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Isolation and characterization of a Lysinibacillus strain B1-CDA showing potential for bioremediation of arsenics from contaminated water
Högskolan i Skövde, Institutionen för biovetenskap. Högskolan i Skövde, Forskningscentrum för Systembiologi. Örebro Universitet. (Physiology, Pharmacology and Toxicology)ORCID-id: 0000-0002-8162-8945
Högskolan i Skövde, Institutionen för biovetenskap. Högskolan i Skövde, Forskningscentrum för Systembiologi. (Physiology, Pharmacology and Toxicology)
Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, India.
Örebro Universitet.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Journal of Environmental Science and Health. Part A: Toxic/Hazardous Substances and Environmental Engineering, ISSN 1093-4529, E-ISSN 1532-4117, Vol. 49, nr 12, s. 1349-1360Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The main objective of this study was to identify and isolate arsenic resistant bacteria that can be used for removing arsenic from thecontaminated environment. Here we report a soil borne bacterium, B1-CDA that can serve this purpose. B1-CDA was isolated fromthe soil of a cultivated land in Chuadanga district located in the southwest region of Bangladesh. The morphological, biochemicaland 16S rRNA analysis suggested that the isolate belongs to Lysinibacillus sphaericus. The minimum inhibitory concentration (MIC)value of the isolate is 500 mM (As) as arsenate. TOF-SIMS and ICP-MS analysis confirmed intracellular accumulation and removalof arsenics. Arsenic accumulation in cells amounted to 5.0 mg g¡1 of the cells dry biomass and thus reduced the arsenicconcentration in the contaminated liquid medium by as much as 50%. These results indicate that B1-CDA has the potential forremediation of arsenic from the contaminated water. We believe the benefits of implementing this bacterium to efficiently reducearsenic exposure will not only help to remove one aspect of human arsenic poisoning but will also benefit livestock and native animalspecies. Therefore, the outcome of this research will be highly significant for people in the affected area and also for humanpopulations in other countries that have credible health concerns as a consequence of arsenic-contaminated water.

sted, utgiver, år, opplag, sider
Taylor & Francis, 2014. Vol. 49, nr 12, s. 1349-1360
Emneord [en]
Pollution, toxic metals, arsenics, bioremediation, bacteria, bioaccumulation
HSV kategori
Forskningsprogram
Naturvetenskap; Bioinformatik
Identifikatorer
URN: urn:nbn:se:his:diva-9703DOI: 10.1080/10934529.2014.928247ISI: 000340370000002PubMedID: 25072766Scopus ID: 2-s2.0-84905275614OAI: oai:DiVA.org:his-9703DiVA, id: diva2:735941
Prosjekter
Bioremediation
Forskningsfinansiär
Sida - Swedish International Development Cooperation AgencyTilgjengelig fra: 2014-08-04 Laget: 2014-08-04 Sist oppdatert: 2018-10-11bibliografisk kontrollert
Inngår i avhandling
1. Bioremediation of Toxic Metals for Protecting Human Health and the Ecosystem
Åpne denne publikasjonen i ny fane eller vindu >>Bioremediation of Toxic Metals for Protecting Human Health and the Ecosystem
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Heavy metal pollutants, discharged into the ecosystem as waste by anthropogenic activities, contaminate drinking water for millions of people and animals in many regions of the world. Long term exposure to these metals, leads to several lethal diseases like cancer, keratosis, gangrene, diabetes, cardio- vascular disorders, etc. Therefore, removal of these pollutants from soil, water and environment is of great importance for human welfare. One of the possible eco-friendly solutions to this problem is the use of microorganisms that can accumulate the heavy metals from the contaminated sources, hence reducing the pollutant contents to a safe level.

In this thesis an arsenic resistant bacterium Lysinibacillus sphaericus B1-CDA, a chromium resistant bacterium Enterobacter cloacae B2-DHA and a nickel resistant bacterium Lysinibacillus sp. BA2 were isolated and studied. The minimum inhibitory concentration values of these isolates are 500 mM sodium arsenate, 5.5 mM potassium chromate and 9 mM nickel chloride, respectively. The time of flight-secondary ion mass spectrometry and inductively coupled plasma-mass spectroscopy analyses revealed that after 120 h of exposure, the intracellular accumulation of arsenic in B1-CDA and chromium in B2-DHA were 5.0 mg/g dwt and 320 μg/g dwt of cell biomass, respectively. However, the arsenic and chromium contents in the liquid medium were reduced to 50% and 81%, respectively. The adsorption values of BA2 when exposed to nickel for 6 h were 238.04 mg of Ni(II) per gram of dead biomass indicating BA2 can reduce nickel content in the solution to 53.89%. Scanning electron micrograph depicted the effect of these metals on cellular morphology of the isolates. The genetic composition of B1-CDA and B2-DHA were studied in detail by sequencing of whole genomes. All genes of B1-CDA and B2-DHA predicted to be associated with resistance to heavy metals were annotated.

The findings in this study accentuate the significance of these bacteria in removing toxic metals from the contaminated sources. The genetic mechanisms of these isolates in absorbing and thus removing toxic metals could be used as vehicles to cope with metal toxicity of the contaminated effluents discharged to the nature by industries and other human activities.

sted, utgiver, år, opplag, sider
Örebro: Örebro University, 2016. s. 80
Serie
Örebro Studies in Life Science, ISSN 1653-3100 ; 15
Emneord
Heavy Metals, Pollution, Accumulation, Remediation, Human Health, Bacteria, Genome Sequencing, de novo Assembly, Gene Prediction
HSV kategori
Forskningsprogram
Bioteknik
Identifikatorer
urn:nbn:se:his:diva-12885 (URN)978-91-7529-146-8 (ISBN)
Disputas
2016-09-22, Hus G, sal G 111, Högskolevägen, Skövde, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2016-09-07 Laget: 2016-09-07 Sist oppdatert: 2019-10-31bibliografisk kontrollert

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