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이지현 ( Ji Hyun Lee ),유대현 ( Dae Hyun Yoo ),정윤호 ( Yoon Ho Chung ),엄완식 ( Wan Sik Uhm ),김태환 ( Tae Hwan Kim ),전재범 ( Jae Bum Jun ),정성수 ( Sung Soo Jung ),이인홍 ( In Hong Lee ),배상철 ( Sang Cheol Bae ),김인순 ( In So 대한류마티스학회 2000 대한류마티스학회지 Vol.7 No.3
The myelodysplastic syndrome (MDS) is a heterogeneous group of refractory anemia resulting from a clonal abnormality in the pleuripotent stem cell. A variety of immunologic abnormalities have been reported in patients with MDS, and various rheumatic diseases, including rheumatoid arthritis, lupus, Sjogren`s syndrome, vasculitis, have been reported in association with MDS. Inflammatory arthritis is a rare complication of MDS. Here we report a patient with refractory anemia with excess blasts with unusual manifestation of inflammatory arthritis, with a review of the literature.
Uhm, Sang Ho,Moon, Joo Noh,Lee, Chang Hee,Yoon, Ji Hyun,Lee, Bong Sang Trans Tech Publications, Ltd. 2005 Materials science forum Vol.475 No.-
<P>As a part of a study on modeling the microstructural evolution during the welding process, a prediction model of TTT diagram for bainite transformation was studied. This model consisted of a thermodynamic model for the bainite-start(Bs) temperature and a kinetic model for the bainite transformation. A kinetic model was empirically established for low alloy carbon steels, based on Johnson-Mehl-Avrami(JMA) equation. Reaction constants seemed not to have noticeable tendencies for temperatures and were averaged for each alloy. It was, however, found that the mean reaction constant significantly affected the reproducibility for the isothermal kinetics. Therefore, a calibration method to the kinetic parameter was proposed. From calibrations, rate constants were formulated as a function of alloying element and temperature. And TTT diagrams were calculated and compared with experiments.</P>
Ji Young Park,Jiyou Han,Soo Jin Uhm,Jong Hyun Kim,Jeong Sang Son,Yu Jin Jang,Jae Hun Lee,Gyunggyu Lee,Jong Hoon Kim,Jong Seung Kim 한국발생생물학회 2015 한국발생생물학회 학술발표대회 Vol.2015 No.9
Hepatocytes and hepatic progenitors derived from human ES cells may be a useful source for clinical application. Therefore, identification and purification of these cell types would be following important issues. There are very few candidate surface markers that can be used to identify and purify hepatic progenitor cells. In addition, indocyanine-green can be uptaken by mature hepatocytes, but cannot be applied for fluorescence activated cell sorting (FACS) due to its long emission wavelength. In the present study, we tested EpCAM as a potential marker for magnetic-activated cell sorting (MACS) of hepatic progenitors and also modified indocyanine-green into fluorescent indomonocarbocyanine for FACS-mediated sorting of mature hepatocytes after differentiation of human ES cells. Hepatic progenitor cells were sorted by MACS after incubation with anti-human EpCAM antibodies. After the final differentiation, the differentiated cells and mouse primary hepatocytes (control group) were incubated with indomonocarbocyanine and were sorted by FACS. MACS and immunocytochemistry data showed that approximately 45% of differentiated cells were EpCAM-positive cells. EpCAM-positive cells expressed α-fetoprotein, FOXa2, HnF4a, and CK18. Differentiation efficiency into albumin-positive cells was significantly higher in EpCAM-positive cells, compared to EpCAM-negative cells. Importantly, indomonocarbocyanine successfully stained cells that expressed ALB. Furthermore, FACS analysis data showed that the purity of hepatocytes that expressed albumin was significantly increased after purification of indomonocarbocyanine-positive cells. Our data demonstrated that human ES cell-derived hepatic progenitors can be efficiently isolated by MACS using EpCAM antibody. In addition, we also showed that indomonocarbocyanine can be successfully used to identify and purify mature hepatocytes using FACS.
Fe–Nx active sites in Fe–N–C electrocatalysts synthesized using electron beam irradiation
Uhm Young Rang,Sun Gwang Min,Lee Jaegi,Kim Chul Sung,Park Ji Hyun,Ha Taesung 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.3
Fe–N–C catalysts synthesized by the electron beam (e-beam) irradiation pyrolysis of Fe and N precursors is studied owing to their remarkable activities in the electrochemical oxygen reduction reaction (ORR). The conditions for Fe–Nx formation were confrmed by irradiation at 80 kGy under an e-beam energy of 10 MeV and a beam current of 800 μA. The coordination between Fe and each phenanthroline (phen) isomer (1,7-phen, and 1,10-phen) was efectively controlled by molecular structures of monodentate, and bidentate. The pyridinic N % was found to be 70.1% for Fe (1,10-phenanthroline)/KB prepared by e-beam irradiation pyrolysis. This catalyst exhibited superior ORR activity and stability in alkaline half-cells. The use of precursors with bidentate coordination is important to obtain the efective inducement of Fe–Nx active sites for electrocatalysts during ORR.