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| Auteur |
Boukef, I.; El Bour, M.; Al Gallas, N.; El Bahri, O.; Mejri, S.; Mraouna, R.; Ben Aissa, R.; Boudabous, A.; Got, P.; Troussellier, M. |
| Titre |
Survival of Escherichia coli Strains in Mediterranean Brackish Water in the Bizerte Lagoon in Northern Tunisia |
Type |
Article scientifique |
| Année |
2010 |
Publication |
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Revue Abrégée |
Water Environ Res |
| Volume |
82 |
Numéro |
11 |
Pages |
2249-2257 |
| Mots-Clés |
bizerte lagoon; brackish water; coastal waters; cytotoxicity; enteric bacteria; escherichia coli; fecal-coliforms; marine waters; salmonella-typhimurium; seawater microcosms; sewage; shigella-dysenteriae type-1; sunlight; survival; viability; virulence |
| Résumé |
This study investigated survival and virulence of Escherichia coli strains exposed to natural conditions in brackish water. Two E. coli strains (O126:B16 and O55:B5) were incubated in water microcosms in the Bizerte lagoon in Northern Tunisia and exposed for 12 days to natural sunlight in June (231 to 386 W/m(2), 26 +/- 1 degrees C, 30 g/L) and in April (227 to 330 W/m(2), 17 +/- 1 degrees C, 27 g/L) or maintained in darkness for 21 days (17 +/- 1 degrees C, 27 g/L). The results revealed that sunlight was the most significant inactivating factor (decrease of 3 Ulog within 48 hours for the two strains) compared to salinity and temperature (in darkness). Survival time of the strains was prolonged as they were maintained in darkness. Local strain (E. coli O55:B5) showed better survival capacity (T(90) = 52 hours) than E. coli O126:B16 (T(90) = 11 h). For both, modifications were noted only for some metabolic activities of carbohydrates hydrolysis. Cytotoxicity of the two strains, tested on Vero cell, was maintained during the period of survival. Water Environ. Res., 82, 2249 (2010). |
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English |
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1061-4303 |
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MARBEC @ isabelle.vidal-ayouba @ |
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864 |
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| Auteur |
Louati, H.; Ben Said, O.; Soltani, A.; Got, P.; Mahmoudi, E.; Cravo-Laureau, C.; Duran, R.; Aissa, P.; Pringault, O. |
| Titre |
The roles of biological interactions and pollutant contamination in shaping microbial benthic community structure |
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Article scientifique |
| Année |
2013 |
Publication |
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Revue Abrégée |
Chemosphere |
| Volume |
93 |
Numéro |
10 |
Pages |
2535-2546 |
| Mots-Clés |
Bioremediation; Meiofauna; Microcosms; PAH-degraders; bacteria; bizerte lagoon |
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0045-6535 |
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pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
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894 |
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| Auteur |
Louati, H.; Said, O.B.; Got, P.; Soltani, A.; Mahmoudi, E.; Cravo-Laureau, C.; Duran, R.; Aissa, P.; Pringault, O. |
| Titre |
Microbial community responses to bioremediation treatments for the mitigation of low-dose anthracene in marine coastal sediments of Bizerte lagoon (Tunisia) |
Type |
Article scientifique |
| Année |
2013 |
Publication |
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Revue Abrégée |
Environ Sci Pollut Res |
| Volume |
20 |
Numéro |
1 |
Pages |
300-310 |
| Mots-Clés |
Anthracene; Microbial communities; Microcosms; Oxygen microprofiles; T-RFLP analysis; bizerte lagoon |
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PURPOSE: The main goals of this study were to investigate (1) the behavior of microbial communities in response to low-dose bioavailable anthracene addition in lightly contaminated sediment from Bizerte Lagoon and (2) the effects of bioremediation treatments on microbial biomass, activity, and community structure. METHODS: Sediment microcosms amended with 1 ppm anthracene were incubated in triplicate during 30 days. Biostimulation (addition of nitrogen and phosphorus fertilizer) and bioaugmentation (inoculation of a hydrocarbonoclastic bacterium) were used as bioremediation treatments. Bacterial biomass was estimated using flow cytometry. Sediment oxygen consumption was measured with oxygen microelectrodes. Bacterial community structure was assessed by molecular fingerprints (terminal restriction fragment length polymorphism; T-RFLP) analysis. RESULTS: Anthracene contamination resulted in a significant reduction of bacterial abundance with an impact on cell integrity. Concomitantly, sediment oxygen consumption was strongly inhibited. Correspondence analysis on T-RFLP data indicated that bacterial community structures from anthracene-contaminated microcosms were different from that of the control. Interestingly, the changes observed in microbial biomass, structure, and activities as a result of anthracene contamination were not alleviated even with the use of biostimulation and combination of biostimulation and bioaugmentation strategy for anthracene bioremediation. Nevertheless, both treatment methods resulted in different community structures relative to the contaminated and control microcosms with the appearance of distinct populations. CONCLUSION: Anthracene spiking severely affected microbial communities, suggesting dominance of nontolerant populations in this lightly-contaminated sediment. Although biostimulation and/or bioaugmentation treatments did not alleviate the anthracene toxic effects, the changes observed in microbial population and structure suggest that the proposed treatments might be promising to promote bacterial growth. Further works are still required to propose a more efficient strategy to stimulate biodegradation that takes into account the complex interactions between species for resource access. |
