Metal resistance mechanisms in Gram-negative bacteria and their potential to remove Hg in the presence of other metals

Giovanella, Patrícia; Cabral, Lucélia; Costa, Alexandre Pereira; Camargo, Flávio Anastácio de Oliveira; Gianello, Clésio; Bento, Fátima Menezes

doi:10.1016/j.ecoenv.2017.02.010

Cited by 97 publications

(37 citation statements)

References 53 publications

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“…Furthermore, DC‐B2 also displayed considerable resistance to Cr 6+ , Cu 2+ , Zn 2+ , Pb 2+ and As 3+ , with corresponding MICs of 350.0, 159.8, 104.1, 265.2 and 99.9 mg L −1 , and EC 50 values of 299.7, 107.9, 48.5, 205.5 and 63.2 mg L −1 , respectively (Table ). These results suggested that this strain has the potential to be used for the remediation of Hg‐contaminated sites with complex metal contaminants …”

Section: Resultsmentioning

confidence: 88%

“…These results suggested that this strain has the potential to be used for the remediation of Hg-contaminated sites with complex metal contaminants. 19,34 An important parameter affecting microbial growth and metabolism, including Hg removal, is the pH of the surrounding environment. 19,20 Satisfactory growth of DC-B2 was observed over a wide range of pH values (5.0-9.0; P > 0.05), and the optimal growth was observed at pH 6.0-7.0 (Supporting Information, Fig.…”

Section: Identification Of Dc-b2mentioning

confidence: 99%

“…strains could remove > 80% of the Hg in LB broth containing 10 mg L −1 HgCl 2 , and almost no Hg accumulated in the bacterial cells, suggesting that bacterial reduction and volatilization were responsible for the removal. Giovanella et al 34 reported that Hg-resistant Pseudomonas sp. and Alcaligenes faecalis isolates removed c.90% of the Hg in LB medium containing 10 μmol L −1 of HgCl 2 in 24 h, primarily through volatilization.…”

Section: Removal Of Hg(ii) In Culture Solution By Dc-b2mentioning

confidence: 99%

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Isolation of the Hg(II)‐volatilizing Bacillus sp. strain DC‐B2 and its potential to remediate Hg(II)‐contaminated soils

Chen

Dong

Shen

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Mercury (Hg) contamination is a major global environmental problem, and its remediation using environmentally friendly biotechnologies has attracted increasing attention. In this study, an Hg(II)‐resistant bacterial strain, Bacillus sp. DC‐B2, was isolated from a metal‐contaminated site, and its ability to remediate five types of Hg‐contaminated soils was investigated. RESULTS The isolate DC‐B2 showed strong resistance to multiple metals and volatilized 91.6% of the Hg(II) in a culture with an initial Hg(II) concentration of 10 mg L−1 within 8 h. Microcosm experiments showed that the addition of DC‐B2 culture improved Hg(II) removal by 11.7–17.2% from four artificially Hg(II)‐spiked soil samples with initial Hg contents of approximately 100 mg kg−1 after incubating for 30 days under flooded conditions compared to the control treatment. For the field‐contaminated farmland soil containing 2.50 mg Hg kg−1, an Hg(II) elimination rate of 82.1% was achieved within 30 days with the DC‐B2 inoculation, relative to the 34.1% elimination rate observed for the uninoculated control. The amendment of peptone broth slightly inhibited Hg removal (2.2–8.7%). The remediation effectiveness was verified by observations of longer root and shoot lengths of lettuce plants grown in treated soils compared to those grown in the control soil. CONCLUSION The isolate Bacillus sp. DC‐B2 shows great potential to be developed as a bioagent for effective bioremediation of Hg‐contaminated soils. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 88%

Section: Identification Of Dc-b2mentioning

confidence: 99%

Section: Removal Of Hg(ii) In Culture Solution By Dc-b2mentioning

confidence: 99%

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Isolation of the Hg(II)‐volatilizing Bacillus sp. strain DC‐B2 and its potential to remediate Hg(II)‐contaminated soils

Chen

Dong

Shen

et al. 2019

J of Chemical Tech & Biotech

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“…The chemical structure and solubility of Al are influenced by such environmental factors as pH. At pH below neutral, Al is in an insoluble state as Al(OH) 3 . Because of the acidification process, Al(OH) 3 changes to dissolved ions such as Al(OH) 4 -, Al(OH) 2 + , AlOH +2 , and Al +3 .…”

Section: Introductionmentioning

confidence: 99%

“…This biological method can be an alternative because it is relatively cheap, environmentally friendly, and provides considerable removal efficiency. Some microorganisms can adapt to contaminants and have a resistance system (Giovanell et al, 2017). Bacteria are microorganisms that have the ability to withstand the presence of metals at certain concentrations (Purwanti et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Removal of Aluminium in Contaminated Soil using Locally Isolated Vibrio alginolyticus

Purwanti¹,

Kurniawan²,

Simanjuntak³

2019

J. Ecol. Eng.

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The aluminium contaminated soil is currently being a concern due to the use of aluminium waste as a material for building roads and river dams in Jombang District, Jawa Timur Province, Indonesia. This application was debated because aluminium waste is categorized as hazardous waste. One widely known method for treating the metal contaminated soil is bioremediation. One potential indigenous bacterial species to remove aluminium, Vibrio alginolyticus was isolated from contaminated soil. A toxicity test to V. alginolyticus showed that this bacterium could grow in aluminium contaminated soil until 100 mg/L equal to 48 mg/kg concentration. The removal of aluminium from soil was conducted by using 50 and 100 mg/L concentration. The result showed that the addition of 2% v/v of V. alginolyticus can remove 5.48% aluminium from 100mg/L contaminated soil initial concentration after 12 days of test period. The addition of V. alginolyticus did not significantly influence the removal of aluminium from contaminated soil (p>0.05).

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Arsenic and Mercury Distribution in an Aquatic Food Chain: Importance of Femtoplankton and Picoplankton Filtration Fractions

Alowaifeer

Clingenpeel

Kan

et al. 2022

Enviro Toxic and Chemistry

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Arsenic (As) and mercury (Hg) were examined in the Yellowstone Lake food chain, focusing on two lake locations separated by approximately 20 km and differing in lake floor hydrothermal vent activity. Sampling spanned from femtoplankton to the main fish species, Yellowstone cutthroat trout and the apex predator lake trout. Mercury bioaccumulated in muscle and liver of both trout species, biomagnifying with age, whereas As decreased in older fish, which indicates differential exposure routes for these metal(loid)s. Mercury and As concentrations were higher in all food chain filter fractions (0.1‐, 0.8‐, and 3.0‐μm filters) at the vent‐associated Inflated Plain site, illustrating the impact of localized hydrothermal inputs. Femtoplankton and picoplankton size biomass (0.1‐ and 0.8‐μm filters) accounted for 30%–70% of total Hg or As at both locations. By contrast, only approximately 4% of As and <1% of Hg were found in the 0.1‐μm filtrate, indicating that comparatively little As or Hg actually exists as an ionic form or intercalated with humic compounds, a frequent assumption in freshwaters and marine waters. Ribosomal RNA (18S) gene sequencing of DNA derived from the 0.1‐, 0.8‐, and 3.0‐μm filters showed significant eukaryote biomass in these fractions, providing a novel view of the femtoplankton and picoplankton size biomass, which assists in explaining why these fractions may contain such significant Hg and As. These results infer that femtoplankton and picoplankton metal(loid) loads represent aquatic food chain entry points that need to be accounted for and that are important for better understanding Hg and As biochemistry in aquatic systems. Environ Toxicol Chem 2023;42:225–241. © 2022 SETAC

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Metal resistance mechanisms in Gram-negative bacteria and their potential to remove Hg in the presence of other metals

Cited by 97 publications

References 53 publications

Isolation of the Hg(II)‐volatilizing Bacillus sp. strain DC‐B2 and its potential to remediate Hg(II)‐contaminated soils

Isolation of the Hg(II)‐volatilizing Bacillus sp. strain DC‐B2 and its potential to remediate Hg(II)‐contaminated soils

Removal of Aluminium in Contaminated Soil using Locally Isolated Vibrio alginolyticus

Arsenic and Mercury Distribution in an Aquatic Food Chain: Importance of Femtoplankton and Picoplankton Filtration Fractions

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