Sentences with phrase «of organic reactions»
The vast majority of organic reactions today require organic solvents, many of which are environmentally hazardous and costly to dispose of.
http://www.sciencemag.org/ Not exact matches
The gasification process takes organic, carbonaceous materials and transforms them into efficient synthetic gas through a series of chemical reactions held at high temperatures.
sam stone Given we are made in the image of God our core «DNA» (as evidenced by 98 % of the world population) knows there is more to this existence than chemical reaction on organic matter.
Belief in the existence of a personal God has declined as men have found the influence of mutually relative natural agencies, — environment, natural selection, organic composition, conditioned functional reaction etc., able to account for natural phenomena that before were related to more general causes or even to the First Cause.
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.
Neo-Platonism blossomed in the eighth century as a reaction against the Newtonian world - machine of the Enlightenment, and was especially popular among embryologists, who sought an inner Law of Development to explain organic forms.
I used to recoil at the premium price of organic poultry, but my reaction changed once I cooked a Rosie chicken (certified organic, free range chicken from Petaluma Poultry - link), and tasted the difference a good upbringing makes.
Every new attempt at reintroducing grocery store organic cows milk seems to create more severe of a reaction each time.
Caryn Hartglass: I know that some of the reactions when people hear this is why should I bother buying organic if I can't be certain that it is organic?
Some of the US organic tomato sauce is not following guidelines and you have an instant reaction when you consume them.
Organic baby carriers are made out of 100 % organic material — usually cotton, but not always — and are designed to keep your child's skin protected from any harsh chemicals or man - made products that could cause an allergic reaction.
Our organic cotton baby clothes are eco-friendly, chemical - free with none of the «off gassing» results of non-organic clothing that are harmful to the environment, making them a natural, healthy choice for your baby and minimizing possible allergic reactions.
«Having a positive eating experience with a variety of foods, testing for allergic reactions and advancing textures are the most important parts of early feeding, not whether they're getting organic or not,» Hays says.
Look for organic - based toothpastes, so you won't have to worry about the risk of reactions or rashes.
The softness of the pillow comes in part from its high - quality, 100 % organic cotton fabric; additionally, a hypoallergenic polyester filling decreases the risk that sensitive babies will have an adverse skin reaction to the pillow.
The simpler organic baby skin products are, the less likely your child will have a reaction to any of the ingredients.
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
But the process still required dangerous organic solvents, and recovering the reaction products from the mix of solvent and catalyst required turning up the heat to distill the solvent, a treatment that could destroy the catalyst.
Scientists assumed that a nonbiological reaction had caused Levin's instruments to register life, and the lack of organics seemed to seal the deal.
«My training is in reaction mechanisms,» explains Keith Brown, who earned a Ph.D. in organic chemistry from the University of Liverpool and has been working at Clairol for 28 years.
Toyohashi University of Technology researchers led by Associate Professor Shibatomi developed new catalytic reaction to produce chlorine - containing organic molecules in isomerically pure (left - or right - handed) form
«It is a thrilling possibility that this influx of dust on the surfaces of solar system bodies has acted as a continuous rainfall of little reaction vessels containing both the water and organics needed for the eventual origin of life.»
It also has a similar structure to some other organic weak bases that have been used to catalyze the type of chemical reaction needed to form these gels — the formation of ester bonds to create a polyester.
«This latest finding provides a concise and direct synthesis pathway that, due to the structure of the products delivered, will likely be quite valuable for the discovery and development of therapeutic agents,» says Micalizio, whose work focuses on the design of organic chemical reaction methods and strategies to improve medicine and human health.
Investigators have said a chemical reaction between nitrate salts and organic kitty litter used as an absorbent created sufficient heat to melt seals on at least one drum of contaminated sludge, which had originated at the Lost Alamos lab near Santa Fe.
Nucleophilic substitution reactions play an important role in the formation of organic compounds.
The Grignard reaction is a classic reaction in organic chemistry, useful for building the carbon skeleton of molecules by transforming carbon - halogen bonds into carbon - carbon bonds.
