The ulimate TJ/Mq dream fusion fantasy... :O)
Oh, My Stars and Hexagons! DNA Code Shapes Gold Nanoparticles
sciencedaily.com
Gold nanoparticles are made by sewing tiny gold seeds in a solution of gold salt. Particles grow as gold in the salt solution deposits onto the seeds. Lu's group incubated the gold seeds with short segments of DNA before adding the salt solution, causing the particles to grow into various shapes determined by the genetic code of the DNA.
The DNA alphabet comprises four letters: A, T, G and C. The term genetic code refers to the sequence of these letters, called bases. The four bases and their combinations can bind differently with facets of gold nanoseeds and direct the nanoseeds' growth pathways, resulting in different shapes.
In their experiments, the researchers found that strands of repeating A's produced rough, round gold particles; T's, stars; C's, round, flat discs; G's, hexagons. Then the group tested DNA strands that were a combination of two bases, for example, 10 T's and 20 A's. They found that many of the bases compete with each other resulting in intermediate shapes, although A dominates over T. |
