Decontaminating Heavy Metals from Water Using Photosynthetic Microbes

Lefebvre, Daniel D.; Edwards, Chad D.

doi:10.1007/978-90-481-3352-9_3

Cited by 5 publications

(3 citation statements)

References 117 publications

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“…into tissues of aquatic organisms [46]. In a study about concentrations of heavy metal, copper and cadmium in a biological treatment system, they had negative effects on heterotrophic bacteria concentration [47]. Attempts were made to associate the proportion of heavy metals and traces in water with bacteria in gut microbiota of hexapods.…”

Section: Resultsmentioning

confidence: 99%

Gut Microbiota and Accumulation of Heavy Metals: A New Study of Water Scorpions (Hemiptera: Nepidae)

Bektaş¹

2022

Pol. J. Environ. Stud.

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This is a multidisciplinary study that examines the accumulation of heavy metals and gut microbiota in a water scorpion insect for the first time. Water scorpions can tolerate pollution to a certain extent. This investigation aimed to reveal some bacterial subspecies with biotechnological importance included within the gut structures of a water scorpion. The amount and purity of the isolated DNA was determined fluorometrically with 16s rRNA gene and amplified for use in species determination. The detected bacterial subspecies were as follows; list of bacteria in Nepa spp. gut microbiota. Additionally, some heavy metals were detected and evaluated. The correlation of heavy metals and bacteria, which are biotic elements of gut microbiota, in terms of environmental sustainability in indicator species was discussed. Indictor hemipterans in wetlands play important roles as ecosystem engineers to improve self-purification and promote elemental cycling. Therefore, our results will affect future studies about ecology.

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Section: Resultsmentioning

confidence: 99%

Gut Microbiota and Accumulation of Heavy Metals: A New Study of Water Scorpions (Hemiptera: Nepidae)

Bektaş¹

2022

Pol. J. Environ. Stud.

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“…A common mechanism for intracellular metal detoxification in living organisms is the formation of metal-binding peptides or proteins such as metallothioneins (Hamer, 1986;Grennan, 2011;Hassinen et al, 2011) and phytochelatins (Kondo et al, 1984;Gekeler et al, 1988;Kaplan et al, 1995;Hirata et al, 2005;Perales-Vela et al, 2006;Huang et al, 2009). For more details concerning the various types of metal-binding proteins and peptides in prokaryotic and eukaryotic microalgae, see reviews by Robinson (1989) and Lefebvre & Edwards (2010). Organic compounds such as malate, citrate, and polyphosphate were also reported as intracellular chelating agents (De Filippis & Pallaghy, 1994;Gasic & Korban, 2006;Perales-Vela et al, 2006).…”

Section: Microalgal Response To Heavy Metals Stressmentioning

confidence: 99%

Absorption and Adsorption of Heavy Metals by Microalgae

Kaplan

2013

Handbook of Microalgal Culture

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Heavy metals are released into waterways due to various anthropogenic activities. Their treatment is of special importance, since heavy metals are nonbiodegradable and persist in the environment posing a threat to the biota due to their toxic nature. In this chapter, the current methods that have been used to remove and/or detoxify heavy metals in aquatic environments are reviewed with specific emphasis on microalgae. A literature survey indicates microalgae have developed a wide spectrum of absorption (extracellular) and adsorption (intracellular) mechanisms for coping with heavy metal toxicity. The potential of prokaryotic and eukaryotic microalgae living cells or their dead cell biomass in comparison to currently available physicochemical processes aimed at removing toxic heavy metals is discussed. Also addressed are the mandatory requirements to bring this heavy metal removal potential to an applicable, commercial stage.

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“…Cyanobacteria are a particularly attractive group of bacteria for metal capture from aqueous media. − These photoautotrophs require only light, CO 2 , nitrogen, phosphate, and essential metal ions to thrive, and they are responsible for a substantial part of global CO 2 fixation . Interactions of cyanobacteria with many metal ions have been studied, − and it is thought that marine cyanobacteria play important roles for regulating the bioavailability of essential trace metal ions in seawater .…”

Section: Introductionmentioning

confidence: 99%

Unexpected Interactions of the Cyanobacterial Metallothionein SmtA with Uranium

Acharya

Blindauer

2016

Inorg. Chem.

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Molecules for remediating or recovering uranium from contaminated environmental resources are of high current interest, with protein-based ligands coming into focus recently. Metallothioneins either bind or redox-silence a range of heavy metals, conferring protection against metal stress in many organisms. Here, we report that the cyanobacterial metallothionein SmtA competes with carbonate for uranyl binding, leading to formation of heterometallic (UO2)(n)Zn4SmtA species, without thiol oxidation, zinc loss, or compromising secondary or tertiary structure of SmtA. In turn, only metalated and folded SmtA species were found to be capable of uranyl binding. (1)H NMR studies and molecular modeling identified Glu34/Asp38 and Glu12/C-terminus as likely adventitious, but surprisingly strong, bidentate binding sites. While it is unlikely that these interactions correspond to an evolved biological function of this metallothionein, their occurrence may offer new possibilities for designing novel multipurpose bacterial metallothioneins with dual ability to sequester both soft metal ions including Cu(+), Zn(2+), Cd(2+), Hg(2+), and Pb(2+) and hard, high-oxidation state heavy metals such as U(VI). The concomitant protection from the chemical toxicity of uranium may be valuable for the development of bacterial strains for bio-remediation.

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Decontaminating Heavy Metals from Water Using Photosynthetic Microbes

Cited by 5 publications

References 117 publications

Gut Microbiota and Accumulation of Heavy Metals: A New Study of Water Scorpions (Hemiptera: Nepidae)

Gut Microbiota and Accumulation of Heavy Metals: A New Study of Water Scorpions (Hemiptera: Nepidae)

Absorption and Adsorption of Heavy Metals by Microalgae

Unexpected Interactions of the Cyanobacterial Metallothionein SmtA with Uranium

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