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Pectin 의 첨가수준과 지방의 종류를 달리하였을 때 흰쥐의 체내 콜레스테롤 함량에 미치는 영향
이재준,한인규 ( J . J . Lee,I . K . Han ) 한국축산학회 1985 한국축산학회지 Vol.27 No.11
The present study was performed to investigate the effect of three different levels of pectin (0.5, 5, 10%) and two different ratios of polyunsaturated to saturated fatty acid (P/S) on lipid metabolism in rats. Three levels of pectin were incoporated into purified diets with either 5% corn oil or butter as the lipid source. Weanling male rats were fed these diets for 4 weeks. The contents of total lipids and total cholesterols in serum tended to increase with decreasing P/S ratio of dietary fat and pectin levels. There was a decreasing trend in the levels of total liver lipid with increasing P/S ratio of dietary fat and pectin levels. Cholesterol contents of the liver were significantly higher in low pectin groups than the others but were increased with increasing PUFA level of dietary fat. There was a decreasing trend in the levels of total kidney cholesterol and lipid with increasing P/S ratio of dietary fat and pectin levels.
RF 마그네트론 스퍼터링법에 의한 a-축 배향 $YBa_2Cu_3O_{7-\delta}$박막의 제조
이재준,김영환,신진,이경희,최상삼,한택상,Lee, J.J.,Kim, Y.H.,Shin, J.,Lee, K.H.,Choi, S.S.,Hahn, T.S. 한국재료학회 1994 한국재료학회지 Vol.4 No.4
a-측으로 배향된 $YBa_2Cu_3O_{7-\delta}$ 고온 초전도 박막을 $LaAIO_{3}$(100)단결정 기판에 이중 타게트 off-axis rf마그네트론 스퍼터링법으로 증착하였다. 박막은 기판온도(Ts)$590^{\circ}C$와 $680^{\circ}C$사이에서 단일공정으로 증착하는 one-step방법과, $590^{\circ}C$의 저온에서 a-축으로 배향된 YBCO박막(두께-30nm)을 면저 만들어 틀로 작용시킨 후 그 틀위에 나머지 부분을 기판온도를 승온하면서 증착하는 방법인 two-step방법 등 두 가지 방법을 사용하여 증착시켰다. one-step방법에서는 $T_s$가 증가함에 따라 감소하였으며, ($00 \ell$)피크는 증가하였다. Two-step방법으로 증착한 박막은 증착속도가 감소함에 따라 (h00)피크가 우세하게 나타났다. 박막의 미세구조는 a-축, c- 축 배향성이 혼재하여 핀홀과 같은 결함들이 생성되었다. 모든 경우 $T_s$가 감소함에 따라 a-축 배향성은 우세하였으나 전기적 특성은 저하되었고, 긴 전이온도 폭을 가졌다. A-axis oriened YBCO thin flims were grown on $LaAIO_{3}$ single crystal substrate by off-axis rf magnetron sputtering method. We used two kinds of process to get a-axis oriented fi1ms;one-step process and two-step process. In one-step process, films are grown in single step in which substrate temperature( $T_s$) is in the range of $590^{\circ}C$ to $680^{\circ}C$. On the other hand, in two step process a-axis oriented thin film templates i f about 30nm thickness is deposited at low temperature first, and subsequently films are grown at elevated temperature to the final thickness of about 100nm. In the case of one step process($T_s$ ~)$600^{\circ}C$), prefered a-axis orientation is dominant and Cu-rich phases segregate at the surface. Segregations decrease and ($00 \ell$) peaks increase upon increasing $T_s$. The films prepared by two step method appeared to have strong(h00) peaks as the deposition rate increased. Microstructure shows pin holes resulted from mixed phases of a-axis and c-axis oriented films. In both cases of one step and two step process, as TS decreases, prepared films show stronger a-axis orientation. However electrical properties of the films are depressed with lower $T_c$ and wider $\Delta T$ as $T_s$ decreases.