• 농약과학회지
• /
• 제10권4호
• /
• pp.296-305
• /
• 2006

토양 중 pencycuron의 온도, 수분함량 및 토성에 따른 흡착, 잔류 특성을 구명하고자 실내 및 포장실험과 환경의 영향에 대하여 실험을 수행하였다. 2종 토양에서 진탕 시간과 약제의 흡착량사이에 높은 유의성이 있는 power function의 상관관계가 인정되었다. 흡착속도는 진탕 1시간 이내에 사질식양토에서 최대 흡착량의 60%가, 미사질식양토에서 65%가 흡착되었고, 12시간 후에는 의사평형에 도달하였다. Pencycuron의 농도별 흡착은 Freundlich 등온식에 부합되었으며, 흡착분배계수 $K_d$값은 사질식양토에서 2.31, 미사질식양토에서 2.92었다. 토양 중 유기탄소에 대한 분배계수 $K_{oc}$는 사질식양토에서 292.9이었고, 미사질식양토에서 200.5이었다. 흡착강도 및 비선형도를 성명하는 상수값은 사질식양토에서 1.45, 미사질식양토에서 1.68이었다. 실내 실험에 있어서 pencycuron의 잔류는 1차 반응식에 부합되었고, 반감기는 $12^{\circ}C{\sim}28^{\circ}C$에서 95일${\sim}$20일로, 토양 수분함량이 포장용수량의 $30{\sim}70%$인 토양에서 38일에서 21일로 짧아졌다. 토양 종류에 따른 pencycuron의 반감기는 토성이 현저히 달랐음에도 사질식양토에서 25일, 미사질식양토에서 22일로 나타났다. 포장 실험에서도 pencycuron의 반감기는 사질식양토에서 26일, 미사질식양토에서 23일이었다. 포장에서 10%까지 잔류되는 기간은 미사질식양토에서 57일, 사질식양토에서 69일로 나타났다.

• 한국지역사회생활과학회지
• /
• 제15권4호
• /
• pp.113-125
• /
• 2004

The objective of this study was to analyze the evaluation of the rural resident's on their community at view of community life satisfaction. The specific purposes of this study were to identify the degrees of community life satisfaction, consciousness of rural community according to the individual variables. The data were gathered from 1,870 rural residents by the structured interview in the 187 communities sampled by multi-staged cluster stratified sampling method in November, 2003. The major findings of this study were as follows; first, the degree of the rural residents'community life satisfaction was generally low, especially the rural residents were dissatisfied with the opportunities of leisure and education environment in their communities, and by half were satisfied with housing environment. Second, as consciousness of rural community, the degree of rural resident's joining at community meeting was high, and openness to the outside residents' was high. third, the most important factor for consciousness of rural community were community organization, good neighbor. As result of this study, the following conclusion and recommend can be drawn. First, the level of rural resident's community life satisfaction is overall low. Especially it is needed policy efforts and priority investment for advancing satisfaction on leisure and education environment in rural community. Second, to foster rural resident's community consciousness, community orgaruzatlon Is first of all supported and activated. Through viability of these community organization, rural resident's participation in community welfare will be enhanced

• Nutrition Research and Practice
• /
• 제5권1호
• /
• pp.11-19
• /
• 2011

Eotaxin is an important inflammatory chemokine in eosinophil chemotaxis and activation and, thus, is implicated in asthma. Recently, obesity was associated with an increased prevalence of asthma, but the relationship between obesity and eotaxin expression has only been partially understood in obese mice and human studies. Therefore, we studied the expression patterns of eotaxin in 3T3-L1 preadipocytes/adipocytes to determine whether eotaxin levels are influenced by body weight gain and/or reduction in diet-induced obese mice. First, we investigated eotaxin expression during differentiation in 3T3-L1 adipocytes. Then, we treated 3T3-L1 preadipoeytes/adipoeytes with tumor necrosis factor-alpha (TNF-${\alpha}$), eotaxin, interleukin (IL)-4, IL-5, or leptin. To examine the effects of weight loss in high-fat diet induced obese mice, we fed C57BL/6 mice a high-fat diet or a normal diet for 26 weeks. Then, half of the high-fat diet group were fed a normal diet until 30 weeks to reduce weight. Epididymal adipose tissue, visceral adipose tissue, serum, and bronchoalveolar fluid of mice were examined for eotaxin expression. The results showed that eotaxin expression levels increased with adipocyte differentiation and that more eotaxin was expressed when the cells were stimulated with TNF-${\alpha}$, eotaxin, IL-4, IL-5, or leptin. An in vivo study showed that eotaxin levels were reduced in visceral adipose tissues when high-fat diet fed mice underwent weight loss. Taken together, these results indicate a close relationship between eotaxin expression and obesity as well as weight loss, thus, they indirectly show a relation to asthma.

