Shaken, not stirred: Scientists spy molecular maneuvers

Stir this clear liquid in a glass vial and nothing happens. Shake this liquid, and free-floating sheets of protein-like structures emerge, ready to detect molecules or catalyze a reaction. This isn't the latest gadget from James Bond's arsenal -- rather, the latest research from the Berkeley Lab scientists unveiling how slim sheets of protein-like structures self-assemble.

Lipid monolayers herald a new class of ultrathin dielectric

Lipids are the main component of the outermost membrane of cells. Their role is to seperate the inner and outer media of the cell and prevent any ionic current between these two media. Because of this last property, lipid layers can be thought of as good ultra-thin insulators that could be used in the development of electronic devices. So far though, because of their inherent instability in air, their use in advanced processes has been limited. This might change, though, since researchers in France have shown the possibility to stabilize by polymerization a lipid monolayer with a thickness of 2.7 nm directly at the surface of H-terminated silicon surface therefore opening a whole new world of possibilities of the use of these layers. Now, they reported the electrical performance of stabilized lipid monolayers on H-terminated silicon.

Carbon nanostructures for easier detection of Parkinson’s disease

Dopamine deficiency is indicative of serious diseases of the nervous system. Tests of dopamine concentration are expensive and require specialised equipment that is unavailable in doctors' offices. New electrodes coated with carbon nanoparticles deposited on silicate submicroparticles allow to detect dopamine in solutions easily and at low cost, even in the presence of interferences.

Nanowires are more heterogeneous than anticipated

With few exceptions, optical investigations on nanowires have so far been carried out almost exclusively by conventional optical microscopy, which has limited spatial resolution. Researchers have now developed a new method, called tip-enhanced near-field microscopy, which makes use of a tapered metal tip as an optical antenna.