| Cellulomonas humilata (Actinomyces humiferus) |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Micrococcales, Suborder Micrococcineae, Family
Cellulomonadaceae, Genus Cellulomonas, Cellulomonas humilata corrig. (Gledhill and Casida 1969) Collins and Pascual 2000.
Historical synonym: Actinomyces humiferus Gledhill and Casida 1969.
Cellulomonadaceae, Genus Cellulomonas, Cellulomonas humilata corrig. (Gledhill and Casida 1969) Collins and Pascual 2000.
Historical synonym: Actinomyces humiferus Gledhill and Casida 1969.
Gram-positive predominantly filamentous and branched cells, often with swollen
ends; in time, usually, fragment into diphtheroid or coccoid elements. Non-acid-fast.
Non-motile. Non-spore-forming.
ends; in time, usually, fragment into diphtheroid or coccoid elements. Non-acid-fast.
Non-motile. Non-spore-forming.
Colonies are small, opaque, smooth, occasionally rough , convex, with a dark central
region on heart infusion agar. In liquid media growth is granular or flocculent, with a
white sediment, without turbidity. Aerobic / microaerophilic. Grows at 30 ºC, optimum.
No growth in 4% NaCl media.
region on heart infusion agar. In liquid media growth is granular or flocculent, with a
white sediment, without turbidity. Aerobic / microaerophilic. Grows at 30 ºC, optimum.
No growth in 4% NaCl media.
The natural habitat is organically rich soil. Sensitive to lysozyme.
Undetermined.
- Collins M.D. and Pascual C., 2000. Reclassification of Actinomyces humiferus (Gledhill and Casida) as Cellulomonas humilata
nom. corrig., comb. nov. Int J Syst Evol Microbiol 50, 661-663. - Slack J.M., 1975. Genus Actinomyces Harz 1877. In: Buchanan R.E. and Gibbons N.E. (Editors), Bergey’s Manual of Determinative
Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore, 660-667.
Positive results for casein hydrolysis, esculin hydrolysis, gelatin hydrolysis (weak reaction), H2S production, methyl-red reduction, starch
hydrolysis, acid production from L-arabinose, cellobiose, dextrin, fructose, galactose, gentibiose, D-glucose, maltose, mannitol,
mannose, melezitose, melibiose, raffinose, rhamnose, salicin, sucrose, starch, turanose and D-xylose.
Negative results for catalase, indole production, nitrates reduction, oxidase, tyrosine hydrolysis, urea hydrolysis, Voges-Proskauer test,
xanthine hydrolysis, acid production from adonitol, dulcitol, inositol, inulin, ribose and sorbitol.
Variable results for acid production from glycerol, lactose and trehalose.
hydrolysis, acid production from L-arabinose, cellobiose, dextrin, fructose, galactose, gentibiose, D-glucose, maltose, mannitol,
mannose, melezitose, melibiose, raffinose, rhamnose, salicin, sucrose, starch, turanose and D-xylose.
Negative results for catalase, indole production, nitrates reduction, oxidase, tyrosine hydrolysis, urea hydrolysis, Voges-Proskauer test,
xanthine hydrolysis, acid production from adonitol, dulcitol, inositol, inulin, ribose and sorbitol.
Variable results for acid production from glycerol, lactose and trehalose.
(c) Costin Stoica
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