ADS activity (as µmol of ammonia) was measured by quantification of ammonia generated from the incubation of biofilm with Nessler’s reagent at 37 °C as per a previous study44 (link). The ammonia produced was detected by Nessler’s reagent (Sigma-Aldrich, St. Louis, USA) using 8-point reference of ammonium sulfate (10 mM high-point reference) subjected to a standard curve (R2 = 0.999). Each sample was assayed in triplicate. ADS activity determined was recorded as µmol of ammonia liberated in the biofilm.
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