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고상추출카트리지를 이용한 잔류농약 다중분석과정에서 정제용매에 따른 회수율 비교
두옥주,정보경,김경식,정의근,김진곤,김명희 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2
채소류 중 비교적 matrix효과가 적고, 수분 함량이 적절하여 회수율이 양호한 오이를 대상으로 하여 총 16종의 농약 성분을 A, B 두 group으로 나누어, 농약의 동시 다성분 분석의 전처리 과정 중 정제에 사용하는 용출용매로서 5%~20%의 acetone/hexane과 5%~20%의 ethyl acetate/hexane을 사용하여 각각의 회수율을 분석하여 얻은 결과는 다음과 같다. Acetone/hexane을 사용한 경우 5% acetone에서 총 16종의 농약 성분 중 ethalfluralin, trifluralin, chlorothalonil 등 11종의 농약은 높은 회수율을 보였으나, alachlor와 iprodione, endosulfan sulfate, bifenthrin, fenarimol은 매우 낮은 회수율을 나타내었고, 10% 이상의 acetone/hexane에서는 bifenthrin과 fenarimol 제외한 14종의 농약에서 높은 회수율을 얻을수 있었다. 그러나 bifenthrin은 20%의 acetone/hexane을 사용한 경우는 용출되지 않았고, fenarimol은 10% 이하의 acetone/hexane을 사용하였을 때는 낮은 회수율을 나타냈었다. Ethyl acetone/hexane을 사용하여 총 16 종의 농약 성분의 회수율 분석을 한 결과, 5% ethyl acetone에서 ethalfluralin, α-endosulfan, β-endosulfan (A group), vinclozolin, tetradifon, cyprethrin, fenvalerate (B group)에서만 70% 이상의 회수율을 얻었다. 10%의ethyl acetone/hexane을 사용하여 분석한 경우는 trifuralin, chlorothalonil, α-endosulfan, β-endosulfan, endosulfan sulfate(A group), vinclozolin, procymidone, tetradifon, cypermethrin, 그리고 fenvalerate(B group) 에서는 70% 이상의 회수율을 얻었고, 20%의 cthyl acetone/hexane 을 사용하여 분석한 경우는 5%나 10%의 ethyl acetone/hexan 을 사용하여 분석했을 때보다 좋은 결과를 나타내어 전체 16종의 농약 중 14종에서 75% 이상의 회수율을 얻었으나, alachlor와 bifenthrin은 매우 낮은 회수율을 보여서 ethyl acetate 와 hexane의 혼합용매가 이들 두 농약성분의 분석에는 적합하지 않은 용출 용매임을 알 수 있었다. A study was carried out to optimize the cleanup step using a solid-phase extraction (SPE) cartridge, SupelClean^(TM) Florisil, for multiresidue analysis of 16 pesticides in cucumber matrix. Eluting efficiencies of two solvent systems including acetone/n-hexane and ethyl acetate/n-hexane mixtures were critically evaluated by recoveries of target anaytes from the SPE Florisil column. Based on the recovery as a measure of eluting efficiency, an acetone/n-hexane (20/80,v/v) mixture provided more than 80% recovery for 15 pesticides except bifenthrin. In case of ethyl acetate/n-hexane, 14 pesticides showed recoveries higher than 75%, while those for alachior and bifenthrin were less than 30%.
학령후기 남아의 체형분석에 따른 길(Bodice) 원형에 관한 연구 : 제1보 Part Ⅰ
함옥상,이경남 한국의류학회 2002 한국의류학회지 Vol.26 No.6
This study is to classify somatotypes of the upper class boys in elementary school. The study is conducted through anthoropometric measurements and photometric measurements. The subjects are 320 boys in the age group of io to a years old. The following conclusions are drawn from this study. 1. The height items are increased along with age increase. The increases in the factors, which specify vertical sizes such as height and length, are a little larger than those of breadth, depth, and girth, which specify horizontal sizes. 2. The factor analysis on anthropometric measurements and photometric measurements reveals five somatic composition factors and those factors comprised 79.60% of total variance. 3. The torso shapes of the upper class boys in elementary school are classified into three categories. The first type is taller and heavier than the average elementary school upper class boys and has the highest rising shoulders. The shape of the back is about average and the chest is developed above average. The curvature of the lower back is gentle and lower abdomen protrudes the most of the three types. The second type is tall and slightly heavier than average and shoulders are raised a little. The shoulder blades protrude about average and the curvature of lower back is the most developed of all. The chest is developed about average and the abdomen is a little protruding. The third type is the most common with the smallest height of the three and skinny with dropped shoulders. The chest is somewhat flat and the shoulder blades protrude about average.
