This process, called the core-mantle differentiation, shaped the Earth's layered structure. But it was not just metals and rocks sorting themselves out—volatile elements like nitrogen ...

Scientists still needed to figure out this molecule's structure to be sure ... biochemist Erwin Chargaff found that the arrangement of nitrogen bases in DNA varied widely, but the amount of ...

The function of many biologically active molecules requires the presence of carbon-nitrogen ... transforms a molecule by introducing new functional groups into its structure.

Her PhD and post doctoral research was in molecular biology. She has previously written for Science, Creative Nonfiction, and Altasea. View Full Profile. Learn about our Editorial Policies. Most ...