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( Mostafa Koutb ),( Esam H. AIi ) 한국균학회 2010 Mycobiology Vol.38 No.4
Epicoccum purpurascens stain 5615 AUMC was investigated for its biocontrol activity against root rot disease caused by Pythium irregulare. E. purpurascens greenhouse pathogenicity tests using three leguminous plants indicated that the fungus was nonpathogenic under the test conditions. The germination rate of the three species of legume seeds treated with a E. purpurascens homogenate increased significantly compared with the seeds infested with P. irregulare. No root rot symptoms were observed on seeds treated with E. purpurascens, and seedlings appeared more vigorous when compared with the non-treated control. A significant increase in seedling growth parameters (seedling length and fresh and dry weights) was observed in seedlings treated with E. purpurascens compared to pathogen-treated seedlings. Pre-treating the seeds with the bioagent fungus was more efficient for protecting seeds against the root rot disease caused by P. irregulare than waiting for disease dispersal before intervention. To determine whether E. purpurascens produced known anti-fungal compounds, an acetone extract of the fungus was analyzed by gas chromatography mass spectrometry. The extract revealed a high percentage of the cinnamic acid derivative (trimethylsiloxy) cinnamic acid methyl ester. The E. purpurascens isolate grew more rapidly than the P. irregulare pathogen in a dual culture on potato dextrose agar nutrient medium, although the two fungi grew similarly when cultured separately. This result may indicate antagonism via antibiosis or competition.
박준완(Junwan Park),서예찬(Yechan Seo),AIi Charanandeh,이지근(Jeekeun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The disintegration characteristics of a liquid jet in crossflow were experimentally investigated by using shadowgraphy technique coupled with a high-speed camera and a continuous laser light. Four types of nozzles were tested with the ratio(q) of the crossflow velocity and the liquid volume flowrate, liquid viscosity in terms of breakup mode, spray trajectory, breakup points. As the viscosity of liquid increased, the penetration height and distance increased, but atomization performance became worse. The circular-shaped and the film-shaped nozzles showed the highest and the lowest jet trajectory height, respectively. The q value had a great impact on the jet trajectory height, and viscosity of injected liquid showed a minor effect.