beta hemolysis

beta hemolysis
beta hemolysis n a sharply defined clear colorless zone of hemolysis surrounding colonies of certain streptococci on blood agar plates compare ALPHA HEMOLYSIS

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the production of a clear zone immediately surrounding a bacterial colony on blood-agar medium, which is characteristic of certain pathogenic bacteria.

Medical dictionary. 2011.

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  • beta hemolysis — noun Etymology: beta (II) : a sharply defined clear colorless zone of hemolysis surrounding colonies of certain streptococci on blood agar plates …   Useful english dictionary

  • beta hemolysis — A zone of complete clearing around a bacterial colony growing on blood agar. The zone does not change significantly in color …   Dictionary of microbiology

  • Hemolysis (microbiology) — Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms. This is a particularly useful in classifying streptococcal species. A… …   Wikipedia

  • Hemolysis — (or haemolysis) from the Greek Hemo , Greek Polytonic|Αἷμα meaning blood, lysis, meaning to break open is the breaking open of red blood cells and the release of hemoglobin into the surrounding fluid (plasma, in vivo ). In vivo hemolysis In vivo… …   Wikipedia

  • Hemolysis — The destruction of red blood cells which leads to the release of hemoglobin from within the red blood cells into the blood plasma. Etymology: The word hemolysis is made up of hemo , blood + lysis , the disintegration of cells. * * * Alteration,… …   Medical dictionary

  • beta-hemolytic — be·ta he·mo·lyt·ic or chiefly Brit be·ta hae·mo·lyt·ic .bāt ə .hē mə lit ik, chiefly Brit .bē tə adj capable of causing beta hemolysis <beta hemolytic streptococci> …   Medical dictionary

  • beta hemolysin — 1. a hemolysin that produces beta hemolysis. 2. the hemolysin of the beta toxin of Staphylococcus aureus; it is a sphingomyelinase that lyses human and sheep erythrocytes in the cold following a warm incubation. See also staphylococcal toxin,… …   Medical dictionary

  • beta — Second letter of the Greek alphabet, β (see entry at start of letter “B s.” [G.] * * * Biomedical Electronics Technicians Association * * * be·ta bāt ə, chiefly Brit bē tə n 1) the second letter of the Greek alphabet symbol ß or ß 2) BETA… …   Medical dictionary

  • alpha hemolysis — n a greenish discoloration and partial hemolysis of the red blood cells immediately surrounding colonies of some streptococci on blood agar plates compare BETA HEMOLYSIS * * * the production of a zone of greenish discoloration surrounding a… …   Medical dictionary

  • Streptococcus — Not to be confused with Staphylococcus. Streptococcus Scientific classification Kingdom: Bacteria Phylum …   Wikipedia

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