Watching molecules ’dance’ in real time

A new technique which traps light at the nanoscale to enable real-time monitoring of individual molecules bending and flexing may aid in our understanding of how changes within a cell can lead to diseases such as cancer. It's like having an extremely powerful magnifying glass made out of gold - Jeremy Baumberg A new method which uses tightly confined light trapped between gold mirrors a billionth of a metre apart to watch molecules 'dancing' in real time could help researchers uncover many of the cell processes that are essential to all life, and how small changes to these processes can lead to diseases such as cancer or Alzheimer's. Researchers from the University of Cambridge have demonstrated how to use light to view individual molecules bending and flexing as they move through a model cell membrane, in order to better understand the inner workings of cells. Details are published today (12 August) in the journal Scientific Reports . The membrane is vital to the normal functioning of cells; keeping viruses out but allowing select molecules, such as drugs, to get through. This critical front line of cellular defence is made up of a layer of fatty lipids, just a few nanometres (one billionth of a metre) thick. When the cell membrane is damaged however, unwanted invaders can march into the cell.