Sentences with phrase «stable isotopes show»

Stable isotopes show minimal differences between modern and ancient gray whale foraging ecology.

Not exact matches

Analysis of the water leaving Venus's atmosphere, however, shows that many of the hydrogen ions are actually a stable isotope of the element called deuterium, which consists of a proton and a neutron (rather than just a proton) in its nucleus.

Analyses of samples brought back from the Apollo missions in the 1970s showed that the Moon has the same abundances of the three stable isotopes of oxygen as Earth.

By using isotopic tracers called stable isotopes, researchers showed that seabirds feeding in areas rich in sulfate (a chemical that is an important food for sulfate - reducing bacteria that help break down organic matter) had high levels of mercury.

The team went on to show that supplementing heavy stable isotope - labeled forms of these precursors led to incorporation of heavy amino acids into proteins produced in enzyme expressing cells.

«This has enabled the stable - isotope analysis to show how his environment changed at different times in his life and, perhaps most significantly, identified marked changes in his diet when he became king in 1483.

Use of stable isotope tracers would also be of particular value as they would allow for in vivo assessments of post-treatment alterations various aspects of hepatic metabolism including glucose metabolism, fat oxidation and VLDL - kinetics which have been shown to be altered by acute periods of ER.101 Increased Stress Resistance

Stable isotope results show only very slight differences between ancient and modern whales, indicating the hypothesis of population substructure in the past around the area of the Olympic peninsula / Vancouver Island remains a possibility and warrants further investigation using larger sample sizes.

This analytical document shows that stable isotope ratios can be used to monitor changes in the character of precipitation in response to periodic variability or changes in climate.

It is appropriate as this point to add that if Bolin & Eriksson's conditions in the last paragraph were true, carbonated beer (Bohren, 1987) and soda «pop» as we know it would be an impossibility with their «buffer» factor (see below); rain and fresh water would not show the observed equilibrium pH of 5.7 (Krauskopf, 1979); and experiments would not had shown complete isotopic equilibrium between CO2 and water in just hours, which in turn is the prerequisite for routine stable isotope analysis involving CO2 (Gonfiantini, 1981).

The chart shows the stable isotope data.

Both radioactive and stable carbon isotopes show that the real atmospheric CO2 residence time (lifetime) is only about 5 years, and that the amount of fossil - fuel CO2 in the atmosphere is maximum 4 %.

Molecular dating and stable isotope analyses also show that by very early in their evolutionary history, polar bears were already inhabitants of the Artic sea ice and had adapted very rapidly to their current and unique ecology at the top of the Arctic marine food chain.