Sentences with phrase «stable isotope»

Use of Stable Isotopes of Carbon, Nitrogen, and Sulfur to Identify Sources of Nitrogen in Surface Waters in the Lower Susquehanna River Basin, Pennsylvania We know that isotopes are atoms with the same number of protons and different numbers of neutrons.

Early TRL projects focused on establishing long tree - ring records from temperature - sensitive boreal forest locations in North American for studies of global change, using dendrochronologically dated wood, to investigate the value of stable isotope ratios in cellulose as paleo - thermometers and developing the necessary computer software for processing the data.

[7] Recent evidence from stable isotope analysis of Holocene fur seal bone collagen (δ13C and δ15N) indicates that before the maritime fur trade, it was more common for these animals to breed at local rookeries in British Columbia, California, and likely along much of the northwest coast of North America.

No, some other animal probably converted the grass into meat on the hoof, and the hominids got the characteristic carbon stable isotope ratio from eating the grazing animal — they ate grass indirectly, at one remove.

Finally, we have developed new techniques utilizing surface sensing of translation (SUnSET) and bioorthogonal noncanonical amino acid tagging (BONCAT) coupled with stable isotope labeling by amino acid in cell culture (SILAC) to selectively isolate and quantify newly synthesized proteins within specific temporal windows.

In South - East females, δ13C values were lower in autumn compared to spring and females seemed less selective in their diet as depicted by large variances in stable isotope values.

They are also combining NMR / CLSM with stable isotope probing methods for the functional analysis of intact natural (mixed - species) biofilms.

The main strength of this study was the extremely careful direct measurement of variables like glycogen stores (using invasive muscle biopsies) and fat metabolism (using stable isotope tracers).

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

As applied to the Initiative, the enhanced sensitivity of the laser ablation measurement approach will be harnessed for measuring stable isotope content of nanogram amounts of RNA samples.

This method, which uses an ultraviolet laser developed as part of PNNL's Microbial Communities Initiative, permits spatially resolved carbon stable isotope measurements versus standard methods that produce average, bulk - type measurements.

Identifying low pH active and lactate - utilizing taxa within oral microbiome communities from healthy children using stable isotope probing techniques.

``... carbon and oxygen stable isotope records reveal variations in the periods around 100, 11 and 3 years.

The researchers looked at the nitrogen stable isotope composition of different members of the food web at suburban ponds.

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.

They're going to help modify the uranium centrifuges to produce stable isotopes for industry.

Otolith O and C Stable Isotope Compositions of Southern Bluefin Tuna Thunnus maccoyii (Pisces: Scombridae) as Possible Environmental and Physiological Indicators.

In recent years, ecologists have increasingly relied on stable isotope ratios to define and quantify part of an organism's niche.

Additionally, we found that changes in the water stable isotope signatures in the ice at DF tended to occur before the same changes at EDC, with the time between changes being more pronounced during cold periods.

The food web supporting the fishes on deep reefs was studied using advanced stable isotope methods, which revealed small but important differences in the ecology of fish living on deep and shallow reefs.

The MBL Stable Isotope Laboratory is located at The Ecosystems Center on the campus of the Marine Biological Laboratory in Woods Hole, Massachusetts.

James wrote: «Of course there are no actual stable isotopes of anything, just ones with very much greater half - lives.»

Variations in tree ring stable isotope records from northern Finland and their possible connection to solar activity; Ogurtsov et al, 2010, see abstract here.

J. You / Science; Data: «Climatic signals in multiple highly resolved stable isotope records from Greenland,» Vinther et al, 3 November 2009; «Norse Greenland settlement,» Dugmore et al., 2007; «Human diet and subsistence patterns in Norse Greenland AD c. 980 — AD c. 1450,» Arneborg et al. 2012

The team went on to show that supplementing heavy stable isotope - labeled forms of these precursors led to incorporation of heavy amino acids into proteins produced in enzyme expressing cells.

A high resolution stable isotope record from central West Antarctica covering the last 62,000 years.

Stable isotopes show minimal differences between modern and ancient gray whale foraging ecology.

Since then, radiation levels have ebbed as short - lived radionuclides, such as iodine - 131 with a half - life of 8 days, decay into stable isotopes.

Each element also has a naturally occurring stable isotope containing an extra neutron, termed C13 and deuterium, respectively.

Using osteobiography and paleopathology methods as well as stable isotope analysis and mass spectrometry on about 500 skeletons from the dairy - farming area, they have been able to reconstruct the group's diet, disease and overall health.

After it is extracted from the ground, however, lead - 210 decays into more stable isotopes, with the concentration of the radioactive isotope halving every 22 years.

Environmental influences on the recruitment process inferred from otolith stable isotopes in Merluccius merluccius off the Balearic Islands.

Major research instrumentation and facilities include well - equipped research computing laboratories, 40Ar / 39Ar, quadrupole, and stable isotope mass spectrometers, electron microprobe, high - pressure rock physics and rock mechanics laboratory, fission track and image analysis lab, neutron activation counting lab, liquid and gas chromatography lab, a flow visualization lab, and local seismic networks.

A comparison of ancient DNA (single - nucleotide polymorphisms) and carbon and nitrogen stable isotope evidence suggests that stored cod provisions recovered from the wreck of the Tudor warship Mary Rose, which sank in the Solent, southern England, in 1545, had been caught in northern and transatlantic waters such as the northern North Sea and the fishing grounds of Iceland and Newfoundland.

Hydrological and Climatological Changes in the Trondheimsfjord / Norway during the late Holocene inferred from Benthic Stable Isotopes and Dinocyst Assemblages G. Milzer, J. Giraudeau, S. Schmidt, J. Faust, J. Knies, F. Eynaud, C. Rühlemann > Download

S1; Table S1): alkenone (n = 31), planktonic foraminifera Mg / Ca 24 (n = 19), TEX86 (n = 4), fossil chironomid transfer function (n = 4), fossil pollenmodern analog 25 technique (MAT)(n = 4), ice - core stable isotopes (n = 5), other microfossil assemblages (MAT and 26 Transfer Function)(n = 5), and Methylation index of Branched Tetraethers (MBT)(n = 1).

Measurements of fetal levels of maternally infused stable isotope - labeled myo - inositol in normal pregnancies at term demonstrated that less than 10 % of fetal inositol was maternally derived, suggesting little placental transport in late pregnancy (19)»

[2] The oxygen isotope composition refers to the relative abundance of oxygen's two main stable isotopes, oxygen - 16 (16O) and oxygen - 18 (18O).

The scientists also examined stable isotopes of the collagen, a structural protein, which forms an essential part of the bones.

Besides resolving the issue of what black bears and Norway rats actually use for growth and function, the scientists said a major goal of their study was to demonstrate how the use of stable isotopes derived from animal tissues and their prey could be used to quantify the resource use of other omnivores with complex diets.

Unlike radioactive isotopes, stable isotopes do not decay, and they occur naturally in the body in low amounts.

All plants use carbon dioxide from the air to make sugars, but maize ends up with a different balance between carbon - 12 and the rarer stable isotope, carbon - 13, compared with most other plants.