Abstract

The results of irradiation studies of human ceruloplasmin, mushroom tyrosinase and Limulus polyphemus hemocyanin with a nitrogen laser (Λ = 337.1 nm) are presented. In all the proteins we have considered the absorption band at 330 nm, characteristic of dimer Type 3 copper centres, decreases, while an increase of the absorbance at 280 nm is observed. Moreover a new band at about 400 nm appears in irradiated ceruloplasmin. Finally sharp oscillations of the absorbance at 610 and 794 nm are recorded in ceruloplasmin, when the irradiation is switched off.

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