• Applied Microscopy
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• 제50권
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• pp.21.1-21.3
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• 2020

Sample preparation is significantly important to the high-resolution transmission electron microscopy (HRTEM) characterization of nanomaterials. However, many general organic solvents can dissolve the necessary organic polymer support layer in TEM grid, which causes it difficult to obtain high-quality samples of oil-soluble nanomaterials. In this study, a new sample preparation method for oil-soluble nanomaterials has been developed by using the sublimable material as a transition layer. Experiments also show that there is no damage to TEM grids and high-quality HRTEM images can be obtained via this method. This approach paves the way to applicable HRTEM sample preparation of oil-soluble nanomaterials.

• 한국응용과학기술학회지
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• 제36권2호
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• pp.635-644
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• 2019

본 연구의 목적은 arbutine과 유용성감초추출물 혼합물의 미백 효과를 조사하는 것이다. B16 melanoma 세포에서 알부틴 및 유용성 감초 추출물의 tyrosinase 활성과 멜라닌 생성 억제 효과를 시험관내에서 평가하여 미백 효과를 측정 하였다. B16 흑색 종 세포를 이용한 MTT 분석은 혼합물 (알부틴과 유용성감초추출물)이 세포독성이 없음을 확인하였다. 유용성 감초 추출물과 알부틴은 모두 mushroom tyrosinase 활성이 농도 의존적 효과를 보였다. 혼합물은 다양한 농도 (유용성감초추출물 : 알부틴 = 1 : 1, 1 : 1.5, 1 : 2, 1 : 2.5, 1 : 5)에서 B16 melanoma 세포에서 40-51 %의 tyrosinase 활성을 유의하게 억제하였다. 또한, 시험한 모든 혼합물은 B16 melanoma cell의 멜라닌 함량을 50 % 이상 감소시켰다. 이러한 결과는 알부틴과 유용성감초추출물 혼합사용 시 미백 활성에 효과적임을 시사하는 바이다.

• 한국지역사회생활과학회지
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• 제16권3호
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• pp.127-132
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• 2005

The aim of this study is to investigate the effects of hot water soluble extract from Angelicae Radix on the components of serum and liver and the effects on the antioxidant system. For this purpose, five experimental groups were set up. And for fat source, perila oil enough with unsaturated fatty acid and beef tallow enough with saturated fatty acid were supplemented to the rats together with hot water soluble extract from Angelicae Radixs. Five experimental groups kept eight Sprague-Dawley rats respectively. They were CO group supplemented with basic diet of AIN-93, PO group supplemented with perila oil, POA group supplemented with perila oil and hot water soluble extract from Angelicae Radix, BT group supplemented with beef tallow, and BTA group supplemented with beef tallow and hot water soluble extract from Angelicae Radix. The results were; 1) Final weight, weight gain, fluid intake and FER were not different significantly among the experimental groups, 2) Significant difference of food intake was observed(p<0.05) in BTA group only, 3) No significant difference was observed in serum total lipid, serum triglyceride and HDL cholesterol among experimental groups. Serum total cholesterol and LDL cholesterol were significantly low(p<0.05) in the group supplemented with beef tallow which was with hot water soluble extract from Angelicae Radix (BTA group). 4)Liver total cholesterol in liver was low in groups supplemented with perila oil and hot water soluble extract from Angelicae Radix. In summary, hot water soluble extract from Angelicae Radix did not affect the weight gain, fluid intake and food efficiency ratio among the experimental groups, but had an effect of lowering food intake, serum total cholesterol and serum LDL cholesterol significantly in the groups which were supplemented with beef tallow and hot water soluble extract from Angelicae Radix. The effect of lowering liver total cholesterol with the supplementation of hot water soluble extract from AnRelicae Radix was observed in perila oil group only. The effect of lowering cholesterol with the supplementation of hot water soluble extract from Angelicae Radix was observed both in serum and in liver.

• 한국환경과학회지
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• 제13권4호
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• pp.403-412
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• 2004

Waste water-soluble cutting oil was treated with WI type #1 and WI type #2. The properties of the original water-soluble cutting oil were pH=l0.4, viscosity=1.4cP, CODcr=44,750 ppm, and TOC=10,569 ppm. However, the properties of the oil used for more than 3 months were changed to pH=7.82, viscosity=2.1cP, CODcr=151,000 ppm, and TOC=74,556 ppm. It might be attributed to the fact that molecular chains were cut due to thermal oxidation and impurities such as metal chips were incorporated in to the oil during the operation processes. To prevent the putrefaction of oil, the sterilization effect of ozone and UV on the microorganism in the oil was investigated. Ozone treatment showed that 99.99% of the microorganism was annihilated with 30 minutes contact time and 60 minutes were necessary for the same effect when UV was used. Ozone treatment could cut molecular chains of the oil due to strong sterilization power, which was evidenced by the increase of TOC from 25,132 ppm at instantaneous contact to 28,888 ppm at 30 minutes contact time. However, UV treatment didn't show severe changes in TOC values and thus, seemed to cause of severe cut of molecular chains. When the activated carbon was used to treat the waste water-soluble cutting oil, TOC decreased to 25,417 ppm with 0.lg carbon and to 15,946 ppm with 5.0g carbon. This results indicated that the waste oil of small molecular chains could be eliminated by adsorption. From the results, it could be concluded that these treatment techniques could be proposed to remove the waste oil of small molecular chains resulting in the degradation of the oil properties. In addition, these experimental results could be used for the correlation with future works such as investigation of the molecular distribution according to the sizes, lengths, and molecular weight of the chains.

• 한국응용과학기술학회지
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• 제33권4호
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• pp.836-847
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• 2016

본 연구는 바이오매스를 열분해하여 생성된 수상오일(water soluble oil)을 얻었다. MDO(Marine Diesel Oil)와 수상오일을 유화시켜 생성된 에멀젼 연료의 특성과 배출가스를 연구 하였다. 바이오매스로는 톱밥을 사용하였고 $500^{\circ}C$에서 열분해하여 생성된 물과 탄화수소를 응축시켜서 수상오일을 얻었다. 수상오일을 MDO에 10~20% 까지 혼합 후 유화시켜 에멀젼 연료를 만들었다. 엔진 배출가스 측정은 엔진 dinamometer로 실시하였다. 유화연료는 연소실내에서 미세폭발을 일으켜 연료를 잘게 쪼개어 주어 smoke를 감소시킨다. 그리고 물이 연소실내의 기화열을 빼앗아 연소실 내부의 온도를 낮추어 NOx 생성을 억제하는 효과를 갖는다. ND-13모드의 각 모드별 배출가스온도가 MDO에 비해 유화연료를 사용했을 때 낮게 나온 것으로 뒷받침 될 수 있었다. 유화연료의 함수율이 증가함에 따라 NOx와 smoke의 배출량은 줄어들었으며, 출력도 함수율 증가에 따라 유화연료 자체의 발열량 감소로 인하여 줄어든 것으로 판단된다. ND-13모드에서 MDO 유화연료를 시험한 결과 바이오매스오일 함유량 20%인 유화연료의 NOx 감소량은 약 25%, smoke의 총감소량은 약 60%, 그리고 약 15%의 출력손실을 확인하였다.

• 열처리공학회지
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• 제35권6호
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• pp.337-342
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• 2022

In metal cutting, water-soluble cutting oil is used for cooling the surface of the workpiece and improving the surface roughness. However, waste cutting oil contains preservatives and surfactants, and if it is discarded as it is, it has an great influence on environmental pollution. For this reason, regulations on the use of cutting oil are being stricter. Hence, the development of eco-friendly treatment technologies is required. In this study, a diamond electrode doped with boron on a niobium substrate was deposited by thermal filament chemical vapor deposition and waste cutting oil was treated using an electrochemical method. Compared to the total amount of organic carbon contained in the waste cutting oil, it was confirmed that the boron-doped diamonds developed from this study showed much better performance than electrodes that has been widely used before.

• Journal of Advanced Marine Engineering and Technology
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• 제30권1호
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• pp.88-92
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• 2006

This study is intended to check the flame temperature to raise in burning grade C heavy fuel oil and emulsion fuel oil in a boiler and to measure the concentration of Dry Shoot(DS) and Soluble Organic Fraction(SOF) after collecting the Particulate Matters (PM). The flames temperature in boiler was measured by burning grade C heavy oil and oil-water emulsion (C heavy oil $70\%\;and\;30\%$ of water) Combustion characteristics of two fuels was also compared by trapping particulate matters (PM) in exhaust gas and measuring the generated quantities of DS and SOF in fuel gas.

• Journal of Korean Dental Science
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• 제2권1호
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• pp.11-18
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• 2009

The purpose of this study was to investigate the possibility to reduce the toxicity of oil based root canal sealers containing calcium hydroxide using MTT & agar overlay assays. Thus some formulations of traditional root canal sealers were replaced with oil-soluble solvents and experimental root canal sealers manufactured. In MTT assay, Cell viability of all experimental sealers in addition with oil soluble solvents were observed significantly higher than both control groups, especially according to replace zinc and/or calcium ion components. Also agar overlay assay was appeared moderate to no cell responses into modifying both zinc and/or calcium ion components and oil soluble solvent weight. Authors found the reducing effect of cell toxicity through significant role of oil soluble solvent factor into root canal sealer containing calcium hydroxide.

• 환경위생공학
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• 제13권3호
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• pp.121-127
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• 1998

This study investigated exposures to oil mist obtained from an cutting oil manufacture shop and 5 machining shops and also analysis of some oils. The results were that geometric average concentrations of oil mist were $0.29 mg/m^3$, which was less than current $TLV(5mg/m^3$) in Korea. The proper case of either type of system will ensure that atmospheric concentrations of oil mist in machine shops will be within the TLV. It should be remembered, however, that this TLV was established before there was any suggestion that in the inhalable of oil mist might rarely be carcinogenic, and so it seems prudent to keep atmospheric content as low as possible. The analysis of insoluble cutting oils with GC-MSD showed that considerable suspected PAHs were contained. But soluble cutting oil(KSM-W2) didn't almost contain PAHs.

• 한국식품과학회지
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• 제32권2호
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• pp.469-476
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• 2000

식품의 주요성분이 항균 활성 분획물의 항균 활성에 미치는 영향을 살펴보기 위해 액체 배지에 casein, soybean oil 및 soluble starch를 일정 수준으로 첨가하여 최종 농도를 1% 및 3%로 조정한 후 항균 활성이 우수한 예덕나무 조 추출물인 hexane 분획물 및 linolenic acid를 50 ppm 및 1,000 ppm 수준으로 첨가한 액체 배지에 L. monocytogenes 2 균주를 접종, $30^{\circ}C$에서 72시간 동안 배양하면서 생균수를 계수하였다. Hexane 분획물 1,000 ppm과 3% casein이 첨가된 처리구는 초기 균수가 $10^7\;CFU/mL$ 수준이었으나 72시간에서 $10^8\;CFU/mL$ 수준으로 증식하여 hexane 분획물 1,000 ppm의 항균 활성은 3% casein에 의해 완전히 저해되었으며, linolenic acid 1,000 ppm의 항균 활성은 3% casein에 의해 활성이 부분적으로 저해되었다. Soybean oil(1%, 3%)의 경우 linolenic acid 1,000 ppm의 항균 활성은 3% soybean oil에 의해 활성이 부분적으로 저해되었으며, soluble starch(1%, 3%)와 hexane 분획물 1,000 ppm이 첨가된 처리구는 48시간 이후 균이 검출되지 않거나(1% soluble starch), 또는 5 log cycle 정도 감소하였으며(3% soluble starch), soluble starch(1%, 3%)와 linolenic acid 1,000 ppm이 첨가된 처리구는 48시간 이후 균이 검출되지 않았다. 이상의 결과로 볼 때 soluble starch(1%, 3%)는 hexane 분획물 1,000 ppm 및 linolenic acid 1,000 ppm의 항균 활성을 저해하지 않는 것으로 나타났다.