British scientists tie the tightest knot ever

Christian Science Monitor | Science 

January 17, 2017 --Knots have been around for thousands of years. But now, a team of researchers from the University of Manchester has added a new twist to one of the most basic technologies known to humans. Using cutting-edge chemical techniques, the researchers have created the tightest knot ever made, woven on a molecular level. The new knot is a circular triple helix only 20 nanometers long, containing only 192 atoms, the researchers report in a paper published in the Jan. 13 issue of Science magazine. While scientists have known for decades that molecular knots like this one are theoretically possible, it has proven difficult to create knots of such complexity, with previous molecular knots using only two strands woven together in very basic patterns.

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