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Experimental observations of spectral changes produced by individual microscopic spheres.
Jung, JaeHwang,Park, YongKeun Optical Society of America 2015 Optics letters Vol.40 No.6
<P>Spectral changes in individual micrometer-sized scatters are experimentally measured. Using an interferometric microscope equipped with a wavelength-swept illumination, the optical fields diffracted from the individual scatters are measured precisely, from which 2D light scattering spectra were retrieved as functions of the wavelength and scattering angle. In the measured scattering spectra of individual scatters, spectral shifts were clearly observed, which is also directly explained using the Mie scattering theory.</P>
Identification of quantitative trait loci for fusarium wilt resistance in radish (Raphanus sativus)
Juyeon Jung,Jaehwang Ryu,Yeonok Choi,Young-Pyo Lee 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Radish, Raphanus sativus(2n = 18), belonging to the brassicaceae family, is herbaceous plant with 1-2 years life cycle. It is cultivated worldwide for producing leafy and root vegetables. Although an economically important crop, the genetics of yield and quality traits, disease resistance are not well-studies. The major purpose of this project is development of molecular breeding technology in radish. In this project, quantitative trait loci (QTL) for Fusarium wilt resistance of radish were analyzed. To identify QTL, genetic linkage map of radish was constructed using F2 mapping population derived from a cross between two inbred lines, “DB01” (resistant) and “DB05” (susceptible). A total 319 markers have been mapped into nine linkage groups, covering 639.3cM with an average distance of 2cM between loci. QTL mapping detected 2 loci conferring Fusarium wilt resistance. Two QTLs were located on LG3 and LG7, respectively. The QTL of LG3, flanked by EAGGMCT6 and WALK500 marker, exhibited a LOD value ranging from 2.3 to 8.7, and the R2 (Phenotypic variations) ranging from 28 to 48% in four tests. This QTL was named qYR1. The QTL of LG7, flanked by EACCMCAC-202 and DCJ14-390 marker, exhibited a LOD value ranging from 6.2 to 10.6, and the R2 ranging from 42 to 55% in four tests. This QTL was named qYR2. The results of the QTL analysis may be useful in marker-assisted selection (MAS) of Fusarium wilt resistant radish cultivars.
정영범(Yungbum Jung),김재황(Jaehwang Kim),신재호(Jaeho Shin),이광근(Kwangkeun Yi) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
아이락(Airac)은 C 프로그램의 버퍼오버런(buffer overrun)오류를 찾아주는 정적 프로그램 분석기(static program analyzer)이다. 아이락은 요약해석(abstract interpretation)의 틀 속에서 디자인되었다. 설계 및 구현 과정에서 프로그램 분석 분야에서 축적되어온 다양한 기술들을 적용하여 분석의 성능 및 정확도 향상을 이룩하였다. 아이락은 리눅스 커널(linux kernel), GNU 소프트웨어, 상용 소프트웨어등에 적용되어 오류를 찾아냈다.
Label-free identification of individual bacteria using Fourier transform light scattering.
Jo, YoungJu,Jung, JaeHwang,Kim, Min-Hyeok,Park, HyunJoo,Kang, Suk-Jo,Park, YongKeun Optical Society of America 2015 Optics express Vol.23 No.12
<P>Rapid identification of bacterial species is crucial in medicine and food hygiene. In order to achieve rapid and label-free identification of bacterial species at the single bacterium level, we propose and experimentally demonstrate an optical method based on Fourier transform light scattering (FTLS) measurements and statistical classification. For individual rod-shaped bacteria belonging to four bacterial species (Listeria monocytogenes, Escherichia coli, Lactobacillus casei, and Bacillus subtilis), two-dimensional angle-resolved light scattering maps are precisely measured using FTLS technique. The scattering maps are then systematically analyzed, employing statistical classification in order to extract the unique fingerprint patterns for each species, so that a new unidentified bacterium can be identified by a single light scattering measurement. The single-bacterial and label-free nature of our method suggests wide applicability for rapid point-of-care bacterial diagnosis.</P>
So Young CHOI,Jeonghun OH,JaeHwang JUNG,YongKeun PARK,Sang Yup LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
As plastic pollution has been emerging as a serious environmental problem, polyhydroxyalkanoates (PHAs) have been attracting much attention. PHAs are biodegradable natural polymers accumulated in the form of insoluble granules within numerous microorganisms and can be used for various applications such as disposable products, packaging, and medical uses. Despite great advances in PHA research, spatiotemporal characteristics of PHA granule formation in a live bacterial cell are not well understood due to technical limitations. Here, we observed and quantitatively analyzed how PHA granule is being accumulated in living bacteria cells through 3D holographic microscopy. A deeper understanding of PHA granule formation in vivo is now possible, which will help develop efficient microbial plastic factories.