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Brdicka has shown that proteins give rise to characteristic polarographic double waves in the presence of C02+ ions (Brezina & Zuman, 1958). These waves have been attributed to a catalytic reaction occurring at the dropping-mercury electrode, although the theoretical aspects of the reaction are still not well understood (Muller, 1963). Attempts have been made to utilize this reaction as a diagnostic test for cancer (Stricks, Kolthoff, Bush & Juroda, 1953). Conventional polarography has been used to

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