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By Jules Duchesne

Intra-and Intermolecular Interactions, Radiation results in DNA Cells, and service Mechanisms.

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Extra resources for Intra- and Intermolecular Interactions, Radiation Effects in DNA Cells, and Repair Mechanisms

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This implies that the proton on the N3 is involved in the hydrogen-bonding. However, the exact base-pairing is not yet established. the aggregation Folding other hand, ofwas poly inobserved Usalt-free also occurs (Brown, aqueous in other 1966; methanolic monovalent Millar solvent, and salts, MacKenzie, atbut lowsalt temperature, dependent 1970). On 1 8 . INTERACTIONS 39 the structured form is assumed to result from the interaction between separate strands, the strands being parallel (Hui Bon H o a et al, 1969).

This corresponds to the case of poly A. It was assumed that the stacked form has the torsional angles of one strand of R N A - 1 0 , while the torsional angles of the unstacked form correspond to one of the four sets of values given in the Table III. The values of the radii of gyration of a chain of D P = 1740 as a function of the fraction of unstacking are reported on Fig. 3. This shows that the unperturbed dimensions of unstacked poly A are slightly smaller than that of poly U. In fact, the dimensions of unstacked forms are probably independent of the nature of the bases.

6). Moreover, aminoacridines and ethidium cation can absorb and emit light in the visible region where biological macromolecules are transparent. This property allows to excite selectively the dye molecule thus facilitating the interpretation of experimental data in optical studies. In the following sections no attempt will be made to give a complete report on the very wide and complex subject of dye interaction with nucleic acids or polynucleotides (for a more detailed description see the survey of Blake and Peacocke, 1968).

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