• 한국초지조사료학회지
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• 제34권3호
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• pp.179-186
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• 2014

The objective of this study was to determine the best performing switchgrass (Panicumvirgatum L.) cultivar with three different seeding dates as a bioenergy source in Republic of Korea. Split-plot in time with three replications was performed and three switchgrass cultivars, Carthage (CT), Cave-in-Rock (CIR), and Forestburg (FB) were used in this experiment from 2009 to 2012. Plots were seeded on April 23, May 4, and May 13, 2009 and were harvested once in November each year. No fertilizer was applied to the field for the first year; however, in second and third years (June 2010 and May 2011, respectively), N, $P_2O_5$ and K2O fertilizers were applied in 67,45 and 90 kg $ha^{-1}$, respectively. Soil pH (5.9) and climate condition including temperature ($10.4{\sim}17.5^{\circ}C$) and precipitation (89.4~109.8 mm $month^{-1}$) were suitable for switchgrass cultivation. Total dry matter yields were higher in CT and CIR compared to FB and were 16.9, 15.9, and 4.5 ton $ha^{-1}$, for CT, CIR, and FB, respectively (p<0.0001). The samples were analyzed for dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), crude fiber (CF), ether extract (EE), and ash. No significant differences in energy content (p = 0.96) and chemical composition among cultivars (p>0.05) were found. Seeding dates did not affect DM yield (ton $ha^{-1}$), chemical composition and energy content significantly (p>0.05). Significant difference was observed for heights among CT, CIR, and FB (177.59, 169.98, and 94.89 cm, respectively, p = 0.0002). In conclusion, based on soil characteristics and climate condition in Korea compared to other countries, switchgrass can be cultivated successfully. Considering dry matter yield and energy content of these three cultivars of switchgrass CT and CIR adapted better to climate in Middle Eastern of Republic of Korea than Forestburg for bioenergy purpose.

• 한국식품위생안전성학회지
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• 제30권2호
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• pp.210-216
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• 2015

본 연구는 마늘의 물추출물(AGE)의 E. coli O157:H7, S. typhimurium, 그리고 S. aureus에 대한 항균효과를 조사하였다. AGE의 E. coli O157:H7, S. typhimurium, and S. aureus에 대한 최소억제농도(MIC)는 각각 24, 48 그리고 24 mg/mL이었으며, 최소살균농도(MBC)는 모든 균에 대하여 96 mg/mL이었다. AGE 24 mg/mL을 E. coli O157:H7에 투여하고 배양 24시간 후에, 균의 증식이 무처리 대조군과 비교하여 유의성 있게 감소하였다(p < 0.01). 그러나 AGE 24 mg/mL을 S. aureus에 투여하고 배양 24시간 후에, 대조군과 비교하여 유의성 있는 균의 증식억제 효과가 나타나지 않았으나, AGE 96 mg/mL을 투여한 경우에서는 배양 24시간 후에 대조군과 비교하여 유의성 있는 균의 증식억제가 나타났다(p < 0.01). AGE 48 (p < 0.05)과 96 mg/mL (p < 0.001)을 S. typhimurim에 투여하고 24시간 배양 후에, 대조군과 비교하여 통계적으로 유의성 있는 균의 증식억제 효과가 나타났다. 본 연구의 결과로부터, 마늘의 물추출물은 항생제와 화학적 식품보존제의 대체제로서 사용이 가능할 것으로 사료된다.

• 한국식품위생안전성학회지
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• 제32권5호
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• pp.418-423
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• 2017

본 연구는 우유 중에서 덱사메타손을 효과적으로 정량분석하기 위한 LC-MS/MS법을 확립하고 이를 검증하기 위해 수행되었다. 확립된 LC-MS/MS에 대해 특이성, 검출한계, 정량한계, 정확도 및 정밀도에 대한 검증을 통하여 유효성을 확인하였다. 표준용액을 이용하여 검량성을 작성한 결과, $r^2$ > 0.999 이상의 직선성을 확인하였고, 덱사메타손에 대한 검출한계와 정량한계는 각각 0.15와 0.5 ng/mL이었다. 또한, 회수율은 98.9-109.6%로 나타났으며, 상대표준편차는 1.7-4.4%로 나타나 정확성이 우수하였으며, 이는 식품의약품안전처의 잔류동물용의약품 분석법에서 제시한 기준에 모두 적합한 수준이었다. 따라서 본 연구를 통해 개발된 LC-MS/MS법은 향후 우유 중 덱사메타손을 분석하는데 효과적으로 활용될 수 있을 것으로 사료된다.

