Simultaneous reduction of nitrate and selenate by cell suspensions of selenium-respiring bacteria

Article Abstract:

Nitrate and selenate and their simultaneous reduction by cell suspensions of selenium-respiring bacteria are discussed. Washed-cell suspensions of Sulfurospirillu barnesii-reduced selenate were used. Electron acceptors were thiosulfate, nitrate, fumarate or arsenate. The organisms can decrease ambient Se(VI) concentrations to levels in compliance with new regulations proposed for selenium oxyanion release and may be useful with agricultural wastewater rich in nitrates and with selenate.

Statistical Data Included, Agriculture, Usage, Environmental aspects, Bacteria, Electron donor-acceptor complexes

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Nitrate is a preferred electron acceptor for growth of freshwater selenate-respiring bacteria

Article Abstract:

A freshwater culture of selenate-respiring bacteria was grown using nitrate or selenate as an electron acceptor. Results showed that the isolate from the culture grew on either nitrate or selenate. However, in combination the reduction of nitrate precluded that of selenate. In addition, cultures of denitrifying bacteria showed anaerobic growth on nitrate but not on selenate.

Research, Bioremediation, Microbial respiration

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Structural and spectral features of selenium nanospheres produced by se-respiring bacteria

Article Abstract:

Research shows that three selenate- and selenite-respiring bacteria form extracellular granules of stable, uniform nanospheres of selenium when grown with selenium oxyanions as the electron acceptor. The selenium nanospheres exhibit monoclinic crystalline structures and their spectral properties differed from those of amorphous selenium oxyanions.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Selenium, Analysis, Physiological aspects, Microbial metabolism, Microbiological synthesis, Spectra, Optical properties, Structure

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