• Journal of Microbiology and Biotechnology
• /
• 제25권1호
• /
• pp.33-43
• /
• 2015

GAM-1 and GAM-2, two themostable glucoamylases from Aspergillus niger B-30, possess different molecular masses, glycosylation, and thermal stability. In the present study, the effects of additives on the thermal inactivation of GAM-1 and GAM-2 were investigated. The half-lives of GAM-1 and GAM-2 at 70℃ were 45 and 216 min, respectively. Data obtained from fluorescence spectroscopy, circular dichroism spectroscopy, UV absorption spectroscopy, and dynamic light scattering demonstrated that during the thermal inactivation progress, combined with the loss of the helical structure and a majority of the tertiary structure, tryptophan residues were partially exposed and further led to glucoamylases aggregating. The thermal stability of GAM-1 and GAM-2 was largely improved in the presence of sorbitol and trehalose. Results from spectroscopy and Native-PAGE confirmed that sorbitol and trehalose maintained the native state of glucoamylases and prevented their thermal aggregation. The loss of hydrophobic bonding and helical structure was responsible for the decrease of glucoamylase activity. Additionally, sorbitol and trehalose significantly increased the substrate affinity and catalytic efficiency of the two glucoamylases. Our results display an insight into the thermal inactivation of glucoamylases and provide an important base for industrial applications of the thermally stable glucoamylases.

• 한국컴퓨터정보학회논문지
• /
• 제23권10호
• /
• pp.165-172
• /
• 2018

This study was conducted to investigate the relationship between life satisfaction of the elderly and their transfer income (public transfer and private transfer income) using the 11th data of the Korea welfare panel study. In the analysis results, the public transfer income was analyzed to have a significantly positive (+) effect on the life satisfaction in the case of the elderly in general households while in the case of the elderly in low income households, private transfer income was analyzed to have a significantly positive (+) effect on life satisfaction. These results suggest that the public transfer income is 1,019,200 won (monthly average 849,000 won) in the case of the elderly in general households, and the public transfer income is found to have an effect to stabilize the income, which can be expected to increase the life satisfaction. However, in the case of the elderly in low income households, it was found to be 5,080,500 won (monthly average 424,000 won), half of the public transfer income of the elderly in general households. In the case of the elderly of low income households, it can be assumed that the private transfer income, which is the "uncomfortable" income source, fills up the unstable income stabilization gap and raises the life satisfaction. As a policy suggestion, first, by supplementing the basic pension system, which is an irrational part of public transfer income for the elderly with low income, it is necessary to design policy alternatives to enable economic stabilization of the elderly in low income households. Second, it is also necessary to actively review the introduction of income deduction plans for the transfer income of family members for the low income elderly households.

• 한국토양비료학회지
• /
• 제50권1호
• /
• pp.40-48
• /
• 2017

In this study, we evaluated the nitrogen (N) mineralization potential and Nitrogen use efficiency (NUE) of oil-cake, compost, hairy vetch and barley, which are the most widely used organic amendments in South Korea. The N mineralization potential (No) for organic fertilizers treated soil was highest for the hairy vetch treatment with a value of $18.9mg\;N\;100\;g^{-1}$, followed by oil-cake, barley and compost. The amount of pure N mineralization potentials in hairy vetch, oil-cake, barley and compost treatments were 8.42, 7.62, 3.82 and $3.60mg\;N\;100\;g^{-1}$, respectively. The half-life ($t_{1/2}$) of organic N in soil amended with oil-cake fertilizer mineralized quickly in 17 days. While, $t_{1/2}$ values of organic N for the compost and barley treatments accounted to 44.4 and 44.1 days, respectively. Oil-cake was good in supplying nutrients to plants. Compost and barley inhibited plant growth in the beginning growth stage and this is attributed to N immobilization effect. The results of this study highlight that compost and barley could be used as potential slow release fertilizers in conventional agriculture.

