Sentences with phrase «inert chemicals»

«They were once thought to be inert chemicals, made of essentially indestructible bonds.

However, at the other end of the scale, excessive exposure to sunlight does not result in vitamin D overdose, because previtamin D3 and vitamin D3 are photolyzed to biologically inert chemicals before they can build up to dangerous levels.

We currently have little idea how even simple life could have evolved from inert chemicals, so we must not get...

Their demotion to inert chemicals came after 1935, when Wendell M. Stanley and his colleagues, at what is now the Rockefeller University in New York City, crystallized a virus — tobacco mosaic virus — for the fi rst time.

He reminds us that science is still ignorant of the chemical pathways that wonderfully allowed the inert chemicals of the earth's early history to form the more complex chemicals needed by even the simplest living organisms.

The invention of synthetic fertilizer, where nitrogen is taken from an inert chemical form in the air and turned into ammonia, has had a profound effect on nitrogen cycling.

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).

The earth's atmosphere is an inert chemical system made up of half a dozen chemical compounds.

Not exact matches

Tyvek ® brand materials are inherently water resistant, inert to most organic and inorganic chemicals and stand up to mishandling and abuse.

The Little Spruce Organics website states that polyurethane laminate is an inert material, so in order for it to release harmful chemicals it would need to be heated to extremely high temperatures, so most cloth diaper covers are considered «safe.»

This sippy bottle is made from aluminum and has a completely inert, water - based epoxy lining that does not leach harmful chemicals.

A study in the journal Chemical Research in Toxicology finds that mercury on the surface of dental fillings slowly turns to an inert sulfide compound, which should keep the mercury from harming the nervous system.

It's also very inert and won't degrade and release chemicals at high temperatures like some non-stick materials.

The team also found that N - methyl -2-pyrrolidone (NMP)-- an inert, or inactive, chemical commonly used as a pesticide additive — is highly toxic to honeybee larvae.

Helium is a chemical element that has the symbol He, is colorless, odorless, tasteless, non-toxic, and nearly inert monatomic that heads the noble gas series in the periodic table.

«The main sticking point, however, is the catalyst — a compound needed to drive the reaction because CO2 is usually a very inert or unreactive chemical.»

And researchers have long known that, despite its reputation as an inert metal, gold nanoparticles can work as a catalyst to speed chemical reaction.

And in the 1980s scientists trying to make new chemicals produced the molecule argonium (36ArH +), a strange compound not normally found on Earth that combines hydrogen with the generally inert gas argon.

First, the rocks would be placed inside a sealed container filled with pressurized nitrogen, an inert gas that prevents chemical activity.

Platinum and its congeners, while certainly not being the «inert and noble» metals they were once considered, are left standing by the range of chemical properties and reactions of iron.

The borosilicate glass that forms most chemical vessels is inert and hugely durable, so you can heat, cool and react the brews within knowing the glass won't explode, deform or interfere with the reaction.

Halas, Rice's Stanley C. Moore Professor of Electrical and Computer Engineering and professor of chemistry, bioengineering, physics and astronomy, and materials science and nanoengineering, said hot electrons are particularly interesting for solar - energy applications because they can be used to create devices that produce direct current or to drive chemical reactions on otherwise inert metal surfaces.

Because the process developed by Mativetsky avoids the use of harmful chemicals, high temperatures or inert gas atmospheres, his work represents a promising step towards environmentally - friendly manufacturing with graphene oxide.

Although silica is usually chemically inert — it is chemically identical to ordinary sand — Morihara says that, by retaining the imprint of a molecule which has been resting on its surface, it is able to deter - mine the course of a reaction (Journal of the Chemical Society Chemical Communications, 1992, p 358).

The list of chemicals targeted by EDSP includes about 1,000 active ingredients in pesticides, 5,000 inert ingredients in pesticides, and 6,000 drinking water contaminants, with some overlap between the lists of pesticides and drinking water contaminants.

«It may be possible to modify industrially promising chemicals to biologically inert forms that can't be activated.»

Likewise, I will address the confinement effect exerted by molecular sieves, solvents, nano - structured materials or an inert gas matrix over the chemical reactions, which are important for chemical catalysis.

What seems like an inert and harmless thing, a soft pillowtop mattress, is often a source of exposure to harsh chemicals, EMFs amplified by innersprings, and other problems.

I also found that both IntelliBED mattresses and most major organic mattress brands were safe and inert on a chemical level but that the non-toxic IntelliBED was more durable.

And who expected the most inert of chemicals (according to my sixties - era high school science books)-- the CFCs — would eat the ozone layer?

Now, if you establish a pyrolysis program to go with expanded tree farming, you can convert perhaps 50 % of the trapped carbon into inert charcoal while getting a distillate of chemicals to be refined for drugs, cosmetics, etc..

These messes should be going to pyrolysis plants to get some inert charcoal and energy and a mix of organic chemicals that can be refined for a fuel or making drugs.

The «Fuels of Freedom» are non-toxic, chemically inert but readily react with oxygen, halogens and several other highly reactive chemicals such as ozone, noncorrosive, highly portable, and can be stored indefinitely in sealed containers (e.g., steel drums) and under an inert atmosphere (e.g., nitrogen) in large tanks.

We used observations of inert and radioactive chemical constituents («tracers») to estimate the rates at which the ocean transports material from the surface to the interior.

FILE - In this Jan. 29, 2015, file photo, a remotely controlled robot handles an inert simulated chemical munition during training at the Pueblo Chemical Depot in southern Cchemical munition during training at the Pueblo Chemical Depot in southern CChemical Depot in southern Colorado.