Significant genes identified by microarray transcriptomic analysis in the biofilm bacteria exposed to 170/mL ampicillin.

Genes that were either up or down regulated (≥1.5-fold plus P≤0.05, T-test and FDR≤0.05) when biofilms were formed in the presence of 170 ng/mL ampicillin are listed. Eight genes were up-regulated and 51 were down-regulated. Of the eight up-regulated genes, 5 were involved in carbohydrate metabolism and were enzymes involved in glycogen processing. The down-regulated genes were involved in a wide range of metabolic processes and 18 genes were unannotated (hypothetical).