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- 저자 : Jang-Cheon Cho (검색결과 247 건)
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( Jae Young Jang ),( Soung Won Jeong ),( Sung Ran Cheon1 ),( Sae Hwan Lee1 ),( Sang Gyune Kim ),( Young Koog Cheon ),( Young Seok Kim1 ),( Young Deok Cho1 ),( Hong Soo Kim ),( So Young Jin ),( Yun Soo 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3
Background/Aims: We investigated the frequency of occult hepatitis B virus (HBV) infection in anti-hepatitis C virus (HCV)-positive individuals and the effects of occult HBV infection on the severity of liver disease. Methods: Seventy-one hepatitis B virus surface-antigen (HBsAg)-negative patients were divided according to their HBV serological status into groups A (anti-HBc positive, anti-HBs negative; n=18), B (anti-HBc positive, anti-HBs positive; n=34), and C (anti-HBc negative, anti-HBs positive/negative; n=19), and by anti-HCV positivity (anti-HCV positive; n=32 vs. anti-HCV negative; n=39). Liver biopsy samples were taken, and HBV DNA was quantified by real-time PCR. Results: Intrahepatic HBV DNA was detected in 32.4% (23/71) of the entire cohort, and HBV DNA levels were invariably low in the different groups. Occult HBV infection was detected more frequently in the anti-HBc-positive patients. Intrahepatic HBV DNA was detected in 28.1% (9/32) of the anti-HCV-positive and 35.9% (14/39) of the anti-HCV-negative subjects. The HCV genotype did not affect the detection rate of intrahepatic HBV DNA. In anti-HCV-positive cases, occult HBV infection did not affect liver disease severity. Conclusions: Low levels of intrahepatic HBV DNA were detected frequently in both HBsAg-negative and anti-HCV-positive cases. However, the frequency of occult HBV infection was not affected by the presence of hepatitis C, and occult HBV infection did not have a significant effect on the disease severity of hepatitis C. (Korean J Hepatol 2011;17:206-212)
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알레르기성 비염 환자에서 절지동물성 특이항원의 양성율 및 항원간 일치율
황규윤,남해선,박준수,권준택,백병준,김장묵,오천환,조성란 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2
The current study was designed to evaluate the positive rates of arthropod allergens by Korean inhalant panel of MAST-CLA in patients with allergic rhinitis. One hundred sixty patients, diagnosed to allergic rhinitis in an Out Patient Center of Soonchunhyang University Chunan Hopsital during Aug 1998 to July 2000, were studied. 1. The overall positive rate among 35 specific allergens was 59.4% (95 patients). 2. The arthropod related allergen accounted for 82.1% (78 patients) of the positive rate. 3. Each positive rate of Dermatophagoides farinae (Df), Dermatophagoides pteronyssinus (Dp), house dust (Hd), and cockroach mix (Cm) was 45.0% (72 patients), 43.1% (69 patients), 28.1% (45 patients), and 8.8% (14 patients), respectively. 4.Significant agreement between arthropod allergens was observer (P < 0.05). 5. The obseved agreement between Df and Dp was 95.6%, showing most significant Kappa index (Kappa = 0.911, P < 0.001). There results suggested that although MAST-CLA is a useful measure of identifying specific allergens, the specificity of two mite allergen relatively low, implying because of common allergen between mites in Korean panel of MAST-CLA. Our data also supported that arthropod is the major cause of allergen in patients with allergic rhinitis, however, the MAST-CLA should be modified in order to exclude common allergen of mite and to include more specific mite allergen.
