Figure 2: Colonies of the: 1. B. elkanii SEMIA 587, 2. 4080ΩZ03 (positive control); 3. 587::TnphoA-33; 4. 587::TnphoA-24; 5. 587::TnphoA-33; 6. 4080ΩZ03 (positive control), growtn in RDM medium with a fluorescent brightener 28 (calcofluor white; Sigma-Aldrich) after 24 and 72 hours at 30°C. The colonies was observed using illumination of white light (a) and the dishes with UV light of 430 nm wavelength (b).