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Nitrogen in Biological News

Urban water ecology at the ESA annual meeting

... high levels of organic minerals in this case, nitrogen and phosphorous that originated from the sewage ... mosquitoes feed on microorganisms that require nitrogen and phosphorous to grow," Chaves says. "This ... through gill-like structures, so excess nitrogen and phosphorous could be toxic to them. Mosquito ...

Ozone, nitrogen change the way rising CO2 affects Earth's water

... carbon dioxide and ozone in the atmosphere and of nitrogen in the soil are likely to have an important but ... States when models account for changes in soil nitrogen levels and atmospheric ozone exposure. "Failure to consider the effects of nitrogen limitation and ozone on photosynthesis can lead ...

Fish on the menu of our ancestors

... protein collagen, using ratios of the isotopes of nitrogen and sulphur in particular, can show whether such ... Evolutionary Anthropology explains "Carbon and nitrogen isotope analysis of the human and associated ... a diet high in animal protein, and the high nitrogen isotope values suggest the consumption of ...

Nitrogen research shows how some plants invade, take over others

... how plants can change "nitrogen cycling" to gain nitrogen and how this allows plant species to invade and ... and hold on to nitrogen. Biologists know that nitrogen is crucial to plant growth that invasive species ... and PhD candidate Ramesh Laungani studied the nitrogen pool and fluxes in the ecosystem that included ...

Study highlights massive imbalances in global fertilizer use

... and human health have been substantial. nitrogen runoff from farms has contaminated surface and ... acre grew 98 percent between 1977 and 2005, while nitrogen fertilizer use increased a dramatic 271 percent, ... farmers in north China use about 525 pounds of nitrogen fertilizer per acre (588 kilograms per hectare) ...

Scientists sequence genome of the N2-fixing, soil-living bacterium Azotobacter vinelandii

... as a model study organism for investigation of nitrogen fixation and other biochemical processes. It will ... lives in soil and has the ability to convert nitrogen from the atmosphere into ammonia via bacterial enzymes called nitrogenases. nitrogen fixation is essential for life since different ...

UC Davis begins $2.8 million in studies of agricultural nitrogen's impacts

... publicized environmental issues we face: Escaped nitrogen from agricultural production affects the quality ... this challenge. And many farmers are unaware that nitrogen management can save them money." nitrogen is a chemical element that occurs naturally in ...

Newly discovered snow roots are 'evolutionary phenomenon'

... additional snow roots allow C. conorhiza to take nitrogen directly from the snow. Many mountain plants take up nitrogen from melted snow soaking into the ground only ... heavily enriched with an uncommon isotope of nitrogen (15N), was added to the snow surrounding C. ...

Stanford's Woods Institute awards new round of Environmental Venture Projects

... to develop a bioreactor that converts waste nitrogen into nitrous oxide that is subsequently decomposed into nitrogen and oxygen for thermal power generation. The goal is to develop a low-cost technique that removes nitrogen from water and produces oxygen as a byproduct ...

Double trouble for water life

... Excess phosphorus and nitrogen produced by human activities on neighboring land ... of North Carolina in the US, argues that nitrogen imbalance is equally damaging. He adds that a dual nutrient strategy tackling both phosphorus and nitrogen surplus - is necessary to manage effectively this ...

Illinois Soil Nitrogen Test measures microbial nitrogen

... view, cereal crops derive the majority of their nitrogen from the soil, not fertilizer. Soils differ ... these differences must be taken into account if nitrogen fertilizers are to be used efficiently. The Illinois Soil nitrogen Test (ISNT) was developed for this purpose, and ...

AGU journal highlights -- March 25, 2009

... release ground-level ozone precursors including nitrogen oxides and highly reactive organic compounds. ... by the reaction of sea salt with an oxide of nitrogen produced in urban atmospheres, can photodissociate into nitrogen dioxide and chlorine atoms. The former is a ...

Water acts as catalyst in explosives

... (OH) atoms in water transport oxygen from nitrogen storage to carbon fuel under PETN detonation ... are not well understood. The team found that nitrogen loses its oxygen mostly to hydrogen, not to ... mostly from hydroxide, rather than directly from nitrogen monoxide (NO) ...

Tree species composition influences nitrogen loss from forests

... WI, MARCH 16, 2009--Throughout the world, nitrogen compounds are released to the atmosphere from ... sources, they receive some of the highest nitrogen deposition rates in North America due to ... plants for food, fiber, or flowers, knows that nitrogen is crucial for healthy plant growth. But ...

Termite killer lingers as a potent greenhouse gas

... about the greater-than-expected prevalence of nitrogen trifluoride, a gas used as a cleaning agent ... and other electronics. The first measurements of nitrogen trifluoride, reported in October, has led to ... Salameh and Christina Harth contributed to the nitrogen trifluoride finding as well as the sulfuryl ...

Iowa State researchers developing clean, renewable energy for ethanol industry

... of fuel. Biomass, for example, contains fixed nitrogen from the air and from fertilizers used to produce the biomass. Gasifying biomass releases the fixed nitrogen as ammonia in the generated gases. Improperly burning gases containing ammonia could produce nitrogen oxide emissions. Such emissions aren't acceptable ...

Researchers call for nitrogen and phosphorus reductions to combat eutrophication in aquatic systems

... is renewing calls for policymakers to reduce both nitrogen and phosphorus when attempting to alleviate ... successful due to complex interactions between nitrogen and phosphorus in fresh and coastal water ... us to focus pollution reductions efforts on both nitrogen and phosphorus," said co-author Dr. Donald Boesch ...

Nutrient pollution chokes marine and freshwater ecosystems

... in many lakes, will require reducing both nitrogen and phosphorus pollution. Because streams and ... two-pronged approach. Plant growth is tied to nitrogen and phosphorus availability. Human activities ... the overproduction of aquatic plants and algae. nitrogen pollution is largely derived from agricultural ...

Cropland diversity reduces nitrogen pollution

... the biodiversity of crops is high, less dissolved nitrogen is found exiting the surrounding watersheds. nitrogen from agricultural fertilizers leaches through ... fertilizers has caused a greater effect: the nitrogen leakage rate is higher." Modern farms tend to ...

World fertilizer prices drop dramatically after soaring to all-time highs

... The price of urea, the world's most common nitrogen fertilizer, rose from about $280 to $405 per ton ... increase in the price of natural gasessential for nitrogen fertilizer production. Phosphate prices were also ... facilities open and the current lower prices for nitrogen and phosphate recover, Gregory says. ...

USGS Science Picks

... of Slovakia examined what would happen when nitrogen levels in soils, typically from industry and ... to certain levels. Findings show that high nitrogen levels could result in increased acidification of ... growth and increased pollution of surface water. nitrogen levels in soils throughout Europe and North ...

EPA and USDA should create new initiative to better monitor nutrients

... for reducing nutrient pollutants such as nitrogen and phosphorus -- across the basin. In addition, ... zone" derives from excess nutrients, such as nitrogen and phosphorus from fertilizers and other ... permits. Although the estimated current flux of nitrogen and phosphorus being delivered to the Gulf of ...

Princeton-led team finds secret ingredient for the health of tropical rainforests

... the rare trace element molybdenum to capture the nitrogen fertilizer needed to support their wildly productive growth. Most of the nitrogen that supports the rapid, lush growth of rainforests comes from tiny bacteria that can turn nitrogen in the air into fertilizer in the soil. Until ...

Acid soils in Slovakia tell somber tale

... Increasing levels of nitrogen deposition associated with industry and ... Geological Survey, shows what can happen when nitrogen deposition in any part of the world increases to ... results, the authors warn that the high levels of nitrogen deposited in Europe and North America over the ...

Mysterious microbe plays important role in ocean ecology

... to rethink their understanding of how carbon and nitrogen cycle through ocean ecosystems. A paper ... and the complex integration of the ocean's nitrogen and carbon cycles," said Philip Taylor, section ... which funded the work. "The fact that nitrogen fixation in these abundant unicells is decoupled ...

Mysterious microbe may play important role in ocean ecology

... to rethink their understanding of how carbon and nitrogen cycle through ocean ecosystems. A research team ... natural fertilizer to the oceans by "fixing" nitrogen from the atmosphere into a form useable by other ... make molecules like ammonia and nitrate. Because nitrogen is essential for all forms of ...

K-State research: Freshwater pollution costs US at least $4.3 billion a year

... MANHATTAN -- Pollution by phosphorous and nitrogen isn't just bad for lakes, streams and other ... at U.S. Environmental Protection Agency data on nitrogen and phosphorous levels in bodies of water throughout the country. nitrogen and phosphorous are nutrients that are applied to ...

