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Fate of Selenate and Selenite Metabolized by Rhodobacter sphaeroides
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ABSTRACT
Cultures of a purple nonsulfur bacterium,
Rhodobacter sphaeroides
, amended with ∼1 or ∼100 ppm selenate or selenite, were grown phototrophically to stationary phase. Analyses of culture headspace, separated cells, and filtered culture supernatant were carried out using gas chromatography, X-ray absorption spectroscopy, and inductively coupled plasma spectroscopy-mass spectrometry, respectively. While selenium-amended cultures showed much higher amounts of SeO
3
2−
bioconversion than did analogous selenate experiments (94% uptake for SeO
3
2−
as compared to 9.6% for SeO
4
2−
-amended cultures from 100-ppm solutions), the chemical forms of selenium in the microbial cells were not very different except at exposure to high concentrations of selenite. Volatilization accounted for only a very small portion of the accumulated selenium; most was present in organic forms and the red elemental form.
American Society for Microbiology
Title: Fate of Selenate and Selenite Metabolized by
Rhodobacter sphaeroides
Description:
ABSTRACT
Cultures of a purple nonsulfur bacterium,
Rhodobacter sphaeroides
, amended with ∼1 or ∼100 ppm selenate or selenite, were grown phototrophically to stationary phase.
Analyses of culture headspace, separated cells, and filtered culture supernatant were carried out using gas chromatography, X-ray absorption spectroscopy, and inductively coupled plasma spectroscopy-mass spectrometry, respectively.
While selenium-amended cultures showed much higher amounts of SeO
3
2−
bioconversion than did analogous selenate experiments (94% uptake for SeO
3
2−
as compared to 9.
6% for SeO
4
2−
-amended cultures from 100-ppm solutions), the chemical forms of selenium in the microbial cells were not very different except at exposure to high concentrations of selenite.
Volatilization accounted for only a very small portion of the accumulated selenium; most was present in organic forms and the red elemental form.
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