C3, C4 의 Nephelometric 측정 경험

조병철 ( B C Cho ),검덕희 ( D H Kim ),김민숙 ( M S Kim ),서덕규 ( D K Seo ) 대한임상검사과학회 1990 대한임상검사과학회지(KJCLS) Vol.22 No.1

RIA has been used to measure accurately a minute quantity of Ags, such as proteins. hormones, enzymes or drugs. However, due to the presence of a radication hazard and the increment of having to pool test specimens. RIA is gradually being replaced by other immunoassay that have a comparable sensitivity but do not require radiocative meterial. Turbidimetric immunoassay, latex immunoassay and fluorescence immunoassay are such examples. We at the department of clinical pathology, Asan medical center, compared CH 50 activity with C3 , C4 quantity by nephelometric method.

Effects of ¹⁴C-labelled precursor feeding on production of beauvericin, enniatins H, I, and MK1688 by Fusarium oxysporum KFCC11363P

Lee, H.S.,Kim, K.A.,Seo, D.G.,Lee, C. Society for Bioscience and Bioengineering, Japan ; 2012 Journal of bioscience and bioengineering Vol.113 No.1

The effects of <SUP>14</SUP>C-labelled precursor feeding on the production of cyclic hexadepsipeptides were investigated by the mycelium of F. oxysporum KFCC11363P producing beauvericin along with enniatins H, I, and MK1688. Most <SUP>14</SUP>C-phenylalanine and <SUP>14</SUP>C-valine were incorporated easily into the biosynthetic pathway of <SUP>14</SUP>C-labelled beauvericin in vivo by the mycelium. However, only a small amount of <SUP>14</SUP>C-labelled enniatins could be detected by feeding of <SUP>14</SUP>C-valine. When l-valine was fed as a precursor to the mycelium at large scale, the level of beauvericin increased to maximum followed by enniatins H and I. Feeding of l-valine did not affect the production of enniatin MK1688. These results suggest that l-valine feeding led to the production of d-hydroxyisovaleic acid in the mycelium and specifically enhanced the production of cyclic hexadepsipeptides containing d-hydroxyisovaleic acid, such as beauvericin and enniatins H and I.

Ion scattering spectroscopy study of the Si(001)c(4x4)-C surface reconstruction

Park J. Y.,Chae K. H.,Choi D. S.,Kim J. Y.,Kim S. S.,Seo J. H.,Whang C. N. 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3

Reconstructed Si(001)c(4 4)-C surface has been studied by coaxial impact collision ion scattering spectroscopy (CAICISS). When 100L ethylene (C2H4) was exposed on Si(001)-(2 1) surface at 700 C, Si(001) dimer structures were changed by induced carbon (C) atoms. The experimental CAICISS spectra and simulation results reveal that the reconstructed Si(001)c(4 4)-C surface shows good agreement with the missing dimer model, rather than the Si-C heterodimer model, and adsorbed C atoms in uence only the reconstructed vertical plane of Si(001) surface. On comparing the azimuthal-scan curves for 100L C/Si(001) with those for clean Si(001), it can be suggested that C atoms occupy the fourth subsurface layer of Si(001) directly below the HB (bridge) site. These results are new evidence supporting the previous studies based on the C incorporation into Si(001) surface with missing dimers and the substitution of the fourth Si layers.

Characterization of Insertional Variation of Porcine Endogenous Retroviruses in Six Different Pig Breeds

Jung, W.Y.,Yu, S.L.,Seo, D.W.,Jung, K.C.,Cho, I.C.,Lim, H.T.,Jin, D.I.,Lee, Jun-Heon Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.10

