Figure 4.

Results of control experiments with fully noncomplementary DNA. The extent of DNA adsorption, measured by in situ SPR under the same experimental conditions as for Fig. 2 (1 μM oligomer in 1 M NaCl) for the fully noncomplementary control oligomer at open circuit and at +300 mV (gray open squares and gray solid circles, respectively). The data are shown on the same scale as the electrostatically assisted hybridizations of Fig. 2. For comparison, the data for the fully complementary match sequence at +300 mV (same data as in Fig. 2) are also shown (black solid circles).