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Candida albicans에 대한 생약의 항진균성에 관한 연구(Ⅰ)
유승조(Seung Cho Yoo),서정식(Jung Sik Suh) 한국생약학회 1974 생약학회지 Vol.5 No.3
Some crude drugs in ancient literatures have been used as traditional therapeutic agent of leucorrhea mainly caused by Trichomonas vaginalis and Candida albicans. Sixty six kinds of crude drugs in ancient literatures and ten constituents were selected as sample drugs. Trichomycin standard was tested to compare with the above drugs. To determine the antifungal effect of these drugs on Candida albicans Yu 1200, a test organism, screening test was conducted. Antifungal activities of crude drug water extracts were observed by means of two test methods : firstly through the agar slant method and secondly the counting chamber method which was used for acknowledged drug agents upon the result of the agar slant method. And in order to improve the fungicidal effect, the organisms were stained with 0.02% methylene blue solution. The results of the above test indicated that Fritillariae Rhizoma has antifungal action in the concentration of 310mcg/㎖, Coptidis Rhizoma in 620mcg/㎖. Meliae Cortex, Scutellariae Radix both in 5.000mcg/㎖. Baicalin, catechol among the pure isolated constituents inhibited in the range of 50mcg/㎖. This score was based on 50% inhibition in comparison with amounts of control organisms. Rhei Rhizima, Mori Radicis Cortex, Linderae Radix, and Amomi globosi Fructus showed the antifungal effect moderately in 5,000 mcg/㎖, and baicalein and pectolinarin in 50 mcg/㎖ in the limit of between 35% and 50% antifungal activity. Staining with 0.02% methylene blue showed that any of the crude drug extracts was unable to stain the cells, but trichomycin in 0.86 unit/㎖ able to stain 12% of the cells. This result means that crude drugs probably do not have fungicidal but fungistatic action.
참깨 開花ㆍ登熟에 關한 硏究11, 草型 別 發育에 따른 光合成 및 關聯 特性 差異
Chui Whan Kang(姜哲煥),Byung Chan Chung(鄭柄贊),Jung Sik Suh(徐貞植) 한국육종학회 1994 한국육종학회지 Vol.26 No.3
Studies were performed to investigate the difference in photosynthesis and related characteristics according to different plant types;growth stage and leaf position in sesame. Three different plant-type varieties were selected from Korean recommended sesame cultivars and used as materials. Average photosynthesis during whole growing period was 1.64 CO₂ ㎎/d㎡/hr. Few-branched type variety “Kwangsankkae” showed 2.006 CO₂ ㎎/d㎡/hr which was the highest one among three plant types. Upper part leaves at maturing stage showed the highest photosynthesis and the next followed with the order of middle part leaves at maturing stage;and leaves of seedling stage. Average chlorophyll content of single leaf through the whole growing period was 3.31 ㎎ per 100㎠ of leaf area(LA) and was highest in few-branched type variety “Kwangsankkae”. Upper part leaves at maturing stage showed the highest chlorophyll content of 4.39 ㎎/100 LA. Average area of single leaf through the whole growing period was 16.5㎠. Middle part leaves at maturing stage in branched type variety “Hansumkkae” showed the highest chlorophyll content among plant types and growing stages. Average specific leaf weight(SLW) during the growing period was 0.0033. The upper part leaves at maturing stage in branched type variety “Hansumkkae” revealed the heaviest one. Average specific leaf area(SLA) during whole growing period was 275 and was highest in the leaves of non-branohed type variety “Danbaeckkae” at seedling stage. Dry weight ratio;SLW and chlorophyll content were positively associated with photosynthesis;while leaf area;fresh and dry leaf weight were negatively correlated with photosynthesis.
유한요소 해석을 통한 CTBA Trailing Arm의 용접부 잔류응력 평가 및 용접 공정 최적화
김종성(Jong-sung Kim),임인혁(In-hyeok Im),김정섭(Jung-sub Kim),서정식(Jung-sik Suh) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.4
Residual stress that occurs during welding is also a negative impact on the stability by lowering the durability of the vehicle. In addition, deformation due to the heat generated at this time causes a problem in the assembly of the vehicle body. In order to minimize deformation and residual stress caused by welding, it may be change the welding sequence, or using further processing (such as pinning). But adding process (such as pinning) after the welding process is not suitable for mass production because the budget and the total process time increasing. Therefore, in the study, it was studied on the residual stress of the product (Rear CTBA trailing Arm) to prevent excessive deformation and reduced durability. We have also studied the deformation and residual stresses of products to a minimum for optimal welding procedures. As a result, welding deformation was occurred the maximum deformation about 3.85 mm at the ends of the beam and residual stress was occurred greater than 500 MPa in the heat affected zone. It is also found that the overhead welding process is the optimum welding process.
김성곤,서정식,이만정 한국농화학회 1992 Applied Biological Chemistry (Appl Biol Chem) Vol.35 No.5
Effect of dry-heat treatment (130∼220℃) on properties of corn starch was investigated. No significant changes of surface color and swelling power were observed. Blue value, water-binding capacity, solubility and degree of hydrolysis by acid or glucoamylase were increased; however, intrinsic viscosity and crystallinity were decreased as heating temperature was raised. Noticeable changes occurred between 170∼190℃.