• Title, Summary, Keyword: Polymerase Chain Reaction

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Analysis of Lactobacillus casei and Mutant Strains by Polymerase Chain Reaction (Polymerase Chain Reaction에 의한 Lactobacillus casei 및 돌연변이 균주들의 비교 분석)

  • Nam, Jin-Sik;Lee, Jeong-Jun;Shin, Myeong-Su;Na, Seog-Hwan;Baek, Young-Jin;Yoo, Min
    • Microbiology and Biotechnology Letters
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    • v.22 no.6
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    • pp.577-583
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    • 1994
  • To classify Lactobacillus casei strains on the basis of difference in their chromosomal DNA sequence, we have performed polymerase chain reactions on their chromosomal DNA by using random primers, and followed by analyzing randomly amplified polymorphic DNA fragments. We also developed a mini-preparative method to isolate PCR-grade chromosomal DNA from Lacto- bacillus casei strains within 3 hours. Based on RAPD pattems by polymerase chain reactions with degenerated random primers, 4 Lactobacillus casei strains and 2 mutant strains were successfully discriminated. Results were very sensitive, strain-specific and reproducible. It was also reliable. These results suggest that RAPD may be applied efficiently for the identification of several Lactoba- cillus casei strains.

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Genetic Similarity and Diversity in Crucian Carp(Carassius carassius) Populations by Polymerase Chain Reaction-Random Amplified Polymorphic DNAs

  • Yoon, Jong-Man;Kim, Tae-Sun;Kim, Jong-Yeon
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.332-333
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    • 2001
  • Genomic DNA was extracted from the blood of the freshwater crucian carp(Carassius carassius) from Kunsan in Korea, representing genetic similarity by polymerase chain reaction amplification of DNA as twelve of arbitrary primers. The electrophoretic analysis of polymerase chain reaction-random amplified polymorphic DNAs(PCR-RADP) products showed the high levels of similarity between different individuals in crucian carp.

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Comparison of quantitative detection of periodontal pathogens before and after scaling by real-time polymerase chain reaction

  • Kim, Young-Sun;Lee, Jung-Hwa;Lee, Young-Eun
    • Journal of Korean society of Dental Hygiene
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    • v.15 no.6
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    • pp.1063-1071
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    • 2015
  • Objectives: The purpose of the study is to investigate the quantitative detection of periodontal pathogens before and after scaling by real-time polymerase chain reaction. Methods: Participants were voluntarily recruited at D university, and saliva samples were extracted before and after scaling. Multiple real-time polymerase chain reactions were used to analyze characteristics and the amount of nine kinds of periodontal pathogens; Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola, Prevotella intermedia, Fusobacterium nucleatum, Parvimonas micra, Campylobacter rectus, and Eikenella corrodens. Results: After scaling, most periodontal pathogens except Eikenella corrodens were significantly decreased in all subjects(p<0.05). In addition, the percentage of microorganisms associated with disease, the microorganism risk index of periodontitis and the prevalence of red complex, orange complex, and Aggregatibacter actinomycetemcomitans was also significantly reduced after scaling(p<0.05). Conclusions: Scaling decreased in the amount of major periodontal pathogens and periodontitis prevalence rate.

Use of Molecular Replacement to Determine the Phases of Crystal Structure of Taq DNA Polymerase

  • Kim, Young-Soo;Suh, Se-Won
    • BMB Reports
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    • v.29 no.1
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    • pp.38-44
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    • 1996
  • Taq DNA polymerase from Thermus aquaticus has been shown to be very useful in the polymerase chain reaction method, which is being used for amplifying DNA. Not only does Taq DNA polymerase have high commercial value commercial value for the polymerase chain reaction application, but it is also important in studying DNA replication, because it is apparently an homologue to E. coli DNA polymerase I, which has long been used for DNA replication study (Lawyer et ai., 1993). The crystal structure determination of Taq DNA polymerase was initiated. An X-ray diffraction pattern breaks down a crystal structure into discrete sine waves in a Fourier series. The original shape of a crystal object in terms of electron density may be represented as the sum of those sine waves with varying amplitudes and phases in three dimensions. The molecular replacement method was initially employed to provide phase information for the structure of Taq DNA polymerase. The rotation search using the program MERLOT resulted in a solution peak with 5.4 r.m.s. PC-refinement of the X-PLOR program verified the result and also optimized the orientation angles. Next, the translation search using the X-PLOR program resulted in a unique solution peak with 7.35 r.m.s. In addition, the translation search indicated $P3_121$ to be the true space group out of two possible ones. The phase information from the molecular replacement was useful in the MIR phasing experiment.

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Detection of Extended-Spectrum β-Lactamase Producing Klebsiella pneumoniae by Multiplex Polymerase Chain Reaction (Multiplex Polymerase Chain Reaction을 이용한 Extended-Spectrum β-Lactamase 생성 Klebsiella pneumoniae 균주의 검출)

  • Yang, Byoung-Seon
    • Korean Journal of Clinical Laboratory Science
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    • v.38 no.3
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    • pp.173-178
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    • 2006
  • The production of extended-spectrum ${\beta}$-lactamases ($ESBL_S$) is the main mechanism of bacterial resistance to third-generation cephalosporins and monobactams, whose prevalence varies depending on the different geographical areas. In the last years it has increased notably to the point of being considered a health problem of great importance. The characterization of the ESBLs producing Klebsiella penumoniae strains present in clinical isolates is time-consuming. I describe here the development of a new system, which consists of a multiplex PCR. I found 51 K. pneumoniae strains to be presumptive strains ESBLs producers by clinical and laboratory standards institute (CLSI) guidelines. The double disc synergy test showed 47 positive K. pneumoniae, which were K. pneumoniae isolates. All ESBLs producing K. pneumoniae strains were resistant to antibiotic amikacin, gentamicin and ciprofloxacin. By multiplex PCR analysis, $bla_{TEM}$ gene in 17 strains 44 $bla_{SHV}$ genes and $bla_{CTX}$ genes in 33 strains were identified. In this study, the multiplex polymerase chain reaction (PCR) assay was a good method to detect and differentiate ESBLs producing K. penumoniae strains in clinical isolates.

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Production of DNA polymerase from Thermus aquaticus in recombinant Escherichia coli

  • Kim, Sung-Gun;Park, Jong-Tae
    • Korean Journal of Agricultural Science
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    • v.41 no.3
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    • pp.245-249
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    • 2014
  • Among dozens of DNA polymerases cloned from thermophilic bacteria, Taq DNA polymerase from Thermus aquaticus has been most frequently used in polymerase chain reaction (PCR) that is being applied to gene cloning, DNA sequencing, gene expression analysis, and detection of infectious and genetic diseases. Since native Taq DNA polymerase is expressed at low level in T. aquaticus, recombinant Escherichia coli system was used to produce Taq DNA polymerase in a large amount. Taq DNA polymerase was expressed as a soluble form under the control of tac promoter in E. coli, and purified by heat treatment and ion exchange chromatographies. The purified Taq DNA polymerase was nearly homogeneous and exhibited a similar DNA amplification activity with a commercial Taq DNA polymerase.

Detection and Epidemiological Survey of Canine Parvoviral Enteritis by Polymerase Chain Reaction (Polymerase Chain Reaction을 이용한 Canine Parvovirus성장염의 진단과 역학조사)

  • Kim, Doo;Jang, Wook
    • Journal of Veterinary Clinics
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    • v.14 no.2
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    • pp.177-184
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    • 1997
  • Canine parvovirus(CPV) is a very highly contagious virus causing hemorrhagic enteritis and myocarditis mainly in young dogs. The diseases were first recognized in 1978, and then spread throughout the world by 1980. The main source of the infection seems to be the feces of infected dogs, at the same time feces are suitable materials for detection of virus in the enteric form exactly for the same reasons. Recently, a new technique of in vitro DNA amplification, Known as the polymerase chain reaction (PCR), has been widely applied to clinical viral diagnosis because of its sensitivity, specificity and rapidity. In this research, we attemped to set up the PCR for the detection of CPV in fecal samples and conformed the canine parvpviral enteritis by PCR. To increase the sensitivity and specificity of a PCR, the nested PCR (two-step PCR) was performed. We also surveyed the contamination status of CPV in the research using fecal specimen was highly sensitive and specific. Of the 100 fecal specimens suspected canine parvoviral enteritis, 45 fecal specimens were positive in HA test, 64 fecal specimens were positive in the first PCR, and 87 fecal specimens were positive in the second PCR. CPV contamination status of animal clinics and breeding centers was serious, wo hygienic management of environment in which dogs are reared is required. The nested PCR described here seems to be a rapid, sensitive and specific for the detection of canine parvovirus.

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Miniaturization of Polymerase Chain Reaction

  • Lee, Ji-Youn;Kim, Jae-Jeong;Park, Tai-Hyun
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.8 no.4
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    • pp.213-220
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    • 2003
  • Polymerase chain reaction (PCR) is one of the most widely used analytical tool and is an important module that would benefit from being miniaturized and integrated onto diagnostic or analytical chips. There are potentially two different approaches for the miniaturization of the PCR module: chamber-type and flow-type micro-PCR. These miniaturized PCRs have distinct characteristics and advantages. In this article, we review the necessity of micro-PCR, the materials for the chip fabrication, the surface modification, and characteristics of the two types of micro-PCR. The motivation underlying the development of micro-PCR, the advantages and disadvantages of the various materials used in fabrication and the surface modification methods will be discussed. And finally, the precise features of the two different types of micro-PCR will be compared.

Detection of Coliform and Escherichia coli in Spring Water by Polymerase Chain Reaction (PCR법을 이용한 옹달샘물의 대장균군 및 대장균 검출)

  • 류승희;박석기
    • Journal of Environmental Health Sciences
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    • v.28 no.2
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    • pp.193-202
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    • 2002
  • The polymerase chain reaction(PCR) of target lacZ and uidA genes were used to detect total coliform and Escherichia coli for determining water quality, respectively. Of 109 spring waters, coliform were detected from 38 spring waters by lacZ PCR method but 21 spring waters by culture method accepted by the Ministry of Environment for water quality monitoring. The lacz PCR method gave the results statistically equivalent to those of the culture method(kappa=0.62, McNemar=17.00). The uidA PCR method gave the same results to those of the culture method. The sensitivity and specificity of coliform and E. coli by PCR method were 100% and 80.7%, respectively. Therefore, PCR can be used for the rapid identification of Escherichia coli and coliform in potable water using uidA and lacZ.