Growth of bacterial isolates on lignin. Growth of P. norimbergensis LD001, Pseudomonas sp. LD002 and Bacillus sp. LD003 on a) HMW lignin fraction and b) LMW lignin fraction. Experiments were performed in 4-fold; mean values of CFUs are shown with error bars indicating the maximum deviation from the mean. * Last CFU count for Bacillus sp. LD003 was performed at 96 h instead of 120 h.