Author/Authors :
Alboghobeish، Hoda نويسنده Microbiology Department, Falavarjan Branch, Islamic Azad University, Falavarjan, Isfahan, Iran , , Tahmourespour، Arezoo نويسنده Basic Medical Sciences Department, Khorasgan (Isfahan) Branch, Islamic Azad University, Isfahan, Iran , , Doudi، Monir نويسنده Department of Microbiology, Falavarjan Branch, Islamic Azad University, Isfahan, Iran Doudi, Monir
Abstract :
Background: Pollution due to the heavy metals is a problem that may have negative consequences on the
hydrosphere. One of the best procedures in removing the toxic metals from the environment is using metal
resistant bacteria.
Results: In the present study eight nickel resistant bacteria were isolated from industrial wastewaters. Three of
them were selected as the most resistant based on their Maximum tolerable concentration (8, 16 and 24 mM Ni2+).
Their identification was done according to morphological, biochemical characteristics and 16SrDNA gene sequencing and
they were identified as Cupriavidus sp ATHA3, Klebsiella oxytoca ATHA6 and Methylobacterium sp ATHA7. The accession
numbers assigned to ATHA3, ATHA6 and ATHA7 strains are JX120152, JX196648 and JX457333 respectively. The Growth
rate of the most resistant isolate, Klebsiella oxytoca strain ATHA6, in the presence of Ni2+ and the reduction in Ni2+
concentration was revealed that K oxytoca ATHA6 could decrease 83 mg/mL of nickel from the medium after 3 days.
Conclusion: It can be concluded that the identified Ni resistant bacteria could be valuable for the bioremediation of Ni
polluted waste water and sewage.
