![]() The synthesis has been performed by biomineralization of the bacterial wall of a sulfate-reducing Desulfovibrio sp. It is also possible that their capacity for metal immobilization can be used to counteract the disastrous effects of acid mine leachates.Ī composite based on nanorod-shaped greigite (Fe 3S 4) crystallites with adsorbed ferrihydrite (Fe 2O 3 ‧ nH 2O) nanoparticles has been synthesized. Since bacteria are ubiquitous in the natural environment, they can potentially play a significant role in the development of fine-grain minerals in soils and sediments. ![]() amorphous or crystalline phases depending on the stage of mineral development. Diverse mineral types, including hydroxides /oxides, carbonates, sulfates/ sulfides, and phosphates are common and can be in. It is not unusual for bacteria to precipitate an amount of metal equal to, or exceeding, their cellular weight. Once metal ions have interacted with the electronegative sites on these molecules, they nucleate the formation of fine-grained minerals using anions from the external milieu as counter-ions for additional metal complexation. This is mainly due to the overall anionic charge of bacterial surfaces imparted by the macromolecules which make up their fabric. ![]() As a result, by providing interfaces for sorption of metal cations, bacteria are efficient scavengers of dilute metals and can concentrate them from the surrounding aqueous environment. Bacteria are very small (∼ 1.5 μm 3), but have the largest surface area to volume ratio of any life form. ![]()
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