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Related Concept Videos

Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...

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An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
09:33

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium

Published on: December 17, 2018

A structural study of cadmium interaction with aquatic microorganisms.

Oleg S Pokrovsky1, Gleb S Pokrovski, Agnes Feurtet-Mazel

  • 1Laboratoire des Mécanismes et Transferts en Géologie (LMTG), UMR 5563, CNRS-OMP-Université Toulouse, 14 Avenue Edouard Belin, 31400 Toulouse, France. oleg@lmtg.obs-mip.fr

Environmental Science & Technology
|August 30, 2008
PubMed
Summary

Cadmium binds to carboxylate groups on freshwater algae and cyanobacteria. Marine algae and bacteria bind cadmium via sulfur-containing groups, impacting metal bioavailability.

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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
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Published on: July 13, 2016

Area of Science:

  • Environmental Chemistry
  • Aquatic Microbiology
  • Biogeochemistry

Background:

  • Cadmium (Cd) is a toxic heavy metal pollutant.
  • Understanding Cd interactions with aquatic life is crucial for environmental risk assessment.
  • Phototrophic microorganisms play key roles in aquatic ecosystems.

Purpose of the Study:

  • To investigate the molecular mechanisms of cadmium toxicity in aquatic phototrophic microorganisms.
  • To determine the speciation of cadmium adsorbed on cell surfaces and taken up during growth.
  • To compare cadmium binding in freshwater and marine species.

Main Methods:

  • Batch macroscopic experiments.
  • In situ Cd K-edge X-ray absorption fine structure (XAFS) spectroscopy.
  • Analysis of freshwater diatoms, cyanobacteria, marine diatoms, anoxygenic bacteria, and biofilms.

Main Results:

  • In freshwater diatoms and cyanobacteria, short-term Cd adsorption involves octahedral coordination with oxygen (Cd-O) at carboxylate groups.
  • Long-term Cd uptake in freshwater diatoms shows similar Cd-O bonding.
  • Marine diatoms and anoxygenic bacteria exhibit Cd coordination with oxygen/nitrogen and sulfur atoms, indicating Cd-thiolate complex formation.

Conclusions:

  • Cadmium binding mechanisms differ significantly between freshwater and marine phototrophic microorganisms.
  • The association of Cd with sulfhydryl groups in marine species is a key factor influencing cadmium bioavailability.
  • These findings aid in assessing the environmental impact of cadmium in aquatic systems.