Navigation Links
Study improves accuracy of models for predicting ozone levels in urban areas
Date:11/1/2010

itrogen dioxide combine to form this end product. "This reaction, which slows down ozone production, has been among the greatest sources of uncertainty in predicting ozone levels," said Mitchio Okumura of the California Institute of Technology--a member of the research team. This uncertainty has affected computer models that simulate air pollution chemistry.

An experimental challenge

Why is there so much uncertainty about the speed or rate of formation of nitric acid? In large part, because instead of combining to form a stable form of nitric acid, a hydroxyl radical may combine with nitrogen dioxide to form a less stable form of nitric acid (HOONO)--a snake-like molecule that quickly breaks apart in the atmosphere. This breakdown of the unstable form of nitric acid releases its hydroxyl radical back into the atmosphere where it may once again become available to form ozone; this breakdown therefore speeds the formation of ozone. Nevertheless questions about the existence, amount, speed and formation of the unstable form of nitric acid have, until now, complicated measurements of the speed or rate of the formation of the more stable form of nitric acid.

But through experiments conducted at the Jet Propulsion Laboratory (JPL) and at the California Institute of Technology using state-of-the-art techniques, Okumura and his colleague, Stanley P. Sander at JPL, led a team of researchers that accurately measured: 1) the overall speed at which hydroxyl radicals and nitrogen dioxide combine, or react, in given atmospheric conditions; 2) the ratio of stable nitric acid to unstable nitric acid that is formed under given atmospheric conditions.

In addition, new laser methods enabled researchers to directly detect the presence of the unstable form of nitric acid in microseconds. And with the help of companion calculations performed at Ohio State by Anne McCoy, they could quantify its yield as soon as it was formed.

