Enzyme activity of malate dehydrogenase (MDH), aconitase (ACN), fumarase (FUM), and succinate dehydrogenase (SDH) after µAPPJ treatment for 1 min. E. coli wild type cells were left untreated (gray, set to 1.0), exposed to gas flow (blue), or treated with plasma (orange). Residual enzyme activity was determined either directly after treatment (t0, dark bars) or after a 20 min post-plasma incubation at 37°C (t20, light bars). Averages and standard deviations represent three independent biological replicates.