Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus lentus Gibson (1935).
Phylogenetic studies indicate that B. circulans, B. firmus and B. lentus are closely related.
Gram positive, 0.6-0.9 x 1.2-4.0 μm, straight or slightly curved rods. Motile. Ellipsoidal, paracentral spore, may swell the
Colonies on TSA at 30 ºC are 1-2 mm in diameter, whitish, opaque and flat, with
glossy surfaces and entire margins. Growth temperature from 10 ºC to 35 ºC.
No growth in anaerobic agar. Grow in 5% NaCl, but not in 10% NaCl. NaCl is not
required for growth. Range of pH 6-9, optimum 8. Variable growth at pH 5 and 10.
Isolated from soil.
- Gordon R.E., Haynes W.C., Pang C.H. (1973) – The genus Bacillus . Agriculture Handbook No. 427, U.S.D.A., Washington D.C.
- Buchanan R.E., Gibbons N.E., Cowan S.T., Holt J.G., Liston J., Murray R.G.E., Niven C.F., Ravin A.W., Stanier R.W. ( 1974) –
Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore.
- N.A. Logan and P. De Vos, 2009. Genus I. Bacillus Cohn 1872. In: (Eds.) P.D. Vos, G. Garrity, D. Jones, N.R. Krieg, W. Ludwig, F.A.
Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3: The Firmicutes, Springer, 21-127.
Positive results for catalase, reduction of nitrate to nitrite, hydrolysis of starch, urease,
beta-galactosidase, hydrolysis of esculin, acid production (sometimes weak) from: L-
arabinose, amygdalin, arbutin, D-cellobiose, glucose, methyl beta-xyloside, mannitol,
D-fructose, galactose, beta-gentibiose, N-acetyl-D-glucosamine, lactose, D-mannose,
maltose, D-melezitose, D-melibiose, D-raffinose, rhamnose, ribose, salicin, starch,
sucrose, trehalose & D-xylose.
Negative results for egg yolk reaction, decomposition of casein, decomposition of
tyrosine, Voges-Proskauer reaction, arginine dihydrolase, lysine decarboxylase,
ornithine decarboxylase, hydrolysis of gelatin, resistance to lysozyme, tryptophan deaminase, indole production, H2S production, acid
production from: D-arabinose, adonitol, D- & L-arabitol, dulcitol, erythritol, D-fucose, glycerol, glycogen, gluconate, inulin. 2- &
5-ketogluconate, lyxose, sorbose, xylitol & L-xylose .
Variable results for citrate utilization, acid production from: L-fucose, meso-inositol & sorbitol.
(c) Costin Stoica