Bacterial strains isolated D1.1 D1.3 D1.4 D1.6
MnP enzyme activity (U/liter) 2.9690 5.9791 7.4738 5.2317
aAn unit of enzyme activity of MnP is required for oxidation 1 μM of phenol red forming a product absorption wavelength λ = 610 nm in 1 min at the experimental conditions.
Table 2: MnP enzyme activity (U/liter) a of four microorganism after 120 hours of culture on mineral salts liquid medium.