v) (Mantis et al., 2005). The decrease of luminescence of the bacteria
before and after being incubated (15 C, 30 min) with 9 dilutions
of soil extract (from 6.25% to 100% v/v) was assessed in
duplicate. The effective concentration (%v/v) with a toxic effect on
50% of the population of the marine microorganisms (EC50) was
calculated.