DNA hula

Yet another chance to use DNA as the material of choice in nanotechnology has been unraveled by Canadian researchers Michael Brook, Yingfu Li, and their colleagues at McMaster University, Ontario. The team has successfully produced periodic three-dimensional nanostructures from long single strands of DNA attached to gold nanoparticles. The secret lies in "rolling circle amplification" or the "hula-hoop" technique in which a particular polymerase enzyme duplicates a DNA strand and carries on working, separating the fresh double helix and making new copies without interruption. The researchers see nanocomputers, nanocircuits, and highly sensitive biosensors as potential areas of application.