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        검색결과 202

        141.
        2009.06 KCI 등재 구독 인증기관·개인회원 무료
        Human GH (hGH) has been available over 40 years for the treatment of children with GH deficiency. Human growth hormone (hGH) is mainly produced in the somatotrophic cells of the pituitary in brain and is the product of the GH-N gene. Among the edible mushrooms, the king oyster mushroom (Pleurotus eryngii ) is one of the most popular mushrooms in Asia, Europe and North America. The increasing popularity of P. eryngii among consumers is due to its flavor, texture and shelf life. We report a modified Agrobacteriummediated method for the efficient transformation of hGH2 in Pleurotus eryngii . The binary vector pCAMBIA1304 was used for the initial transformation and detected by GUS and GFP. Infiltrated samples transformed with pCAMBIA1304 showed a wider GUS response than the co-cultivated in the 50㎍/㎖ hygromycin selection medium. This transformation technique offers new prospects for the production of useful protein in the genetically improved mushroom.
        142.
        2009.03 구독 인증기관 무료, 개인회원 유료
        This study was carried out to investigate effect of herbal extracts mixtures on hair growth in an alopecia model of C57BL/6 mice. There were 4 experimental groups including distilled water (DW, negative control), 25% ethanol(EtOH, vehicle control) and two herbal extract mixtures (HE-1 and HE-2). HE-1 included Polygonum and Brassica campestris extracts and HE-2 included Mulberry root and Gardenia extracts. The 6 weeks-old C57BL/6 male mice were shaved with an electric clipper and the test compounds were topically treated with 0.2 ml per mouse daily for 3 weeks. The hair re-growth was photographically determined at days 0, 4, 7, 10, 14, 17, and 21. The number of mast cells which is an important modulator of hair growth was counted in 1 cm of dorsal skin section of mice. There were no clinical signs in all experimental groups. As the results of photometric analysis, the topical application of the herbal extracts (HE-1 & 2) for 2 weeks to dorsal skin accelerated hair re-growth remarkably faster than that of DW group (p<0.05). Activity of alkaline phosphatase (ALP) was significantly increased in EtOH group compared to DW group (p<0.05). Both herbal extract mixtures also increased the ALP activity, but it was not significantly different from DW. Treatment of mice with HE-2 significantly increased mast cell population compared to EtOH. Taken together, these results suggest that herbal extract mixtures used in this study may have hair-growth promoting activities and can be useful for treatment for male pattern baldness or alopecia in humans.
        4,000원
        144.
        2006.03 구독 인증기관 무료, 개인회원 유료
        Concerns remain regarding the biocompatibility and adverse effects of dental casting alloys. The aim of this study was to understand the cytopathogenic effect of metal ions, which might be released from dental alloys, on oral squamous carcinoma(OSC) cells. The cellular morphology, viability, the type of cell death and molecular change in response to metal ion salt solutions including aluminum(Al), cobalt(Co), copper(Cu) and nickel(Ni) were examined. The values for the metal ions with the exception of AI were estimated to be between 400 and 600μM. The cells treated with the metal ions showed apoptotic change with the exception of Al ions. Metal ion-induced apoptosis was further confirmed using flow cytometric analysis. This study showed that the cytotoxicity and the mode of cell death by metal ions clearly depend on the cell type, the type of metal ion and the duration of exposure. The protein level of Rb, a tumor suppressor that affects apoptosis para-doxically, was higher in the cells treated with Co, Cu and Ni. It is believed that apoptosis and cell damage in the OSC cells treated with Co, Cu or Ni can be evoked by the regulation of Rb.
        4,000원
        145.
        2003.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        4,500원
        147.
        2002.10 구독 인증기관 무료, 개인회원 유료
        We give efficient algorithms for finding shortest distances in special types of sparse network where the networks are composed of series of subnetworks which form circles. The algorithms presented in this paper are so called extensions of the non-circular sparse network algorithms The suggested algorithm is composed of two approach parts for only donut shaped sparse network, the one is the node elimination approach and the other the arc elimination approach, Our algorithms for finding all shortest distances can be extended in general circular sparse networks.
        4,000원
        151.
        1998.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The results from the Individual Plant Examination of External Event of Yonggwyang nuclear power plants, unit 3 & 4, in Korea have shown that the high degree of diversities of the experts' opinions on seismicity and attenuation models is su, pp.sed to be generic cause of uncertainty of APEs(annual exceedance probability) in the PAHA(probabilistic seismic hazard analysis). This study investigated the sensitivity of the focal depth, which is one of the most uncertain seismicity parameters in Korea, Significant differences in resultant values of annual exceedance probabilities and much more symmetrical shape of the resultant PDFs(probability density functions), in case of consideration of focal depth, are found. These two results suggest that, even for the same seismic input data set including the seismicity models and ground motion attenuation models, to consider focal depth additionally for probabilistic seismic hazard analysis evaluation makes significant influence on the distributions of uncertainties and probabilities of exceedance per year for the whole ranges of seismic hazard levels. These facts suggest that it is necessary to derive focal depth parameter more effectively from the historical and instrumental documents on earthquake phenomena in Koran Peninsula for the future study of PSHA.
