Sentences with phrase «use isotopic»

Researchers use the isotopic signature of methane to figure out its source.

From what I can tell you really can not use isotopic data to determine this accurately at all.

Researchers also may be able to extract DNA from his exceptionally well preserved teeth or use isotopic chemical analysis to discover what he ate.

By using isotopic tracers called stable isotopes, researchers showed that seabirds feeding in areas rich in sulfate (a chemical that is an important food for sulfate - reducing bacteria that help break down organic matter) had high levels of mercury.

This temperature curve, established using an isotopic thermometer, is widely applied for reconstruction of past environmental conditions and in this case, is based on the isotopic composition of the oxygen contained in the fossilised remains of fossil marine fish (bone, teeth, scales).

Can clastic sedimentary rocks be directly dated using isotopic dating?

I questioned the abiliy to prove that conclusion using isotopic data.

Last year Dr Nisbet's team used isotopic analysis and weather models to trace a cloud of methane over the North Sea not to one of its many oil rigs but to cows in the county of Lincolnshire.

Using isotopic and chemical tracers, the researchers estimate that the CO2 had been mineralized into benign and stable carbonate minerals in the space of just two years.

«ENSO and IOD bring... shift [s] in the seasonal rainfall distribution,» Ghosh said, «which can be easily captured using isotopic fingerprinting of carbonates in growth bands of Achatina fulica snails.»

Not exact matches

So because there isn't a single reliable Radioactive Isotopic Dating Method (and dismissing that using many methods together is what we do), you have determined that the earth is 10,000 years old or less.

«Essentially, we found that these elements have unique isotopic fingerprints, meaning we can use them as diagnostic tools to quantify mountaintop mining's relative contribution to contamination in a watershed,» said Avner Vengosh, professor of geochemistry and water quality at Duke's Nicholas School of the Environment.

This research, which you can read in the journal Geology, paves the way for new uses of isotopic methods in exploration geology.

They also used satellite precipitation data to «backsolve» the brine's origins using sodium concentrations, oxygen and hydrogen isotopes, as the isotopic composition of water reflects the condensation temperature and precipitation rate over time.

A team led by Charles R. Carrigan at Lawrence Livermore National Laboratory (LLNL) used field experiments to build a new, complex model that predicts isotopic ratios of noble gases that would be released from such explosions (Sci.

The Temagami Banded Iron Formation, which was formed 2.7 billion years ago during the Neoarchean period, can be used as an archive because the isotopic composition of many chemical elements such as Hafnium and Neodymium directly mirrors the composition of Neoarchean seawater.

Rather than excavate, the team intends to use the Swedish Research Council's largest ever archaeo logical grant to reexamine spectacular existing finds using modern methods such as isotopic analysis.

To test this hypothesis, the possible contribution of marine fish in the diet of these carnivores was evaluated using carbon, nitrogen and sulphur isotopes in faunal bone collagen, comparing these isotopic signatures between predators and their potential prey.

Their hydrogen isotopic composition can be used as an indicator of past precipitation intensity.

Using core samples of the seabed in three locations, the scientists measured the isotopic ratio of nitrogen - 15 to nitrogen - 14 in the organic matter therein; the ratio can be used to estimate the extent of anoxia in these OMZs.

After ScienceInsider revealed last week that scientists were condemning its use of DNA testing and isotopic tissue analysis to decide the fate of asylum seekers, the U.K. Border Agency has apparently changed its plans.

The mechanism is revealed by the isotopic labeling experiments and the stoichiometric reactions by use the 1,3 - butadiene complex of ruthenium.

Today, researchers are able to extract vast amounts of information using current methods — such as precise digital measurement and categorization of the bones, examination of the conditions in which the bone fragments were preserved, as well as isotopic and genetic analysis.

Using chemical, biological, optical, and isotopic measurements, researchers from Québec, Denmark, Finland, and Sweden have analyzed hundreds of samples from 14 circumpolar regions spanning from Alaska to Russia (from the subarctic zone to the High Arctic).

I joined the team and undertook isotopic work using oxygen, nitrogen and carbon stable isotopes to assess his geographical origin and also his diet.

Bell L.S., Lee - Thorp J.A. & Dobney K. (2006) Mapping human movement using stable oxygen isotopic mass spectrometry: potential application to forensic science.

