Sentences with phrase «carbon isotope analysis»

Polar bears make little use of terrestrial food webs: Evidence from stable - carbon isotope analysis

Change of diet of the Greenland Vikings determined from stable carbon isotope analysis and 14C dating of their bones.

Tree ring and carbon isotope analysis of a sample of trees on the study sites would give measurable data for evaluating this question, which would be a good field study to follow this modeling exercise.

Jack, «Using carbon isotope analysis the 40 % increase in atmospheric CO2 over the past 2.5 centuries can be linked directly to the burning of fossil fuels.»

Using carbon isotope analysis the 40 % increase in atmospheric CO2 over the past 2.5 centuries can be linked directly to the burning of fossil fuels.

Angst et al. conducted carbon isotope analysis on fossils of Gastornis and several contemporaneous herbivorous mammals across several European sites and compared these to isotope profiles from extant birds with known diets.

«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.

Based on carbon isotope analyses the methane is of biogenic origin.

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.

Scientists can determine where an individual piece of meat comes from using a technique called isotope analysis, looking at the specific fingerprints of carbon, hydrogen, and nitrogen atoms to see where a cow lived.

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

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.

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.

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.

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.

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

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.

To date, we have a full complement of analyses for about three years of growth for one tusk from the Taimir Peninsula of Siberia (the Jarkov mammoth; ca. 20,300 rybp) and growth increment and tusk apatite carbon and oxygen isotope ratios for two to three years of growth from two tusks from Wrangel Island (4,400 and 4,120 year bp).

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.

Stable carbon isotope ratio analyses on trace methane from ice samples.

We compare two methods of isolating bone collagen for stable carbon and nitrogen isotope analysis.

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

Because carbon cycle processes such as photosynthesis fractionate the heavy isotope 13C from the lighter 12C, isotopic analysis can usually be used to «trace» sources and sinks of carbon.

To date, we have a full complement of analyses for about three years of growth for one tusk from the Taimir Peninsula of Siberia (the Jarkov mammoth; ca. 20,300 rybp) and growth increment and tusk apatite carbon and oxygen isotope ratios for two to three years of growth from two tusks from Wrangel Island (4,400 and 4,120 year bp).

I always think of it as anthropogenic CO2 is «old» carbon with «young» oxygen, the old and young part being determined by isotope analysis similar to carbon dating.

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.»

Some researchers have correlated climatic variation from tree ring analyses (Garfinkel and Brubaker [1980]; Briffa et al. [1990]; Villalba [1990]-RRB- and from the analysis of variations in the stable isotopes of carbon (Panek and Waring [1997]-RRB-.

The results of the study are based on the analysis of the variation of carbon isotopes in the annual growth rings of trees.

Furthermore, we found no relationship between δ13C and δ18O (linear mixed effect model, coefficient = − 0.012, df = 82, p = 0.925) when we structured the analysis by individual, a result that might have indicated metabolic effects on carbon and oxygen isotopes (e.g. [23]-RRB-.

Analysis of carbon isotopes in seabed samples from 14 offshore sites indicated that about 13 % of the carbon released by permafrost erosion ends up sequestered in nearshore sediments.

Carbon comes in different isotopes, two of which are most important for climate analysis: carbon with 7 neutrons (13C), and carbon with 6 neutrons (12C).

Isotope analysis allows us to identify that this CO2 is the result of «old» carbon combining with «new» oxygen which is a clear signature of fossil fuel combustion produced CO2.