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Polyphyletic photosynthetic reaction centre genes in oligotrophic marine <i>Gammaproteobacteria</i>
Cho, Jang-Cheon,Stapels, Martha D.,Morris, Robert M.,Vergin, Kevin L.,Schwalbach, Michael S.,Givan, Scott A.,Barofsky, Douglas F.,Giovannoni, Stephen J. BLACKWELL SCIENCE 2007 ENVIRONMENTAL MICROBIOLOGY Vol.9 No.6
<P>Summary</P><P>Ecological studies indicate that aerobic anoxygenic phototrophic bacteria (AAP) that use bacteriochlorophyll to support phototrophic electron transport are widely distributed in the oceans. All cultivated marine AAP are alpha-3 and alpha-4 <I>Proteobacteria</I>, but metagenomic evidence indicates that uncultured AAP <I>Gammaproteobacteria</I> are important members of ocean surface microbial communities. Here we report the description of obligately oligotrophic, marine <I>Gammaproteobacteria</I> that have genes for aerobic anoxygenic photosynthesis. Three strains belonging to the OM60 clade were isolated in autoclaved seawater media. Polymerase chain reaction assays for the <I>puf</I>M gene show that these strains contain photosynthetic reaction centre genes. DNA sequencing and phylogenetic analysis indicate that the <I>puf</I>M genes are polyphyletic, suggesting multiple instances of lateral gene transfer. Peptide sequences from six photosynthesis genes (<I>puf</I>L, <I>puf</I>M, <I>puf</I>C, <I>puf</I>B, <I>puf</I>A and <I>puh</I>A) were detected by proteomic analyses of strain HTCC2080 cells grown aerobically in seawater. They closely match predicted peptides from an environmental seawater bacterial artificial chromosome clone of gammaproteobacterial origin, thus identifying the OM60 clade as a significant source of gammaproteobacterial AAP genes in marine systems. The cell yield and rate of growth of HTCC2080 in autoclaved, aerobic seawater increased in the light. These findings identify the OM60 clade as a source of <I>Gammaproteobacteria</I> AAP genes in coastal oceans, and demonstrate that aerobic, anoxygenic photosynthetic metabolism can enhance the productivity of marine oligotrophic bacteria that also grow heterotrophically in darkness.</P>
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Cho, Jang-Cheon,Giovannoni, Stephen J Society for General Microbiology 2006 International journal of systematic and evolutiona Vol.56 No.4
<P>A Gram-negative, chemoheterotrophic, facultatively anaerobic, slightly halophilic, oval-shaped marine bacterium, designated HTCC2601T, was isolated from the western Sargasso Sea by high-throughput culturing involving dilution to extinction. Although the 16S rRNA gene sequence similarity between the isolate and Salipiger mucosus was 96.5 %, phylogenetic analyses using different treeing algorithms clearly indicated that the strain forms a distinct lineage within a clade containing the recently classified genera Salipiger and Palleronia in the order Rhodobacterales of the Alphaproteobacteria. The DNA-DNA relatedness between strain HTCC2601T and S. mucosus was 26.3 %. Strain HTCC2601T utilized a wide range of carbohydrates, including hexose monomers, sugar alcohols, organic acids and amino acids, as sole carbon sources. The DNA G+C content of strain HTCC2601T was 65.4 mol%, and the predominant constituents of the cellular fatty acids were 18 : 1omega7c (79.7 %) and 11-methyl 18 : 1omega7c (7.5 %). The strain differed from members of the closely related genera Salipiger and Palleronia in its morphological, biochemical and ecological characteristics. On the basis of the taxonomic data obtained in this study, a novel genus and species, Pelagibaca bermudensis gen. nov., sp. nov., is proposed; HTCC2601T (=KCTC 12554T = JCM 13377T) is the type strain of Pelagibaca bermudensis.</P>
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Cho, Jae-Chang,Lee, Dong-Hun,Cheol, Cho-Young,Cho, Jang-Cheon,Kim, Sang-Jong The Microbiological Society of Korea 1996 The journal of microbiology Vol.34 No.3
Microgram quantities of DNA per gram soil were recovered with SDS- based and freeze-and thaw procedures. The average DNA fragment size was > 23 Kb. This method generated minimal shearing of extracted DNA. However, the DNA extracts still contained considerable amounts of humic impurities sufficient to inhibit PCR. Several approaches were used to reduce the interferences with the PCR (use of CTAF in extraction step, Elutip-d column purification, addition of BSA to PCR buffer) to accomplish PCR with DNA extract as a template. Most of the DNA extracts were not digested completely by restriction endonuclease, and CTAB-TREATED ane Elutip-d column purified DNA extracts were partially digested. Regarding as restriction enzyme digestion, all PCRs failed to amplify 16S rRNA gene fragments in the DNA extracts. In the case of DNA extracts only where BSA was added to PCR buffer, PCR was successfully conducted whether the DNA extracts were treated with CTAB or purified with columns. However, these two treatments were indispensable for humic impurity-rich DNA extracts to generate the PCR-compatible DNA samples. Direct extraction of DNA, coupled with these procedures to remove and relieve interferences by humic impurities and followed by the PCR, can be rapid and simple method for molecular microbiological study on soil microorganisms.
