• 현장농수산연구지
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• 제7권1호
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• pp.64-73
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• 2005

1. 토양 pH는 수원이 6.62, 춘천이 5.65, 강릉이 5.9, 연천이 5.9, 태안이 5.82로 수원을 제외하고 둥근마의 적정 pH 6.2보다 산도가 높은 산성토양으로 둥근마 재배에 불리한 조건이었다. 유기물 함량은 수원 1.96%, 춘천 4.51%, 강릉 3.76%, 연천 1.89%, 태안 1.12%로 춘천, 강릉이 다른지역보다 높아서 유리한 조건이었다. 2. 일조시간은 수원이 4-10월 총 일조시수가 1,409시간으로 춘천의 1,329시간, 포천의 1,361시간보다는 높게 나타났으나 강릉의 1,440시간, 태안의 1,475보다 낮게 나타났다. 수원의 평균기온은 4~10월 평균 18.38℃로, 강수량은 4-10월 평균 140mm으로, 춘천 160.83mm, 강릉 195mm, 연천 139mm 및 태안 155mm로 큰 편차는 보이지 않았으나 강릉지역은 6, 7, 8월에 집중호우 현상을 보였다. 3. 지역별 둥근마 재배시 괴경의 건조중을 나타낸 결과이다. 수확시의 건조중은 수원이 135g으로 가장 좋았으며, 연천이 128g, 춘천 120g, 강릉 95g, 태안이 90g으로 나타났다. 4. 강릉지역의 둥근마를 단마와 성분 특성을 비교한 결과둥근마의 건물 함량은 36.5%로 단마 28.9%보다 건물량이 높은 편이다. 조사포닌 함양에서 둥근마의 함량이 23.7mg/g로 단마 10.4mg/g보다 월등히 높은 편이다.

• 식물병연구
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• 제18권1호
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• pp.1-9
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• 2012

친환경유기농자재로 등록되어 있는 농자재 중에서 무기염류, 오일류, 식물추출물, 그리고 키토산 등 총 20종을 선발하여 고추 역병과 탄저병에 대한 방제 효과를 조사하였다. 무기물류 중에서 수산화동은 배지상에서 역병균과 탄저병균의 생육을 모두 억제하였고, 아인산은 역병균의 생육만을, 그리고 황/생석회는 탄저병균의 생육만을 억제하였다. 식물정유, 로즈마리오일, 채종유, 그리고 매실/은행 추출물 역시 두 종류 식물병원균의 생장을 억제하였다. 고추 유묘를 이용한 역병 방제효과 검정에서는 4엽기의 유묘보다는 6엽기의 유묘에서 유기농자재의 효과가 효과가 우수하였다. 특히 수산화동, 황/생석회, 수용성칼슘, 아인산, 식물정유, 정향추출물 등이 80% 이상의 예방 효과를 보였다. 하지만 실험에 사용한 모든 유기농자재는 역병에 대해서 치료효과를 보이지 않았다. 열매를 이용한 탄저병에 대한 효과 검정에서도 대부분의 유기농자재는 치료 효과보다는 예방 효과가 우수하였다. 병원균을 무상처 접종하였을 때, 50% 이상의 효과를 보였던 수산화동, 황/생석회, 황산동/생석회, 과망간산칼륨, 식물정유, 채종유, 소리쟁이 추출물, 스테비아 추출물, 키토산 등은 병원균을 상처 접종할 경우 그 효과가 감소하여, 황/생석회, 채종유, 소리쟁이 추출물, 스테비아추출물 등에서만 79.9, 78.1, 66.6, 58.6%의 예방효과가 나타났다. 실험에 사용한 20종의 자재 중에서 수산화동에서만 병원균을 무상처 접종하였을 때, 75.6%의 치료효과를 보였다.

• Archives of Pharmacal Research
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• 제25권6호
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• pp.865-872
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• 2002