• 한국패류학회지
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• 제20권1호
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• pp.75-84
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• 2004

Reproductive cycle, the condition index, sex ratio of the Pacific oysters, Crassostrea gigas were investigated by histological and morphometric data. The specimens were collected in the two oyster farms of Geoje and Namhae, Gyeongsangnam-do, Korea, from November 1995 to October 1996. Growth of shell length in two regions was similar, but growth of total weight of the oyster in Namhae was faster than that in Geoje oyster farm. The spawning periods in female and male clams were from July to October in Geoje and from June to October in Namhae oyster farm. Ripe oocytes were approximately 50 m in diameter. The reproductive cycle of in females and males in Geoje and Namhae oyster farms can be divided into five successive stages: early developing, late developing, ripe, partially spawned and spent/inactive. Monthly changes in gonad developmental phases showed somewhat different patterns between female and male clams except for the spawning period. On the whole, however, monthly changes in the gonad developmental phases showed a similar pattern in the same sex. The sex ratios of females to males in Geoje and Namhae oyster farms were not significantly different from a 1:1 sex ratio ($x^2$ = 0.55 (p > 0.05) in Geoje and $x^2$ = 0.27 ( p > 0.05) in Namhae). Artificial induction of maturation by heating of adult oysters (two-year-old) was investigated from 17 January to 18 March in 1996. Maturity at the fixed water temperature group of $20^{\circ}C$ was 80%, it showed the highest maturity of experimental groups cultured for five weeks. The survival (%) of Crassostrea gigas in the raised water temperature experimental groups (15, 20, $25^{\circ}C$) were over 98.5%, as similar to the control group (100%). But, the survival of C. gigas in the fixed water temperature experimental groups (15, 20, 25, $30^{\circ}C$) were decreased with the increase of the water temperatures. In the fixed water temperature experimental group of $30^{\circ}C$, the survival was 51.1%. Base on these results, the fixed water temperature of $20^{\circ}C$ was the best condition for artificial induction of sexual maturation.

• 대한화장품학회지
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• 제36권4호
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• pp.281-288
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• 2010

본 연구는 에탄올 농도별(0, 30, 50, 70, 100 %)로 추출한 사매추출물의 항산화 효과를 Oxygen Radical Absorbance Capacity(ORAC)로 평가한 결과 30 % 에탄올 추출물에서 가장 우수하였다. 따라서 30 % 에탄올 추출물의 주름 완화에 관련한 효능 및 효과를 확인하기 위하여 마우스 유래 섬유아세포에 대한 세포 독성, MMP-8 collagenase 억제 활성 검사를 실시하였다. 그 결과 30 % 에탄올 사매추출물을 섬유아세포에 처리한 결과 세포 독성이 없었고, 20 %의 MMP-8 collagenase 억제 활성을 보였다. 사매 추출물 1 %가 함유된 Di-Wrinkle Free Cream (DWFC)으로부터 35 ~ 50세의 21명 여성을 대상으로 하루에 2번 도포하여 8주간 인체 안전성과 주름개선 임상평가를 수행하였다. 주름 평가 방법은 3차원 입체 측정기(PRIMOS)를 이용하여 평가를 하였다. DWFC에 대한 안전성 평가는 피험자 방문 시 마다 이상반응, 부종, 인설, 가려움, 자통, 작열감, 뻣뻣함, 따끔거림이나 다른 이상반응이 발생하는지 육안평가와 문진으로 평가하였다. PRIMOS(GFM, Germany)를 이용하여 눈 주변의 주름을 분석한 결과 시험제품 사용 8주 후 통계적으로 유의하게 주름이 13 % 감소하였으며, 시험기간 동안 특별한 피부 이상반응은 관찰되지 않았다. 이와 같은 결과로 보아 사매추출물은 인체에 부작용이 없는 주름개선에 효과 있는 화장품으로 개발이 가능할 것으로 사료된다.

