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Mobilization of selenium by a selenium-dependent bacterium

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Abstract

A selenium-dependent bacterium,Bacillus sp., failed to grow on selenium-free media. However, it is able to grow at high concentrations of sodium selenite containing media up to 3% (w/v). It accumulated extraordinary high quantities of selenium, 432 ppm/mL. The bacterium generated the transformation of inorganic selenium into volatile selenium form(s) into the atmosphere. The biological release of volatile selenium basically depended on several factors: incubation temperature, pH, incubation periods, and substrate concentration. Maximal quantity of the volatile selenium form was obtained at 30°C, pH 7, and 1% (w/v) sodium selenite.

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Correspondence to A. A. Razak.

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Razak, A.A., Ramadan, S.E. & Zawahry, K.E.L. Mobilization of selenium by a selenium-dependent bacterium. Biol Trace Elem Res 25, 193–199 (1990). https://doi.org/10.1007/BF02990414

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Index Entries

  • Selenium
  • selenium mobilization
  • selenium-dependent bacterium
  • Bacillus sp.
  • sodium selenite
  • environmental pollution