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Development of an Artificial Tracheal Prosthesis: a Semicircular Shape Polyurethane Scaffold
HanSuKim,HwalSuh,JaHyunLee,JaeHyungKim,DongEunSong,InhoJo,SungMinChung,JaeYolLim,HaeSangPark,HyunJiKim 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.5
The purpose of this study is to develop an artificial prosthesis for reconstruction of a partial tracheal defect. Experimental animal study. A semicircular shape bi-layered (inner: porous, outer: dense) scaffold was made from polyurethane (PU). Polyethylene glycol was grafted onto the inner surface of the PU scaffold to act as a surfactant. Variable sized scaffolds (2×1, 2×2, 3×1, 3×2 and 3×3 cm2) were transplanted into ten beagles. Endoscopic and histological examinations were performed monthly (From 1 month to 6 month after transplantation). Scanning electron microscopy was performed to evaluate the ultrastructure. The measurement of trachea cilia beat frequency was carried out. The tensile strength was measured for evaluation the biomechanical property of the prosthesis. Seven out of the ten beagles survived to the expected date. The endoscopic examination showed granulation tissue on the scaffold transplanted site until one week after transplantation. The mucosa was completely covered after four weeks. The histological examination showed that a large amount of fibrous tissue had grown through pores of the porous scaffold. Ciliated respiratory mucosa was restored onto the surface of the PU scaffold, as visualized by scanning electron microscopy. About 16 -20 Hz cilia beat frequency was noted on the functional exam. The tensile stress (the stress strain curve) of the scaffold transplanted site was very similar with that of the normal cartilage. The semicircular shape PU scaffold could be used as a ready-made type prosthesis for tracheal reconstruction.
Biodiesel Production by Enzymatic Process Using Jatropha Oil and Waste Soybean Oil
Ja Hyun Lee,Sung Bong Kim,Hah Young Yoo,Young Joon Suh,Gyung Bo Kang,Woo In Jang,Jongwon Kang,박철환,김승욱 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4
In this study, non-edible Jatropha oil and postcooking waste soybean oil were utilized for enzymatic biodiesel production. The process was optimized by using a statistical method. In addition, a novel continuous process using co-immobilized Rhizopus oryzae and Candida rugosa lipases was developed. The optimum conditions for the batch process were determined to be a reaction temperature of 45oC, an agitation speed of 250 rpm, 10 wt% of water,and 20% of immobilized lipases. A conversion of about 98% at 4 h could be achieved for biodiesel production using Jatropha oil, while a conversion of about 97% at 4 h was achieved from waste soybean oil. A packed bed reactor charged with co-immobilized lipases was employed for continuous biodiesel production from Jatropha and waste soybean oil. The reactor consisted of a jacketed glass column (ID 25 mm × 130 mm), in which a temperature of 45oC was maintained by water circulation. A maximum conversion of about 80% in 24 h at a flow rate of 0.8 mL/min was achieved with the continuous process, whereas in the two-stage continuous process, a conversion of about 90% in 72 h was attained at a flow rate of 0.1 mL/min.