To assess the metal resistance of the produced biofilms, Pb2+, Zn2+, Cd2+, Cu2+, and Ni2+ salts were generated from Pb(NO3)2, ZnSO4, CdSO4, CuSO4, and NiSO4 salts (Sigma-Aldrich, St. Louis, MO, USA). No more than 60 min before usage, working solutions were produced in TSB medium from stock solutions. Based on the previous research (Basak et al., 2014 (link)) and the preliminary test, a concentration range of 100,000–781 μg/ml was chosen (Buzejić et al., 2016 (link)).
Free full text: Click here