Sentences with phrase «of reactive chemicals»

Global warming is implicated in the loss of Arctic ozone because greenhouse gases trap energy lower down, heating up the atmosphere nearer the ground but cooling the stratosphere, creating conditions conducive to the formation of the reactive chemicals that break apart the three - oxygen molecules of ozone.

«The quantities of these reactive chemical species get so high that cells start SNO - ing proteins, like PINK1, that would normally not be SNO - ed,» said Lipton.

Not exact matches

Clean Harbors provides a wide array of Reactive Material Services to ensure secure chemical management and safe disposal of unstable and explosive materials.

The synthetic materials, dyes and chemical gels used for absorbency in disposable diapers can be reactive with sensitive skin, increasing the chance of diaper rash.

The zinc that was present was enriched in the heavier and less - reactive isotopes, which are forms of these elements with different atomic mass but the same chemical properties.

When he became reactive to the almost imperceptible outgassing of chemicals from his own computer, he switched to a Bluetooth keyboard and looked at his computer monitor through the porch window.

Individuals with TILT can become increasingly more reactive over time, until they find themselves responding adversely to the mere whiff or dollop of everyday chemicals — at concentrations far below established toxicity.

In the U.S., the Occupational Safety and Health Administration (OSHA) oversees chemical and other facilities that deal with hazardous materials, making sure various «process safety» routines are followed so as to «prevent or minimize the catastrophic injury or death that could result from an accidental or purposeful release of toxic, reactive, flammable or explosive chemicals.»

In this case, he was testing the idea that a buildup of cellular damage caused by oxidation — technically, the chemical removal of electrons from a molecule by highly reactive compounds, such as free radicals — is the main mechanism behind aging.

As each carbonate species reacts differently when diffusing or flowing through water, the researchers characterized each reaction, then worked each reaction into a reactive diffusion model — a simulation of chemical reactions as carbon dioxide flows through a briny, rocky environment.

Greenpeace reports that in three cases bromine was present in more than one percent of the total surface chemical composition of the material tested, prompting the environmental organization to conclude that there was «continued widespread use of either additive or reactive brominated flame retardants.»

It belongs to a group of chemicals called reactive oxygen species (ROS), which scientists suspect to have a damaging effect on cells and their components.

The researchers don't yet know the exact chemical reactions that produce the free radicals, but the work «quite solidly establishes a new role for reactive oxygen in development,» says ageing researcher Karl - Heinz Krause of the University of Geneva in Switzerland.

At TU Wien (Vienna), it has become possible to control one of the most important chemical processes: switching oxygen molecules between a reactive and unreactive state.

Photodynamic therapy (PDT), involves the use of chemicals called photosensitizers that are activated by exposure to specific wavelengths of light to release reactive molecules that can damage nearby cells.

It has many of the same chemical properties as ATP but is more reactive so no enzymes would be needed.

High glycolytic activity leads to accumulation of toxic reactive oxygen species (ROS), as does rapid manufacture of mitochondria, which tend to leak the same chemicals.

That's the conclusion of two independent studies that indirectly tracked concentrations of hydroxyl, a highly reactive chemical that rips methane molecules apart.

In a third study published online by Science on 6 April (www.sciencexpress.org), molecular geneticist Valter Longo of the University of Southern California in Los Angeles and colleagues battered a population of yeast mutants with heat or paraquat, a chemical that creates reactive oxygen molecules.

Through a series of models and experiments, she has demonstrated that ultraviolet radiation can break chemical bonds and split molecules into highly reactive fragments called radicals.

Consequently, massive amounts of reactive gases such as oxygen, hydrogen, and methane are continually being added to Earth's now «anomalous» atmosphere faster than they would otherwise be removed by inorganic chemical processes.

Berkemeier, T., S.S. Steimer, U. K. Krieger, T. Peter, U. Pöschl, M. Ammann, and M. Shiraiwa: Ozone uptake on glassy, semi-solid and liquid organic matter and the role of reactive oxygen intermediates in atmospheric aerosol chemistry, Physical Chemistry Chemical Physics 18 (18), 12662 - 12674, 2016.

reactive (in chemistry) The tendency of a substance to take part in a chemical process, known as a reaction, that leads to new chemicals or changes in existing chemicals.

«Some imaging studies using mouse models of Alzheimer's disease had revealed the presence in these mice's brains of tiny, mysterious black dots that could signal the presence of iron, an element that shows up dark under MRI and, in certain chemical forms, can be highly reactive and inflammation - inducing,» Rutt said.

