15 results on '"Chang Young Park"'
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2. Response of Millet and Sorghum to Water Stress in Converted Poorly Drained Paddy Soil
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In-Seok Oh, Ki-Yuol Jung, Chang-Young Park, Eul-Soo Yun, Jae-Bok Hwang, and Young-Dae Choi
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Crop ,Geography ,Agronomy ,biology ,Soil water ,Foxtail ,Moisture stress ,Drainage ,Sorghum ,biology.organism_classification ,Water content ,Panicle - Abstract
Millet and sorghum are major dryland cereal crops, however their growth and productivity is limited by soil water stress with varying intensity. The major objective of this study was to evaluate water stress of millet and sorghum yield under drainage classes of poorly drained soil and to test the effect of the installed pipe drainage in poorly drained paddy soil to minimize crop stress. The research was carried out in poorly drained paddy fields located at alluvial slopping area resulting in non-uniform water content distribution by the inflow of ground water from the upper part of the field. Stress Day Index (SDI) was determined from a stress day factor (SD) and a crop susceptibility factor (CS). SD is a degree of measurement by calculating the daily sum of excess water in the profile above 30cm soil depth (SEW30). CS depends on a given excess water on crop stage. The results showed that sum of excess water day (SWD30) used to represent the moisture stress index was lower on somewhat poorly drained soil compared with poorly drained soil on 117 days. CS values for sorghum were 57% on 3rd leaf stage, 44% on 5 th leaf stage, 37% on panicle initiation, 23% on boot stage, and 16% on soft dough stage. For proso millet CS values were 84% on 3 rd leaf stage, 70% on 5 th leaf Stage, 65% on panicle initiation, 53% on boot stage, and 28% on soft dough stage. And for foxtail millet the values were 73% on 3 rd leaf stage, 61% on 5 th leaf stage, 50% on panicle initiation, 29% on boot stage, and 15% on soft dough stage. SDI of sorghum and millet was more susceptible to excess soil water during panicle initation stage more poorly drained soil than somewhat poorly drained soil. Grain yield was reduced especially in proso millet and Foxtail millet compared to Sorghum.
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- 2013
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3. Changes of Soil Physical Properties by Manured Sorghum Residues Incorporation
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Young-Dae Choi, In-Seok Oh, Ki-Yuol Jung, Chang-Young Park, Eul-Soo Yun, and Jae-Bok Hwang
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Crop residue ,Materials science ,biology ,Straw ,Sorghum ,biology.organism_classification ,Manure ,Bulk density ,Agronomy ,visual_art ,Soil water ,visual_art.visual_art_medium ,Sawdust ,Stover - Abstract
Although sorghum residue production was estimated to be 8~10 Mg ha -1 , most sorghum straw was used to be burnt or removed after harvest. This experiment was conducted to evaluate the effect of the incorporation of manured sorghum residues on soil physical properties from 2010 to 2012 in the converted paddy field. Five treatment with 3 replication consisted of control, inorganic fertilizer (NPK), manured residues, sorghum stover and sawdust manure. The incorporation level of organic source was 10 Mg ha -1 without inorganic fertilizer NPK. The investigated physical parameters were bulk density (BD), porosity, water stability aggregate (WSA), water infiltration rater (WIR), penetration resistance (PR) and soil water retention characteristics (WRC) with soil depth. The incorporation of manured sorghum residues improved WIR significantly over inorganic fertilizer (NPK), sorghum residues and sawdust manure. The BD by incorporating with manured residues on sorghum was reduced significantly with crop residue over plot of NPK and sawdust. Significant increase in WSA was observed with stubble incorporation alone or manured sorghum residues. Soil WRC were significantly enhanced with manured sorghum residue incorporated without NPK. The average PR at 0~15 cm was 0.54 MPa for manured sorghum residues. For sawdust manure plot it was 0.42 MPa, for Sawdust manure plot 0.39 MPa and for NPK plot 0.54 MPa.
