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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Population Dynamics of <italic>Streptococcus mitis</italic> in Its Natural Habitat</title><author><name sortKey="Hohwy, Jesper" sort="Hohwy, Jesper" uniqKey="Hohwy J" first="Jesper" last="Hohwy">Jesper Hohwy</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author><author><name sortKey="Reinholdt, Jesper" sort="Reinholdt, Jesper" uniqKey="Reinholdt J" first="Jesper" last="Reinholdt">Jesper Reinholdt</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author><author><name sortKey="Kilian, Mogens" sort="Kilian, Mogens" uniqKey="Kilian M" first="Mogens" last="Kilian">Mogens Kilian</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">11553543</idno><idno type="pmc">98734</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC98734</idno><idno type="RBID">PMC:98734</idno><idno type="doi">10.1128/IAI.69.10.6055-6063.2001</idno><date when="2001">2001</date><idno type="wicri:Area/Pmc/Corpus">000A18</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000A18</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Population Dynamics of <italic>Streptococcus mitis</italic> in Its Natural Habitat</title><author><name sortKey="Hohwy, Jesper" sort="Hohwy, Jesper" uniqKey="Hohwy J" first="Jesper" last="Hohwy">Jesper Hohwy</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author><author><name sortKey="Reinholdt, Jesper" sort="Reinholdt, Jesper" uniqKey="Reinholdt J" first="Jesper" last="Reinholdt">Jesper Reinholdt</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author><author><name sortKey="Kilian, Mogens" sort="Kilian, Mogens" uniqKey="Kilian M" first="Mogens" last="Kilian">Mogens Kilian</name><affiliation><nlm:aff id="N0x81463e0.0x9e0c3a0"></nlm:aff></affiliation></author></analytic><series><title level="j">Infection and Immunity</title><idno type="ISSN">0019-9567</idno><idno type="eISSN">1098-5522</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The purpose of this study was to examine the genetic structure of the typical commensal <italic>Streptococcus mitis</italic> biovar 1 in its natural habitat in the human oral cavity and pharynx and to investigate the role that selected microbial properties and host, spatial, and temporal factors play in determining the structure of the bacterial population. Consecutive samples were collected from buccal and pharyngeal mucosal surfaces of two infants, their four parents, and two elderly individuals over a period of approximately 1 year. A total of 751 isolates identified as <italic>S. mitis</italic> biovar 1 were typed by restriction endonuclease analysis (REA) and representative clones were typed by multilocus enzyme electrophoresis (MLEE). The genetic diversity of the <italic>S. mitis</italic> biovar 1 isolates collected from single infant hosts over a period of 9 to 10 months was found to be between 0.69 and 0.76, which is considerably higher than that previously observed for intestinal populations of <italic>Escherichia coli</italic>. The study provides evidence of the existence of both transient and persistent clones in adult individuals. In the two infants, however, none of 42 demonstrated clones were detected on more than a single occasion. Statistical calculations showed that the ability to persist was not distributed at random in the <italic>S. mitis</italic> biovar 1 population. However, neither immunoglobulin A1 protease activity nor the ability to bind α-amylase from saliva was a preferential characteristic of persistent genotypes. In contrast to current concepts of climax ecosystems, the species niche in the habitat appears to be maintained predominantly by a succession of clones rather than by stable strains. Several lines of evidence suggest that the major origin of “new” clones is the many other habitats in the respiratory tract that are occupied by this species.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Infect Immun</journal-id><journal-id journal-id-type="publisher-id">INFECT IMMUN</journal-id><journal-title>Infection and Immunity</journal-title><issn pub-type="ppub">0019-9567</issn><issn pub-type="epub">1098-5522</issn><publisher><publisher-name>American Society for Microbiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">11553543</article-id><article-id pub-id-type="pmc">98734</article-id><article-id pub-id-type="publisher-id">1696</article-id><article-id pub-id-type="doi">10.1128/IAI.69.10.6055-6063.2001</article-id><article-categories><subj-group subj-group-type="heading"><subject>Molecular Genomics</subject></subj-group></article-categories><title-group><article-title>Population Dynamics of <italic>Streptococcus mitis</italic> in Its Natural Habitat</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Hohwy</surname><given-names>Jesper</given-names></name><xref ref-type="aff" rid="N0x81463e0.0x9e0c3a0">1</xref><xref ref-type="aff" rid="N0x81463e0.0x9e0c3a0">2</xref></contrib><contrib contrib-type="author"><name><surname>Reinholdt</surname><given-names>Jesper</given-names></name><xref ref-type="aff" rid="N0x81463e0.0x9e0c3a0">2</xref></contrib><contrib contrib-type="author"><name><surname>Kilian</surname><given-names>Mogens</given-names></name><xref ref-type="aff" rid="N0x81463e0.0x9e0c3a0">1</xref><xref ref-type="author-notes" rid="FN150">*</xref></contrib></contrib-group><aff id="N0x81463e0.0x9e0c3a0"> Department of Medical Microbiology and Immunology<sup>1</sup> and Department of Oral Biology,<sup>2</sup> Faculty of Health Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark</aff><contrib-group><contrib contrib-type="editor"><name><surname>DiRita</surname><given-names>V. J.</given-names></name></contrib></contrib-group><author-notes><fn id="FN150"><label>*</label><p>Corresponding author. Mailing address: Department of Medical Microbiology and Immunology, Faculty of Health Sciences, The Bartholin Bldg., University of Aarhus, DK-8000 Aarhus C, Denmark. Phone: 45 8942 1735. Fax: 45 8619 6128. E-mail: <email>kilian@microbiology.au.dk</email></p></fn></author-notes><pub-date pub-type="ppub"><month>10</month><year>2001</year></pub-date><volume>69</volume><issue>10</issue><fpage>6055</fpage><lpage>6063</lpage><history><date date-type="received"><day>9</day><month>11</month><year>2000</year></date><date date-type="rev-request"><day>17</day><month>4</month><year>2001</year></date><date date-type="accepted"><day>18</day><month>7</month><year>2001</year></date></history><copyright-statement>Copyright © 2001, American Society for Microbiology</copyright-statement><copyright-year>2001</copyright-year><abstract><p>The purpose of this study was to examine the genetic structure of the typical commensal <italic>Streptococcus mitis</italic> biovar 1 in its natural habitat in the human oral cavity and pharynx and to investigate the role that selected microbial properties and host, spatial, and temporal factors play in determining the structure of the bacterial population. Consecutive samples were collected from buccal and pharyngeal mucosal surfaces of two infants, their four parents, and two elderly individuals over a period of approximately 1 year. A total of 751 isolates identified as <italic>S. mitis</italic> biovar 1 were typed by restriction endonuclease analysis (REA) and representative clones were typed by multilocus enzyme electrophoresis (MLEE). The genetic diversity of the <italic>S. mitis</italic> biovar 1 isolates collected from single infant hosts over a period of 9 to 10 months was found to be between 0.69 and 0.76, which is considerably higher than that previously observed for intestinal populations of <italic>Escherichia coli</italic>. The study provides evidence of the existence of both transient and persistent clones in adult individuals. In the two infants, however, none of 42 demonstrated clones were detected on more than a single occasion. Statistical calculations showed that the ability to persist was not distributed at random in the <italic>S. mitis</italic> biovar 1 population. However, neither immunoglobulin A1 protease activity nor the ability to bind α-amylase from saliva was a preferential characteristic of persistent genotypes. In contrast to current concepts of climax ecosystems, the species niche in the habitat appears to be maintained predominantly by a succession of clones rather than by stable strains. Several lines of evidence suggest that the major origin of “new” clones is the many other habitats in the respiratory tract that are occupied by this species.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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