Figure 9: Effect of microwave power (M/Mo) on amplitudes (A) (a) and linewidths (ΔBpp) (b) of EPR spectra of streptomycin sterilized at 160°C (120 minutes), 170°C (60 minutes), and 180°C (30 minutes). The data for the EPR spectra measured with microwave power of 2.2 mW at room temperature 20 minutes, 7 days, and 30 days after sterilization.