Programmable Periodicity of Quantum Dot Arrays with DNA Origami Nanotubes

To fabricate quantum dot arrays with programmable periodicity, functionalized DNA origami nanotubes were developed. Selected DNA staple strands were biotin-labeled to form periodic binding sites for streptavidin-conjugated quantum dots. Successful formation of arrays with periods of 43 and 71 nm demonstrates precise, programmable, large-scale nanoparticle patterning; however, limitations in array periodicity were also observed. Statistical analysis of AFM images revealed evidence for steric hindrance or site bridging that limited the minimum array periodicity

Sea state and boundary layer physics of the emerging arctic ocean

The Office of Naval Research initiated a Department Research Initiative (DRI) titled Sea State and Boundary Layer Physics of the Emerging Arctic Ocean. The central hypothesis of the 'Sea State' DRI is that surface waves now have a much greater role in the contemporary Arctic Ocean. Indeed, the entire Arctic Ocean in summer may soon resemble a marginal ice zone (MIZ). The Sea State DRI will use a combination of modeling, in situ observations, and remote sensing to address the following science objectives: 1. Develop a sea state climatology for the Arctic Ocean 2. Improve wave forecasting in the presence of sea ice 3. Improve theory of wave attenuation/scattering in the sea ice cover 4. Apply wave-ice interactions directly in integrated arctic system models 5. Understand heat and mass fluxes in the air-sea-ice syste