Sentences with phrase «isotope analysis in»

That the increasing amounts of CO2 in the atmosphere come from fossil fuels was already demonstrated by isotope analysis in the 1950s.

Applicability of stable C and N isotope analysis in inferring the geographical origin and authentication of commercial fish (Mackerel, Yellow Croaker and Pollock)

Not exact matches

The rover's Sample Analysis at Mars (SAM) instrument that analyzes the soil and atmosphere around the rover using a mass spectrometer, a gas chromatograph and a tunable laser spectrometer to detect oxygen and carbon isotopes in carbon dioxide and methane samples to see if they are biochemical in origin.

Bone isotope analysis of babies who died in infancy?

The theory is based on new analysis of xenon isotopes detected by scientists from the V.G. Khlopin Radium Institute in the Leningrad, four days after the accident, at Cherepovets, a city north of Moscow far from the major track of Chernobyl debris.

Upon analysis, the samples» carbon isotope values revealed an exceptionally arid region deep in Asia's interior going back 23 million years, initially ringed by areas of higher rainfall.

Second, analysis of isotopes, which can distinguish among sources of emissions, demonstrates that the majority of the increase in carbon dioxide comes from combustion of fossil fuels (coal, oil and natural gas).

A 2004 analysis of strontium isotopes, which vary according to regional geochemistry, suggested that some Beaker - associated individuals did migrate in their lifetimes.

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.

The researchers used stable isotope analysis, a chemical assay of a tissue biopsy that provides an integrative view of what the animal ate in previous months.

The problem is that nearly all off - the - shelf statististical packages that evolved from using isotopes only allow for analysis in two dimensions.

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.

In his talk, Agee presented the results of the isotope analysis for oxygen as well as hydrogen.

«A lot of this rests on the carbon isotope analysis,» Rothman says, which is exceptionally strong and clear in this part of the geological record.

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.

The new analysis «is an elegant example of how to use the geochemistry of a fossil to infer the behavior and movement of an ancient creature,» says Henry Fricke, an isotope geochemist at Colorado College in Colorado Springs.

The team based its analysis on ratios of oxygen and hydrogen isotopes in ice cores drilled in East Antarctica.

A subsequent isotope analysis makes it possible to determine the precise percentage of ice - algae carbon in the fish's diet.

He also stresses that the way we look at prehistoric times is changing radically thanks to genetics, isotope analysis and geophysical methods as well as developments in geographic information systems and remote sensing.

Isotope analyses confirm an itinerant life style, well in tune with the martial society that dominated 8th to 10th century northern Europe.

It's not clear why this mega-marsupial, which weighed up to 2,800 kilograms, migrated, but an analysis of carbon isotopes in the tooth suggests that D. optatum ate a fairly limited diet.

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

Knudson and Ravelo based their findings on an analysis of carbon and oxygen isotopes in the calcium carbonate shells of tiny marine organisms called foraminifera, which are preserved in seafloor sediments.

Participation in the project will be entirely voluntary, and will test whether there is the potential for these investigations to be supported by wider use of DNA testing and isotope analysis.

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 next step, she says, is to use stable isotope analysis to see if the Mexican turkeys had high levels of corn in their diets — a sign that they were being fed by humans.

Because C4 plants concentrate more of carbon's heavier isotopes compared with C3 plants, a technique called stable isotope analysis — which measures the relative concentrations of isotopes in animal bones — can often detect which plants predominate in the diet.

Based on radiometric dating and geochemical isotope analysis, Czaja characterizes his fossils as having formed in this early Vaalbara supercontinent in an ancient deep seabed containing sulfate from continental rock.

The difference between using DNA analysis and isotope tracking is a variation on the nature versus nurture debate: DNA records an organism's genetic inheritance, and isotopes reflect the composition of the environment in which it grows.

An isotopes analysis was used to determine that many pieces of turquoise found in New Mexico's Chaco Canyon came from as far away as Nevada

Analyses revealed that the long - incubated fluids contained low concentrations of methane with a lower - than - normal concentration of the carbon - 13 isotope — a sure sign that methane - producing microorganisms were living in the fluid, the researchers report online today in Science.

This size reduction could be linked to the spread of semi-free foraging practices of cattle during the Early Middle Ages, a trend seen elsewhere in Europe and which has been confirmed by the analysis of stable isotopes; this work was carried out by the research group which Idoia Grau belongs to and was published a few months ago in Quaternary International.

In recent years, art historians have deployed increasingly sophisticated scientific tools — from analysis of isotopes to infrared reflectography — to evaluate the authenticity of artworks.

«Watching a forest breathe: Using highly sensitive isotope analysis, a research team has obtained detailed measurements of carbon exchange in a temperate forest.»

This size reduction could be linked to the spread of semi-free foraging practices of cattle during the Early Middle Ages, a trend seen elsewhere in Europe and which has been confirmed by the analysis of stable isotopes; this work was carried out by the research group which Idoia Grau belongs to and was published a few months ago in «Quaternary International» (http://www.sciencedirect.com/science/article/pii/S1040618214003516).

Analysis of the stable isotope control data was funded in part by a grant from the Fishmongers» Company, one of London's medieval Livery Companies, which retains responsibility for quality control at London's Billingsgate fish market.

By combining RPO results with analyses of radiocarbon (a radioactive isotope of carbon with a half - life of 5,730 years) and stable carbon isotopes, scientists can identify the sources and ages of organic matter in the environment.

«Laser ablation isotope ratio mass spectrometry for enhanced sensitivity and spatial resolution in stable isotope analysis.»

Isotope analysis of nitrogen and carbon in her hair reveal a diet likely comprising maize and seafood, which, along with other evidence suggest South American origin and a life spent in coastal Peru or Chile.

Isotope analysis of bone and tooth material from King Richard III has revealed previously unknown details of his early life and the change in his diet when he became King two years and two months before he was killed at the Battle of Bosworth.

«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.

Findings from the Sample Analysis at Mars (SAM) instruments suggest that loss of a fraction of the atmosphere, resulting from a physical process favoring retention of heavier isotopes of certain elements, has been a significant factor in the evolution of the planet.

It is not yet technically possible to determine whether an extinct animal chewed the cud from stable isotope analysis, although this approach may someday prove to be useful in determining whether a particular fossil indicates a ruminant digestion.

Factors associated with calcium absorption in postmenopausal women: a post hoc analysis of dual - isotope studies.

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

«It is based on a sophisticated statistical analysis of the isotope composition of sediment in old French wines.

-- isotope and physical analysis of rings in corals, trees and cave.

-- isotope and physical analysis of layers in lakes especially those with varves (annual layers) and in arid areas.

Via various isotope analyses and flow models, Jasechko (2017) estimated that between 42 - 85 % of all groundwater stored in the upper 1 kilometer of the earth's crust is water that had infiltrated the ground more than 11,000 years ago, during last Ice Age.

Statistical analysis of the carbon and oxygen stable isotope recordsr eveals variations in the periods around 100, 11 and 3 years.A century scale connection between the 13C / 12C record and solar activity is most evident.»