• 한국임상수의학회지
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• 제29권2호
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• pp.154-159
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• 2012

디클라쥬릴의 음수형 제제인 콕시멸-에스의 항콕시듐 효과를 Eimeria spp. 감염 육계를 이용하여 수행하였다. 본 실험은 실험실 및 야외적용시험으로 나누어 진행하였으며, 실험실 실험에서는 Eimeria spp.를 인공 감염시킨 육계를 대상으로 콕시멸-에스 0.5 ml/L을 음수로 투여한 군에서 대조군과 비교하여 콕시듐 치료, 콕시듐 충란수의 감소, 그리고 장상해도 및 분변 설사지수 등에 있어서 유의성 있는 효과를 나타내었다($p$ < 0.001). 또한, 야외적용실험에서는, 콕시듐증에 걸린 육계를 대상으로 콕시멸-에스를 0.25와 0.5 ml/L로 각각 음수로 투여한 결과, 대조군과 비교하여 모두 유의한 콕시듐 치료효과를 나타내었다($p$ < 0.001). 이상의 결과로부터, 콕시멸-에스 0.25와 0.5 ml/L를 음수로 콕시듐증에 걸린 육계에 투여할 경우, 콕시듐증 치료에 매우 효과적일 것으로 판단된다.

• 태양에너지
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• 제5권2호
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• pp.11-19
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• 1985

In this paper, the interface stability not to occur mixing and entrainment between the adjacent layers has been studied in the case of the selective withdrawal of a stratum and the injection in stratified fluid formed by the density difference in a small solar pond. There are stability parameter, Richardson number, Rayleigh number and Froude number as the parameters governing stability in order to measure the interface stability on the stratified fluid. The model which could measure the interface stability on the stratified fluid was the small solar pond composed by 1 meters wide, 2 meters high, and 5 meters long. In order to measure the interface stability on the stratified fluid at the inlet port, the middle section and the outlet port, Richardson number, Rayleigh number, and Froude number involved in the parameters governing the stability were calculated by means of the data resulted from the test of the study on hydrodynamic stability between the convective and nonconvective layers in that solar pond. Richardson number written by the ratio of inertia force to buoyancy force can be used in order to measure the stability on the stratified fluid related to the buoyancy force generated from the injection of fluid. Rayleigh number written by the product of Grashof number by Prandtl number can be used in order to measure the stability of the fluid related to the heat flux and diffusivity of viscosity. Froude number written by the ratio of gravity force to inertia force can be used in order to measure the stability of the nonhomogeneous fluid related to the density difference. As the result of calculating the parameters governing stability, the interface stability on the stratified fluid couldn't be identified below the 70cm height from the bottom of the solar pond, but it could be identified above the 70cm height from it at the inlet port, the middle section and the outlet port. When compared with such the three parameters as Richardson number, Rayleigh number, Froude number, the calculated result was in accord with them at inlet port, the middle section and the outlet port. Henceforth, it is learned that even though any of the three parameters is used for the purpose of measuring the interface stability on the stratified fluid, the result will be the same with them. It is concluded that all the use of Richardson number, Rayleigh number, and Froude number, is desirable and infallible to measure the interface stability on the stratified fluid in the case of considering the exist of the fluid flow and the heat flux like the model of the solar pond.

• 한국수산과학회지
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• 제24권3호
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• pp.167-176
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• 1991

1988년 4월부터 10월까지, 1989년 6월부터 8월까지 전북 옥구군 회현면 월연리 앞바다에서 채집된 짱뚱어, Boleophthalmus pectinirostris를 대상으로 그들의 생식생태를 파악하기 위하여 생식소 외부 형태, 생식소숙도지수(GSI)와 생식소의 조직학적 방법에 의한 생식주기, 산난기 난소내 난경조성을 조사한 결과는 다음과 같다. 1. 난소는 경골어류의 전형적인 낭상형이고, 정소는 가느다란 관상형이다. 2. 생식소숙도지수(GSI)는 수컷과 암컷이 각각 6, 7월에 연중 최대값을 나타내며, 수컷이 한달 빨리 최대값에 도달한다. 이들 생식소는 수온상승과 함께 활성화 되어 최고 수온기전에 산난기를 마친다. 3. 산난기를 마친 개체의 난소내에는 잔존하는 난모세포중 여포형성을 하지 못한 초기난모세포들은 퇴화하지 않고 휴지기 상태로 월동하여 이듬해 성장에 참여하고 있다. 4. 생식주기는 수온이 상승되는 4월부터 활성화되어 5월 성장기, 6월에서 7월초순 성숙기 그리고 6월말에서 8월초까지 완숙 및 산난기, 9월에서 이듬해 3월까지 퇴화 및 휴지기 상태를 나타낸다. 5. 짱둥어의 산란기동안 난소내 난경조성 및 생식소숙도지수를 조사한 결과 적어도 2회이상 산란하는 종으로 밝혀졌다.

