Nucleation of calcium carbonate on bacterial nanoglobules

Aloisi, Giovanni; Gloter, Alexandre; Krüger, Martin; Wallmann, Klaus; Guyot, F.; Zuddas, Paola

doi:10.1130/g22986a.1

Cited by 158 publications

(120 citation statements)

References 26 publications

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“…In two independent experiments where soils were exposed to CO 2 flux conditions Deltaproteobacteria, specifically the Desulfobacterales were enriched under high CO 2 [66,67]. Precipitation of calcium carbonate was shown on extracellular nanoglobules produced by Desulfonatronum lacustre in laboratory experiments [68] and sulfate-reducing bacteria cell surfaces have been shown to promote carbonate precipitation as well. [69].…”

Section: Changes In Microbial Diversity In Response To Elevated Comentioning

confidence: 99%

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

et al. 2014

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Atmospheric levels of carbon dioxide (CO 2 ) are rising at an accelerated rate resulting in changes in the pH and carbonate chemistry of the world's oceans. However, there is uncertainty regarding the impact these changing environmental conditions have on carbonate-depositing microbial communities. Here, we examine the effects of elevated CO 2 , three times that of current atmospheric levels, on the microbial diversity associated with lithifying microbial mats. Lithifying microbial mats are complex ecosystems that facilitate the trapping and binding of sediments, and/or the precipitation of calcium carbonate into organosedimentary structures known as microbialites. To examine the impact of rising CO 2 and resulting shifts in pH on lithifying microbial mats, we constructed growth chambers that could continually manipulate and monitor the mat environment. The microbial diversity of the various treatments was compared using 16S rRNA gene pyrosequencing. The results indicated that elevated CO 2 levels during the six month exposure did not profoundly alter the microbial diversity, community structure, or carbonate precipitation in the microbial mats; however some key taxa, such as the sulfate-reducing bacteria Deltasulfobacterales, were enriched. These results suggest that some carbonate depositing ecosystems, such as the microbialites, may be more resilient to anthropogenic-induced environmental change than previously thought. OPEN ACCESSMinerals 2014, 4 146

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Section: Changes In Microbial Diversity In Response To Elevated Comentioning

confidence: 99%

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

et al. 2014

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“…Biologically induced mineralization of calcium carbonate can take place passively (metabolically driven changes in the chemistry around the living organisms) or actively (when the organism or its metabolic byproducts provide nucleation sites which allow the carbonate molecules to become particularly aligned in order to promote mineralization) (Northup & Lavoie, 2001;Jones, 2010). The bacterial surface (S-layers, specific proteins) has been suggested as possible nucleation sites that are probably just a side effect of their shape (Van Lith et al, 2003;Dupraz et al, 2004;Aloisi et al, 2006). These peculiarities can explain why some strains in a species are able to promote crystal formation and others not.…”

Section: Microbial Communities In a Mallorcan Coastal Cavementioning

confidence: 99%

Microbial communities in a coastal cave: Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Busquets¹,

Fornós²,

Zafra³

et al. 2014

IJS

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“…The principal mechanisms involved in stromatolite formation are (i) heterogeneous crystal nucleation at acidic extracellular polymeric substances (1,19,22,32) and (ii) increases in the Ca 2ϩ ϫ CO 3 2Ϫ ion activity product (IAP), which may be induced by microbial activity (e.g., photosynthesis, sulfate reduction) and/or external physicochemical factors (e.g., evaporation, CO 2 degassing) (5,21,25,31). Lamination of microbialite deposits may result from a number of factors, including seasonally induced changes to calcification processes caused by changes in biofilm composition and calcium carbonate mineral supersaturation.…”

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confidence: 99%

Metabolic Microenvironmental Control by Photosynthetic Biofilms under Changing Macroenvironmental Temperature and pH Conditions

Bissett

Reimer

Beer

et al. 2008

Appl Environ Microbiol

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Ex situ microelectrode experiments, using cyanobacterial biofilms from karst water creeks, were conducted under various pH, temperature, and constant-alkalinity conditions to investigate the effects of changing environmental parameters on cyanobacterial photosynthesis-induced calcification. Microenvironmental chemical conditions around calcifying sites were controlled by metabolic activity over a wide range of photosynthesis and respiration rates, with little influence from overlying water conditions. Regardless of overlying water pH levels (from 7.8 to 8.9), pH at the biofilm surface was approximately 9.4 in the light and 7.8 in the dark. The same trend was observed at various temperatures (4°C and 17°C). Biological processes control the calcium carbonate saturation state (⍀) in these and similar systems and are able to maintain ⍀ at approximately constant levels over relatively wide environmental fluctuations. Temperature did, however, have an effect on calcification rate. Calcium flux in this system is limited by its diffusion coefficient, resulting in a higher calcium flux (calcification and dissolution) at higher temperatures, despite the constant, biologically mediated pH. The ability of biological systems to mitigate the effects of environmental perturbation is an important factor that must be considered when attempting to predict the effects of increased atmospheric partial CO 2 pressure on processes such as calcification and in interpreting microfossils in the fossil record.

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Nucleation of calcium carbonate on bacterial nanoglobules

Cited by 158 publications

References 26 publications

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Microbial communities in a coastal cave: Cova des Pas de Vallgornera (Mallorca, Western Mediterranean)

Metabolic Microenvironmental Control by Photosynthetic Biofilms under Changing Macroenvironmental Temperature and pH Conditions

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