The resear
'/>"/>

Contact: Lily Whiteman
lwhitema@nsf.gov
703-292-8310
National Science Foundation
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Long-term study shows effect of climate change on animal diversity
2. £2 million study to reveal workings of dementia genes
3. New study looks to define evangelicals and how they affect polling
4. CU-Boulder study suggests air quality regulations miss key pollutants
5. Researchers study acoustic communication in deep-sea fish
6. Study reveals homeowner perceptions in fire-prone areas
7. Researchers study how pistachios may improve heart health
8. Study: urban black bears live fast, die young
9. New study indicates link between weight gains during pregnancy and dieting history
10. Study reveals specific gene in adolescent men with delinquent peers
11. Sweat it out: UH study examines ability of sweat patches to monitor bone loss
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... burning in eastern New South Wales, Australia when NASA,s ... 03:35 UTC on July 11 (12:35 p.m. local time/11:35 ... eastern New South Wales (NSW), the Moderate Resolution Imaging ... the region and spotted smoke (light brown) from various ... are outlined in red. , The New South Wales, ...
(Date:7/11/2014)... scientists have set a "mouse TRAP" to capture the ... recent study published in the Journal of Clinical ... technique called TRAP to extract cellular and genetic information ... scientists at the Rockefeller Institute for Medical Research in ... protein-making machinery, or ribosomes, of the cell type of ...
(Date:7/11/2014)... team of researchers, including scientists from the Max Planck ... reported a major step in understanding photosynthesis, the process ... the oxygen in its atmosphere and which is therefore ... , The researchers report the first direct visualization ... the step in which a specific protein complex, photosystem ...
Breaking Biology News(10 mins):A first direct glimpse of photosynthesis in action 2
... common condition affecting 12-20 percent of Americans age 65 ... heart attack and strokeand many with the disease may ... Interventional Radiology. For more than a decade, the ... Life, has helped identify this very serious and potentially ...
... , This press release is available in German . ... as defined by the EU Water Framework Directive is unlikely to ... a study in which data from the four largest rivers in ... analysed over ten years. The study was carried out by the ...
... Agriculture (USDA) aerial photography survey of 38,000 wildfire-burned acres ... first evidence that the invasive leafy spurge weed is ... Booth, a rangeland specialist with the Agricultural Research Service ... the survey using a technique he developed called Very ...
Cached Biology News:Interventional radiologists: Learn about peripheral arterial disease and get moving 2Interventional radiologists: Learn about peripheral arterial disease and get moving 3Poor outlook for water quality in Germany 2Digital cameras open new view of America's West 2
(Date:7/11/2014)... July 11, 2014 Research and Markets ... Technology Market - Global Industry Analysis, Size, Share, Growth, ... offering. http://photos.prnewswire.com/prnh/20130307/600769 ... acids (either DNA or RNA) into cells. This technology ... cancer cells and protein metabolism by affecting the nuclear ...
(Date:7/11/2014)... July 11, 2014 Cayenne Medical, ... specializing in the soft tissue reconstruction segment, announced ... System for surgeries involving the shoulder and extremities. ... a novel, inserter-controlled deployment method. The unique delivery ... deployment, anchor pull-out, or anchor displacement (also commonly ...
(Date:7/10/2014)... July 10, 2014 Terascala, the industry ... that Alan Swahn, a former vice president of product ... as vice president of marketing. Terascala’s software when combined ... NetApp create the highest performance and most reliable solutions ... to guide Terascala’s channel expansion and broaden its product ...
(Date:7/10/2014)... Senior supply chain management executives from over ... challenges of “Reducing Cost, Lead Time, & Defects in ... Describing the partnership of the Bio Supply Management Alliance ... ( SCMI) of the University of San Diego ... Kroc Institute of Peace and Justice in San Diego, ...
Breaking Biology Technology:International Transfection Technology Market - Industry Analysis, Size, Share, Growth, Trends and Forecast to 2019 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 3Terascala Expands Executive Team 2Terascala Expands Executive Team 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4
... , Collaboration with Biomodels facilitates development ... Sept. 16 Avaxia Biologics, Inc., a biotechnology company developing oral ... that it has been awarded a Phase I SBIR grant from ... development of a novel antibody therapeutic for oral mucositis. , ...
... Sealers, cleaners, and ... , ... 16, 2009 - Tile Media Properties (TMP), best known for The Tile Doctor brand and ... The 10 year-old Atlanta-based company receives millions of unique visitors annually and is well-recognized as ...
... DIEGO, Sept. 16 Orexigen(R) Therapeutics, Inc. (Nasdaq: OREX ), a ... will be speaking at the UBS Global Life Sciences Conference. The details ... September 22, 2009, Time: 2:30pm Eastern, ... Graham Cooper, Chief Financial Officer, , , ...
Cached Biology Technology:Avaxia Biologics Awarded Phase I SBIR Grant to Develop Antibody Therapeutic for Oral Mucositis 2Avaxia Biologics Awarded Phase I SBIR Grant to Develop Antibody Therapeutic for Oral Mucositis 3The Tile Doctor Launches Inaugural Product Line 2The Tile Doctor Launches Inaugural Product Line 3
... Green II RNA gel stain is ... has bright fluorescence when bound to RNA ... ideal for use with either formaldehyde/agarose or ... UV transilluminators. A 500 µL unit size ...
... SYBR Green II RNA gel stain ... has bright fluorescence when bound to RNA and ... use with either formaldehyde/agarose or polyacrylamide gels using ... stains 100 minigels. A 500 µL unit size ...
... EIA Principle: Glutathion-S-transferases (GST) ... are involved in the detoxification processes. ... subgroups: Alpha, Mu, Pi, Teta and ... physiochemical, immunological, enzymatic and s Sample ...
... Microarrays designed for RNA aptamer screening and ... and powerful Paraflo microfluidic on-chip synthesis platform. ... our comprehensive DNA/RNA Aptamer Microarray Service. ... RNA Aptamer Microarray contains greater than 1500 ...
Biology Products: