Sentences with phrase «oxygen concentrations found»

Because carotid cells produce so much dopamine — up to 45 times more than the fetal neurons — and because they thrive in the relatively low oxygen concentrations found in the brain, he explains, they may do a better job at correcting Parkinson's symptoms than the fetal cells do — and they raise fewer ethical questions.

Not exact matches

A study published in Geophysical Research Letters in 2011 found widespread declines in oxygen concentration in the upper ocean between the 1970s and the 1990s.

In test tube experiments, the researchers found that their haemoglobin - coated particles picked up oxygen when there was a lot around and released it later when the concentration was lower.

By watching a capsule pass through the gut with an ultrasound, the researchers found that oxygen concentrations varied in different regions of the gut, for example between the stomach and the small intestine.

One possible explanation the researchers found for the continued decline of oxygen concentrations is related to changes in water temperature.

Analyzing sensor data and field measurements, Cohen and his students have found new clues for the algal abundance, such as declining concentrations of dissolved oxygen and the role of snails in keeping springs clear.

If found in rocks having experienced a diagenetic history, these structures could help identify the presence of low oxygen concentrations in ancient iron - rich environments.

While the findings focused on the effects of mouth breathing on kids (and how it can even change the shape of their faces), mouth breathing can also cause poor oxygen concentrations.

At the trace levels normally found in biological systems (plants and animals), selenium apparently acts as an antimutagenic, oxygen - radical scavenger, but at higher concentrations selenium is capable of inducing mutations (cancer).»

We find that the global methane hydrate inventory decreases by approximately 70 % (35 %) under four times (twice) the atmospheric CO2 concentration and is accompanied by significant global oxygen depletion on a timescale of thousands of years.

But the boiling point of heavy water, as well as heavy oxygen water (H2O ^ 18 rather than H2O ^ 16) are higher than that of normal water, and are found in water vapor in the atmosphere at lower concentrations when the global temperature is low.

In fact, declining oxygen concentrations in the ocean's interior are currently found to be a near - ubiquitous phenomenon for which the term ocean deoxygenation has been proposed.