Sentences with phrase «high nitrogen concentration»

Evidence from the samples they gathered and tested showed that human wastewater nitrogen from septic systems was a major contributor to the high nitrogen concentrations in the estuary and downstream coastal reefs, the latter representing the northernmost extent of coral growth in South Florida.

Not exact matches

For breastfed infants, there is no evidence of an increased risk of methemoglobinemia from maternal ingestion of water with nitrate nitrogen concentrations as high as 100 ppm, because these mothers do not produce milk with high nitrate concentrations.16 Furthermore, the predominant organism in the gastrointestinal tract (Lactobacillus species) of the breastfed infant does not reduce nitrate to nitrite (see following section).14

The proportion of diesel vehicles registered in Leipzig however rose from 19 to 26 % between 2010 and 2016 — with negative consequences: While black carbon and the number concentration of ultrafine particles decreased, the concentration of gaseous nitrogen oxides (NOx) is stagnant and is still too high.

At the end of the study, children who lived in neighborhoods with the highest concentrations of nitrogen dioxide and particulates had experienced greater declines in insulin sensitivity and had signs of impaired pancreatic beta cells, which produce insulin.

In a typical urban area with a high level of background air pollution — for example, around 15 micrograms of fine particulate matter (PM2.5) per cubic metre, or a nitrogen dioxide concentration around 33 micrograms per cubic metre — an extra 300 trees per square kilometre was associated with around 50 fewer emergency asthma cases per 100,000 residents over the 15 year study period.

Based on measurements of 45,000 individual plants from 3,680 species, and using high - tech statistical mapping protocols, the team created global maps of plant traits including leaf nitrogen concentration, leaf phosphorus concentration, and specific leaf area (a measure of area displayed to intercept light per unit investment in leaf biomass).

These types of plants have been associated with environments that supply high concentrations of essential nutrients, such as nitrogen and phosphorus, and warm - wet climatic conditions, both of which help plants photosynthesize more productively.

With regard to the air quality in cities with high concentrations of nitrogen oxides, this property of Arabidopsis thaliana plants could contribute significantly to the reduction of NO and thus improve air quality.

In nature, bacteria flourish best in the presence of high concentrations of phosphates and nitrogen,» says Netzer.

Researchers at the University of Gothenburg have now revealed that the concentration of nitrogen in plants» tissue is lower in air with high levels of carbon dioxide, regardless of whether or not the plants» growth is stimulated.

The models showed that thinner carbon nanotubes with a relatively high concentration of nitrogen would perform best, as oxygen atoms readily bond to the carbon atom nearest the nitrogen.

Soil had the lowest remediation of phosphorus and highest concentration of phosphorus in its effluent, and was similar in nitrogen removal efficiency to slate.

In one sentence: Scientists at Pacific Northwest National Laboratory determined that high concentrations of nitrogen oxides influence the creation of the brown haze that hangs over the world's megacities, providing new insights that can create higher accuracy climate and atmospheric models.

Relative growth rates, carbon, nitrogen, and the C: N ratio in tissue samples were influenced by higher concentrations of NH 4 +.

The researchers» analysis found organic grains and produce to have higher concentrations of antioxidants, lower levels of cadmium and nitrogen compounds and fewer pesticide residues.

Flying after diving increases the risk of decompression sickness: because of the high concentration of nitrogen in your blood, gas bubbles can form within your body and generate health issues.

«a FACE study conducted at Maricopa, Arizona, USA — spring wheat was grown for two seasons at atmospheric CO2 concentrations of ambient and ambient + 200 ppm, with half of each plot receiving high amounts of nitrogen and half receiving low amounts.

In some cases, current CO2 levels may contribute some degree of limitation, so that higher CO2 concentrations will be salutary, but with very substantial climate change, it is likely that most of the limitation will involve water and nitrogen.

Also characteristic of the atmosphere over urban centres are substantially higher concentrations of pollutants such as carbon monoxide, the oxides of sulfur and nitrogen, hydrocarbons, oxidants, and particulate matter.

But pollution also covers hundreds of chemicals which are fine or even beneficial at low levels but which if released in large quantities or in problematic circumstances cause «harm» — like phosphorus (grows your veges but also leads to toxic cyanobacterial blooms which kill cattle), nitrogen (grows crops kills many native species of plants and promotes weed growth costing farmers), copper (used as an oxygen carrier by gastropods but in high concentrations kills the life in sediments which feed fish), hormones like oestrogen (essential for regulating bodies but in high concentrations confuse reproductive cycles especially with marine life) or maybe molasses from a sugar mill (good for rum but when dumped into east coast estuaries used to cause oxygen sag in estuaries leading to massive fish kills).

The paper, «Reconstruction of past atmospheric CO2 concentrations by ice core analysis», acknowledges that, due to impurities, liquid water can exist as low as -50 deg C. Diffusion of CO2 into this water, due to its far higher solubility than nitrogen and oxygen, will partially deplete the CO2 from trapped air bubbles.

However, when nitrogen oxides are present in high concentrations as a result of human - caused pollution, VOCs react with these pollutants to produce more ozone and methane.

Neff W. D., J. Crawford, M. Buhr, J. Nicovich, G. Chen and D. Davis (March 2018): The meteorology and chemistry of high nitrogen oxide concentrations in the stable boundary layer at the South Pole.

High humidity, high water levels and through put, high proper nutrient levels, higher concentration of nitrogen and and much higher levels of High humidity, high water levels and through put, high proper nutrient levels, higher concentration of nitrogen and and much higher levels of high water levels and through put, high proper nutrient levels, higher concentration of nitrogen and and much higher levels of high proper nutrient levels, higher concentration of nitrogen and and much higher levels of CO2.