Sentences with phrase «source of the organic compounds»

Not exact matches

However, the toys themselves provide a source of nutrients: the plastic materials — often low - quality polymers — release substantial amounts of organic carbon compounds.

The acids form when organic, carbon - containing compounds and water are zapped with a source of energy, such as photons — a process that can take place on Earth or in space.

Consumer goods like paints, inks and bath products make up only a tiny sliver of the sources releasing volatile organic compounds into the atmosphere.

In a new study published in the Proceedings of the National Academy of Sciences (PNAS), researchers from Innsbruck, Austria, present the world's first chemical fingerprint of urban emission sources of volatile organic compounds (VOCs).

The air we breathe is chock - full of organic compounds, tiny liquid or solid particles that come from hundreds of sources including trees, volcanoes, cars, trucks and wood fires.

With many sources of pollution in some parts of the world, however, air pollution also can contain a mix of hazardous gaseous molecules, such as carbon monoxide, formaldehyde, sulfur dioxide and other volatile organic compounds.

Last year, EPA finalized a set of New Source Performance Standards for the oil and gas industry limiting smog - creating volatile organic compounds (VOCs) and hazardous air pollutants.

A promising source of hydrogen is the organic compound cellulose, which is a key component of plants and the most abundant biopolymer on Earth.

«We managed to present the first molecular evidence of a direct and ubiquitous source of ELVOCs arising from the oxidation of monoterpenes and other volatile organic compounds in the gas phase.»

Cellulose, the world's most abundant organic compound, has long interested researchers as a source of renewable fuel.

The samples revealed that the ratios among certain «volatile organic compounds» (chemicals that can be a source of scents and odors) in the atmosphere increase or decrease along specific directions.

«It is well known that the organic matter is the principal source of energy for the organisms performing mercury methylation, but the strong coupling between specific organic compounds and mercury methylation rates surprised us,» says Erik Björn, associate professor at the Department of Chemistry at Umeå University.

Biologists were surprised to discover that the ecosystems found on the ocean floor along these mid-ocean ridges, consisting of complex organisms like tube worms, clams, and crabs, were dependent for their food on thermophilic chemosynthetic bacteria, which produced organic compounds using the oxidation of inorganic molecules as an energy source, instead of sunlight.

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.

The claim that a product is «natural» is one to pay special attention to, because it can be used by companies to get around organic certification, and because the meaning of the word is easily stretched and manipulated — after all, even the most complex chemical compound can be traced to a natural source at some point on its journey to the supermarket shelf.

Sun Potion offers a delicious, ultra-high-quality, organic Ashwagandha root powder sourced from small organic farms in Northern India that is cold water extracted for maximum potency and preservation of heat - sensitive medicinal compounds in the plant.

However, one of the most practical amino acid classifications comes from understanding how we source these vital organic compounds.

For most people, the major sources of mercury exposure (Table 1) are elemental mercury vapor from dental amalgams and methylmercury (an organic mercury compound) from dietary fish.

In its most basic state, carbohydrates are organic compounds which are found in tissues and food, that can be broken down to be one of the 3 major sources of energy for animals and humans.

MSM is an organic source of sulfur, a compound used by cartilage.

Sea salt comes from sea spray over the oceans, dust from dry desert areas, black carbon from burning of forests and fossil fuels, sulphates derive from ocean plankton and burning coal, nitrates derive from fertiliser use, car exhausts and lightning, and secondary organics come from the stew of volatile organic compounds from industrial and natural sources alike.

Furniture (especially particle board), carpeting, and paint are common sources of volatile organic compounds (VOCs), a family of chemicals that are frequently «offgassed.»

These include: plants receiving NO3 as their sole source of nitrogen (N) accumulate less organic N under elevated than ambient CO2 (refs 7,911); plants subjected to a pulse of 15N - NO3 - incorporate less 15N into organic N compounds under elevated than ambient CO2 (ref.

In reality, there are a host of both natural and anthropogenic aerosols, ranging from sea salt (the major source of cloud nuclei over the ocean) to biogenic aerosols from forests (the «smoke» of the Great Smoky Mountains of the Eastern US) to partially burnt organic materials (the «brown cloud» over Asia, generally absorptive / warming) to various sulfur compounds (generally reflective / cooling).

Recalling the concern reflected in the outcome document of the United Nations Conference on Sustainable Development, entitled «The future we want», 1 that the health of oceans and marine biodiversity are negatively affected by marine pollution, including marine debris, especially plastic, persistent organic pollutants, heavy metals and nitrogen - based compounds, from numerous marine and land - based sources, and the commitment to take action to significantly reduce the incidence and impacts of such pollution on marine ecosystems, Noting the international action being taken to promote the sound management of chemicals throughout their life cycle and waste in ways that lead to the prevention and minimization of significant adverse effects on human health and the environment, Recalling the Manila Declaration on Furthering the Implementation of the Global Programme of Action for the Protection of the Marine Environment from Land - based Activities adopted by the Third Intergovernmental Review Meeting on the Implementation of the Global Programme of Action for the Protection of the Marine Environment from Land - based Activities, which highlighted the relevance of the Honolulu Strategy and the Honolulu Commitment and recommended the establishment of a global partnership on marine litter, Taking note of the decisions adopted by the eleventh Conference of the Parties to the Convention on Biological Diversity on addressing the impacts of marine debris on marine and coastal biodiversity, Recalling that the General Assembly declared 2014 the International Year of Small Island Developing States and that such States have identified waste management among their priorities for action, Noting with concern the serious impact which marine litter, including plastics stemming from land and sea - based sources, can have on the marine environment, marine ecosystem services, marine natural resources, fisheries, tourism and the economy, as well as the potential risks to human health; 1.

In addition to methane emissions, natural gas sector operations and infrastructure represent a significant source of CO2; volatile organic compounds (VOCs), which are chemicals that contribute to ground - level ozone and smog; and hazardous air pollutants (HAPs).

In fact, some types of trees actively consume certain types of air pollution.Looking at oxygenated volatile organic compounds (oVOCs)-- which are emitted from both manmade and non-manmade sources and can have serious effects on the health of the environment and humans — the team found that deciduous plants take up oVOCs as much as four times more rapidly than previously thought.

• Rated by the Forest Stewardship Council (FSC) or Programme for the Endorsement of ForestCertification (PEFC) schemes • Made from a sustainable source or material • Uses organic materials • Produced with chemical - free dyes • Recycled or upcycled — old items repaired with new paint and fittings • Low carbon footprint and road miles • Low VOCs (volatile organic compounds) • Low chemical content or solvent - free • Fairtrade • Energy saving • Hand made