Tianqi Song and John Reif, Duke University (IMAGE)
Caption
Duke graduate student Tianqi Song and computer science professor John Reif have created strands of synthetic DNA that, when mixed together in a test tube in the right concentrations, form an analog circuit that can add, subtract and multiply as the molecules form and break bonds. While most DNA circuits are digital, their device performs calculations in an analog fashion, without requiring special circuitry to convert signals to zeroes and ones first.
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Photo by John Joyner
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