the conversion of atmospheric nitrogen into the compounds by natural processes, such as lightning, and 4) biological nitrogen fixation (Vance 2001). The reduction of atmospheric nitrogen is a ...

Although nitrogen is very abundant in the atmosphere, it is largely inaccessible ... The major transformations of nitrogen are nitrogen fixation, nitrification, denitrification, anammox, and ...

Just like today, early life on Earth was therefore dependent on nitrogen fixation by microbes. In other words, on their conversion of atmospheric nitrogen into nitrogen compounds that living ...

Until recently only a few microorganisms were thought to fix the nitrogen of the atmosphere in the form essential to higher plant and animal life. Now a number of others have been found ...

Research into bacteria strains that are both competitive and efficient in nitrogen fixation and developing plants with those ...

This is when bacteria in the soil convert the nitrate back into nitrogen gas which then gets released back into the atmosphere.

Most organisms require nitrogen to produce biological molecules, such as nucleotides and amino acids, but until recently, only prokaryotes were known to fix nitrogen from the atmosphere ... and for ...

The nitrogen-15 isotopic technique is also used to quantify the amount of nitrogen fixed from the atmosphere through biological nitrogen fixation by leguminous crops. The carbon-13 isotope signature ...