Bacteria diversity desulfovibrio

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  • 1. Desulfovibrio
  • 2. Taxonomy Domain: Eubacteria Phylum: Proteobacteria (purple bacteria) Class: -Proteobacteria Order: Desulfavibrionales Family: Desulfovibrionaceae Genus: Desulfovibrio
  • 3. Representative species www.deskuenvis.nic.in D. vulgaris http://n-equals-one.com D. desulfuricans
  • 4. Morphology Colonies Pink or peach colored Cells Dimensions: 2.5-10 m long 0.5-1.5 m wide Gram negative Shape: Curved rods (vibrio)
  • 5. Physiology Non-spore forming Mesophilic Motility Motile Polar flagella Mono- or lophotrichous Produces black precipitate throughout SIM tube
  • 6. Metabolism Either Chemoorganoheterotrophic or Chemolithoautotrophic Strict anaerobes some strains are shown to be aerotolerant Anaerobic Respiration or Fermentation Carbon sources: acetate, formate, lactate, pyruvate, CO2, other organic compounds (eg. crude oil components)
  • 7. Metabolism Electron donors: formate, lactate, pyruvate, acetate, iron, H2 Electron acceptors: SO4 2- , other oxidized sulfur species, oxidized nitrogen species (eg. nitrate, nitrite) Major products of metabolism: H2S
  • 8. Global Sulfur Cycle
  • 9. Habitat/Environmental adaptation Found in organic-rich anoxic environments: Mud, sediment of polluted lakes Sewage lagoons and methane digesters (bioreactors) Waterlogged soils Oil fields
  • 10. Bioremediation Sewage, industrial wastewater, and mine drainage contain toxic heavy metals (Cr, Cu, Mn, Zn) H2S produced by Desulfovibrio species removes heavy metals by precipitation Used in toxic waste cleanup
  • 11. Experiment Measured the capacity of Desulfovibrio desulfuricans to precipitate heavy metals from wastewater Organic dye production wastewater treated for 6 days with Desulfovibrio desulfuricans in an anaerobic bioreactor had reduced heavy metal concentrations: [Zn2+] reduced by 97.53% [Ni2+] reduced by 98.96% [Cu2+] reduced by 85.42%
  • 12. Negative effects High [H2S] can kill local flora Rotten egg smell Corrosion of iron pipelines by reducing iron metal: Fe(s) Fe2+ (aq)
  • 13. Infections http://www.ncbi.nlm.nih.gov/pmc/articles/PMC156571/
  • 14. Question What role does sulfate play in Desulfovibrio metabolism? A. sulfur source B. electron donor C. electron acceptor D. carbon source
  • 15. References Cabrera, G., Prez, R., Gomez, J. M., Abalos, A., & Cantero, D. (2006). Toxic effects of dissolved heavy metals on Desulfovibrio vulgaris and Desulfovibrio sp. strains. Journal of hazardous materials, 135(1), 40-46. Desulfovibrio. (2006). In Dictionary of microbiology & molecular biology. Retrieved from http://proxy.iusb.edu:2443/login?qurl=http%3A%2F%2Fproxy.iusb.edu%3A3194%2Fco ntent%2Fentry%2Fwileymicrob%2Fdesulfovibrio%2F0 Kosinska, K., Miskiewicz, T. (2012) Precipitation of heavy metals from industrial wastewater by Desulfovibrio desulfuricans. Environment Protection Engineering, 38, 51- 60. Voordouw, G. (1995). The genus Desulfovibrio: the centennial. Applied and environmental microbiology, 61(8), 2813. Wiley, J.M., Sherwood, L.M., Woolverton C.J. (2014). Prescotts Microbiology. New York: McGraw-Hill. Magot M et al. (2004). Int. J. Syst. Evol. Microbiol. 54:1693-1697.