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The relative importance of each of the tested independent variables on the bioremoval of cobalt by P. alcaliphila. X1, pH; X2, incubation time (h); X3, initial CoSO4.7H2O (ppm); X4, glucose (%); X5, glycerol (%); X6, peptone (%); X7, K2HPO4 (%); X8, MgSO4.7H2O (%).
