• Title/Summary/Keyword: Agricultural material

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참빗살나무 어린 순의 영양 성분 분석 (Analysis of Nutritional Components of Euonymus sieboldiana Leaves)

  • 강민승;김소영;이연희;최제월;백오현;한혜경;김세나;김정봉;박홍주;조영숙
    • 동아시아식생활학회지
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    • 제21권6호
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    • pp.918-923
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    • 2011
  • This study was aimed to investigate the nutritional components such as proximate content, minerals, vitamins, and dietary fiber of Euonymus sieboldiana leaves. The leaf sample used was fresh material produced in April in the Republic of Korea. As a result, the fresh leaf sample contained 10.30% crude carbohydrates, 7.42% crude proteins, 0.69% crude fat, and 1.46% crude ash, including a high amount of potassium (0.73%). The total dietary fiber, insoluble dietary fiber, and soluble dietary fiber content was 8.77%, 7.60%, and 1.17%, respectively. Vitamin C was found to be 44.53 mg% using colorimetric analysis. We regarded E. sieboldiana as a potential health food material because of its abundant nutritional components like potassium, dietary fiber, and vitamin C.

발간사

  • 신헌철
    • 농업생산자재총람
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    • 통권14호
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    • pp.4-4
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    • 2005
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갇힌 공기를 고려한 불포화토 침투 해석에 관한 연구 (Analysis of Rainfall Induced Infiltration Considering Occluded Air in Unsaturated Soils)

  • 이준용;유찬;김욱기;김동욱
    • 한국농공학회논문집
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    • 제54권5호
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    • pp.129-139
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    • 2012
  • Accurate modeling rainfall induced landslide and slope stability requires a detailed knowledge of the distribution of material strength characteristics and suction distribution. However, material properties obtained from the drying cycle are still used for infiltration analysis in many cases, even though material properties of wetting cycle are quite different from those of drying cycle due to hydraulic hysteresis and air occlusion. Therefore, the selection of proper material properties such as soil-water retention curve (SWRC) and the hydraulic conductivity function (HCF) reflecting characteristics of wetting cycle and air occlusion is an essential prerequisite in order to simulate the infiltration phenomena and to predict the suction and water content distribution in unsaturated soils. It is concluded that the simulation of infiltration with material properties from the drying cycle did not reasonably match with experimental outputs. Further discussion is made on how to describe the material properties considering air occlusion during wetting cycle over the entire suction range in order to simulate infiltration phenomena.

도시농업 교육 프로그램 평가에 관한 연구 -경기도농업기술원 도시농업지도자 과정을 중심으로- (A Study on Assessment of Urban Agriculture Education Program: Focused on Urban Agriculture Instructor Course at Gyeonggi Provincial Agricultural Research & Extension Services)

  • 장보경;최윤지;조정주
    • 농촌지도와개발
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    • 제19권2호
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    • pp.273-299
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    • 2012
  • This study examined importance and performance of urban agriculture education program of the trainees who attended urban agriculture education, and suggested reformation of urban agriculture instructor course of Gyeonggi Provincial Agricultural Research & Extension Services by IPA models. The investigation was done on October 7, 2011. The subject was 40 trainees of urban agriculture instructor course of Gyeonggi Provincial Agricultural Research & Extension Services. The study suggested reformation of urban agriculture education program based on the findings as follow: Firstly, the instructors should teach trainees not theoretically but practically to let the trainees make use of learning at urban agriculture. Secondly, teaching material that is not theoretically but practical enough to apply it to actual urban agriculture should be supplied. Thirdly, urban agriculture education should be done not theoretically but practically considering its characteristics. Theoretical contents have been already included in teaching material, and practice oriented education should be done to let trainees put theory into practice on-the-spot. Practice oriented education should be supported in the planning future education. In addition future urban agriculture education program should consider importance as well as practice of educational contents, lecturers, operations and facilities.

각종 송출 호오스의 구경 및 길이가 농용양수로의 소요동력에 미치는 영향 (Influence of Flowing Velocity and Length of Delivery Hoses on Power Requirement of Agricultural pump.)

  • 김기대;김성래;이한만
    • Journal of Biosystems Engineering
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    • 제4권2호
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    • pp.46-52
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    • 1979
  • The water delivery hose for agricultural pump is getting popular in rural areas in korea. Friction head loss, discharge, and power requirements were measured in various discharge for different material and diameter of hose to get basic data for economical use in agricultural pump. The results attained in this study were as follows ; 1. Friction head loss increased significantly as the velocity increased, and the difference of velocity between the different diameter of hose was bigger than that between materials, which was resulted in the increase of the friction head loss. 2. Friction head loss in the case of that the velocity with 2m/sec was constant was about 3.53 to 4.01 m/100m in the diameter 3" and about 2.30 to 3.10 m/100m in the diameter 4". Material A of diameter 3" showed the maximum value 8.4m/100m in Reynolds number $2.0\times10^5$, 4" got the minimum value 2.24m/100m, the difference between these values was bigger than 6m per 100 meters in the friction head loss. 3. Darcy-Weisbach formular with friction coefficient [f] calculated by Nikurades formular in the smooth pipe or with friction coefficient [f] calculated on the base of C value 125 in Hazen-Williams formular was available in friction head loss of the water discharger hose in rural areas. 4. Total head increased as friction head loss increased , meanwhile total discharge decreased, and 20 percents of energy was more saved in Material C 4″pipe than Material A 3″pipe in the view point from the discharge per unit power requirement, this phenomenon suggested that long distance pipe would be advantage in larger diameter pipe for save of energy. for save of energy.

