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Tag: "nitrate" at biology news

Premature births may be linked to seasonal levels of pesticides and nitrates in surface water

...n urban, suburban or rural resident. Pesticide and nitrate levels in surface water were also highest in May-June and lowest in August –September, according to the U.S. Geological Survey. For the past four years, Dr. Winchester and colleagues have focused attention on the outcomes of pregnancy in Indiana ...

Scientists: As rainfall changes, tropical plants may acclimate

...sis of the plants revealed that they switched from nitrate to ammonia "abruptly, and in unison" once the rainfall reached a certain level. "There's an abrupt change halfway through the rainfall gradient, and they all switch to this other form for their nutrition," Schuur said. That's a surprise partly ...

Fat overrides effects of vitamin C

...which is present in our saliva and is derived from nitrate in our diet, is thought to be a pre-carcinogen for gastric cancer. When it is swallowed and enters the acidic environment of the stomach, nitrite spontaneously forms nitrosating species able to convert a range of targets, such as secondary amines and...

New findings blow a decade of assumptions out of the water

...trogen gas is being converted into substances like nitrate that are usable by life ?in order to understand the environmental controls on nitrogen fixation and its likely response to climate change in the past and in the future, says Curtis Deutsch, a University of Washington research assistant and lead autho...

'Hidden-hero' microbes in soil, water may help naturally clean toxic sites

...tion proves successful on the uranium, technetium, nitrate and other potentially lethal leftovers at the Oak Ridge site, the process should work to mitigate contamination at more than 7,000 other sites nationwide -- and do so more economically and effectively than most conventional methods. "The stakes ar...

Microbe fixes nitrogen at a blistering 92 C

...ific archaea. Nitrogen can be fixed into ammonia, nitrate and other products that can be used by land and se...enting water hotter than 30 C contains very little nitrate so organisms in areas where the subseafloor temperatures are higher would lack nitrogen in a form th...

Alternatives to the use of nitrate as a fertiliser

...e the same growth in most crop plants as that when nitrate is used as a fertiliser. The studies carried out to date had revealed that the use of nitrate over years favours ?in most plants ?a sensitivity or even toxicity to ammonium. However, the toleran...

How E. coli bacterium generates simplicity from complexity

...s. E. coli can grow with or without oxygen, using nitrate or other molecules as its final electron acceptor. "We found that the type of terminal electron acceptor in the growth environment and the presence or absence of glucose is very important to E. coli," said Barrett. "Our simulations show that these tw...

'Acid rain' and forest mass: Another perspective

...re capable of oxidising the compound, thus forming nitrate and liberating protons that acidify the soil. Amongst the effects of the deposition of these compounds on the forest mass are the well-known nutrition disorders of the same. One classic effect is that of cation deficit (particularly magnesium) due to...

Life in deadly conditions

...ads to the depletion of ammonium. Because ammonium nitrate is a key building block of amino acids, the tiny o... of nitrogen: through the uptake and metabolism of nitrate and urea, as well as the efficient uptake of ammonia. The co-operation of theoretically and experim...

Organic farms produce same yields as conventional farms

...atter changes over time, nitrogen accumulation and nitrate leaching across organic and conventional agricultural systems. "First and foremost, we found that corn and soybean yields were the same across the three systems," said Pimentel, who noted that although organic corn yields were about one-third lower ...

Newly Discovered 'Branding' Process Helps Immune System Cells Pick Their Fights

... several distinct ways. For example, they attach a nitrate group to the amino acid tyrosine in the peptides, changing it to nitrotyrosine. Unanue's lab then showed that these changes increased the chances that various types of T cells would react to the modified peptides shown to them by antigen-presenting ...

Man-made wetland's effectiveness similar to natural marsh

...w a pretty significant reduction in phosphorus and nitrate concentrations ?close to the kind of decrease we t...g the wetland came as runoff from farm fields, and nitrate and phosphorus levels all peaked after fertilizer application in the spring. Still, the wetland was ...

Anammox bacteria produce nitrogen gas in oceans' snackbar

...results from the activity of bacteria that convert nitrate (via nitrite) with organic matter to nitrogen gas ...anammox bacteria can use organic matter to convert nitrate into nitrite (much better than denitrifying bacteria). This new finding even increases the importanc...

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