        3,000원
        152.
        1998.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        개구부를 갖는 콘크리트 전딴팩출 뚜께가 않은 직사각형 핑판으로 모넬화 하였다 판의 두가지 경제 조건에 대한 안 정해석 칠꾀를 판좌굴제수 k료 표시하였다 경계 조건이 다른 변수로는 휩‘으로 인한 힘/떤직웅}중비 α 수펑 전단력/연 적히·중비 a 빛 게구부의 위치 및 크기 변화이다- 유한요소법에 외한 겔과륜 얻기 워하여 예제의 판을 2ï x9의 정사각 형 요소로 분할하였며 node에서 3가지 지유도를· 갖는 cn 유한요소플 택하였다? 일반적요로 개구부의 크기기 종기함 에 따라 편 깨구샤가 판 중앙에서 자유연 αree ec!ge) 요로 접근할수록 좌갈계수는 감소하는 현상윷 보이고 있따,
        4,000원
        154.
        2019.10 서비스 종료(열람 제한)
        Achondroplasia is associated with craniofacial abnormality, musculoskeletal deformations, and respiratory, cardiovascular abnormalities. So, anesthetic management is one of clinical challenges. Herein, we report and discuss a case of achondroplastic patient underwent osteosynthesis for femur fracture, which was chosen on the base of patient’s anatomical and physiological characteristics. The patient had thoracolumbar kyphosis (21.8°), previous spine surgery, short neck, obstructive sleep apnea, and mild cervical limitation. Intubation was conducted with smaller cuffed endotracheal tube under videolaryngoscope guidance. Mechanical ventilation was applied with volume control mode, using a tidal volume of 8-10 ml/kg without positive end-expiratory pressure. The patient was supine after placing support under shoulders and head during intubation and surgery. Intraoperative body temperature was maintained using air-forced waring blanket. Complete and careful preoperative evaluation is absolutely important to select the appropriate anesthetic method. Ideal anesthetic management in each case should be based on an individualized decision-making.
        155.
        2018.09 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        본 연구는 완주에서 재배된 세계 주요 11개 적포도 품종으로 제조된 적포도주의 향기 성분을 headspace-solid phase microextraction 분석법으로 확인하였다. 향기성분은 총 75종이 확인되었다. 아로마화합물은 그들의 OAV 값에 의해 5 그룹으로 나뉘었다. 알콜, 알데하이드, 에스테르, C6 화합물이 11개 적포도주의 주요한 향기성분이었다. Isoamy alcohol 알콜과 phenylethyl 알콜은 11개 포도주에서 공통적으로 꽃향기, 달콤한 향을 나타내는데 중요한 물질이었다. Octanoic acid, ethyl ester, hexanoic acid ethylester은 모든 레드와인에서 과실향과 꽃향, 달콤한 향을 내는 중요한 성분이었다. 1-Hexanol은 모든 포도주에서 분석되었으나 풀향을 나타내는 향으로 나타났다. Chanceller, Malbec, marchel, Nsrsha, Pinot Meunier, Sangiovetto 포도주의 주요 향기성분은 과실 향인 것으로 나타났으며 Cabernet Franc, Cabernet Sauvignon, Sauvignon Vert 포도주의 주요 향기성분은 풀향인 것으로 조사되었다. 또한, MBA와 Narsha 포도주의 경우 꽃향이 주요 향인 것으로 조사되었다. 본 연구 결과를 바탕으로 적포도주용 품종을 육성할 때 선발기준으로 향기성분 분석을 활용할 수 있을 것으로 판단되었다.
        156.
        2018.04 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        The study compared the juice and wine odorants of the Cheongsoo grape cultivar with those of Chardonnay and Reisling wines. The volatile compounds of the three grape varieties were analyzed using headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry. The most common volatile compounds in the juices from the three cultivars were terpenes, C13-norisoprenoids, etones, alcohols, and aldehydes. Terpenes were established as the most abundant group of volatiles in Cheongsoo grape juice, where as aldehydes predominated in Chardonnay and Riesling juices. Forty-two volatile compounds (acids, alcohols, esters, and others) were detected in the three white wines. The concentration of esters was about four times higher in Cheongsoo wine than in Chardonnay and Riesling wines. Five esters found in the Cheongsoo wine, namely, isoamyl acetate, ethyl butanoate, ethyl hexanoate, ethyl octanoate, and ethyl decanoate, exhibited high odor activity values (OAV) of >1. Furthermore, only Cheongsoo wine had a high OAV for isoamyl acetate odorant, which is associated with banana and sweet aromas. Therefore, the abundant and varied esters are believed to be key volatile fruity/sweet odorants in Cheongsoo wine.
