Reversible photo-switching of single azobenzene molecules in controlled nanoscale environments.

We drive reversible photoinduced switching of single azobenzene-functionalized molecules isolated in tailored alkanethiolate monolayer matrices on Au{111}. We designed molecular tethers to suppress excited-state quenching from the metal substrate and formed rigid assemblies of single tethered azobenezene molecules in the domains of monolayer to limit steric constraints and tip-induced and stochastic switching effects. Single molecules were reversibly photoisomerized between trans and cis conformations by cycling exposure to visible and UV light.

Extensor tendon injury to the index and middle finger secondary to Kirschner wire insertion for a distal radial fracture.

We describe a case with the highly unusual complication of attritional ruptures to both the extensor tendons to the index and middle finger following Kirschner wire placements for a distal radial fracture. This particular complication has never been previously described in the literature. We also review the literature, identifying certain techniques in the management of distal radial fractures with Kirschner wires which are considered to increase the risk of tendonous or neurovascular injury.