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Under inverted fluorescence microscope, the multi-walled carbon nanotubes-ethylenediamine-nerve growth factor complexes significantly induce PC12 cell differentiation, and the growing protuberances are long, dense, and woven into meshes (× 200).

A single layer of organic molecules connects the positive and negative electrodes in a molecular-junction OLED.

Phase 1 Skin injury, Phase 2 Application of the solution, Phase 3 Using pressure to hold the edges together, Phase 4 Skin closure. Illustration of the first experiment conducted by the researchers on rats: a deep wound is repaired by applying the aqueous nanoparticle solution. The wound closes in thirty seconds.

Brightpoints in the sun's atmosphere, left, correspond to magnetic parcels on the sun's surface, seen in the processed data on the right. Green spots show smaller parcels, red and yellow much bigger ones. Images based on data from NASA's SDO captured at 8 p.m. EDT on May 15, 2010.

An artist's concept of NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft seen orbiting near the surface of the moon.

This figure from the paper shows the X-ray destruction of human breast cancer cells using Cu-Cy particles. The images show the live cancer cells stained green and the dead cells stained red.

In equilibrium (top), the charge stripe "ripples" run perpendicular to each other between the copper-oxide layers of the material. When a mid-infrared laser pulse strikes the material (middle), it "melts" these conflicting ripples and induces superconductivity (bottom). The experimenters used a carefully synchronized x-ray laser to take this femtosecond–fast "movie" to reveal how quickly the charge stripes melt.

This new image from ESO’s La Silla Observatory in Chile reveals a cloud of hydrogen called Gum 41. In the middle of this little-known nebula, brilliant hot young stars are giving off energetic radiation that causes the surrounding hydrogen to glow with a characteristic red hue.