heavy nitrogen

American  

noun

1. the stable isotope of nitrogen having a mass number of 15.

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Example Sentences

In general, samples collected from sites associated with high habitation had the most heavy nitrogen and were also in a poorer state.

From BBC

Scientists aren't sure whether heavy nitrogen ice eroded the lighter water ice to create the depressions.

From Nature

On Mars the ratio of heavy nitrogen, which has an extra neutron in its nucleus, to regular nitrogen is twice that of Earth.

From New York Times

By comparing the nitrogen isotope ratios in the food and human blood samples, they were able to estimate how much heavy nitrogen the human body stores.

From Scientific American

The next day, the worms had crawled onto the leaves, and the team was able to detect the heavy nitrogen isotope from the worm in the plant's tissues.

From Science Magazine