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식물 추출물의 화장품 오염 미생물에 대한 생육억제 활성
류영현,김동근,연일권,허창석,류정아,조우식,박상조,이윤수 한국약용작물학회 2015 한국약용작물학회지 Vol.23 No.1
A total of 708 methanol extracts from 599 species in 126 families(e.g. Aceraceae) of plant resources werescreened for inhibition of cosmetics contaminating microbe, Staphylococcus aureus, Pseudomonas aeruginosa and Candidaalbicans using 96-well microplate bioassay. Four plant extracts including Celastrus orbiculatus inhibited the growth of Staphylococcusaureus over 90%, 38 extracts including Acer palmatum var. nakaii inhibited the growth of Pseudomonas aeruginosaover 60% and 10 extracts including Ilex crenata var. microphylla inhibited growth of Candida albicans over 60%. Plantextracts showing growth inhibition activity against S. aureus, P. aeruginosa and C. albicans could be used as a referenceguide for the future development of natural preservatives for cosmetics.
Alendronate-Polyurethane Films for Guided Bone Regeneration
류영현,최강호,오도현,최성욱 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We synthesized biodegradable and hydrophilic polyurethane (PU) dispersion by a prepolymer method. Dimethylol propionic acid, which served as the polyol, provides carboxyl groups in PU and improves the hydrophilicity of the PU film. The carboxyl groups of the PU were utilized for the conjugation with alendronate (Alen) and the ionic cross-linking among PU polymers. Alen conjugation and ionic cross-linking both significantly reduced the water contact angle. The Alen-conjugated PU (Alen-PU) film showed a ductile property with high elongation at break. The ionic cross-linking of Alen-PU film resulted in the improvement of Young"s moduli and tensile strength. In addition, the biodegradation time of the PU-based films was increased due to the ionic cross-linking. The effect of Alen in PU film reduced proliferation and enhanced differentiation of pre-osteoblasts. We believed that the Alen-PU films have wide application potential in tissue engineering, especially for guided bone regeneration.
포도갈색무늬병 발병수준이 ‘켐벨얼리’ 유기포도의 광합성률에 미치는 영향
류영현,배수곤,연일권,김광섭,박상조,박준홍,박종호 한국유기농업학회 2016 韓國有機農業學會誌 Vol.24 No.4
Grape cultivar “Campbell Early” account for 70% of table grape in Korea and Leaf Spot Disease caused by Pseudocercospora vitis is one of a major disease in greenhouse and field grown area during late summer season in both of organic and conventional grape farm. Leaf spot disease can cause lowing of sugar content in fruit and vine growth and very difficult to control especially in organic field. Photosynthesis ability and chemical components are compared between leaf spot disease infected leaves with degree of necrotic area. With increase of disease necrotic area, CO2 differential value, water use efficiency and CO2 assimilation and respiration ratio are decreased proportionally and on the other hand, stomatal conductance value is not affected by disease necrotic area. Chlorophyll contents are also decreased by 50% in heavily infected leaves and imply decrease of chlorophyll contents is a major source of photosynthesis ability decline. With increase of disease necrotic area in leaves, total nitrogen and phosphate contents are decreased and on the other side, total carbon, potassium, calcium and magnesium contents are increased. From this research, we can infer that not only chemical control program is important in control of leaf spot disease but also fertilizing program is significant especially in organic agronomical control of fungal disease in grape cultivar “Campbell Early”.
Xanthomonas aboricola pv. pruni에 의한 자두 검은점무늬병의 발생과 핵과류 과수 품종에 대한 병원성
류영현,이중환,권태영,김승한,김동근 한국식물병리학회 2012 식물병연구 Vol.18 No.1
Xanthomonas arboricola pv. pruni is the causal agent of bacterial black spot disease on some stone fruits, e.g. peach, plum and apricot. To evaluate pathogenicity of Xanthomonas arboricola pv. pruni strain from plum,inoculum of the isolated strain was spray inoculated to fruits and leaves of apricot, Japanese apricot and plum. Apricot and Japanese apricot showed severe black spot symptoms on fruits and shot hole symptoms on leaves. In case of apricot, about fifty percent of fruits did not grow and dropped by hypersensitive reaction to spray infection. Plum, cv. Formosa was very susceptible, showing severe black injury lesions on fruits and cankers on leaves and new twigs. On the other hand, plum cv. Daesukjosaeng, was highly resistant. Fruits of several plum cultivars such as Formosa and Chuhee were severely infected at natural infected orchards by X. arboricola pv. pruni. Where as those of Daesukjosaeng, Taeyang, Soldam and Hongrogen were moderately infected.
류영현,이중환,권태영,김승한,김동근 한국식물병리학회 2012 식물병연구 Vol.18 No.4
Xanthomonas arboricola pv. pruni causes black spot symptom on fruit of plum, resulting in yield loss by reduction of marketable fruit production. To develop an effective control program, some chemicals were sprayed in various scheme during dormant season and growing season after blooming period. Copper-based chemicals were sprayed during dormant season and antibiotic-based chemicals were sprayed during fruit growing season. Sprays of antibiotic-based chemicals in growing season was more effective than copper-based chemicals sprays in dormant season. Three applications of antibiotic-based chemicals in 10 days interval starting 10 days after full blooming controlled disease incidence as much as 93%, whereas applications of copper-based chemicals in dormant season controlled 26−42%. Antibiotic-based chemicals application starting 10 days after full blooming was more effective than starting 20 or 30 days after full blooming.
포도갈색무늬병 발병수준이 ‘켐벨얼리’ 유기포도의 광합성률에 미치는 영향
류영현,배수곤,연일권,김광섭,박상조,박준홍,박종호 한국유기농업학회 2016 韓國有機農業學會誌 Vol.24 No.4
Grape cultivar “Campbell Early” account for 70% of table grape in Korea and Leaf Spot Disease caused by Pseudocercospora vitis is one of a major disease in greenhouse and field grown area during late summer season in both of organic and conventional grape farm. Leaf spot disease can cause lowing of sugar content in fruit and vine growth and very difficult to control especially in organic field. Photosynthesis ability and chemical components are compared between leaf spot disease infected leaves with degree of necrotic area. With increase of disease necrotic area, CO2 differential value, water use efficiency and CO2 assimilation and respiration ratio are decreased proportionally and on the other hand, stomatal conductance value is not affected by disease necrotic area. Chlorophyll contents are also decreased by 50% in heavily infected leaves and imply decrease of chlorophyll contents is a major source of photosynthesis ability decline. With increase of disease necrotic area in leaves, total nitrogen and phosphate contents are decreased and on the other side, total carbon, potassium, calcium and magnesium contents are increased. From this research, we can infer that not only chemical control program is important in control of leaf spot disease but also fertilizing program is significant especially in organic agronomical control of fungal disease in grape cultivar “Campbell Early”.