• 동의생리학회지
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• 제14권2호통권20호
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• pp.67-82
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• 1999

The effects of Bogi, Boyang and Onri herbs on glutamte receptor, and the regulatory mechanism of cAMP-protein kinase on the ion currents activated by Bogi, Boyang and Onri herbs using nystatin-perforated patch clamp were investigated and the following results were obtained. Ginseng radix and Astragali radix, Cervi cornu and Boshniakiae herba, and Aconiti tuber and Zingiberis rhizoma were chosen as Bogi, Boyang and Onri herbs respectively. 1. The ion currents activated by $10^{-5}M$ of glycine were used as controls. The magnitudes of the ion currents by the above named herbs were as follows; Cervi cornu>Astragali radix>Aconiti tuber>Zingiberis rhizoma>Ginseng radix>Boshniakiae herba. 2. The magnitudes of the ion currents by $10^{-5}M$ of glutamate pre-treated with 0.01 mg/ml of Bogi, Boyang and Onri herbs were sharply decreased. 3. The activity of ion channels activated by Bogi herbs pre-treated with $10^{-7}M$ of staurosporin, an inhibitor of protein kinase, for thirty seconds was observed as the experiment proceeded. Staurosporin brought about dephosphorylation of ion channels. Hence, while the activity of ion channels activated by Ginseng radix was decreased, the activity of ion channels activated by Astragali radix was increased, as time went by. 4. The activity of ion channels activated by Boyang herbs pre-treated with $10^{-7}M$ of staurosporin, an inhibitor of protein kinase and an dephosphorylating agent of ion channels, for thirty seconds was investigated. While the activity of ion channels activated by Cervi cornu was increased, the activity of ion channels activated by Boshniakiae herba was initially increased then sharply decreased. 5, The activity of ion channels activated by Onri herbs pre-treated with $10^{-7}M$ of staurosporin, an inhibitor of protein kinase and an dephosphorylating agent of ion channels, for thirty seconds was investigated. While the activity of ion channels activated by Aconiti tuber was increased, that of ion channels activated by Zingiberis rhizomal sharply declined.

• 한국식품영양과학회지
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• 제35권7호
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• pp.874-880
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• 2006

건생강 제품의 진위판별을 위한 기초자료를 제공하기 위하여 건조된 생강으로부터 휘발성 향기성분을 추출하여 향기특성을 분석하고, MDGC/MS에 의해 키랄성 휘발성분의 enantiomeric composition을 분석하였다. 건생강에서 총 57종을 동정하였으며 주요 휘발성 향기성분은 zingiberene, ${\beta}-sesquiphellandrene$, ${\beta}-bisabolene$, (E,E)-${\alpha}-farnesene$ 및 ${\alpha}-curcumene$이었다. 건생강에 함유된 키랄성 향기성분 중에서 enaniomeric composition을 측정하기 위해 선택된 키랄화합물 중 ${\alpha}-pinene$ 및 nerolidol은 높은 enantiomeric purity(>96%)로 검출되었으며, ${\beta}-pinene$은 (R)-enantiomer만이 검출되어 특이적이었다. ${\alpha}-Terpineol$은 (R)-enantiomer가 72%로 높게 나타났으며 linalool과 4-terpineol은 두 이성질체가 혼합된 것으로 나타났다. Limonene의 enantiomeric excess(ee, %)는 17.2%로 (S)-enantiomer가 주요 이성질체이었다. 따라서 이러한 키랄성 향기성분의 enantiomeric composition은 건생강의 진위평가를 위한 변수로 사용될 수 있을 것으로 생각된다.