Sentences with phrase «isotope tracers»

Schmidt, G.A., 1999: Forward modeling of carbonate proxy data from planktonic foraminifera using oxygen isotope tracers in a global ocean model.

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).

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

Diveena Danabalan said: «We identified neon isotope tracers which show a strong association between helium and groundwater.

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.

Not exact matches

So in 1991 and 1992 his team sprayed plots of red pine and oak in the Harvard Forest with water doped with nitrogen - 15, a tracer isotope.

They also found that the strontium isotope ratio is a sensitive tracer for selenium contamination, one of the major pollutants of mountaintop mining.

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.

Then the scientists calculated the amount of gas dissolved over the millennia, using the helium - 3 isotope as a tracer.

The prevalences and isotope ratios of the noble, or inert, gases, such as neon, argon, krypton and xenon, provide a valuable tracer of ancient processes, because they are chemically nonreactive and so do not change much over time.

«When we got the first inkling that our new mechanism might be useful for developing radioactive tracers, we started looking at Berkeley Lab and its Biomedical Isotope Facility, which was really central to this work,» Levin said.

Measurement of stable isotope incorporation into targeted metabolites (assays above) downstream of a chosen tracer metabolite.

The boron isotope composition of foraminifera provides a powerful tracer for CO2 change over geological time.

Studies utilizing stable isotope labelled tracers have also given an insight into the alterations in VLDL - kinetics which occur in response to acute ER.

And I have repeatedly pointed out that you guys consistently mistake unverified models for reality, and don't know anything worth mentioning about Linear Systems theory, tracer measurements, or why the sink rate for each carbon isotope (in CO2) is the same as each of the others and the same as all of them put together.

You are once again confusing (a) the time required for individual molecules of CO2 (including a particular isotope release / tracer experiment) to swap in the carbon cycle, with (b) the time required for a total concentration change.

The GISS ModelE supports a tracer capability where the global dispersion of local pollution or chemical isotopes can be studied in detail.