Cd, Cu, Ni, Mn and Zn resistance and bioaccumulation by thermophilic bacteria, Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis |
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| Authors: | Sadin ?zdemir Ersin Kilinc Annarita Poli Barbara Nicolaus Kemal Güven |
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| Institution: | (1) Biology Department, Faculty of Science, Dicle University, 21280 Diyarbakir, Turkey;(2) Chemistry Department, Faculty of Science, Dicle University, 21280 Diyarbakir, Turkey;(3) National Research Council of Italy (C.N.R.), Institute of Biomolecular Chemistry, via Campi Flegrei, n. 34, 80078 Pozzuoli, Napoli, Italy; |
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| Abstract: | Bioaccumulation and heavy metal resistance of Cd2+, Cu2+, Ni2+, Zn2+ and Mn2+ ions by thermophilic Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis were investigated. The metal resistance from the most resistant to the most sensitive was found as Mn > Ni > Cu > Zn > Cd
for both Geobacillus thermoleovorans subsp. stromboliensis and Geobacillus toebii subsp. decanicus. It was determined that the highest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Zn (36,496 μg/g dry weight cell), and the lowest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Ni (660.3 μg/g dry weight cell). Moreover, the dead cells were found to biosorbe more metal in their membranes compared
to the live cells. In the presence of 7.32 mg/l Cd concentration, the levels of Cd absorbed in live and dead cell membranes
were found as 17.44 and 46.2 mg/g membrane, respectively. |
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