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Minerals 2016, 6(4), 122;

Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions

Department of Geological Engineering, Istanbul Technical University (ITU), Ayazaga Campus, 34469 Maslak, Istanbul, Turkey
Author to whom correspondence should be addressed.
Academic Editor: Juan Diego Rodriguez-Blanco
Received: 4 September 2016 / Revised: 23 October 2016 / Accepted: 2 November 2016 / Published: 11 November 2016
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The present study demonstrated formation of Ca and P rich nanoglobules by a mixed natural halophilic population enriched from hypersaline lake sediments in laboratory culture experiments. Nanoglobules consisting of complex mixture of Ca, P, O, and C with minor amount of Mg occurred in the external envelop of bacterial cell in the first week of incubation at various Mg+2/Ca+2 ratios and salinity at 30 °C. Unlike the control experiments (e.g., non-viable cells and without cells), later aggregation and transformation of nanoglobules caused the precipitation of calcium and/or magnesium carbonates in variable amount depending on the Mg+2/Ca+2 ratios of the medium after 37 days of incubation. By showing the nucleation of carbonates on bacterial nanoglobules closely associated with the cell surfaces of mixed natural population this study emphasis that formation of nanoglobules may not be specific to a microbial strain or to activity of a particular microbial group. Formation of carbonate nanoglobules under various conditions (e.g., Mg+2/Ca+2 ratios, salinity) with the same halophilic culture suggest that the although metabolic activity of bacteria have an influence on formation of nanoglobules the mineralogy of nanoglobules may be controlled by the physicochemical conditions of the precipitation solution and the rate of mineral precipitation. View Full-Text
Keywords: nanoglobules; halophilic bacteria; Lake Acıgöl; carbonates nanoglobules; halophilic bacteria; Lake Acıgöl; carbonates

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Balci, N.; Demirel, C. Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions. Minerals 2016, 6, 122.

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