Pigs may need to be exploited as xenotransplantation donors due to the shortage of human organs, tissues and cells. Porcine endogenous retroviruses (PERVs) are a significant obstacle to xenotransplantation because they can infect human cells in vitro and have the potential for transmission of unexpected pathogens to humans. In this research, 101 pigs, including four commercial breeds (23 Berkshire, 13 Duroc, 22 Landrace and 14 Yorkshire pigs), one native breed (19 Korean native pigs) and one miniature breed (10 NIH miniature pigs) were used to investigate insertional variations for 11 PERV loci (three PERV-A, six PERV-B and two PERV-C). Over 60% of the pigs harbored one PERV-A (907F8) integration and five PERV-B (B3-3G, B3-7G, 742H1, 1155D9 and 465D1) integrations. However, two PERV-A loci (A1-6C and 1347C1) and one PERV-B locus (B3-7F) were absent in Duroc pigs. Moreover, two PERV-C loci (C2-6C and C4-2G) only existed in Korean native pigs and NIH miniature pigs. The results suggest that PERV insertional variations differ among pig breeds as well as among individuals within a breed. Also, the results presented here can be used for the selection of animals that do not have specific PERV integration for xenotransplantation research.

Interleukin-18, transforming growth factor-β, and vascular endothelial growth factor gene polymorphisms and susceptibility to primary glomerulonephritis

Choi, H.-J.,Cho, J.-H.,Kim, J.-C.,Seo, H.-J.,Hyun, S.-H.,Kim, G.-H.,Choi, J.-Y.,Choi, H.-J.,Ryu, H.-M.,Cho, J.-H.,Park, S.-H.,Kim, Y.-L.,Han, S.,Kim, C.-D. Blackwell Publishing Ltd 2010 Tissue antigens Vol.76 No.4

<P>Several studies have showed an association of gene polymorphisms with the development of glomerulonephritis (GN). We investigated the effects of gene polymorphisms on the development of GN by analyzing polymorphisms in the interleukin (IL)-18, transforming growth factor (TGF)-β, and vascular endothelial growth factor (VEGF) genes in Korean patients with primary GN. The study included 146 normal subjects (controls) and 100 patients diagnosed with primary GN by kidney biopsy. The gene polymorphisms A-607C and G-137C in <I>IL-18</I>, C-509T and T869C in <I>TGF-</I>β<I>1</I>, and C-2578A and C405G in <I>VEGF</I> were investigated in DNA extracted from peripheral blood. Significant differences were observed between the GN and control groups in the genotype and allele frequencies of A-607C <I>IL-18</I> and C405G <I>VEGF</I>. The frequencies of the <I>IL-18</I>−607CC genotype [<I>P</I> = 0.001, odds ratio (OR) = 2.473] and the <I>VEGF</I> 405GG genotype (<I>P</I> = 0.001, OR = 2.473) were significantly increased in the GN group. The combination of <I>IL-18</I>−607CC+ and <I>VEGF</I> 405GG+ genotypes had a higher risk for developing GN in comparison with the combination of <I>IL-18</I>−607CC− and <I>VEGF</I> 405GG− genotypes (<I>P</I> < 0.001, OR = 8.642). In the haplotype analysis of the <I>IL-18</I> gene, the CG haplotype was significantly more frequent in the GN group than the control group (61.5% <I>vs</I> 46.9%, <I>P</I> = 0.002). These results show that the −607CC genotype of the <I>IL-18</I> gene and the 405GG genotype of the <I>VEGF</I> gene are associated with susceptibility to and the development of primary GN.</P>

Geochemical and mineralogical characteristics of the Yonghwa phoscorite-carbonatite complex, South Korea, and genetic implications

Seo, J.,Choi, S.,Park, J.,Whattam, S.,Kim, D.W.,Ryu, I.,Oh, C.W. Universitetsforlaget ; Elsevier Science Ltd 2016 Lithos Vol.262 No.-

