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Backscattering spectra over time in absence and presence of ceftiofur antibiotic at concentrations equal to 0, 10, 20, 30, 40, 50, 75 and 100 µg/kg. The fermentation was performed at the incubation temperature of 44 °C with 4.5% (w/w) starter concentration. Results are mean values of triplicates.
