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ABSTRACT
Twenty seven arsenic-transforming bacterial strains were isolated from three different arsenic polluted areas in Bulgaria. The bacterial strains were taxonomical identified and characterized. It was determined that they belong to the genera: Pseudomonas, Alcaligenes, Azoarcus and Thauera. Using PCR-RFLP of 16S DNA and of ITS fragment, it was determined that the investigated bacteria are different strains of the species: Ps. pseudoalcaligenes, Ps. mendocina and identity strains of the species: Ps. stutzeri, Ps. putida, Ps. aeruginosa and Ps. fulva.