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synopsisMeasuring the equivalent noise resistance of Na-DNA solutions in NaCl provides in formation about the free ion atmosphere. In an Arrhenius type diagram, the helix -+ coil transition is clearly brought out. A calculation of the number of free ions in the solution, as a function of temperature, reveals once more the process of ejection of compensating Na + ions from the macromolecules during the thermal transconformation.

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Eine Äquivalent‐Rauschleitfähigkeit An für wäßrige l‐1‐Elektrölyte wird auf der Grundlage der Langevin‐Gleichung definiert.