Abstract
The contribution of counterions to macroscopic properties of isotropic
DNA solutions has been studied using osmotic pressure measurements
in low added salt condition. In the high DNA concentration range,
the counterion contribution prevails and the associated osmotic coefficient
is equal to 0.245 +/- 0.020. In the lower concentration range, the
osmotic pressure may be exerted either by polymers or by ions, or
due to a combination of both effects, depending on the added salt
and DNA concentrations.
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