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Coherent X-ray Diffraction Imaging with Single-pulse Table-top Soft X-ray Laser

  • Kang, Hyon-Chol;Kim, H.T.;Lee, S.K.;Kim, C.M.;Choi, I.W.;Yu, T.J.;Sung, J.H.;Hafz, N.;Jeong, T.M.;Kang, S.W.;Jin, Y.Y.;Noh, Y.C.;Ko, D.K.;Kim, S.S.;Marathe, S.;Kim, S.N.;Kim, C.;Noh, D.Y.;Lee, J.
    • Proceedings of the Optical Society of Korea Conference
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    • pp.429-430
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    • 2008
  • We demonstrate coherent x-ray diffraction imaging using table-top x-ray laser at a wavelength of 13.9nm driven by 10-Hz ti:Sapphire laser system at the Advanced Photonics Research Institute in Korea. Since the flux of x-ray photons reaches as high as $10^9$ photons/pulse in a $20{\times}20{\mu}m^2$ field of view, we measured a ingle-pulse diffraction pattern of a micrometer-scale object with high dynamic range of diffraction intensities and successfully reconstructed to the image using phase retrieval algorithm with an oversampling ratio of 1:6. the imaging resolution is $^{\sim}150$ nm, while that is much improved by stacking the many diffraction patterns. This demonstration can be extended to the biological sample with the diffraction limited resolution.

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Identification of a Bromodomain-containing Protein 2 (BRD2) Gene Polymorphic Variant and Its Effects on Pork Quality Traits in Berkshire Pigs

  • Lee, Dong Ju;Hwang, Jung Hye;Ha, Jeongim;Yu, Go Eun;Kwon, Seulgi;Park, Da Hye;Kang, Deok Gyeong;Kim, Tae Wan;Park, Hwa Chun;An, Sang Mi;Kim, Chul Wook
    • Food Science of Animal Resources
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    • v.38 no.4
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    • pp.703-710
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    • 2018
  • Bromodomain-containing protein 2 (BRD2) is a nuclear serine/threonine kinase involved in transcriptional regulation. We investigated the expression and association of the BRD2 gene as a candidate gene for meat quality traits in Berkshire pigs. BRD2 mRNA was expressed at relatively high levels in muscle tissue. Statistical analysis revealed that the c.1709G>C polymorphism of the BRD2 gene was significantly associated with carcass weight, meat color ($a^*$, redness), protein content, cooking loss, water-holding capacity, carcass temperatures 4, 12 and 24 h postmortem, and the 24 h postmortem pH in 384 Berkshire pigs. Therefore, this polymorphism in the porcine BRD2 gene may be used as a candidate genetic marker to improve meat quality traits in pigs.

The rs196952262 Polymorphism of the AGPAT5 Gene is Associated with Meat Quality in Berkshire Pigs

  • Park, Woo Bum;An, Sang Mi;Yu, Go Eun;Kwon, Seulgi;Hwang, Jung Hye;Park, Da Hye;Kang, Deok Gyeong;Kim, Tae Wan;Park, Hwa Chun;Ha, Jeongim;Kim, Chul Wook
    • Food Science of Animal Resources
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    • v.37 no.6
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    • pp.926-930
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    • 2017
  • High-quality meat is of great economic importance to the pig industry. The 1-acylglycerol-3-phosphate-O-acyltransferase 5 (AGPAT5) enzyme converts lysophosphatidic acid to phosphatidic acid in the mitochondrial membrane. In this study, we found that the porcine AGPAT5 gene was highly expressed in muscle tissue, influencing meat characteristics, and we also identified a non-synonymous single-nucleotide polymorphism (nsSNP) (rs196952262, c.673 A>G) in the gene, associated with a change of isoleucine 225 to valine. The presence of this nsSNP was significantly associated with meat color (lightness), lower cooking loss, and lower carcass temperatures 1, 4, and 12 h after slaughter (items T1, T4, and T12 on the recognized quality scale, respectively), and tended to increase backfat thickness and the water-holding capacity. These results suggest that nsSNP (c.673A>G) of the AGPAT5 gene is a potential genetic marker of high meat quality in pigs.

Current driven nanosecond skyrmion dynamics

  • Song, Kyung Mee;Woo, Seonghoon;Han, Hee-Seung;Jung, Min Seung;Im, Mi-Young;Lee, Ki-Suk;Song, Kun Soo;Kim, Jae-Sung;Fischer, Peter;Hong, Jung Il;Choi, Jun Woo;Min, Byeong-Chul;Koo, Hyun Cheol;Chang, Joonyeon
    • Proceedings of the Korean Magnestics Society Conference
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    • pp.204-204
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    • 2016
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Topomer-CoMFA Study of Tricyclic Azepine Derivatives-EGFR Inhibitors

  • Chung, Jae-Yoon;Pasha, F.A.;Chung, Hwan-Won;Yang, Beom-Seok;Lee, Cheol-Ju;Oh, Jung-Soo;Moon, Myoung-Woon;Cho, Seung-Joo;Cho, Art E.
    • Molecular & Cellular Toxicology
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    • v.4 no.1
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    • pp.78-84
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    • 2008
  • EGFR has been intensively investigated as a target to block the signal transduction pathway which stimulates cancer growth and metastasis. Studies about structure-activity relationship for tricyclic azepine derivatives were performed with topomer-CoMFA. The derived topomer-CoMFA model with steric and electrostatic field parameters based on fragment units gave reasonable statistics ($q^2$=0.561, $r^2$=0.679). The model explains why a halogen atom at the meta position of aniline is important to increases inhibitory activity. This comes from an electrostatically negative groups are favored near this region. The model also shows that there are sterically favored regions around methoxy group extended from oxazepine derivatives. The findings about steric and electrostatic effects can be utilized for designing new inhibitors.