Sentences with phrase «by isotope analysis»

So claiming that the CO2 in the air is not due to mankind by isotope analysis is just plain wrong.

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.

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

Not exact matches

A recent analysis of chondrites by Carnegie's Myriam Telus was concerned with iron - 60, a short - lived radioactive isotope that decays into nickel - 60.

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.

By September, Bohr and Wheeler had produced a thorough theoretical analysis, explaining the physics underlying the fission process and identifying which isotope of uranium fissioned most readily.

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.

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.

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.

A Late Maastrichtian age estimate for the unit has been supported by both stable strontium isotope analyses [12] and ammonite biostratigraphy [13].

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.

The study by Louie Yang (Dept. Entomology at UC - Davis) used stable hydrogen isotope analysis to test tissue samples from 114 butterflies at 4 overwintering locations.

Budd, P., Millard, A., Chenery, C., Lucy, S. & Roberts, C. Investigating population movement by stable isotope analysis: a report from Britain.

This model supports a sophisticated analysis of what we can easily measure: concentrations of a drug / metabolite in plasma, which can be augmented by radio - isotope measurements and so on, that would not be possible if the measurements were considered in isolation.

Gerald Bond found evidence of cosmogenic isotope changes at each of a long series of warming followed by cooling events (he has able to track 25 events through current interglacial Holocene and into the last glacial period, at which point he reached the limit of the range of the proxy analysis technique) which indicates a solar magnetic cycle change caused the warming followed by cooling cycle.

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.

c) Average sunspot number prediction by a low - frequency modulation model (dotted curve) based on frequency analysis from sunspot and cosmogenic isotope records, compared to the average sunspot number since 1750 (continuous curve).

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.

In the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitch.