Biomineralisation of carbonate and sulphate by the halophilic bacterium Halomonas maura at different manganese concentrations

Almudena Rivadeneyra*, Alejandro Gonzalez-Martinez, Gabriela R. Portela, Daniel J. Martin-Ramos, Jesús Gonzalez-Lopez, María A. Rivadeneyra

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

The ability of Halomonas maura to bioprecipitate carbonate and sulphate crystals in solid media at different manganese concentrations has been demonstrated in this study for the first time. The precipitated minerals were studied by X-ray diffraction, scanning and transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The precipitated minerals were different based on the manganese concentration present in the medium and the incubation time. In the absence of manganese, H. maura formed pseudokutnahorite crystals; in the presence of manganese, the concentration in the culture medium determined the precipitation carbonates, such as rhodochrosite and dolomites. However, in the presence of low concentrations of manganese chloride (MnCl2) (5 g/l), kutnohorite crystals were also formed. Finally, when H. maura was grown in the presence of manganese, small amounts of sulphate crystals (such as bassanite and gypsum) were detected. Our study of the precipitated minerals showed an active role of H. maura in the biomineralisation process, but the geochemical conditions, and the manganese concentrations in particular, were clearly influential.

Original languageEnglish
Pages (from-to)1049-1056
Number of pages8
JournalExtremophiles
Volume21
Issue number6
Early online date10 Oct 2017
DOIs
Publication statusPublished - Nov 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Biomineralisation
  • Crystal formation
  • Halomonas maura
  • Halophiles
  • Manganese

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