Article Abstract:
The facultative anaerobe Shewanella putrefaciens grows by reducing elemental sulfur to H2S. A study conducted on the strain MR-1 indicates that the removal of the end product, H2S, supports growth at 2 to 30 mM of sulfur concentrations. Six out of nine strains of S. putrefaciens grow by reducing sulfur. Cell-to-sulfur contact is, however, unnecessary for growth. Low concentrations of Casamino Acids enhance growth on sulfur and are used by the organism as the only carbon and energy source.
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Article Abstract:
The physiology and enzymology involved in denitrification by Shewanella putrefaciens was tested for coupling of the reduction of nitrate and/or nitrite. The study also examined the ability of S. putrefaciens to respire nitrate under aerobic growth conditions. Results reveal that anaerobic growth with nitrate led to rapid and complete reduction of nitrate to nitrite in all of the S. putrefaciens strains tested.
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Article Abstract:
The dissolved extracellular DNA has served as a single source of phosphorus, as well as carbon and energy, for metal-reducing bacteria of the genus Shewanella. The studies have shown that the ability to use exogenous DNA as the sole source of phosphorus is widespread among the shewanellae and is important for nutrient cycling in metal-reducing environments.
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