        157.
        2017.05 서비스 종료(열람 제한)
        Background: Mahonia Nepalensis DC. (Hoang lien o ro), the specie of the family Berberidaceae, is widely distributed in the high mountainous areas at altitudes 1700 – 1900 m of Vietnam. It is found that the stem of Mahonia nepalensis indicated anti-inflammatory, anti-bacterial and antifungal activities and they are used particularly for the treatment of eczema, psoriasis, and other skin conditions. However, no study on the antioxidant and anti-cancer activities of Mahonia Nepalensis stem has been previously reported. The aim of this study was to evaluate anti-oxidant and anti-cancer activities of Mahonia Nepalensis stem. Methods and Results: The stem pieces of Mahonia Nepalensis were dried and extracted three times with 100% methanol. After that, the extract was suspended in distilled water and then partitioned with n-hexane, ethyl-acetate (EtOAc) and butanol (water saturated BuOH) fractions were then evaporated using a vacuum rotary evaporator. Evaluation of the anti-oxidative activity of Mahonia Nepalensis was carried out using a DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-producing system. The results revealed that the ethyl acetate fraction of M. nepalensis possessed higher potential DPPH radical scavenging activity (IC50, 81.88 ± 1.33㎍/㎖) than other fractions as well as BHT (2,6-Di-tert-Butyl-4-methylphenol) (IC50, 250.49 ± 1.60㎍/㎖). The reducing power assay was also investigated and EtOAc fraction showed higher absorbance values than other fractions. At 1.0 mg/ml concentration, EtOAc fraction showed absorbance of 1.72, be higher than Ascorbic acid. Cell viability was evaluated according to the MTT (3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyl tetrazolium Bromide) assay. By MTT assay, all fractions showed a significant reduction in cell viability on COLO 205 (Human colon carcinoma cell) at the highest concentration tested (200㎍/ ㎖) with over 70% decrease in cell viability was obtained, and the highest significantly inhibiting effect occurred in butanol fraction with approximately 90% reduction in cell viability. Conclusion: We demonstrated that Mahonia Nepalensis stem extract has highly potential in anti-cancer activity. Further studies are necessary in order to explore the variety of Mahonia Nepalensis stem to be applied as a valuable natural material.
        158.
        2017.05 서비스 종료(열람 제한)
        Background : The hyphal growth of Poria cocos are known to grow well under medium temperature(25 - 28 ℃) and acidic(pH 4.0 - 5.0) conditions. Also, it is known that a large difference in the yield of Poria cocos depending on the cultivation method and environment. Therefore, this research was carried out to secure stable yield of Poria cocos using plastic house and bed soil. Methods and Results : The inoculation time was in mid-April 2016 and the inoculation amount was 3/4 lb each in pine trees of 60 (L) × 10 (D) ㎝. The inoculated wood was buried directly in the bed by soil composition and growth characteristics investigated after cultivating in plastic house from April to September, 2016. The composition of the bed soil was 6 treatments using peatmoss, cocopeat and perlite. The combination ratio ranges of peatmoss, cocopeat and perlite were 0 to 80 %, 0 to 60 % and 20 to 60 %, respectively. We assumed that the combination ratio of peatmoss (organic material) 60 % : perlite(inorganic material) 40% is good for the growth of the Poria cocos. In this ratio, instead of peatmoss, the amount of cocopeat was replaced by 20, 40, and 60 %, respectively. The pH and EC range of bed soil was 4.8 - 5.6, 0.7 - 2.2 dS/m, respectively. pH and EC tended to be lower in treatments with only peat moss and perlite. On the other hand pH and EC tended to raise with increasing cocopeat content. Volumetric soil water content and soil temperature were in the range of 13 - 28 % and 20 - 29℃, respectively, during the period of July to September. Soil water content tended to be higher with increasing cocopeat and peatmoss content and soil temperature tended to be lower. The degree of initial hyphal development and sclerotia formation were good in all treatments compared to the control. However, the number of sclerotia was 6 times higher in the ② treatment than in the control. The size of sclerotia was also the best at 12 (L) × 8 (W) ㎝ in the ② treatment. Conclusion : As a result of cultivating Poria cocos in plastic house, growth characteristics were different according to composition of bed soil. The first reason for this result is that the difference of soil moisture content depending on organic matter content affected the soil temperature. Actually, the average soil water content and soil temperature of ① treatment (organic material 80% ) showed 24% and 22℃ respectively during July to September, and no sclerotia was formed. However, in the ② treatment(organic material 60%), the average soil moisture and soil temperature were 14% and 26℃ during July to September, respectively and sclerotia formation was good. Another reason is that the pH of the bed soil affects the formation of sclerotia. Overall, the degree of hyphal development was good in low pH treatments, but no significant difference was found between the pH and the formation of sclerotia.
