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Synthesis and Characteristics of FePt Nanopowder by Chemical Vapor Condensation Process
Yu Ji-Hun,Lee Dong-Won,Kim Byoung-Kee,Jang Tae-Suk 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
FePt binary-alloy nanopowder has been successfully synthesized by chemical vapor condensation process with two metal organic precursors, i.e., iron pentacarbonyl and platinum acetylacetonate. Average particle size of the powder was less than 50 nm with very narrow size distribution, revealing high dispersion capability. Characteristics of the powder could be controlled by changing process parameters such as reaction temperature, chamber pressure, as well as gas flow rate. Magnetic properties of the synthesized FePt nanopowder were investigated and analyzed in terms of the powder characteristics.
GUIDELINE : Severe influenza treatment guideline
( Won Suk Choi ),( Ji Hyeon Baek ),( Yu Bin Seo ),( Sae Yoon Kee ),( Hye Won Jeong ),( Hee Young Lee ),( Byung Wook Eun ),( Eun Ju Choo ),( Ja Cob Lee ),( Young Keun Kim ),( Joon Young Song ),( Seong 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.1
Growth pattern and ginsenoside production of auxininduced Panax ginseng rooots
YU Kee-Won(유기원),KIM Yun-Soo(김윤수),KIM Mee Hee(김미희),CHA Ahn Hee(차안희),JEONG Jae Woon(정재운),LEE Yong Wook(이용욱),Yun Seung Rho(윤승로),Choi Sung-Mee(최성미),Park Hee-Ju(박희주),Lee Sang-Jong(이상종),Son Sung-Ho(손성호),PAE 한국원예학회 1999 원예과학기술지 Vol.17 No.2
Yu, Kee-Won,Gao, Wen Yuan,Hahn, Eun-Joo,Paek, Kee-Yoeup 한국식물학회 2001 Journal of Plant Biology Vol.44 No.4
We investigated the effects on ginseng adventitious root growth and ginsenoside production when macro-element concentrations and nitrogen source were manipulated in the culture media. Biomass growth was greatest in the medium supplemented with 0.5-strength NH_4PO_3, whereas ginsenoside accumulation was highest (9.90㎎ g^-1 DW) in the absence of NH_4PO_3. At levels of 1.0-strength KNO_3, root growth was maximum, but a 2.0 strength of KNO_3 led to the greatest ginsenoside content (9.85㎎ g^-1). High concentrations of MgSO_4 were most favorable for both root growth and ginsenoside accumulation (up to 8.89㎎ g^-1 DW). Root growth and ginsenoside content also increased in proportion to the concentration of CaCl_2 in the medium, with the greatest accumulation of ginsenoside (8.91㎎ g^-1 DW) occurring at a 2.0 strength. The NH_4^+/NO_3^- ratio also influenced adventitious root growth and ginsenoside production; both parameters were greater when the NO_3^- concentration was higher than that of NH_4^+. Maximum root growth was achieved at an NH_4^+/NO_3^- ratio of 7.19/18.50, while ginsenoside production was greatest (83.37㎎ L^-1) when NO_3^- was used as the sole N source.
Production of Adventitious Ginseng Roots Using Biorectors
Yu, Kee-Won,Hahn, Eun-Joo,Paek, Kee-Yoeup The Korean Society of Plant Biotechnology 2000 식물생명공학회지 Vol.27 No.4
Panax ginseng is an important medicinal plant that has been used worldwide for geriatric, tonic, stomachic, and aphrodisiac treatments. Ginsenosides contained in the ginseng root are the main substances having active functions for human body. The price of ginseng is very expensive due to a complex process of cultivation, and the yield of ginseng is limited, which cannot meet the demand of the increasing market. Researchers have applied plant biotechnology to solve the problems but there are still things to be determined towards ginsenoside production by large-scale adventitious root culture. In this experiment, 5 to 20 liter bioreactors were employed to determine optimal conditions for adventitious root culture and ginsenoside production of Panax gineng. Callus was induced from the ginseng root on MS agar medium containing 1.0 mg. $L^{-1}$ 2,4-D and 0.1 mg. $L^{-1}$ kinetin. Then the callus was cultured on MS agar medium supplemented with 2.0 mg. $L^{-1}$ IBA, 0.1 mg. $L^{-1}$ kinetin, and 30 g. $L^{-1}$ to induce adventitious roots. The maximum root growth and ginsenoside production were obtained in 1/2 MS medium. 2.0 mg. $L^{-1}$ naphthalene acetic acid resulted in greater root growth than 2.0 mg $L^{-1}$ indole-3-butyric acid. Ginsenoside content increased with 2.0 mg. $L^{-1}$ benzyl adenin or kinetin. High concentrations of benzyl adenin (above 3.0 mg. $L^{-1}$ ) decreased the adventitious root growth and ginsenoside productivity. N $H_{4}$$^{+}$ inhibited the ginsenoside accumulation, while high concentrations of $K^{+}$, $Mg_{2}$$^{+}$, and $Ca_{2}$$^{+}$ increased it. N $H_{4}$$^{+}$ at 0.5 and 1.0 times of the normal amount in 3/4 SH medium resulted in the greatest biomass increase, but the highest ginsenoside productivity was obtained when N $O_{3}$$^{-}$ was used as the sole nitrogen source in the medium. Most microelements at high concentrations in the medium inhibited the root growth, but high concentrations of MnS $O_4$enhanced the root growth. Root dry weight increased with increasing sucrose concentrations up to 50 g. $L^{-1}$ , but decreased from 70 g $L^{-1}$ Ginsenoside productivity was maximized at the range of 20 to 30 g. $L^{-1}$ sucrose. In the experiment on bioreactor types, cone and balloon types were determined to be favorable for both adventitious root growth and ginsenoside production. Jasmonic acid was effective for increasing ginsenoside contents and Rb group ginsenosides mainly increased. These results could be employed in commercial scale bioreactor cultures of Panax ginseng.x ginseng.
Behaviour alteration of Topoisomerase IIIβ knockout mice
Yu Rim Kim,Eun Kyoung Kim,Young Sub Byun,Hae Rim Kim,Ju Sung Kang,Ju Young Lee,Min Young Lee,Sang Mi Cho,Ki Hoon Lee,Hoyoung Ghang,Won Kee Yoon,Young Suk Won,Hyoung Chin Kim,Young Hee Lee,Ki Hoan Nam 한국실험동물학회 2015 한국실험동물학회 학술발표대회 논문집 Vol.2015 No.8