한국 노인의 인구,사회경제적 수준 및 구강건강행위와 치주질환 유병과의 관련성
정정옥 ( Jung Ock Jung ),오경재 ( Gyung Jae Oh ) 대한예방치과·구강보건학회 2011 大韓口腔保健學會誌 Vol.35 No.1
Objectives. This study was designed to examine the effects of socioeconomic status and oral health behaviors on periodontal diseases in the elderly Korean population, to determine whether any inequalities in oral health status exist depending on socioeconomic status, and ultimately to provide essential data for national healthcare policies intended to effectively reduce the inequalities. Methods. The raw data collected from `` The Fourth Korean National Health and Nutrition Examination Survey (KNHANES) 2007`` was analyzed in this study. The subjects included in this study were seven hundred and seventy eight (778) elderly people, aged 65 years or older and who had completed the oral examination, health questionnaires and nutrition examination. Results. First, analyses of differences in the prevalence of periodontal diseases depending on socioeconomic status showed that the prevalence of periodontal diseases increases with age and also the prevalence of periodontal diseases is relatively higher in the residents of rural communities such as Eup or Myeon. Second, analyses of differences in the prevalence of periodontal diseases depending on oral health behaviors indicated that a lower frequency of eating between meals leads to a higher prevalence of periodontal diseases. Finally, regarding the magnitude of effects of socioeconomic status and oral health behaviors on periodontal diseases, it was found that both these factors (i.e., socioeconomic status and oral health behaviors) have significant effects on periodontal diseases. However, specifically socioeconomic status has more significant effects on periodontal diseases. Conclusions. In conclusion, it was revealed that considerable inequalities exist in the prevalence of periodontal diseases depending on socioeconomic status in the elderly population, and both the factors of socioeconomic status and oral health behaviors correlate with the prevalence of periodontal diseases. Specifically, the results of this study suggest that the effects of socioeconomic status on periodontal diseases are more significant than the effects of oral health behaviors, and oral health behaviors by themselves closely correlate with socioeconomic status.
Park, Joonghyuk,Ahn, Young Ock,Nam, Jeong-Won,Hong, Myoung-Ki,Song, Namsook,Kim, Taejoon,Yu, Gyung-Hee,Sung, Soon-Kee Academic Press 2018 Pesticide biochemistry and physiology Vol.152 No.-
<P><B>Abstract</B></P> <P>We conducted biochemical and physiological experiments to investigate the mode of action of tiafenacil (Terrad'or™), a new protoporphyrinogen IX oxidase (PPO)-inhibiting pyrimidinedione herbicide. Analysis of the half-maximal inhibitory concentration (IC<SUB>50</SUB>) against recombinant PPO enzymes from various plant species, including amaranth (<I>Amaranthus tuberculatus</I>), soybean (<I>Glycine</I> max), arabidopsis (<I>Arabidopsis thaliana</I>), and rapeseed (<I>Brassica napus</I>), showed that tiafenacil had an IC<SUB>50</SUB> of 22 to 28 nM, similar to the pyrimidinedione herbicides butafenacil and saflufenacil and the <I>N</I>-phenylphthalimide herbicide flumioxazin. By contrast, tiafenacil exhibited 3- to 134-fold lower IC<SUB>50</SUB> values than the diphenyl ether herbicides fomesafen, oxyfluorfen, and acifluorfen. Tiafenacil is non-selective and is herbicidal to both dicots and monocots, such as the weeds velvetleaf (<I>Abutilon theophrasti</I>), amaranth, and barnyardgrass (<I>Echinochloa crus-galli</I>) as well as the crops soybean, rapeseed, rice (<I>Oryza sativa</I>), and maize (<I>Zea mays</I>) at concentrations ranging from 1 to 50 μM. Treatment of plant tissue with tiafenacil in darkness resulted in the accumulation of protoporphyrin IX. Subsequent exposure to light increased the content of malondialdehyde and significantly decreased the Fv/Fm values of chlorophyll fluorescence. The results suggest that tiafenacil is a new PPO-inhibiting pyrimidinedione herbicide.