The study of Nickel Resistant Bacteria (NiRB) isolated from wastewaters polluted with different industrial sources

Background: pollution due to the heavy metals is a problem that may have negative consequences on thehydrosphere. one of the best procedures in removing the toxic metals from the environment is using metalresistant bacteria.results: in the present study eight nickel resistant bacteria were isolated from industrial wastewaters. three ofthem 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 andthey were identified as cupriavidus sp atha3, klebsiella oxytoca atha6 and methylobacterium sp atha7. the accessionnumbers assigned to atha3, atha6 and atha7 strains are jx120152, jx196648 and jx457333 respectively. the growthrate 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 nipolluted waste water and sewage.