title: Incidence of bacteriocinogeny among fresh isolates of Streptococcus mutans.
abstract: Among 139 Streptococcus mutans fresh isolates tested, using the deferred-antagonism test and Streptococcus sanguis Ny 101 as the indicator strain, we observed that the frequency of detection of inhibition zones was reduced by 19% (from 53 to 34%) when arginine (1%) was used in the overlay agar. Among pigmented strains, the frequency of mutacin-like production was 70%. The frequency with which inhibition zones were detected varied from 7 to 91%, depending on the indicator strain used. These results indicate that the ability to detect the presence of mutacin-like substances varies widely and is dependent to a great extent on the methodology used.
authors.affiliation: Groupe de recherche écologie buccale, Départment de biochimie et Ecologie de médecine dentaire, Université Laval, Quebec, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Parrot
authors.forename: M F
authors.initials: MF
authors.lastname: Dréan
authors.forename: L
authors.initials: L
authors.lastname: Trehan
authors.forename: M C
authors.initials: MC
authors.lastname: Lavoie
mesh_terms: D000328:Adult; D001120:Arginine / Q000378:metabolism; D001430:Bacteriocins / Q000096:biosynthesis*; D005189:False Positive Reactions; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009055:Mouth / Q000382:microbiology; D013295:Streptococcus mutans / Q000502:physiology*
chemical_list: D001430:Bacteriocins; D001120:Arginine