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다공성 유리 슬릿을 가진 전기삼투펌프 기초 성능에 관한 연구
서상태(Sang Tae Seo),이호(Ho Lee),박철우(Cheol Woo Park) 한국가시화정보학회 2008 한국가시화정보학회 학술발표대회 논문집 Vol.- No.2
The basic concept and preliminary performance results of a miniaturized electroosmotic (EO) pump with diaphragms at both ends to divide working fluid and drug solution delivery part were presented in this study. The separation of an electroosmotic pumping liquid from a drug using diaphragms is mainly to have a freedom in choosing an electroosmotic pumping liquid and to achieve the optimal drug delivery, and, preferably its precise control. Porous glass frit material slit is employed as an central membrane to enhance electroosmotic pumping by reducing permeable gap space between glass frit. As a result, the absolute maximum flow rate increased as the pore radius and the slit thickness deceased.
서상태(Sang-Tae Seo),이중섭(Jung-Sup Lee),박종한(Jong-Han Park),한경숙(Kyoung-Suk Han),장한익(Han-Ik Jang) 한국원예학회 2005 원예과학기술지 Vol.23 No.4
Twenty-eight antibiotics were evaluated in vitro for sensitivity of 10 plant pathogenic bacterial strains. The strains belonged to the following species: Acidovorax avenae, Xanthomonas campestris, Ralstonia solanacearum, Burkholderia cepacia, Agrobacterium rhizogenes, Agrobacterium tumefaciens, Clavibacter michiganensis and Erwinia carotovora. The results of two-fold agar assay showed that all strains were resistant to cloxacillin and oxacillin. Additionally, some were resistant to sulfisoxazole, triple sulfa, bacitracin and penicillin. However, most strains were highly susceptible to tetracycline, doxycycline and moxalactam in decreasing order. Tetracycline seems to be an effective antibiotic, and further investigations to determine the method of treatment appear to be worthwhile.
서상태,오혜영,강하영,Seo, Sang-Tae,Oh, Hye-Young,Kang, Ha-Young 한국식품영양학회 2010 韓國食品營養學會誌 Vol.23 No.1
Effects of gamma irradiation on microbiological changes of Gorosoe sap were characterized during a post-irradiation storage at $4^{\circ}C$. The aseptically collected sap was irradiated and stored at $4^{\circ}C$ for 0 to 60 days and analysed for standard plate counts and 16S rDNA. There were significant differences in the total number of colony forming units(CFUs) of bacteria between irradiated and non-irradiated control sap. Bacteria of non-irradiated sap were present at levels of $1.5{\times}10^4{\sim}2.3{\times}10^8\;CFU/m{\ell}$, whereas no viable microbial cells were detected in sap after 10 kGy of irradiation during storage. According to the 16S rDNA sequence analysis, bacterial community structures decrease with time and the most abundant strain was Pseudomonas species. Our results suggested that gamma irradiation can be used to enhance the shelf-life of Gorosoe sap.
아바멕틴과 에마멕틴벤조에이트 수간주입 시기에 따른 잔류량과 소나무재선충(Bursaphelenchus xylophilus)에 대한 예방 효과
이상명(Sang Myeong Lee),정영학(Young Hak Jung),서상태(Sang-Tae Seo),김동수(Dong Soo Kim),이동운(DongWoon Lee) 한국농약과학회 2021 농약과학회지 Vol.25 No.4
Pine wood nematode (PWN), Bursaphelenchus xylophilus, was serious pine tree parasitic nematode in the world. Trunk injection is used as a preventive control method by injecting an agent into the trunk before the PWN becomes infected. This study was conducted in a pine forest to investigate the effect and residual amount of abamectin and emamectin benzoate, which are used as control agents for PWNs, according to the time of tree injection. There was a difference in the inhibitory effect of PWN infection according to the tree injection period. The tree mortality rate was low for abamectin from November to February and emamectin benzoate from October to April trunk injection treatment. The residual amount of the treated nematicides showed a difference according to the injection time. Abamectin showed the highest residual amount in March treatment, and emamectin benzoate showed the highest residual amount in December treatment. Considering the mortality rate of PWN infection and the residual amount, it is expected that trunk injections will be best done from November to February for abamectin and October to April for emamectin benzoate.
소나무재선충병 방제를 위한 에마멕틴 벤조에이트의 나무주사 시기와 천공수에 따른 약효와 잔류량 비교
이상명(Sang Myeong Lee),정영학(Young Hak Jung),서상태(Sang-Tae Seo),김동수(Dong Soo Kim),이동운(DongWoon Lee) 한국농약과학회 2021 농약과학회지 Vol.25 No.4
Tree injection is widely used as an effective method for preventing pine wilt disease. However, the method leaves behind scars on the trees, inflicted by the hole drilling activity done to create a pathway for nematicide injection. Therefore, this study was conducted to evaluate the effect of treatment, according to the number of drilled holes, and to find a suitable method of effectively administering the nematicide to prevent pine wilt disease while minimizing injuries to trees. In addition, in order to determine the suitable time of tree injection, the effect of treatment according to the number of days after tree injection of emamectin benzoate (EM) was investigated. In both medium- and large-sized pine trees, the number of drilled holes did not show any difference in inhibiting the population density multiplication of pine wood nematode after tree injection, and there was no difference in the residual amount of EM. In the case of EM injected into pine trees in February, the inhibitory effect was shown in the lower part of the trunk from 7 days after injection, and eventually, in the entire trunk after 21 days after injection. In the case of pressurized tree injection in May, the effect of inhibiting the multiplication of pine wood nematode was shown in the entire trunk from 14 days after injection. There was no difference in efficacy or residual amount depending on the number of injection holes. It is therefore recommendable to use an injection bottle to drill a minimum number of holes in trees for injection. In the case of EB tree injection for the prevention of pine wood nematodes, treatment within at least 3 weeks before the occurrence of vectors is recommended.
