http://phys.org/news/2013-07-molecule-movements-cells.html
“...The newly developed STED-RICS microscopy method records rapid movements of molecules in live samples.
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...STED fluorescence microscopy allows to pursue the movements and interactions of biomolecules in live samples with high spatial and temporal resolution. For this purpose, the structures to be studied are marked selectively using fluorescent dyes. Then, changes with time can be videotaped. However, the image sequence is rather slow, such that rapid molecule movements cannot be recorded directly. A group of KIT researchers around Professor Gerd Ulrich Nienhaus from the Institute of Applied Physics (APH) and the Center for Functional Nanostructures (CFN) now presents a new method to measure such rapid molecule movements in live samples in the Nature Communications journal.
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-pity they don't give examples of videos of this (moving molecules) on the link.