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- 2013
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4. Effects of Cover Crops and Sowing Methods on Weed Occurrences and Growth and Yield of Sorghum (Sorghum bicolor)
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Young-Dae Choi, Jae-Bok Hwang, Eul-Soo Yun, Sang-In Shim, Seung-Ho Jeon, Ki-Youl Jung, Chang-Young Park, and Hyun-Ju Kim
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Secale ,biology ,fungi ,food and beverages ,Sowing ,biology.organism_classification ,Sorghum ,Vicia villosa ,Horticulture ,Geography ,Agronomy ,Cropping system ,Cover crop ,Weed ,Mulch - Abstract
This study was conducted to evaluate the weed suppressing effects of different cropping system including hairy vetch (Vicia villosa) and rye (Secale cereale) cover crops, polyethylene plastic film, and transplanting film mulching in direct sowing and transplanted sorghum field in 2011. Crop growth and development and weed occurrences in the fields were examined to know the efficiency of proposed cropping system. In polyethylene film mulching treatment, heading date of sorghum was earlier by 3 days than control, on the other hands, rye cover crop mulching delayed heading date by 11 days. Besides the effect of cover crop on the heading of sorghum, the residues changed growth characteristics. Plant height of sorghum was increased by 27.3% at hairy vetch treatment although it was reduced by 47.5% in the rye cover crop treatment. Hairy vetch treatment showed beneficial effects on sorghum growth reduced the occurrences of grasses and broadleaf weeds to 84% and 96%, respectively, as compared to control in sorghum fields. While rye cover crop treatment showed poor sorghum growth reduced less strongly grasses and broadleaf weeds by 35% and 71%, respectively. At harvest, yield of sorghum was greater in order of hairy vetch cover crop > polyethylene film mulching > rye cover crop control in both transplanted and direct sown fields.
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- 2012
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5. Distribution of Weeds with Different Surface Management Systems of Greenhouse Soil in Gyeongnam Province
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Chang-Young Park, Jae-Bok Hwang, Eul-Soo Yun, Min-Hee Nam, and Sung-Tae Park
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Horticulture ,biology ,Agronomy ,Perennial plant ,Eclipta ,Digitaria sanguinalis ,Cyperaceae ,Portulaca ,Weed control ,biology.organism_classification ,Weed ,Cardamine - Abstract
Weed control is of fundamental importance when planting horticultural crops, particularly during the establishment phase. Weeds compete for nutrients, water and light, and can severely threaten the survival and early growth of newly planted crops. Failure to control weeds represents one of the single most important factors leading to crop loss. Knowledge on the existence of the diversity of weed species in greenhouses is of our main concern in this study in order to develop a most efficient and effective weed control strategies. Sixty-two greenhouses were surveyed in 3 cities and counties of Gyeongnam area in March to October 2009 to investigate the feature of weed occurrence in polyvinyl chloride (PVC) after harvesting of the main crops. Forty-one weed species were identified and classified to 18 families which were composed of 14 annual weeds, 18 summer annual weeds and 9 perennial weeds. On the other hand, broadleaf, grasses and sedges recorded with 30, 7 and 4 weed species, respectively. Asteraceae was the most dominant weed species (9 species) noted followed by Poaceae (7 species), Cyperaceae (4 species), Caryophyllaceae and Brassicaceae (3 species respectively) and other families have 1~2 species. The dominant weed species occurred in the greenhouse based on the summed dominance ratio. These weeds were Digitaria sanguinalis, Cyperus iria, Portulaca oleracea, Rorippa islandica, Mazus japonicas, Cardamine flexousa, and Eclipta prostrata and others. Weed occurrence in the greenhouse after horticultural crops consisted of summer annuals (4 species), winter annuals (3 species), and perennial annuals (1 specie). The dominant species occurred in tilled soil based on summed dominance ratio of weeds were Cardamine flexousa (88.1%), Eclipta prostrate (57.4%) and Portulaca oleracea (55.2%). Comparison of weed occurrence was thoroughly surveyed also in which field without PVC, weed species were Portulaca oleracea (55.2), Eclipta prostrata (57.9%) and Trigonotis peduncularis (25.1%) and field with PVC, the identified weeds were Portulaca oleracea (98.75), Trigonotis peduncularis (49.1%), and Eclipta prostrata (36.8%).
