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. Author manuscript; available in PMC: 2012 Jun 20.
Published in final edited form as: Nanoscale. 2010 Nov 19;3(2):581–591. doi: 10.1039/c0nr00479k

Figure 2.

Figure 2

(a) Linear response of electromagnet field and field gradient with applied current at a distance of 0.5 mm. (b) Magnetic field versus distance at 0.94 A applied current. The magnetic field gradient (dashed line) at a distance of 0.5 mm from the bead is ~55 T m−1. (c) Probe fluorescent intensities as a function of distance at two actuator positions 0.150 cm (solid) and 0.200 cm (dashed). (d) Colorized probe image versus electromagnet current for stretching 200-mer ssDNA. Upon applying force to the probes, we observe a noticeable change in intensity, which depends non-linearly on the current applied to the electromagnet.