| Actinomyces israelii | A species of bacteria causing human actinomycosis and, occasionally, infections in cattle. (05 Mar 2000) |
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| Actinomyces naeslundii | A species whose natural habitat is the oral cavity; human infections have been reported, and it produces periodontal destruction in some species of animals. (05 Mar 2000) |
| Actinomyces odontolyticus | A species whose normal habitat is the human oral cavity; it has been isolated from deep dental caries. (05 Mar 2000) |
| Actinomyces pyogenes | <bacteria> A species of corynebacterium isolated from abscesses of warm-blooded animals. (12 Dec 1998) |
| actinomyces viscosus | <microbiology> A species of actinomyces found in the oral cavity of man and hamsters. It has been isolated from actinomycotic lesions in swine, cats, and dogs and has been identified as a causative agent of animal diseases. (12 Dec 1998) |
| actinomycetaceae | <microbiology> A family of bacteria including numerous parasitic and pathogenic forms. (12 Dec 1998) |
| actinomycetales | An order of gram-positive, primarily aerobic bacteria that tend to form branching filaments. (12 Dec 1998) |
| actinomycetales infections | Infections with bacteria of the order actinomycetales. (12 Dec 1998) |
| actinomycetes | <bacteria> Gram-positive bacteria that can form branching filaments. They may form true mycelia or produce conidiospores. (13 Nov 1997) |
| actinomycin | A group of peptide antibiotic agents, isolated from several species of Streptomyces (originally Actinomyces), that are active against Gram-positive bacteria, fungi, and neoplasms. Actinomycins are chromopeptides, most containing the chromophore actinocin, and are derivatives of phenoxazine that differ in their amino acids and their sequence in the peptide chains; they form complexes with DNA and therefore inhibit RNA synthesis, primarily the ribosomal type. Actinomycin A, the first of the actinomycin's isolated in crystalline form. (05 Mar 2000) |
| actinomycin C | Produced by Streptomyces chrysomallus. A mixture of actinomycins C1 (dactinomycin), C2, and C3 used as an antineoplastic, immunosuppressive agent. See: actinomycin. Synonym: actinomycin C. (05 Mar 2000) |
| actinomycin D | <drug, oncology> A relatively toxic antibiotic produced by the funguslike bacterium Streptomyces parvallum. It inhibits RNA transcription in eukaryotes and has antitumour properties, so it is often used in conjunction with other drugs in chemotherapy. (06 May 1997) |
| actinomycin F1 | KS4;produced by actinomycin C-elaborating strains of Streptomyces chrysomallus; used as an antineoplastic agent. (05 Mar 2000) |
| actinomycin lactonase | <enzyme> Opens the lactone rings of actinomycin to form actinomycinic acid Registry number: EC 3.1.1.39 (26 Jun 1999) |
| actinomycoma | A swelling caused by an actinomycete. See: mycetoma. Origin: actino-+ G. Mykes, fungus, + -oma, tumour (05 Mar 2000) |