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최효경,구동억,방선우,이문규,조경식,오용호 울산대학교 의과대학 1993 울산의대학술지 Vol.2 No.2
It may be difficult to differentiate renal cell carcinoma involving collecting system from renal pelvis urothelial tumor invading into renal parenchyma. The purpose of this study was to find out CT differential points of two diseases. 15 cases suggested invasion into other compartment in CT images were selected and evaluated about the presence or absence of hydronephrosis, CT renal function, renal contour changes due to mass and tentative diagnosis. Renal cell carcinoma was characterized by no hydronephrosis(80%), normal CT renal function (100%) and outward bulging mass(100%). However, renal pelvis urothelial tumor showed hydronephrosis(70%), abnormal CT renal function(60%) and preserved reniform shape(100%). In conclusion, renal contour changes and CT renal function are reliable criteria in differentiating two diseases.
집토끼 동방결절의 활동전압에 미치는 Vanadate의 효과
조용문,방효원,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1984 中央醫大誌 Vol.9 No.3
In order to investigate the electrphysiological effect of vanadate, a potent inhibitor of Na^+-K^+ pump, on the cardiac muscle, the alteration of transmembrane potential as influenced by the drug was measured in rabbit SA rodes in vitro by means of KCI glass intracellular microelectrodes. The followings were results of findings: 1. The rate of spontaneous firing was decreased in the presence of vanadate and the maximum inhibition which was about 50% of contral level was obtained at drug concentrations of 10^-3 M or higher. 2. The maximum diastolic potential(M.D.P.) was depressed by vanadate in a dose-dependent manner and the maximum inhibitory effect was obtained at the drug concentration of 10^-3 M. However the peripheral pacemaker cells were more resistant to the drug effect than the central pacemaker cells at lower concentrations of the drug. 3. In both central and perepheral pacemaker cells, vanadate had no effect on the M.D.P. in concentrations up to 5×10^-4 M. However on at 5×10^-2 M, the drug depressed the M.D.P. in the peripheral cells. 4. Changes of the action potential induced by vanadate were qualitatively similar to those occuring when the calcium concentration of the bathing medium was raised to 4mM. These results may be interpreted as that vanadate increases the rate of Ca^++ influx info the cell in S-A nodes.
마산만의 하수기인 유기물 fecal sterol의 분포
최민규,문효방,김상수,이윤 한국환경과학회 2005 한국환경과학회지 Vol.14 No.5
Surface sediments and seawater were sampled at Masan and Haengam Bays of Korea, to evaluate contamination by sewage-derived organic matter using fecal sterols. Six stream-water samples into Masan and Haengam Bays were also sampled. Total concentrations of eight sterols (coprostanol, epichloestanol, epicoprostanol, cholesterol, cholestanol, brassicasterol, stigmasterol and β-sitosterol) were in the range of 1,274~4,768 ㎍/g dry weight in suspended particulate from the stream-water, 292-2,244 ㎍/g dry weight in suspended particulate from the seawater and 4.5~27.2 ㎍/g dry weight in the sediments. Although sterol compositions in sediments, seawater and stream-water were different, cholesterol was the predominant sterol in all samples. The proportion and concentration of coprostanol, a sewage tracer, in stream-water was much higher than those in sediment and seawater. The sterol levels including coprostanol in the sediments and seawater were higher at inner basin than at the outer bay. Some molecular indices and multivariate statistical analysis were used to assess the origin of these sterols and sewage contamination in the study area. The sterol composition patterns in stream-water were mainly associated with contamination by sewage-derived organic matters and those of seawater were associated with the activities of marine-originated organisms. Sterol levels in the sediments were both from the sewage input through stream-water and the marine-originated organisms. This survey suggests that the main source/route of sewage-derived organic matters in Masan Bay is the input of stream-water into the bay.
