Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream.

The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the mechanical anisotropy of ice. Here we show the spatial distribution of the depth-averaged horizontal anisotropy and corresponding directional flow-enhancement factors covering a large area of the Northeast Greenland Ice Stream onset.

Accelerating ice flow at the onset of the Northeast Greenland Ice Stream.

Mass loss near the ice-sheet margin is evident from remote sensing as frontal retreat and increases in ice velocities. Velocities in the ice sheet interior are orders of magnitude smaller, making it challenging to detect velocity change. Here, we analyze a 35-year record of remotely sensed velocities, and a 6-year record of repeated GPS observations, at the East Greenland Ice-core Project (EastGRIP), located in the middle of the Northeast-Greenland Ice Stream (NEGIS).

Artificial selection for structural color on butterfly wings and comparison with natural evolution.

Brilliant animal colors often are produced from light interacting with intricate nano-morphologies present in biological materials such as butterfly wing scales. Surveys across widely divergent butterfly species have identified multiple mechanisms of structural color production; however, little is known about how these colors evolved. Here, we examine how closely related species and populations of Bicyclus butterflies have evolved violet structural color from brown-pigmented ancestors with UV structural color.

Skeletal muscle metastases on FDG PET/CT imaging.

Background: Skeletal muscle metastases (SMM) are a rare occurrence despite the fact that skeletal muscle comprises more than 50% of total body mass. When present, most are asymptomatic and are often found incidentally on imaging. Several studies have reported isolated cases of patients with SMM.

Utility of panendoscopy for the detection of unknown primary head and neck cancer in patients with a negative PET/CT scan.

We conducted a retrospective review of the records of 23 patients who had been diagnosed with regionally metastatic head and neck squamous cell carcinoma from an unknown primary tumor. Our goal was to assess the utility of panendoscopy in locating the primary tumor in those patients whose positron-emission tomography/computed tomography (PET/CT) findings were negative. Overall, we found that PET/CT had correctly identified the unknown primary in 12 of the 23 patients (52%); panendoscopy confirmed this finding in all 12.