• 한국식품조리과학회지
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• 제17권4호
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• pp.344-352
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• 2001

본 연구에서는 streptozotocin으로 당뇨를 유발시킨 흰쥐에게 methanol로 추출하여 분획한 참마의 $H_2O$ 분획물을 경구투여하고 selenium(Se)은 식이로 보충하여 당뇨시 14일간 에너지대사물 수준과 지질과산화에 미치는 영향을 실험하여 다음과 같은 결과를 얻었다. 간장과 근육의 glycogen 함량의 변화는 정상군과 당뇨대조군 사이에 유의적인 차이를 보이지 않았으며 당뇨실험군 사이에도 유의적인 차이를 보이지 않았다. 간장, 신장 및 근육의 단백질 수준도 정상군과 당뇨대조군에서 유의적이 아니었으나 근육단백질 수준이 당뇨대조군보다 DJR-Se 병용 투여군에서 높았다. 간장의 콜레스테롤 수준은 정상군과 당뇨대조군 사이에 유의적이었으며 당뇨대조군에 비해 당뇨실험군 모두에서 콜레스테롤 수준이 낮았으나 유의성은 보이지 않았다. 간장의 중성지방 수준은 당뇨대조군에 비해 DJT-Se군에서 유의적으로 높아 참마와 Se 처리의 상승작용을 보였다. 지질과산화에 영향을 주는 MDA 수준은 간장의 경우 정상군과 당뇨대조군 사이에 유의적이 아니었고 폐의 MDA 수준은 실험군과 당뇨군 모두에서 가장 낮은 수준으로 당뇨대조군에 비해 Se군에서 유의적으로 낮았다. 간장의 MDA 수준은 유의적인 차이는 아니었지만 정상군에 비해 당뇨대조군에서 높은 수준이었고 DJT-Se 병용투여군에서 모든 실험군 중 유의적으로 가장 낮은 수준이었다. 본 연구 결과 STZ 당뇨 쥐에서 참마의 $H_2O$ 분획물과 Se 투여시 지질과산화에 미치는 영향은 간장에서 MDA 수준이 가장 높았다. Se 단독 투여시 제일 큰 영향을 받는 장기는 폐였으며 다음이 신장으로 간장의 MDA 수준을 낮추는데는 DJT-Se 병용투여시 가장 효과적이었다. 참마의 $H_2O$ 분획물투여와 Se 보충은 전보의 연구 결과와 유사하게 참마나 Se를 독립적으로 섭취하는 것보다는 병용하여 보충하는 것이 지방대사물과 지질과산화에 작용하여 항산화효과에 상승작용을 보였으며 참마는 항산화에 영향하는 생리활성성분을 함유하는 식품으로 당뇨식이 처방에 유용하리라 생각된다.

• 분석과학
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• 제25권6호
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• pp.339-344
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• 2012

In this research, hydride generation in HPLC-ICPMS for the selenium speciation was investigated. Chemical and photochemical vapor generation techniques were compared for the effective generation of selenium vapour. $HBr/KBrO_3$ was used for the chemical reduction and a UV lamp was used for the photochemical reduction. It was found out that the photochemical reduction was more effective than the chemical reduction in all of selenium species studied. The optimum conditions for the generation of vapour are 0.4% KI, 2.5% $NaBH_4$, and 1.0 M HCl. The enhancement factor using a photochemical hydride generation was from 6.3 to 16.7 times for inorganic and organic selenium species.

