Ninety-six well round-bottomed microwell plates (Corning Incor-
porated Life Sciences, Lowell MA, USA) were used. mMRS broth was
tested at 1/8×,1/4×,1/2×,1×, and 2× strength. Eachwellwas inoculated
with 50 μl of bacteria diluted to a concentration of 4000–6000 colony
forming units (CFU)/ml (chosen so that no visible pellet was produced
in the wells due to the inoculate itself).