Cd, Cu, Ni, Mn and Zn resistance and bioaccumulation by thermophilic bacteria, Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis.
Bioaccumulation and heavy metal resistance of Cd(2+), Cu(2+), Ni(2+), Zn(2+) and Mn(2+) 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.
Biology Department, Faculty of Science, Dicle University, 21280, Diyarbakir, Turkey.
Sadin
S
Ozdemir
Ersin
E
Kilinc
Annarita
A
Poli
Barbara
B
Nicolaus
Kemal
K
Güven
D001673:Biodegradation, Environmental; D002104:Cadmium / Q000493:pharmacokinetics / Q000633:toxicity; D003300:Copper / Q000493:pharmacokinetics / Q000633:toxicity; D024881:Drug Resistance, Bacterial; D004785:Environmental Pollutants / Q000493:pharmacokinetics / Q000633:toxicity; D056506:Geobacillus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D008345:Manganese / Q000493:pharmacokinetics / Q000633:toxicity; D019216:Metals, Heavy / Q000493:pharmacokinetics* / Q000633:toxicity*; D008826:Microbial Sensitivity Tests; D009532:Nickel / Q000493:pharmacokinetics / Q000633:toxicity; D013045:Species Specificity; D015032:Zinc / Q000493:pharmacokinetics / Q000633:toxicity
D004785:Environmental Pollutants; D019216:Metals, Heavy; D002104:Cadmium; D008345:Manganese; D003300:Copper; D009532:Nickel; D015032:Zinc