Sentences with phrase «oxygen concentrations»

Areas with a lot of trees have a higher oxygen concentration in the environment, and therefore it's easier to breathe and relax.

At the same time, the increase in temperature, reduced oxygen concentration and adjustment of the tidal cycle produced no significant effect.

Their iron content also promotes immunity by raising oxygen concentration in the blood.

For each degree of ocean warming, oxygen concentration goes down by 2 percent.

A commonly held belief that global warming will diminish oxygen concentrations in the ocean looks like it may not be entirely true.

They proved that the absolute oxygen concentration around blood stem cells was indeed low, despite a very large density of the blood vessels.

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.

A lowlander exposed to the low oxygen concentrations of high elevations can quickly fall victim to altitude sickness, whose symptoms include nausea, dizziness, and fatigue.

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.

The amount of trace elements in ocean pyrite correspond to ocean oxygen concentrations at different points in geologic time.

By tunneling through the sea floor, scientists say, these creatures kept oxygen concentrations at just the right level to allow animals and other complex life to evolve.

Princeton University researchers have compiled 30 years of data to construct the first ice core - based record of atmospheric oxygen concentrations spanning the past 800,000 years, according to a paper in the journal Science.

The normal job of the carotid body, nestled in the carotid artery, is to signal your brain to step up your breathing if your blood oxygen concentrations drop too low.

Oxygen sensors do not measure oxygen concentration, they work by switching from high to low voltage at the stoichiometric point.

Since then, numerous short lived biotic events — typically marked by significant climatic perturbations — took place when oxygen concentrations in the ocean dipped episodically.

Stolper and his co-authors suggest that the extra carbon dioxide emitted due to declining oxygen concentrations in the atmosphere stimulated silicate weathering, which stabilized carbon dioxide but allowed oxygen to continue to decline.

Researchers have produced the strongest evidence yet that mitochondria — the organelles that generate energy to power the cell — also monitor oxygen concentration in the cell.

Since 1957, environmental parameters such as oxygen concentrations, temperature, salinity and nutrients have been measured monthly at the Boknis Eck time series station.

The team presents new isotopic data showing that a burst of oxygen production by photosynthetic cyanobacteria temporarily increased oxygen concentrations in Earth's atmosphere.

Parameters often monitored include oxygen concentration in the blood stream (pulse oximetry), electrocardiogram (EKG), core body temperature, respiratory rate, heart rate, blood pressure and carbon dioxide level.

However, a new picture is emerging: Oxygen production by photosynthetic cyanobacteria may have initiated as early as 3 billion years ago, with oxygen concentrations in the atmosphere potentially rising and falling episodically over many hundreds of millions of years, reflecting the balance between its varying photosynthetic production and its consumption through reaction with reduced compounds such as hydrogen gas.

Because oxygen is critical to many forms of life and geochemical processes, numerous models and indirect proxies for the oxygen content in the atmosphere have been developed over the years, but there was no consensus on whether oxygen concentrations were rising, falling or flat during the past million years (and before fossil fuel burning).

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.

In each interval, they compared the largest wing length, which presumably belonged to the largest insect that lived during that particular period, to the average oxygen concentration in Earth's atmosphere during that time.

By tunneling through the sea floor, these creatures altered our planet's chemistry and kept oxygen concentrations at just the right level to allow animals and other complex life to evolve.

Frogs and other amphibians gauge ambient oxygen concentrations through their skin, but nobody had ever checked to see if mammals had the same ability.

«Since oxygen concentrations in the ocean naturally vary depending on variations in winds and temperature at the surface, it's been challenging to attribute any deoxygenation to climate change.

This technique provides a measure of blood oxygen concentration in surface blood vessels, indicative of activity in the brain's outer layers, using a set of wearable probes in a cap that is placed on the head.

This includes places like parts of the eastern Pacific Ocean where small animals like nematodes and specially adapted fish live on the fringes of habitability, subsisting in waters where oxygen concentrations can be only about 1 % of normal surface water levels.

Examining the distribution patterns of microfossils, Shen's Harvard colleagues have discovered that the marine eukaryotic algae of 1.5 billion years ago occupied only the ocean shallows and not the deeper basins, indicating a smaller oxygen concentration in the atmosphere than exists today.

Near - freezing water, lack of sunlight, and low oxygen concentrations discourage the growth of bacteria and other organisms that can break down debris.

Chan studies ocean oxygen concentrations off the coast of Oregon.

They charted how fluctuating oxygen concentrations correlated with the emergence of new animals as seen in the fossil record and from genetic data.

«Less optimal tumor control outcomes among smokers could possibly be explained by the influence of less oxygen concentration within the treated tumors among smokers, which is known to lead to less sensitivity of the cells being killed off by radiation treatments,» Dr. Zelefsky noted.

The team found that higher oxygen concentrations slow down the cross-linking of chemicals in the hydrogel, inhibiting growth in that specific area.

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.

Despite extensive measures to protect the Baltic Sea from anthropogenic activities since the late 1980s, oxygen concentrations continue to decrease.

UC Riverside research team challenges conventional view of a simple two - step rise in early oxygen on Earth; study suggests instead dynamic oxygen concentrations that rose and fell over billions of years.

Lyons notes that the factors controlling the rise of animals are under close scrutiny, including challenges to the long - held view that a major rise in atmospheric oxygen concentrations triggered the event.

The information about oxygen concentration comes from the isotopic composition of carbon or rather from the ratio between the stable carbon isotopes 12C and 13C.

Researchers have discovered the molecular mechanisms by which the roundworm C. elegans senses oxygen concentrations in the highly variable soil environment where it lives.

Working with microscopist Charles Lin from the Wellman Center for Photomedicine at Massachusetts General Hospital and stem cell biologist David Scadden from the Harvard Stem Cell Institute, the investigators measured local oxygen concentration in the bone marrow of live mice.

Now, using the Vinogradov lab's method, the team made the first direct measurement of fine oxygen concentration gradients in live bone marrow.

To achieve their protective effects, Yu and Wei are using oxygen concentrations of 0.5 %.

The central mediator during hypoxia is HIF (hypoxia inducible factor); a transcription factor that directly regulates genes necessary to overcome and / or resolve the negative effects of insufficient oxygen concentrations.

Oxygen concentration during mouse oocyte in vitro maturation affects embryo and fetal development.

The variation in crenarchaeal ammonia monooxygenase related subunits with water depth is also of ecological interest, given the potential differences in dissolved oxygen concentrations between surface and benthic waters or between planktonic and symbiotic environments.