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호흡쇄의 NADH - ubiquinone oxidoreductase 저해제인 합성 piericidin 유사체들의 살균활성
조광연,정근회,다까하시노부다까,요시다시게오 한국농화학회 1990 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.3
Representative synthetic piericidin-like compounds, such as hydroxypyridine and hydroxyquinoline derivatives, which showed high inhibition activity against NADH-ubiquinone oxidoreductase on the respiratory chain revealed good fungicide activity. Especially, hydroxypyridine ores showed high activity against rice blast (Pyricularia oryzae) and barley powdery mildew (Erysiphe graminis) (Received August l3, accepted September 20, 1990).
조광연,김경자 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.10
By heat treating coal tar pitch between 450∼500$^{\circ}C$, mesophase pitch could be obtained. Subsequently, this pitch was oxi-stabilized between 160∼240$^{\circ}C$ in air for the purpose of reducing swelling and distortion. The mechanism of stabilization was analysed using the thermo-gravity and FT-IR. To investigate the effect of oxi-stabilization, the shore hardness and bending stress were measured with carbonized green body which was made from oxi-stabilized coal tar pitch. 콜타르 피치를 450∼50$0^{\circ}C$로 가열하여 메조페이스 피치를 제조하였다. 열처리된 피치는 시편의 부풀림과 변형을 줄이기 위해 공기 중 160∼24$0^{\circ}C$로 산화안정화하였다. 고온열처리핏치를 이용한 부피를 가진 성형체의 산화안정화 원리를 조사하기 위해 열중량감소, FT-IR을 측정하였다. 부피를 가진 성형체에 대한 산화안정화의 영향은 쇼아경도, 곡강도를 측정하여 파악하였다.
조광연,류도형,허승헌,신동근,김현이,정해원,조성백 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.8
The electrolyte separator for thermal battery should be easily handled and loaded a large amount of the molten salt. Ceramic fibers, especially fibrous commercial glass filters were used as an electrolyte separator and the lithium based molten salts were infiltrated into the ceramic filters. The pore structures of the ceramic filter and the melting properties of the lithium salts affected to the electrolyte loading and leakage. During the infiltration, ions of Li+ and F- in the molten salts were reacted with the glass fiber and caused to be weaken the fiber strength. The electrolyte separator for thermal battery should be easily handled and loaded a large amount of the molten salt. Ceramic fibers, especially fibrous commercial glass filters were used as an electrolyte separator and the lithium based molten salts were infiltrated into the ceramic filters. The pore structures of the ceramic filter and the melting properties of the lithium salts affected to the electrolyte loading and leakage. During the infiltration, ions of Li+ and F- in the molten salts were reacted with the glass fiber and caused to be weaken the fiber strength.
토양으로부터 분리한 곰팡이에 의한 γ-Linolenic Acid 생산
조광연,이철우 한국식품영양학회 1995 韓國食品營養學會誌 Vol.8 No.1
100개의 토양시료로부터 120종의 곰팡이를 분리하여 이 중 GLA 생성능이 가장 우수한 균주를 선발하여 Fusarium 속으로 동정하였다. Fusarium 속이 생산하는 균체량과 지방질 함량은 각각 620㎎/100㎖, 63.5㎎/100㎖ 이었으며 전체 지방산 중 GLA가 차지하는 함량은 약 10.2% 이었다. 120 fungal strains producing γ-linolenic acid(GLA) were isolated from 100 soil samples, and among these, the most suitable one for the production of GLA was identified as Fusarium sp. JK-02. The content of total lipid and dry cell weight was 620㎎/100㎖ and 63.5㎎/100㎖, respectively. The production of GLA was 10.2% of the total fatty acids.
