Experimental maturation of Archaea encrusted by Fe-phosphates

Sphaerotilus natans encrusted with nanoball-shaped Fe(III) oxide minerals formed by nitrate-reducing mixotrophic Fe(II) oxidation

Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575(T) under mixotrophic condition. Sphaerotilus ...

Reductive precipitation of gold by dissimilatory Fe(III)-reducing bacteria and archaea.

Studies with a diversity of hyperthermophilic and mesophilic dissimilatory Fe(III)-reducing Bacteria and Archaea demonstrated that some of these organisms are capable of precipitating gold by reducing Au(III) to Au(0) with hydrogen as the electron donor. These studies suggest that models for the formation of gold deposits in both hydrothermal and cooler environments should consider the possibil...

Reductive Presipitation of Gold by Dissimilatory Fe(III)-Reducing Bacteria and Archaea

Limited reduction of ferrihydrite encrusted by goethite in freshwater sediment.

Many physical and chemical processes control the extent of Fe(III) oxyhydroxide reduction by dissimilatory Fe(III)-reducing bacteria. The surface precipitation of secondary Fe minerals on Fe(III) oxyhydroxides limits the extent of microbial Fe(III) reduction, but this phenomenon has not yet been observed in nature. This paper reports the observation of secondary Fe-mineral (goethite) encrustati...

Encrusted Uretero-pyelitis: Case Report

Encrusted uretero-pyelitis is a rare and serious disease, related to the presence of calcifications in the pelvicalyceal system and ureter, associated with chronic urinary tract infection. In most cases, the causal agent of this infection lithiasis is corynebacterium urealyticum. The specific aspect of calcifications on CT scan can help to suggest diagnosis. To avoid a delay in diagnosis (which...