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- 2011
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6. Effect of Barley Green Manure on Rice Growth and Yield According to Tillage Date in Spring
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In-Seok Oh, Ui-Gum Kang, Jin-Hee Ryu, Man Park, Jong-Ki Lee, Ki-Yeong Seong, Weon-Tai Jeon, Ja-Hwan Ku, Yong-Hwan Lee, Min-Tae Kim, Hyeoun-Suk Cho, and Chang-Young Park
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Phosphorus ,Crop yield ,food and beverages ,chemistry.chemical_element ,Biology ,engineering.material ,Tillage ,Crop ,Green manure ,Agronomy ,chemistry ,engineering ,Fertilizer ,Cropping system ,Panicle - Abstract
To use barley as a green manure crop, this study has been conducted in Suwon, Gyeonggi-do to establish the barley green manure (BGM)-rice cropping system with emphasis on soil incorporation date and BGM density. The nitrogen (N) contents of rye and barley, grass green manure crops, were 1.4~2.4% at early growth stage and decreased rapidly to 0.6~1.0% at late growth stage. The biomass of barley was 449 kg/l0a at heading stage (HS) and increased to 421 kg/10a at 10 days after heading stage (DAH), 473 kg/10a at 20 DAH. C/N ratio of BGM was the lowest 26.3 at HS. The N contents of BGM was in the range of 0.9~1.5%, the highest at HS and gradually decreased, and the output of N were 4.3-6.3 kg/10a. The total amount of nitrogen, phosphorous and potassium of BGM showed the highest level at 10 DAH. Culm length of rice was relatively longer as the BGM application time was delayed. The application of BGM into soil increased plant height of rice by 7.2~7.7 em as compared to the plants treated with commercial fertilizer at recommended rate. but panicle length of rice showed a similar tendency in both the soil-applied of BGM and commercial fertilizer. N contents of unhulled rice was the highest at HS of BGM and followed by 10 DAH of BGM and 20 DAH of BGM. This trend could also be seen in rice straw. The yield of rice in the soil-applied of BGM was 10~15% lower than in the soil-applied of commercial fertilizer. Based on this study, application of BGM made it possible to save 30~50% of application amount of nitrogen fertilizer for following crops.
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- 2011
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7. Yearly Variation of Ecological Traits of Weed Flora on Soils Having Different Drainage Property
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Eul-Soo Yun, Young-Dae Choi, Min-Hee Nam, Ki-Youl Jung, Chang-Young Park, Jae-Bok Hwang, and Yong-Hwan Lee
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education.field_of_study ,biology ,Ecology ,Population ,Galium spurium ,Nasturtium officinale ,Species diversity ,biology.organism_classification ,food.food ,Japonica ,Horticulture ,food ,Alopecurus aequalis ,Dominance (ecology) ,education ,Weed - Abstract
