Abstract
1. 1. The circular dichroism spectra of hemocyanins from different sources, namely Octopus vulgaris (Mollusca), Carcinus maenas and Limulus polyphemus (Arthropoda) have been carried out under different experimental conditions. 2. 2. A substantial similarity between molluscan and arthropod hemocyanins is shown by a Gaussian analysis of the spectra in the visible region. A tentative assignment of the d-d electronic transitions involved is reported. 3. 3. The involvement of tyrosyl residues in the reversible oxygenation-deoxygenation process is suggested by the spectra of native (oxy- and deoxygenated) and copper free hemocyanin in 3M urea, as compared to those monitored in buffered solutions.
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