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:7/9/2015)... 2015 Research and ... the "Biometrics for Banking; Market & Technology ... to their offering. The adoption for ... growth and the forecast is that by 2020 ... companies involved in delivering biometric systems to the ...
(Date:7/8/2015)... FRANKLIN LAKES , N.J. and NEW YORK ... and Company) and Guidepoint today announced ... selected start-up healthcare companies with free access to Guidepoint,s ... mentoring several start-ups that are developing cutting-edge technologies to ... of a dedicated Guidepoint research manager, each start-up entrepreneur ...
(Date:7/7/2015)... 7, 2015  Based on its recent analysis ... recognizes Credence ID, LLC with the 2015 Asia-Pacific ... the Year Award. Credence ID has developed a ... mission of offering enrollment and identification solutions to ... ID was formed by experts from the mobile ...
Breaking Biology News(10 mins):Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 3BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 2BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 3Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 2Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 3Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 4Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 5
... athletic performance can lead to diabetes, reports a study published ... , The study reports the case of a 36 year ... , He had lost 40 kg in 12 months, ... appetite. , He admitted to using anabolic steroids for ...
... develop high levels of genetic diversity and acquire mutations ... producing a vaccine. David Nickle et al present here ... the diversity of HIV or other variable pathogens. , ... in the strains of the virus by describing the ...
... University School of Medicine has helped confirm the reliability ... ushering in the long-promised era of personalized medicine based ... one of the five sites that helped determine that ... risk of developing cirrhosis from chronic hepatitis C infection. ...
Cached Biology News:New test helps identify hepatitis C patients at high risk of developing cirrhosis 2New test helps identify hepatitis C patients at high risk of developing cirrhosis 3
(Date:8/3/2015)... MARIETTA, Ga. , Aug. 3, 2015  MiMedx ... medicine company utilizing human amniotic tissue and patent-protected processes ... the Wound Care, Surgical, Orthopedic, Spine, Sports Medicine, Ophthalmic ... will present at the 35 th Annual Canaccord|Genuity ...  Parker H. "Pete" Petit, Chairman and CEO, William ...
(Date:8/3/2015)... WESTWOOD, Mass. , Aug. 3, 2015  Merck ... company for innovative and top-quality high-tech products in the ... together with the US-based company Nano-C, their development and ... field of organic photovoltaics (OPV). Merck KGaA, Darmstadt, ... participate in the growing OPV sector. Novel ...
(Date:8/3/2015)...  Aethlon Medical, Inc. (Nasdaq: AEMD ), the ... diseases, today announced that it will host its First ... Thursday, August 13, 2015 at 4:30 p.m. Eastern Time. ... release of fiscal 2016 first quarter results.  A recorded ... hours after the call at the Investor Relations portion ...
(Date:8/3/2015)... , Aug. 3, 2015   Intrexon Corporation ... first half and second quarter 2015 financial results after ... 2015.  The Company will host a conference call at ... a general business update. The conference call ... 1-412-902-4262 (International), and asking to join the "Intrexon Corporation ...
Breaking Biology Technology:MiMedx To Present At 35th Annual Canaccord|Genuity Growth Conference 2Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 2Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 3Merck KGaA, Darmstadt, Germany, and Nano-C Present Enhanced Materials for Organic Photovoltaics 4Aethlon Medical To Host First Quarter Fiscal 2016 Investor Call on August 13, 2015 2Intrexon to Announce First Half and Second Quarter 2015 Financial Results and Host Conference Call on August 10th 2
... Eindhoven University of Technology (TU/e) has appointed prof. dr. Stuart ... professor at Stanford University and an IBM Fellow of the ... he was awarded an honorary doctorate by TU/e. Parkin is ... is the first ,distinguished professor, of TU/e, an international top ...
... ANGELES, Oct. 20 Humanitarian, Dr. Gary Michelson,is ... animals,",says Aimee Gilbreath, Executive Director of Found Animals ... 501(c)3., Found Animals and its strategic partner ... announced the launch of The Michelson Prize in,Reproductive ...
... directors,of Eli Lilly and Company (NYSE: LLY ) today ... a share on outstanding common stock. This,is the same dividend ... and,brings the total annual dividend for 2008 to $1.88 per ... shareholders of record at,the close of business on November 14, ...
Cached Biology Technology:Humanitarian Offers $75 Million for Single Dose Sterilization of Cats and Dogs 2Humanitarian Offers $75 Million for Single Dose Sterilization of Cats and Dogs 3Humanitarian Offers $75 Million for Single Dose Sterilization of Cats and Dogs 4
Gamma delta T Lymphocytes Purified Anti-Porcine clone MAC320, Isotype Rat IgG 2a , kappa, 0.1 mg Consult technical datasheet for details....
Request Info...
Tris-EDTA Buffer Solution, 1X, pH 8.0, sterile, Molecular Biology Grade...
... Xylene Resistant (X/R) Red System consists ... Red Activator and X/R Red Buffer. ... alkaline phosphatase to produce red staining ... ,Kit Contains:, , Buffer, 100 mL ...
Biology Products: