Fig. 2: Sustained unidirectional rotation of DNA origami turbines in a salt gradient.
From: A DNA turbine powered by a transmembrane potential across a nanopore
a, Schematic of a DNA turbine docking onto a nanopore by diffusiophoresis. b, Typical heatmap (blue pixels) of obtained centres of fluorophores at the tip of DNA bundle from single-particle localizations from 8,000 frames (Methods) and example trajectory of six subsequent positions of the labelled tip (red), which shows clear directional rotation. c, Typical cumulative angle versus time for a right-handed turbine in 50 mM:1 M NaCl, showing a sustained rotation of hundreds of turns. d,e, Cumulative angle versus time of left-handed (d) and right-handed (e) turbines for a NaCl concentration gradient of 50 mM:1 M (n = 77 and 151, respectively). f, Average rotation speed of left- and right-handed turbines in transmembrane NaCl concentration gradients of 50 mM:500 mM and 50 mM:1 M (n = 98, 141, 124 and 74, respectively). In all box plots: centre line, median; box limits, upper and lower quartiles; whiskers, 1.5 × interquartile range.
