title: Role of potassium tellurite and brain heart infusion in expression of the hemolytic phenotype of Listeria spp. on agar plates.
abstract: The influence of potassium tellurite (PT) and brain heart infusion agar (Difco), two components of modified Listeria selective agar medium (LSAMm), on the hemolytic phenotype of Listeria spp. was studied. L. monocytogenes and L. ivanovii displayed bigger zones of hemolysis on brain heart intusion agar compared with on Columbia agar base. The addition of PT increased the sizes of zones of hemolysis displayed by L. monocytogenes. This effect seemed to be produced by the enhancement of the cytolytic effect of listeriolysin O. PT decreased the hemolysis produced by L. ivanovii, and this effect seemed to be due to an inhibition of the sphingomyelinase C produced by this species.
authors.affiliation: Departamento de Patología Animal I (Sanidad Animal), Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
authors.forename: J F
authors.initials: JF
authors.lastname: Fernandez-Garayzabal
authors.forename: C
authors.initials: C
authors.lastname: Delgado
authors.forename: M
authors.initials: M
authors.lastname: Blanco
authors.forename: J A
authors.initials: JA
authors.lastname: Vazquez-Boland
authors.forename: V
authors.initials: V
authors.lastname: Briones
authors.forename: G
authors.initials: G
authors.lastname: Suarez
authors.forename: L
authors.initials: L
authors.lastname: Dominguez
mesh_terms: D003470:Culture Media / Q000494:pharmacology; D006461:Hemolysis; D008087:Listeria / Q000187:drug effects / Q000378:metabolism*; D010641:Phenotype; D013691:Tellurium / Q000494:pharmacology*
chemical_list: D003470:Culture Media; C026899:potassium tellurate(IV); D013691:Tellurium