The Sci-Fi Dream of a ‘Molecular Computer’ is Getting More Real
upstart writes:
David Leigh dreams of building a small machine. Really small. Something minuscule. Or more like ... molecule. "Chemists like me have been working on trying to turn molecules into machines for about 25 years now," says Leigh, an organic chemist from the University of Manchester in the United Kingdom. "And of course, it's all baby steps. You're building on all those that went before you."
In 1936, English mathematician Alan Turing imagined an autonomous machine capable of carrying out any precisely coded algorithm. [...]
Leigh now believes that tiny molecular versions of the Turing machine could assemble what we struggle to build in the organic realm, like new drugs and plastics with traits so enhanced and precise that they're out of reach for current tools. And he's confident that he can do it. "It's absolutely clear that it's possible," he says, "because there already is this working example called biology." Nature has given every life-form its version of the Turing machine: ribosomes, cellular structures that slide down sequences of mRNA to churn out proteins one amino acid at a time. No life on earth can function without them.
A molecular machine would work like a ribosome, in that instructions would be encoded on one molecule, and another one would interpret them, or read them out. Or, you can think of it a bit like a tape recorder, in that information is encoded on one molecule that serves as a track, and is read by a second molecule that serves as the reader "head" that plays it back.
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