Navigation Links
Healthy rivers needed to remove nitrogen
Date:3/12/2008

ause it provides some of the best evidence of the extent to which healthy rivers and streams can help prevent eutrophication the excessive growth of algae and aquatic plants fueled by too much nitrogen. Eutrophication has been linked to harmful algal blooms and oxygen depletion in such places as the Gulf of Mexico, where the Mississippi River empties its nitrogen-rich waters, adversely affecting fishing and shrimp industries.

In their study, the scientists added small amounts of an uncommon, non-radioactive isotope of nitrogen N-15 to streams as a nitrate, which is the most prevalent form of nitrogen pollution, Gregory said. By adding the isotope, they were able to measure how far downstream the nitrate traveled, and analyze what processes removed it from the water.

In addition to the 40 to 60 percent taken up by tiny organisms, the researchers found denitrification accounted for about 19 percent of the nitrogen uptake across all the sites. Denitrification takes place through an anaerobic metabolic process that converts the nitrogen to a harmless gas and releases it into the atmosphere.

Slower moving streams with little oxygen have higher rates of denitrification, though they have other pitfalls, including increased risk to fish and humans because of the microbial stew they foster, Gregory pointed out.

The overall amount of denitrification by streams and rivers was lower than what many scientists had anticipated, he said. We had hoped it would be higher. That makes it even more essential to maintain healthy riparian zones so the organisms have the opportunity to process the nitrogen.

Oregon had even lower levels of denitrification than the national average. Johnson said the combination of high-gradient streams, oxygenated water and porous stream beds is not conducive to the denitrification process.

A lot of streams in Oregon have subsurface water flowing beneath the streambed through the gravel, she pointed ou
'/>"/>