• 한국식품조리과학회지
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• 제18권3호
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• pp.300-308
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• 2002

The purpose of this study was to investigate the effect of chloroform(CHC1$_3$) fraction of Alisma canaliculatum All. Braun et Bouche(Ac) with selenium(Se) on the plasma glucose and lipid levels in streptozotocin(STZ)-induced diabetic rats. Male Sprague-Dawley rats were divided into five groups. The normal and diabetic rats were separated into four groups: the STZ-control group, the Ac group, the Ac-Se group and the Se group. Diabetes was induced in the male rats by an injection of STZ into the tail vein at a dose of 45 mg/kg. The CHCl$_3$fraction of Ac(250 mg/kg) was administered orally for 14 days. The supplementation was achieved with the AIN-93 recommended diet by adding 2 mg/kg diet of selenium as Na$_2$SeO$_3$. which was prepared freshly everyday. The body weight, hematocrit(Hct), glucose, insulin, cholesterol, HDL-cholesterol, triglyceride(TG) and free fatty acids(FFA) concentrations in plasma were measured. The aminotransferase activities were also analyzed. The changes of body weight in the experimental groups were not significantly different from that of the STZ-control group, but diabetes hyperphagia accompanied changes with body weight loss in Ac-Se group. The levels of Plasma cholesterol were not significantly different among the experimental groups. The concentrations of FFA in the Ac-Se group increased significantly compared with the STZ-control group. The effect of Se alone significantly increased aspartate aminotransferase activity and alanine aminotransferase activity. The results showed that the treatment of CHCl$_3$fraction of Ac in combination with Se has no synergistic effect. There was a tendency for the plasma glucose levels to decrease when Se was administered into diabetic rats. Supplementation of Se in diabetic rats did not elicit a significant increase in plasma insulin levels and exhibited hypotriglyceridemic effect.

• 천문학회보
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• 제27권2호
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• pp.40-40
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• 2002

• 한국군사과학기술학회지
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• 제16권3호
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• pp.358-364
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• 2013

Borosilicate glass(GVB-Solutions in glass, 2mm, Germany) was prepared in the composition of $80.4SiO_2-4.2Na_2O-2.4Al_2O_3-13.0B_2O_3$. The 2-step crystallization was performed around $584^{\circ}C$ of glass transition temperature ($T_g$), and $774^{\circ}C$ of crystallization temperature($T_c$). The maximum nucleation rate was $8.8{\time}10^9/mm^3{\cdot}hr$ at $600^{\circ}C$ and the maximum crystal growth rate was 3.5nm/min at $750^{\circ}C$. The maximum mechanical properties were observed at 22.8% of volume fraction, the strength, hardness and fracture toughness was 555MPa, $752kg/mm^2$, $1.082MPa{\cdot}mm^{1/2}$. The crystal size of 177nm which has volume fraction of 22.8% showed maximum strength of 562MPa, it is about 157% higher than parent borosilicate glass. From these results, the crystallized borosilicate glass can be applied weight lighting of bullet proof materials.

• 지질공학
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• 제30권3호
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• pp.379-397
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• 2020

본 연구에서는 1922년부터 2019년까지 동래온천수의 장기적인 온천수 수질 변화 특성을 살펴보았다. Mann-Kendall 분석과 Sen의 기울기에 의해서 동래온천수의 장기적인 수질 특성 변화를 분석하면, 온도, Ca, SiO₂, HCO₃는 증가 추세를 보이는 반면에 EC, Na, K, Mg, Cl, SO₄은 감소 추세를 보이거나 또는 거의 추세 변화를 보이지 않는다. 동래온천수의 수질유형은 시간경과에도 변하지 않고 Na-Cl형에 안정적으로 속하고 있다. 2004년, 2009년, 2014년, 2019년의 수질 자료를 이용한 공간 분포도에 의하면, 시기별로 변동을 보이며, 시료 채취 지점에 따라 값의 변화를 보인다. 이는 장기적인 온천수 개발에도 불구하고 동래온천수의 공간적인 수질 특성은 거의 일정하다는 것을 지시한다.

