Sentences with phrase «of precursor chemicals»

Factors that affect ozone formation include heat, concentrations of precursor chemicals, and methane emissions.

Not exact matches

Rich in zinc, which can help boost memory and cognitive function, pumpkin seeds also contain plenty of magnesium, B vitamins and tryptophan, which is a precursor to serotonin, a mood - boosting brain chemical.

(There is evidence of possible extraterrestrial life, i.e. precursor chemicals, but not sentient aliens.)

... The direct synthesis of... nucleotides from prebiotic precursors in reasonable yield and unaccompanied by larger amounts of unrelated molecules could not be achieved by presently known chemical reactions» (5).

Before the deal was struck on Syria's chemical weapons, French intelligence estimated that Syria possessed more than 1,000 metric tons of chemical warfare agents and precursor chemicals, including mustard blister agent, sarin nerve agent, and VX nerve agent.

Back then, as a lowly lab tech at a chemical company, Arnold could never get hold of the precursor, a prohibitively expensive synthetic progestogen known as levonorgestrel, the active ingredient in the morning - after pill.

Now her team has finished the end of the pathway, engineering yeasts to synthesise finished drugs from another type of precursor molecule (Nature Chemical Biology, DOI: 10.1038 / nchembio.1613).

To do so, he sat down with The Merck Index, a standard reference manual for chemicals, drugs, and other compounds, and turned to the section on the class of hormones to which norbolethone's precursor belonged.

Arnold added the steroid precursors he would need to the regular list of laboratory chemicals he ordered through the company, and nobody was the wiser.

The chemical mechanisms of RNA - catalyzed reactions are discussed with emphasis on the self - splicing ribosomal RNA precursor of Tetrahymena and the enzymatic activities of its intervening sequence RNA.

Simple aromatic molecules such as benzonitrile may be precursors for polycyclic aromatic hydrocarbon formation, providing a chemical link to the carriers of the unidentified infrared bands.

Cobbling together the genes of three different species, chemical engineer Jay Keasling (Discover's 2006 Scientist of the Year) of the University of California at Berkeley transformed a metabolic pathway in yeast that allows the engineered microbe to produce a precursor to artemisinin, a compound used to treat malaria.

«We have demonstrated that we can electrospray liquid precursors inside a high vacuum environment of an electron microscope and then use electrons to facilitate useful chemical transformations,» said Fedorov.

A prodrug is the precursor of a drug and must undergo a chemical conversion before becoming an active pharmacological agent.

To demonstrate the material, the lab placed the precursor into its custom chemical vapor deposition (CVD) furnace and used it to coat an array of light - absorbing, semiconducting titanium dioxide nanorods.

If the amount of meth detected is at such a low level, some state regulators think, meth's precursor chemicals are at low levels too.

Once the families were identified using the chemical DNA, their evolution was studied with the help of their ages and kinematical properties obtained from the space mission Hipparcos, the precursor of Gaia, the spacecraft orbiting Earth that was launched by the European Space Agency and is almost halfway through a 5 - year project to map the sky.

Studies of embryonic stem cells revealed that NANOG protein levels can be lowered by a chemical process known as methylation, which involves putting a methyl group chemical tag on a protein's messenger RNA (mRNA) precursor.

In just two years of work with the Robert C. Byrd Green Bank Telescope, astronomers have discovered eight new organic molecules near the center of the Milky Way, bolstering theories that key chemical precursors of life were first forged in deep space.

The rats were then divided into eight treatment groups of 15 animals each to test slightly differing combinations of chemicals that would allow the precursor cells to take on their desired roles.

This particular foam is one of about 1,300 that Arsenal Medical researchers tested as they experimented with variables such as the rate of expansion and the amount of time in which the two chemical precursors became a solid foam.

This problem, which Hurst calls single atom failure, may one day be a common nuisance in everyday life, and will be prevented only by heroic new methods of chemical analysis, of which Hurstís resonance technique is a precursor.

In the famous Miller - Urey experiment of the 1950s, researchers produced a rich soup of amino acids by running an electric current through flasks containing elements of a primitive Earth, thus showing how precursor chemicals could have formed here.

Comparing Purple Kush with another popular form of the same plant — the hemp - fiber producing Finola varietal — the group found that one gene critical for churning out the precursors to the chemical that gives pot its kick, tetrahydrocannabinol or THC, had been turned off.

Astronomers recently saw the chemical signature of phosphorus - oxygen molecules in a star - forming region, suggesting that simple precursors of DNA float in the soup of new solar systems.

