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급성 심근경색 : Gd-DTPA 조영증강 자기공명영상 Gd-DTPA Enhanced Magnetic Resonance Imaging
정경일,김제현,이창호,이영주,김한수,소동문,이영돈,박경주,왕희정,탁승제,이철주,김선용,김옥화,임태환,문창현,최병일,서정호 아주대학교 의과학연구소 1996 아주의학 Vol.1 No.1
This study was undertaken to determine the value of gadolinium dimeglumine (Gd-DTPA) enhanced MRI in the diagnosis of acute myocardial infarction. Seven cats were subjected to 2 hours of left anterior descending coronary arteryocclusion (group 1) and 8 cats to 1 hour of occlusion (group 2). Reperfusion was followed by taking Tl-weighted MR images at 5, 15, 30, 45, 60 minutes after Gd-DTPA (0.2 mmol/kg) injection. Myocardial enhancement patterns were categorized into three zones (central ischemic, peripheral ischemic, and normal) or two zones (ischemic and normal) and the presence of injured myocardium in each zone was confirmed by 2,3,5-triphenyltetrazolium chloride (TTC) staining. Signal intensity (SI) of each zone was evaluated relative to back muscle in regard to its chronological changes and difference among the zones. Group 1 displayed three zones of enhancement in 6 cats whereas 1 cat in group 1 and all in group 2 showed two zones of enhancement. Intermediate SI central zone was compatible but smaller than TTC nonstained area, and determined to be a persistently occlusive injury. High SI peripheral zone in group 1 and high SI ischemic zone in group 2 were stained and determined as reperfused injury although reversibility was not definite. The peak SI, occurring 15 minutes after Gd-DTPA injection, of 2.47±0.48 at peripheral zone was greater than that of 1.66±0.36 at central zone in group 1 and of 1.81±0.41 at ischemic zone in group 2 (p < 0.05). SI of injured myocardium increased more rapidly and decreased more gradually than that of normal myocardium. That the features of SI change with time in injured myocardium was compatible with the results of other studies using different contrast agents. Gd-DTPA enhanced MRI differentiated persistently occlusive injury as central intermediate SI, and reperfused injury as homogenous high SI, with the maximal contrast between the two at 15 minutes after contrast injection, thus indicating the value of Gd-DTPA enhanced MRI in the diagnosis of acute myocardial infarction.
메조기공의 실리카-티타니아 코겔의 제조와 자율적 조습 및 광촉매 특성
이상화,곽중협,서태수,김효중,김동표 한국공업화학회 2003 공업화학 Vol.14 No.3
수용액상의 졸겔반응에 의해 메조기공의 실리카-티타니아 코겔을 제조하고 이들의 자율적 조습력과 광촉매 특성에 대해 검토하였다. 실리카-티타니아 코겔에 있어 조습력과 관계되는 세공크기와 용적은 본 연구에서 고안된역적정법에 의해 Ph 7부근 및 SiO_2/TiO_2 비가 상대적으로 큰 9/1인 경우에 가장 큰 생성물이 얻어졌다. 폐놀 분해율에 의한 광촉매 특성은 동일조건에서 SiO_2/TiO_2 비가 감소함에 따라 증가하였고, SiO_2/TiO_2 비가 9/1에서 세공크기 4.0~6.0 nm 및 세공용적 0.6~0.8 mL/g 범위로 제어된 코겔의 경우 환경습도 40~70% 범위에서 흡습량 25%, 방습량 45%로서 종래 조습재료 보다 자율조습력이 큰 것을 볼 수 있었고, 같은 조성의 실리카-티타니아 혼합 산화물과의 폐놀 분해율에 의한 광촉매 특성 비교에서도 우수한 물성을 보이고 있었는데 이것은 Ti-O-Si 결합형성으로 인해 코겔 구조내에 음전하 과잉으로 인한 활성점(브렌스테드 산점) 발현에 기인된 것으로 고찰된다. Silica-titania cogel materials have been prepared by aqueous sol-gel process using a back titration technique designed for this study. The humidity self-control and photocatalytic properties of the materials have been also investigated. In these silica-titania cogel materials, relatively large pore size and pore volume than can give a good humidity control ability are desired, and they were synthesized under the reaction condition at pH of 7 and SiO_2/TiO_2 ratio of 9/1. The photocatalytic property, which was measured by the decomposition ratio of phenol, increased with the decrease of SiO_2/TiO_2 ratio in the composition. The cogel at the SiO_2/TiO_2 ratio of 9/1, resulted in the pore size of 4.0~6.0 nm and the pore volume of 0.6~0.8mL/g. At the relative humidity range of 40~70%, the amounts of moisture absorption and desorption were 25% 45%, respectively, and these had a better humidity control ability than conventional ones. In addition, the cogel showed a superior photocatalytic property compared to that of silica and titania mixture with the same composition. This enhancement is probably due to the revelation of active sites by the excess negative charges that were induced by Ti-O-Si bond formation in the cogel structure.
