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( Byung Yeoup Chung ),( Jae Young Cho ),( Seung Sik Lee ),( Yoshiharu Nishiyama ),( Yuji Matsumoto ),( Kenji Liyama ) 한국식물학회 2008 Journal of Plant Biology Vol.51 No.2
Tracheary elements (TEs) were physically separated from the hulls of cacao pods (Theobroma cacao L.). Their morphological features were extensively investigated with scanning electron microscopy and chemical characterization. Spiral TEs were covered with a thin layer of primary wall that had a web-like structure on its outer surface. These TEs had a spiral circularity diameter of 8.2 ± 0.6 μm and an estimated secondary wall thickness of about 2.1 ± 0.2 μm. Polarized microscopy analysis revealed that the cellulose microfibrils were aligned parallel to that thickening. Lignin content was 36.1%, with a 0.13:1.00 molar ratio of syringyl to guaiacyl units and a 1.09:1.00 molar ratio of erythronic acid and threonic acid. Total yields of the alkaline nitrobenzene oxidation and ozonation products were 324.5 and 148.8 μmol g?1 of extract-free TEs, respectively. Based on these morphological and lignin characteristics, we conclude that fully ripened cacao hulls exhibit the same features of secondary wall thickening as those seen at an earlier stage.
Byung Yeoup Chung,Jae Taek Lee,Seung Sik Lee,Suvendu Mondal,Bhumi Nath Tripathi,Siu Kim,Keun Woo Lee,Sung Hyun Hong,Hyoung-Woo Bai,Jae-Young Cho 한국분자세포생물학회 2016 Molecules and cells Vol.39 No.8
Alkyl hydroperoxide reductase subunit C from Pseudomonas aeruginosa PAO1 (PaAhpC) is a member of the 2-Cys peroxiredoxin family. Here, we examined the peroxidase and molecular chaperone functions of PaAhpC using a site-directed mutagenesis approach by substitution of Ser and Thr residues with Cys at positions 78 and 105 located between two catalytic cysteines. Substitution of Ser with Cys at position 78 enhanced the chaperone activity of the mutant (S78C-PaAhpC) by approximately 9-fold compared with that of the wild-type protein (WT-PaAhpC). This increased activity may have been associated with the proportionate increase in the high-molecular-weight (HMW) fraction and enhanced hydrophobicity of S78C-PaAhpC. Homology modeling revealed that mutation of Ser78 to Cys78 resulted in a more compact decameric structure than that observed in WT-PaAhpC and decreased the atomic distance between the two neighboring sulfur atoms of Cys78 in the dimer-dimer interface of S78C-PaAhpC, which could be responsible for the enhanced hydrophobic interaction at the dimer-dimer interface. Furthermore, complementation assays showed that S78C-PaAhpC exhibited greatly improved the heat tolerance, resulting in enhanced survival under thermal stress. Thus, addition of Cys at position 78 in PaAhpC modulated the functional shifting of this protein from a peroxidase to a chaperone.
Taxonomic review of the family Thyrididae (Lepidoptera) in Korea
Sang-Yeoup Kim,Bong-Kyu Byun 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The family Thyrididae was known as a small group comprising 940 species in the world (Nieukerken et al, 2011). In Korea, the first report of the family was made by Park (1983) with four species. Later, 10 species of 4 genera was enumerated by several researchers (Park & Byun, 1990; Choi, 2005). The typical characteristics of the family Thyrididae is a window-like transparent pattern of wings. Some species in the family are classified as insect pest species (Jo, 1995). Thus, it is important to study the group for the applied fields. In this study, the reveiw of the family Thyrididae in Korea was conducted. All available materials was examined and illustrated. Also the collecting localities, illustrations of adults and genitalia are provided.
Byung Yeoup Chung,Sang Guei Lee,Jae Young Cho 한국응용생명화학회 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.6
The degradation of antibiotic tetracycline by using electron beam irradiation was investigated in an aqueous solution as a function of irradiation dose. The degradation efficiency of tetracycline was a level of 100% at an irradiation dose of 5 kGy. The deg
Sang-Yeoup Kim,Hae-Ryun Choi,Ye-Seul Kim,Joo-Hee Lee,Hyunwook Kim,Jae Deok Son,Bong-Kyu Byun 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
최근 변화하는 기후로 인해 외래해충의 유입이 증가하였으며 발달된 교통수단 등으로 인해 새로운 지역으로 확산이 가속화되는 추세(Bale, 2002)이므로 그 중요성이 증대하고 있다. 본 연구는 우리나라의 최근에 침입한 대표적인 흡즙성 해충인 미국선녀벌레를 대상으로 충청지역의 발생분포를 파악하기 위해 수행되었다. 이를 위해 2018년 5월부터 8월까지 충남북 관내 주요 행정구역을 대상으로 미국선녀벌레 발생여부와 피해정도를 중심으로 조사하였다.
Food Science ; Compositional Characterization Of Cacao (Theobroma Cacao L.) Hull
Byung Yeoup Chung,KenJi Iiyama,Kang Wan Han 한국응용생명화학회 2003 Journal of Applied Biological Chemistry (J. Appl. Vol.46 No.1
Chemical composition and structural characteristics of cacao (Theobroma cacao L.) hull were investigated. Holocellulose, Klason residue, total amino acid, lipid, ash, and glucose contents were 334, 320, 96, 99, 93, and 174 g·㎏^-1, respectively. Other neutr