Fig. 7
From: Short-term airborne ultrasound induced cell death in tobacco cells and changed their wall components

Effect of airborne US on phenolics metabolism of tobacco cells before and after treatment with 24 kHz airborne US. (A-D) A significant increase in phenolic acids was detected after exposure to both continuous and pulsatile airborne US modes. Different letters indicate significant differences according to the Duncan test (n = 3, p ≤ 0.05).