Enzymatic recovery of elemental palladium by using sulfate-reducing bacteria

Article Abstract:

Resting cells of Desulfovibrio desulfuricans ATCC 29577 were employed to reduce soluble Pd2+ to elemental, cell-bound palladium supported by pyruvate, formate of H2 as the electron donor without biochemical cofactors. The employment of hydrogen as the electron donor suggests the possible use of hydrogenase with cytochrome c activity in Pd reduction, in accordance with the periplasmic localization of many hydrogenases in the sulfate-reducing bacteria and their inhibition in Cu2+.

Usage, Microbial enzymes, Palladium

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Evaluation of Leptospirillum ferroxidans for leaching

Article Abstract:

The sulfur and ferrous-iron oxidizing bacterial populations in mine and dump biotopes were investigated. Pure cultures of Lepstospirrillum ferroxidans, Thiobacillus ferooxidans and Thiobacillus thiooxidans were isolated and studies on morphological, physiological and genetic characterization were done. Studies of leaching capacities of the three species were also conducted.

Soils, Leaching, Soil leaching

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Presence of nitrate-accumulating sulfur bacteria and their influence on nitrogen cycling in a shallow coastal marine sediment

Article Abstract:

Nitrate-accumulating sulfur bacteria at the sediment-water interface of bays and estuaries may adversely affect the denitrification of the soil and increase eutrophication. This was the conclusion of a study of nitrate flux in the sediment-water interface of Tokyo Bay.

Environmental aspects, Nitrates, Estuarine ecology, Estuarine ecosystems

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