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Biochemical Characteristics of an Alanine Racemase from Xanthomonas oryzae pv. oryzae

  • Kang, Han-Chul;Yoon, Sang-Hong;Lee, Chang-Muk;Koo, Bon-Sung
    • Journal of Applied Biological Chemistry
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    • 제54권4호
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    • pp.231-237
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    • 2011
  • A gene encoding a putative alanine racemase in Xanthomonas. oryzae pv. oryzae was cloned, expressed and characterized. Expression of the cloned gene was performed in Escherichia coli BL21(DE3)pLys using a pET-21(a) vector harbouring $6{\times}histidine$ tag. Purification of the recombinant alanine racemase by affinity chromatography resulted in major one band by sodium dodecyl sulfate polyacryl amide gel electrophoresis analysis, showing about 45 kDa of molecular weight. The alanine racemase gene, cloned in this experiment, appears to be constitutively expressed in X. oryzae, as analyzed by reverse transcriptase polymerase chain reaction. The enzyme was the most active toward L-alanine and secondly D-alanine, showing a racemic reaction, thus the enzyme is considered as an alanine racemase. The enzyme was considerably activated by addition of pyridoxal-5-phosphate (PLP), showing that 75% increase in activity was observed at 0.3 mM, compared with control. D-Cysteine as well as L-cysteine significantly inhibited the enzyme activity. The inhibitions by cysteines were more prominent in the absence of PLP, showing 9 and 5% of control activity at 2 mM of addition, respectively. The enzyme was the most active at pH 8.0 and more stable at alkaline pHs than acidic pH condition.

Effect of Dietary Genetically Modified ${\beta}$-Carotene Biofortified Rice on Immune in Rats

  • Park, Soo-Jin;Jeong, Mi-Hye;Park, Kyung-Hun;Park, Jae-Eup
    • Reproductive and Developmental Biology
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    • 제36권2호
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    • pp.133-139
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    • 2012
  • This study aims to examine the effect of Genetically Modified ${\beta}$-Carotene Biofortified Rice rice developed by simultaneous expression technology in NAAS on biological immunity. Accordingly, this study added Genetically Modified ${\beta}$-Carotene Biofortified Rice 25, 50% and general rice 50% as control group into diet and provided rats with the prescribed feeds and then measured the contents of immunoglobulin and cytokine in blood. As a result, male and female IgM, IgE, male IgG1, female IgG2a and TNF-a, IL5 and IL12 showed no significant difference; male IgG2a tended to decrease dependently on the combined concentration of Genetically Modified ${\beta}$-Carotene Biofortified Rice; female IgG1 showed significance with control group, but its association with diet was not found. The higher the dietary mixing ratio, the more the male and female IFN-a and female IL-4 contents, regardless of rice variety, and it was found that female IL6 content decreased significantly, but its association with diet was not found. The risk of beta carotene-enriched rice into environment and human body has not been reported yet. The digestion of Genetically Modified ${\beta}$-Carotene Biofortified Rice can be seen as "safe" as this test result showed no big difference between general rice and Genetically Modified ${\beta}$-Carotene Biofortified Rice, and its usability is full of suggestions.

토마토 농약다성분분석 정도관리용 분석표준물질 개발 (Development of Analytical Reference Material for Proficiency Test of Pesticide Multi-residue Analysis in Tomato)

  • 김종환;오영곤;최성길;홍수명;김선배;우인덕;김준영;서종수
    • 한국환경농학회지
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    • 제35권3호
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    • pp.223-233
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    • 2016
  • BACKGROUND: This study was to develop a analytical reference material including twenty pesticides in tomato. To use it for proficiency test, the suitability of homogeneity, storage stability, assigned values and uncertainty for analytical reference material were important.METHODS AND RESULTS: In order to develop a analytical reference material of tomato for multi-residue analysis of pesticides, twenty-pesticides were treated in tomato and the samples were frozen and homogenized. The homogeneity, stability, assigned value and uncertainty were calculated according to the requirements of the KS A ISO Guide 35, KS Q ISO 13528 and EURL-PT protocol. The values of the within-bottle standard variation(swb) and the between-bottle standard variation(sbb) were 0.9~6.5% of assigned value and the uncertainty(u*bb) due to inhomogeneity was also calculated as 0.6~1.9% for all pesticides. This indicated that it was satisfactory to be used as a analytical reference material. The storage stabilities of twenty-pesticides at room temperature and freezing conditions were assessed according to the requirement of the KS Q ISO Guide 35. All pesticides were stable at room temperature (20~30℃) for 8 days and freezing (-20℃) for 23 days.CONCLUSION: The feasibility of analytical reference material for pesticide multi-residue analysis in a tomato matrix was investigated. Homogeneity of within/between-bottle, uncertainty and stabilities at room temperature and freezing condition were satisfactory for a use of proficiency test and quality control. From these results, a analytical reference material would be applicable to monitor the proficiency test of pesticide analysis organizations to improve the reliability and consistency.

