Researchers have uncovered compelling evidence about the elusive structure of a high-pressure phase of solid nitrogen.

Edited* by Daniel L. Hartl, Harvard University, Cambridge, MA, and approved June 30, 2010 (received for review April 29, 2010) The human gut “metagenome” is a complex consortium of trillions of ...

A large proportion of the total carbon in the World Ocean is in the form of dissolved organic matter (DOM), which is comparable in mass to the carbon in atmospheric CO2. A major source of this ...

† Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2W2 ‡ Division of Analytical and Environmental Toxicology, University of Alberta, Edmonton, ...