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the production of a zone of greenish discoloration surrounding a bacterial colony on blood-agar medium, caused by partial decomposition of the hemoglobin of the erythrocytes; it is characteristic of pneumococci and certain streptococci.Medical dictionary. 2011.
alpha hemolysis — noun : a greenish discoloration and partial hemolysis of the red blood cells immediately surrounding colonies of certain streptococci on blood agar plates … Useful english dictionary
alpha hemolysis — A greenish zone of partial clearing around a bacterial colony growing on blood agar … 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
alpha hemolysin — 1. a hemolysin producing alpha hemolysis. 2. the hemolysin of the alpha toxin of Staphylococcus aureus, which hemolyzes rabbit, sheep, cow, and goat but not human erythrocytes. See also staphylococcal toxin, under toxin … Medical dictionary
Alpha toxin — or alpha toxin refers to several different protein toxins produced by bacteria. Alpha toxin may be:*Staphylococcus aureus alpha toxin, a membrane disrupting toxin that creates pores causing hemolysis and tissue damage. *Clostridium perfringens… … Wikipedia
beta hemolysis — n a sharply defined clear colorless zone of hemolysis surrounding colonies of certain streptococci on blood agar plates compare ALPHA HEMOLYSIS * * * the production of a clear zone immediately surrounding a bacterial colony on blood agar medium,… … Medical dictionary
Staphylococcus aureus alpha toxin — Alpha Toxin is secreted by Staph. aureus bacteria. It is a membrane disrupting toxin that creates pores causing hemolysis and tissue damage. It has phospholipase C activity.ee also*Phospholipase C *Peripheral membrane proteinsExternal links*… … Wikipedia
Streptococcus — Not to be confused with Staphylococcus. Streptococcus Scientific classification Kingdom: Bacteria Phylum … Wikipedia
