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Bacterial tactic response to silver nanoparticles.

José-Julio Ortega-Calvo1, Rodrigo Molina, Celia Jimenez-Sanchez

  • 1Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), C.S.I.C., Apartado 1052, E-41080-Seville, Spain.

Environmental Microbiology Reports
|June 14, 2013
PubMed
Summary
This summary is machine-generated.

Silver nanoparticles (AgNPs) trigger a repellent tactic response in soil bacteria at low, environmentally relevant concentrations. This bacterial avoidance behavior differs from silver ion toxicity, suggesting unique nano-silver interaction mechanisms.

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Area of Science:

  • Environmental Microbiology
  • Nanotoxicology
  • Bacterial Physiology

Background:

  • Soil bacteria play crucial roles in ecosystem functions.
  • Silver nanoparticles (AgNPs) are increasingly used, raising environmental concerns.
  • Understanding nanoparticle-bacterial interactions is vital for risk assessment.

Purpose of the Study:

  • To investigate the tactic response of Pseudomonas putida G7 to silver nanoparticles (AgNPs).
  • To differentiate between AgNP-induced repellent responses and general toxicity.
  • To explore the mechanisms of nano-silver interaction with bacteria.

Main Methods:

  • Characterization of AgNP size and surface area.
  • Toxicity assessment via ATP production.
  • Repellent response evaluation using inverted capillary assays ('chemical-in-pond').
  • Motility behavior analysis using computer-assisted motion tracking.

Main Results:

  • Low, sublethal AgNP concentrations (0.1 mg/L) induced a significant repellent tactic response in P. putida.
  • AgNPs caused increased bacterial turning events, indicative of repellent behavior.
  • Silver nitrate (AgNO3) did not elicit a repellent response, despite causing comparable toxicity and inhibiting motility at higher concentrations.

Conclusions:

  • Nanoparticles can induce specific negative tactic responses in bacteria at environmentally relevant concentrations.
  • The repellent mechanism of nano-silver appears distinct from the ion-mediated toxicity of dissolved silver.
  • This suggests unique interaction pathways for nano-scale silver influencing bacterial behavior.