Urea tanks on diesel trucks -- that's the law in the United States starting in 2010

... into the vehicles' exhaust stream to "scrub" nitrogen oxide (NOx) from the diesel exhaust. NOx, a ... aqueous urea solution 32 (AUS 32), a clear 32.5% nitrogen solution of high-purity urea in demineralized ... new demand for urea, the world's most widely used nitrogen fertilizer. Some are concerned that the new use ...

Soil Science Society of America presents awards in Houston

... has contributed to the development of the nitrogen Index, nitrogen Trading Tool, and NLEAP-GIS. With over 130 ... use of cover crops, 15N isotopic techniques and nitrogen management practices and tools have greatly ...

Soil Science Society of America presents 2008 fellows

... recent publications edited include Managing Crop nitrogen for Weather, and Quantifying and Understanding Plant nitrogen Uptake for Systems Modeling. Seth M. ... transport in soils, to soil carbon and nitrogen dynamics and plant growth. Dr. Ma has contributed ...

Fertilizers -- a growing threat to sea life

... not the only threat to the planet. Changes to the nitrogen cycle, caused in large part by the widespread use ... 300 years, to trace the history of changes to nitrogen loading in the estuary. She highlights how ... expansion, and urbanization have released nitrogen from the land and moved it to Chesapeake Bay, ...

When it comes to forest soil, wildfires pack 1-2 punch

... displaced considerable amounts of carbon and nitrogen from the underlying mineral soil layer and left ... materials may have been lost. Some carbon and nitrogen were lost as gasesconsisting mostly of carbon dioxide, nitrogen dioxide, and water vaporand some in an inch of ...

Diatom genome helps explain success in trapping excess carbon in oceans

... not to eliminate it like animals do, because nitrogen is a precious nutrient in the ocean. What's ... 's development. Iron is even more precious than nitrogen in the ocean and its absence in the southern ... occurs processes such as photosynthesis and nitrogen assimilation are suppressed. Other studies, which ...

Lichens function as indicators of nitrogen pollution in forests

... have found lichens can give insight into nitrogen air pollution effects on Sierra Nevada and San ... Pollution and are significant because nitrogen from air pollution causes detrimental chemical ... and Technology. According to the scientists, nitrogen pollution that has virtually eliminated lichen ...

Nitrogen applied

... in this cycle, and while it is known that using nitrogen fertilizers can increase these crops biomass, the resulting levels of nitrogen for the following cash crops have been unknown. ... greater biomass along with an increased amount of nitrogen available for the cash crop. Results from the ...

Photosynthesizing bacteria with a day-night cycle contain rare chromosome

... functions, such as doctoring atmospheric nitrogen so other species can use it. This so-called nitrogen fixation is performed by a handful of bacterial ... spends its nights breaking down that sugar to fix nitrogen and to produce different compounds. And bacteria ...

As Andean glacier retreats, tiny life forms swiftly move in, CU-Boulder study shows

... growing by snatching gaseous forms of carbon and nitrogen from the atmosphere, Schmidt said. "The most ... particles. In addition, they discovered that nitrogen fixation rates -- the process in which nitrogen gas is converted by bacteria into compounds in ...

A little nitrogen can go a long way

... (UNL) compared an approach to site-specific nitrogen and seed density management for irrigated maize, ... (the amount of grain produced per kilogram of nitrogen applied), and the effect of site-specific ... length strips, evaluating uniform management of nitrogen and seed density (current BMP), ...

Evolving designer ecosystem sheds light on unintended consequences

... flux of NO3 through urban waterways by returning nitrogen leached from historic fertilizer applications to ... shown to be critical to the removal of excess nitrogen from agricultural fields and waste water run-off ... bacterially-mediated process, converts nitrate to nitrogen gas, which then is released harmlessly to the ...

Complex ocean behavior studied with 'artificial upwelling'

... it into surface waters near Hawaii that lack the nitrogen and phosphorous necessary to support high ... specific ratios of nutrients particularly nitrogen and phosphorous to carbon dioxide by targeting ... of 300 to 700 meters has the proper ratio of nitrogen and phosphorus to trigger a two-stage ...
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