Actinomyces

A genus of slow-growing, nonmotile, nonsporeforming, anaerobic to facultatively anaerobic bacteria (family Actinomycetaceae) containing Gram-positive, irregularly staining filaments; diphtheroid cells may be predominant. They exhibit true branching while forming mycelial type colonies. Most of the species produce a filamentous microcolony. The metabolism of these chemoheterotrophs is fermentative; the products of glucose fermentation include acetic, formic, lactic, and succinic acid s but not propionic acid. A. may have characteristic sulfur granules in purulent drainage. These organisms are pathogenic for humans and other animals and can cause chronic suppurative infection in humans. Over 16 species have been described; type species is A. bovis. [actino- + G. mykes, fungus]
- A. bovis a species of bacteria causing actinomycosis in cattle; infection in humans is not established; it is the type species of its genus.
- A. israelii the most common species of a. causing human actinomycosis and, occasionally, infections in cattle.
- A. naeslundii a species whose natural habitat is the oral cavity; human infections occur and it produces periodontal destruction in some species of animals.
- A. odontolyticus a species whose normal habitat is the human oral cavity; it has been isolated from deep dental caries.
- A. viscosus a species that has been isolated from the oral cavity of humans and some species of other animals; it produces periodontal disease in animals and has been isolated from human dental calculus and root surface caries.

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ac·ti·no·my·ces .ak-tə-(.)nō-'mī-.sēz, ak-.tin-ō- n
1) cap a genus of filamentous or rod-shaped gram-positive bacteria of the family Actinomycetaceae that includes usu. commensal and sometimes pathogenic forms inhabiting mucosal surfaces esp. of the oral cavity compare ACTINOMYCOSIS
2) pl actinomyces a bacterium of the genus Actinomyces
ac·ti·no·my·ce·tal -.mī-'sēt-əl adj

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n.
a genus of Gram-positive nonmotile fungus-like bacteria that cause disease in animals and humans. The species A. israelii is the causative organism of human actinomycosis.

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Ac·ti·no·my·ces (ak″tĭ-no-miґsēz) [actino- + Gr. mykēs fungus] a genus of bacteria of the family Actinomycetaceae, consisting of gram-positive, irregularly staining, straight or slightly curved rods that form branched filaments; organisms are asporogenous, non–acid-fast, nonmotile, and chemo-organotrophic. The type species is A. boґvis.

Medical dictionary. 2011.

Look at other dictionaries:

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  • Actinomyces — См. Актиномицеты (Источник: «Словарь терминов микробиологии») …   Словарь микробиологии

  • Actinomyces — Harz. (Strahlenpilz), Gattung niederer Pilze, deren Stellung im System noch unsicher ist. Der Vegetationskörper besteht aus einem farblosen, fädigen Mycel, dessen mitunter an der Spitze kolbenförmig geschwollene Zweige von einer zentralen Partie… …   Meyers Großes Konversations-Lexikon

  • Actinomyces — Actinomȳces, s. Aktinomykose …   Kleines Konversations-Lexikon

  • Actinomyces — ? Актиномицеты Actinomyces israelii …   Википедия

  • Actinomyces —   Actinomyces Cambio …   Wikipedia Español

  • Actinomyces — Taxobox color = lightgrey name = Actinomyces image width = 240px image caption = Scanning electron micrograph of Actinomyces israelii . domain = Bacteria phylum = Actinobacteria ordo = Actinomycetales familia = Actinomycetaceae genus =… …   Wikipedia

  • Actinomyces — Actinobacteria Actinomycètes …   Wikipédia en Français

  • actinomyces — noun (plural actinomyces) Etymology: New Latin, genus name, from actin + Greek mykēt , mykēs fungus; akin to Greek myxa mucus more at mucus Date: 1882 any of a genus (Actinomyces) of filamentous or rod shaped bacteria that includes usually… …   New Collegiate Dictionary

  • actinomyces — actinomycetal, adj. /ak tin oh muy seez, ak teuh noh /, n., pl. actinomyces. Bacteriol. any of several saprophytic, filamentous, anaerobic bacteria of the genus Actinomyces, certain species of which are pathogenic for humans and animals. [ < NL… …   Universalium

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