Sentences with phrase «as a tracer»

Iron can fuel plankton blooms and influence how the ocean responds to climate change, while the lead images show the impact of past pollution on the ocean and continuing contamination in some parts of the world and aluminium is used as a tracer of desert dust inputs to the ocean.

The research team tracked methane concentrations along with radon and radium, naturally occurring elements that serve as tracers for groundwater.

Because the galaxies we use as tracers of the Hubble expansion will disappear.

At Toolik Lake, Paytan and her colleagues tracked methane concentrations concurrently with two naturally occurring elements (radon and radium) that serve as tracers for groundwater.

Deeper redshift surveys combined with similar weak lensing maps should reveal an even greater contribution of star - forming galaxies as tracers of the matter distribution in this higher redshift range.

Starting in the mid-1990s, scientists began using GFP as a tracer for studying biochemical processes.

«Halogens like chlorine or bromine are added to the water as a tracer for the movement of soil - water.

The most common PET scan uses fluorodeoxyglucose (FDG) as the tracer in order to show how glucose concentrations change in tissue over time — a proxy for metabolic activity.

Using a small amount of a radioactive substance as a tracer, the scientists focused on the brain's mu - opioid system in which chemicals called endogenous opioids bind to receptors and hinder the spread of pain messages in the brain.

By tracking the positrons emitted as the tracer breaks down, the machine can capture images of biological processes.

The cloning was the first step in using GFP as a tracer chemical in organisms other than jellyfish.

«Using oxygen as a tracer of galactic evolution.»

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

Using ethane as a tracer for fugitive methane emissions, his team found two high - emitting sites in the central United States.

Briceño has found that sucralose can potentially be used not just as a tracer — which flags a potential problem — but also as an indicator, which means it can help to determine the extent of the problem.

It's still unclear what, if any, the larger benefits could be from using sucralose as a tracer or indicator.

Chakravarti further notes that because GBM cells take up methionine much faster than normal glioma cells, positron emission tomography that uses methionine as a tracer (MET - PET) might help map GBM tumors more accurately, allowing more precise surgical removal and radiation - therapy planning.

Such isolated black holes would be too dim to discern at the galactic core, but the x-ray binaries serve as a tracer suggesting they're there — and in really big numbers.

CMIIT will provide researchers with needed education and training on the «nuts and bolts» of translating and transitioning an agent or technique from pre-clinical research into the clinical practice such as tracer development, equipment, and funding.

That's what's exciting about finding fullerenes as a tracer,» Becker said.

As the tracer moves through the body, it will accumulate in certain organs.

Using ozone as a tracer, it develops a new rationale for climate modeling.

I - 129 does have significant value as a tracer of movement of fission products through the environment and the biosphere, since any of it you find was created in the last 60 years and the quantity is essentially unchanged in that time.

Ruddiman and McIntyre (1981); Boyle and Keigwin (1982)(using Cd as tracer for nutrients); for further refs., see Broecker et al. (1985); later Boyle and Keigwin, using a core from a spot where deposits had built up exceptionally fast, found that «the deep ocean can undergo dramatic changes in its circulation regime» within 500 years, Boyle and Keigwin (1987), p. 36.

To evaluate this hypothesis, Dasgupta suggests the use of several trace heavy metals whose concentrations also rise during firework displays as tracers.

Weak lensing is a phenomenon that provides a powerful technique for mapping the changing contribution of star - forming galaxies as tracers of the cosmic web.

These radioactive compounds act as a tracer and naturally emit subatomic particles called positrons over time, and the gamma rays indirectly produced by this process can be detected by imaging equipment.

The technique uses magnetically labeled blood water as a tracer to quantify brain blood flow.

Bowern counters that the «instability» of words can actually be a boon, serving as a tracer for how languages change over time.

«It turns out that the contribution of star - forming galaxies as tracers of the mass distribution in the distant universe is not negligible,» said Dr. Utsumi.

It is also possible to use the way the gravity of clusters of galaxies distort more distant background galaxies, weak gravitational lensing, as another tracer.

PET scans which use fluorodeoxyglucose (FDG) as a tracer can be used for neuronal loss, and are useful when a reliable short - term prediction of cognitive decline is needed.

The research team used a stable isotope of nitrogen, N - 15, as a tracer to track fertilizer nitrogen applied in 1982 to sugar beet and winter wheat crops on a pair of two - metre - square plots at a site in France.

One study found that these compounds could affect aquatic ecosystems by interfering with photosynthesis or sugar transport in plants, for example; it also found that the by - products of acesulfame, another artificial sweetener that has also been used as a tracer but may be less stable in the environment, may have greater ecosystem impacts.

A major area of research over the past several years has been the use of natural radon - 222 as a tracer of groundwater flow into coastal and lake waters.

The first step in these trials would look at the distribution and potential toxicity of the radioactive manganese chloride used as a tracer.

Koch, D., and D. Rind, 1998: Beryllium 10 / beryllium 7 as a tracer of stratospheric transport.

[1,2 - 3H (N)-RSB-- Hydrocortisone (PerkinElmer NET396250UC) was used as a tracer.