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Related Experiment Videos

Mobilization of selenium by a selenium-dependent bacterium.

A A Razak1, S E Ramadan, K el-Zawahry

  • 1Department of Botany, Faculty of Science, Al-Azhar University, Medinet Nasr, Cairo, Egypt.

Biological Trace Element Research
|June 1, 1990
PubMed
Summary

This study shows Bacillus sp. can grow in high sodium selenite conditions, accumulating significant selenium. The bacterium transforms inorganic selenium into volatile forms, influenced by environmental factors.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biochemistry

Background:

  • Selenium is an essential trace element for many organisms.
  • Some bacteria can metabolize selenium compounds.
  • Understanding microbial selenium transformation is crucial for bioremediation and biogeochemical cycling.

Purpose of the Study:

  • To investigate the growth and selenium accumulation of a selenium-dependent Bacillus sp.
  • To determine the conditions for optimal volatile selenium production by this bacterium.

Main Methods:

  • Culturing Bacillus sp. on media with varying sodium selenite concentrations.
  • Measuring selenium accumulation within the bacterial cells.
  • Analyzing the release of volatile selenium compounds under different environmental conditions (temperature, pH, incubation time, substrate concentration).

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Main Results:

  • Bacillus sp. demonstrated growth in selenium-free media but thrived at high sodium selenite concentrations (up to 3%).
  • The bacterium accumulated substantial selenium (432 ppm/mL).
  • Optimal volatile selenium release occurred at 30°C, pH 7, and 1% sodium selenite.

Conclusions:

  • Bacillus sp. exhibits remarkable tolerance and accumulation of selenium.
  • The bacterium actively transforms inorganic selenium into volatile forms.
  • Environmental factors significantly influence the biological release of volatile selenium, suggesting potential for bioremediation applications.