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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>
스포츠팀을 이용한 공익연계마케팅의 효과: 후원기업의 이미지에 따른 분석
김재철 ( Jae Chul Kim ),권형일 ( Hyungil Kwon ),편도영 ( Do Young Pyun ) 한국스포츠산업경영학회 2015 한국스포츠산업경영학회지 Vol.20 No.4
본 연구는 스포츠 팀을 통한 공익연계마케팅을 할 경우, 후원기업의 이미지(i.e., 긍정적인 이미지의 기업과 부정적인 이미지의 기업)에 따라서 공익연계마케팅에 대한 소비자들의 태도 차이를 알아보았다. 먼저 후원기업의 이미지에 따른 소비자들의 태도변화의 양과 방향성에 대해서 규명하였다. 이를 알아보기 위해 수도권에 위치한 C대학교 학부생을 대상으로 설문지 220부가 회수되었다. 그 중 불성실한 1부를 제외한 219부가 최종적인 자료 분석에 사용되었으며, 자료 분석은 SPSS 18.0을 통해 이용되었다. 본 연구에서 설정한 가설들을 검증하기 위해 대응표본(paired-sample) t-test가 이용되었다. 본 연구의 분석결과 긍정적인 이미지를 가진 기업이 공익을 후원할 경우, 스포츠 팀에 대한 태도는 정적인 방향으로 변화하다. 하지만 후원기업에 대한 태도변화는 통계적으로 유의하지 않았다. 따라서 가설 1b는 지지되었지만 1a는 지지되지 않았다. 그리고 부정적인 이미지의 기업이 공익을 후원할 경우, 후원기업에 대한 태도는 정적인 방향으로 상승하였고, 스포츠 팀에 대한 태도는 부적인 방향으로 감소하였다. 따라서 가설 2a와 2b는 모두 지지되었다. Cause related marketing has been widely used by many companies with an expectation that it would improve its sales and public image. However, previous literature has not investigated the effect of cause related marketing when a sponsoring company has built negative image in the society. Thus, this study was designed to see if a company with a negative image can be benefitted from such a marketing effort. The magnitude and direction of changes in consumers` attitudes toward two sponsoring companies with conflicting (positive vs. negative) brand images and toward a sport team were tested using paired t-tests. The results indicated that the subjects` initial attitude toward the sport team was significantly changed in a positive direction when it was sponsored by a company with positive brand image (i.e., Nike). However, a change of attitude toward the company was not statistically significant. On the other hand, an initial attitude toward a company with negative image (i.e., Kangwon Land Hotel & Casino) improved significantly when it implemented cause-related marketing with a college sport team. However, their initial attitudes toward the sport team aggravated significantly when it was connected to a company with negative image in cause-related marketing.