In the course of the investigations of natural antioxidants, we examined the antioxidant activities of the methanol (MeOH) extracts of some selected Prunus species, including P. buergeriana, P. davidiana, P padus, P. pendula for. ascendens, P. sargentii, P. serrulata var. spontanea and P. yedoensis by three methods as represented by the 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical, total ROS (reactive oxygen species) and the peroxynitrite ($ONOO^-$) scavenging activity tests. We also evaluated the activities of the organic solvent-soluble fractions, including the dichloromethane ($CH_2Cl_2$), ethyl acetate (EtOAc), n-butanol (n-BuOH) fractions and the water ($H_2O$) layer of P. serrulata var. spontanea leaves. By means of bioassay-directed fractionation, we isolated eleven known flavonoids (1-11) from the EtOAc soluble fraction of the MeOH extract of the Prunus serrulata var. spontanea leaves, exhibiting strong antioxidant activity and characterized as prunetin (1), genistein (2), quercetin (3), prunetin $4'-O-{\beta}-glucopyranoside$ (4), kaempferol $3-O-{\alpha}-arabinofuranoside$ (5), prunetin $5-O-{\beta}-glucopyranoside$ (6), kaempferol $3-O-{\beta}-xylopyranoside$ (7), genistin (8), kaempferol $3-O-{\beta}-glucopyranoside$ (9), quercetin $3-O-{\beta}-glucopyranoside$ (10) and kaempferol $3-O-{\beta}-xylopyranosyl-(1{\rightarrow}2)-{\beta}-glucopyranoside$ (11). Compounds 3 and 10 showed good activities in all tested model systems. Compounds 2 and 8 showed scavenging activities in the DPPH and $ONOO^-$ tests, while compounds 5, 7, 9 and 11 were active in the $ONOO^-$ and ROS tests. On the other hand, compounds 1, 4 and 6 did not show any activities in the tested model systems.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.84.1-84.1
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• 2015

Recent years in particular in Korea see intensive interests in a deep geothermal engineering and its application in different uses as far as from direct uses to power generation sectors, that are achieved by harnessing hot energy sources from the earth. For instance widespread interest has been generated because the geothermal energy is the source that one extracts it for more than 20 hours per day and for about 30 years of an operation of the plant, which enables to give base load as for heating as well as an electric generation. In retrospect, shallow geothermal energy using heat pumps is commonplace in Korea while the deep geothermal is in the early stage of the development. Geothermal energies in view of the way of extracting heat are mainly categorized into several types such as a single well system, a hydrothermal system, an enhanced geothermal system (EGS) etc. In this talk, this speaker focuses on the thermo-fluid engineering of the single well system by introducing the modeling in order to harness hot fluid that is thermally balanced with the fluid of an injection well, which provides a challenge to assess the life time of the well. To avoid the loss of the temperature in producing the hot fluid, a specialized pipe or a borehole heat exchanger has been designed, and its concept is introduced. On the other hand, a binary system or an organic Rankine cycle, which provides the methodology to convert the heat into an electricity, is briefly introduced. Some experimental results of the binary system which has been constructed in our lab will be presented. Lastly as for the future direction, some comments for the industrialization of the deep geothermal energy in this country will be discussed.

• 한국식품저장유통학회지
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• 제2권2호
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• pp.277-284
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• 1995

To study the shelf-life of cut cabbage kimchi, we examined the several quality characteristics of cabbage kimchi under various storage temperatures and packing materials. The pH of kimchi extracts were decreased to 4.0 in the condition of storage at 8$^{\circ}C$ during 6 days, at 4$^{\circ}C$ during 18days, 0$^{\circ}C$ during 42 days. The increase patterns of the organic acid were reverse to the changes of pH under the all conditions. The contents of reducing sugar were continuously decreased at 8$^{\circ}C$ , but increased gradually at 0$^{\circ}C$ and 4$^{\circ}C$ storage conditions. The contents of vitamine C were decreased at the early storage but increased to optimum ripening stage of pH 4.2-4.4 and after decreased continuously. The total bacterial cell counts of cabbage kimchi were increased suddenly at the early storage and after decreased gradually. And at the higher storage temperature, the more lactic acid bacteria were. On the results of sensory evaluation of cabbage kimchi at marketable shelf-life, sour taste and sour smell were significant under all experimental conditions by Duncan's multiple range test. On the above all results, we concluded that the marketable shelf-life of cut cabbage kimchi were 42 days, 19 days, 6 days at 0$^{\circ}C$, 4$^{\circ}C$, 8$^{\circ}C$ storage condition respectively.

• 한국환경보건학회지
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• 제24권3호
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• pp.63-69
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• 1998

