Characterisation of CaCO<sub>3</sub> phases during strain-specific ureolytic precipitation.
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Clarà Saracho, A., Haigh, S., Hata, T., Soga, K., Farsang, S., Redfern, S., & Marek, E. (2020). Characterisation of CaCO<sub>3</sub> phases during strain-specific ureolytic precipitation.. Scientific reports, 10 (1), 10168. https://doi.org/10.1038/s41598-020-66831-y
Numerous microbial species can selectively precipitate mineral carbonates with enhanced mechanical properties, however, understanding exactly how they achieve this control represents a major challenge in the field of biomineralisation. We have studied microbial induced calcium carbonate (CaCO3) precipitation (MICP) in three ureolytic bacterial strains from the Sporosarcina family, including S. newyorkensis, a newly isolated microbe from the deep sea. We find that the interplay between structural water and strain-specific amino acid groups is fundamental to the stabilisation of vaterite and that, under the same conditions, different isolates yield distinctly different polymorphs. The latter is found to be associated with different urease activities and, consequently, precipitation kinetics. Besides being strain-specific, CaCO3 polymorphism also depends on the coupled effect of chemical treatment and initial bacterial concentrations. Only under specific conditions is metastable polymorph stabilisation attained. Our findings provide new insights into strain-specific CaCO3 polymorphic selection, and open up promising avenues for designing bio-reinforced geo-materials hat capitalise on the different particle bond mechanical properties offered by different polymorphs.
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External DOI: https://doi.org/10.1038/s41598-020-66831-y
This record's URL: https://www.repository.cam.ac.uk/handle/1810/305711
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