Yong Pyo Hong
Andong National University
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Publication
Featured researches published by Yong Pyo Hong.
Acta Crystallographica Section E-structure Reports Online | 2013
Dohyun Moon; Jong-Ha Choi; Keon Sang Ryoo; Yong Pyo Hong
The crystal structure of [Cr(NCS)2(cyclam)]NCS (cyclam = 1,4,8,11-tetraazacyclotetradecane, C10H24N4) has been determined by using synchrotron radiation at 98 K. The CrIII atom is in a slightly distorted octahedral environment with four N atoms of the macrocyclic ligand and two N-coordinated NCS− anions in cis positions. The average Cr—N(cyclam) and Cr—NCS bond lengths are 2.085 (5) and 1.996 (15) Å, respectively. In the crystal, the uncoordinating SCN− anion is hydrogen bonded through N—H⋯S and N—H⋯N interactions to neighbouring complex cations.
Research in Plant Disease | 2012
Mihyeon Jeon; Wonsu Cheon; Yonggyun Kim; Yong Pyo Hong; Young-Keun Yi
Indole compound is a bacterial metabolite synthesized and released by an entomopathogenic bacterium, Xenorhabdus nematophila K1. The antibiotic activity was evaluated against plant pathogens, such as Phytophthora blight and anthracnose of red pepper. Indole significantly suppressed mycelial growth of Phytophthora blight and anthracnose pathogens. Under natural sunlight conditions, indole maintained the antifungal activity for at least sixty days. The activity was not affected under the condition of soil-water. When the indole suspension was applied to surface soil before transplanting of red pepper seedlings and was then regularly sprayed to the foliage of the plants with ten days interval, it resulted in significant reduction of the disease occurrences (Phytophthora blight, anthracnose, soft rot, and black mold) by about 30%. These results suggest that indole can be used to control Phytophthora blight and anthracnose of red pepper.
Acta Crystallographica Section C-crystal Structure Communications | 2016
Dohyun Moon; Yong Pyo Hong; Jong-Ha Choi
Constrained cyclam derivatives have been found to exhibit anti-HIV effects. The strength of binding to the CXCR4 receptor correlates with anti-HIV activity. The conformation of the macrocyclic compound is very important for co-receptor recognition. Therefore, knowledge of the conformation and crystal packing of macrocycles has become important in developing new highly effective anti-HIV drugs. Structural modifications of N-functionalized polyaza macrocyclic compounds have been achieved using various methods. A new synthesis affording single crystals of the title tetraazapentacyclo[16.4.0.1(2,17).1(6,13).0(7,12)]tetracosane macrocycle, C22H40N4, is reported. Formaldehyde reacts readily at room temperature with the tetraazatricyclo[16.4.0.0(2,17)]docosane precursor to yield a macropolycycle containing two five-membered rings. Characterization by elemental, spectroscopic and single-crystal X-ray diffraction analyses shows that the asymmetric unit contains half of a centrosymmetric molecule. The molecular structure shows a trans conformation for the two methylene bridges owing to molecular symmetry. The crystal structure is stabilized by intramolecular C-H...N hydrogen bonds. NMR and IR spectroscopic properties support the methylene-bridged macrocyclic structure.
Research in Plant Disease | 2013
Wonsu Cheon; Doyeon Kim; Yonggyun Kim; Yong Pyo Hong; Young-Keun Yi
3-(4-Hydroxyphenyl)-propionic acid (HPP) is a bacterial metabolite synthesized and released by an entomopathogenic bacterium Xenorhabdus nematophila K1. In this study, the control efficacy of HPP was tested against Phytophthora blight and anthracnose of red pepper plants. HPP suppressed mycelial growth of Phytophthora blight and anthracnose pathogens. Under natural sunlight condition, HPP maintained the antifungal activity on the diseases for at least twenty five days. The antifungal activity was not decreased even in the condition of soil-water. It was proved that HPP was able to penetrate the roots and travel upward of the red pepper plants. When HPP suspension was applied to soil rhizosphere before transplanting the red pepper seedlings or was regularly sprayed to the foliage of the plants with ten days interval, it resulted in significant reduction of the disease occurrences (Phytophthora blight and anthracnose) without any phytotoxicity. These results suggested that HPP can be developed to a systemic agrochemical against Phytophthora blight and anthracnose of red pepper plants.
Bulletin of The Korean Chemical Society | 2007
Keon Sang Ryoo; Sang Hyuk Byun; Jong-Ha Choi; Yong Pyo Hong; Young Tae Ryu; Jae Seol Song; Dong Suk Lee; Hwa-Sung Lee
Chemosphere | 2005
Keon Sang Ryoo; Seong-Oon Ko; Yong Pyo Hong; Jong-Ha Choi; Sunghwan Cho; Yonggyun Kim; Yeon Jae Bae
Journal of Asia-pacific Entomology | 2010
Sony Shrestha; Yong Pyo Hong; Yonggyun Kim
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2008
Jong-Ha Choi; Sik Young Choi; Yong Pyo Hong; Seong-Oon Ko; Keon Sang Ryoo; Sang Hak Lee; Yu Chul Park
Bulletin of The Korean Chemical Society | 2001
Jong-Ha Choi; Yong Pyo Hong; Yu Chul Park; Sang Hak Lee; Keon Sang Ryoo
Bulletin of The Korean Chemical Society | 2014
Yong Pyo Hong; Sung Hong Lee; Jong-Ha Choi; Ayana Kashima; Go Nakamura; Takayoshi Suzuki