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    Use of Bacteria To Stabilize Archaeological Iron

    Comensoli, Lucrezia, Maillard, Julien, Albini, Monica, Sandoz, Frederic, Junier, Pilar, Joseph, Edith
    Applied and environmental microbiology, 01 May 2017, Vol.83(9) [Revue évaluée par les pairs]

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    Interaction between microbes, iron and chlorine for the development of biotechnological approaches to stabilize corroded iron

    Comensoli, Lucrezia
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    Soluble and solid iron reduction assays with Desulfitobacterium hafniense

    Comensoli, Lucrezia, Maillard, Julien, Kooli, Wafa M, Junier, Pilar, Joseph, Edith
    Bio-protocol. - 2018, Vol. 8, iss 17
    2018-09
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    Titre: Soluble and solid iron reduction assays with Desulfitobacterium hafniense
    Contributeur: Comensoli, Lucrezia; Maillard, Julien; Kooli, Wafa M; Junier, Pilar; Joseph, Edith
    Date: 2018-09
    Sujet: Biogenic minerals - Conservation - Restauration - scientifique
    Description: There is a pressing need to develop sustainable and efficient methods to protect and stabilize iron objects. To develop a conservation-restoration method for corroded iron objects, this bio-protocol presents the steps to investigate reductive dissolution of ferric iron and biogenic production of stabilizing ferrous iron minerals in the strict anaerobe Desulfitobacterium hafniense (strains TCE1 and LBE). We investigated iron reduction using three different Fe(III) sources: Fe(III)-citrate (a soluble phase), akaganeite (solid iron phase), and corroded coupons. This protocol describes a method that combines spectrophotometric quantification of the complex Fe(II)-Ferrozine® with mineral characterization by scanning electron microscopy and Raman spectroscopy. These three methods allow assessing reductive dissolution of ferric iron and biogenic mineral production as a promising alternative for the development of an innovative sustainable method for the stabilization of corroded iron.
    Publication en relation: Bio-protocol. - 2018, Vol. 8, iss 17
    Document hôte: Bio-protocol
    Identifiant: 2331-8325 (ISSN); 10.21769/BioProtoc.3002 (DOI)

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    Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects

    Kooli, Wafa M, Comensoli, Lucrezia, Maillard, Julien, Albini, Monica, Gelb, Arnaud, Junier, Pilar, Joseph, Edith
    Scientific reports. - vol. 8, 2018, n° 764, pp.
    2018-01
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    Titre: Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects
    Contributeur: Kooli, Wafa M; Comensoli, Lucrezia; Maillard, Julien; Albini, Monica; Gelb, Arnaud; Junier, Pilar; Joseph, Edith
    Date: 2018-01
    Collation: 11 p.
    Sujet: corrosion - iron - heritage materials - stabilisation - Conservation - Restauration - scientifique
    Description: Exploiting bacterial metabolism for the stabilisation of corroded iron artefacts is a promising alternative to conventional conservation-restoration methods. Bacterial iron reduction coupled to biogenic mineral formation has been shown to promote the conversion of reactive into stable corrosion products that are integrated into the natural corrosion layer of the object. However, in order to stabilise iron corrosion, the formation of specific biogenic minerals is essential. In this study, we used the facultative anaerobe Shewanella loihica for the production of stable biogenic iron minerals under controlled chemical conditions. The biogenic formation of crystalline iron phosphates was observed after iron reduction in a solution containing Fe(III) citrate. When the same biological treatment was applied on corroded iron plates, a layer composed of iron phosphates and iron carbonates was formed. Surface and cross-section analyses demonstrated that these two stable corrosion products replaced 81% of the reactive corrosion layer after two weeks of treatment. Such results demonstrate the potential of a biological treatment in the development of a stabilisation method to preserve corroded iron objects.
    Publication en relation: Scientific reports. - vol. 8, 2018, n° 764, pp.
    Document hôte: Scientific reports
    Identifiant: 2045-2322 (ISSN); 10.1038/s41598-017-19020-3 (DOI)

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    Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects

    Kooli, Wafa M
    Comensoli, Lucrezia, Maillard, Julien, Albini, Monica, Gelb, Arnaud, Junier, Pilar, Joseph, Edith
    Scientific Reports. - 2018/8/# 764/1-11
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    Titre: Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects
    Auteur: Kooli, Wafa M
    Contributeur: Comensoli, Lucrezia; Maillard, Julien; Albini, Monica; Gelb, Arnaud; Junier, Pilar; Joseph, Edith
    Description: Exploiting bacterial metabolism for the stabilisation of corroded iron artefacts is a promising alternative to conventional conservation-restoration methods. Bacterial iron reduction coupled to biogenic mineral formation has been shown to promote the conversion of reactive into stable corrosion products that are integrated into the natural corrosion layer of the object. However, in order to stabilise iron corrosion, the formation of specific biogenic minerals is essential. In this study, we used the facultative anaerobe Shewanella loihica for the production of stable biogenic iron minerals under controlled chemical conditions. The biogenic formation of crystalline iron phosphates was observed after iron reduction in a solution containing Fe(III) citrate. When the same biological treatment was applied on corroded iron plates, a layer composed of iron phosphates and iron carbonates was formed. Surface and cross-section analyses demonstrated that these two stable corrosion products replaced 81% of the reactive corrosion layer after two weeks of treatment. Such results demonstrate the potential of a biological treatment in the development of a stabilisation method to preserve corroded iron objects.
    Publication en relation: Scientific Reports. - 2018/8/# 764/1-11
    Document hôte: Scientific Reports
    Identifiant: 10.1038/s41598-017-19020-3 (DOI)

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    Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects

    Kooli, Wafa M, Comensoli, Lucrezia, Maillard, Julien, Albini, Monica, Gelb, Arnaud, Junier, Pilar, Joseph, Edith
    Scientific reports, 15 January 2018, Vol.8(1), pp.764 [Revue évaluée par les pairs]

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    The Potential of Microorganisms for the Conservation- Restoration of Iron Artworks

    Comensoli, Lucrezia, Kooli, Wafa, Monachon, Mathilde, Albini, Monica, Junier, Pilar, Joseph, Edith, Metal 2019, 9th interim meeting of the ICOM-CC metals working group Neuchâtel, Switzerland 2019-09-02
    Neuchâtel, Switzerland : 2-6 september 2019
    Metal 2019, 9th interim meeting of the ICOM-CC metals working group
    2019-09
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    Titre: The Potential of Microorganisms for the Conservation- Restoration of Iron Artworks
    Contributeur: Comensoli, Lucrezia; Kooli, Wafa; Monachon, Mathilde; Albini, Monica; Junier, Pilar; Joseph, Edith; Metal 2019, 9th interim meeting of the ICOM-CC metals working group Neuchâtel, Switzerland 2019-09-02
    Editeur: Neuchâtel, Switzerland : 2-6 september 2019
    Date: 2019-09
    Collation: 9 p.
    Sujet: Culture heritage - Iron - Corrosion - Microorganisms - Biogenic minerals - Stabilisation - Bio-cleaning - Green chemistry - Conservation - Restauration - full paper
    Description: Archaeological iron artefacts encounter serious post-excavation problems when contaminated with salts. Once excavated, exposure to a higher oxygen concentration and lower relative humidity renders the corrosion crust formed during burial no longer stable. In particular, the process is induced by chloride ions and leads to flaking, cracking and the final loss of shape of the object. The MAIA project (Microbes for Archaeological Iron Artefacts) studied microbial metabolisms to explore their potential for the development of innovative and sustainable methods for the stabilisation of corroded iron archaeological objects. Two different approaches were investigated. First, bacterial reduction of iron solid-phases and biogenic mineral formation were studied as a way to replace unstable corrosion products. Several bacterial strains were compared. Spectroscopic investigations with Raman and Fourier transform infrared spectroscopy on iron coupons, nail surfaces and cross sections demonstrated the conversion of the outermost part of the corrosion layer into more stable biogenic minerals, such as vivianite and siderite. The second approach was to study fungi and their metabolic ability with iron. In particular, alkaliphile fungi that tolerate chlorine were studied for their ability to produce biogenic minerals and to adsorb metals in their biomass. Colorimetric investigation and evaluation of the thickness of the corrosion layer demonstrated that fungi are good candidates for developing bio-cleaning methods for corroded iron, permitting the selective removal of the unstable and powdery corrosion layer without damaging the original metal surface. This study details these approaches and explores the possibilities of their exploitation for development of innovative and more sustainable treatments for the conservation-restoration of corroded iron.
    Publication en relation: Metal 2019, 9th interim meeting of the ICOM-CC metals working group
    Document hôte: Metal 2019, 9th interim meeting of the ICOM-CC metals working group

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    The "Plastisphere" of Biodegradable Plastics Is Characterized by Specific Microbial Taxa of Alpine and Arctic Soils

    Ra1, Bolsterli, Damian, Pardi-Comensoli, Lucrezia, Brunner, Ivano, Frey, Beat
    Frontiers in Environmental Science, Sept 24, 2020 [Revue évaluée par les pairs]

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    Investigation of Biogenic Passivating Layers on Corroded Iron

    Comensoli, Lucrezia, Albini, Monica, Kooli, Wafa, Maillard, Julien, Lombardo, Tiziana, Junier, Pilar, Joseph, Edith
    Materials (Basel, Switzerland), 06 March 2020, Vol.13(5) [Revue évaluée par les pairs]