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노성혁,조인성 慶熙大學校 地球環境硏究所 2002 지구환경논문집 Vol.13 No.-
본 연구에서는 수원지역 지하수질 개선과 효율적인 관리를 위해 대상 지역의 지하수의 수질을 조사하여 오염실태를 조사하였다. 조사결과 음용수로 사용하는 17개 지점의 경우 전 항목이 기준치 미만으로 측정되었으며, 생활용수로 사용되는 258개 지점에서는 5개 항목만이 검출되었고, 나머지 중금속 등 10개 항목은 검출되지 않은 것으로 조사되었으며, pH의 경우 팔달구의 1개 지점에서 9.8로 기준치를 초과하였으며, 질산성 질소의 경우 장안구의 2개 지점에서 27.9, 34 ㎎/L로 기준치인 20 ㎎/L를 초과한 것으로 조사되었다. 이러한 연구를 통해 지표수자료, 기상자료, 지하수 사용량 및 수질자료 등을 특정한 시간에 따라 자료를 수집하여 전산화함으로써 효율적인 지하수가 이루어져야 한다고 생각한다.
가토의 외상성 슬관절염의 자연적 치유 경과에 대한 고찰
김동헌,장병춘,김상윤,김동혁 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-
Articular cartilage is a highly differentiated tissue, lacking a vascular supply and having only limited regenerative capability. It has been well documented that articular cartilage of mature animals has little capacity for repair after traumatic injury. Cuts or other mechanical damage restricted to the cartilage alone do not repair. However, it has been observed both experimentally and clinically that articular defects extending to the subchondral bone eventually are resurfaced with a form of fibrous, fibrocartilagenous or hyaline like cartilagenous tissue. Author's study was designed to evaluate the healing process of osteochondral defect of the knee of rabbit. Partial thickness defect of cartilge and full thickness osteochondral defect of 30 rabbits were made with 3mm diameter of drill-bit. Experimental animals were divided into three groups : 1) Group Ⅰ: Control group 2) Group Ⅱ: Partical cartilage defect group 3) Group Ⅲ: Osteochondral defect group The healing of the defect was assessed at 1weeks, 3weeks, 5weeks, 12weeks after operation by gross and histological examination. The principal findings were as follows. 1. The initial formation of repair tissue was variable, but it ocurred in most cases. 2. In partial cartilage defect group, degenerative change was more severe. 3. There is evidence of healing of small (1-4 mm diameter) but not of large full thickness articular defect. 4. Microscopically, resurfacing of the cartilage holes repaired mainly with fibrocartilage at 5 weeks of injury.
Chromium Methionine Supplementation Decreases Obesity Indices in Rats
Sang Jip Ohh,Chang Hyeuk Kim,Jong Seo Shin,Kyung Il Sung,Hyun Sook Kim 한국식품영양과학회 2003 Preventive Nutrition and Food Science Vol.8 No.3
This study was conducted to determine the effects of chromium-methionine (CrMet) supplementation at various levels on obesity index, body fat, and serum glucose, insulin and leptin in rats. Forty male Sprague-Dawley rats were randomly assigned to one of four dietary groups and fed AIN-76 semi-purified basal diets supplemented with 0, 300, 600 or 1200 ppb Cr from CrMet. After 4 weeks on the respective diets, the rats were killed and serum glucose, insulin and leptin concentrations were determined. The CrMet supplementation did not affect weight gain, feed intake or feed efficiency ratio, fasting glucose, insulin or leptin levels among treatment groups. Although final body weight in all treatments were not significantly different, naso-anal length was longer in the 1200 ppb CrMet group than those of control or other groups (p<0.05). The lowest obesity index and body fat were observed in the 1200 ppb dietary group (p<0.05). The obesity index of the rats fed 1200 ppb supplemental CrMet was lower than in the other groups. These results suggest that CrMet supplementation results in a significant decrease in obesity index, possibly by decreasing the body fat that corresponded to increasing CrMet dosage.
Effects of Different Forms of Chromium Supplements on Serum Glucose, Insulin and Lipids in Rats
Sang Jip Ohh,Chang Hyeuk Kim,Jong Seo Shin,Kyung Il Sung,Hyun Sook Kim 한국식품영양과학회 2004 Preventive Nutrition and Food Science Vol.9 No.4
This study evaluated the effects of different forms of chromium supplements on serum glucose, insulin and lipid concentrations in rats. Sprague-Dawley male rats were randomly assigned to one of three dietary groups and fed AIN-76 semi-purified basal diets supplemented with 300 ppb Cr from Cr methionine (CrMet) and Cr chloride (CrCl₃) or without Cr (control). By the end of the 4^(th) week, all rats were decapitated, blood collected, and serum glucose, insulin and lipid concentrations were determined. The CrMet and CrCl₃ supplementation did not affect weight gain and feed efficiency ratio. However, feed intake was significantly higher in CrMet groups than control (p<0.05). CrMet-supplemented rats had markedly increased insulin levels (p<0.05) compared with controls. Serum lipids were not significantly different between the control and the CrMet groups. CrCl₃ supplementation decreased total cholesterol and triglyceride, but the decreases were only significant for the control group. CrCl₃ supplementation was associated with significant decreases in total cholesterol compared with CrMet supplementation. These results indicate that CrMet supplementation is effective for increasing serum insulin, and CrCl₃ may improve lipid concentrations, because we observed decreased serum total cholesterol and an improved total cholesterol/HDL-cholesterol ratio (THR).
Hyeuk Woong Kwon,Joo Hee Han,Yong Kang,Sang Done Kim 한국화학공학회 1994 NICE Vol.12 No.5
N/A The effects of gas(0.02∼0.1 m/s) and liquid velocities (0.0∼0.10 m/s) on the bubble properties and pressure fluctuations have been determined in a 0.376 m-ID X 2.1 m-high bubble column. The pressure fluctuation have been analyzed by resorting to the Fractal analysis the time series of pressure fluctuation signals have been analyzed by means of the Resealed range analysis and the Hurst exponent has been obtained. The bubble chord length and its rising velocity increase but the Hurst exponent decreases with increasing gas velocity. Whereas, the bubble chord. length decreases, but the Hurst exponent increases with an increase in liquid velocity in the continuous bubble column(U_L$gt;0.02m/s). The Hurst exponent has been found to have a definite relationship with the bubble chord length and its standard deviation.