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. 2015 Jun 16;108(12):2833–2842. doi: 10.1016/j.bpj.2015.05.003

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© 2015 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Partitioning of total pressure, P, into contributions from hydration, P_hyd, van der Waals, P_vdw, and undulation interactions, P_und, for Ld (upper) and Lo (lower). The large open black circles show the values of the separation, d_W, at which hydration and undulation pressure are equal. The small offset, δ = 200 Pa, is necessary for plotting P = 0 on a logarithmic scale. δ is also responsible for the deviation of the hydration pressure from a straight line at low P. To see this figure in color, go online.