title: [Scanning electron microscope observation of morphological influence P-aminobenzoic acid (PABA) on Porphyromonas gingivalis].
abstract: OBJECTIVE
  In order to investigate the effect of PABA produced by Streptococcus sanguis on microecological balance of subgingival plaque, different concentrations of PABA were applied to see if it can influence the form and adherence of P. gingivalis.
  
  
  METHODS
  After adding different concentrations of PABA into 1/2 concentration of BHI media, an anaerobic technique was used to culture P. gingivalis. P. gingivalis grew in the medium was observed by a scanning electron microscope.
  
  
  RESULTS
  Excessively high or low PABA concentration could influence the form and adherence of P. gingivalis.
  
  
  CONCLUSIONS
  PABA produced by Streptococcus sanguis can affect the form and adherence of P. gingivalis. It indicates that Streptococcus sanguis plays regulative effect on the microecological balance of subgingival plaques.
mesh_terms: D010129:4-Aminobenzoic Acid / Q000494:pharmacology*; D001422:Bacterial Adhesion / Q000187:drug effects; D003773:Dental Plaque / Q000382:microbiology; D006801:Humans; D008855:Microscopy, Electron, Scanning; D016966:Porphyromonas gingivalis / Q000187:drug effects / Q000648:ultrastructure*; D013298:Streptococcus sanguis / Q000502:physiology*
chemical_list: D010129:4-Aminobenzoic Acid