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A report of 17 unrecorded bacterial species of Korea belonging to the phylum Bacteroidetes
Cho, Jang-Cheon,Seong, Chi Nam,Joh, Kiseong,Cha, Chang-Jun,Bae, Jin-Woo,Yi, Hana,Lee, Soon Dong,Kim, Myung Kyum,Yoon, Jung-Hoon The National Institute of Biological Resources 2018 Journal of species research Vol.7 No.3
While screening indigenous prokaryotic species in Republic of Korea in 2017, a total of 17 bacterial strains assigned to the phylum Bacteroidetes were isolated from a variety of environmental habitats including water of fountain, tidal flat, plant root, soil, the gut of Russian grayling butterfly, ginseng field, seawater, lagoon and seashore sand. From the 16S rRNA gene sequence similarity of more than 98.7% and the formation of a robust phylogenetic clade with the closest species, it was found that the 17 strains belong to independent and recognized bacterial species. There has been no official report that the identified 17 species have been previously isolated in the Republic of Korea. Thus, 15 species in 10 genera of one family in the order Flavobacteriales, one species in one genus of one family in the order Cytophagales, and one species in one genus of one family in the order Sphingobacteriales are proposed as unrecorded species of the phylum Bacteroidetes found in the Republic of Korea. Gram reaction, colony and cell morphology, basic phenotypic characteristics, isolation source, taxonomic status, strain ID and other information are described in the species descriptions.
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알쯔하이머치매 환자에서 혈청 Homocysteine 농도의 변화와 산화스트레스의 관계
전진숙,이장현,조웅,오병훈 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6
Objectives : The goal of this study was to find an association between elevated blood homocysteine level in Korean patients with dementia of the Alzheimer's type (DAT), to analyze affecting factors, and to identify the role of oxidative stress which was known to be an underlying mechanism of hyperhomocysteinemia in DAT. Methods : The subjected were consisted of 54 patients with dementia of the Alzheimer's type and 54 normal controls with age over 60. The clinical data was obtained by structured interview and medical records. Serum homocysteine, plasma total antioxidant capacity (TAC) and serum apolipoprotein E (apo E) levels were measured, and the cognitive function (Mini-Mental State Examination, MMSE), severity of dementia (Clinical Dementia Rating, CDR/Global Deterioration Scale, GDS), activities of daily living (Activities of Daily Living, ADL/Instrumental Activities of Daily Living, IADL) and severity of depression (Geriatric Depression Scale) were also evaluated using various rating scales. Results : 1) The mean (±S.D.) serum homocysteine level in patients with dementia of the Alzheimer's type (21.69±8.24 μ mol/L) was significantly (p<0.05) higher than the mean (±S.D.) semm homocysteine level in the control group (16.60±4.85 μ mol/L) 2) The mean age and IADL scores of DAT patients with elevated serum homocysteine level were significantly higher than those of DAT patients with normal semm homocysteine level (p<0.05). However, there were no difference between groups in the MMSE, GDS, CDR, ADL, Geriatric Depression Scale, plasma TAC and serum apo E level. 3) The serum homocysteine level in patients with Alzheimer's dementia had no correlation with age, cognitive function, severity of dementia, activities of daily living, severity of depresseion nor plasma TAC and serum apo E level. Conclusion : This study does not support the association between elevated serum homocysteine level and oxidative stress.
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Cheon, Mi-Ju,Choi, Joon-Young,Chung, Jae-Hoon,Lee, Ji-Young,Cho, Sook-Kyung,Yoo, Jang,Park, Soo-Bin,Lee, Kyung-Han,Kim, Byung-Tae The Korea Society of Nuclear Medicine 2011 핵의학 분자영상 Vol.45 No.4
Purpose This study aimed to investigate the differential findings in clinical and biochemical features, and Tc-99m sestamibi (MIBI) dual-phase parathyroid scintigraphy for malignant and benign parathyroid lesions in patients with primary hyperparathyroidism. Methods Subjects were 102 parathyroid lesions from 91 patients with primary hyperparathyroidism. Scintigraphic findings included radioactivity grade, uptake pattern, uptake contour, lesion size on early and delayed images, and degree of washout. Clinical and biochemical features were also evaluated. Histopathology confirmed the final diagnosis for all the patients. Results Final diagnoses were 94 benign parathyroid lesions and 8 parathyroid carcinomas. The patients with parathyroid carcinoma were significantly older (p=0.002) and had significantly higher serum parathyroid hormone concentrations than those with benign parathyroid lesions (p<0.001). All malignant parathyroid lesions showed intense radioactivity similar to or greater than the submandibular gland activity on delayed images (p=0.007), and little radioactivity difference between early and delayed images (p=0.012). The cancer incidence for parathyroid lesions with both intense radioactivity and no washout was 17.0% (8/47). When parathyroid lesions with all of the abovementioned findings were regarded as malignant, the cancer incidence significantly increased from 17.0% to 33.3% (8/24, p<0.001). Conclusion For Tc-99m MIBI dual-phase parathyroid scintigraphy, uptake grade on delayed images and washout were significantly useful diagnostic criteria for differentiating benign from malignant parathyroid lesions, along with age and parathyroid hormone serum concentration.
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