Potential of Bacterial Isolates from a Stream in Manaus-Amazon to Bioremediate Chromium-Contaminated Environments View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-08

AUTHORS

Ydrielly Veras Teles, Lorena Mota de Castro, Ézio Sargentini Junior, Aryana Pinheiro do Nascimento, Henrique Alves da Silva, Rebeca Silveira Costa, Rayane Delmontes do Nascimento Souza, Adolfo José da Mota, José Odair Pereira

ABSTRACT

Igarapé do Quarenta (IgQ), a stream located in the Manaus-AM, BR, has directly experienced the impacts of urban expansion over the last five decades, which contributed for its contamination. As an affluent of Rio Negro, IgQ also affects the water quality of this important river that bathes Manaus. However, the stress caused by the prolonged exposition to chemical agents may have selected microorganisms that exhibit great bioremediation potential. In the present study, bacteria isolated from four distinct sites of the IgQ were identified, and their potential to degrade hexavalent chromium (Cr(VI)) was investigated using the s-diphenylcarbazide method. Among the investigated isolates, 14 exhibited resistance against Cr(VI) at a concentration of 300 mg/L and eight isolates reduced over 50% (53.5-97.4%) chromium ratios after 72 h of incubation. Those isolates were identified by gene sequencing and classified in 10 genera (Acidovorax sp., Acinetobacter sp., Alicycliphilus sp., Bacillus sp., Comamonas sp., Enterobacter sp., Micrococcus sp., Proteus sp., Serratia sp., and Vagococcus sp.). Under control conditions, the isolate of Vagococcus sp. genus, in only 24 h of incubation, reduced 96.8% of the rate of Cr(VI) added to the culture medium at the concentration of 10 mg/L. Obtained results indicate that the Vagococcus sp. exhibits a great potential to be used in the bioremediation of areas contaminated with chromium. The mechanisms of action of microorganisms should be investigated for more specific applications in the decontamination of effluents and direct use of its by-products to bioremediate polluted environments. More... »

PAGES

266

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11270-018-3903-1

DOI

http://dx.doi.org/10.1007/s11270-018-3903-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1105907691

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30147191


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37 schema:description <i>Igarapé do Quarenta</i> (IgQ), a stream located in the Manaus-AM, BR, has directly experienced the impacts of urban expansion over the last five decades, which contributed for its contamination. As an affluent of <i>Rio Negro</i>, IgQ also affects the water quality of this important river that bathes Manaus. However, the stress caused by the prolonged exposition to chemical agents may have selected microorganisms that exhibit great bioremediation potential. In the present study, bacteria isolated from four distinct sites of the IgQ were identified, and their potential to degrade hexavalent chromium (Cr(VI)) was investigated using the s-diphenylcarbazide method. Among the investigated isolates, 14 exhibited resistance against Cr(VI) at a concentration of 300 mg/L and eight isolates reduced over 50% (53.5-97.4%) chromium ratios after 72 h of incubation. Those isolates were identified by gene sequencing and classified in 10 genera (<i>Acidovorax</i> sp., <i>Acinetobacter</i> sp., <i>Alicycliphilus</i> sp., <i>Bacillus</i> sp., <i>Comamonas</i> sp., <i>Enterobacter</i> sp., <i>Micrococcus</i> sp., <i>Proteus</i> sp., <i>Serratia</i> sp., and <i>Vagococcus</i> sp.). Under control conditions, the isolate of <i>Vagococcus</i> sp. genus, in only 24 h of incubation, reduced 96.8% of the rate of Cr(VI) added to the culture medium at the concentration of 10 mg/L. Obtained results indicate that the <i>Vagococcus</i> sp. exhibits a great potential to be used in the bioremediation of areas contaminated with chromium. The mechanisms of action of microorganisms should be investigated for more specific applications in the decontamination of effluents and direct use of its by-products to bioremediate polluted environments.
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