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Development of a wash-free immunoassay using Escherichia coli cells with autodisplayed Z-domains
Pyun, Jae-Chul,Jose, Joachim,Park, Min Royal Society of Chemistry 2017 The Analyst Vol.142 No.10
<P><I>Escherichia coli</I> cells that autodisplay Z-domains have been used to improve the sensitivity and limit of detection (LOD) of immunoassays by controlling antibody orientation. In this study, a rapid, wash-free immunoassay was developed using <I>E. coli</I> cells with autodisplayed Z-domains and flow cytometry. The fluorescence signal from a single <I>E. coli</I> cell could be identified and background noise from non-bound detection antibodies was minimal. Flow cytometric measurement was demonstrated to be more effective than microscopy or fluorescence photometry. The concentrations of the capture and detection antibodies were optimized by testing various concentrations; the incubation time was optimized in the same way. The wash-free immunoassay was used to quantify the C-reactive protein (CRP) and the results were compared with those of an established assay method. The results of the wash-free immunoassay were significantly correlated with the results of the washing method, but showed an improved LOD and dynamic range. Thus, the wash-free immunoassay based on <I>E. coli</I> cells with autodisplayed Z-domains and flow cytometry developed here was confirmed to be feasible for use in medical diagnosis.</P>
Pyun, Haeuk,Kim, Dae-Chul,Kim, Yonghyun,Choi, Young-Rock,Park, Yeunsoo,Song, Mi-Young,Kim, Young-Woo,Yoon, Jung-Sik,You, Shin-Jae,Cho, Hyuck,Buckman, S J,Sullivan, J P Institute of Physics Publishing Ltd. 2019 Journal of Physics B: Atomic, Molecular and Optica Vol.52 No.19
<P>A new electron scattering apparatus is developed based on concepts from the positron system built by Surko <I>et al</I> (1988). In an electron version of the system, the electron beam is provided by a cathode and the rest of the system is correspondingly modified to a simpler system. The system was tested by measuring electron scattering from argon to verify its operation. N<SUB>2</SUB>O is important in the atmosphere and plasma processes, and in the intermediate energy region from 5 eV to 50 eV, there are two previous results for the electron scattering total cross-section which are in disagreement. We present here a new measurement for the total electron cross-section of N<SUB>2</SUB>O, helping to resolve this disagreement.</P>
Pyun, Chang-Won,Abd El-Aty, A. M.,Hashim, M. M. M.,Shim, Jae-Han,Lee, Si-Kyung,Choi, Kang-Duk,Park, Kwan-Ha,Shin, Ho-Chul,Lee, ChiHo John Wiley Sons, Ltd. 2008 Biomedical chromatography Vol.22 No.3
<P>A solid-phase fluorescence immunoassay (SPFIA) that was primarily developed for detection of antibiotic residues in milk was qualitatively applied for the pre-screening of the residues of aminoglycoside antibiotics, streptomycin and dihydrostreptomycin, in meat press juice. The confirmation of both analytes was performed using a validated method of highperformance liquid chromatography with post-column derivatization. The analytical performance was demonstrated by the analysis of pork meat samples spiked at three concentration levels, ranging from 0.25 to 2.5 ppm for each analyte. In general, the recoveries ranged from 80.4 to 81.5% and from 79.6 to 84.4% for streptomycin and dihydrostreptomycin, respectively, with relative standard deviations lower than 6%. The limits of detection were 0.1 and 0.15 ppm for streptomycin and dihydrostreptomycin, respectively, and the limits of quantification of 0.35 and 0.5 ppm are below the maximum residue limits of Codex, the European Union, and the Korean Food and Drug Administration (ranging from 0.5 to 0.6 ppm). Eight real samples collected from the Seoul area were first monitored using SPFIA, and none of them were found positive. These findings are in good accordance with those observed by HPLC analysis. To the best of our knowledge, this is the first report to monitor the aminoglycoside residues in pork meat press juice using SPFIA. Copyright © 2007 John Wiley & Sons, Ltd.</P>
임베디드 보드를 이용한 CAN BUS연계형 차량용 복합통신모듈의 프로토타입 H/W구성에 관한 연구
편용훈(Pyun Yong-Hun),신명철(Shin Myung-Chul),이종주(Lee Jong-Joo),이광직(Lee Kwang-Jik),김광호(Kim Kwang-Ho),최성진(Choi Sung-Jin),차재상(Cha Jae-Sang) 한국방송·미디어공학회 2006 한국방송공학회 학술발표대회 논문집 Vol.2006 No.-
지능형 차량정보 시스템은 21세기 교통체계로 기대를 모으고 있는 ITS(Intellligent Transport System)의 구축에 핵심이 되는 시스템이다. 이러한 시스템을 구현하기 위해서 종래의 네비게이션, 차량용 무선통신, 차량진단 등의 단일화된 시스템을 통합적으로 수행하며, 계측 또는 수집된 데이터를 분석하여 지능적으로 차량의 주행 상태를 분석 / 진단함으로써 차량에서의 안전한 운행과 운전자 및 승객들이 요구하는 정보 또는 다양한 서비스를 제공하기 위한 새로운 모듈의 개발이 절실히 필요한 실정이다. 따라서, 본 논문에서는 CAN(Controller Area Network) BUS을 이용한 차량의 상태수집 모듈과 능동 데이터베이스에 관해 기술하고 이를 통합하기 위한 임베디드 보드를 이용한 CAN BUS연계형 차량용 복합통신모듈의 프 로토타입 H/W을 구성하여 실용화 가능성 및 유용성을 제시하고자 하였다.