Undoubtedly, chemical processing of halogens into reactive forms has taken place and the Arctic is primed for ozone depletion.

Although underlying mechanisms of endocrine disruption through chemicals in humans are still unclear, the peroxisome proliferator - activated receptors (PPARs) and reactive oxygen species are yet suspected to play a major role (183).

Platinum is a highly reactive and in - demand catalyst across the chemical and energy industries, but a team of University of Wisconsin — Madison and Georgia Institute of Technology scientists could reduce the world's dependence on this scarce and expensive metal.

«Chemical Analysis of Complex Organic Mixtures Using Reactive Nanospray Desorption Electrospray Ionization Mass Spectrometry.»

«Because nano - DESI already meets this trio of requirements in passive mode, the reactive mode is another valuable tool in understanding the complex chemical world around us,» said Dr. Alexander Laskin, an EMSL scientist who conducted numerous experiments using the reactive nano - DESI approach.

«Past studies have shown that having low antioxidant levels and increased reactive oxygen species — chemical products that bind to body cells and cause damage — is related to more severe PAD,» said Matthew Muller, postdoctoral fellow in Larry Sinoway's lab at Penn State College of Medicine, and lead author of the study.

Not only will stainless steel thermoses retain temperatures for long periods of time, but, more important, they will not leach unwanted chemicals as do the more reactive plastic varieties.

What stood out to me was that I came up reactive to two chemicals that are kind of like close cousins: salicylic acid and benzoic acid.

Instead, researchers measure a variety of inflammatory chemical markers in the blood or tissue, notably interleukin - 6, tumor necrosis factor (TNF), C - reactive protein, prostaglandins, and leukotrienes.

Concentrations of inflammatory chemicals like tumour necrosis factor - alpha (TNF - a) fell, as did thiobarbituric acid reactive substances, a family of free radicals.

Many ME / CFS patients report being unusually reactive to a variety of environmental substances — toxic mold, gluten, household chemicals, hazardous algae blooms, pesticides, EMF's, mercury and many others.

Genetic damage can occur because of thermal changes, radiation, viruses or the presence of highly reactive chemicals.

In particular, consuming sunflower seeds more than five times per week was associated with reduced levels of C - reactive protein (CRP), a key chemical involved in inflammation.

STUDY ONE — scientists fed a hydro - alcoholic extract of nettle to 50 male and female diabetics, and after 8 weeks, the pro-inflammatory chemical interleukin 6 fell, as did c - reactive protein.

A study of 20 people with type 2 diabetes found that eating 37 grams of chia seeds per day for 12 weeks reduced blood pressure and levels of several inflammatory chemicals, including C - reactive protein (CRP)(22).

The chemical structure of polyunsaturated oils is such that there are unpaired electrons for every carbon - carbon double bond which are highly reactive if heated or processed in any way.

With gasses, reactive chemicals, flammable products, and more just waiting to explode, it wouldn't be a wonder that the employee of the Pharmaceutical Industry feels like a bull in a china shop.

The chemical engineering curriculum and program structure is designed to provide students with thorough knowledge of energy and material balances, thermodynamics, and the physical and reactive characteristics of chemical structures, in order to facilitate creative design and analysis of chemical and nuclear systems.

Undoubtedly, chemical processing of halogens into reactive forms has taken place and the Arctic is primed for ozone depletion.

Chemical reactions on the surfaces of these particles can rapidly convert halogens into very reactive forms.

Destruction of ozone in the stratosphere takes place as quickly as formation of ozone, because the chemical is so reactive.

Sudden stratospheric warming can significantly alter temperature - dependent chemical reactions of ozone and other reactive gases in the stratosphere and affect the development of such features as «ozone holes.»

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.

«Periodic» is often used to describe systems that have two reactive (where the response is out of phase with the forcing) components; inductor and capacitor in electronics, mass and spring in mechanical clocks, chemical bond and atomic mass in greenhouse gases, gas density and compressibility in sound.

For example, early global chemical modelling results argued that global tropospheric ozone, a greenhouse gas, was controlled by emissions of the highly reactive gases nitrogen oxides (NOx), carbon monoxide (CO) and non-methane hydrocarbons (NMHC, also known as volatile organic compounds, VOC).

Hair Colorists change the color of their clients» hair using reactive chemicals.