Changes in diet between foodstuffs of similar isotopic
composition will not produce a change in consumer bone collagen stable isotope ratios.
Stable carbon and nitrogen isotopic
fractionation between diet and tissue of captive red fox: implications for dietary reconstruction.
Because natural variations in calcium isotopic
compositions are, with very rare exceptions (3), strictly dependent on the relative masses of the isotopes, it is possible to calculate the complete isotopic
composition of a calcium sample from the ratio of any 2 isotopes (4, 5).
His laboratory was also the first to demonstrate terrestrial variations in the isotopic
compositions of boron and selenium.
Diet selection, however, will not necessarily be the sole mechanism determining the isotopic
ratios observed at the individual level, because biochemical processes within the animal can result in high variability in fractionation and assimilation of different isotopes (Fig.
Based on field relationships and geochronological data it is believed that many of these plutons are related to the Wathaman Batholith with differences in chemical and isotopic
properties due to their emplacement predominantly within the accreted arc terranes.
By using techniques that are over 100 times more sensitive to changes in the isotopic
composition of metals than anything currently used by clinicians, the researchers were able to show that they could detect key differences in zinc caused when cancer subtly alters the way that cells process the metal.
Given it is very unlikely that both Theia and Earth had identical isotopic
compositions (as all other known solar system bodies, except the Moon, appear to be different) this paradox casts doubt over the dominant theory for the Moon formation.
Measuring trace N2O concentrations and their isotopic
signatures will help scientists better understand manmade influences on the environment, climate change and the nitrogen cycle, including the influence of nitrate runoff from intensified agricultural activity.
Islamic glasses are thought to have been made from a mixture of plant-ash and ground quartz pebbles/sand; the chemical and isotopic
Although this scenario makes sense when you look at the size of the moon and the physics of its orbit around Earth, things start to break down a little when you compare their isotopic
compositions--the geological equivalent of a DNA "fingerprint.
Now, new isotopic
measurements by researchers at NASA's Goddard Space Flight Center reveal that an ocean once covered approximately twenty percent of the Martian surface.