상치잎의 色素, 蛋白質含量 및 光系Ⅱ活性에 미치는 Sulfite와 산성 pH의 影響
權炳奎,鄭華淑,柳岑台 慶北大學校 師範大學 1986 敎育硏究誌 Vol.28 No.-
The present study was investigated to clarify the changes of pigments and soluable protein content, and PS Ⅱ activity of lettuce(Lactuca saliva L.) leaves induced by sulfite and acidic pH treatment. Lettuce leaves were treated with sodium sulfite at different concentrations, treatment time, and pH values. The leaf disks were illuminated at 20,000 lux and placed in darkness. Under the light condition pigments content, protein content and the rate of DCIP photoreduction were gradually reduced with the increase of sulfite concentration and treatment time below pH 5, but not in darkness. With treatment of 10mM sulfite for 3 hours at pH 7.0, pigments content were reduced by 21% in chlorophyll a, 17% in chlorophyll b, 14% in carotenoid, and protein content were also reduced by 47% in lettuce leaves. The rate of DCIP photoreduction were inhibited by 78% under the same conditions.
감의 脫澁處理中 Pectin 含量과 Texture의 變化
崔鍾旭,孫泰華,鄭信敎,李吉雨,姜峻洙 慶北大學校 1989 論文集 Vol.47 No.-
This experiment was made to investigate the changes of the contents of acetaldehyde, alcohol, tannin, and to study the texture changes of persimmon in relation to the contents of pection during the removal of astringency by CO_2. 1. During the removal of astringency of persimmon fruits, the contents of soluble tannin showed the rapid decrease in high concentration of CO_2, but the contents of ethanol and acetaldehyde showed the rapid increase in all treatments. 2. The contents of W.S.P. increased, but H.S.P. decreased in all treatments. 3. All texture paramenters of persimmon fruits except springness and adhesiveness were decreased druing the removal of astringency. 4. The contents of W.S.P. were good correlated with the changes of hardness in all treatments.
일 간호대학의 간호환경시스템 통합실습방안 적용 : 간호관리학과 지역사회간호학의 통합
김광숙,이경자,김의숙,이정렬,김인숙,이태화,조윤희,정제인,이현정,배선형,김은현 대한간호학회 간호행정학회 2008 간호행정학회지 Vol.14 No.1
Purpose: Integrated curriculum has been considered as a desirable method in health related school course. The present study was conducted to develop practice curriculum which integrates nursing management and community health nursing and measure the education effect. Method: Literature review and scores of professional meeting were carried out to generate main educational goals, contents, operating principle, and evaluation item. Student evaluation was done by survey and in-dept interview in right after practicum and three months respectively. Results: Six concepts were derived as main component of the integrated curriculum. From 2 to 3 sub-categories were matched to each main component as well. Subsequently, practice contents were suggested on the basis of sub-categories. Attainment of practicum goal scores ranged from 2.82 to 3.54 in four points index. Students expressed that they found nursing manager's role in the community setting. Conclusion: This new approach encouraged students to ascertain relationship between hospital oriented and community based practice. Additionally, they can be prepared to comprehend diverse health care environment.