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菜蔬栽培地 土壤과 菜蔬類의 有機鹽素系 殺蟲劑의 殘留評價
金喜權,徐鎔澤,沈在漢 全南大學校 農漁村開發硏究所 1984 農業科學技術硏究 Vol.19 No.-
菜蔬栽培土壤과 菜蔬類의 有機鹽素系 殺蟲劑의 殘留量을 評價하기 爲하여 GLS로 分析하여 얻은 結果는 다음과 같다. 土壤總平均殘留量은 상치土壤(0.166ppm), 시금치土壤(0.158ppm), 마늘土壤(0.105ppm), 쑥갓土壤(0.095ppm), 고구마土壤(0.080ppm), 배추土壤(0.063ppm), 아욱土壤(0.046ppm), 토마토土壤(0.027ppm) 順으로 높았다. 菜蔬의 總平均殘留量은 상치(0.038ppm), 시금치(0.022ppm), 마늘(0.015ppm), 아욱(0.013ppm), 고구마葉(0.012ppm), 당근(0.009ppm), 오이(0.008ppm), 배추(10.007ppm), 쑥갓(0.002ppm), 토마도(0.002ppm)順으로 높았으며, 土壤中의 總平均殘留量이 菜蔬中의 總平均殘留量보다 5~10倍 높았다. 菜蔬中의 總平均殘留量은 土壤中의 總平均殘留量에 比例하였다. α-BHC, γ-BHC는 土壤試料 및 菜蔬試料 全體에서 檢出되었다. 한편 PCNB, heptachlor, p, p'-DDE, dieldrin은 土壤試料에서는 平均殘留量 範圍가 栽培作物에 따라 各各 ND~0.004ppm, 0.001~0.017ppm, T~0.031ppm, T~0.032ppm이었으나 菜蔬試料에서는 거의 檢出되지 않았다. 供試菜蔬의 BHC, DDT汚染이 廣範圍하였지만 全體的인 殘留分의 水準은 FAO/WHO가 奬勵한 食品中 BHC, DDT 殘留許容限度인 0.5ppm, 1.0~7.0ppm에는 훨씬 未達하였다. Evaluation of levels of organochlorine pesticide in vegetables and agricultural soil samples were analysed by GLC equipped with electron capture detector. The result obtained were summarized as follows; Total mean residues of organochlorine pesticide in soil increased in the order of tomato soil(0.27ppm), cucumber soil(0.042ppm), marsh mallow soil(0.046ppm), cabbage soil(0.03ppm), sweet potato soil(0.080ppm% carrot soil(0.090ppm), crown daisy soil(0.095ppm), garlic soil(0.105ppm), spinach soil(0.158ppm), and lettuce soil(0.166ppm). Total mean resideues of organochlorine pesticide in vegetables increased in the order of crown daisy(0.002ppm), tomato(0.002ppm), cabbage(0.007ppm), cucumber(0.008ppm), carrot(0;009ppm), sweet potato leaf (0.012ppm.) marsh mallow(0.013ppm) garlic(0.015 ppm) and lettuce(0.038ppm). Levels of residue in soil was 5~10 times higher than those of vegetables. The similar trend appeared between levels of residue in soil and those of vegetables. α-BHC and γ-BHC were detected in all soil and vegetable samples. The mean residue levels of PCNB, heptachlor, p, p'-DDE and dieldrin in all soil samples were ND~0.004ppm, 0.001~0.017ppm. T~0.031ppm and T~0.032ppm, respectively, but those of in vegetable samples were hardly detected. In spite of high detection frequencies of BHC and DDT in vegetables, the levels of BHC and DDT pesticide residue in vegetables were found fairly low and were far lower than the tolerences for respective vegetables recommended(0.50ppm, 1.0~7.0ppm) jointly by FAO and WHO of United States.
Dehydrogenative Polymerization of New Alkylsilanes Catalyzed by ??
우희권,송선정 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-
새로운 알킬 실란의 3-aryl-1-silabutanes 1-4을 합성하고 6족 전이금속 착물인 ??을 사용하여 탈수소 중합을 시켰다. 전이금속 4족 착물인 metallocene계 촉매에 비해 분자량이 현저히 증가된 실리콘 고분자를 얻을 수가 있었다. 6족 전이금속 촉매에 의한 탈수소 중합 메카니즘을 제시하였다.
Gweon, Hyun-Soo,Sung, Hee-Ja,Lee, Dae-Hee The Korean Nutrition Society 2010 Nutrition Research and Practice Vol. No.