배추좀나방 방제약제로서 후추 추출물, 카시아 오일, 라벤더 오일 함유 친환경유기농자재에 대한 급성 생태독성평가 (Acute Ecotoxicity Evaluation of Environmental-friendly Organic Agro-materials Containing Pepper Extract, Cassia Oil, Lavender Oil for Control of Diamondbackmoth)

  • 유아선;정미혜;홍순성;장희섭;이제봉;박경훈;이영묵;임양빈
    • 농약과학회지
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    • 제17권4호
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    • pp.343-349
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    • 2013
  • 식물추출물 후추 추출물과 카시아 오일, 라벤더 오일을 이용하여 친환경유기농자재로 개발 중인 제품으로 배추좀나방 방제에 이용할 수 있는 후추 추출물+카시아 오일 57.5% (후보제형 A), 후추 추출물+카시아 오일 57% (후보제형 B), 후추 추출물+라벤더 오일 50% (후보제형 C) 유제의 생태에 대한 급성독성을 평가하여 친환경농자재 시제품으로서의 활용가능성을 확인하고자 하였다. 물벼룩 급성독성을 실시한 결과 후보제형 A 및 C 유제의 $EC_{50}$은 각 0.46, 0.25 mg $L^{-1}$로 EPA 기준으로 강한 독성이었고, 후보제형 B 유제의 $EC_{50}$는 1.9 mg $L^{-1}$로 보통독성이었다. 잉어 급성독성 시험의 경우, 후보제형 A 유제의 $LC_{50}$가 1.9 mg $L^{-1}$으로 농촌진흥청 고시에 따라 어독성 II급 농약이었으며 후보제형 B, C 유제는 2.9, 3.8 mg $L^{-1}$로 어독성 III급 농약으로 구분되었다. 꿀벌 급성독성시험은 접촉과 섭식 시험으로 나누어서 실시하였고, 후보 3종 모두 접촉과 섭식독성 $LD_{50}$가 100 ${\mu}g$ a.i $bee^{-1}$ 이상으로 나타나 독성이 낮은 것으로 판단되었다. 지렁이 급성독성시험의 경우, 후보제형 A, B 및 C 유제의 $LC_{50}$가 각각 887, 988, 564 mg $kg^{-1}$이었다. 후추 추출물+카시아 오일 57% (후보제형 B), 후추 추출물+라벤더 오일 50% (후보제형 C) 유제는 어독성 및 꿀벌 급성독성이 낮아 친환경 농자재로서 활용이 가능할 것으로 사료되었다.

농약 품목에 대한 GHS 기준과 농진청 기준에 따른 자극성 산출 후 자극성 분류 차이 비교 (Comparison of Differences between the Results of Irritation Classification after Irritation Calculation with GHS Criteria and RDA Directives in Plant Protection Products)

  • 유아선;오진아;박수진;조유미;이제봉;이난희;이주연;임양빈
    • 농약과학회지
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    • 제20권4호
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    • pp.326-340
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    • 2016
  • 농약의 원제에 대한 GHS 체계 도입에 따라 농약 품목에 대한 GHS 도입 필요성이 대두되고 있어 GHS 도입 시 현행과의 평가 기준을 비교하였다. 농약 59 품목의 독성시험성적에 대하여 농약관리법과 GHS에 따라 피부자극성 및 안점막자극성을 산출 및 분류한 결과, 피부자극성 경도 및 중도로 분류된 품목에서 GHS 기준에 의해 '분류되지 않음'으로 구분된 품목이 전체의 25.5%였고 안점막자극성 경도에서 GHS 기준에 의해 '분류되지 않음'으로 구분된 품목이 45.8%로 나타나 자극성 구분이 완화되었다. 반면 비가역적 반응의 평가에 의해 경도와 중도에서 피부자극성이 피부부식성 구분 1로 보다 높게 평가된 품목이 6.8%, 안점막자극성이 심한 눈손상 구분 1로 보다 높게 평가 된 품목이 5.1%였다. 농약 품목의 시험성적을 이용한 GHS 분류와 품목에 함유된 원제의 자극성 구분과 함유량을 이용하여 GHS 혼합물 분류기준에 따라 분류한 결과를 비교한 결과, 피부자극성에서는 25.5% 품목의 자극성 구분이 완화되었고, 3.4% 품목의 자극성 구분이 강화되었다. 안점막자극성에서는 25.4%의 품목에 대한 자극성 구분이 완화되었고 11.9%의 품목의 자극성 구분이 강화되었다. 농약 품목에 GHS를 도입할 경우, 상이한 분류 결과를 보완할 수 있는 방안 마련이 필요하다고 사료된다.