They are called plectonemes. They are the analog of the twisted tangles of telephone cords, and can form in DNA that is pulled through a nanoscale channel. This is the finding of a study led by Ulrich ...

"It won’t be long before we know whether we are right or wrong,” remarked Professor Erio Tosatti when, in 2014, PNAS published a study by SISSA/ICTP carried out with Michele Fabrizio, Sandro Scandolo, ...