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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Lloyd, Jonathan R.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (27/27 displayed)
- 2023An investigation into the role of c-type cytochromes and extracellular flavins in the bioreduction of uranyl(VI) by <i>Shewanella oneidensis</i> using fluorescence spectroscopy and microscopycitations
- 2023Anaerobic biodegradation of citric acid in the presence of Ni and U at alkaline pH; impact on metal fate and speciationcitations
- 2023Copper bioreduction and nanoparticle synthesis by an enrichment culture from a former copper minecitations
- 2020Biomineralization of Cu2S nanoparticles by Geobacter sulfurreducenscitations
- 2020Enhanced microbial degradation of irradiated cellulose under hyperalkaline conditionscitations
- 2019Bioelectrochemical treatment and recovery of copper from distillery waste effluents using power and voltage control strategiescitations
- 2018Combined chemical and microbiological degradation of tetrachloroethene during the application of Carbo-Iron at a contaminated field sitecitations
- 2018Response of Bentonite Microbial Communities to Stresses Relevant to Geodisposal of Radioactive Wastecitations
- 2018A Novel Adaptation Mechanism Underpinning Algal Colonization of a Nuclear Fuel Storage Pondcitations
- 2018Biosynthesis and Characterization of Copper Nanoparticles Using Shewanella oneidensis: Application for Click Chemistrycitations
- 2016Bacterial Diversity in the Hyperalkaline Allas Springs (Cyprus), a Natural Analogue for Cementitious Radioactive Waste Repositorycitations
- 2016Imaging the hydrated microbe-metal interface using nanoscale spectrum imagingcitations
- 2016Biogenic methane in shale gas and coal bed methanecitations
- 2015Microbial degradation of cellulosic material under intermediate-level waste simulated conditionscitations
- 2014The Impact of γ Radiation on the Bioavailability of Fe(III) Minerals for Microbial Respirationcitations
- 2014Biosynthesis of zinc substituted magnetite nanoparticles with enhanced magnetic propertiescitations
- 2014Biosynthesis of zinc substituted magnetite nanoparticles with enhanced magnetic propertiescitations
- 2014An Electrochemical Study of the Influence of Marinobacter aquaeolei on the Alteration of Hydrothermal Chalcopyrite (CuFeS2) and Pyrite (FeS2) under Circumneutral Conditionscitations
- 2011Geochemical and microbial controls of the decomposition of depleted uranium in the environment: Experimental studies using soil microorganismscitations
- 2010Phenotypic characterization of shewanella oneidensis MR-1 under aerobic and anaerobic growth conditions by using fourier transform infrared spectroscopy and high-performance liquid chromatography analysescitations
- 2010Impact of silver(I) on the metabolism of Shewanella oneidensiscitations
- 2009Harnessing the extracellular bacterial production of nanoscale cobalt ferrite with exploitable magnetic propertiescitations
- 2009Harnessing the extracellular bacterial production of nanoscale cobalt ferrite with exploitable magnetic propertiescitations
- 2008Biomineralization: Linking the fossil record to the production of high value functional materialscitations
- 2007Time-resolved synchrotron X-ray powder diffraction study of biogenic nanomagnetitecitations
- 2005Reduction of uranium(VI) phosphate during growth of the thermophilic bacterium Thermoterrabacterium ferrireducenscitations
- 2005Developments in bioremediation of soils and sediments polluted with metals and radionuclides: 2. Field research on bioremediation of metals and radionuclidescitations
Places of action
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article
A Novel Adaptation Mechanism Underpinning Algal Colonization of a Nuclear Fuel Storage Pond
Abstract
<p>Geochemical analyses alongside molecular techniques were used to characterize the microbial ecology and biogeochemistry of an outdoor spent nuclear fuel storage pond at Sellafield, United Kingdom, that is susceptible to seasonal algal blooms that cause plant downtime. 18S rRNA gene profiling of the filtered biomass samples showed the increasing dominance of a species closely related to the alga Haematococcus pluvialis, alongside 16S rRNA genes affiliated with a diversity of freshwater bacteria, including Proteobacteria and Cyanobacteria. High retention of<sup>137</sup> Cs and<sup>90</sup> Sr on pond water filters coincided with high levels of microbial biomass in the pond, suggesting that microbial colonization may have an important control on radionuclide fate in the pond. To interpret the unexpected dominance of Haematococcus species during bloom events in this extreme environment, the physiological response of H. pluvialis to environmentally relevant ionizing radiation doses was assessed. Irradiated laboratory cultures produced significant quantities of the antioxidant astaxanthin, consistent with pigmentation observed in pond samples. Fourier transform infrared (FT-IR) spectroscopy suggested that radiation did not have a widespread impact on the metabolic fingerprint of H. pluvialis in laboratory experiments, despite the 80-Gy dose. This study suggests that the production of astaxanthin-rich encysted cells may be related to the preservation of the Haematococcus phenotype, potentially allowing it to survive oxidative stress arising from radiation doses associated with the spent nuclear fuel. The oligotrophic and radiologically extreme conditions in this environment do not prevent extensive colonization by microbial communities, which play a defining role in controlling the biogeochemical fate of major radioactive species present. IMPORTANCE Spent nuclear fuel is stored underwater in large ponds prior to processing and disposal. Such environments are intensively radioactive but can be colonized by microorganisms. Colonization of such inhospitable radioactive ponds is surprising, and the survival mechanisms that microbes use is of fundamental interest. It is also important to study these unusual ecosystems, as microbes growing in the pond waters may accumulate radionuclides present in the waters (for bioremediation applications), while high cell loads can hamper management of the ponds due to poor visibility. In this study, an outdoor pond at the U.K. Sellafield facility was colonized by a seasonal bloom of microorganisms, able to accumulate high levels of<sup>137</sup> Cs and<sup>90</sup> Sr and dominated by the alga Haematococcus. This organism is not normally associated with deep water bodies, but it can adapt to radioactive environments via the production of the pigment astaxanthin, which protects the cells from radiation damage.</p>