김형준,전영훈,김광현 대한건축학회 2003 대한건축학회논문집 Vol.19 No.8
This study is to examine the spatial construction found in expositions in the 19^(th) century. The purpose is to understand architecture in the 19^(th) century as the origin of the modern architecture in the 20^(th) century, and to reveal the authenticity of modern spaces through spaces of expositions. Expositions in the 19^(th) century are one of the leading architectural themes in that age, Having a vast influence on entire Europe, they are new modern institutional buildings emerging with new modern technologies and culture. This study analysis expositions through three viewpoints in the modern institutional buildings which were 'time', 'threshold' and 'perception'. As a result, spatial construction in expositions were formed by things, people and space which were related to the three viewpoints. The phenomenon and the process in the spatial construction of exposition are related to the modern architecture, and also relations in the space of exposition are extended to the city and the architecture in the 20^(th) century. Therefore, the modern institutional buildings in the 19^(th) century will be studied as to reveal identity of the modern architecture and its modernity.
Screening of Juvenile Hormone Disruptors from Myzus persicae using Yeast β-galactosidase Assay
Jun Hyoung Jeon,Seon-Ah Jeong,Doo-Sang Park,Sang-Woon Shin,Boyoon Seo,Hyun-Woo Oh 한국농약과학회 2020 농약과학회지 Vol.24 No.3
This study established a basis for the development of eco-friendly pest control agents using plant extracts that interfere with the binding of insect juvenile hormones. Owing to its substantial influence on crop production, the peach aphid (Myzus persicae) is a known economic pest. To produce transformants for the screening of plant extracts, a yeast two-hybrid assay was performed with the juvenile hormone receptor Methoprene-tolerant of Myzus persicae and its partner protein steroid receptor co-activator. Members of the Cupressaceae, Pinaceae, Theaceae, and Magnoliaceae families were identified as high-ranking plant groups based on the results of the screening for plant extracts with elevated juvenile hormone disruptor (JHD) activity. High JHD activity was confirmed in extracts of various species, including Camellia japonica, Lindera erythrocarpa, Carpesium abrotanoides, Magnolia obovata, and Hedera rhombea. Based on these results, the extracts that showed considerable JHD activity are considered safer and more environmentally friendly than existing pest control agents and, hence, could be used as a basis for the development of new pest control agents.
Plant-derived metabolites as juvenile hormone disruptor in Spodoptera frugiperda larvae
Jun Hyoung Jeon,Seon-Ah Jeong,Sang-Woon Shin,Doo-Sang Park,Ji-ae Kim,Hong-Hyun Park,Hyun-Woo Oh 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
During the larval development process of insects, juvenile hormone (JH) is essential for regulating various aspects of larval life, including growth, reproduction, and behavior, throughout their larval stage. The larval stage of Spodoptera frugiperda, when it consumes plant-derived metabolites, develops into pupae, but these pupae are unable to molt successfully. In this way, plant-derived metabolites contain or produce inhibitors of juvenile hormone, thereby disrupting the development of insect larvae and making them vulnerable to harm. Therefore, in this study, we established an in vitro screening system using yeast cells transformed with the Met-SRC juvenile hormone receptor of S. frugiperda. Through this system, we were able to identify juvenile hormone disruptors from plant-derived metabolites and confirm their developmental inhibitory effects on the larvae of S. frugiperda.
Jun Hyoung Jeon,Seon Ah Jeong,Ji-Ae Kim,Doo-Sang Park,Boyoon Seo,Hyun-Woo Oh 한국농약과학회 2022 농약과학회지 Vol.26 No.1
Tobacco cutworm (Spodoptera litura [Fabricius]) is a destructive insect pest distributed in densely cultivated parts of Asia and Australia. This insect shows an explosive increase in its population in summer. Furthermore, tobacco cutworm larvae are very difficult to control because of their strong resistance to commonly applied chemical insecticides. To identify alternative pesticides that circumvent toxic effects to the environment and the threat of insecticide resistance, we aimed to examine plant extracts with insect growth regulatory activity targeting juvenile hormones (JHs). Using RNA sequencing and de novo transcriptome assembly, S. litura cDNA sequences of the JH receptor methoprene-tolerant (Met) and steroid receptor coactivator (SRC) were determined and used to generate yeast two-hybrid bait and prey plasmids. The JH/JH analog-mediated binding of Met and SRC was measured by assaying β-galactosidase activity. In the plant extract activity assay, we tested 1,628 plant extracts in transformants bearing Met and SRC. We identified 67 plant extracts with high JH disruptor (JHD) activity in tobacco cutworm, of which Gladiolus gandavensis extract showed the highest JHD activity. Plant-based JHDs might serve as a viable and sustainable alternative to chemical pesticides to control tobacco cutworm infestations in the field.
The development of a novel screening system to identify species-specific anti-JH compounds
Jun Hyoung Jeon,Doo-Sang Park,Sang Woon,Bong-Kyu Byun,Hyun-Woo Oh 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.04
Insect infestation leads to huge loss of agricultural products and transmission of vector-borne diseases causing millions of deaths per annum. Juvenile hormone (JH) controls the development and reproduction of insects, therefore the grouth of insects can be inhibited by interfering the action of JH. Based on this, we developed a novel insect species-specific screening system to identify juvenile hormone antagonists (JHANs) from natural origin. These compounds can disrupt JH-mediated insect development by interfering the binding of a heterodimer, steroid receptor coactivator (SRC), with its partner protein, the methoprene-tolerant (Met) JH receptor. This screening system could be used as a new tool to develop eco-friendly and species-specific insecticides.