The treatment of soils and water contaminated with MTBE using the Fenton oxidation was investigated. The effects of dosage of $H_{2}O_{2}$, and Fe$^{2+}$ concentrations, and solution pH on transformation and mineralization in soil were evaluated. Generation of TBA and acetone following Fenton-oxidation of MTBE in water and generation of acetone following Fenton-oxidation of TBA were observed. Therefore TBA and acetone are degradation intermediates of MTBE. There was a large difference of treatment efficiency in Fenton oxidation of MTBE between soil and water system. This may be caused by the complex nature of soil, soil organic matter which can consumed OH $\cdot$ radicals, and interacting with inorganic-soil constituents. The pH of soil was observed to have a significant effect on the chemical oxidation efficient of MTBE in soil The data demonstrated that optimal pH range were pH 3~4 and around 6. The soil batch studies demonstrated that treatment efficiency of MTBE was enhanced by adding additional ferrous salts but Fenton-oxidation occurred in no additional iron which indicated that iron in soil can catalyze the Fenton-oxidation. The most effective parameter of Fentonoxidation was $H_{2}O_{2}$/Fe$^{2+}$ ratio which theocratical ratio is 0.5. The optimal range of this ratio was found to be 0.6~2.3. In evaluating effect of $H_{2}O_{2}$ dosage on treatment efficiency, the increase of $H_{2}O_{2}$ did not always lead to increase of decompositions of MTBE in soil. Fenton oxidation was effective in destroying MTBE in aqueous extracts of contaminated soil and water. Experimental data provided evidence that the Fenton oxidation can effectively remediate MTBE-contaminated water and soil.

• 한국약용작물학회지
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• 제18권4호
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• pp.244-247
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• 2010

It's crucial to control Alternaria blight and Anthracnose emerging mostly on ginseng leaves during the rainy season to increase the organic ginseng products. The purpose of this study is to investigate the efficay of lime-brodeaux spray on the ginseng leaves and evaluate the growth and yield of the ginseng, and the contents of ginsenoside and 70% ethanol extracts from 3-year-old ginseng variety, Cheonpoong. Lime-bordeaux sprayings were conducted in the ratio of 6-6 in June, 8-8 from July to September every 15 days. After June 10, the spraying have no effects on the growth leaf and stem, and there was no significant increase in chlorophyll contents. The ratio of intact leaf and root were distinctly increased because Alternaria blight and Anthracnose were decreased by spraying lime-bordeaux mixture. Root weight per plant and root yield were increased by 15%, and 62% in 3-year old ginseng, respectively, because the ratio of intact leaf and root were higher by using lime-bordeaux mixture. Furthermore, spraying of lime-bordeaux mixture is prone to increase the ratio of rusty root in ginseng. Spraying of lime-bordeaux mixture decreased both of the contents of ginsenoside and 70% ethanol extract by 13.7%, and 15.2% in 3-year-old ginseng, respectively.

• 미생물학회지
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• 제28권1호
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• pp.76-82
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• 1990

낙동강에서의 수은 내성세균이 본포를 조사한 결과 $HgCl_{2}$가 20ppm이상 함유된 배지에서 정상이 가능한 수은 내성세균이 전체

• 한국수산과학회지
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• 제15권2호
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• pp.117-122
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• 1982

오분자기의 정미성분에 관한 자료를 얻고자 핵산관연물질, 유리아미노산, TMAO, TMA 및 총creatinine을 분석하였다. 핵산관련물중 AMP가 가장 많아서 $2.21{\mu}mole/g$이었으며 IMP와 inosine은 흔적량이었다. 유리아미노산중 함양이 많은 것은 taurine, arginine 및glycine으로 이들 3종 아미노산이 전유리아미노산의 $79.3\%$를 차지하였으며 tyrosine과 phenyl alanine은 흔적량이었다. TMAO, TMA 및 총 creatinine의 사양은 각각 $5.4mg\%,\;1.0mg\%$, 그리고 $5.0mg\%$ 였다. Omission test 결과 오분자기의 정미성분은 유리아미노산이 그 주체를 이루고 여기에 유기산과 핵산관련물질이 보조적인 역할을 하는 것으로 생각된다.

• 분석과학
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• 제16권2호
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• pp.166-173
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• 2003

HRGC/ECD를 이용한 congener specific analysis 방법으로 국내 유통식품 중 PCBs의 오염실태를 조사하였다. Indicator PCB인 IUPAC #28, #52, #101, #118, #138, #153 및 #180 7종을 대상물질로 하였으며, 소고기, 돼지고기, 닭고기, 계란, 고등어, 조기, 멸치, 오징어, 바지락을 대상시료로 선정하여 서울, 부산, 광주 3개 지역에서 수집하였다. 채취한 시료는 균질화하여 알칼리 분해후 유기용매로 추출하여 지방을 분해하고 실리카겔 컬럼으로 정제하여 dual column-HRGC/ECD로 분석하였으며 검출된 시료에 대해서는 HRGC/MSD로 재확인하였다. 분석결과 고등어 등 어류 시료에서 미량수준 (0.0002~0.001 mg/kg)의 PCBs가 검출되었으며 주요 검출물질은 PCB #101과 PCB #118이었다.