Arsenic tolerance in bacterial cultures isolated from metal contaminated soil

Alaniz-Andrade, Azucena Lucero; León, Consuelo Letechipía de; Guzmán-Moreno, Jesús; Vidales-Rodríguez, Luz Elena

doi:10.15174/au.2017.1189

Cited by 1 publication

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“…Guan et al (2017) showed that membrane proteins such as ArsB and ACR3 can be used to remove toxic arsenite species from the cells. Alaniz-Andrade et al (2017) described organisms from the orders of Bacillus , Micrococcus , and Acinetobacter , which could withstand As concentrations as high as 25 mM of arsenite. However, these tolerances were ascribed to adaptation.…”

Section: Discussionmentioning

confidence: 99%

Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream units

et al. 2019

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The metal(loid) and in particular the Arsenic (As) burden of thirteen agricultural biogas plants and two sewage sludge digesters were investigated together with the corresponding microbial consortia. The latter were characterized by ARISA (automated ribosomal intergenetic spacer analysis) and next generation sequencing. The consortia were found to cluster according to digester type rather than substrate or metal(loid) composition. For selected plants, individual As species in the liquid and gaseous phases were quantified, showing that the microorganisms actively metabolize and thereby remove the As from their environment via the formation of (methylated) volatile species. The As metabolites showed some dependency on the microbial consortia, while there was no statistical correlation with the substrate mix. Finally, slurry from one agricultural biogas plant and one sewage sludge digester was transferred into laboratory scale reactors (“satellite reactors”) and the response to a defined addition of As (30 and 60 µM sodium arsenite) was studied. The results corroborate the hypothesis of a rapid conversion of dissolved As species into volatile ones. Methanogenesis was reduced during that time, while there was no discernable toxic effect on the microbial population. However, the utilization of the produced biogas as replacement for natural gas, e.g. as fuel, may be problematic, as catalysts and machinery are known to suffer from prolonged exposure even to low As concentrations.

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Section: Discussionmentioning

confidence: 99%