This survey of weed population by different soil moisture with paddy-upland rotation was conducted to investigate information on weed flora and its ecology between two years. Weed species were assessed in April : 2009, 2010. Soil samples were taken from each study plot to assess the impact soil moisture on the occurrence and abundance of dominance weed species. Soil water of poorly drained field ranged from 10.2~18.2% more than 11.8~14.3% of somewhat poorly drained field. Weeds of fields composed of 19 species belonging to 12 families. Among 12 families, 6 weed species belonged to Compositae (31.6%) were the biggest family, Cruciferae were 2 species (10.5%), and Rubiaceae were 2 species (10.5%), respectively. Youngia japonica had the highest summed dominance ratio(SDR) (97.0%) and followed by Conyza canadensis (92.1%), Galium spurium (35.3%) and Hemistepta lyrata (28.4%) of somewhat poorly drainage in 2009. Artemisia princeps the highest SDR (100%) and followed by Stellaria alsine(55.2%), Y. japonica (38.3%) and Nasturtium officinale (28.5%) of poorly drainage in 2009. And, Stellaria alsine had the highest SDR (86.8%) and followed by Alopecurus aequalis (77.7%), Astragalus sinicus (68.7%) and Y. japonica (46.3%) of somewhat poorly drainage in 2010. S. alsine the highest SDR (93.7%) and followed by A. aequalis (78.6%), Nasturtium officinale (31.3%) and Y. japonica (30.4%) of poorly drainage in 2010. Simpson`s index was calculated to 0.12~0.23, which showed that weed occurrence with different soil moisture in paddy-upland rotation and between years was various. Similarity coefficient between years was 43.0% (2009) and 74.2% (2010), which indicate a low diversity because of the moisture in the agro-ecosystem.
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- 2011
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8. Leeia oryzae gen. nov., sp. nov., isolated from a rice field in Korea
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Dong-Jin Park, Chang-Young Park, Gye Suk Lee, Ui-Gum Kang, Jee-Min Lim, Che Ok Jeon, and Chang-Jin Kim
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DNA, Bacterial ,Sequence analysis ,Molecular Sequence Data ,DNA, Ribosomal ,Microbiology ,Phylogenetics ,Genus ,RNA, Ribosomal, 16S ,Sequence Homology, Nucleic Acid ,Botany ,Phylogeny ,Soil Microbiology ,Ecology, Evolution, Behavior and Systematics ,Betaproteobacteria ,Spores, Bacterial ,Genetics ,Base Composition ,Korea ,biology ,Phylogenetic tree ,Fatty Acids ,Quinones ,Genes, rRNA ,Oryza ,Sequence Analysis, DNA ,General Medicine ,Ribosomal RNA ,16S ribosomal RNA ,biology.organism_classification ,Aerobiosis ,RNA, Bacterial ,Type species ,Locomotion - Abstract
A strictly aerobic, non-spore-forming, Gram-negative bacterium, designated strain HW7T, was isolated from a rice field in Korea. Cells of strain HW7T were short rod-shaped and motile with single polar flagella. The major cellular fatty acids of strain HW7T were C16 : 0 and summed feature 3 (C16 : 1 ω7c and/or iso-C15 : 0 2-OH). The genomic DNA G+C content was 56 mol% and the major isoprenoid quinone was Q-8. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain HW7T forms a distinct lineage with respect to closely related genera within the class Betaproteobacteria and that the levels of 16S rRNA gene sequence similarity with respect to the type species of related genera are less than 93 %. On the basis of the physiological and phylogenetic data, strain HW7T represents a novel genus and species of the Betaproteobacteria, for which the name Leeia oryzae gen. nov., sp. nov. is proposed. The type strain is HW7T (=KCTC 12585T=DSM 17879T).
