Biological UV dosimetry using the DLR-biofilm

Area of Science:

• Environmental Science
• Biophysics
• Microbiology

Background:

• Global atmospheric changes are altering environmental UV radiation levels, significantly impacting the biosphere.
• Accurate UV monitoring is crucial for understanding and mitigating the biological effects of these changes.
• Biological UV dosimeters can complement physical measurements by directly weighting UV radiation based on biological responses.

Purpose of the Study:

• To introduce and demonstrate the applicability of biological UV dosimeters for accurate UV monitoring.
• To highlight the DLR-biofilm, a biological UV dosimeter utilizing immobilized Bacillus subtilis spores.
• To show how biological dosimeters can weight UV spectral irradiance according to biological effectiveness.

Main Methods:

• Utilizing immobilized spores of the bacterium Bacillus subtilis (DLR-biofilm) as a biological UV sensor.
• Employing UV-dependent endpoints in biomolecules, microorganisms, and cells as sensing elements.
• Demonstrating the DLR-biofilm's ability to weight incident UV radiation by its DNA-damaging effectiveness.

Main Results:

• The DLR-biofilm effectively weights incident UV radiation according to its DNA-damaging potential.
• The study demonstrated the applicability of the DLR-biofilm technique for personal UV dosimetry.
• The DLR-biofilm was shown to be effective in measuring biologically weighted irradiance from both the sun and artificial UV sources.

Conclusions:

• Biological UV dosimeters, such as the DLR-biofilm, provide a direct and effective method for measuring biologically relevant UV radiation.
• The DLR-biofilm offers a reliable tool for personal UV dosimetry and environmental monitoring.
• This approach complements traditional physical UV measurements by incorporating biological weighting factors.