Meiring, H.D.

protein variant expression pneumococcal phenotypic variants pneumoniae sequence streptococcus pneumoniae phenotypic colony morphology analysis colony strain amount electrophoresis variation streptococcu proteinase maturation protein phenotype surface difference maturation pneumococci phase tigr pneumococcal genome pyruvate oxidase morphology weiser immun level pyruvate nasopharynx blot analysis proteinase peptide protein electrophoresis oxidase mass spectrometry protein 3 production acid sequences identification paracasei protein gel electrophoresis elongation factor ts quantity buffer product p 314 number phase variation pneumococcal variants ability method bacteria result culture assay hydrogen peroxide serine hydrogen control spectrometry virulence infection receptor protease colonization laboratory peroxide microbiol genome model expression levels opacity pneumococcal strains lactic acid bacteria tryptic digestion products nasopharyngeal colonization broth