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- 2007
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9. Insulin resistance and C-reactive protein as independent risk factors for non-alcoholic fatty liver disease in non-obese Asian men
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Yong Kyun Cho, Eun-Jung Rhee, Seung Ha Park, Dong Il Park, Won Young Lee, Sun Woo Kim, Byung Ik Kim, Jung Won Yun, In Kyung Sung, Woo Kyu Jeon, Chong Il Sohn, Hyang Kim, Chang Young Park, and Jeong Wook Kim
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Adult ,Male ,medicine.medical_specialty ,Apolipoprotein B ,medicine.medical_treatment ,Models, Biological ,chemistry.chemical_compound ,High-density lipoprotein ,Insulin resistance ,Asian People ,Risk Factors ,Diabetes mellitus ,Internal medicine ,Confidence Intervals ,Odds Ratio ,Homeostasis ,Humans ,Medicine ,Risk factor ,Hepatology ,biology ,business.industry ,Insulin ,C-reactive protein ,Fatty liver ,Gastroenterology ,nutritional and metabolic diseases ,medicine.disease ,Fatty Liver ,C-Reactive Protein ,Cross-Sectional Studies ,Endocrinology ,chemistry ,Case-Control Studies ,Multivariate Analysis ,biology.protein ,Insulin Resistance ,business - Abstract
Background and Aim: Although insulin resistance is often considered the link between obesity and non-alcoholic fatty liver disease (NAFLD), the role of insulin resistance, independent of obesity, as a NAFLD risk factor in non-obese men has been less well established. Systemic inflammation may be accompanied by insulin resistance in healthy subjects. The goal of the present study was to examine if insulin resistance and systemic inflammatory markers are independent predictors of NAFLD in non-obese men. Methods: The authors conducted a cross-sectional survey of 120 patients with NAFLD and 240 controls matched by age and body mass index. Controls had no evidence of alcohol abuse, hepatitis B or C, obesity, or previous history of diabetes, fasting hyperglycemia or hypertension. Diagnosis of NAFLD was based on an elevated alanine aminotransferase level and sonographic evidence of a fatty liver. Insulin resistance was determined using a homeostasis model assessment (HOMA-IR). Results: The age-adjusted risk of developing NAFLD was strongly associated with the elevated levels in measurements of uric acid, fasting blood sugar, triglycerides, apolipoprotein B, C-reactive protein (CRP) and HOMA-IR, and decreased levels of high density lipoprotein cholesterol and apolipoprotein A-I. Multivariate analysis based on univariate analysis indicated that an increase in CRP (odds ratio [OR] = 1.37; 95% confidence interval [CI]: 1.06–1.77) per 1 SD (1.48 mg/L) and HOMA-IR (OR = 2.28; 95% CI: 1.67–3.11) per 1 SD (0.63) were independent risk factors for NAFLD. Conclusion: Insulin resistance and systemic inflammatory response are of key importance for inducing NAFLD, particularly in apparently healthy non-obese men.
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- 2004
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10. New Serological Assay for Detection of Putative Helicobacter pylori Virulence Factors
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Yong-Kyun Cho, Tadashi Kodama, David Y. Graham, Hala M.T. El-Zimaity, Yoshio Yamaoka, Chang-Young Park, and Michael S. Osato
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Microbiology (medical) ,Helicobacter pylori infection ,Virulence Factors ,Spirillaceae ,Immunoblotting ,Virulence ,Sensitivity and Specificity ,Helicobacter Infections ,Microbiology ,Bacterial Proteins ,Predictive Value of Tests ,Humans ,Immunoblot Assay ,CagA ,Antigens, Bacterial ,Helicobacter pylori ,biology ,Serological assay ,Antibodies, Monoclonal ,Bacteriology ,bacterial infections and mycoses ,biology.organism_classification ,Serum samples ,Antibodies, Bacterial ,Virology ,digestive system diseases ,bacteria - Abstract
We evaluated a new immunoblot assay (Helicoblot 2.1) for Helicobacter pylori infection and CagA and VacA status by using serum samples from 222 patients. The test accurately detected H. pylori infection and VacA status, but improvements in the interpretation criteria are required before it can be recommended for determination of CagA status.
