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2 Movement

Figure 2.15: (a) Interlocking DNA is used to create tubes (0.3–3 µm) and a “piston” to move within the

tubes. (b) Fluorescence is used to show the piston moves within the tube [32].

Figure 2.16: (a) Asymmetric polymer particles (“polymersomes”) incorporate two different enzymes. When

given their substrates, gas will be produced that will propel the polymersome forward. (b) The movement

of the polymersome is directional due to its asymmetric structure [33].