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Pressure-induced transitions are associated with near 2-fold volume expansions. While an increase in volume with pressure is counterintuitive, the resulting new phases contain large fluid-filled pores, such that the combined solid + fluid volume is reduced and the inefficiencies in space filling by the interpenetrated parent phase are eliminated.

A transmission-electron microscope image of a collection of quasi-spherical nickel phosphide nanoparticles. A team led by Raymond Schaak of Penn State University has found that these nanoparticles can catalyze an important chemical reaction that generates hydrogen from water.

A well-defined plume of dust swept across the entire Atlantic Ocean on June 24, 2009. In this photo-like image taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite in three consecutive overpasses, the dust stretches from its origins in Africa’s Sahara Desert to the Lesser Antilles Islands on the eastern edge of the Caribbean Sea. Such spectacular dust storms are not uncommon.

1.NASA's Goddard Space Flight Center 2.此則是否有版權問題 原址：

The use of optical tweezers in order to measure the force in objects at nanometirc scale can be an interesting idea for the researchers in all fields, including biosciences. The use of the optical tweezers requires a comprehensive and exact understanding of its potential.

They lie dormant for years, but at the first sign of favorable conditions they awaken. This sounds like the tagline for a science fiction movie, but it describes the amazing life-cycles of microbial organisms that form the biological soil crusts (BSCs) of Earth's deserts. Now a research team with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) has reported a unique molecular-level analysis of a BSC cyanobacterium responding to the wetting and drying of its environment. The results hold implications for land management, improved climate change models, and a better understanding of carbon cycling in soil microbial communities and how changes in global temperatures impact Earth's deserts.

Assembly of the backbone of NASA's James Webb Space Telescope, the primary mirror backplane support structure, is a step closer to completion with the recent addition of the backplane support frame, a fixture that will be used to connect all the pieces of the telescope together.

This photo shows the ice front of Venable Ice Shelf, West Antarctica, in October 2008. It is an example of a small-size ice shelf that is a large melt water producer. The image was taken onboard the Chilean Navy P3 aircraft during the NASA/Centro de Estudios Cientificos, Chile campaign of Fall 2008 in Antarctica.

This graphic depicts the Mars Climate Sounder instrument on NASA's Mars Reconnaissance Orbiter measuring the temperature of a cross section of the Martian atmosphere as the orbiter passes above the south polar region.