Figure 7.

Biofilm viability results created on PLA film in percentage of relative light units. The smooth bars are for non-degraded samples, the diagonally hatched bars are for the samples degraded for one month, and the notched bars are for the samples degraded for 3 months. Statistical difference (p < 0.05) is marked with the different letters depending on which sample it is compared with. The letters ^N is used to 0/0₀; ^O is used to 3/0₀; ^P is used to 0/0₁; ^Q is used to 0/1₁; ^R is used to 3/0₁; ^S is used to 3/1₁.