Sentences with phrase «by stable isotope»

Investigation of the microbial metabolism of carbon dioxide and hydrogen in the kangaroo foregut by stable isotope probing

Digestibility of Cooked and Raw Egg Protein in Humans as Assessed by Stable Isotope Techniques.

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

Not exact matches

Knowing that uranium and thorium decay into two lead «isotopes» — which can be distinguished by their different physical properties — Soddy later measured the atomic weights of this stable element in ores rich in uranium and thorium, and found that they were 206.08 and 207.69, respectively.

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.

By carefully micro-sampling each shell along its direction of growth and analyzing for stable carbon and oxygen isotopes and trace elements, the team reconstructed a record of seasonal variation during the lifetimes of the organisms.

«First we have contributed by labeling studies using stable isotopes to investigate the metabolic pathways for latex production,» says Professor Wolfgang Eisenreich, biochemist at TU München.

To test if the trees profit from the presence of bats by incorporating nutrients from bat excreta into their seeds, the researchers analysed a specific form of nitrogen, the stable isotope 15N.

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.

The team found that the degree of nitrogen pollution, which is worsening in urban areas, can be evaluated by analyzing the nitrogen content and the stable isotope ratio in bryophytes.

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.

Shankaran, M.; King, C.; Lee, J.; Busch, R.; Wolff, M.; Hellerstein, M. K. Discovery of novel hippocampal neurogenic agents by using an in vivo stable isotope labeling technique.

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.

In the above citied letter to Nature the authors concluded out of their experiments: «Here we demonstrate using stable carbon isotopes that methane is readily formed in situ in terrestrial plants under oxic conditions by a hitherto unrecognized process.»

Here, we tested the hypothesis that sub-bleaching temperature and excess nitrogen promotes symbiont parasitism by measuring respiration (costs) and the assimilation and translocation of both carbon (energy) and nitrogen (growth; both benefits) within Orbicella faveolata hosting one of two Symbiodiniumphylotypes using a dual stable isotope tracer incubation at ambient (26 °C) and sub-bleaching (31 °C) temperatures under elevated nitrate.

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.

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.

The unstable nucleus of this radioactive isotope loses energy by emitting ionizing particles for reaching a stable state.

Use of stable isotope tracers would also be of particular value as they would allow for in vivo assessments of post-treatment alterations various aspects of hepatic metabolism including glucose metabolism, fat oxidation and VLDL - kinetics which have been shown to be altered by acute periods of ER.101 Increased Stress Resistance

Improved source apportionment of PAHs and Pb by integrating Pb stable isotopes and positive matrix factorization application (PAHs): A historical record DATING DOULTON BURSLEM.

The approach I would start with is to look at the various stable good nuclei, find which isotopes with short half lives decay to that state, and trace back the chain of reactions to see what kind of isotopes we might want to produce by bombarding some other isotopes with neutrons... and maybe some isotope of lead or mercury would do the trick.

The deuterium excess, a proxy of Greenland precipitation moisture source, switches mode within 1 - 3 years over these transitions and initiates a more gradual change (50 years) of the Greenland air temperature as recorded by water stable isotopes.

We studied a high - resolution multiproxy data set, including magnetic susceptibility (MS), CaCO3 content, and stable isotopes (δ18O and δ13C), from the stratigraphic interval covering the uppermost Maastrichtian and the lower Danian, represented by the pelagic limestones of the Scaglia Rossa Formation continuously exposed in the classic sections of the Bottaccione Gorge and the Contessa Highway near Gubbio, Italy.

One of the ways researchers can assess the impacts of climate change is by evaluating shifts in feeding strategies of marine animals, which they are able to do by measuring the stable isotopes present in their bones.

The smaller emissions from polygonal ponds may be due to more activity by the methanotroph community, and we note that stable isotopes were consistent with more CH4 oxidation in polygonal ponds (Fig. 3b).

«The surface temperature changes for the last 4000 years in northern inland Iberia (an area particularly sensitive to climate change) are determined by a high resolution study of carbon stable isotope records of stalagmites from three caves (Kaite, Cueva del Cobre, and Cueva Mayor) separated several 10 s km away in N Spain.

For example, extreme values of the ratio of stable isotopes in foraminifera from the eastern Pacific have previously been interpreted as ENSO activity, but modeling suggests that this interpretation may not always be suitable for past climates due to variability caused by other factors.

The δ18O stable isotope ratio was the first palaeothermometer, proposed by Urey [38] and developed especially by Emiliani [39].

The size of the carbon injection is estimated from changes in the stable carbon isotope ratio 13C / 12C in sediments and from ocean acidification implied by changes in the ocean depth below which carbonate dissolution occurred.

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.

The main panel 1 data is from stable oxygen isotope measurements from the shells of macroscopic marine organisms («fossil shells»), collected by Veizer et al (1999), as re-interpreted by Royer et al (2004).