View the MathML source is an oxygen-centered radical and plays an important role in the formation of other reactive oxygen species (ROS) such as hydrogen peroxide, hydroxyl radical, and singlet oxygen by a chain reaction (Ulanski and Sonntag, 1999), which induce oxidative damage in lipids, proteins and DNA. To evaluate whether T. dealbata aqueous extract interferes with the View the MathML source generation, we conducted the View the MathML source assay and found an obvious increase in the M. aeruginosa cells after T. dealbata roots aqueous extract exposure.