Geobacillus stearothermophilus, Gram-stain
Geobacillus (Bacillus) stearothermophilus
Taxonomy
Morphology
Growth conditions
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Geobacillus, Geobacillus stearothermophilus Nazina,
Tourova et al., 2001 (Donk ,1920).

Hystorical synonyms:
Bacillus kaustophilus Prickett (1928), Bacillus thermoliquefaciens
Galesloot and Labots (1959).
1.5-2.7 / 0.6 -0.9 µm, usually motile by peritrichous flagella;
Gram-positive, Gram-variable or Gram-negative;
Spores are ellipsoidal, subterminal or terminal; usually swelling the sporangia.
Aerobic, do not grow anaerobically.
Growth temperature  from  30-45 ºC  to  65-75 ºC.
Do not grow at pH 5.5-8.5 or in 7 percent NaCl.
Spores occur in soil. Vegetative growth is rapid in many foods of pH above 5.0 if held
at an appropriate elevated temperature. Spores are destroyed in 15-18 min. at 121 ºC
wet heat and in 20 min. at 180 ºC dry heat.
Unknown (none).
  1. Gordon R.E., Haynes W.C., Pang C.H. (1973) – The genus Bacillus . Agriculture Handbook No. 427, U.S.D.A., Washington D.C.
  2. 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.
  3. Bîlbîie V., Pozsgi N., 1985, Bacteriologie Medicală, vol.ll, Ed. Medicală, Bucureşti.
  4. Logan N. A.,2005. Bacillus anthracis, Bacillus cereus, and other aerobic endospore-forming bacteria. In: Boriello S.P., Murray P.R.,
    Funke G. (Ed),Topley & Wilson’s Microbiology & Microbial Infections.Bacteriology, Vol. 2, pp. 922-952.
Hydrolysis of starch & acid from glucose positive.
Voges-Proskauer & indole negative.
Acid production from, xylose, arabinose and mannitol.
Utilization of citrate as a source of carbon, nitrate reduction to nitrite, catalase test &
casein decomposition are variable.
(c) Costin Stoica
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