        159.
        2017.05 서비스 종료(열람 제한)
        Background : Cynanchum wilfordi is a typical myocardial medicinal crop. Because it penetrates more than 1m, it requires a lot of labor and harvesting costs. In addition, we needed 4 - 5 times of weeding until July, and in the soil with poor drainage, root rot disease occurs and yield is greatly reduced. Therefore, this study was conducted to develop new cultivation technology that can minimize the effort cost and increase the yield. Methods and Results : As a test material, container standards were used plume tube of diameter 30 ㎝ × height 50 ㎝, 80 ㎝, 100 ㎝. The culture soil manufactured by mixing cokofit 60%, peatmoss 10%, pearlite 6%, vermiculite 10%, zeolite 5%, and charcoal 5%. The compost was made by mixing fowl droppings 45% and cattle manure 5%. The mixing ratio of the culture soil and the compost was 100 : 0, 90 : 10, 80 : 20, 70 : 30, respectively, and the mixture was filled in the container. Cynanchum wilfordi seedling sow raising seedlings during one month seeds become dormancy breaking. Culture soil and container of Cynanchum wilfordi was effective 87% increase (384 ㎏/10 a → 720) in quantity contrast conventional culture in height 50 ㎝ container + culture soil 100 : 0. 80 and 100 ㎝ containers were found to be unsuitable for production throughout the year because of thin thickness of subterranean part and low commercial yield due to the long time required for roots to reach the hardpan layer. The yields of compost mixture decreased from 0% (720 ㎏/10 a) > 10% (642) > 20% (560) > 30% (475) in 50 ㎝ containers. When the compost content was more than 20%, the yield decreased due to physiological damage during the early growth. Conclusion : The culture soil and container cultivate for harvesting ease of Cynanchum wilfordi was effective saving more than 15 times more than the harvest time contrast manpower harvest and the yield was increased by 87%. Also, container cultivation was effective the cost cutting of installation dismantlement and redres since no need to move the cultivation area.
        160.
        2017.05 서비스 종료(열람 제한)
        물은 22.1 MPa의 압력하에 100℃ - 374℃의 온도범위에서 액체상태로 존재하며, 이를 아임계수라 한다. 아임계수 조건에서 물은 분자간 수소결합이 약해지면서 유전상수, 점성, 표면장력이 감소되어 유기용매와 유사한 특성을 지니게 된다. 원유오염토양은 전남 여수지역 공단 내에 있는 유류로 오염된 토양을 이용하였으며, 오염기간은 약 1년이며 저분자성 휘발유류성분 및 고분자성 유류로 오염되어 있었다. 초기 오염된 TPH농도는 16,895 mg/kg였다. 원유오염토양은 고분자성 물질이 다량 함유되어 있어 기존정화방법으로는 처리하기 어려운 점이 있다. 이를 해결하기 위하여 상기 아임계수 특성을 이용하여 원유로 오염된 토양으로부터 오염물질을 추출하는 연구를 수행하였다. 이와 함께 친유성 용매인 등유를 이용하여 토양으로부터 원유 일부를 탈착(전처리)시킨 후, 아임계수로 토양 내에 잔류되어 있는 유류성분을 제거하는 실험도 수행하였다. 이를 통해 아임계수 추출만을 적용하였을 경우와 등유 전처리가 추가된 경우의 제거율과 정화공정상 효율을 비교하였다. 아임계수 추출 시 275℃에서 2시간 추출을 5회 반복 진행하였을 때, 토양 내의 잔류 유류 농도가 498 mg/kg(제거율 97%)로 나타났다. 등유 전처리(토양 : 등유=1 : 0.5 wt%)후 아임계수 적용시 250℃에서 1시간동안 추출 시, 토양 내 잔류 유류 농도는 223 mg/kg로 나타났다. 적용된 두가지 공정 모두 토양1지역 우려기준(500mg/kg)이하로 정화되었으나, 상대적으로 등유전처리가 포함된 공정이 아임계수 기술만을 적용하여 추출을 진행한 것보다 상대적으로 높은 제거율을 보였다. 또한 등유 전처리가 추가된 아임계 공정이 추출시간, 공정수, 투입에너지(가열)에 있어 경제적으로 판단되며, 따라서 원유 오염토양의 아임계수 정화공정에서는 등유전처리 도입이 효과적인 것으로 판단된다.