Sentence examples for ratios of isotopes from inspiring English sources

Ratios of isotopes found in water vary from north to south largely because of temperature differences.

Then they analyzed them for ratios of isotopes of carbon and nitrogen.

The mission would also include a rover with sensors to look at ratios of isotopes for traces of past or present life and a seismograph to detect possible "marsquakes" that would show the planet is geologically active.

To zero in on the possible cultural interaction, archaeologists Dušan Borić of Cardiff University in the United Kingdom and T. Douglas Price of the University of Wisconsin, Madison, analyzed ratios of isotopes of strontium in the teeth of 153 skeletons from nine sites at the Danube gorges.

But a more rigorous approach, says Van Huissteden, would test the chemical makeup of the methane – gas from ancient geologic sources and recent biological ones will have different ratios of isotopes of carbon and hydrogen.

Stable isotope analysis compares differences in the ratios of isotopes of elements found in the tissues of prey and predators to gain information on diet.

As sulfur compounds, spewed out by volcanoes, float in the air, ultraviolet light hits them and breaks them apart, producing a ratio of isotopes later preserved in rocks.

But for certain animals, the ratio of isotopes of carbon and other elements in the hair can indicate whether the animals are eating grasses or trees and shrubs and how the water supply is changing.

This ratio of isotopes transfers to rainwater.

More recently, researchers have shown that the ratio of isotopes in feathers can provide a rough guide to where a bird has been feeding, because the feather ratios mirror those of food sources.

Using a tool called an ion microprobe, they measured the ratio of isotopes of carbon in apatite, "a mineral that acts as a protective capsule, preserving such chemical traces of life," says Arrhenius.