Mercury tolerant diazotrophic bacteria in a long-term contaminated soil

Diversity and complexity of microbial communities from a chlor-alkali tailings dump

“…In agreement with our work, previous studies have indicated that among structuring factors, anthropogenic Hg has a broad-spectrum effect and can alter the structure of both the culturable and total bacterial communities (Müller et al, 2001). For example, some studies have shown anthropogenic Hg to impart a negative effect on the culturable diazotrophic community (Lauber et al, 2008;Boer et al, 2012) and a predominance of Gammaproteobacteria Pseudomonas isolates among Hg tolerant bacteria (Oliveira et al, 2010). We observed a dominance of Gammaproteobacteria in our study site (24% of total number of sequences) and found that Pseudomonas genera (72% of Gammaproteobacteria sequences) were especially well represented within the tailings dump community.…”

Biogeochemical factors affecting mercury methylation rate in two contaminated floodplain soils

“…Secondly, microorganisms in Hg contaminated soils can be well adapted to Hg stress. This adaption can favor the selection of Hg tolerant bacteria in soils (Oliveira et al, 2010;Ruggiero et al, 2011). As a consequence, demethylation can be stimulated at high inorganic Hg concentrations by Hg tolerant bacteria which lead to reductive demethylation of MeHg (Schäfer et al, 2004).…”

Detoxification of mercury pollutant leached from spent fluorescent lamps using bacterial strains

“…This level of mercury tolerance is considered very high compared to literature (Oliveira et al, 2010;Maiti and Bahattacharyya, 2013). Our interest in the present study is to apply these bacteria to bio remediate mercury leached from fluorescent lamps which contains a maximum concentration of mercury (5.5 ppm).…”

“…This may explain the heterogeneous data obtained between the two experimental trials in the present study as each bacterial species and/or strain requires its own optimal conditions of growth. The requirement of optimal temperature, pH, nutrients and amount of mercury salt used in preliminary isolation media are all essentials to enhance the bacterial bio-uptake capacity and to maintain its consistency (Oliveira et al, 2010;Maiti and Bahattacharyya, 2013). Some of the initial collation of bacterial strains obtained from Qatari environment was mentioned in different studies for their ability to bioremediate heavy metals (Pepi et al, 2011;Naik and Dubey, 2013;Alhasawi et al, 2015).…”