이호준,양효식,전영문,정흥락,강재구,방제용 建國大學校基礎科學硏究所 1996 理學論集 Vol.21 No.-
영광원자력발전소 주변의 식생에 대한 식물사회학적 조사를 실시하였으며, 순 1차 생산량과 식물현존량을 추정하였다. 또한 상관에 의해 현존식생도 및 녹지자연도를 작성하였다(1:50,000). Z-M 방식에 의한 삼림식생은 소나무군락과 곰솔군락으로 구분되었다. 전체적으로 교목층에 소나무와 곰솔, 아교목층에 졸참나무와 곰솔, 관목층에 털진달래와 신갈나무, 초본층에 털대사초와 그늘사초 등의 피복지수가 우세하게 나타났다. 토양의 pH는 4.65∼4.67, 유기물 함량은 7.28∼7.53%의 범위였다. 현존식생도에 의한 분포비율은 경작지(67%), 소나무(21.9%) 및 곰솔군락(9.1%)의 순으로 나타났으며, 녹지자연도는 등급 2가 67%(경작지), 7등급(이차림(A))과 6등급(조림지)이 각각 29.2%와 1.8%로 나타났다. Montreal model에의한 소나무림과 곰솔림의 식물현존량은 657,817.2와 177,367.0ton으로 각각 산정되었다. The forest vegetation and estimation of phytomass and net primary production in the vicinity of Yonggwang Atomic Power Plant were analyzed on the basis of the phytosociological data. Depending on physiognomy, the actual vegetation map and the degree of green naturality(DGN) were also drawn in the scale of 1:50,000. According to Z-M method, the forest vegetation was classified into two communities; Pinus densiflora and Pinus thunbergii communities. It was generally shown that Pinus densiflora and Pirus thunbergii in tree-1 layer, Quercus serrata and Pinus thunbergii in tree-2 layer, Rhododendron mucronulatum var. ciliatum and Quercus serrata in shrub layer, and Carex ciliato-marginata and Carex lanceolata in herb layer had high coverage index. The pHs and contents of organic matter of the forest soils collected in each sites were in the 4.64 to 4.67 and 7.28% to 7.53% in average, respectively. The distribution area of each vegetationindex. The pHs and contents of organic matter of the forest soils collected in each sites were in the 4.64 to 4.67 and 7.28% to 7.53% in average, respectively. The distribution area of each vegetation type in the actual vegetation map was 67% cultivated land, 21.9% in Pinus densiflora community and 9.1% in pinus thunbergii community. The distribution of the degree of green naturality(DGN) was 67% in the second-grade (cultivated land), 29.2% in 7th grade (second forest(A)) and 1.8% in 6th grade (plantation). It was estimated that phytomass of Pinus densiflora and Pinus thunbergii in the study sites, which was calculated by Montreal model, was 657,817.2 and 177,367.0 ton, respectively.
Fecal sterol을 이용한 울산만과 주변해역 퇴적물내 하수기인 유기물 평가
최민규,최희구,김상수,문효방 한국환경과학회 2005 한국환경과학회지 Vol.14 No.1
Surface sediments (0~4 cm) were sampled at 40 stations from Ulsan Bay and its adjacent areas of Korea, to evaluate the contamination by sewage-derived organic matters using fecal sterols. Some sterols were quantified by gas chromatography coupled to mass spectrometry (GC/MS). Total concentrations of eight sterols (coprostanol, cholesterol. cholestanol, epicholestanol, epicoprostanol, (3-sitosterol, brassicasterol, and stigmasterol) in the sediments from Ulsan Bay and its vicinity varied from 929 to 23.444 ng/g dry weight. The most predominant sterols were cholesterol and coprostanol, accounting for 33~72% of total sterols. The concentration of coprostanol known as the indicator of human feces ranged from 141 to 8,257 ng/g dry weight. In particular, the coprostanol concentrations in the sediments from Jansaengpo Harbor and Taehwa River exceeded the value of 1,000 ng/g dry weight. suggesting that these areas could be considered as the hot-spot zones by municipal sewage contamination. Some molecular indices and multivariate data analysis were used to assess the origin of these sterols in the sediments. Results showed that the major routes of sewage contamination in Ulsan Bay and its vicinity were the input through Jansaengpo Harbor and Taehwa River.
Moon, Hyo-Bang,Kang, Sung-Kyung,Seo, Won-Ju,Choi, Min-Kyu,Yu, Jun,Choi, Hee-Gu,Park, Jong-Soo The Korean Society of Fisheries and Aquatic Scienc 2007 Fisheries and Aquatic Sciences Vol.10 No.2
Concentrations of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) were determined in marine sediments from Mokpo coastal water of Korea. Total and toxic equivalent (TEQ) concentrations of PCDD/Fs ranged from 19.4 to 175pg/g dry weight and ranged from 0.195 to 2.87 pg WHO-TEQ/g dry weight, respectively. These PCDD/F concentrations were below the safety sediment value (20 pg TEQ/g dry weight) of chronic toxicity. A highly significant correlation between the concentrations of PCDD/Fs and total organic carbon (TOC) in marine sediments was observed. Overall PCDD/F concentrations in the sediments were elevated in rivers and at inner locations close to harbors, indicating that these contaminants derived from local discharges of human activities. PCDD/F concentrations measured in our study were lower than those in several industrialized areas in Korea. Nonparametric multidimensional scaling (MDS) ordination showed that combustion processes from industrial complexes are the major source of PCDD/Fs in Mokpo coastal water.