• 한국환경농학회지
• /
• 제42권3호
• /
• pp.193-202
• /
• 2023

Residue monitoring of propiconazole (PCZ) in cabbage, shallot, and spinach was conducted under multi-trial greenhouse conditions. This study aimed to understand the fate of the applied fungicide in these vegetables. Furthermore, the associated health risk of PCZ in leafy vegetables was assessed through dietary risk assessment. Commercially available PCZ (22% suspension concentrate) was administered thrice according to the OECD fungicide application interval guideline. The plant samples were extracted using a slightly modified QuEChERS technique and analyzed using gas chromatography-tandem mass spectrometry. The average PCZ recovery was between 84.5% and 117.6%, with a <5% coefficient of variance. The dissipation of PCZ residue in cabbage, shallot, and spinach after 14 days was 96%, 90%, and 99%, respectively, with half-lives of <5 days. Meanwhile, dietary risk assessments of PCZ residues in the studied vegetables using the risk quotient (RQ) were significant < 100 (RQ < 100). Thus, the population groups considered in this study were not at substantial risk from consuming leafy vegetables sprayed with PCZ following critical, good agricultural practices.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2022년도 추계학술대회
• /
• pp.157-157
• /
• 2022

Plants being sessile are prone to various abiotic challenges, including salinity. Plants generally cope with salt stress by regulating their endogenous NO levels. NO exogenously applied in various forms also successfully impedes the salt stress, but its small size, short half life, and high volatility rate hamper its application in agriculture. NO application via CS as a nanocarrier is an alternate option to ensure the optimal kinetic release of NO for a long period compared to the free NO form. Herein, we synthesized and characterized GSNO-CS NP by ionic gelation of TPP with CS and then reacting with GSH, followed by reaction with NaNO₂ suspension. The synthesized NPs were characterized using non-destructive analytical techniques such as DLS, FTIR, and SEM to ensure their synthesis and surface morphology. NO-release profile confirmed optimal kinetic NO release for 24 h from NO-CS NP as compared to free NO form. The efficiency of NO-CS NP was checked on Arabidopsis plants under salinity stress by gauging the morphological, physiological, and enzymatic antioxidant system and SOS pathway gene expression levels. Overall, the results revealed that NO-CS NP successfully mitigates salinity stress compared to free GSNO. Concluding, the findings provide sufficient experimental evidence for the application of nanotechnology to enhance NO delivery, thus inducing more benefits for the plants under stress conditions by mitigating the deleterious impacts of salt stress on the morphological and physiological status of the plants, and regulating the ions exchange by overexpression of SOS pathway candidate genes.

• 가정과삶의질연구
• /
• 제20권3호
• /
• pp.101-111
• /
• 2002

The purpose of this study was to obtain data on the child care support and job satisfaction of married women employed outside home. The data for this study were collected from a survey of 350 married women employed outside home who were residing in North Cholla Province. Major fimding are summarized in the following. First, many married women were pressured by the burdens child rearing(54.5%) and houshold chores(39.6%). Second, the daycare arrangements for children under age seven were diverse. Just under half of the children were cared for by the employed mother'parents(25.1%), or by the mother's parents-in law(21.1%). The rest were sent to daycare center(40.6%), cared for by a hired helper(7.6%), or sent to an industrial on- site daycare center(1.0%). Third, about half of the married employed mothers(47.5%) wished for an on-site daycare service at their workplace. Fourth, the variables that affected employed mothers job satisfaction were age, job, husband's job type, the income of the mother, the reason of the mother's employment, the degree of husband's houshold labor participation, and the type of social and employer's support for chid care.

• 복식문화연구
• /
• 제5권3호
• /
• pp.96-117
• /
• 1997

The purpose of this study is focused on revealing teenager characteristics and mass culture in the end of the 20th century, and researching the general traits of teenager costume in the latter half of the \`90s and the typical style based on the analysis of the teenager culture. The result of this study are following as; The general traits of teenager costume are classified with sports-orientation, brand-orientation, and foreign street fashion-orientation. Typical styles are classified with sportive look, hiphop look, and funny look. Sportive look became the core of the street fashion developed with the street sports in the city, and presented the practical use with the fashionability mixing sportswear such as hightech snickers, sports character wear and items. Hiphop look, the genderless fashion, expresses teenager\`s free life style and the diversiied sensibility and deconstructs the border of gender, racism. Funny look accepts the burden of the millenium as a humor and presents katharsis by creating unexpected style. The contemporary costume of teenager deconstructs the fixed idea about mix and match, good taste and bad taste, gender, coordination suited with T.P.O and intends ‘open costume’ for 21st century.