Sentences with phrase «aromatic hydrocarbons»
Aromatic hydrocarbons are a type of chemical compound made up of atoms of carbon and hydrogen. They are known for having a distinct smell or aroma. Full definition
Properties of polycyclic aromatic hydrocarbons in local elliptical galaxies revealed by the Infrared Spectrograph on Spitzer
arxiv.org
Her favorite chemicals — favorite in the sense that she has studied them more than any others — are the polycyclic aromatic hydrocarbons in cigarette smoke, power - plant emissions, automobile exhaust, and other sources of combustion.
Bitumen is comprised primarily of polycyclic aromatic hydrocarbons which can be highly carcinogenic (the EPA has classified seven PAH compounds as probable human carcinogens) and requires extensive processing to make it thin enough to flow through pipes.
For example, polycyclic aromatic hydrocarbons such as benzopyrenes from wood smoke are toxic.
However, the types of organic compounds found in plant matter — dominated by aromatic hydrocarbons — underwent some chemical changes, but remained relatively resistant to impact pressures.
However, burning also produces another type of chemical called polynuclear aromatic hydrocarbons (PAHs).
Previous work has indicated a strong correlation between the amount of material identified by magnetic remanence and benzo (a) pyrene, a carcinogenic polycyclic aromatic hydrocarbon found in particulates, Maher says.
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.
«Though we haven't yet observed polycyclic aromatic hydrocarbons directly, we understand their chemistry quite well.
Or it could have been big, complex organic molecules like polycyclic aromatic hydrocarbons synthesized between the stars, incorporated into the primordial stuff of comets and asteroids, and still raining onto the surface of every body in the solar system.
The Canadian fire released large quantities of dioxins and aromatic hydrocarbons into the atmosphere, and oil into groundwater.
The Vincent Center for Reproductive Biology, which Tilly directs Fact sheet on polycyclic aromatic hydrocarbons Centers for Disease Control and Prevention tobacco information site
Polycyclic aromatic hydrocarbons result from many forms of combustion, including diesel engines, automotive exhaust, coal burning, grilling of meat and cigarette smoking.
«Global Long - Range Transport and Lung - Cancer Risk from Polycyclic Aromatic Hydrocarbons Shielded by Coatings of Organic Aerosol.»
Indole -3-carbinol in the maternal diet provides chemoprotection for the fetus against transplacental carcinogenesis by the polycyclic aromatic hydrocarbon dibenzo [a, l] pyrene.
It is processed to remove potentially harmful aromatic hydrocarbons that exist in pine and cedar oils.
«We found that snow absorbs certain polycyclic aromatic hydrocarbons which are organic pollutants known to be toxic and carcinogenic,» says Yevgen Nazarenko, a postdoctoral researcher working with Parisa A. Ariya, professor at McGill's Department of Atmospheric and Oceanic Sciences and Department of Chemistry, and collaborating with Prof. Patrice Seers» team at École de technologie supérieure.
It reported that the amount of carcinogenic materials - polynuclear aromatic hydrocarbons - known to be contained in the clay pigeons was below amounts the lab instruments could detect.
• Polycyclic aromatic hydrocarbons found in tobacco smoke.
However, the types of organic compounds found in plant matter — dominated by aromatic hydrocarbons - underwent some chemical changes, but remained relatively resistant to impact pressures.
The zeolite catalyst then converts these hydrogenated products into light olefins and aromatic hydrocarbons in a yield as much as three times higher than that produced with the pure pyrolysis oil.
The evaporation process can also concentrate the toxic compounds left behind, particularly oil - derived compounds called polycyclic aromatic hydrocarbons, or PAHs.
Polycyclic aromatic hydrocarbons (PAHs) are compounds released from the incomplete burning of wood, charcoal, fossil fuels or any other organic substance.
The future of proposed studies on nanoparticles and oil sands contaminants such as polycyclic aromatic hydrocarbons (PAHs) may now be dead.