• Nano
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• 제13권12호
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• pp.1850141.1-1850141.11
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• 2018

Sodium ion batteries based on the more sodium source reserve than that of lithium have been designed as promising alternatives to lithium ion batteries. However, several problems including unsatisfied specific capacity and serious cyclic stability must be solved before the reality. One of the effective approaches to solve the abovementioned problems is to search for suitable anode materials. In this work, we designed and prepared $FeSe_2$ nanoflakes via a simple hydrothermal method which can be adjusted in composition by Fe precursor. As a potential anode for sodium storage, the optimized $FeSe_2$ electrode was further evaluated in different electrolytes of $NaClO_4$ in propylene carbonate/fluoroethylene carbonate and $NaCF_3SO_3$ in diethylene glycol dimethyl ether. The capacity was about $470mAh\;g^{-1}$ and $535mAh\;g^{-1}$ at $0.5A\;g^{-1}$, respectively, in the voltage between 0.5 V and 2.9 V in the cycle of stabilization phase. Superior performance both in capacity and in stability was obtained in ether-based electrolyte, which affords the property without plugging the intermediates of transition metal dichalcogenides during charge/discharge processes.

• 한국환경과학회지
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• 제9권3호
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• pp.229-239
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• 2000

Spring, ground and thermal waters in the vicinity of Mt. Geumjeong and Mt. Baekyang area have been sampled and analyzed for major and minor elements. According to the Piper diagram, spring water belongs to $Ca-HCO_3$ and $Na-HCO_3$ types, groundwater to $Ca-HCO_3$ type, and thermal water to Na-Cl type. Based on the phase stability diagrams of $[Ca^{2+}]/{[H^+]}^2, [Mg^{2+}]/{[H^+]}^2, [K^+]/[H^+]$, and $[Na^+]/[H^+] vs. [H_4SiO_4]$, spring water, groundwater and thermal water are mostly in equilibrium with kaolinite. The result of factor analysis shows three factors (factor 1, 2 and factor 3) for the spring water, the groundwater and the thermal water which are represented by the influence of the dissolution of feldspar, calcite, anthropogenic sources (domestic and industrial wastes) and salt water.

• 천문학회보
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• 제27권1호
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• pp.47-47
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• 2002

• Preventive Nutrition and Food Science
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• 제14권2호
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• pp.142-147
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• 2009

In this study, the selenium (Se) accumulations of soybean sprouts and mungbean sprouts treated with various concentrations of Se-solutions were evaluated, as part of a broader effort to produce Se-enriched variants of the plants. Four levels of sodium selenate ($Na_{2}SeO_{4}$)-dissolved solutions (i.e. 0, T0; 6, T1; 60, T2; and $600{\mu}g/mL$, T3) were prepared and sprayed onto the plants during cultivation. The effect of different spraying periods on Se accumulation was also assessed by watering plant groups once a day for periods of one, two, or three days. Se solution remaining on the surfaces of the plants was washed out by spraying with distilled water on the final day of cultivation. However, the increase of Se accumulation in the plants was found to depend on both Se-concentration and watering period, and the soybean sprouts were determined to accumulate Se more effectively than the mungbean sprouts. Additionally, with regard to Se accumulation in the plants, the period of application of Se solution was determined to be more important than the concentration of the Se solution applied. The averaged total levels of Se-enrichment in whole soybean sprouts at T0, T1, T2, and T3 were 0.26, 65.86, 179.62, and $525.12{\mu}g/dry$ matter (DM) g, respectively, and the relative equations relating Se enrichment in soybean sprouts (Y) against watering days (X) were Y=32.505X-36.17 (T1), Y=88.46X-92.04 (T2), and Y=251.11X-254.9(T3). The averaged total levels of Se-enrichment in the whole mungbean sprouts at T1, T2, and T3 group were 0.05, 3.64, and $101.43{\mu}g/DM$ g, respectively, and the relative equations relating Se enrichment (Y) to watering days (X) for mungbean sprouts were Y=1.67X-1.3467 at T1 and Y=48.035X-46.907 at T2. The results of this study suggest that soybean sprouts and mungbean sprouts enriched with bioavailable Se can be produced on a large scale by Se supplementation, allowing for the development of healthy functional foods such as Se-enriched mungbean sprout soups and salads, Se-enriched functional drink and food additives, and selenium tablets to promote health.