The unnatural order of things

The ability of DNA to self-assemble into a variety of nanostructures and nanomachines is being exploited by a growing number of researchers. Although it is difficult to overstate the importance of DNA in biology, this famous molecule is also becoming more prominent in nanotechnology. The appeal of DNA to nanoscientists is three-fold first, it is a natural nanoscale material second, a large number of techniques for studying DNA are already available and third, its ability to carry information...

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0 10 20 30 40 50 60 70 Time (psx10-3) Figure 2 Stochastic nature of reversible unbinding of oligomeric calix 4 arene dimers as a function of pulling velocity. a,b, Stretching and subsequent rupturing of structure 6 at 1,500 pN s21 (a) and 30,000 pN s21 (b). The red lines are wormlike chain (WLC) fits to the data with a persistence length lp 0.37 nm. The changes in contour length DL as obtained from the fitting procedure lie between 1 and 2 nm. Six capsules break subsequently, while seven...

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Figure 3 Assembly of enzyme cascades or cofactor-enzyme cascades on hexagon-like DNA scaffolds, their imaging and their functional characterization. a, Assembly of the GOx and HRP enzymes on the two-hexagon (I) and four-hexagon (II) strips. b, (I) AFM image and cross-sectional analysis of the GOx HRP enzymes assembled on the two-hexagon strip. (II) AFM image and cross-sectional analysis of the GOx HRP enzymes assembled on the four-hexagon strip. (III,IV) Confocal microscopy images of the...

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600 800 1,000 1,200 1,400 1,600 Wavelength nm Figure 3 Optical transmission characteristics of ITO nanowire layers. a, Transmission measurements of an ITO nanowire layer deposited at substrate temperatures of Tsub 575 C red curve and 450 C green curve at a nominal growth rate of 0.05 nm s21 and an invariant oxygen partial pressure of 2.1 x 1024 mbar. The inset shows an ITO nanowire layer deposited on a glass cover slip. b, Reflectance spectra for a thin ITO antireflection coating blue curve , a...