Sentences with word «isoprene»

Researchers determined that previous assumptions about nitrogen oxide levels were overly simplistic; the amount of SOA produced from isoprene released by trees as well as the SOA volatility are more accurately tied to interactions with electron - rich, carbon - based chemicals, known as organic peroxy radicals, that compete with nitrogen oxides in reactions.

Researchers found that the volatility and oxidation state of isoprene SOA are sensitive to, and exhibit a nonlinear dependence on, NOx levels.

Breath measurements taken from volunteers throughout the day allowed researchers to track changes in isoprene levels following activities such as exercise or eating.

To help address this challenge, a team of U.S. Department of Energy researchers conducted laboratory experiments in an environmental chamber to investigate the effects of NOx on the volatility and chemical composition of SOA generated by isoprene photooxidation.

Tohoku University scientists explained how their device works in the journal Sensors, using isoprene as an example.

This observation helps reconcile the seemingly contradictory observations of the NOx effect on isoprene SOA volatility reported in previous literature studies.

Certain trees and shrubs emit isoprene into the atmosphere.

Cellulose gum, Styrene Isoprene Styrene Block Copolymer, Polysobutylene, Petroleum Resin, Polyurethane Film, Liquid Paraffin, Tetrakis Methane

But as you may know, I am talking about the rising leading edges of AOT plots which relate to early stage cloud formation (i.e. nucleation — presumably via DMS, isoprenes etc emitting by cyanobacterial blooming).

Although biogenic NMVOC emissions increase with increasing temperature, all three studies concur that climate - driven changes in vegetation types unfavourable to isoprene emissions (notably the recession of tropical forests) would partly compensate for the effect of warming in terms of ozone generation.

In polluted environments increased temperatures and larger temperature - sensitive emissions of isoprene cause enhanced ozone levels.

When isoprene is in the presence of human - made sulfate particles it transforms into atmospheric organic aerosol particles.

«Effect of Organic Coatings, Humidity and Aerosol Acidity on Multiphase Chemistry of Isoprene Epoxydiols.»

June 28, 2016 — Dogs could help protect type 1 diabetes patients against dangerous drops in blood sugar levels (hypoglycemia), according to researchers.They believe dogs can detect higher levels of a chemical called isoprene in the breath of diabetes patients... Read more

«Concerns about climate change and energy security are driving an aggressive expansion of bioenergy crop production and many of these plant species emit more isoprene than the traditional crops they are replacing,» the paper states.

When asked about how potential isoprene pollution would compare to offsetting burning some fossil fuels, the study's co-author, Nick Hewitt, told the Guardian, «We're not in a position to make that comparison.»

Run at year 2030 (SSTs as in # 1), 4 year runs (+2 - month initialization), model's own distribution of given emission scaled uniformly: 2.1: +100 Tg / yr isoprene (scale existing source to add 100 Tg / yr).

«Isoprene photo - oxidation products quantify the effect of pollution on hydroxyl radicals over Amazonia.»

According to our present - day model simulations, isoprene oxidation produces 4.6 Tg SOA / yr, that is less than half of the 12.2 Tg SOA / yr formed by the oxidation of other BVOC.

What's more, kudzu is also a prolific emitter of the biological hydrocarbon isoprene, another chemical implicated in ozone production.

The researchers made the printed batteries flexible and stretchable by incorporating a hyper - elastic polymer material made from isoprene, one of the main ingredients in rubber, and polystyrene, a resin - like component.

CREAM EYESHADOW INGREDIENTS (Date 2 Enhance, Disco 1 Prime): Mica, Caprylic / Capric Triglyceride, Talc, Hydrogenated Polydecene, Paraffinum Liquidum (Mineral Oil), Zinc Stearate, Silica, Hydrogenated Styrene / Isoprene Copolymer, Coco - Caprylate / Caprate, Sorbic Acid, Sodium Dehydroacetate, Tocopherol, Hoya Lacunosa Flower Extract, Tin Oxide, [May Contain / Peut Contenir (+ / --RRB-: Iron Oxides (Ci 77491, Ci 77492, Ci 77499), Titanium Dioxide (Ci 77891), Aluminum Powder (Ci 77000)-RSB-

Beyond the health effects, the acidity of the particles affects other aspect of atmospheric chemistry, including the reaction of isoprene, a natural hydrocarbon produced by trees in forests of many kinds, and the solubility of metals found in mineral dust.

SOA produced by isoprene is estimated to almost triple, whereas the production from other BVOC more than triples.

Analyses of the ground and aircraft data performed by Setyan et al. (2012), Shilling et al. (2013), and Kleinman et al. (2016) showed that organic aerosol production increased when human - caused emissions from Sacramento mixed with air rich in isoprene, an organic compound wafting from many plants that originate in the area's foothills.

Isoprene is a known indicator of cholesterol synthesis and could offer valuable insights into a patient's metabolism.

Dr Margaret O'Hara, from the Molecular Physics Group and primary investigator on the project, said: «Previous studies have found potential biomarkers for liver disease, such as isoprene and acetone, but they are not specific enough because they are possible biomarkers for other diseases or can arise from numerous normal metabolic processes.

Isoprene, an organic compound produced and emitted into the atmosphere by many tree species, plays an important role in tropospheric ozone chemistry and in formation of SOA particles.

On the other hand, β - pinene, myrcene and isoprene, produce much less ELVOC's, which are an important biogenic sources for the formation of particles in the atmosphere,» emphasizes Dr. Torsten Berndt of TROPOS, who was involved in all three publications.

In the experiments, five biogenic organic gases (limonene, α - pinene, β - pinene, myrcene and isoprene) were passed through the laminar flow tube and then examined by a CI - APi - TOF mass spectrometer.

Additional aerosol mass composed of organosulfate and organonitrate chemicals can then form via nitrogen oxide - initiated oxidation of VOCs from natural vegetation (e.g., isoprene) in the presence of highly acidic ultrafine particles.

[1] For example, it has been demonstrated that blends of 2 linear triblock polymers poly (isoprene)- block - poly (styrene)- poly (2 - vinylpiridine) leads to an ordered array of rectangular - shaped cylinders with 4-fold symmetry in bulk, which could be very interesting for surface nanopatterning if prepared in the form of thin films.

The team found that IEPOX is a major player in producing aerosols from isoprene and that particle size, certain coatings, and acidity influence how IEPOX behaves.

At Pacific Northwest National Laboratory, Dr. Alla Zelenyuk and her team took on a specific part of that haze: originated from isoprene.

After being released by the trees and shrubs, isoprene reacts in the atmosphere and becomes assorted chemicals, including IEPOX (isoprene epoxydiols).

Isoprene is a precursor to ozone, which as a ground - level pollutant is believed to cause many health - problems especially among the vulnerable, including premature death.

Effects of anthropogenic emissions on aerosol formation from isoprene and monoterpenes in the southeastern United States

The most important global ozone precursors are CH4 and isoprene.

In the future, nitrate radicals and ozone become more important than nowadays, but remain minor oxidants for both isoprene and aromatics.

The new report, published in the Proceedings of the National Academy of Sciences, details how kudzu releases nitric oxide and isoprene, which are important in making ozone.