• Journal of Nutrition and Health
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• 제36권8호
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• pp.819-827
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• 2003

Linoleic acid [LA; 18: 2 (n-6)] is the most abundant polyunsaturated fatty acid in human skin. The exclusion of LA from diet induces epidermal hyperproliferation, which is reversible by the inclusion of LA in diet, and hence, LA is heralded as an essential fatty acid (EFA). Since safflower oil (SO) has been widely recognized as the major dietary source of LA and Arctii Fructus (Arctium lappa L.) is recently reported to contain high level of LA, we compared the antiproliferative effects of SO and Arctii Fructus in this study. Epidermal hyperproliferation was induced in guinea pigs by hydrogenated coconut oil (HCO) diet for 8 wk. During following 2 wk, EFA deficient guinea pigs were fed diets of safflower oil (group HS), water extract of Arctii Fructus (group AW) or organic extract of Arctii Fructus (group AO). Normal control group was fed SO containing diet (group SO) and EFA deficient group was fed HCO containing diet (group HCO) for 10 wk. Epidermal hyperproliferation was reversed in groups AO (55.9% of group HCO) and HS(74.1% of group HCO). However, the thymidine incorporation into epidermal DNA of group HS was greater than of normal control group SO. Epidermal hyperproliferation was not reversed in group AW. The accumulations of LA into phospholipids and ceramides, and of 13-hydroxyoctadecadienoic acid (13-HODE), the potent antiproliferative metabolite of LA in the epidermis of group AO were greater than of group HS. In contrast, the de novo synthesis of ceramides, the major lipids maintaining epidermal barrier, did not differ between all of groups. Together, our data demonstrate that organic extract of Arctii Fructus is more prominent than safflower oil in reversing epidermal hyperproliferation by inducing the higher accumulations of LA and 13-HODE in the epidermis of guinea pigs.

• 한국응용과학기술학회지
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• 제6권2호
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• pp.89-104
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• 1989

The purpose of the study was to find an effect of phospholipid-free vegetable oils on the serum lipids and proteins of Sprague-Dawley rats. All experimental rats were fed ad libitum for 60days with the mixture of starch: casein: salt mixture: vitamin mixture (60:18:4:1) and at the same time fed administratively with 1 ml of soybean oil, corn oil and sesame oil bought in market as source of phospholipid-free vegetable oils(PFVO) and those extracted directly by and oil press as source of phospholipid-containing vegetable oils(PCVO) respectively. At the last day of experimental period, the rats were fasted for 12 hours and decaptitated to collect blood for analysis of serum lipid and protein. The results of this study were summerized as follows. 1. The supplementation of dietary phospholipid decrease food efficiency ratio and the growth rate of experimental rats. 2. The supplementation of dietary phospholipid improve correlation coefficient of body weight and organ weights. 3. The supplementation of dietary phospholipid increase the level of serum phosphatidylethanolamine. Therefore, I think that we must eat dietary phospholipid unpurified from vegetable oil to prevent development of atherosclerosis and fat liver.

• Journal of Nutrition and Health
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• 제23권2호
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• pp.81-92
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• 1990

Ten college women were treated with either corn oil(CO< as a source of C18:2, $\omega$6) or fish oil concentrates(FO, as a source of C20:5+C22:6, $\omega$3) with experimental diet for 7 days and then returned to normal home made diet. Kinetic changes of plasma and RBC lipids, tocopherol, MDA levels and hemolysis were observed at day-0, -3, -7, -8, -10, -14 and -21 of experimental periods. Plasma and RBC tocopherol contents were significantly increased at day-3 and -7 by tocopherol tocopherol supplement in dietary oil, but there was no significant difference between CO and FO diet with large dose of tocopherol supplement. After stop experimental regimen at day-7, plasma tocopherol content was sustained at high level until day-10 but drastically decreased at day-14 and remained at low level at day-21. However, RBC tocopherol level was not greatly responded to the dietary intake of tocopherol and was varied in the very narrow range. MDa levels of plasma and RBC were not responded in the same way as tocopherol content of plasma. MDa content of RBC was very low compared to that of plasma. RBC hemolysis by incubation in hypotonic solution was negatively correlated to plasma tocopherol level and was not correlated to the level of MDa in either plasma or RBC. There were no significant change in the levels of plasma cholesterol, HDL-chol, triglyceride, phospholipid, and lipoprotein pattern throught experimental periods.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.2129-2134
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• 2004

The present study has been conducted to develop a heat pump system using river water of temperature energy which not only belongs to unutilized energy but is a kind of good heat source due to maintain its temperature in a certain degree regardless of seasonal variation. The system did not meet the proposed performance after setup. In this paper, the system performance affected by refrigerant Oil, by pressure drop, or by other factors has been discussed. The followings were obtained : (1) Refrigerant Oil mixture rate was 2.5 in weight percentage, (2) Pressure drop through evaporator was 29.1kPa($3.1^{\circ}C$ in saturated tempearture) (3) Pressure drop from the end of evaporator to compressor inlet was 39.8kPa($4.0^{\circ}C$ in saturated tempearture). (4) The system performance can to be improved by modifying a part of pipe line to compressor, and reducing pressure drop through heat exchangers.

• 한국지하수토양환경학회지:지하수토양환경
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• 제8권4호
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• pp.64-67
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• 2003

잠재오염원에서 누출된 유류의 기원을 확인하기 위해서 표준연료와 환경시료중의 유류 구성성분의 농도를 분석하였다. pristane/phytane의 비는 환경시료 중 같은 휘발성을 가지고 있기 때문에 실질적으로 변하지 않는다. 이것은 미생물분해와 풍화의 영향을 평가하고 유류의 오염원을 확인하는데 유용하였다. L과 S 주유소에서 백등유, 보일러등유, JP-8, 경유의 pristane/phytane 비를 측정하였다. L-백등유와 JP-8에서 pristane/phytane 비는 각각 3.10$\pm$0.03, 1.77$\pm$0.01였으며, 유류와 물을 분배시킨 후 물층에서 pristane/phytane 비는 백등유 2.97$\pm$0.02, JP-8 1.65$\pm$0.02였다. pristane/phytane 비는 백등유와 JP-8을 구분하는 유효하였으며, 또한 관측정에서 수집된 자유상유류와 지하수시료에서 유종을 확인하는데 유용하였다.

• Journal of Nutrition and Health
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• 제36권8호
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• pp.785-792
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• 2003

This study is conducted to determine the effects of dietary source of $\omega$3 fatty acids on preneoplastic foci and the glutathione dependent enzymes in rat hepatocarcinogenesis initiated by diethylnitrosamine (DEN). Male Sprague-Dawley rats were fed one of three diets containing 10% (w/w) fats fixed p/s = -1.0 and $\omega$6/$\omega$3 ratio = -0.4 or 4.0 ; fish oil-com oil blended (FC), com oil-beef tallow-fish oil blended (CF), com oil-beef tallow-perilla oil blended (CP), from gestation period. At 10 weeks, animals of experimental groups were injected intraperitoneally with DEN (200 mg/kg body weight) and two-thirds partial hepatectomy was carried out 3 weeks later and were sacrificed 8 weeks after DEN initiation. The area and number of glutathione S-transferase placenta (GST-P) positive foci were significantly decreased in rats fed diets containing fish oil (FC and CF) than those fed perilla oil diet (CP). Fish oil feeding significantly increased the activities of glutathione dependent enzymes. Rats fed diets containing fish oil (FC and CF) significantly increased the glutathione (GSH) content and the activities of glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione S-transferase (GST). Glutathione dependent enzymes had significantly negative correlation with GST-P positive foci. Glucose 6-phosphatase (G6Pase) was increased in rats feeding fish oil. Thiobarbituric acid reactive substances were not different among groups. Therefore, the preventive effect against hepatocarcinogenesis might be explained by induction of the glutathione dependent enzymes and G6Pase. (Korean J Nutrition 36(8): 785∼792, 2003)

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1996년도 경북지부 결성 및 추계학술발표회 논문집
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• pp.114-117
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• 1996

Biodegradation potential of crude oil has been studied in liquid and soil slurry culture. Studies were performed to optimize the factors affecting metabolic activity. Arabian Light(sulfur content 1%) was used as a representative crude oil and Nocardia sp. was selected as an oil degrading microorganism based on its ability to degrade and emulsify Effects of various nutritional and environmental conditions as well as emulsification and surface tension were observed. Tentative optimization of environmental and nutritional condition were as follow; pH 8, sodium nitrate as inorganic nitrogen source, yeast extract 0.05%, phosphate concentration 0.25% and glucose addition of 1.0% (w/v basis), extent of degradation to 78 %.

• 한국작물학회지
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• 제47권
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• pp.163-174
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• 2002

Peanut is one of the principal oil seeds in the world as a rich source of edible oil and protein. Peanut quality arises as a result of a complex interaction of genetic, physiological and biochemistry processes that produce the chemical composition of the peanut seed. The major factors influencing seed quality are degree of maturity and digging and drying, curing and storage as a series of harvesting. The end products, peanut butter, salted seed, confections, roasting stock and by-products are favored in world-wide because of their unique roasted peanut flavor, Literatures are reviewed mainly focusing on the physiological properties and nutritional quality of oil, protein and flavor in peanut. Chemical properties of protein and oil, and volatile flavor component in peanut seeds are studied. The objectives of this paper were to review and summarize the results obtained from the improving quality breeding program and evaluation of the chemical composition in peanut up to now.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제52권10호
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• pp.481-486
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• 2003

It is well known that a discharge in oil is the source of various physical phenomena. Ultrasonic-wave detection is a useful method to the diagnosis of the transformer-insulation condition. Conventionally, ultrasonic waves are detected by Piezo-electric transducer, and we use optical method that has many advantages. In this paper, we constructed a Mach-Zehnder interferometer with optical fiber and investigated the principle of operation. Test arrangement is based on the needle-plane electrode system in oil and applied AC high voltage. Ultrasonic waves were detected and analyzed with wavelet transform.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.1079-1081
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• 1998

This paper describes the dissipation factor measuring device for insulating oil in operating pole transformer by DSP(digital signal processor). After applying voltage to the sensor which is installed in a transformer, acquire source voltage and current of sensor using FFT techniques, then we could evaluate the dissipation factor of insulating oil. To improve measuring accuracy and processing speed, we use TMS320C31 DSP, FFT and data analysis techniques. Also we suggest deterioration criterion of insulating oil and compared the developed diagnosis device with schering bridge on deteriorated insulating oil. The result of this paper show that the developed measuring device can be used as diagnosis device for the pole transformers.