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Schematic shows TiO2 nanowires (blue) grown on the upper half of a Si nanowire (gray) and the two absorbing different regions of the solar spectrum. Insets display photoexcited electron−hole pairs separated at the semiconductor-electrolyte interface to carry out water splitting with the help of co-catalysts (yellow and gray dots).

These false-color SEM images reveal microscopic flower structures created by manipulating a chemical gradient to control crystalline self-assembly.

The pale rock in the upper center of this image, about the size of a human forearm, includes a target called "Esperance," which was inspected by NASA's Mars Exploration Rover Opportunity. Data from the rover's alpha particle X-ray spectrometer (APXS) indicate that Esperance's composition is higher in aluminum and silica, and lower in calcium and iron, than other rocks Opportunity has examined in more than nine years on Mars. Preliminary interpretation points to clay mineral content due to intensive alteration by water.

NASA's Solar Dynamics Observatory captured this image of the X1.2 class solar flare on May 14, 2013. The image show light with a wavelength of 304 angstroms.

A dead E. coli bacterium collected in a filter after treatment with the Stanford nanoscavenger.

After four days, quantum dots still shine (green) in cells embedded in a hydrogel scaffold.

At the heart of the instrument is a high specification quadrupole mass filter assembly, featuring a precision machined 19mm quadrupole rod set with RF-only pre- and post-filter stages, stabilizing rods and the latest high stability CS Series RF generator that in combination deliver exceptional transmission, resolution and abundance sensitivity characteristics at low masses.

Quantum Dots doped with copper.

The U.S. space agency, NASA, says astronauts aboard the International Space Station will perform a previously unscheduled spacewalk Saturday to deal with an ammonia coolant leak outside the station. The short-notice spacewalk came together after teams on Earth and in space quickly readied a plan of action.

Topographic STM images of a TCNQ monolayer on graphene.