Sentences with phrase «isotope composition»
The phrase "isotope composition" refers to the different forms (or variants) of atoms within a substance. It indicates the specific types of atoms and their relative amounts present in a sample. Full definition
Cope IL, Wilkinson JJ, Boyce AJ, Herrington RJ (2010) Oxygen Isotope Composition of Hematite: Pic de Fon Deposit, Republic of Guinea, West Africa.
nhm.ac.uk
Mean values ± standard deviation of methane concentrations (as milligrams of CH4 L - 1) and carbon isotope composition in methane in shallow groundwater δ13C - CH4 sorted by aquifers and proximity to gas wells (active vs. nonactive)
By studying the carbon isotope compositions of barley plants and their relationship with water - use efficiency, the researchers developed tools that plant breeders can use to improve selection efficiency for more water - efficient varieties.
The researchers looked at the nitrogen stable isotope composition of different members of the food web at suburban ponds.
Better understanding of the mechanisms associated with the atmospheric water budget based on isotope composition is the objective of the MUSICA project coordinated by Schneider at IMK.
The thorough mixing of this atmosphere explains the identical isotope composition of Earth and Moon, Wang said.
The second method involved measuring the spread of air with water molecules with different isotope composition in the layers with the compressed snow.
[2] The oxygen isotope composition refers to the relative abundance of oxygen's two main stable isotopes, oxygen - 16 (16O) and oxygen - 18 (18O).
They then performed chemical extraction on the samples to analyze the sulfur isotope compositions in order to estimate the chemistry of the global ocean.
The meteorites represent Earth's «building blocks» and, thus, yield the original uranium isotope composition of Earth as a whole, and also the undisturbed mantle.
«As an animal eats and drinks, the local strontium isotope composition of the water, plants and animals consumed is recorded in its skeletal tissues.»
Otolith O and C Stable Isotope Compositions of Southern Bluefin Tuna Thunnus maccoyii (Pisces: Scombridae) as Possible Environmental and Physiological Indicators.
«We looked at ice cores and tropical sponge records, which give us reliable proxies for the carbon isotope composition of atmospheric carbon dioxide.
In the decades following the discovery of the PETM, numerous other hyperthermals have been discovered, marked by coeval excursions in the carbon and oxygen isotope compositions of benthic foraminifera and bulk sediment.
The thorough mixing of this atmosphere explains the identical isotope composition of the Earth and moon, Wang said.
In analyzing the oxygen - isotope compositions in both sets of samples, they showed a very small 3 to 4 parts per million difference between the two.
Leaf - eating colobines today exhibit strong preferences for arboreal habitats, and the carbon isotope compositions of the fossil teeth are consistent with dense to open forest arboreal feeding (see figure).
Both the eggshells and the embryo bones were analyzed in order to determine their oxygen isotope composition.
Taking these measurements into account, the researchers — assisted by a physiologist colleague — were able to model the different developmental stages integrating the oxygen isotope compositions.
The examination of the isotope composition of individual amino acids in the collagen shows that the bears lived on a strictly vegan diet.
Based on the isotope composition in the collagen of the bears» bones, they were able to show that the large mammals subsisted on a purely vegan diet.
During a campaign above the sea near the Canary Island of Tenerife, the scientists conducted six measurement flights to determine the isotope composition of water vapor up to 7 km height.
For the first time, the researchers have proved that both the worldwide measurement network NDACC with its ground stations and modern weather satellites provide reliable global data for the isotope composition of tropospheric water vapor.
The isotope composition of water vapor, i.e. the ratio of light and heavy water molecules, provides insight into underlying mechanisms.
A Cologne working group involving Prof. Carsten Münker and Dr. Elis Hoffmann and their student Sebastian Viehmann (working with Prof. Michael Bau from the Jacobs University Bremen) have managed for the first time to determine the isotope composition of the rare trace elements Hafnium and Neodymium in 2.7 - billion - year - old seawater by using high purity chemical sediments from Temagami Banded Iron Formation (Canada) as an archive.
However, there is no evidence, based on the HED meteorites, to suggest that Vesta is heterogeneous as all have the same oxygen isotope composition.
«It is based on a sophisticated statistical analysis of the isotope composition of sediment in old French wines.
Figure 1: Temperature anomaly calculated from oxygen isotope composition.
If you want a new theory, make sure it matches the observations of methane as well and also accounts for the isotope composition of both in ice cores.
However, the point you make about storm tracks etc. can be parsed into the widely recognised issues of measuring the isotope fractionation between a carbonate mineral and its source water when there is no way to estimate the source water isotope composition.
Here, we calculate tightly constrained estimates of ca using a universal equation for leaf gas exchange, with key variables obtained directly from the carbon isotope composition and stomatal anatomy of fossil leaves.