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English |
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0944-1344 |
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MARBEC @ isabelle.vidal-ayouba @ |
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716 |
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| Auteur |
Pringault, O.; Lafabrie, C.; Avezac, M.; Bancon-Montigny, C.; Carré, C.; Chalghaf, M.; Delpoux, S.; Duvivier, A.; Elbaz-Poulichet, F.; Gonzalez, C.; Got, P.; Leboulanger, C.; Spinelli, S.; Hlaili, A.S.; Bouvy, M. |
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Consequences of contaminant mixture on the dynamics and functional diversity of bacterioplankton in a southwestern Mediterranean coastal ecosystem |
Type |
Article scientifique |
| Année |
2016 |
Publication |
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Revue Abrégée |
Chemosphere |
| Volume |
144 |
Numéro |
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Pages |
1060-1073 |
| Mots-Clés |
aquatic systems; Bacterial growth efficiency; Bacterial production; bizerte lagoon; Community level physiological profiles; growth efficiency; Herbicides; heterotrophic bacteria; Metals; microbial communities; Microcosms; organic-carbon; polycyclic aromatic-hydrocarbons; sediment resuspension; substrate utilization pattern; surface sediments |
| Résumé |
Contamination of coastal environments is often due to a complex mixture of pollutants, sometimes in trace levels, that may have significant effects on diversity and function of organisms. The aim of this study was to evaluate the short-term dynamics of bacterioplankton exposed to natural and artificial mixtures of contaminants. Bacterial communities from a southwestern Mediterranean ecosystem, lagoon and the bay (offshore) of Bizerte were exposed to i) elutriate from resuspension of contaminated sediment, and ii) an artificial mixture of metals and herbicides mimicking the contamination observed during sediment resuspension. Elutriate incubation as well as artificial spiking induced strong enrichments in nutrients (up to 18 times), metals (up to six times) and herbicides (up to 20 times) relative to the in situ concentrations in the offshore station, whereas the increases in contaminants were less marked in the lagoon station. In the offshore waters, the artificial mixture of pollutants provoked a strong inhibition of bacterial abundance, production and respiration and significant modifications of the potential functional diversity of bacterioplankton with a strong decrease of the carbohydrate utilization. In contrast, incubation with elutriate resulted in a stimulation of bacterial activities and abundances, suggesting that the toxic effects of pollutants were modified by the increase in nutrient and DOM concentrations due to the sediment resuspension. The effects of elutriate and the artificial mixture of pollutants on bacterial dynamics and the functional diversity were less marked in the lagoon waters, than in offshore waters, suggesting a relative tolerance of lagoon bacteria against contaminants. (C) 2015 Elsevier Ltd. All rights reserved. |
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English |
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0045-6535 |
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MARBEC @ isabelle.vidal-ayouba @ |
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1507 |
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Pringault, O.; Viret, H.; Duran, R. |
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Influence of microorganisms on the removal of nickel in tropical marine sediments (New Caledonia) |
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Article scientifique |
| Année |
2010 |
Publication |
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Revue Abrégée |
Marine Pollution Bulletin |
| Volume |
61 |
Numéro |
7–12 |
Pages |
530-541 |
| Mots-Clés |
Adsorption; Metal spiking; Microcosms; T-RFLP analysis |
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The removal of nickel in marine tropical sediments (New Caledonia) was studied in microcosms. Removal of Ni2+ was strongly enhanced by the presence of bacteria, with rates up to twofold higher than those observed under sterilized conditions. After 8 days of incubation, Ni2+ concentration in the water column ranged from 30% to 50% of the initial concentration according to sediment origin. Addition of glucose stimulated bacterial processes and resulted in a complete disappearance of Ni2+ in the water phase. Incubation under anoxic conditions slightly affects the microbial structure inferred from T-RFLP analysis irrespective of Ni2+ spiking, whereas incubation under oxic conditions resulted to moderate modification of the microbial structure, changes that might be more marked in the presence of Ni2+. Five different T-RFs were observed in almost all microcosms with relative abundance between 5% and 30%. Incubation with glucose resulted in the dominance of a common T-RF, with relative abundance up to 39%. |
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0025-326x |
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pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
685 |
| Lien permanent pour cet enregistrement |
