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. Author manuscript; available in PMC: 2013 Dec 17.
Published in final edited form as: J Am Chem Soc. 2012 Jan 17;134(4):10.1021/ja208436p. doi: 10.1021/ja208436p

Figure 4.

Figure 4

A simple theoretical model, which considers only enthalpic (electrostatic) and entropic (excluded volume) contributions to the folding free energy which contains either no fitted parameters (solid line; see text for model details), or one fitted parameter-the pcz- (dashed line) fits our observations with reasonable accuracy. This, in turn, suggests that our knowledge of these effects (including prior theoretical estimates of the magnitude of the excluded volume effect) is reasonably complete and accurate and that any non-specific interactions between the DNA and our SAM-coated gold surface are negligible. The gre bar, which represents ±1 kT, is shown for scale.