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황상미,Cha-ja See,최정은,김선영,김정아,최규태,권지석,박시내,임경옥,오일환,이동순 생화학분자생물학회 2013 Experimental and molecular medicine Vol.45 No.12
The cytogenetic analysis of mesenchymal stromal cells (MSCs) is essential for verifying the safety and stability of MSCs. An in situ technique, which uses cells grown on coverslips for karyotyping and minimizes cell manipulation, is the standard protocol for the chromosome analysis of amniotic fluids. Therefore, we applied the in situ karyotyping technique in MSCs and compared the quality of metaphases and karyotyping results with classical G-banding and chromosomal abnormalities with fluorescence in situ hybridization (FISH). Human adipose- and umbilical cord-derived MSC cell lines (American Type Culture Collection PCS-500-011, PCS-500-010) were used for evaluation. The quality of metaphases was assessed by analyzing the chromosome numbers in each metaphase, the overlaps of chromosomes and the mean length of chromosome 1. FISH was performed in the interphase nuclei of MSCs for 6q, 7q and 17q abnormalities and for the enumeration of chromosomes via oligo-FISH in adipose-derived MSCs. The number of chromosomes in each metaphase was more variable in classical G-banding. The overlap of chromosomes and the mean length of chromosome 1 as observed via in situ karyotyping were comparable to those of classical G-banding (P¼0.218 and 0.674, respectively). Classical G-banding and in situ karyotyping by two personnel showed normal karyotypes for both cell lines in five passages. No numerical or structural chromosomal abnormalities were found by the interphase-FISH. In situ karyotyping showed equivalent karyotype results, and the quality of the metaphases was not inferior to classical G-banding. Thus, in situ karyotyping with minimized cell manipulation and the use of less cells would be useful for karyotyping MSCs.
Nanosheet 구조를 기반으로 한 Monolayer 2D FET 전기적 특성 비교
장태영(Taeyoung Jang),김진호(Jinho Kim),송주찬(Joochan Song),권지석(Jiseok Kwon) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Graphene 등장 이후 다음 세대 물질로 TMDC-(Transition metal dichalcogenides) 물질이 소개되었다. TMDC는 우수한 전기적 특성으로 인해 연구자들에게 매력적으로 다가가고 있다. 그래서 본 연구에서는 TMDC 기반의 Nanosheet Field-Effect Transistor (FET) 를 중점적으로 고려했다. 우리는 다섯 가지 서로 다른 채널물질을 사용하여 Nanosheet FET의 성능 잠재력을 평가했다. 이런 방식으로 각각의 채널 물질이 Nanosheet FET의 전기적 특성에 어떻게 영향을 미치는지를 규명하려 한다. 본 연구를 위해 Purdue University에서 개발한 nanoHUB 에 속해 있는 Nanosheet FET Simulation tool 사용하여 분석했다[1]. 수행한 실험 결과에 따르면, on/off ratio를 기준으로 WS2 기반의 Nanosheet FET이 가장 우수한 성능을 보여준다.