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Kim Y.-S.,Chonbuk National University | Song J.-G.,Chonbuk National University | Lee I.-K.,Chonbuk National University | Yeo W.-H.,KT and G Central Research Institute | Yun B.-S.,Chonbuk National University
Mycobiology | Year: 2013

A Bacillus sp. BS061 significantly reduced disease incidence of gray mold and powdery mildew. To identify the active principle, the culture filtrate was partitioned between butanol and water. The antifungal activity against B. cinerea was evident in the butanol-soluble portion, and active substances were identified as cyclic lipopeptides, iturin A series, by nuclear magnetic resonance spectrometry (NMR) and mass analysis. Interestingly, antifungal activity against powdery mildew was observed in the water-soluble portion, suggesting that cyclic lipopeptides have no responsibility to suppress powdery mildew. This finding reveals that biocontrol agents of Bacillus origin suppress gray mold and powdery mildew through the secretion of different bioactive substances. © The Korean Society of Mycology. Source


Kim Y.-S.,Chonbuk National University | Song J.-G.,Chonbuk National University | Lee I.-K.,Chonbuk National University | Yeo W.-H.,KT and G Central Research Institute | Yun B.-S.,Chonbuk National University
Mycobiology | Year: 2013

The use of a microorganism, or its secretions, to prevent plant disease offers an attractive alternative or supplement to synthetic fungicides for the management of plant disease without the negative effects of chemical control mechanisms. During a screening for microorganisms with the potential to be used as microbial fungicides, Bacillus sp. BS061 was isolated from a plant leaf. The strain BS061 potently inhibited the mycelial growth of Botrytis cinerea, and significantly reduced disease incidence of powdery mildew in cucumber and strawberry. We also found that the culture filtrate of BS061 inhibited the mycelial growth of various plant pathogens. © The Korean Society of Mycology. Source


Yim N.,Chungnam National University | Ha D.T.,Chungnam National University | Ha D.T.,National Institute of Medicinal Materials | Trung T.N.,Chungnam National University | And 7 more authors.
Bioorganic and Medicinal Chemistry Letters | Year: 2010

Nine compounds isolated from the leaf and stem of Vitis amurensis Rupr. (Vitaceae) were evaluated for their antimicrobial activity against two oral pathogens, Streptococcus mutans and Streptococcus sanguis, which are associated with caries and periodontal disease, respectively. The results of several antimicrobial tests, including MIC, MBC, and TBAI, showed that three compounds inhibited the growth of the test bacteria at concentrations ranging from 12.5 to 50 μg/mL. Among these compounds, compound 5, trans-ε-viniferin, displayed the strongest activity against S. mutans and S. sanguis with MIC values of 25 and 12.5 μg/mL, respectively. This is the first report on the antimicrobial activity of stilbenes and oligostilbenes isolated from the leaf and stem of V. amurensis. Thus, this result suggests that natural antimicrobial compounds derived from V. amurensis may benefit oral health as plaque-control agents for the prevention of dental caries and periodontal disease. © 2009 Elsevier Ltd. All rights reserved. Source


Kim S.-H.,Hannam University | Shin C.-H.,KT and G Central Research Institute | Kim J.-S.,Hannam University | Kang S.-Y.,Hannam University | Kim S.-J.,Hannam University
Journal of the Korean Chemical Society | Year: 2015

The density functional theory (DFT) calculations on (H2O)n@C60, (n=1-10) complexes have been performed to elucidate hydrogen interaction between fullerene and water clusters. The optimized geometries, harmonic vibrational frequencies, and binding energies are predicted at various levels of theory. The harmonic vibrational frequencies for the molecules considered in this study show all real numbers implying true minima. We also compare the H-bond interaction between (H2O)n and (H2O)n@C60, (n=1-10) clusters. Source


Song H.-S.,Hannam University | Seo H.-I.,Hannam University | Shin C.-H.,KT and G Central Research Institute | Kim S.-J.,Hannam University
Journal of the Korean Chemical Society | Year: 2015

The DFT and ab initio calculations have been performed to elucidate hydrogen interaction of hydrogen polyoxide dimers, H2On-H2Om (n=1-4, m=1-4). The optimized geometries, harmonic vibrational frequencies, and binding energies are predicted at various levels of theory. The harmonic vibrational frequencies of the molecules considered in this study show all real numbers implying true minima. The higher-order correlation effect were discussed to compare MP2 result with CCSD(T) single point energy. The binding energies were corrected for the zero-point vibrational energy (ZPVE) and basis set superposition errors (BSSE). The largest binding energy predicted at the CCSD(T)/cc-pVTZ level of theory is 8.18 kcal/mol for H2O4-H2O3 and the binding energy of water dimer is predicted to be 3.00 kcal/mol. Source

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