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Nucleation of Fe-rich phosphates and carbonates on microbial cells and exopolymeric substances.

Sánchez-Román M, Puente-Sánchez F, Parro V, Amils R - Front Microbiol (2015)

Bottom Line: Although phosphate and carbonate are important constituents in ancient and modern environments, it is not yet clear their biogeochemical relationships and their mechanisms of formation.Microbially mediated carbonate formation has been widely studied whereas little is known about the formation of phosphate minerals.Here we report that a new bacterial strain, Tessarococcus lapidicaptus, isolated from the subsurface of Rio Tinto basin (Huelva, SW Spain), is capable of precipitating Fe-rich phosphate and carbonate minerals.

View Article: PubMed Central - PubMed

Affiliation: Department of Planetology and Habitability, Centro de Astrobiología (INTA-CSIC) Madrid, Spain.

ABSTRACT
Although phosphate and carbonate are important constituents in ancient and modern environments, it is not yet clear their biogeochemical relationships and their mechanisms of formation. Microbially mediated carbonate formation has been widely studied whereas little is known about the formation of phosphate minerals. Here we report that a new bacterial strain, Tessarococcus lapidicaptus, isolated from the subsurface of Rio Tinto basin (Huelva, SW Spain), is capable of precipitating Fe-rich phosphate and carbonate minerals. We observed morphological differences between phosphate and carbonate, which may help us to recognize these minerals in terrestrial and extraterrestrial environments. Finally, considering the scarcity and the unequal distribution and preservation patterns of phosphate and carbonates, respectively, in the geological record and the biomineralization process that produces those minerals, we propose a hypothesis for the lack of Fe-phosphates in natural environments and ancient rocks.

No MeSH data available.


Related in: MedlinePlus

X-ray diffractogram of the bioprecipitates formed in T. Lapidicaptus anaerobic cultures. V, Vivianite; S, siderite.
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Figure 1: X-ray diffractogram of the bioprecipitates formed in T. Lapidicaptus anaerobic cultures. V, Vivianite; S, siderite.

Mentions: The mineral precipitates formed exclusively in culture bottles with active bacterial cells, while no mineral precipitation occurred in sterile parallel controls (bottles with non-viable cells and without cells). The pH changed from 6 to ~7.5 in cultures with living bacteria. No change in pH was detected in the control experiments. The starting concentration of Fe2+ was 0.56 g/L and the final concentration, after mineral precipitation, 0.01 g/L. The XRD study reveals that the bioprecipitates are composed of vivianite and siderite, being vivianite the dominant mineral phase (Figure 1).


Nucleation of Fe-rich phosphates and carbonates on microbial cells and exopolymeric substances.

Sánchez-Román M, Puente-Sánchez F, Parro V, Amils R - Front Microbiol (2015)

X-ray diffractogram of the bioprecipitates formed in T. Lapidicaptus anaerobic cultures. V, Vivianite; S, siderite.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4585095&req=5

Figure 1: X-ray diffractogram of the bioprecipitates formed in T. Lapidicaptus anaerobic cultures. V, Vivianite; S, siderite.
Mentions: The mineral precipitates formed exclusively in culture bottles with active bacterial cells, while no mineral precipitation occurred in sterile parallel controls (bottles with non-viable cells and without cells). The pH changed from 6 to ~7.5 in cultures with living bacteria. No change in pH was detected in the control experiments. The starting concentration of Fe2+ was 0.56 g/L and the final concentration, after mineral precipitation, 0.01 g/L. The XRD study reveals that the bioprecipitates are composed of vivianite and siderite, being vivianite the dominant mineral phase (Figure 1).

Bottom Line: Although phosphate and carbonate are important constituents in ancient and modern environments, it is not yet clear their biogeochemical relationships and their mechanisms of formation.Microbially mediated carbonate formation has been widely studied whereas little is known about the formation of phosphate minerals.Here we report that a new bacterial strain, Tessarococcus lapidicaptus, isolated from the subsurface of Rio Tinto basin (Huelva, SW Spain), is capable of precipitating Fe-rich phosphate and carbonate minerals.

View Article: PubMed Central - PubMed

Affiliation: Department of Planetology and Habitability, Centro de Astrobiología (INTA-CSIC) Madrid, Spain.

ABSTRACT
Although phosphate and carbonate are important constituents in ancient and modern environments, it is not yet clear their biogeochemical relationships and their mechanisms of formation. Microbially mediated carbonate formation has been widely studied whereas little is known about the formation of phosphate minerals. Here we report that a new bacterial strain, Tessarococcus lapidicaptus, isolated from the subsurface of Rio Tinto basin (Huelva, SW Spain), is capable of precipitating Fe-rich phosphate and carbonate minerals. We observed morphological differences between phosphate and carbonate, which may help us to recognize these minerals in terrestrial and extraterrestrial environments. Finally, considering the scarcity and the unequal distribution and preservation patterns of phosphate and carbonates, respectively, in the geological record and the biomineralization process that produces those minerals, we propose a hypothesis for the lack of Fe-phosphates in natural environments and ancient rocks.

No MeSH data available.


Related in: MedlinePlus