The precise effects of protein intake on fractional synthesis rate (FSR) of muscle protein are still under debate. The sample size of these studies was small and the conclusions in young and elderly subjects were inconsistent. To assess the effect of dietary protein intake on the FSR level, we conducted a meta-analysis of controlled protein intake trials. Random-effects models were used to calculate the weighted mean differences (WMDs). Ten studies were included and effects of short-term protein intake were evaluated. In an overall pooled estimate, protein intake significantly increased the FSR (20 trials, 368 participants; WMD: 0.025%/h; 95%CI: 0.019-0.031; P < 0.0001). Meta-regression analysis suggested that the protein dose was positively related to the effect size (regression coefficient = 0.108%/h; 95%CI: 0.035, 0.182; P = 0.009). A subgroup analysis indicated that protein intake significantly increased FSR when the protein dose was ${\leq}$ 0.80 g/kg BW (16 trials, 308 participants; WMD: 0.027%/h; 95%CI: 0.019-0.031; P < 0.0001), but did not affect FSR when the protein dose was > 0.80 g/kg BW (4 trials, 60 participants; WMD: 0.016%/h; 95%CI: 0.004-0.029; P = 0.98). In conclusion, this study is the first integrated results showing that a short-term protein intake is effective at improving the FSR of muscle protein in the healthy elderly as well as young subjects. This beneficial effect seems to be dose-dependent when the dose levels of protein range from 0.08 to 0.80 g/kg BW.
Polymerization of Hydrosilanes and Vinyl Monomers in the Presence of Transition Metal Complex
Myoung-Hee Kim, Jun Lee, Hyo Chang Cha, Joong-Hyeok Shin, Hee-Gweon Woo 조선대학교 기초과학연구원 2009 조선자연과학논문집 Vol.2 No.1
This minireview provides the chosen examples of our recent discoveries in the polymerization of hydrosilanes, dihydrosilole, lactones, and vinyl derivatives using various catalysts. Hydrosilanes and lactones copolymerize to give poly(lactone-co-silane)s with Cp2MCl2/Red-Al (M = Ti, Zr, Hf) catalyst. Hydrosilanes (including dihydrosilole) reduce noble metal complexes (e.g., AgNO3, Ag2SO4, HAuCl4, H2PtCl6) to give nanoparticles along with silicon polymers such as polysilanes, polysilole, polysiloxanes (and silicas) depending on the reaction conditions. Interestingly, phenylsilane dehydrocoupled to polyphenylsilane in the inert nitrogen atmosphere while phenylsilane dehydrocoupled to silica in the ambient air atmosphere. Cp2M/CX4 (M = Fe, Co, Ni; X = Cl, Br, I) combination initiate the polymerization of vinyl monomers. In the photopolymerization of vinyl monomers using Cp2M/CCl4 (M = Fe, Co, Ni), the photopolymerization of MMA initiated by Cp2M/CCl4 (M = Fe, Co, Ni) shows while the polymerization yield decreases in the order Cp2Fe > Cp2Ni > Cp2Co, the molecular weight decreases in the order Cp2Co > Cp2Ni > Cp2Fe. For the photohomopolymerization and photocopolymerization of MA and AA, the similar trends were observed. The photopolymerizations are not living. Many exciting possibilities remain to be examined and some of them are demonstrated in the body of the minireview.
Polymerization of Acrylic Acids by Chlorocarbon/Metallocene Combination Initiator
Woo, Hee-Gweon,Kim, Bo-Hye,Cho, Myoung-Shik,Kim, Min-Sook,Chung, Yun-Gil,Ham, Heui-Suk,Paek, Choon-Seon,Hwang, Teak-Sung,Jun, Moo-Jin,Li, Hong Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.9
Dehydrogenative Polymerization of Hydrosilanes to Silicon Polymers
Myoung-Hee Kim, Jun Lee, Soo-Yong Mo, Jong-Hyun Kim, Hee-Gweon Woo 조선대학교 기초과학연구원 2010 조선자연과학논문집 Vol.3 No.2
Hydrosilanes possessing reactive Si-H bond are used in synthesizing various types of polysilanes by dehydrocoupling under the influence of various organometallic promoters.42 Catalytic Si-Si/Si-O coupling of hydrosilanes with hydrosilanes, alcohols, and lactones to silicon-based polymers are described in this article as selective examples of our recent research developments. These silicon-containing polymers can be used as a precursor to prepare useful functional materials for fabricating electronic devices.