Sentences with phrase «when oxygen»

When oxygen is prevented from entering the brain partially or completely, brain cells can die which can lead to permanent, life - altering brain injury.

Add the facts in trend: The oceans are acidifying, The climate has already shifted 4 degrees of latitude in the past 30 years; the Arctic will likely be virtually ice free during the summer melt within the decade, all the uncertainty ranges are positive and none of them are negative, CO2 is plant food, but what does that mean when the oxygen levels are dropping, the Hoover dam is supposed to shut down in 2023 due to no water (latitudinal shift), the Yangtze in China is getting very low, etc. etc..

In addition, when the oxygen in seawater is depleted, bacterial respiration of organic matter turns to alternate electron - acceptors with which to oxidize organic matter, such as dissolved nitrate (NO3 ---RRB-.

Nitrogen oxides are formed when oxygen and nitrogen come together at high pressure and temperature found in the internal combustion engine.

This means that when oxygen and / or nitrogen molecules join together to form larger multimer molecules, the average amount of latent energy they can store will decrease.

The critical value that defines hypoxia is 2 mg / L, or ppm, because trawlers can not catch fish or shrimp on the bottom when oxygen falls lower.

«When oxygen reacts with the energized titanium dioxide catalyst, NOx is converted to nitrate and removed from the air.

Since nearly every home also includes pets, many pet lives can be saved when oxygen can be effectively delivered.

Not to worry: when the oxygen rich cool weather comes, the engine will come to life... be aware!

When the oxygen sensors have readings that are similar to each other, it is an indication that the catalytic converter is not working as intended.

When the oxygen supply to the brain is reduced as a result of blood vessel restriction, it is not uncommon for people to experience feelings of cloudiness, leading to anxiety and even depression.

Another ecological focus is the Oxygen Bar that adds pure oxygen to the air in the restaurant (when the oxygen is not in use by the customers).

When oxygen levels in the blood drop, your body responds by releasing stress hormones and partially waking you up ---- as many as 400 times a night.

When the oxygen level of a cell drops below 40 %, an acidic environment that promotes the growth of cancer cells is created.

Dr Otto Warburg received a Nobel Prize in 1932 for demonstrating that cancer occurs when the oxygen levels of cells become too low.

Also important is what happens when oxygen can no longer be delivered to the muscle cells quickly enough to keep up with demand.

Lactic acid is created when oxygen is not present and glucose goes through fermentation instead of the Kreb's cycle.

Oxidation happens when oxygen interacts with cells and it's what makes an apple turn brown, metal rust, or food go rotten.

When an oxygen molecule becomes electrically charged or «radicalized» it tries to steal electrons from other molecules, causing damage to the DNA and other molecules.

Essentially, rust occurs when oxygen comes in contact with the metal.

When an oxygen molecule (O2) becomes electrically charged or «radicalized» it tries to steal electrons from other molecules, causing damage to the cell's DNA.

The observation that the amount of HIF - 1 plummets when cells are shifted to high - oxygen conditions squared with the factor's hallmark ability to activate target genes only when oxygen is limited.

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

However, in the absence of VHL, HIF - 1 is active even when oxygen is plentiful and switches on genes that help a cell take up more glucose.

Their studies showed that both types of uraninite, the chemically synthesized coarse - grained pure uranium oxide and the biogenic form, had similar solubility and comparable dissolution rates when oxygen was present and when it wasn't, consistent with their similar crystal core structures.

«When oxygen gets underneath, it changes the way graphene interacts with the metal,» said Dohnálek.

Results: When oxygen atoms escape, they change the local electronic structure and cause the voltage to fade in a next - generation battery, according to theoreticians at Pacific Northwest National Laboratory and University College London, UK.

Earlier experiments led the team to focus on the oxygen vacancies and the two electrons left when the oxygen leaves.

hypoxia The condition when oxygen is below the level necessary for plants and animals to survive.

Although the Cambrian explosion generated a large number of new phyla of Earth - type life, it actually crashed in a mass extinction not long after it began when oxygen levels fell and hydrogen sulphide levels rose again so that biodiversity at the family, genus, and species levels was decreasing around 515 million years ago (Gill et al, 2011; and Michael Marshall, New Scientist, January 5, 2011).

The fish carry a set of enzymes that, when oxygen levels drop, helps convert carbohydrates into alcohol that can be released through the gills.

When oxygen levels are quickly restored in babies after birth asphyxia, carbon dioxide levels are also quickly restored.

Both processes enable the cell to produce energy, but in different ways; respiration yields more energy overall, but fermentation can occur even when oxygen is completely absent.

Such loss of visual function can be observed in patients who have suffered a stroke or traumatic brain injury or when the oxygen supply to the brain has been reduced (cerebral hypoxia).

However, they can also somehow survive for months or years when their oxygen supply is exhausted.

These new findings will help to better identify microfossils in the rock record, especially at a critical time on Earth when oxygen started to be an important component of the atmosphere.

But why did life not explode when oxygen levels rose dramatically 2.1 billion years ago?

Ozone, which protects us from harmful ultraviolet radiation here on Earth, forms when oxygen produced by photosynthetic organisms (like trees and phytoplankton) synthesizes in light.

«All the questions we have about ancient evolutionary events — what our last common ancestor looked like, when methane metabolism arose, when oxygen - producing organisms evolved — they really benefit from having more genomes to look at and a more detailed tree,» says Parks.

The molecular probes Chan's group developed only become active when oxygen is lacking.

«This happens when oxygen supply to the damaged tissue is impaired and oxygen demand by the damaged cells greatly exceeds its supply.»

When they restored normal nitric oxide levels by having mice breathe in the short - lived gas — as patients have done in clinical trials — cell adhesion did not increase when oxygen levels decreased.

However, when the oxygen levels were lowered, the blood cells raced to the other end.

New work from a team including Carnegie's Mark Heinnickel, Wenqiang Yang, and Arthur Grossman identified a protein needed for assembling the photosynthetic apparatus that may help us understand the history of photosynthesis back in the early days of life on Earth, a time when oxygen was not abundant in the atmosphere.

«When the oxygen level dips below a certain level, [the lettuce dies and] begins to rot,» Labuza explains.

When an oxygen molecule comes in and wants to react with that surface, much less energy is needed to break the oxygen - oxygen bond in the oxygen molecule.

That could help solve a mystery about when oxygen first appeared in the solar system.

Researchers reasoned that the x-rays are produced when oxygen and sulfur ions plunge into the planet's atmosphere and capture electrons.

The most important oxygen sensor in the body is a protein named hypoxia - inducible factor, HIF for short, which is activated when oxygen levels dip.

But late in the Triassic period — between 210 million and 220 million years ago, when oxygen levels were similar to those of today — one species closely related to today's grasshoppers had wings ranging from 15 to 18 cm long, he notes.