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김문호 한국응용곤충학회 1971 한국응용곤충학회지 Vol.10 No.1
사과 탄저병은 매년 특정기간의 과실에 한하여 발병한다는 것으로 미루어 보아 지간에서 자낭각의 형으로 월동하는 것으로 보고 연구한 결과는 다음과 같다. 1) 사과, 포도, 아까시아 등의 공시나무가지에 병균이 감염되어서 포자퇴가 형성되는 것으로 보아 본 병균은 나무가지에서 월동이 가능한 것으로 생각된다. 우리나라에서는 발견하지 못했던 자낭세대가 접종된 공시나무가지의 병환부의 껍질속과 병과의 표피밑에서 검출되었으므로 자낭각의 형으로 지간에서 월동하여 일차전염원이 될 수 있다는 사실을 알았다. Apple bitter rot caused by Glomerella cingulata has been known to occur annually on the fruits of previously infected twigs and the trunks. This study was carried out to ensure whether the pathogen overwinters in the form of perithecium or not. Since the acervuli of the pathogen were formed in inoculated apple trees, it would be possible that the pathogen could overwinter on the twigs, Ascigerous stage was found both under the cuticle of the infected trunk and in outer layers of rotted fruits. Therefore, it could be concluded that the pathogen overwintered in the form of perithecium is a primary inoculum in next year. Ascigerous stage of the appfe bitter rot organism was observed for the first time in Korea.
Deformation Behavior of Polymeric Colloidal Photonic Crystals Induced by UV Irradiation
김문호,변두진,송시용,신세문,곽수경,최길영 한국고분자학회 2013 Macromolecular Research Vol.21 No.12
The deformation behavior of polymeric colloidal photonic crystals (CPCs) during UV irradiation was investigated. A CPC grown from a polystyrene (PS) colloidal suspension was prepared and exposed to UV light. The UV irradiation resulted in photochemical reactions that induced morphological changes in the surfaces of CPC,including deformations in the sizes, shapes, and packing structures of the PS particles. The crystal morphology evolution resulting from UV irradiation differed significantly from the photoaging behavior observed during exposure to a light source that mimicked natural sunlight. The structural deformations destroyed the optical properties (by deteriorating the photonic bandgap). The UV irradiation induced photooxidation processes that altered the composition of the polymer material surface.
Discoloration mechanism of polymer surface in contact with air–water interface
김문호,최길영,변두진,유지은 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
The white-colored inner surface of a polypropylene (PP) material containing water discolored and turned yellow. The discoloration occurred selectively on the surface at the point of contact with the air–water interface. Since the polymer surface was exposed to water in darkness at room temperature, no sign of deterioration or degradation of the polymer at the discolored surface was confirmed. This study conducts an in-depth analysis of the discoloration mechanism of the polymer surface. A variety of technical approaches, including microscopic, spectroscopic, and chromatographic analysis techniques, were used to investigate the nature of discoloration and the root cause. From the analysis results, the discoloration was ascribed principally to a phenol transformation compound having the structure of a quinone methide, which was identified as a degradation product of a primary antioxidant. Based on the observations and experimental results, a plausible discoloration mechanism was proposed.