Characterization of marine bacteria highly resistant to mercury exhibiting multiple resistances to toxic chemicals

J, De; Ramaiah, N.

doi:10.1016/j.ecolind.2006.05.002

Cited by 51 publications

(18 citation statements)

References 25 publications

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“…Worldwide many areas contaminated with mercury pose threat to people and environment (De and Ramaiah, 2007). Effects of mercury on functional parameters have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Mercury tolerant diazotrophic bacteria in a long-term contaminated soil

Oliveira¹,

Pampulha²,

Neto³

et al. 2010

Geoderma

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“…Worldwide many areas contaminated with mercury pose threat to people and environment (De and Ramaiah, 2007). Effects of mercury on functional parameters have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Mercury tolerant diazotrophic bacteria in a long-term contaminated soil

Oliveira¹,

Pampulha²,

Neto³

et al. 2010

Geoderma

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“…Previous studies have described the isolation of many organic and/or inorganic mercury-resistant bacteria belonging to species of the genera Pseudomonas, Staphylococcus, Bacillus, and Escherichia from various mercurycontaminated environments (Mindlin et al 2005;Kannan and Krishnamoorthy 2006;De and Ramaiah 2007;Poulain et al 2007;Mirzaei et al 2008;Bafana et al 2010). Most mercury-resistant Gram-positive and Gram-negative bacteria possess mer operons as their mercury-resistant determinants, which are usually located on transposons, plasmids, or the bacterial chromosomes (Osborn et al 1997;Nascimento and Chartone-Souza 2003).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a marine-isolated mercury-resistant Pseudomonas putida strain SP1 and its potential application in marine mercury reduction

Zhang

Chen

Liu

2011

Appl Microbiol Biotechnol

121

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The Pseudomonas putida strain SP1 was isolated from marine environment and was found to be resistant to 280 μM HgCl 2 . SP1 was also highly resistant to other metals, including CdCl 2 , CoCl 2 , CrCl 3 , CuCl 2 , PbCl 2 , and ZnSO 4 , and the antibiotics ampicillin (Ap), kanamycin (Kn), chloramphenicol (Cm), and tetracycline (Tc). mer operon, possessed by most mercury-resistant bacteria, and other diverse types of resistant determinants were all located on the bacterial chromosome. Cold vapor atomic absorption spectrometry and a volatilization test indicated that the isolated P. putida SP1 was able to volatilize almost 100% of the total mercury it was exposed to and could potentially be used for bioremediation in marine environments. The optimal pH for the growth of P. putida SP1 in the presence of HgCl 2 and the removal of HgCl 2 by P. putida SP1 was between 8.0 and 9.0, whereas the optimal pH for the expression of merA, the mercuric reductase enzyme in mer operon that reduces reactive Hg 2+ to volatile and relatively inert monoatomic Hg 0 vapor, was around 5.0. LD 50 of P. putida SP1 to flounder and turbot was 1.5× 10 9 CFU. Biofilm developed by P. putida SP1 was 1-to 3-fold lower than biofilm developed by an aquatic pathogen Pseudomonas fluorescens TSS. The results of this study indicate that P. putida SP1 is a low virulence strain that can potentially be applied in the bioremediation of HgCl 2 contamination over a broad range of pH.

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“…The dogma that maintenance of resistance genes in the absence of selection is energetically costly for an organism has become less accepted as studies have shown that some organisms carrying resistance genes in a population are actually quite robust (Salyers & Amabile‐Cuevas, 1997; Singer et al , 2006). Additionally, metal pollution has been demonstrated to indirectly aid in the long‐term persistence of antibiotic resistance in bacterial communities due to a combination of the stability of metals in terrestrial and aquatic environments and commonly occurring co‐ and cross‐resistance to metal toxicity and antibiotics (Rasmussen & Sorenson, 1998; Baker‐Austin et al , 2006; Wright et al , 2006; De & Ramaiah, 2007).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and patterns of antibiotic resistance in vertebrates off the Northeastern United States coast

Rose

Gast

Bogomolni

et al. 2009

FEMS Microbiology Ecology

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The prevalence of antibiotic-resistant bacteria in the marine environment is a growing concern, but the degree to which marine mammals, seabirds and fish harbor these organisms is not well documented. This project sought to identify the occurrence and patterns of antibiotic resistance in bacteria isolated from vertebrates of coastal waters in the northeastern United States. 472 isolates of clinical interest were tested for resistance to a suite of 16 antibiotics. Fifty-eight percent were resistant to at least one antibiotic, while 43% were resistant to multiple antibiotics. A multiple antibiotic resistance (MAR) index value greater than or equal to 0.2 was observed in 38% of the resistant pathogens, suggesting exposure of the animals to bacteria from significantly contaminated sites. Groups of antibiotics were identified for which bacterial resistance commonly co-occurred. Antibiotic resistance was more widespread in bacteria isolated from seabirds than marine mammals, and was more widespread in stranded or bycaught marine mammals than live marine mammals. Structuring of resistance patterns based on sample type (live/stranded/bycaught) but not animal group (mammal/bird/fish) was observed. These data indicate that antibiotic resistance is widespread in marine vertebrates, and they may be important reservoirs of antibiotic resistant bacteria in the marine environment.

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Characterization of marine bacteria highly resistant to mercury exhibiting multiple resistances to toxic chemicals

Cited by 51 publications

References 25 publications

Mercury tolerant diazotrophic bacteria in a long-term contaminated soil

Mercury tolerant diazotrophic bacteria in a long-term contaminated soil

Characterization of a marine-isolated mercury-resistant Pseudomonas putida strain SP1 and its potential application in marine mercury reduction

Occurrence and patterns of antibiotic resistance in vertebrates off the Northeastern United States coast

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