The hockey stick - shape temperature plot that shows modern climate considerably warmer than past climate has been verified by many scientists using different methodologies (PCA, CPS, EIV, isotopic analysis, & direct T measurements).

Using innovative isotopic analysis techniques and mathematical modeling, he has shown that Mars is a planetary embryo, found isotopic similarities between the Moon, Earth and meteorites, and proposed a new narrative for the origin of Earth's unique iron composition.

Interests: Multi-disciplinary research on ocean and terrestrial carbon cycle processes using a variety of geochemical and isotopic techniques.

His discoveries of isotopic heterogeneity at the nanoscale during that exercise gave rise to his interest in developing new forensic tools for nuclear fuel pellets using NanoSIMS.

Using a laser technique which removes negligibly small amounts of dental enamel, and analyzing trace amounts of isotopic Strontium, they found individuals with small teeth roamed more widely from their birthplace than did individuals with large teeth.

«Using more sophisticated physics and powerful super-computers, we managed to remove the systematic biases that plague traditional modeling and have previously led to false identifications of the 6Li / 7Li isotopic signature.»

To help CEA - Leti and Inac leverage nuclear spin free silicon in the CMOS platform, a silicon precursor was supplied by Air Liquide, using an isotopically purified silane of very high isotopic purity with a 29Si isotope content of less than 0.00250 percent, prepared by the Institute of Chemistry of High - Purity Substances at the Russian Academy of Sciences.

Mortimer et al. (2017b) discuss new Ar / Ar and limited U — Pb ages and geochemistry (both trace element and Nd isotopic analyses) of widespread volcanism on the northern part of the Zealandia continent by using dredged samples obtained in different cruises and integrated with their earlier findings on the southern Zealandia in an attempt to give a more updated picture of magmatism across the whole Zealandia continent.

Conservative tracer studies using stable oxygen isotopic data from 307 sites show that while the entire surface of this area receives abundant freshwater from meteoric sources, freshwater from sea ice melt is most closely linked to the areas of carbonate mineral undersaturation.

Assessing the anthropogenic influence on atmospheric oxidants using the oxygen isotopic composition of sulfate and nitrate from the WAIS - Divide ice core.

Isotopic composition can therefore be used as a proxy for historical air temperatures before the period for which we have instrumental measurements.

Sm - Nd isotopic dating of Proterozoic clay material: An example from the Francevillian sedimentary series, Gabon Lesson Plan Tool - Educators can use the UEN Lesson Plan Tool to create their own lessonplans online.

Isotopic analysis is used in a variety of fields across the sciences, such as Geology, Biology, Organic Chemistry, and Ecology.

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.

(Isotopic analysis of the oxygen in tooth enamel has also been used to study climate swings, including the onset of the Little Ice Age).

To those that still question Mike's research, know this: since the first hockey stick paper of 1998, there have been more than a dozen studies published by many scientists using different methodologies (PCA, CPS, EIV, isotopic analysis, & direct T measurements) that duplicate the hockey stick.

Overall budgetary considerations are currently more quantitavely restrictive, but the isotopic data can be used to rule out other «unidentified» sources.

Isotopic signatures can be used to date past events of methane release, as well as their duration.

We thus only used limpets for a relative trend in isotopic signature and only assigned the most recent growth strata to a particular year.

Confident paleothermometry is provided by site - specific calibrations using ice - isotopic ratios, borehole temperatures, and gas - isotopic ratios.

Related Volcanoes, Tree Rings, and Climate Models: This is how science works Fossil Focus: Using Plant Fossils to Understand Past Climates and Environments Atmospheric oxygen over Phanerozoic time Coupled carbon isotopic and sedimentological records from the Permian system of eastern Australia reveal the response of atmospheric carbon dioxide to glacial growth and decay during the late Palaeozoic Ice Age

Don: On your last points about dating the carbon dioxide and ice there are two papers that cast doubt on the use of isotopic oxygen and carbon for this purpose.

The method used to determine the isotopic ratios in ice core gases is by sublimating all ice under vacuum over a cryogenic trap and subsequent sublimating all ingredients step by step.

The crux of her current research focuses on the use of molecular fossils («biomarkers») and their isotopic composition to decipher mechanisms of (mass) extinctions, ecosystem response, and ecologic resilience during intervals of abrupt climate change.