Abstract
The transition of simple aqueous saline solutions (buffered 0.1 M NaCl) of extremely long DNA (8 kilobases ≃ 2.7 μm ≃ 54 persistence lengths) from the isotropic to anisotropic phase was characterized by solid-state 31 P NMR spectroscopy and polarized light microscopy. The anisotropic phase first appeared in equilibrium with the isotropic phase at a concentration C i * = 13 mg/mL and the isotropic phase disappeared at a concentration C a * = 67 mg/mL. The first critical concentration (C i * ) is much lower than that observed for a stiffer polyelectrolyte (xanthan) and predicted by theory incorporating the influences of chain flexibility and charge
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