Brevundimonas (Pseudomonas) diminuta
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pseudomonadales, Family Pseudomonadaceae, Genus Pseudomonas,
Pseudomonas diminuta
Leifson and Hugh 1954.
Moved to Phylum Proteobacteria, Class Alphaproteobacteria, Order Caulobacterales, Family Caulobacteraceae, Genus
Brevundimonas,
Brevundimonas diminuta (Leifson and Hugh 1954) Segers et al. 1994, type species of the genus.
(Synonym:
Bacterium parvulum)
Gram-negative, 0.5 x 1.0-4.0 μm, motile rods by one polar flagellum.
Smooth, glistening, opaque, circular, convex with entire edge colonies. No pigment
produced, nonhemolytic.
Strictly aerobic, optimal temperature 30 ºC. Can grow at 41
ºC, not at 4 ºC. Pantothenate, biotin, cystine and cyanocobalamin are required as
growth factors.
Grows on: Nutritive agar, Trypticase Soy Agar, Mueller-Hinton agar,
TSI, Mac Conkey
agar.
Isolated from water & clinical specimens.
Unknown. Is commonly used as a test organism for the efficiency of water filters due to the small size of the bacterium.
  1. George M. Garrity, Julia A. Bell and Timothy Lilburn: Order V. Caulobacterales Henrici and Johnson 1935b, 4AL. In Bergey’s
    Manual of Systematic Bacteriology Second Edition Volume Two The Proteobacteria Part C The Alpha-, Beta-, Delta-, and
    Epsilonproteobacteria, George M. Garrity Editor-in-Chief, 2005, pp 285-323.
  2. Leifson E. & Hugh R.: A new type of polar monotrichous flagellation. Journal of General Microbiology, 1954, 10, 68-70.
  3. Kaltenbach C. M., Moss C. W. & Weaver R. E.: Cultural and biochemical characteristics and fatty acid composition of
    Pseudomonas diminuta and Pseudomonas vesiculare. J Clin Microbiol. 1975 April; 1(4): 339–344.
Accumulate poli-beta-hydroxybutyrate as intracellular carbon reserve, especially in
nitrogen-deficient media.

Positive results for alkaline and acid phosphates,
catalase & oxidase.
Can utilize: acetate, butyrate, mucate, L-leucine, L-serine, L-histidine, DL-norvaline & L-aspartate.

Negative results for arginine dihydrolase, denitrification, esculin hydrolysis, egg yolk reaction, alpha-fucosidase, alpha- & beta-
glucosidase, gelatin hydrolysis, alpha- and beta-glucosidase, N-acetyl beta-glucosidase, alpha-mannosidase, indole production,
lysine and ornithine decarboxylases, starch hydrolysis, Tween 80, urease, & valine arylamidase.  Nitrite is rarely produced from nitrate.
No utilization of: D- and L-arabitol, erythritol, gluconate, 2-ketogluconate, 5-ketogluconate, glycerol, benzoate, caprate, n-caproate,
caprylate, citraconate, citrate, isobutyrate, glutarate, DL-glycerate, glycolate, heptanoate, itaconate, levulinate, maleate, D-malate,
malonate, D- and L-tartrate, meso-tartrate, acetamide, D- and L--tryptophan, urea, L-rhamnose, mannitol, L-arabinose, sorbitol,
sucrose, D-cellobiose, starch, DL-lactate, D-xylose, adonitol, D-mannose, D-glucose, D-galactose, arbutin, salicin, maltose,
trehalose, propionate, amygdalin, isobutyrate n -caproate, adipate, pimelate, suberate, azelate, sebacate, glycine & aconitate.

Variable results for the utilization of: valerate, succinate, fumarate, L-malate, 2-ketoglutarate, D-alpha-alanine, L-alanine, L-isoleucine,
L-valine, L-norleucine, DL-norvaline, L-threonine, L-tyrosine & L-arginine.
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