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By Marcel Florkin, Elmer H. Stotz

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The exceptionally strong electron-accepting properties of alloxan have been entirely confirmed by similar polarographic studies on the system alloxanalloxantin-dialuric acid 120 and through the formation of an alloxan anionic free radical by electron acceptance through charge-transfer interaction with a number of electron donors 121,122 . On the other hand, in so far as the electron-donor properties of the purines and pyrimidines are concerned, these are deducible from the results of oxidation (anodic) waves at the stationary graphite electrode.

100 and 101). It is still more gratifying to observe that the transformation G-C-* A-T seems actually to be a characteristic of spontaneous mutations". (c) Van der Waals-London interactions As already mentioned, hydrogen bonds between the base pairs are no longer considered as the major source of the stability of the double-stranded structure of the nucleic acids although they obviously play the essential role of References p. 56 24 QUANTUM BIOCHEMISTRY I determining the base-pairing specificity.

92 for the four reducible molecules and exceed — 1 for the three non-reducible ones. Similarly in the series of the pyrimidines, while cytosine is very easily reducible, uracil and thymine have shown stability to polarographic reduction 118 ' 119 . The exceptionally strong electron-accepting properties of alloxan have been entirely confirmed by similar polarographic studies on the system alloxanalloxantin-dialuric acid 120 and through the formation of an alloxan anionic free radical by electron acceptance through charge-transfer interaction with a number of electron donors 121,122 .

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