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황경국(Kyung Kuk Hwang),김효수(Hyo Soo Kim),서정욱(Jung Uk Seo),채인호(In Ho Chae),손대원(Dae Won Sohn),오병희(Byung Hee Oh),이명묵(Myoung Mook Lee),박영배(Young Bae Park),최윤식(Yun Shik Choi),서정돈(Jung Don Seo),이영우(Young Woo L 대한내과학회 1998 대한내과학회지 Vol.55 No.6
N/A Background: The mechanism of the closure of umbilical vessels is known to be multifactorial. In order to verify that apoptosis is one of the possible closure mechanisms, we studied to identify apoptosis in umbilical vessels and evaluate its mechanism by studying apoptosis-related gene and the relationship between the pattern of apoptosis and gestational age (GA). Methods: Twelve umbilical cords of GA of 37-42 weeks were obtained immediatly (less than 10 min. for minimal ongoing external influences) after birth. The presence of apoptotic cells was demonstrated by electron microscopy (EM) and terminal deoxynucleotidyl transferasemediated dUTP nick end labeling (TUNEL). Immnohistochemical staining and Western blotting were used for the analysis of the proteins of apoptosis-related gene. Results: Apoptosis of the smooth muscle cells of media and intima of umbilical vessels was identified at EM, regardless of GA from 37 to 42 weeks. The proportion of TUNEL(+) cells was 80% in intima, 40% in media, 80% in connective tissue of umbilical cord. The expressions of bax-a, bcl-Xs/L were strong in intima, in media and connective tissue, but those of bcl-2 were detected in only in connective tissue, regardless of GA in immunohistochemistry. The ratios of expressions of bax- a to bc1-2, bcl-Xs to bcl-XL, did not change with increasing GA from 37 to 42 weeks in Western blot- ting. Conclusion: Apoptosis was identified in umbilical vessels. The closure of umbilical vessels can be explained by apoptosis where the ratios of bax-a/bcl-2, bcl-Xs/ bcl-XL play an important role. The fact that there were no differences in the extent of apoptosis and the expressions of bax-a/bcl-2, bcl-Xs/bcl-XL according to GA, suggests that apoptosis of umbilical vessels is more dependent on the external stimuli during delivery than GA.
용액연소법으로 제조된 광촉매용 ZnO 나노분말을 이용한 도금 폐용액 에서의 금 수거
박성,서정욱 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-
In this study, ZnO nanopowders were synthesized by solution-combustion method (SCM). The photocatalytic gold recovery efficiency by this SCM ZnO nanopowder was about 6 fold higher compared to the case by the state of the art commercial TiO₂ nanopowder. The purity of recovered gold was about 99.6% in weight% and 98.8% in atomic%. Furthermore, the ZnO nanopowder synthesizing method and gold recovery process are very cost-effective. Especially, in this study it was tried to recover gold metal ions from not simulated wastewater but real plating wastewater. This technology is therefore very viable to obtain high purity gold from plating wastewater. Photocatalytic reaction using SCM ZnO nanopowders could be very valuable technology in view of following two applications. Firstly, expensive noble metals such as silver and gold could be economically recovered using this technology. Secondary, it could be used to remove toxic heavy metal ions from wastewater for environmental purpose.