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정밀분사 시스템을 이용한 초고속조형 제작방식의 삼차원 PCL 및 PLGA 인공지지체 제작
김종영 ( Jong Young Kim ),윤준진 ( Jun Jin Yoon ),박의균 ( Eui Kyun Park ),김신윤 ( Shin Yoon Kim ),조동우 ( Dong Woo Cho ) 한국조직공학·재생의학회 2008 조직공학과 재생의학 Vol.5 No.3
The aim of this study is to fabricate scaffolds from two types of biodegradable materials using a precision deposition system that we developed. The precision deposition system, which is one of rapid prototyping(RP) methods, uses technology that enables the manufacture of three-dimensional microstructures. Fabrication of 3D tissue engineering scaffolds using the precision deposition system required the combination of several technologies, including motion control, thermal control, pneumatic control, computer-aided design and computer-aided manufacturing( CAD/CAM) software. Through the fabrication and human bone marrow mesenchymal stem cells(hBMSCs) proliferation experiments of two kinds of scaffolds using poly(ε-caprolactone)(PCL) and poly(lactic-co-glycolic acid)(PLGA), feasibility of application to the tissue engineering of precision deposition system is demonstrated.
Effects of Medium Components on Phytase Production
Lee, Jae-Gwan,Seo, Moo-Youl,Yoon, Jun-Jin 中央大學校 食糧資源硏究所 1997 食糧資源硏究所 論文集 Vol.18 No.1
Nutritional conditions to optimize the production of microbial phytase were investigated. Various microbial strains including Aspergillus ficuum were compared from the standpoint of phytase production. Among them Asp. ficuum (NRRL3135) showed the highest level of phytase when grown on a starch-containing medium; however, in starch-free medium, the production decreased significantly. The addition of 1.0 mM of phosphate to starch-free medium enhanced the level of phytase production. Two kinds of nitrogen sources-nitrate and ammonium-were evaluated for the enzyme production by varying carbon source. Sodium nitrate and glucose as nitrogen and carbon sources, respectively, has been selected for optimal production of the enzyme. Also, the concentrations of NaNO₃ and glucose have been optimized at 8.6 and 30 g/l, respectively. Higher level of phosphate concentration inhibited the enzyme synthesis. Based on the results obtained, it is thought possible that phosphatecontrolled fermentation may yield a high phytase production.