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the mode of action of tiafenacil (Terrad'or™). </LI> <LI> This new pyrimidinedione herbicide inhibits protoporphyrinogen IX oxidase. </LI> <LI> Tiafenacil had a much lower IC<SUB>50</SUB> values than diphenyl ethers. </LI> <LI> Tiafenacil is non-selective and herbicidal against both monocots and dicots. </LI> <LI> Tiafenacil causes protoporphyrin IX accumulation and oxidative damage to plants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
천연 알긴산을 지지체로 한 삼차원 배양에서 연골세포의 생존력
류유정 ( You Jeong Lyou ),김상경 ( Sang Gyung Kim ),최연희 ( Yeon Hee Choi ),최정윤 ( Jung Yoon Choe ),김채기 ( Chae Gi Kim ),김종기 ( Jong Ki Kim ),윤연희 ( Yeon Hee Yoon ),신임희 ( Im Hee Shin ),박상옥 ( Sang Ock Park ) 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.3
Objective: Articular cartilage has a highly limited capacity to repair because of lack of blood supply. There have been no effective modality to regenerate the articular cartilage and prevent degenerative changes. It is necessary to proliferate the cells in vitro, however the cells lose their phenotype during in vitro monolayer culture. Although it is not enough to increase the number of the cells in the three dimensional culture, it is a effective way to maintain their original phenotype expression. Alginate has been used as a good source of scaffold in chondrocyte three dimensional culture. The objective of this study was to find the most favorable scaffold for chondrocyte viability among various alginate extracted from natural source in chondrocyte three dimensional culture. Methods: The alginate extracted from brown seaweed, Undaria pinnatifida and sea tangle, Laminaria japonica inhabitating near Korean sea and commercially available alginate were used. Chondrocytes isolated from adult pig were used. Three kinds of chondrocyte-alginate bead were made and incubated for forty-four days. Cellular viability and glycosaminoglycan (GAG) content were measured and compared. SPSS Version 10.0 was used for data analysis. Results: Viability of chondrocyte and GAG content were increased as a function of time. Alginate from brown seaweed, U. pinnatifida appeared more favorable to maintain chondrocyte viability than others. The total GAG content was similar among three kinds of alginate Conclusion: Alginate extracted from natural see weed, especially brown seaweed, may be a good source to maintain chondrocyte viability in three dimensional culture.
시험연소결과에 근거한 플라즈바 아크방식 유리화 시험 설비의 제염성능 평가(I) - 배기가스중의 유해중금속, 방사성핵종 모의물질 및 방사성핵종 제염특성 -
채경선,박윤환,민병연,장재옥,박준용,정원익,문병식,Chae, Gyung-Sun,Park, Youn-Hwan,Min, Byong-Yun,Chang, Jae-Ock,Park, Jun-Yong,Jeong, Weon-Ik,Moon, Byung-Sik 대한방사선방어학회 2000 방사선방어학회지 Vol.25 No.2
Through the results of off-gas analysis at 3 sampling points in Plasma Arc Melting vitrification pilot plant, it was evaluated the partitioning of spiked materials in off-gas and the decontamination characteristic of off-gas treatment system. Spiked materials are hazard_us heavy metals(Pb, Cd, Hg), radioactive surrogate(Co, Cs) and radioactive materials($^{60}Co,\;^{137}Cs$). Through the Trial burn tests, Decontamination factor of spiked materials in off-gas treatment system is calculated. 플라즈마 아크 용융방식 유리화 시험설비의 계통내 기체 및 최종배출구 전단의 배기체를 분석함으로써 배기체중에 포함된 분석용 첨가물의 거동 및 배기가스 처리장치의 제염성능을 평가하였다. 중금속 물질(Pb, Cd, Hg), 방사성 모의물질(Co, Cs) 그리고 방사성핵종($^{60}Co,\;^{137}Cs$)을 분석용 첨가물로 사용한 실험결과로부터 첨가물질의 거동에 따른 유리화 설비 배기체처리시스템의 제염특성 및 제염제수를 구하였다.