"Chemical composition" refers to the specific types and amounts of elements that make up a substance or material. It describes what elements are present in the substance and the ratio at which they exist.
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People trying to avoid using marijuana often turn to the synthetic version, which is «dangerous and unpredictable,» said the speaker, because of the constantly
changing chemical composition.
Although the
exact chemical composition depends on the type of coal burned, all coal ash contains concentrated amounts of toxic elements, including arsenic, lead, and mercury.
People with dry eye disease don't produce enough tears or fail to make tears with the
proper chemical composition to keep their eyes hydrated.
The two are moving at the same speed and have the
same chemical composition, so the researchers think they have the same origin story.
The researchers added that one of the next steps in understanding these materials is to study the relation between the
local chemical composition and performance over different length and time scales under operating conditions.
Planetary scientist Benjamin Greenhagen of NASA's Jet Propulsion Laboratory in Pasadena, California, described a study he co-authored of lunar surface chemistry by LRO's Diviner Lunar Radiometer Experiment (DLRE), which
analyzes chemical composition by reading the lunar soil's infrared emissions — its internal heat.
Without the pumps, these compartments become less acidic and the
altered chemical composition of the petals changes the way light reflects off the flowers, giving them their blue hue.
Relationships between physiological indicators in blood, and their yield, as well
as chemical composition of milk obtained from organic dairy cows.
To trace the sources of those pollutants, Xu and his colleagues correlated meteorological measurements
with chemical compositions of air parcels sampled at 16 locations across the region.
Biochemist Job Description Biochemists
study chemical compositions, combinations and reactions, engaged in reproduction, growth, metabolism and heredity.
The diffuse gas clouds backlit by J1717 - 337 and NRAO530 show
chemical composition similar to the gas in active star forming regions, indicating that the diffuse gas is bathed in strong ultraviolet light.
«As we learn more about how the spin transition
affects chemical composition in carbonates, we improve our understanding of all iron - bearing minerals, enhancing our knowledge about lower mantle chemistry,» said Lobanov.
But moon rocks — some of them analyzed with ever more powerful spectroscopy to
reveal chemical composition here on Earth and some by robotic craft on the lunar surface itself — are still full of surprises.
The present 3 - D modeling study focuses on
aerosol chemical composition change since preindustrial times considering the secondary organic aerosol formation together with all other main aerosol components including nitrate.
The Aerosol Chemical Speciation Monitor is a thermal vaporization, electron impact, ionization mass spectrometer that measures
bulk chemical composition of the rapidly evaporating component of sub-micron aerosol particles in real time.
As we don't currently have any real Mars regolith to experiment on, Qiao and his team used a Mars simulant — a material developed by NASA that closely approximates the
known chemical composition and grain size of the real thing.
Human tears differ in
chemical composition based on the cause of the tears (such as laughter / joy, sadness, or reaction to outside stimulus like onion fumes).
The technology from Carnegie Airborn University can map a forest from the air, detecting different species and
even chemical compositions.
Greenpeace reports that in three cases bromine was present in more than one percent of the total
surface chemical composition of the material tested, prompting the environmental organization to conclude that there was «continued widespread use of either additive or reactive brominated flame retardants.»
More than 20 physico - chemical processes, mostly related to the presence of liquid water, contribute to the alteration of the
original chemical composition of the air inclusions in polar ice [3].
Sodium Carbonate (aka Washing Soda or Soda Ash) is a highly alkaline substance that's unique
chemical composition makes it excellent for household uses like degreasing, brightening and cleaning tough messes.
We build up bio-matrices with
defined chemical composition to mimic their environment under physiological and pathological conditions, to supply nutrition, to provide signaling, to create polarized conditions, and to, ultimately, allow us to perform cell - based drug screening in 3D model organs.
In general, primary aerosol components (black carbon, hydrocarbon - like organic aerosol and biomass burning organic aerosol) dominated the local traffic and wood burning emissions whereas secondary components (oxygenated organic aerosol, nitrate, ammonium, and sulfate) dominated the PM1
chemical composition during the LRT episode.
Phrases with «chemical composition»