HOME >> BIOLOGY >> NEWS
Research Answers Burning Questions About Pollution

that excess energy in the form of light a process called fluorescence. Optical detectors then pick up that light, and a computer analyzes its wavelength and intensity to tell the researchers what type and quantities of molecules are present in the flame.

Laurendeau says this technique is very effective for learning about the combustion process, but he and his students had to overcome several challenges to make it work.

"The fluoresced light can be garbled by light from other sources," Laurendeau explains. "For example, the liquid fuel droplets reflect and scatter the laser light, which gives you a giant background signal that has to be separated out from the real signal you want to see. Also, there's a problem called 'quenching,' where the pollutant molecules lose their energy not by fluorescing light, but just by bumping into one another, which you also have to correct for."

Laurendeau and his students developed a method to compensate for the quenching called laser-saturated fluorescence.

"Basically, we take a measurement in two parts," he explains. "First, we shine the laser on the flame to obtain a 'signal' from the fluorescing nitric oxide. But that reading also contains a lot of background noise. We then change the wavelength of the laser so that we don't get a signal from the nitric oxide we're just measuring background. After we have all the data, we subtract the background noise out, and we're left with just nitric oxide measurements. The whole thing can be done in an afternoon."

Laurendeau also is experimenting with putting a special filter in front of the detector that could get rid of the background noise altogether.

When Laurendeau started his flame experiments in the early 1980s, little funding was available because no one yet knew whether it would work and there were no immediate practical ap
'"/>

Contact: Amanda Siegfried
amanda_siegfried@uns.purdue.edu
765-494-4709
Purdue University
17-Sep-1998


Page: 1 2 3 4 5

Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Schepens Eye Research Institute receives Roadmap grant to develop center for curing eye diseases
4. Researchers identify protein promoting vascular tumor growth
5. Researchers devise potent new tools to curb ivory poaching
6. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
7. Researchers ID chlorophyll-regulating gene
8. Environmental issues center of Inland Northwest Research Alliance 4th Annual Symposium
9. Research suggests new avenue for stopping, preventing colon cancer
10. Researchers develop fast track way to discover how cells are regulated
11. Research on carbohydrate metabolism receives historical recognition

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Research Answers Burning Questions About Pollution

(Date:10/15/2014)... the 44th Rosenstiel Award for Distinguished Work in Biomedical ... the mechanisms of genomic instability and its implications for ... second alumnus to win the Rosenstiel Award; the first, ... Alt is the Charles A. Janeway Professor of Pediatrics ... an investigator at the Howard Hughes Medical Institute at ...
(Date:10/14/2014)... – Scientists have sequenced the house fly genome for ... might expect from an insect that thrives in pathogen-rich ... Oct. 14 in the journal Genome Biology , ... and of how flies quickly adapt to resist insecticides, ... house flies (Musca domestica) carry and transmit more than ...
(Date:10/14/2014)... of scientists led by researchers at the University ... of Miami Miller School of Medicine (UMMSM) have ... underlying bipolar (manic depressive) disorder, a breakthrough that ... affective disorder, as well as depression and other ... online this week in Nature Molecular Psychiatry ...
Breaking Biology News(10 mins):Brandeis awards 44th Rosenstiel Award to pioneering geneticist Fred Alt 2House fly genome reveals expanded immune system 2Rare genetic disease protects against bipolar disorder 2Rare genetic disease protects against bipolar disorder 3
(Date:10/19/2014)... Asian Automatic patient billing report defines and segments the ... The Automatic patient billing market in Asia is estimated ... a developing CAGR of 7.2% from 2013 to 2018. ... patient billing market, to get an idea of the ... the segmentation of this market in the same region, ...
(Date:10/19/2014)... The Asian Orthopedic braces and support systems report defines ... forecast of revenue. The Orthopedic braces and support systems market ... by 2018, at a developing CAGR of 4.4% from 2013 ... Orthopedic braces and support systems market, to get an idea ... of the segmentation of orthopedic braces and support systems market ...
(Date:10/18/2014)... The “Human Insulin Market- by Product Type, [Human ... Insulin (Rapid Acting, Long Acting, Premixed)], by Brand ... Forecast to 2018” provides a detailed overview of ... trends, and strategies impacting the global human insulin ... the revenue and share analysis. , The global ...
(Date:10/18/2014)... (PRWEB) October 18, 2014 The Asian ... in Asia with analysis and forecast of revenue. The ... to $712.3 million by 2018, at a CAGR of ... TOC of the Asian arthroscopic devices market, to get ... provides a glimpse of the segmentation of arthroscopic devices ...
Breaking Biology Technology:The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 2The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 3The Asian Orthopedic braces and support systems market is estimated to grow to around $416.5 million by 2018 - New Report by MicroMarket Monitor 2The Asian Orthopedic braces and support systems market is estimated to grow to around $416.5 million by 2018 - New Report by MicroMarket Monitor 3The Asian Orthopedic braces and support systems market is estimated to grow to around $416.5 million by 2018 - New Report by MicroMarket Monitor 4Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 2Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 3Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 4Medical Human Insulin Market Is Expected to Reach $42 billion by 2019 - New Research Report by MarketsandMarkets 5The Asian arthroscopic devices market is estimated to grow to $712.3 million by 2018 - New Report by MicroMarket Monitor 2The Asian arthroscopic devices market is estimated to grow to $712.3 million by 2018 - New Report by MicroMarket Monitor 3The Asian arthroscopic devices market is estimated to grow to $712.3 million by 2018 - New Report by MicroMarket Monitor 4
Cached News: