Post-pH effect in oral streptococci
| Autor: | A. Hermoso, J. Liébana, Ana Castillo, S. Rubiano, José Gutiérrez |
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| Rok vydání: | 2001 |
| Předmět: |
Microbiology (medical)
Microbiological culture Dental Plaque alkalinity Bacterial growth medicine.disease_cause Microbiology Colony-Forming Units Assay medicine Humans bacteria Alert system oral ecology biology Strain (chemistry) cariogenicity Streptococcus Acidity General Medicine Carbon Dioxide Hydrogen-Ion Concentration biology.organism_classification Streptococcaceae Infectious Diseases Oral ecology Bacteria |
| Zdroj: | Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases. 6(3) |
| ISSN: | 1198-743X |
| Popis: | Objective To study the post-pH effect (PpHE) in 11 strains of oral streptococci belonging to Streptococcus sanguis, S. mitis, S. gordonii, S. mutans and S. sobrinus by using the BacT/Alert microbial detection system. Methods The bacterial cultures were exposed to a different pH (3.6, 4.0, 4.6, 5.0, 5.6, 7.0, 7.5, 8.0 and 8.6) for 1 h, and then returned to a neutral medium. The automated BacT/Alert system determined resumed microbial growth by measuring CO 2 generation. The PpHE expresses the time difference between resumed growth (after pH shock) and optimal growth (pH 7.0 used as the control). Results PpHE was found to be minimal for alkaline pH values, and to be strain and species dependent. Conclusions The PpHE may be useful as an ecological determinant or as an indicator of the cariogenicity of oral streptococci. |
| Databáze: | OpenAIRE |
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