Figure 5
Spectra from X-irradiated crystals of apoferritin, N9 neuraminidase, HEWL and bovine trypsin. All but apoferritin show a peak around 400 nm corresponding to the disulfide radical anion. The broad absorption of the apoferritin from 500 nm into the UV region is probably due to the presence of residual iron in the protein crystal. The dose per 1 s of beam irradiation was estimated to be 4 × 104 Gy, giving a total of 1.2 × 106 Gy for the 30 s of exposure to which these crystals were subjected. |