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DNA Assembled Nano-Transistors
Bob Vila's Hammer writes "In an article at New Scientist, researchers at the Technion-Israel Institute of Technology have harnessed DNA to mold a nano-transister constructed of graphite nanotubes coated in silver and gold. The carbon nanotube assembly when completed is a fully working transistor when voltage is applied. The process is ingenious, using proteins from E. Coli bacterium to bind carbon nanotubes to certain sites on strands of DNA. Then graphite nanotubes coated with antibodies connect to the proteins. Finally, silver ions are added to the solution which chemically bond with the DNA site where the protein is attached. Further refinement of the technique is required before full scale production would be efficient, but this could allow the creation of elaborate self-assembling DNA sculptures and circuitry."
I'm impressed by the ability to make components, but I think that creating structures of many components may prove to be the more difficult problem.
As an example, it might not be difficult to design a 1-bit memory cell that can be assembled this way, but how do you make an array of them that is exactly some number of cells on a side, and then attach the interface circuitry to the edges? This would seem to require giving the little buggers the ability to count (or measure), and then change their beheviour when a desired state had been attained.
The last time I checked, we know a fair amount about how living cells build proteins, but the problem of how the cells know when to build them and how to stick them together has barely been scratched.