<P>The Yonghwa phoscorite-carbonatite complex occurs as an isolated individual body with an inclined pipe shape within the Precambrian Gyeonggi Massif, South Korea. The phoscorite consists mainly of olivine, apatite, magnetite, carbonates, amphibole, and phlogopite, and can be subdivided into two types, olivine-rich and apatite-rich. The carbonatite is composed of calcite, Mg-rich dolomite, Fe-rich dolomite, magnetite, apatite, and/or siderite. Intensive fenitization occurred along the boundary between the complex and the wall rocks of leucocratic banded gneiss and garnet-bearing metabasite. The paragenetic sequences of the phoscorite-carbonatite complex demonstrate that the early crystallization of silicate minerals was followed by the crystallization of carbonates as the carbonatitic melt cooled. Magnetite occurs within the complex, and the carbonatites have Fe contents that are higher than typical ferrocarbonatites, due to the high magnetite contents. The rare earth elements (REEs) in the phoscorites and carbonatites are weakly fractionated and show enrichments of LREEs and Nb relative to HREEs. Furthermore, the apatites reflect the fractionated trends of LREEs relative to HREEs. Phoscorite apatites are enriched in Sr and show substitutions between Ca and Sr. Mica chemistry reflects the evolutionary trend of Fe2+ and Mg2+ in the phoscorite-carbonatite melt without Al substitution. Micas exhibit high values of Mg# in the phoscorite-carbonatite complex, but lower values in fenites. Via thermodynamic analysis, the early stability fields of magnetite-pyrrhotite-graphite-carbonate assemblages indicate that the Yonghwa phoscorite and carbonatite crystallized under conditions of 600 degrees C, 2 kbar, and X-CO2 = 0.2. Afterward, melts underwent an evolution to the late stability fields of magnetite-pyrite-pyrrhotite-ilmenite assemblages. The delta C-13 and 8180 isotopic compositions of carbonates in the Yonghwa phoscorite-carbonatite complex are -8.2 parts per thousand to -3.4 parts per thousand and 6.6 to 11.0 parts per thousand., respectively, and together with the sulfur isotope compositions of the sulfides (delta S-34 values of about 0.2 parts per thousand to 2.2 parts per thousand) indicate a primary mantle source of the magmas. Phlogopites from the fenites yielded K-Ar ages of 193.4 +/- 4.9 and 195.0 +/- 5.1 Ma, which demarcate the timing of the cooling of the phoscorite-carbonatite intrusion, and indicate that the phoscorite-carbonatite may be related to a post-collisional magmatic regime. The discovery of this complex marks the first known occurrence in Korea, of Fe and Nb-REE mineralization related to phoscorite-carbonatite igneous activity. (C) 2016 Elsevier B.V. All rights reserved.</P>

D/H VLCC의 피로강도해석과 피로 신뢰성 해석

양박달치(P. D. C. Yang),이주성(J. S. Lee),윤장호(J. H. Yoon),서영석(Y. S. Seo) 대한조선학회 1997 大韓造船學會 論文集 Vol.34 No.2

Inhibition of Murine Norovirus and Feline Calicivirus by Edible Herbal Extracts

Seo, D. J.,Choi, C. Springer Science + Business Media 2017 Food and environmental virology Vol.9 No.1

<P>Human noroviruses (HuNoVs) cause foodborne and waterborne viral gastroenteritis worldwide. Because HuNoV culture systems have not been developed thus far, no available medicines or vaccines preventing infection with HuNoVs exist. Some herbal extracts were considered as phytomedicines because of their bioactive components. In this study, the inhibitory effects of 29 edible herbal extracts against the norovirus surrogates murine norovirus (MNV) and feline calicivirus (FCV) were examined. FCV was significantly inhibited to 86.89 +/- 2.01 and 48.71 +/- 7.38% by 100 mu g/mL of Camellia sinensis and Ficus carica, respectively. Similarly, ribavirin at a concentration of 100 mu M significantly reduced the titer of FCV by 77.69 +/- 10.40%. Pleuropterus multiflorus (20 mu g/mL) showed antiviral activity of 53.33 +/- 5.77, and 50.00 +/- 16.67% inhibition was observed after treatment with 20 mu g/mL of Alnus japonica. MNV was inhibited with ribavirin by 59.22 +/- 16.28% at a concentration of 100 mu M. Interestingly, MNV was significantly inhibited with 150 A mu g/mL Inonotus obliquus and 50 mu g/mL Crataegus pinnatifida by 91.67 +/- 5.05 and 57.66 +/- 3.36%, respectively. Treatment with 20 A mu g/mL Coriandrum sativum slightly reduced MNV by 45.24 +/- 4.12%. The seven herbal extracts of C. sinensis, F. carica, P. multiflorus, A. japonica, I. obliquus, C. pinnatifida, and C. sativum may have the potential to control noroviruses without cytotoxicity.</P>

