Origem da vida? Simples auto-organização mineral biomimética de nascente de águas ricas em sílica. Será?

terça-feira, março 21, 2017

Biomimetic mineral self-organization from silica-rich spring waters

Juan Manuel García-Ruiz1,*, Elias Nakouzi2, Electra Kotopoulou1, Leonardo Tamborrino1,† and Oliver Steinbock2

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Science Advances 17 Mar 2017:

Vol. 3, no. 3, e1602285

Fig. 3 Silica gardens


Purely inorganic reactions of silica, metal carbonates, and metal hydroxides can produce self-organized complex structures that mimic the texture of biominerals, the morphology of primitive organisms, and that catalyze prebiotic reactions. To date, these fascinating structures have only been synthesized using model solutions. We report that mineral self-assembly can be also obtained from natural alkaline silica-rich water deriving from serpentinization. Specifically, we demonstrate three main types of mineral self-assembly: (i) nanocrystalline biomorphs of barium carbonate and silica, (ii) mesocrystals and crystal aggregates of calcium carbonate with complex biomimetic textures, and (iii) osmosis-driven metal silicate hydrate membranes that form compartmentalized, hollow structures. Our results suggest that silica-induced mineral self-assembly could have been a common phenomenon in alkaline environments of early Earth and Earth-like planets.

Keywords Silica Biomorphs Chemical Gardens self-organization Calcite witherite nano composites Life detection Prebiotic chemistry Aqua de Ney

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