Tellurite removal by a tellurium-tolerant halophilic bacterial strain, Thermoactinomyces sp. QS-2006

Autor: Mohammad Ali Amoozegar, Antonio Ventosa, Maryam Didari, Susan A. Baldwin, Maryam Khoshnoodi, Javad Hamedi
Rok vydání: 2011
Předmět:
Zdroj: Annals of Microbiology. 62:1031-1037
ISSN: 1869-2044
1590-4261
DOI: 10.1007/s13213-011-0343-1
Popis: Among the 25 strains of moderately halophilic bacteria isolated from the hypersaline environments of Iran, a Gram-positive and moderately halophilic bacterial strain isolated from a saline soil was identified as Thermoactinomyces sp. strain QS-2006. This strain was found to tolerate high concentrations of tellurite with growth occurring up to a concentration of 500 mM Te. When the strain was cultured aerobically in medium containing 0.1–3.0 mM potassium tellurite, tellurium was removed from the soluble toxic oxyanion form under a wide range of conditions including pH (7–10), temperature (30–45°C), agitation (0–220 rpm), and various concentrations of salts including NaCl , KCl , NaNO3 and NaCH3COOH (0.5–1.5 M). Maximum tellurite removal (95.5%) occurred in a medium containing 1–3% NaCl with a pH of 7.5 incubated at 35°C. Transmission Electron Microscope (TEM) coupled with Energy Dispersive X-ray (EDX) showed that tellurium compounds were adsorbed to the bacterium wall and inside the cytoplasm.
Databáze: OpenAIRE
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