Contact: Stan Gregory
stanley.gregory@oregonstate.edu
541-737-1951
Oregon State University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Iowa Staters talk biofuels, healthy oils and pharma crops at AAAS meeting
2. Want healthy gums? Hit the dairy aisle
3. Insect gut detects unhealthy meal
4. Gene, stem cell therapy only needs to be 50 percent effective to create a healthy heart
5. New study shows Concord grape juice has a heart-healthy effect not yet reported with red wine
6. Studies: Children obese due to a host of unhealthy pressures
7. Youre likely to order more calories at a healthy restaurant
8. Studying rivers for clues to global carbon cycle
9. Chemicals used as fire retardants could be harmful, UC-Riverside researchers say
10. Scientists from the UGR prove that rivers do not act as barriers for groundwater flow
11. UC-Riverside partners with Chinese university to address Chinas environmental problems
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/21/2014)... and other itchy, flaky maladies in humans has now ... reefs and the extreme environments of arctic soils and ... journal PLOS Pathogens considers the diversity, ecology, ... Malassezia in light of new insights gained from ... University of Hawai,i at Mānoa scientist Anthony Amend discovered ...
(Date:8/21/2014)... the Fram Strait is a key region in the global ... Greenland and Svalbard warm Atlantic water flows to the north ... Arctic water masses and sea ice push their way out ... of the Atlantic water cools here on its way to ... the water caused in this manner drives the global band ...
(Date:8/21/2014)... RUSTON, La. A team of researchers ... innovative method for using affordable, consumer-grade 3D ... implants that can contain antibacterial and chemotherapeutic ... team comprised of doctoral students and research ... nanosystems engineering programs collaborated to create filament ...
Breaking Biology News(10 mins):From dandruff to deep sea vents, an ecologically hyper-diverse fungus 2Arctic sea ice influenced force of the Gulf Stream 2Arctic sea ice influenced force of the Gulf Stream 3Louisiana Tech University researchers use 3D printers to create custom medical implants 2Louisiana Tech University researchers use 3D printers to create custom medical implants 3
... When a study in her lab showed that mate ... in the activity of an enzyme that promotes HDL ... Illinois scientist Elvira de Mejia headed for Argentina where ... centuries. She returned with a five-year agreement signed ...
... taking place in London on Thursday 25 and Friday ... natural scientists with what is becoming the worlds largest ... genomics - the Economic and Social Research Council (ESRC) ... are often described as the ,genetic information, that makes ...
... 17, 2007 Just in time for Halloween, researchers are ... social stress, in an article scheduled for publication in the ... adults alike gear up for the anticipation and excitement of ... our inherent fear of the dark. Grillon ...
Cached Biology News:More on mate tea: lower cholesterol and an international agreement 2From GM farm animals to embryonic stem cell research 2From GM farm animals to embryonic stem cell research 3Social stress + darkness = increased anxiety 2
(Date:8/22/2014)... The Global and China Diabetes Drugs Industry ... state of the Diabetes Drug industry in Global and ... the industry, including definitions, applications and industry chain structure. ... provided with a focus on history, developments, trends and ... international and Chinese situation is also offered. , The ...
(Date:8/22/2014)... The identification of protein-coding variants underlying ... by exome sequencing. Built on Roche NimbleGen’s proprietary ... EZ Developer system has been a proven tool ... present how he achieved coverage statistics similar to ... exome kits. With over 236,000 SNPs and over ...
(Date:8/21/2014)... international research team including DESY scientists has observed tiny ... team reports in the journal Science that ... inside the nanodroplets. It is the first time that ... larger samples of what is known as superfluid helium, ... our best expectations," says Andrey Vilesov of the University ...
(Date:8/21/2014)... August 21, 2014 The College of ... private college in the Mid-Hudson Region to be designated ... begin accepting applications from qualified “high-technology” businesses that align ... very pleased to have been selected for the START-UP ... transformative initiative to stimulate economic development in New York ...
Breaking Biology Technology:Diabetes Drugs Industry Growth Analysis in Global, China Regions Research Report Available at DeepResearchReports.com 2Diabetes Drugs Industry Growth Analysis in Global, China Regions Research Report Available at DeepResearchReports.com 3Efficient Identification of Protein-Coding Variants in a Model Organism Through Exome Sequencing, New Webinar Hosted by Xtalks 2Scientists observe quantum vortices in cold helium droplets 2The College of New Rochelle Becomes First Private College in Mid-Hudson Region to Earn START-UP NY Designation 2The College of New Rochelle Becomes First Private College in Mid-Hudson Region to Earn START-UP NY Designation 3
... concerned and troubled about the editorial titled, "End ... last week's Wisconsin State Journal (08/07/03). Wisconsin is only ... this channel of distribution and growing industry. The notion ... just plain bad business. We need to encourage the ...
... Now Largest Venture Capital Firm Based in Wisconsin ... raised and closed an additional round of fund raising ... to support applied technology, life sciences, healthcare and business ... and the Midwest. Milwaukees Baird Venture Partners was picked ...
... Wisconsin Technology Network recently interviewed two University of Wisconsin-Madison researchers ... principles behind learning a game can be used in academics. ... James Gee, Ph.D. , is a professor of Curriculum and ... the author of What Video Games Have to Teach Us ...
Cached Biology Technology:Is Wisconsin a Technology Leader or Laggard? 2Milwaukee Company Raises $90 million VC Fund for Midwest Projects 2Milwaukee Company Raises $90 million VC Fund for Midwest Projects 3The Learning Game - Researchers Study Video Gaming Principles that Apply to Education 2The Learning Game - Researchers Study Video Gaming Principles that Apply to Education 3The Learning Game - Researchers Study Video Gaming Principles that Apply to Education 4The Learning Game - Researchers Study Video Gaming Principles that Apply to Education 5The Learning Game - Researchers Study Video Gaming Principles that Apply to Education 6
... Gene Inspector can perform many sophisticated DNA analysis ... much more than just another sequence analysis product. ... suite of analyses to be performed each time ... custom style sheets which specify exactly how your ...
... first fully automated proteomics workcell. It integrates ... complete data tracking. It automates the entire ... final protein expression and measurement. The ProLink ... plate to any of its instruments from ...
...
... does sequence alignment, 3D structure visualization, phylogenetic ... all in a single application. ... databases, Uniprot, sort and filter them in ... want it, rapidly searching, filtering and sorting ...
Biology Products: