"Oxygen molecules" refers to very tiny particles that make up the air we breathe. These molecules are essential for living things to survive because they help our bodies produce energy.
Full definition
Otherwise, it would be difficult to tell what the «normal» amount of circulating reactive
oxygen molecules in the animal's body was.
The new cobalt catalyst also splits water into hydrogen and oxygen without creating the kind of
reactive oxygen molecules that can damage DNA or other processes essential to continuing life.
They estimate this temperature based on measurements of the microwave emissions
of oxygen molecules in the atmosphere, which increase proportional to temperature.
The researchers used satellites to measure heat in the form of microwave radiation emitted
by oxygen molecules in the atmosphere from 1979 to 2005.
It is also a powerful antioxidant which helps to prevent cell damage caused by
unstable oxygen molecules known as free radicals.
The 12 - sided particles split
oxygen molecules into charged oxygen ions, a reaction that's needed in fuel cells.
In particular, an oxygen reduction catalyst extracts electrons
from oxygen molecules, while an oxygen evolution catalyst drives the reaction in the opposite direction.
The team suggests that earthly oxygen ions most likely originated in our atmosphere's ozone layer, where certain wavelengths of sunlight break apart ozone into
regular oxygen molecules and single atoms.
Note, however, that the bulk of the atmosphere is made up of nitrogen and
oxygen molecules which don't absorb IR at all.
Interestingly, it is also possible to inject an additional electron to an
individual oxygen molecule with the same tip, and then observe the transition from the inactive to the active state.
* It is also a potent antioxidant that can protect the body's cells and molecules from damage by free radicals and reactive
oxygen molecules generated during normal metabolism and typical environmental exposures.
This process of
activating oxygen molecules by adding electrons is ubiquitous — all living organisms use this trick, and modern fuel cells also work in this way.
The researchers used satellites to measure heat in the form of microwave radiation emitted by
oxygen molecules in the atmosphere from 1979 to 2005.
An electrical charge — from lightning or a man - made source such as an electrical generator — splits atmospheric nitrogen and
oxygen molecules into separate atoms.
Fake volcanoes would further damage weakened ozone layer So - called geoengineering, one of many proposals to fend off global warming, calls for injecting tiny particles of sulfur paired
with oxygen molecules into the stratosphere to mimic a major volcanic eruption.
When the quantum dots absorb ambient light, they transfer some of that energy to nearby dye particles, causing the crystal violet to release a kind of high -
energy oxygen molecule that kills microbes.
This is surprising since it means that
toxic oxygen molecules formed in heat - damaged chloroplasts during photosynthetic reactions during the light are likely not the major culprits that cause bleaching.
It has been known in biology for a long time that the excited
oxygen molecule singlet oxygen is the main cause of aging in cells.
That light is absorbed by the chlorine - based molecules, which then excite
nearby oxygen molecules, creating a highly reactive form of oxygen, known as singlet oxygen, that rips apart nearby biomolecules and kills the tumor cell.
Hans Røy, a geomicrobiologist at Aarhus University, found that each cell uses about one
oxygen molecule per second — roughly one hundred - thousandth the metabolic rate of typical surface bacteria.
Samuel Wilson, M.D., senior NIEHS researcher on the team, explained that the damage is caused by oxidative stress, or the generation of
free oxygen molecules, in response to environmental factors, such as ultraviolet exposure, diet, and chemical compounds in paints, plastics, and other consumer products.
It's a sure bet that you have inhaled
oxygen molecules produced by Synechococcus, which today contributes a significant proportion of the oxygen available on Earth.
Also surprisingly, this functional switch is mediated by a
single oxygen molecule, which attaches to a single amino acid at a very critical place in IRE - 1 — and this relatively subtle alteration has a dramatic effect.»
Since iron is needed in the formation of the heme component of hemoglobin, increasing the levels of iron in the blood can help facilitate the production of more hemoglobin, allowing for
more oxygen molecules to be carried to the cells.
Dr Kenneth Cooper, author of Aerobics, believes excessive exercise also produces unstable
oxygen molecules called free radicals that cause harm to the body.
At TU Wien (Vienna), it has become possible to control one of the most important chemical processes:
switching oxygen molecules between a reactive and unreactive state.
To purify the spring water, Mountain Pure infuses it with ozone gas that is produced by
subjecting oxygen molecules to a high electrical voltage.
This extra energy, they deduced, must go into forming a new, highly excited state of the trans molecule, which in turn transfers its energy to
surrounding oxygen molecules.
But satellite measurements of radiation shed by
oxygen molecules suggested that the bottom 10 kilometers of Earth's atmosphere had cooled 0.05 °C per decade in the same period.
High - resolution x-rays of the antibodies showed that this theory made sense: The antibodies include sites that can
bind oxygen molecules, others that can hold water molecules, and an amino acid where UV light can be absorbed.
Roth and his colleagues instead went looking in Hubble's ultraviolet images, which can capture the light emitted when hydrogen and
oxygen molecules collide with stray electrons.
At the Vienna University of Technology, it has now been possible to selectively switch individual
oxygen molecules sitting on a titanium oxide surface between a non-reactive to a reactive state using a special force microscope.
Oxygen atoms are depicted in pink, and hydrogen in blue, in oxygen reduction and evolution reactions that transfer electrons between two species and
convert oxygen molecules to hydroxide ions and vice versa.
That's because Virent's biogasoline does not have
oxygen molecules along for the ride, unlike ethanol (the oxygen simply takes up space without adding much in the way of fuel, hence ethanol's lower energy density).
It's hard to
keep oxygen molecules around, despite the fact that it's the third-most abundant element in the universe, forged in the superhot, superdense core of stars.
Phrases with «oxygen molecules»