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LNCS 2950 - Aspects of Molecular Computing (Frontmatter Pages)

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start tile<br />

Transducers with Programmable Input by DNA Self-assembly 237<br />

computation tile<br />

a’<br />

b’<br />

S0 S0<br />

TX S1 S1<br />

TX<br />

S2<br />

a a<br />

b b<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

b<br />

input symbol<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111 input<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

00000000<br />

11111111<br />

a<br />

PX−JX device<br />

2<br />

000000000<br />

111111111<br />

000000000<br />

111111111<br />

000000000<br />

111111111<br />

000000000<br />

111111111<br />

000000000<br />

111111111<br />

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111111111<br />

000000000<br />

111111111<br />

000000000<br />

111111111<br />

b<br />

Fig. 13. Schematic view for a couple <strong>of</strong> first step computations. The linear array<br />

<strong>of</strong> DX and TX molecules that sets up the input is substituted only with a<br />

rectangle for each <strong>of</strong> the input symbol.<br />

Fig. 14.<br />

the bottom by in atomic force microscopy, (AFM) visualizations). The left side<br />

must contain an initiator (shown blunt at the top) and the right side will contain<br />

a terminator. The bottom assembly can be removed using the same Yurke-type<br />

techniques [28] that are used to control the state <strong>of</strong> the devices for removal <strong>of</strong><br />

the set strands. Successive layers can be added to the device by binding to the<br />

initiator on the left, and to the terminator on the right.<br />

For this task, we have prototyped the assembly <strong>of</strong> the central 4-diamond<br />

patterns, connecting them with sticky ends, rather than PX-JX2 devices. AFM<br />

images <strong>of</strong> these strings are shown on the left in Figure 14. We have also built a<br />

5-diamond system connected by devices. Its AFM pattern is shown on the right<br />

in Figure 14.<br />

a

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