A 10 kb DNA molecule labelled with digoxigenin and biotin is tethered between Streptavidin and anti-DIG coated microspheres held in double-trap optical tweezers. The DNA is stained with SYBR-gold and observed by epi-fluorescence imaging. The video shows many experiments, some with single DNA molecules between the beads, and some with two or more.
A brief glimpse of some surface-attached Qdots at the end.
Anders Wallin et al., 2009, University of Helsinki.
Post time: Jun-15-2017