| The 10 ml samples were centrifuged and the absorbance of the supernatant was measured at 280 nm to determine the lignin content. |
| The absorbance was always kept below 0.05 to avoid self-absorption of the fluorescence. |
| The term extinction coefficients describes the absorbance spectra of a single pure substance at known concentrations. |
| The absorbance was measured with a microtiter plate reader at a test wavelength of 405 nm. |
| Under visible light irradiation, much longer durations were necessary to achieve similar absorbance decreases. |
| The total cavity loss is then the sum of the mirror transmission and the sample absorbance. |