At Osaka University, a team of organic chemists has now developed and enhanced a chemical reaction that allows controlled transformations of one of the toughest chemical bonds.
«It eliminates organic solvents from the reaction medium, requires little to no energy input — and now, it reduces the cost and extends the lifetime of an endangered precious metal, palladium.»
In a new paper published in the journal Science, a UC Santa Barbara organic chemistry team led by Bruce Lipshutz shows how they tweaked the recipe for an ecofriendly and less expensive version of a metal - based chemical reaction that is essential in the manufacture of several pharmaceuticals.
Vinylidene - acetylene isomerization is the prototypical example of a 1,2 - hydrogen shift, one of the most important classes of isomerization reactions in organic chemistry.
«We had reported a new catalytic reaction in December 2013, to rapidly synthesize triarylmethanes in 3 steps from readily available starting materials, using a palladium catalyst,» says Masakazu Nambo, an organic chemist and another leader of this study.
The scientists investigated a chemical reaction that involved breaking carbon - to - iodine bonds in the organic molecule iodobenzene, by means of metallic copper, a common catalyst.
Meyer, a chemist at University of North Carolina at Chapel Hill and director of its Energy Frontier Research Center in Solar Fuels, noticed that two separate groups of researchers working on two separate parts of the photosynthetic reaction happened to be using the same class of catalyst — ones with an atom of the metal ruthenium surrounded by organic molecules.
Transmetalation normally involves a reaction done in organic chemistry in which the substitution of metal ions generates new metal - carbon bonds for use in catalytic systems and to synthesize new metal complexes.
During his years as an assistant professor of chemistry at University of Maryland, Baltimore County, Dietze asked fundamental questions about mechanisms of basic organic chemical reactions, questions he recounted in a recent telephone interview: «How does A go to B?
Current fabrication techniques include organic solution - phase synthesis, thermolysis of organometallic precursors, sol - gel processes, hydrothermal reactions and biomimetic or dendrimer templating.
The nc - AFM microscopy provided striking visual confirmation of the mechanisms that underlie these synthetic organic chemical reactions, and the unexpected results reinforced the promise of this powerful new method for building advanced nanoscale electronic devices from the bottom up.
Normally during such reactions, multiple organic molecules will attach to each metal ion, so a relatively small amount of nickel should have been needed.
«Nobody has ever taken direct, single - bond - resolved images of individual molecules, right before and immediately after a complex organic reaction,» Fischer says.
The dependence likely arises from gas - phase chemistry of organic peroxy radicals, which compete with NOx in reactions, and succeeding particle - phase reactions.
Those reactions weave the simple atoms of hydrogen, carbon, and oxygen into complex organic molecules.
«Our next goal is to utilize such structurally simple, inexpensive manganese catalysts to target other types of reactions in which CO2 and hydrogen can be converted into useful organic chemicals,» concluded Prof. Khusnutdinova.
The presence of boron tells us that, if organics were present on Mars, these chemical reactions could have occurred.»
«This strategy of exploiting the effective condensation reaction to synthesize organic frameworks with high uptake capacity and high physiochemical stabilities hold huge promise for practical applications.»
Shiraiwa, M., Pfrang, C., Koop, T., and Pöschl, U.: Kinetic multilayer model of gas - particle interactions in aerosols and clouds (KM - GAP): linking condensation, evaporation and chemical reactions of organics, oxidants and water, Atmospheric Chemistry and Physics, 12, 2777 - 2794, 2012.
They make sure of a synthetic approach to produce a 3D porous organic network in liquid - phase reactions in the presence of suitable solvents and / or catalysts.
While other species detected in space are formed by gas - phase chemistry alone, or by a combination of both gas and solid - phase generation, methanol is a complex organic compound which is formed solely in the ice phase via surface reactions on dust grains.
The process has two main phases: the light - dependent light reaction responsible for the initial capture of energy, and the light - independent dark reaction in which this energy is stored in the chemical bonds of organic molecules.