Life on Earth has always depended on nitrogen. As a building block of proteins and DNA, nitrogen is essential to all living organisms. Yet, despite its abundance in the atmosphere, nitrogen gas is ...

Those sources have nitrogen isotope fractions that differ from those on Earth. So how did nitrogen get to Earth in the first place, and where did it come from?

This is a preview. Log in through your library . Abstract Concentrations and natural isotope abundance of total sulfur and nitrogen as well as sulfate and nitrate concentrations were measured in ...

The nitrogen abundance of the silicate Earth is a result of both early evolution and late-stage accretion, but the contribution of late-stage accretion to the abundance of other volatiles is limited.

Since ammonia is the major carrier of nitrogen in a comet, it is necessary to clear it from the relative abundance of its isotopes to understand how 15 NH 2 separates in cometary molecules.

With seven protons and two neutrons, the lopsided atomic nucleus of nitrogen-9 pushes the limits of what can even be considered a nucleus.

When modern microbes use nitrogen in their metabolism, they use these two isotopes in a certain ratio to each other.

Isotopes can also point to weather conditions sustained by an individual (people who live in arid environments, for example, contain more nitrogen-15) or suggest how populations moved.

The most accurate measurement yet of the relative proportions of nitrogen-15 and nitrogen-14 in Jupiter's atmosphere has placed important constraints on the make-up of the solar nebula - the cloud of ...

Stable isotopes are non-radioactive forms of atoms. Although they do not emit radiation, their unique properties enable them to be used in a broad variety of applications, including water and soil ...