When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Nitrogen is one of the essential nutrients for life on Earth, and some organisms, such as the ...

At some time in life's history, microorganisms started to make metabolically usable nitrogen from N 2 in the atmosphere. A provocative proposal accounts for the 'why and when' of that event. To what ...

Of all Earth's elemental cycles, nitrogen may be the most complex and costly. After all, it takes a lot of energy to turn the gaseous coupled nitrogen atoms that make up nearly 80 percent of our ...