Bergey's manual of determinative bacteriology : a key for the identification of organisms of the class schizomycetes / arranged by a committee of the Society of American Bacteriologists.

  • Bergey, D. H. (David Hendricks), 1860-1937.
Date:
1923
Catalogue details

Licence: In copyright

Credit: Bergey's manual of determinative bacteriology : a key for the identification of organisms of the class schizomycetes / arranged by a committee of the Society of American Bacteriologists. Source: Wellcome Collection.

    353/496 (page 337)
    Rods: 0.5 to 0.8 by 3.0 to 6.0 microns, usually occurring singly, occasion¬ ally in short chains. Non-motile. Spores oval, terminal, of slightly greater diameter than the rods. Gram-positive. Agar stab: Scant growth. No gas. Dextrose agar shake cultures: At first lenticular colonies, but later becoming fluffy. Gelatin: Scant growth. No liquefaction. Litmus milk: Acid reaction. No coagulation. No digestion. Meat hash medium: Slightly turbid with numerous gas bubbles. Acid formed in dextrose but not in lactose and sucrose. No gas is formed in dextrose media. Liver broth: Good growth with gas formation. Pathogenic. Anaerobic. Forms an extoxin. Optimum temperature 37°C. Habitat: Larvae of Lucilia caesar. Produces limberneck in chickens. Toxin is not neutralized by botulinus antitoxin. ORDER II. ACTINOMYCETALES BUCHANAN Cells usually elongated, frequently filamentous and with a decided tendency to the development of branches, in some genera giving rise to the formation of a definite branched mycelium. Cells frequently show swellings, clubbed or irregular shapes. No pseudoplasmodium. No deposits of free sulphur or iron. No bacteriopurpurin. Endospores not produced but conidia are developed in some genera. Usually Gram¬ positive. Non-motile. Some species parasitic in animals or plants. As a rule strongly aerobic (except for some species of Actinomyces and the genera Fusiformis and Leptotrichia) and oxidative. Complex proteins frequently required. Growth on culture media often slow; some genera showing mold-like colonies. No water forms. Key to the families of the order Actinomycetales (Buchanan) A. Filamentous forms, often branched, sometimes forming mycelia. Conidia sometimes present. Some species parasitic. Family I. Actinomycetaceae. B. Parasitic forms. Rod-shaped, rarely filamentous, and with only slight and occasional branching. No conidia. Family II. Mycobacteriaceae.