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. 2013 Mar 5;110(12):4534–4538. doi: 10.1073/pnas.1220076110

Fig. 2.

Fig. 2.

DNA brush height and data collapse. (A) Brush height in units of evanescent decay length ξ ∼ 120 nm as a function of 968-bp DNA surface density and NaCl ionic strength, as deduced from the TIRF and epiFL profiles (color code bar in ionic strength). (B) Brush height as a function of ratio of density to ionic strength, σ/cs. Data includes NaCl height for density σ < 460 (in arbitrary fluorescence units, estimated 2,000 μm−2). Solid line represents scaling of height ∝ (σ/cs)1/3. (C) Height as a function of density for varying MgCl2 salt concentration. (D) Brush height as a function of ratio of density to ionic strength normalized by counterion valency, σ/csz2. Data includes z = 1 NaCl height (gray circle) and z = 2 MgCl2 (colored circle) for density σ < 460. Solid line represents scaling of h ∝ (σ/csz2)1/3.