Sentences with phrase «by aromatic hydrocarbons»

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, the types of organic compounds found in plant matter — dominated by aromatic hydrocarbons — underwent some chemical changes, but remained relatively resistant to impact pressures.

Not exact matches

Until the end of September, the petrol stations will be replacing their superunleaded petrol with «summer petrol» in which a tenth of the aromatic hydrocarbons are replaced by fuel oxygenates such as methyl tertiary butyl ether, or MTBE.

The research builds on earlier work by the Auke Bay Laboratories, part of NOAA Fisheries» Alaska Fisheries Science Center, which found much reduced survival of pink salmon exposed as embryos to polycyclic aromatic hydrocarbons (PAH) from crude oil.

Their particular focus was a class of molecules, called aromatic hydrocarbons, that are distinguished by their stability and restrained reactivity.

Because the process makes a blend of hydrocarbons, it does not lack the aromatic compounds that seal aircraft engines, like the biojet fuel produced from camelina oil by UOP.

Also present in the animals» blood and bile were signs of exposure to carcinogenic polycyclic aromatic hydrocarbons (PAHs)-- a family of more than 100 substances generated by the partial burning of oil, gas and other materials.

Polycyclic aromatic hydrocarbons, or PAHs, from motorbikes and other vehicles are caused by incomplete combustion.

The study adds to earlier evidence that mothers» exposures to polycyclic aromatic hydrocarbons (PAHs), which are emitted by the burning of fossil fuels and other organic materials, are linked to children's behavioral problems associated with Attention Deficit Hyperactivity Disorder (ADHD).

By giving a single small dose of certain chemicals (aromatic polycyclic hydrocarbons) to selected strains of female rats he found he could produce, within a few weeks, malignant mammary tumors — many of which were hormone dependent — in 100 percent of the treated animals.

«Global Long - Range Transport and Lung - Cancer Risk from Polycyclic Aromatic Hydrocarbons Shielded by Coatings of Organic Aerosol.»

Properties of polycyclic aromatic hydrocarbons in local elliptical galaxies revealed by the Infrared Spectrograph on Spitzer

Certain particle compounds may directly generate ROS in vivo because of their surface chemistry (eg, metals, organic compounds, and semiquinones) or after bioactivation by cytochrome P450 systems (eg, polycyclic aromatic hydrocarbon conversion to quinones).6, 290 a, 290 b A particle surface or anions present on otherwise more inert particles may disrupt iron homeostasis in the lung and thereby also generate ROS via Fenton reactions.291 Other PM constituents may do so indirectly by the upregulation of endogenous cellular sources (eg, nicotinamide adenine dinucleotide phosphate [NADPH]-RRB- oxidase) 292,293 or by perturbing organelle function (eg, mitochondria) by taken - up PM components.261 Particle stimulation of irritant and afferent ANS fibers may also play a role in local and systemic oxidative stress formation.294 Given the rich antioxidant defenses in the lung fluid, secondarily generated oxidization products of endogenous molecules (eg, oxidized phospholipids, proteins) or a reduction in endogenous antioxidants per se may be responsible at least in part for the state of oxidative stress in the lungs (along with instigating the subsequent cellular responses) rather than ROS derived directly from PM and its constituents.

According to the National Cancer Institute, polycyclic aromatic hydrocarbons and heterocyclic amines form when meat is cooked under high temperatures, as happens during smoking over an open flame or by grilling.

Indole -3-carbinol in the maternal diet provides chemoprotection for the fetus against transplacental carcinogenesis by the polycyclic aromatic hydrocarbon dibenzo [a, l] pyrene.

Benzene (C6H6): An aromatic hydrocarbon present in small proportion in some crude oils and made commercially from petroleum by the catalytic reforming of naphthenes in petroleum naphtha.

Aromatics: Hydrocarbons characterized by unsaturated ring structures of carbon atoms.

Recent studies by the U.S. Geological Survey have detected polycyclic aromatic hydrocarbons, some of which are carcinogenic, in the soil and water around mountaintop - removal operations.

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.