Sentences with phrase «isotope analyses showed»

Isotope analyses showed that while the first fall had separated from its parent body about 3 million years ago, the second object became detached about 50 million years ago.

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.

That dramatic idea encountered skepticism until an analysis of the lunar rocks showed that they have the same mix of oxygen isotopes as rocks found on Earth, strongly suggesting a shared origin.

Isotope analyses focused on 15N, which reflects dietary animal protein and 34S, which showed an increased amount of railway vegetation for rail - using bears in a previous study.

Analysis of isotope ratios in hair samples showed how much of the bears» diets came from human food.

Previous analyses of the isotopes in the bones of the 11 Stone Age individuals also showed the hugely different diet the two groups had.

The team showed through isotope analyses of meteorites that Jupiter's solid core formed within only about 1 million years after the start of the solar system history, making it the oldest planet.

«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.

3b) Analysis of carbon - isotope ratios shows that the additional carbon in the atmosphere is fossil carbon.

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).

[6] A spectral analysis of the American GISP2 isotope record [7] showed a peak of [18O: 16O] abundance around 1500 years.

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.