Phys. Rev. Lett. 84, 2533–2536 (2000)Do Free DNA Counterions Control the Osmotic Pressure?Received 21 June 1999; published in the issue dated 13 March 2000 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2533
DOI:
10.1103/PhysRevLett.84.2533
PACS:
87.14.Gg, 36.20.-r, 61.25.Hq, 87.15.-v
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