Enrichment of arsenic transforming and resistant heterotrophic bacteria from sediments of two salt lakes in Northern Chile.

Extremophiles : Life Under Extreme Conditions
José LaraCecilia Demergasso

Abstract

Microbial populations are involved in the arsenic biogeochemical cycle in catalyzing arsenic transformations and playing indirect roles. To investigate which ecotypes among the diverse microbial communities could have a role in cycling arsenic in salt lakes in Northern Chile and to obtain clues to facilitate their isolation in pure culture, sediment samples from Salar de Ascotán and Salar de Atacama were cultured in diluted LB medium amended with NaCl and arsenic, at different incubation conditions. The samples and the cultures were analyzed by nucleic acid extraction, fingerprinting analysis, and sequencing. Microbial reduction of As was evidenced in all the enrichments carried out in anaerobiosis. The results revealed that the incubation factors were more important for determining the microbial community structure than arsenic species and concentrations. The predominant microorganisms in enrichments from both sediments belonged to the Firmicutes and Proteobacteria phyla, but most of the bacterial ecotypes were confined to only one system. The occurrence of an active arsenic biogeochemical cycle was suggested in the system with the highest arsenic content that included populations compatible with microorganisms able to transfo...Continue Reading

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Citations

Dec 10, 2015·Photochemistry and Photobiology·Virginia Helena AlbarracínMaría Eugenia Farias
Jan 7, 2016·Frontiers in Microbiology·Virginia H AlbarracínMaría E Farías
Jul 23, 2013·Ecotoxicology and Environmental Safety·Domenico Davolos, Biancamaria Pietrangeli
Mar 10, 2018·Microbial Ecology·Omar Federico OrdoñezMaría Eugenia Farías
Aug 5, 2017·Standards in Genomic Sciences·Antonio E SerranoCecilia Demergasso
May 12, 2018·Antonie van Leeuwenhoek·Lorena EscuderoCecilia Demergasso
Nov 15, 2018·Frontiers in Microbiology·Roberto OrellanaMichael Seeger
Apr 23, 2017·Scientific Reports·Daniel KurthMaría E Farías

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