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- 2002
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11. Preferential loss of 5q14-21 in intestinal-type gastric cancer with DNA aneuploidy
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Gu Kong, Hideki Izumi, Atsunori Oga, Chang Young Park, Yuriko Ishii, and Kohsuke Sasaki
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Adult ,Male ,Biophysics ,Biology ,DNA sequencing ,Pathology and Forensic Medicine ,chemistry.chemical_compound ,Endocrinology ,Stomach Neoplasms ,Chromosome instability ,medicine ,Humans ,Gene ,Aged ,Image Cytometry ,Lasers ,Nucleic Acid Hybridization ,Cancer ,DNA, Neoplasm ,Cell Biology ,Hematology ,Middle Aged ,Aneuploidy ,medicine.disease ,Molecular biology ,chemistry ,Chromosomes, Human, Pair 5 ,Female ,Chromosome Deletion ,Ploidy ,Cytometry ,DNA ,Comparative genomic hybridization - Abstract
BACKGROUND Little is known about the genetic changes associated with DNA ploidy in gastric cancer (GC). The aim of this study was to identify recurrent or specific chromosomal regions of DNA sequence copy number aberrations (DSCNAs) that might harbor genes associated with DNA aneuploidy in GC. METHODS We analyzed DSCNAs with comparative genomic hybridization and DNA ploidy by laser scanning cytometry in 16 primary intestinal-type GCs. RESULTS All GCs examined showed at least one DSCNA (loss or gain); eight were DNA diploid (DD) tumors and eight were DNA aneuploid (DA) tumors. The frequent (>30%) DSCNAs were loss of 5q14-21 and gains of 7p11-14, 8q, 20q, and Xq25-26. Recurrent amplifications (>10%) were detected at chromosomal regions 6p, 7p, and 13q. The overall number of DSCNAs was significantly greater in DA than in DD tumors (P = 0.006). Furthermore, the number of aberrations was clearly greater with 5q loss than without 5q loss (P = 0.002). Losses of 5q14-21, 9p21-pter, 16q, and 18q21-qter were preferentially detected in DA tumors. CONCLUSION The present observations indicate that there is a close relationship between DSCNA and DNA ploidy in intestinal-type GC and that gene(s) at 5q14-21, 9p21-pter, 16q, and/or 18q21-qter may play important roles in acquisition of DNA aneuploidy. Cytometry (Comm. Clin. Cytometry) 46:57–62, 2001. © 2001 Wiley-Liss, Inc.
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- 2001
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12. Active DNA gels
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Deborah Kuchnir Fygenson, Omar A. Saleh, Chang Young Park, and Olivier J. N. Bertrand
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Motor protein ,chemistry.chemical_compound ,medicine.anatomical_structure ,chemistry ,Cell ,medicine ,macromolecular substances ,Biology ,Cytoskeleton ,DNA ,Cell biology - Abstract
Research into the mechanics and fluctuations of living cells has revealed the key role played by the cytoskeleton, a gel of stiff filaments driven out of equilibrium by force-generating motor proteins. Inspired by the extraordinary mechanical functions that the cytoskeleton imparts to the cell, we sought to create an artificial gel with similar characteristics. We identified DNA, and DNA-based motor proteins, as functional counterparts to the constituents of the cytoskeleton. We used DNA selfassembly to create a gel, and characterized its fluctuations and mechanics both before and after activation by the motor. We found that certain aspects of the DNA gel quantitatively match those of cytoskeletal networks, indicating the universal features of motor-driven, non-equilibrium networks.
