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Title: Remedial Treatment of Corroded Iron Objects by Environmental Aeromonas Isolates

Journal Article · · Applied and Environmental Microbiology
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [5];  [2];  [3];  [3];  [7];  [6];  [6];  [5];  [3];  [8];  [9]
  1. University of Neuchâtel (Switzerland). Laboratory of Microbiology, Institute of Biology; University of Neuchâtel (Switzerland). Laboratory of Technologies for Heritage Materials, Institute of Chemistry; DOE/OSTI
  2. University of Neuchâtel (Switzerland). Laboratory of Microbiology, Institute of Biology
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Bioscience Division
  4. University of Neuchâtel (Switzerland). Laboratory of Technologies for Heritage Materials, Institute of Chemistry
  5. Centre Suisse d'Electronique et de Microtechnique, Neuchâtel (Switzerland)
  6. NVENesis, Neuchâtel (Switzerland)
  7. ADMED Microbiologie, La Chaux-de-Fonds (Switzerland)
  8. University of Neuchâtel, Neuchâtel (Switzerland). Laboratory of Technologies for Heritage Materials, Institute of Chemistry; Haute École Spécialisée de Suisse Occidentale, Neuchâtel (Switzerland). Haute Ecole Arc Conservation-Restauration
  9. University of Neuchâtel, Neuchâtel (Switzerland). Laboratory of Microbiology, Institute of Biology

Using bacteria to transform reactive corrosion products into stable compounds represents an alternative to traditional methodsployed in iron conservation. Two environmental Aeromonas strains (CA23 and CU5) were used to transform ferric iron corrosion products (goethite and lepidocrocite) into stable ferrous iron-bearing minerals (vivianite and siderite). A genomic and transcriptomic approach was used to analyze the metabolic traits of these strains and to evaluate their pathogenic potential. Although genes involved in solid-phase iron reduction were identified, key genes present in other environmental iron-reducing species are missing from the genome of CU5. Several pathogenicity factors were identified in the genomes of both strains, but none of these was expressed under iron reduction conditions. Additional in vivo tests showed hemolytic and cytotoxic activities for strain CA23 but not for strain CU5. Both strains were easily inactivated using ethanol and heat. Nonetheless, given a lesser potential for a pathogenic lifestyle, CU5 is the most promising candidate for the development of a bio-based iron conservation method stabilizing iron corrosion. Based on all the results, a prototype treatment was established using archaeological items. On those, the conversion of reactive corrosion products and the formation of a homogenous layer of biogenic iron minerals were achieved. This study shows how naturally occurring microorganisms and their metabolic capabilities can be used to develop bio-inspired solutions to the problem of metal corrosion.

Research Organization:
Los Alamos National Lab., NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1626067
Journal Information:
Applied and Environmental Microbiology, Journal Name: Applied and Environmental Microbiology Journal Issue: 3 Vol. 85; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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