Role of Various Microorganisms on Tc Behavior in Sediments
Abstract
Marine bacteria (Moraxella sp., Planococcus sp. and a mixed population of anaerobes) from a coastal sediment were found to concentrate Tc. Maximum concentration of this element occurred during the stationary phase of growth of the bacteria, at low redox potential. A metabolic process seems responsible for Tc concentration by bacteria, in which it binds to high molecular weight cellular constituents. Polysaccharidic polymers, which were visualized around the bacterial cells with the scanning electron microscope, might bind Tc, but direct experimental evidence in favor of this hypothesis was not yet obtained. The role of sedimentary bacteria in the behavior of Tc in the marine environment is briefly discussed. The action of sulfate-reducing microorganisms is considered.
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Although microbial metabolism was known to decrease the solubility of Tc from earlier studies, Lloyd and Macaskie were the first to unequivocally demonstrate direct enzymatic reduction of Tc(VII) by micro-organisms.
“Although microbial metabolism was known to decrease the solubility of Tc from earlier studies [129,130], Lloyd and Macaskie were the ¢rst to unequivocally demonstrate direct enzymatic reduction of Tc(VII) by micro-organisms [131].”
From Microbial reduction of metals and radionuclides (2003) · cites this paper as [130]
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Lovley, D. R. (1993) · Annual Review of Microbiology · doi:10.1146/annurev.mi.47.100193.001403 · Cited by 1,021 · see citing works
Microbial reduction of metals and radionuclides
Lloyd, J. R. (2003) · FEMS Microbiology Reviews · doi:10.1016/s0168-6445(03)00044-5 · Cited by 654 · see citing works
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“, metal sulfide formation) was also used to explain Tc accumulation by mixed cultures of anaerobic bacteria isolated from a marine sediment (37), but it was also proposed that Tc precipitation by oxygen-limited cultures of Moraxella and Planococcus spp.”
Icenhower, J. P., Qafoku, N. P., Zachara, J. M., & Martin, W. J. (2010) · American Journal of Science · doi:10.2475/08.2010.02 · Cited by 209 · see citing works
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Prakash, D., Gabani, P., Chandel, A. K., Ronen, Z., & Singh, O. V. (2013) · Microbial Biotechnology · doi:10.1111/1751-7915.12059 · Cited by 138 · see citing works
“The studies demonstrated reduction of Tc solubility (Henrot, 1989; Pignolet et al., 1989).”
BackgroundReduction of Actinides and Fission Products by Fe(III)-Reducing Bacteria
Lloyd, J. R., Chesnes, J., Glasauer, S., Bunker, D. J., Livens, F. R., & Lovley, D. R. (2002) · Geomicrobiology Journal · doi:10.1080/014904502317246200 · Cited by 132 · see citing works
“Although microbial metabolism was known to decrease the solubility of Tc from earlier studies (Henrot 1989; Pignolet et al. 1989), Lloyd and Macaskie (1996) were the rst to unequivocally demonstrate direct enzymatic reduction of Tc(VII) by microorganisms.”
BackgroundTechnetium reduction and precipitation by sulfate‐reducing bacteria
Lloyd, J. R., Nolting, H. ‐., Solé, V. A., Bosecker, K., & Macaskie, L. E. (1998) · Geomicrobiology Journal · doi:10.1080/01490459809378062 · Cited by 122 · see citing works
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“(36), who noted that control cultures containing heat-treated cells, or live cells incubated at 48C, concentrated significantly less Tc than cells incubated at 218C.”
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BackgroundResultMicroorganisms and migration of radionuclides in environment
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- Authors
- Pignolet, L., Auvray, F., Fonsny, K., Capot, F., & Moureau, Z.
- Affiliations
- UCLouvain (BE)
- Venue
- Health Physics
- Published
- 1989-11
- Volume
- 57
- Issue
- 5
- Pages
- 791-800
- ISSN
- 0017-9078 (ISSN-L)
- OpenAlex
- W1965439656
- Cited by
- 34
- References
- 0
- Citations by year
- 2021: 2 · 2020: 1 · 2019: 2 · 2017: 1 · 2015: 2 · 2014: 1 · 2013: 1 · 2012: 2
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Health Physics (publishedVersion)
- PubMed (publishedVersion)
- Digital Access to Libraries (submittedVersion)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
- Physical Sciences › Environmental Science › Global and Planetary Change › Radioactive contamination and transfer
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Chromium effects and bioremediation
- Keywords
- technetium, marine bacteria, sediment microorganisms, redox potential, bacterial growth phase, polysaccharide binding, Moraxella, Planococcus, anaerobic bacteria, sulfate-reducing bacteria
- MeSH terms
- Biodegradation, Environmental, Micrococcaceae, Moraxella, Seawater, Soil Pollutants, Soil Pollutants, Radioactive, Technetium, Temperature, Water Microbiology, Water Pollutants, Water Pollutants, Radioactive
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