Sentences with phrase «when oxygen levels»

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..

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.

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

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.

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

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.

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.

It had been suggested that only when oxygen levels rose to above 17 % (it is 21 % today) that widespread fires would be found.

When oxygen levels are restored to normal, the eye senses it as a lack of oxygen and responds by growing new blood vessels, which often leads to excessive growth and damage to vision.

The HREs only switch on protein production when oxygen levels are very low — for example, during wound healing.

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

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

Not exact matches

Other things to consider when bringing an infant on a plane include colder temperatures in the cabin, loud noise levels during takeoff, the change in oxygen level during the flight, and the presence of a properly secured safety seat, according to the Mayo Clinic.

When babies rouse, oxygen levels and heart rates rise, which is good for brain growth and development and immune functioning.

It will monitor your baby's heart rate and oxygen levels and is designed to alert you when those vitals are outside normal range.

They have done things where they check the baby heart rate and breathing rate while they are breast feeding compared to when they are being fed from a bottle and their heart rate is better, the breathing is better, the oxygen levels are better.

Scientists still don't know exactly why some babies die without explanation, but recent research points to the possibility of brain stem abnormalities that prevent some babies from being able to rouse from sleep and gasp for air when their blood oxygen levels are too low.

It's programmed to alert both your phone and the «base station» when your baby's heart rate or oxygen drops below a safe level, so you're sure to wake up and check your baby.

A 2012 medical study suggests that sleeping on your left side when you're pregnant can increase healthy blood flow and provide the optimum oxygen levels for you and your baby.

In a 2009 study, researchers at Harvard's MassGeneral Hospital for Children as well as other institutions analyzed the blood oxygen levels of newborns when they were placed in cribs versus car seats and found that nearly one - quarter of the time that the babies were in car seats, their oxygen saturation levels (the ratio of oxygen - saturated hemoglobin to total hemoglobin in their blood) dropped below 95 percent, the cutoff for what is considered normal.

And new research shows how genetic alterations in this odd - colored blood have helped the octopus colonize the world's wide oceans — from the deep, freezing Antarctic to the warm equatorial tropics.The iron - based protein (hemoglobin) that carries oxygen in the blood for us red - blooded vertebrates becomes ineffective when faced with low - oxygen levels.

Porcar's team engineered gene switches in Escherichia coli to produce proteins that emit different coloured fluorescent light when factors such as heat, acidity and oxygen levels change.

Arguably the most convenient and least invasive way of doing that is through functional magnetic resonance imaging, or fMRI — a technique that measures changes in blood flow and blood oxygen levels in the brain, thereby showing which parts of the brain are activated when people perform various tasks.

Researchers working in Papua New Guinea think they may have been wiped out when the level of oxygen in the oceans rose dramatically, stimulating the evolution of oxygen - hungry fish that simply out - competed the ammonites for resources.

The latest results come at a time when scientists are already reconsidering what was happening to ocean oxygen levels during this crucial period.

«Our work pinpoints the time when the ocean began accumulating oxygen at levels that would substantially change the ocean's chemistry and it's about 250 million years earlier than what we knew for the atmosphere.

Thanks to evolution, the animals living there have adapted to these conditions and will have little chance to adjust when the combination of warming and lower oxygen levels hits.

When blood flow and oxygen levels are low, a transcription factor called hypoxia - inducible factor (HIF) triggers the production of a chemical called VEGF.

When the researchers manipulated the cell's genetics to increase levels of ALKBH5 without exposing them to low oxygen, they found this also decreased methylation of NANOG mRNA and increased the numbers of breast cancer stem cells.

The UCLA researchers choose instead to grow theirs at higher oxygen levels and chop the blobs at the 35 - day mark, when they are as wide as three millimeters, and then about every two weeks after.

Mark Gladwin, a researcher in pulmonary medicine at the National Heart, Lung, and Blood Institute (NHLBI) in Bethesda, Maryland, says that the nitrite levels in the Tibetans» blood are similar to those NHLBI researchers are using to treat heart and liver injuries caused when blood is restored to oxygen - deprived tissues in experimental animals.

At 62 °F and 72 °F, the critical oxygen level was less than 2 milligrams of oxygen per liter of water; this increased to between 2 and 3 milligrams per liter at 82 °F, and when testing recently fed and infected crabs.

From that context, the higher oxygen level can be linked to a time when groundwater was present in the rover's Gale Crater study area.

Mangrove rivulus, which can live out of the water for extended periods of time (days or weeks, as long as the conditions are moist), uses its specialised jumping technique when water has low oxygen concentrations or high levels of hydrogen sulphide, or to escape predators and search for terrestrial prey such as crickets.

Most importantly, when the team disabled the HIF - 1α cellular alarm, BMP signaling in human FOP bone progenitor cells was restored to levels comparable to cells in normal oxygen.

By early August, concentrations decreased until they returned to background levels when normal oxygen conditions returned in late September.

When the scientists applied nitroglycerin patches, which cause increased blood flow to the skin, to nine normal mice breathing air with adequate oxygen, EPO and red blood cell levels shot up, confirming that diverting blood into the skin drives the production of EPO.

Cystine is responsible for maintaining high levels of antioxidants that disarm free radicals of oxygen; so when the researchers got rid of this nutrient, the cancer cells essentially died by their own hand of free radical damage.

«We already know there are physiological benefits in the newborns when they are held skin - to - skin,» Dr. Isaza said, such as stabilization of heart rate, breathing patterns and blood oxygen levels, gains in sleep time and weight, decreased crying, greater breastfeeding success and earlier hospital discharge.

Professor Roffe commented: «When a stroke happens either due to a blood clot or a brain haemorrhage, part of the brain dies because it's being starved of oxygen, and other parts of the brain are unstable and vulnerable to low oxygen levels.

«Lungs started to appear in fish underwater when they evolved air breathing in response to low oxygen levels in water 350 to 400 million years ago,» says study author Peter Madsen, a biologist at Aarhus University in Denmark.

The technique relies on the observation that when activity in an area of the brain increases, blood - oxygen levels in that region rise, which modulates the MRI signal.

Professor Graham Shields - Zhou (UCL Earth Sciences), one of the co-authors and Dr Tostevin's PhD supervisor, said: «We honed in on the last 10 million years of the Proterozoic Eon as the interval of Earth's history when today's major animal groups first grew shells and churned up the sediment, and found that oxygen levels were important to the relationship between environmental conditions and the early development of animals.»

When the pupae opened their spiracles completely, the researchers found oxygen levels reached the danger zone.

Physiologist Dino Giussani and colleagues at the University of Cambridge in the United Kingdom theorized that hypoxia promotes harm in the womb primarily through stress caused when the low level of oxygen creates an overload of highly reactive molecules known as free radicals.

The research made use of functional magnetic resonance imaging (fMRI)-- which measures changes in the blood oxygen levels in the brain — and also multivariate analysis when comparing the brain activity of different viewers.