조광연,류도형,허승헌,신동근,김현이,최종화,정해원,Cho, Kwang-Youn,Riu, Doh-Hyung,Huh, Seung-Hun,Shin, Dong-Geun,Kim, Hyoun-Ee,Choi, Jong-Hwa,Cheong, Hae-Won 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.7
Ceramic Fiber separator is the promising material for thermal battery system because it reduces the production cost and offers the potential to a new application compared to a pellet type electrolyte. The molten salt electrolytes for thermal battery were prepared by the impregnation of the commercial glass filters such as GF-A, C and F (Whatman, USA) with two types of molten-lithium salts, LiCl-KCl and LiK-LiBr-LiF. The wetting properties were evaluated by wetting balance test and wetting angle measurement. The wetting behaviors were strongly affected by the composition of the molten salts and the pore structure of the glass separators. The optimum wetting conditions for maximum loading and effective retention of the molten electrolyte were also studied.
조광연,정종헌,오원춘 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.5
Azithromycin is one of the most concentrated antibiotics in wastewater, as conventional wastewater treatment facilities cannot eliminate this antibiotic from the environment. In this study, we proposed using a graphenebased mesoporous electrochemical sensor to take simultaneous voltammetric measurements of azithromycin. Because of its homogeneous pore structure, large surface area, quick electron transfer rate, and superior biocompatibility, magnesium-containing mesoporous silica is a promising resource for the immobilization of biomolecule matrix. Ca2+-doped MgAl2O3-G-SiO2 was used to build an amperometric biosensor through a self-assembly process. At room temperature in a buffer solution with a pH of 7.0, the modified electrode under ideal circumstances displayed good azithromycin sensing activity, a linear range of 1 to 5 μmolL-1, a detection limit of 0.5 μmolL-1, and a reaction time of less than 2 sec. An array of morphological analysis methods—including X-ray diffraction methos, scanning electron microscopy, Brunauer-Emmett-Teller method, high resolution tunneling electron microscopy, Raman, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy— was used to examine the nanocompositeʼs crystalline structure. Cyclic voltammetry was used to determine the sensing effects in the mesoporous active nanomaterials. Finally, it was found that the electrochemical sensor performed as an ideal biosensor that was able to detect azithromycin in the presence of several interfering species with high stability, selectivity, and repeatability.
조광연,김경자,정윤중 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.10
탄소재의 수지함침은 탄소재 표면 상태에 영향을 받는다. Coupling처리에 의한 탄소재 표면처리는 수지와의 호환성과 젖음성을 개선시켜 함침효율과 물성을 향상시킨다. 본 연구에서는 표면개질을 위해 탄소재를 실란 coupling 처리하였다. FT-IR 관찰결과 실라놀은 탄소재 표면에 단층으로 코팅되었음을 확인하였다. 탄소재의 coupling 처리는 함침효율을 향상시켜 기공율, 기계적 강도, 밀도, 마찰거동이 개선되었다. Resin impregnation of carbon materials was affected by surface of carbon materials. The surface of carbon materials with coupling treatment improved comparability and wettability with resin, and that increased impregnation efficiency and properties of carbon materials. As a results of FT-IR, The silanol was coated on carbon surface with one layer. Coupling treatment of carbon materials increased impregnation efficiency, which improved porosity, mechanical strength, density and friction behavior.
석탄계 피치에 요오드를 소량 첨가하여 제조한 탄소복합재의 치밀화 거동
조광연,류도형,신동근,주혁종,구형회,박인서,Cho, Kwang-Youn,Riu, Doh-Hyung,Shin, Dong-Geun,Joo, Heyok-Jong,Koo, Hyung-Hoi,Park, In-Seo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
We investigated the viscosity behavior and the carbon yield of coal tar pitch (CTP) treated with iodine. The viscosity of iodine treated pitch showed that the fluidity of iodine treated CTP did not increase within the iodine addition of 1.4%. DTG analysis showed that cross linking was accelerated at the temperature range from $400\;to\;500{^{\circ}C}$ with iodine treatment, which is due to the accelerated dehydrogenative reaction by iodine. The iodine treatment was mainly effective for β-resin content increase of CTP. The carbon yield of CTP increased from 40 to 60% by the iodine non-treated CTP.