Fig 4.
Concentrations of SDZ and 2-AP in M. lacus strain SDZm4 culture supernatants incubated in SDZ-amended Mueller-Hinton broth (1/10 strength plus 40 μmol l−1 SDZ). The SDZ concentration at time zero is reduced due to dilution with a SDZ-free but 2-AP-containing bacterial inoculum (10% of the culture volume); for the same reason, 2-AP was already detectable at time zero. 2-AP and SDZ concentrations were fitted with equation 1 and equation 2, respectively. tts (see equation 3) were 53.5 h for 2-AP and 52.3 h for SDZ.