Diluted bitumen is more likely to cause corrosion in the pipeline as well as in the tankers, is heavier than water and therefore harder to clean up, and can threaten human health as it contains toxins such as benzene, polycyclic aromatic hydrocarbons, and n - hexane, which can affect the human central nervous system.
Beer marinades are actually an effective way of reducing levels of polycyclic aromatic hydrocarbons (PAHs), a group of carcinogenic compounds that form on grilled meat when fats and juices interact with an open flame, finds a new study in the Journal of Agricultural and Food Chemistry.
When beef is overcooked it produces heterocyclic amines and polycyclic aromatic hydrocarbons which are highly carcinogenic.
Lotions on the inside of the diaper lining also have the potential to contain polycyclic aromatic hydrocarbons, which have also been identified as cancer - causing chemicals.
The main component of mothballs is naphthalene, an aromatic hydrocarbon, which can cause all sorts of neurological problems, as well as hemolytic anemia, kidney and liver damage and cataracts.
These lotions often include petrolatum, essentially the same substance as Vaseline, which has the potential to be contaminated with polycyclic aromatic hydrocarbons (PAHs), cancer - causing chemicals found in crude oil, according to the U.S. Environmental Working Group, an organization that devotes itself to educating consumers about health hazards posed by a variety of products.
In fact, the E.P.A. says the lake that Martens bobbed around in for about ten minutes while wearing a life jacket contains the following substances: «mercury, polychlorinated biphenyls (PCBs); pesticides; creosotes; heavy metals including lead, cobalt, and mercury; polycyclic aromatic hydrocarbons (PAHs); and volatile organic compounds (VOCs) such as chlorobenzene.»
The EPA proposed in April that this portion of the creek, downstream from an industrial park, be added as the sediment is contaminated with mercury and polycyclic aromatic hydrocarbons, or PAHs.
Aromatic molecules such as polycyclic aromatic hydrocarbons (PAHs) are known to exist in the interstellar medium owing to their characteristic infrared emission features.
Polycyclic aromatic hydrocarbons and polycyclic aromatic nitrogen heterocycles are thought to be widespread throughout the universe, because these classes of molecules are probably responsible for the unidentified infrared bands, a set of emission features seen in numerous Galactic and extragalactic sources.
Lab fish that are exposed to the residues of incomplete combustion, so - called polycyclic aromatic hydrocarbons (PAHs), have a higher risk of developing cancer and DNA damage.
But if those aromatic hydrocarbons were treated with an acid to create aniline or another amine, after some additional steps the newly synthesized molecules very efficiently absorbed light particles from specific wavelengths in the visible spectrum.
Polycyclic aromatic hydrocarbons (PAHs) present in tobacco smoke are one of the main culprits behind lung cancer.
Other studies found that firefighters and other rescue workers had elevated levels of chemical toxicants in their blood and urine; for example, 321 firefighters tested at the end of September 2001 had elevated levels of the polycyclic aromatic hydrocarbons that result from jet fuel burning and are human carcinogens.
Then he assembled timelines of two other substances in the cores: polycyclic aromatic hydrocarbons, which are released when plant matter is burned, and plant waxes, which allow paleoclimatologists to deduce whether nearby land was forested or cleared, presumably for farming.
Aromatic hydrocarbons had dropped to less than 200 ppm, suitable for freeway landscaping.
There are over 100 polycyclic aromatic hydrocarbons (PAHs) found in oil, coal and tar, which are readily released into the environment when fossil fuels are burned.
Dr Hauptmann said: «The microbial potential to degrade anthropogenic contaminants, including polychlorinated biphenyls (PCB), polycyclic aromatic hydrocarbons (PAHs), and the heavy metals mercury and lead, was found to be widespread, and not limited to regions close to human activities.»
We now know that bitumen can be a source of polycyclic aromatic hydrocarbons (PAHs)-- pollutants that have been linked to a number of health problems (see «Poisonous ingredients»).