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김기중 ( Ki Jung Kim ),유형덕 ( Hyung Duk Yoo ),김용희 ( Yong Hee Kim ),이용안 ( Yong An Lee ),김방진 ( Bang Jin Kim ),정미선 ( Mi Seon Jung ),강현구 ( Hyun Gu Kang ),이장희 ( Jang Hee Lee ),류범용 ( Buom Yong Ryu ) 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.1s
The annual regrowth of deer antlers is a connatural developmental event in mammals. Therefore, studying regeneration of deer antlers could be a unique natural model of rapid and complete bone regeneration in human and other mammals. However, little is known about culture conditions and regulatory factors that stimulate growing of deer antler cells in vitro. The aim of this study was to enhance an in vitro culture efficiency of mesenchymal stem cells (MSCs) derived from deer antlers. In order to improve the culture condition, we selected minimal essential medium alpha (MEMα) as a basal medium and investigate whether serum could stimulate growing in these cells in basal medium in a dose-dependent manner. Next, to investigate the optimal temperature and O2 tension, the antler cells were cultured in different temperature and controlled O2 percentages. Through the results of number of harvested cells after 1 week, we selected MEMα, 10% fetal bovine serum (FBS), 37oC, 20% O2, and 5% CO2 tension as a basic culture conditions. Also, we could observed enhanced proliferation results by addition of the supplements [L-glutamine 2 mM, β- mercaptoethanol 100 μM, non-essential amino acid (NEAA) 0.1 mM, and HEPES 10 mM] and growth factors [basic fibroblast growth factor (bFGF) 10 ng/mL, epidermal growth factor (EGF) 20 ng/mL, insulin-like growth factor-1 (IGF-1) 10 ng/mL] and harvested antler cells strongly expressed STRO-1 and CD 90. Our results demonstrate that allow continuous proliferation of antler cells in vitro established the foundation to basic biology of antler cells and makes possible application to the regenerative medicine in a broad sence.
GE AdvanceTM 양전자방출단층촬영기의 표준 성능평가
정하규(Ha Kyu Jeong),김희중(Hee Joung Kim),손혜경(Hye Kyung Son),봉정균(Jung Kyun Bong),정해조(Hai Jo Jung),전태주(Tae Joo Jeon),김재삼(Jae Sam Kim),이종두(Jong Doo Lee),유형식(Hyung Sik Yoo) 대한핵의학회 2001 핵의학 분자영상 Vol.35 No.2
N/A Purpose: The purpose of this study was to establish optimal imaging acquisition conditions for the GE AdvanceTM PET imaging system by performing the acceptance tests designed by National Electrical Manufacturers Association (NEMA) protocol and General Electric Medical Systems (GEMS) test procedures. Materials and Methods: Performance tests were carried out with 18FDG radioactivity source and phantoms by using a standard acquisition mode. Transaxial resolution and scatter fraction tests were performed with a line source and axial resolution with a point source, respectively. A cylindrical phantom made of polymethylmethacrylate (PMMA) was used to measure sensitivity, count rate losses and randoms, uniformity correction, and attenuation inserts were added to measure remaining tests. The test results were acquired in a diagnostic acquisition mode and analyzed mainly on high sensitivity mode. Results: Transaxial resolution and axial resolution were measured as average of 4.65 mm and 3.98 mm at 0 cm, and 6.02 mm and 6.71 mm at 20 cm on high sensitivity mode, respectively. Average scatter fraction was 9.87%, and sensitivity was 225.8 kcps/ Ci/cc of trues. Activity at 50% deadtime was 4.6 Ci/cc, and the error of count rate correction at that activity was from 1.49% to 3.83%. Average nonuniformity for total slice was 8.37%. The accuracy of scatter correction was -0.95%. The accuracies of attenuation correction were 5.68% for air, 0.04% for water and -6.51% for polytetrafluoroethylene (PTFE). Conclusion: The results satisfied most acceptance criteria, indicating that the GE AdvanceTM PET system can be optimally used for clinical applications. (Korean J Nucl Med 2001;35:100-112)