Morphology of Bacillus cereus 4.78/5 (9)




Morphology of Bacillus cereus

Morphology of Bacillus cereus

  1. Bacillus cereus is gram positive rod shaped bacilli with square ends.
  2. Occasionally may appear gram variable or even gram negative with age.
  3. They are single rod shaped or appears in short chains.
  4. Clear cut junctions between the members of chains are easily visible.
  5. Tissue section staining may appear long and filamentous.
  6. They are straight or slightly curved.
  7. They are non-capsulated.
  8. It contains spores with central spores.
  9. Spores are oval (ellipsoidal) and not swelling the mother cell; and not formed in the animals blood and tissues or in aerobic culture.
  10. Is is 1×3-4 µm in size.
  11. It is motile and flagellated with peritrichous flagella.
  12. It is motile by two types of motility, swimming and swarming.
  13. Endospores are able to survive long periods of exposure to air and other adverse environmental conditions.
  14. It is beta-hemolytic bacterium which causes food borne disease.
  15. Its virulence factors include cerolysin and phospholipase.

Genome Structure

  • Circular chromosome with 5,411,809 nt in length.
  • Contains 5481 genes, 5234 proteins coding, 147 structural RNA and 5366 RNA operons.
  • Plasmid is 5 to 500 kb in size.

References

  1. Edward J. Bottone. Bacillus cereus, a Volatile Human Pathogen. Clin Microbiol Rev. 2010 Apr; 23(2): 382–398.
  2. LM Wijnands, JB Dufrenne, FM van Leusden. Bacillus cereus: characteristics, behaviour in the gastro-intestinal tract, and interaction with Caco-2 cells. RIVM report 250912003/2005.
  3. Choma C et al. Effect of temperature on growth characteristics of Bacillus cereus International Journal of Food Microbiology 55 (2000) 73–77.
  4. Floristean V., Carmen CreŃu, M. Carp-Cărare. Bacteriological Characteristics of Bacillus cereus isolates from poultry. Bulletin USAMV-CN, 64/2007 (1-2).
  5. Bacillus cereus. Mehrdad Tajkarimi. Materials from Maha Hajmeer.
  6. http://www.microbiologyinfo.com/different-size-shape-and-arrangement-of-bacterial-cells/
  7. http://www.microbiologyinpictures.com/bacteria-micrographs/gram-stain/gram-positive/bacillus-cereus.html
  8. http://www.uptodate.com/contents/bacillus-cereus-and-other-non-anthracis-bacillus-species
  9. http://www.phac-aspc.gc.ca/lab-bio/res/psds-ftss/bacillus-cereus-eng.php
  10. http://www.ppdictionary.com/bacteria/gpbac/cereus.htm
  11. https://microbewiki.kenyon.edu/index.php/Bacillus_cereus
  12. https://en.wikipedia.org/wiki/Bacillus_cereus

Morphology of Bacillus cereus

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The Author

Sagar Aryal

Sagar Aryal

I am Sagar Aryal, a passionate Microbiologist and the Scientific Blogger. I did my Master's Degree in Medical Microbiology and currently working as a Lecturer at Department of Microbiology, St. Xavier's College, Kathmandu, Nepal. I am particularly interested in research related to Medical Microbiology and Virology.

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  1. very interesent good work

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