In a paper appearing in the Feb. 13 issue of Nature Biotechnology, the researchers showed that they could significantly enhance the yield of glucaric acid, a chemical that is a precursor to products such as nylons and detergents.

The spacecraft's sensitive spectrometer was able to register the chemical signatures not only of water vapor but also of hydrogen cyanide, carbon monoxide, and carbon dioxide — all precursors of the more complex molecules that scientists think eventually gave rise to life on Earth.

Tony and his clientele admit to taking stronger «smart drugs» than those he's selling tonight, drugs such as piracetam (which supposedly boosts levels of acetylcholine in the brain), hydergine and propanolol (both said to work by increasing blood flow through the brain), L - Dopa (a chemical precursor of the neurotransmitter dopamine), phenytoin, vasopressin, deprenyl, the list seems almost endless.

Syria possesses about 1,000 metric tons of chemicals for weapons, Walker said, with nearly all of it in the form of chemical precursors for sarin and mustard gas.

The CWC outlaws the production, stockpiling and use of chemical weapons and their precursors.

«The research group focused on three or four different catalytic reactions used in high production volume chemicals, including this one for producing a precursor to nylon, which as an industry has enormous applications,» said Slowing, who is also an adjunct assistant professor of chemistry at Iowa State University.

They were looking for a site with a venting process that produces a lot of hydrogen because of the potential it holds for the chemical, or abiotic, creation of organic molecules like methane — possible precursors to the prebiotic compounds from which life on Earth emerged.

If meteorites create most of the direct chemical precursors of life, our solar system might be an unusual case.

Many systems have successfully reduced carbon dioxide to chemical and fuel precursors, such as carbon monoxide or a mix of carbon monoxide and hydrogen known as syngas.

The brain is well buffered against the effect of arbitrary increases or decreases in circulating chemicals so that simply consuming food additives which are acetylcholine precursors will not normally increase your brain acetylcholine level.

The tightened security and heightened awareness following September 11 wasnt enough to stop Scientific American, just a few blocks away from Grand Central station and one floor below American Media Group (whose Palm Beach, Fla., office had just received anthrax), from acquiring the precursors of one of the worlds most notorious chemical weapons.

They found that the ELVOC formation happens very fast and that the chemical structure of the precursor gases determines how effectively they form ELVOC's.

They then split each of these two strains into three groups and to each group added genes for one of three different metabolic pathways that allow the microbes to make chemical precursors for either gasoline, diesel, or jet fuel.

This lack of specificity allows the enzymes to bind to different chemical precursors, which is the reason for a larger number of products.

But this only produced an intermediate compound that was several chemical steps short of artemisinic acid, the precursor they were aiming at.

Being able to literally pull apart these triazoles into their constituent precursors and then unlock their chemical reactivity in new ways is now possible with the assistance of mechanical force,» he says.»

One to three layers of graphene are formed on the nickel foam in a chemical vapor deposition (CVD) furnace, and the iron, manganese and phosphorus are added on top of that, also via CVD and from a single precursor.

Biologists are warming to the view that the emergence of life from chemical precursors is a quite probable event which does not require billions of years to get under way.

Wang, T, Xue, L, Brimblecombe, P, Lam, YF, Li, L and Zhang, L 2017 Ozone pollution in China: A review of concentrations, meteorological influences, chemical precursors, and effects.

Thanks to this new interdisciplinary pursuit of astrochemistry, the 140 - foot went on to discover formic acid (you know it as insect venom), methanol, acetaldehyde (the chemical responsible for hangovers), and cyanoacetylene (a possible precursor to the DNA acid cytosine).

To create hollow and solid microstructures, the researchers used an organic polymer precursor doped with photoinitiator made of off - the - shelf chemical components.

Methane is of interest as a simple precursor chemical for life.

The Orbitrap Mass Analyzer combined with advanced quadrupole, S - lens, and a high - performance HCD collision cell for MS / MS plus features such as up to 18 hz scan rate, data - independent analysis (DIA), selected - ion monitoring (SIM), and spectral multiplexing up to ten precursors / scan make this system a state - of - the - art instrument for chemical and biochemical molecules analysis with up to 280,000 resolution, < 1 ppm mass accuracy, and femtogram sensitivity.

In search of meteor showers, an airborne research mission indicates that the chemical precursors to life found in comet dust into early Earth's atmosphere.

To sidestep the slow production, Cornell University's Jiwoong Park used Mo (CO) 6 or W (CO) 6 as precursors in a chemical vapor deposition process to form films of MoS2 and WS2, respectively, that were only three atoms thick but covered an area of about 65 cm2 (Nature 2015, DOI: 10.1038 / nature14417).