Genus of Gram positive cocci that grow in chains. Some species ( Strep. pyogenes in particular) are responsible for important diseases in humans (pharyngitis, scarlet fever, rheumatic fever) : Strep. pneumoniae is the main culprit in lobar- and broncho-pneumonia. Streptococci have anti-phagocytic components (hyaluronic acid-rich capsule and M-protein), and release various toxins (streptolysins O and S, erythrogenic toxin) and enzymes (streptokinase, streptodornase, hyaluronidase, and proteinase). a -haemolytic streptococci (viridans streptococci) produce limited haemolysis on blood agar; include S. mutans, S. salivarius, S. pneumoniae. b -haemolytic streptococci, of which S. pyogenes is the only species, though there are many serotypes, produce a broad zone of almost complete haemolysis on blood agar as a result of streptolysin O and S release. g -streptococci are non-haemolytic (eg. S. faecalis ).

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Streptococcus — pneumoniae Systematik Domäne: Bakterien Abteilung …   Deutsch Wikipedia

  • Streptococcus — ? Streptococcus Научная классификация Царство: Бактерии Тип: Класс: Bacilli …   Википедия

  • Streptococcus — género de cocos grampositivos inmóviles, clasificados por tipos serológicos (grupos de Lancefield de A a T), por su acción hemolítica (alfa, beta, gamma) cuando crecen en agar sangre y por su reacción a virus bacterianos (fagotipos 1 a 86).… …   Diccionario médico

  • streptococcus — [strep΄tə käk′əs] n. pl. streptococci [strep΄təkäk′sī΄] [ModL < Gr streptos, twisted (see STREPTOMYCES) + COCCUS] any of a genus (Streptococcus) of spherical, Gram positive bacteria that divide in only one plane and occur generally in chains:… …   English World dictionary

  • Streptococcus — Strep to*coc cus, n.; pl. {Streptococci}. [NL., fr. Gr. ? pliant, curved + ? a grain, seed.] (Biol.) A long or short chain of micrococci, more or less curved. [1913 Webster] [1913 Webster] [1913 Webster] …   The Collaborative International Dictionary of English

  • Streptococcus — См. Стрептококки (Источник: «Словарь терминов микробиологии») …   Словарь микробиологии

  • Streptococcus — Billroth, Gattung der Kugelbakterien, runde Zellen ohne Bewegungsorgane, die sich nur nach einer Richtung des Raumes teilen. Nach der Teilung bilden die Zellen, indem sie sich voneinander trennen, perlschnurartige Ketten. S. erysipelatos… …   Meyers Großes Konversations-Lexikon

  • Streptocóccus — Streptocóccus, runde Bakterienformen (Kokken, s. Kokkus), die sich ketten oder perlschnurartig aneinanderreihen (Kettenkokken [Tafel: Bakterien, 1]) …   Kleines Konversations-Lexikon

  • Streptococcus — vgl. Streptokokke …   Das Wörterbuch medizinischer Fachausdrücke

  • streptococcus — (n.) bacteria genus, 1877, Modern Latin, coined by Viennese surgeon Albert Theodor Billroth (1829 1894) from Gk. streptos twisted + Mod.L. coccus spherical bacterium, from Gk. kokkos berry. So called because the bacteria usually form chains …   Etymology dictionary

  • streptococcus — ► NOUN (pl. streptococci) ▪ a bacterium of a large genus including those causing scarlet fever, pneumonia, souring of milk, and dental decay. DERIVATIVES streptococcal adjective. ORIGIN from Greek streptos twisted …   English terms dictionary

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