Uranium Bio-Transformations: Chemical or Biological Processes?

Majumder, Erica L.-W.; Wall, Judy D.

doi:10.4236/ojic.2017.72003

Cited by 27 publications

(4 citation statements)

References 145 publications

(165 reference statements)

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“…Bacterial pili also seem to play a role as an electron conductor between the cells and the electron acceptors. The reduced U IV appears mainly localized in the periplasm and outside of the cells, indicating the involvement of outer membrane-bound enzymes in the reduction process ( Majumder and Wall, 2017 ). It has also been suggested that uranium reduction maybe linked to iron metabolism, since siderophores have been shown to form stable complexes with several metals and radionuclides, including uranium ( Gallois et al, 2022 ).…”

Section: Interaction Mechanisms Between Microorganisms and Relevant R...mentioning

confidence: 99%

Impact of microbial processes on the safety of deep geological repositories for radioactive waste

et al. 2023

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To date, the increasing production of radioactive waste due to the extensive use of nuclear power is becoming a global environmental concern for society. For this reason, many countries have been considering the use of deep geological repositories (DGRs) for the safe disposal of this waste in the near future. Several DGR designs have been chemically, physically, and geologically well characterized. However, less is known about the influence of microbial processes for the safety of these disposal systems. The existence of microorganisms in many materials selected for their use as barriers for DGRs, including clay, cementitious materials, or crystalline rocks (e.g., granites), has previously been reported. The role that microbial processes could play in the metal corrosion of canisters containing radioactive waste, the transformation of clay minerals, gas production, and the mobility of the radionuclides characteristic of such residues is well known. Among the radionuclides present in radioactive waste, selenium (Se), uranium (U), and curium (Cm) are of great interest. Se and Cm are common components of the spent nuclear fuel residues, mainly as 79Se isotope (half-life 3.27 × 105 years), 247Cm (half-life: 1.6 × 107 years) and 248Cm (half-life: 3.5 × 106 years) isotopes, respectively. This review presents an up-to-date overview about how microbes occurring in the surroundings of a DGR may influence their safety, with a particular focus on the radionuclide-microbial interactions. Consequently, this paper will provide an exhaustive understanding about the influence of microorganisms in the safety of planned radioactive waste repositories, which in turn might improve their implementation and efficiency.

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Section: Interaction Mechanisms Between Microorganisms and Relevant R...mentioning

confidence: 99%

Impact of microbial processes on the safety of deep geological repositories for radioactive waste

et al. 2023

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“…Reductive and nonreductive biomineralization are two forms of uranium biomineralization (Juan et al, 2014;Majumder and Wall, 2017;Newsome et al, 2014;Wufuer et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The feature of migration and deoxygenation of radionuclides U(Ⅵ) on genetically recombined bacteria W1

Shu,

Huang,

et al. 2024

Preprint

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Hoping resolve uranium release caused many harmful environmental impacts by genetic engineering bacteria, which is considered desirable and an innovative environmental-friendly water remediation strategy. Here, we report the great U deoxygenation potential of E. coli. DH5α W1 which was introduced the Dsr A gene of sulfate-reducing bacteria to strengthen its deoxygenation performance for deoxygenating U (VI) to U (IV) and reducing it’s toxic. In static adsorption, the bacteria will undergo a release phenomenon immediately after a super-adsorption stage, but the process of U(VI) deoxygenation was not affected. Through TEM, XPS and FTIR, infer feature of U(Ⅵ) how to migration and deoxygenation in the cell. The cells can reach up to 23.65 mmol of U per g of bacterial wet biomass through active biosorption to enrich U, at 90min, the U (IV) content in the bacteria can account for as high as 94% of the bio-immobilized U (VI). Results presented in this work will help to understand bioaccumulation characteristics better of strong deoxygenation bacteria and create an effective material to remove U.

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“…Under reducing conditions, U accumulation is driven by microbially mediated reduction of highly soluble U(VI) to much less soluble U(IV) (Bargar et al, 2013;Lefebvre et al, 2019). This reduction can be performed by sulfate-or metal-reducing bacteria (e.g., Desulfobacter and Desulfovibrio, or Geobacter and Shewanella, respectively), either through direct enzymatic action (Lovely et al, 1991;Lovely and Phillips, 1992;Majumder and Wall, 2017) or indirectly through the formation of reductants such as mackinawite (Boyanov et al, 2011;Bargar et al, 2013). Noël et al (2017bNoël et al ( , 2019 suggested that the onset of seasonal oxidizing conditions in TRZs could be fast enough to drive major changes in the chemical form and stability of U trapped within.…”

Section: Introductionmentioning

confidence: 99%

Stability of Floodplain Subsurface Microbial Communities Through Seasonal Hydrological and Geochemical Cycles

et al. 2020

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Riparian floodplains represent an interaction zone between the terrestrial subsurface and rivers, where regional groundwater flows, infiltration, and evapotranspiration drive mixing of water and import/export of nutrients and contaminants. These dynamics create seasonally transient redox conditions that drive biogeochemical transformations, which strongly modify groundwater quality. Microbial responses to changing hydrological conditions are perhaps the critical step connecting hydrology to geochemical transformations and groundwater quality, yet are not well understood. We aimed to address this knowledge gap by monitoring seasonal transitions at the United States Department of Energy legacy uranium ore processing site in Riverton, WY, through spring-summer-fall hydrological transitions. Our goal was to characterize the microbial community throughout the soil profile, down to the saturated aquifer, and observe its response to wet-dry transitions across a full season and compare to changes in geochemistry and hydrology. Next-generation sequencing was employed to identify biogeochemically relevant microbial taxa based on the 16S rRNA gene; we found a broad diversity of microbial clades including taxa involved in sulfur and metal cycling, as well as nitrification. These data were paired with measurements of soil moisture, major nutrients and cations, and trace elements. Overall microbial community composition was dependent on soil depth or type, with seasonal effects only observed in the topsoil or subsurface aquifer. This finding indicates that microbial communities in the transiently reduced center of the soil profile at the Riverton, WY site are remarkably stable, despite moisture and redox inversions. In addition, these communities likely impact the communities in surrounding soil horizons through export of metabolites and solutes as the water table rises and falls throughout the season.

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Uranium Bio-Transformations: Chemical or Biological Processes?

Cited by 27 publications

References 145 publications

Impact of microbial processes on the safety of deep geological repositories for radioactive waste

Impact of microbial processes on the safety of deep geological repositories for radioactive waste

The feature of migration and deoxygenation of radionuclides U(Ⅵ) on genetically recombined bacteria W1

Stability of Floodplain Subsurface Microbial Communities Through Seasonal Hydrological and Geochemical Cycles

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