Streptococcus Mutans Ua159
Mostrando 25-36 de 40 artigos, teses e dissertações.
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25. Avaliação do potencial anticarie da propolis proveniente da região de mata atlantica da Bahia
Uma nova variedade de própolis, classificada como tipo 6, embora não apresente flavonóides em sua composição química, tem demonstrado atividade antimicrobiana e anti-glucosiltransferase in vitro. O objetivo deste estudo foi avaliar os efeitos anticárie e a composição química da propolis tipo 6 (EEP) e de sua fração hexano (EEH), aIém de duas sub
Publicado em: 2005
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26. Analysis of an Agmatine Deiminase Gene Cluster in Streptococcus mutans UA159
An operon encoding enzymes of the agmatine deiminase system (AgDS) has been identified in the cariogenic bacterium Streptococcus mutans UA159. The AgDS is regulated by agmatine induction and carbohydrate catabolite repression. Ammonia is produced from agmatine at low pH, suggesting that the AgDS could augment acid tolerance.
American Society for Microbiology.
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27. Streptococcus mutans Competence-Stimulating Peptide Inhibits Candida albicans Hypha Formation ▿
The oral cavity is colonized by microorganisms growing in biofilms in which interspecies interactions take place. Streptococcus mutans grows in biofilms on enamel surfaces and is considered one of the main etiological agents of human dental caries. Candida albicans is also commonly found in the human oral cavity, where it interacts with S. mutans. C. albican
American Society for Microbiology (ASM).
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28. Genome sequence of Streptococcus mutans UA159, a cariogenic dental pathogen
Streptococcus mutans is the leading cause of dental caries (tooth decay) worldwide and is considered to be the most cariogenic of all of the oral streptococci. The genome of S. mutans UA159, a serotype c strain, has been completely sequenced and is composed of 2,030,936 base pairs. It contains 1,963 ORFs, 63% of which have been assigned putative functions. T
National Academy of Sciences.
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29. Transformation of Streptococcus mutans with chromosomal and shuttle plasmid (pYA629) DNAs.
Transformation (i.e., DNase-sensitive genetic transfer) of strains of Streptococcus mutans representing serotypes c and e was accomplished by using chromosomal DNA from a Rifr Strr Spcr isolate of strain GS5 (UAB525) and a chimeric plasmid, pYA629. Shuttle plasmid pYA629 comprises the S. mutans plasmid pVA318, an inducible erythromycin resistance determinant
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30. The Specific Genes for Lantibiotic Mutacin II Biosynthesis in Streptococcus mutans T8 Are Clustered and Can Be Transferred En Bloc
Mutacin II is a ribosomally synthesized peptide lantibiotic produced by group II Streptococcus mutans. DNA sequencing has revealed that the mutacin II biosynthetic gene cluster consists of seven specific open reading frames: a regulator (mutR), the prepromutacin structural gene (mutA), a modifying protein (mutM), an ABC transporter (mutT), and an immunity cl
American Society for Microbiology.
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31. Characteristics and cariogenicity of a fructanase-defective Streptococcus mutants strain.
Polymers of D-fructose produced by a variety of oral bacteria are believed to function as extracellular carbohydrate reserves. Degradation of these polysaccharides in plaque following exhaustion of dietary carbohydrates is thought to contribute to the extent and duration of the acid challenge to the tooth surface and thus to the initiation and progression of
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32. Functional Genomics Approach to Identifying Genes Required for Biofilm Development by Streptococcus mutans
Streptococcus mutans, the primary etiological agent of human dental caries, is an obligate biofilm-forming bacterium. The goals of this study were to identify the gene(s) required for biofilm formation by this organism and to elucidate the role(s) that some of the known global regulators of gene expression play in controlling biofilm formation. In S. mutans
American Society for Microbiology.
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33. Galactose Metabolism by Streptococcus mutans
The galK gene, encoding galactokinase of the Leloir pathway, was insertionally inactivated in Streptococcus mutans UA159. The galK knockout strain displayed only marginal growth on galactose, but growth on glucose or lactose was not affected. In strain UA159, the sugar phosphotransferase system (PTS) for lactose and the PTS for galactose were induced by grow
American Society for Microbiology.
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34. Persistence of Streptococcus mutans in Stationary-Phase Batch Cultures and Biofilms†
Streptococcus mutans is a member of oral plaque biofilms and is considered the major etiological agent of dental caries. We have characterized the survival of S. mutans strain UA159 in both batch cultures and biofilms. Bacteria grown in batch cultures in a chemically defined medium, FMC, containing an excess of glucose or sucrose caused the pH to decrease to
American Society for Microbiology.
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35. uvrA Is an Acid-Inducible Gene Involved in the Adaptive Response to Low pH in Streptococcus mutans
The pH-inducible acid tolerance response (ATR) is believed to play a major role in acid adaptation and virulence of Streptococcus mutans. To study this phenomenon in S. mutans JH1005, differential display PCR was used to identify and clone 13 cDNA products that had increased expression in response to pH 5.0 compared to that of pH 7.5-grown cells. One of thes
American Society for Microbiology.
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36. Shifts in the Membrane Fatty Acid Profile of Streptococcus mutans Enhance Survival in Acidic Environments
Acid adaptation of Streptococcus mutans UA159 involves several different mechanisms, including the ability to alter its proportion of long-chain, monounsaturated membrane fatty acids (R. G. Quivey, Jr., R. Faustoferri, K. Monahan, and R. Marquis, FEMS Microbiol. Lett. 189:89-92, 2000). In the present study, we examined the mechanism and timing of changes in
American Society for Microbiology.