Sentences with phrase «organic chemical compounds»

They honed in on the use of phosphines, which, for the scientifically challenged, are organic chemical compounds containing a phosphorous atom bound to the hydrogen or to the carbon of an organic group, synthesised with functional groups attached.

Chemical oxygen demand (COD)- The quantity of oxygen required for the complete oxidation of organic chemical compounds in water; used as a measure of the level of organic pollutants in natural and waste waters.

Alcohol: The family name of a group of organic chemical compounds composed of carbon, hydrogen, and oxygen.

Vitamins are carbon - comprised organic chemical compounds the body needs to consume for growth, repair, metabolism and overall health.

protein One of many large and complex organic chemical compounds on which life depends.

The researchers, who released their findings in the current issue of the Journal of Functional Foods, suggest that cruciferous vegetables — such as broccoli, brussels sprouts and cabbage — contain an organic chemical compound called indole glucosinolates, which breaks down into other compounds, including indolocarbazole — ICZ — in the stomach.

The researchers designed and synthesized two molecules based on a fragrant organic chemical compound called coumarin.

[12] An organic chemical compound (or related set of compounds) is called a vitamin when it can not be synthesized in sufficient quantities by an organism, and must be obtained from the diet.

Formaldehyde is an organic chemical compound often used with other chemical compounds as a base for polymers.

Not exact matches

All of these scientific hypotheses boil down to first there was an planetary mass covered with water and providing the correct conditions for chemical reactions to create a simple organic compound from which life was formed.

Soy oil is generally separated from flaked soybeans — leaving defatted meal that's ground into flour — using a chemical called hexane, one of the volatile organic compounds that constitutes natural gas, crude oil and gasoline.

Employed on waste water streams, such technologies can achieve up to 99 % COD removal in some types of wastewater (COD, chemical oxygen demand, indicating the amount of organic compounds in water).

This environmentally responsible program improves clients» carbon footprints by reducing chemical use, volatile organic compounds, packaging waste and transportation emissions.

Organic Crib Mattress: As the name implies, such mattresses are made of organic materials, and absent of any chemical and industrial compounds — flame retardants, PBDE, vinyl, polyurethane foam, latex, etc., in the fear of them causing unwanted harm to their occupants.

These volatile organic compounds (VOCs) evaporate into the air, causing chemical fumes that can irritate eyes, nose, and throat as well as trigger headaches.

A study published in the Archives of Environmental Health in 1999, found that disposable diapers release chemicals called volatile organic compounds (VOCs), including toluene, ethylbenzene, xylene and dipentene.

Researchers tested the the foam padding in crib mattresses, and found they release significant amounts of volatile organic compounds (VOCs), potentially harmful chemicals also found in household items such as cleaners and scented sprays.

The village water system in Hoosick Falls was not required to test for the organic and chemical compounds listed by the EPA.

In the 5 June issue of the Journal of the American Chemical Society, a team reports that it has carried out a battery of common organic chemistry reactions using solid compounds, without first dissolving them in the usual solvents.

Three chemists will share the award for developing chemical reactions that enable the building of complex organic compounds with wide applications in medicine, industry and agriculture

Harmful gaseous pollutants in the form of volatile organic compounds are often released into the air when chemicals are used, for example in cleaning products.

HER PROJECT: Stabilizing a fluorescent compound WHAT LED TO THE PROJECT: As the daughter of John Zoltewicz, a longtime professor of organic chemistry at the University of Florida in Gainesville, Susie Zoltewicz grew up hearing about chemical experiments.

In the atmosphere today, particle formation is dominated almost everywhere by mechanisms where at least three chemical components must come together: apart from the two basic substances, i.e. sulphuric acid and water, these are either ammonia or specific organic compounds such as oxidation products from terpenes.

Other guidelines may be found at the relevant society website: for example the American Chemical Society gives standards for the characterization of organic and inorganic molecular compounds.

The organic (carbon - containing) compounds they studied in that patch of Colorado forest play a key role in atmospheric chemical processes that can affect air quality, the health of the ecosystem, and the climate itself.

Turning over rocks across the crater, the rover has compiled evidence of ancient water — a lake fed by rivers once occupied the crater itself — and organic compounds and other chemicals essential for life.

But before life arose, nitrogen fixation must have occurred via purely chemical means: That's because amino acids and nucleic acids, which both contain nitrogen, were likely the organic compounds that developed into Earth's first lifeforms.

Most car - detailing services continue to employ environmentally harmful products such as ammonia, volatile organic compounds and other chemical - based treatments that off - gas harsh pollutants inside the car as well as harm waterways when they are washed down storm drains

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).

Biochemist Lars Thelander at the announcement from the Royal Swedish Academy of Sciences: «Palladium - catalyzed cross-coupling has made it possible to synthesize carbon based molecules, for example, new medicines, agricultural chemicals and organic compounds used in the electronics industry.»

Cold, sluggish Titan has evolved much more slowly, so the dirty orange organic chemicals that tint its surface — most likely dominated by tarry compounds called tholins — could be a deep - freeze model of early Earth.

If you've ever set foot in a nail salon, you've probably smelled volatile organic compounds, chemicals that dissipate rapidly into the surrounding air like acetone and formaldehyde.

Tomato plants produce repellent chemicals called volatile organic compounds in response to herbivore attacks.

Using hydrothermal liquefaction, organic matter such as human waste can be broken down to simpler chemical compounds.

They also correlated the amount of energy found in the sample to its chemical oxygen demand (COD), a commonly used indirect measurement of dissolved organic compounds.

But the data were inconclusive regarding the most intriguing chemicals: complex organic compounds, which are considered a necessary component of life.

Chelators are organic compounds that bind metal ions, and in this case, they also generate «hydroxyl radicals» to break down wood and produce simple building - block chemicals.

Like vehicles and power plants, trees emit airborne chemicals called volatile organic compounds (VOCs), which in the presence of sunlight react with nitrogen oxides in vehicle fumes to form ozone, one of the components in smog that makes it a health threat.

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.

One of the Holy Grails in chemical science has been to find the late - stage, site - specific incorporation of a halogen atom into a complex natural product by replacing an sp ³ C - H bond (one of the most inert chemical bonds known in an organic compound) with a C - X bond (X = halogen).

Chemists at The University of Texas at Arlington have devised a safer, more environmentally friendly, less expensive and more efficient water - based system for the synthesis of organic compounds typically used in pharmaceuticals, agrochemicals, cosmetics, plastics, textiles and household chemicals.

In order to investigate the formation of the extremely low - volatility organic compounds the team has studied five abundant biogenic organic compounds with different chemical structures.

As crude oil burns it releases many toxic chemicals, including lead, carbon monoxide, polycyclic aromatic hydrocarbons and volatile organic compounds, says Bin Jalaludin at the University of New South Wales in Australia.

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.

«Light splits chemicals in the atmosphere, creating more complex organic compounds that make the haze,» said Charnay.

Dirty laundry smells bad because of certain chemicals called volatile organic compounds, which can't always be washed out on an eco-friendly 20 ˚C cycle, according to a new study in the Journal of Chromatography A.

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.

The sensor works by measuring levels of chemicals called volatile organic compounds present in exhaled breath.

They also used chemical analysis of organic compounds in the scales to infer the dinosaur's pigmentation pattern.

The PNNL study measured how, in the atmosphere, these aerosols interact with and mix with other volatile or semi-volatile organic compounds, the carbon - centric chemicals that evaporate from both natural and human - made sources.