형태 특징 및 분자 분석에 의한 산철쭉 흰가루병균 Erysiphe izuensis 동정
조성은 ( Sung-eun Cho ),이상현 ( Sang-hyun Lee ),이선근 ( Sun-keun Lee ),서상태 ( Sang-tae Seo ),신현동 ( Hyeon-dong Shin ) 한국균학회 2018 韓國菌學會誌 Vol.46 No.1
The Rhododendron powdery mildew fungus Erysiphe izuensis has been recorded throughout Asia, including China, Japan, Korea, and Russia. In Korea, E. izuensis has been identified based on morphological characteristics of the anamorph found on introduced Rhododendron spp. We here describe the first identification of E. izuensis collected from Rhododendron yedoense f. poukhanense in Korea. Morphological characteristics of the teleomorph as well as internal transcribed spacer sequences of the species are provided. Moreover, we describe the characteristics of the primary conidia and conidial surface pattern of E. izuensis for the first time.
차병진,서상태,한상섭,Byeongjin Cha,Sang-Tae Seo,Sang-sup Han 한국식물병리학회 2024 식물병연구 Vol.30 No.1
Since the List of Plant Diseases in Korea (DisList) was first published in 1986, the 6th edition appeared 36 years later. In 2023, the 6.1 edition, a revised and improved version of the 6th edition, was released to the public on the web free of charge. The contents of DisList increased, with the number of hosts increasing from 437 taxa to 1,420 taxa and the number of disease species increasing from 1,539 to 6,680. Among these, tree diseases are 3,586 species and their hosts include 504 taxa, providing much help to experts who need them. Meanwhile, the importance of accurate disease names continues to grow with the legalization of tree care, but many disease names are still inappropriate or misused, causing confusion. Disease names that do not follow the naming regulations are still registered, and even if the same pathogen infects hosts of the same taxa, the disease names are given differently, and there are many disease names that do not indicate the characteristics of the disease. Also, there are diseases reported without Korean names. In order to make DisList better, the review committee for disease names should establish the regulations to review and register disease names, and establish a system to review new disease names before publishing papers.
Septobasidium sp.에 의한 구실잣밤나무 고약병의 분자학적 다양성 분석
이건우,서상태,차병진,한상섭,Geon-Woo Lee,Sang-Tae Seo,Byeongjin Cha,Sang-Sub Han 한국식물병리학회 2023 식물병연구 Vol.29 No.4
2020년 제주도 동백동산 내 구실잣밤나무 수피에 고약병과 관련된 Septobasidium sp.가 발견되었다. 분리한 균주는 습실 처리하여 새로 생성된 균사에 대한 genomic DNA를 추출한 뒤 internal transcribed spacer 및 small subunit rDNA 유전자에 대해 염기서열을 밝혔으며 polymerase chain reaction-based restriction fragment length polymorphism 분석을 통해 균주들간의 분자학적 특성이 조사되었다. 이 새로운 Septobasidium sp.은 기존에 알려진 고약병들과 형태학적 및 계통학적으로 다르게 나타나 새로운 종으로 보고한다. 또한 이 고약병은 관찰 당시 주변의 다른 수목들에서는 발생하지 않고 오직 구실잣밤 나무에서만 나타나는 특성으로 기주특이성이 매우 높다는 것이 확인되었다. In 2020, within the Dongbaekdongsan area in Jeju Island, a Septobasidium sp. associated with a felt disease in Castanopsis sieboldii (Makino) Hatus. ex T. Yamaz. & Mashiba was identified. The symptom included the presence of brown, thin, and silk-like mycelial mats attached to the tree's bark, displaying variations in size from large to small. To induce hyphal growth, the samples collected were incubated in a moist chamber, and the newly formed hyphae were subjected to genomic DNA extractions. The nucleotide sequences of the internal transcribed spacer and small subunit rDNA genes were determined, and molecular characteristics among the isolates were investigated through polymerase chain reaction-based restriction fragment length polymorphism analysis. This Septobasidium sp. exhibited distinct morphological and phylogenetic features compared to those that were previously reported in South Korea. Consequently, this strain is taxonomically classified as a provisionally novel species of Septobasidium. Furthermore, the observed felt disease exhibited a high degree of host specificity, as it was exclusively identified in C. sieboldii without occurrence in other tree species at the time of observation.