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- 2013
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13. Comparison of 7-day and 14-day proton pump inhibitor-containing triple therapy for Helicobacter pylori eradication: neither treatment duration provides acceptable eradication rate in Korea
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Byeong Gwan Kim, Dong Ho Lee, Byong Duk Ye, Kwang Hyuck Lee, Beung Wook Kim, Sang Gyun Kim, Sang Woo Kim, Sung Kook Kim, Jae J. Kim, Hak Yang Kim, Jong Jae Park, Chang Young Park, Gwang Ho Baik, Yong Chan Lee, Jun Haeng Lee, Jin Hyug Lee, Hoon Jai Chun, Ki Baik Hahm, Su Jin Hong, Sang Woo Lee, and Hyun Chae Jung
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,medicine.drug_class ,Treatment duration ,Proton-pump inhibitor ,Gastroenterology ,Drug Administration Schedule ,Helicobacter Infections ,Internal medicine ,Clarithromycin ,medicine ,Humans ,Aged ,Aged, 80 and over ,Korea ,biology ,Helicobacter pylori ,business.industry ,Amoxicillin ,Proton Pump Inhibitors ,General Medicine ,Middle Aged ,Proton Pumps ,biology.organism_classification ,Anti-Bacterial Agents ,Infectious Diseases ,Treatment Outcome ,Drug Therapy, Combination ,Female ,business ,Omeprazole - Abstract
Although triple combination therapy containing a proton pump inhibitor (PPI) and two antibiotics is considered as a standard regimen for the first-line anti-Helicobacter pylori treatment, there are still debates on the ideal duration of treatment. The aim of this study was to compare the efficacies of 7-day and 14-day PPI-containing triple therapy.This study was performed in a randomized, multicenter, prospective manner. After upper gastrointestinal endoscopy, H. pylori-infected patients with a gastric ulcer and/or a duodenal ulcer were randomly assigned to a PAC7 group (omeprazole 20 mg or equivalent dose of other PPIs, amoxicillin 1000 mg, and clarithromycin 500 mg twice daily for 7 days) or to a PAC14 group (the same regimen as the PAC7 group but for 14 days). H. pylori status was evaluated by (13)C urea breath test 5 weeks after anti-ulcer treatment completion.A total of 598 patients were enrolled; 337 were randomized to the PAC7 group and 261 to the PAC14 group. The two groups were comparable in terms of baseline characteristics. The eradication rates of the PAC7 group were not inferior to those of the PAC14 group in both intention-to-treat analysis (71.2% vs. 75.5%) and per-protocol analysis (83.6% vs. 86.6%). Incidences of adverse events were comparable.Although the 7-day PPI-containing triple anti-H. pylori therapy is not inferior to the 14-day therapy, neither treatment duration provides acceptable eradication rate reaching 90% in per-protocol analysis. New combination regimen with higher efficacy should be developed as a first-line eradication therapy for H. pylori in Korea.
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- 2007
14. Comparison of genotyping Helicobacter pylori directly from biopsy specimens and genotyping from bacterial cultures
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David Y. Graham, Oscar Gutierrez, Minjung Kwak, Yoshio Yamaoka, and Chang-Young Park
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Microbiology (medical) ,DNA, Bacterial ,Microbiological culture ,Genotype ,Biopsy ,Polymerase Chain Reaction ,law.invention ,Bacterial genetics ,Microbiology ,Helicobacter Infections ,Bacterial Proteins ,law ,medicine ,CagA ,Humans ,Genotyping ,Polymerase chain reaction ,Antigens, Bacterial ,biology ,medicine.diagnostic_test ,Helicobacter pylori ,Stomach ,Bacteriology ,biology.organism_classification ,bacterial infections and mycoses ,Virology ,digestive system diseases ,Bacterial Typing Techniques ,Culture Media - Abstract
PCR for vacA and cagA genotypes of Helicobacter pylori using DNA isolated from infected gastric biopsy specimens was approximately equal to genotyping using bacterial DNA from cultures. Inconsistent results were associated with low H. pylori density in biopsies. A higher proportion of mixed infection was found when biopsies were used.
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- 2003
15. Is genotyping Helicobacter pylori directly from biopsy specimens and bacterial cultures comparable?
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Chang-Young Park, Yoshio Yamaoka, David Y. Graham, Oscar Gutierrez, and Minjung Kwak
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Microbiological culture ,Hepatology ,medicine.diagnostic_test ,biology ,business.industry ,Biopsy ,Gastroenterology ,medicine ,Helicobacter pylori ,biology.organism_classification ,business ,Genotyping ,Microbiology - Published
- 2003
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