The Changing Pattern of Parasitic Infection Among Korean Populations by Paleoparasitological Study of Joseon Dynasty Mummies

Seo, M.,Oh, C.S.,Chai, J.-Y.,Jeong, M.S.,Hong, S.W.,Seo, Y.-M.,Shin, D.H. JOURNAL OF PARASITOLOGY 2014 The Journal of parasitology Vol.100 No.1

In the coprolites of 4 recently discovered Joseon mummies of Korea, we found Ascaris lumbricoides, Trichuris trichiura, Metagonimus yokogawai, Paragonimus westermani, and Clonorchis sinensis eggs. The current finding was compared with previous paleoparasitological data, and with recent national survey data from Korea. For A. lumbricoides and T. trichiura, similar patterns of infection prevalence were observed between the national survey of 1961 and our current Joseon data. Some of the trematode species (C.sinenesis and P. westermani) showed much higher infection prevalences among the Joseon Koreans than among their 1960s descendants. The present results indicate that the decrease in trematode infection rates might have begun earlier than was the case for nematode infection.

Characterization of a recombinant 7,8-linoleate diol synthase from Glomerella cingulate

Seo, M. J.,Shin, K. C.,An, J. U.,Kang, W. R.,Ko, Y. J.,Oh, D. K. Springer Science + Business Media 2016 Applied microbiology and biotechnology Vol.100 No.7

<P>A putative diol synthase from the fungus Glomerella cingulate was cloned and expressed in Escherichia coli. The putative diol synthase from G. cingulate was purified by His-Trap affinity chromatography with a specific activity of 0.87 U mg(-1), an eightfold purification, and a yield of 28 %. One unit of activity was defined as the amount of enzyme required to produce 1 mu mol of 7,8-dihydroxy-9,12(Z,Z)-octadecadienoic acid (7,8-DiHODE) per min. The purified enzyme was estimated as a 127-kDa tetramer with a molecular mass of 510 kDa by gel filtration chromatography. The enzyme converted linoleic acid to a product, identified as 7S,8S-DiHODE by liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) and nuclear magnetic resonance (NMR) spectroscopy. The specific activity and catalytic efficiency (k (cat)/K (m)) of 7,8-diol synthase from G. cingulate for the conversion of fatty acid to dihydroxy fatty acid followed the order linoleic acid > I +/--linolenic acid > oleic acid > palmitoleic acid, indicating that the enzyme is a 7,8-linoleate diol synthase (7,8-LDS). The activity of the enzyme for the conversion of 7,8-DiHODE from linoleic acid was maximal at pH 6.5, 40 A degrees C, and 2.5 % (v/v) dimethyl sulfoxide (DMSO). Under these conditions, 7,8-LDS from G. cingulate converted 1.0 mM linoleic acid to 0.62 mM 7,8-DiHODE for 30 min, with a conversion yield of 62 % (mol/mol), via 8-hydroperoxy-9,12(Z,Z)-octadecadienoic acid (8-HPODE) as an intermediate. The accumulation of 8-HPODE was due to a higher 8-dioxygenase activity in the N-terminal domain than hydroperoxide isomerase activity in the C-terminal domain.</P>