Figure 4.

Current blockade histograms in different experiment conditions. (a) In 1 M KCl solution for the 20-nm diameter nanopore, (b) in the mixed solution with 0.5 M KCl + 0.5 M MgCl2 for the 20-nm diameter nanopore, (c) in 1 M MgCl2 solution for the 20-nm diameter nanopore, and (d) in 1 M MgCl2 solution for a 7-nm diameter nanopore.

Zhang et al. Nanoscale Research Letters 2013 8:245   doi:10.1186/1556-276X-8-245
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