The impact of resuspension on sediment mercury dynamics, and methylmercury production and fate: A mesocosm study

Kim, Eun‐Hee; Mason, Robert P.; Porter, Elka T.; Soulen, Heather L.

doi:10.1016/j.marchem.2006.05.006

Cited by 88 publications

(57 citation statements)

References 61 publications

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“…latitude, geomorphology, local meteorology, hydrodynamics) as well as natural and human-due nutrient enrichments caused, for instance, by agricultural soil drainages or discharges from urban and industrial effluents (Renzi et al, 2011). These features are also linked to the occurrence of higher levels of organic pollutants than other aquatic ecosystems (Kim et al, 2006;Specchiulli et al, 2008). The Bizerte lagoon, a major coastal lagoon on the northern coast of Tunisia is a particularly important fishing area which has also been used for shellfish production since 1964 (Beji, 2000).…”

Section: Introductionmentioning

confidence: 99%

Occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussel (Mytilus galloprovincialis) and eel (Anguilla anguilla) from Bizerte lagoon, Tunisia, and associated human health risk assessment

Barhoumi

Megdiche

Clérandeau

et al. 2016

Continental Shelf Research

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Section: Introductionmentioning

confidence: 99%

Occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussel (Mytilus galloprovincialis) and eel (Anguilla anguilla) from Bizerte lagoon, Tunisia, and associated human health risk assessment

Barhoumi

Megdiche

Clérandeau

et al. 2016

Continental Shelf Research

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“…Bioavailability of the mercurial compounds has direct influence on the levels of bacterialmediated volatilization of the mercury. This in turn is dependent on the nature and concentration of the binding phase controlled by redox status of surrounding environment (Kim et al 2006). Thus, high efficacy of mer system has generated major interest in scientific community for its detailed studies and possible utilization as a biotechnological vehicle for employing such genetic resistance mechanisms for the remediation of mercury-related environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Bacterial mer operon-mediated detoxification of mercurial compounds: a short review

2011

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Mercury pollution has emerged as a major problem in industrialized zones and presents a serious threat to environment and health of local communities. Effectiveness and wide distribution of mer operon by horizontal and vertical gene transfer in its various forms among large community of microbe reflect importance and compatibility of this mechanism in nature. This review specifically describes mer operon and its generic molecular mechanism with reference to the central role played by merA gene and its related gene products. The combinatorial action of merA and merB together maintains broad spectrum mercury detoxification system for substantial detoxification of mercurial compounds. Feasibility of mer operon to coexist with antibiotic resistance gene (ampr, kanr, tetr) clusters enables extensive adaptation of bacterial species to adverse environment. Flexibility of the mer genes to exist as intricate part of chromosome, plasmids, transposons, and integrons enables high distribution of these genes in wider microbial gene pool. Unique ability of this system to manipulate oligodynamic property of mercurial compounds for volatilization of mercuric ions (Hg2+) makes it possible for a wide range of microbes to tolerate mercury-mediated toxicity.

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“…The bioavailability of mercury determines how much of the total Hg present is accessible to microorganisms. The bioavailability of mercury is dependent on the nature and concentration of the binding phase, which in turn are controlled by the redox status (14). Another important parameter is the ability of microbial communities to volatilize mercury, i.e., the abundance, diversity, and activity of the mercury-resistant members of the communities.…”

mentioning

confidence: 99%

Cultivation of Hard-To-Culture Subsurface Mercury-Resistant Bacteria and Discovery of New merA Gene Sequences

Rasmussen

Zawadsky

Binnerup

et al. 2008

Appl Environ Microbiol

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Mercury-resistant bacteria may be important players in mercury biogeochemistry. To assess the potential for mercury reduction by two subsurface microbial communities, resistant subpopulations and their merA genes were characterized by a combined molecular and cultivation-dependent approach. The cultivation method simulated natural conditions by using polycarbonate membranes as a growth support and a nonsterile soil slurry as a culture medium. Resistant bacteria were pregrown to microcolony-forming units (mCFU) before being plated on standard medium. Compared to direct plating, culturability was increased up to 2,800 times and numbers of mCFU were similar to the total number of mercury-resistant bacteria in the soils. Denaturing gradient gel electrophoresis analysis of DNA extracted from membranes suggested stimulation of growth of hard-to-culture bacteria during the preincubation. A total of 25 different 16S rRNA gene sequences were observed, including Alpha-, Beta-, and Gammaproteobacteria; Actinobacteria; Firmicutes; and Bacteroidetes. The diversity of isolates obtained by direct plating included eight different 16S rRNA gene sequences (Alpha-and Betaproteobacteria and Actinobacteria). Partial sequencing of merA of selected isolates led to the discovery of new merA sequences. With phylum-specific merA primers, PCR products were obtained for Alpha-and Betaproteobacteria and Actinobacteria but not for Bacteroidetes and Firmicutes. The similarity to known sequences ranged between 89 and 95%. One of the sequences did not result in a match in the BLAST search. The results illustrate the power of integrating advanced cultivation methodology with molecular techniques for the characterization of the diversity of mercury-resistant populations and assessing the potential for mercury reduction in contaminated environments.

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The impact of resuspension on sediment mercury dynamics, and methylmercury production and fate: A mesocosm study

Cited by 88 publications

References 61 publications

Occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussel (Mytilus galloprovincialis) and eel (Anguilla anguilla) from Bizerte lagoon, Tunisia, and associated human health risk assessment

Occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussel (Mytilus galloprovincialis) and eel (Anguilla anguilla) from Bizerte lagoon, Tunisia, and associated human health risk assessment

Bacterial mer operon-mediated detoxification of mercurial compounds: a short review

Cultivation of Hard-To-Culture Subsurface Mercury-Resistant Bacteria and Discovery of New merA Gene Sequences

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