Sentences with phrase «nitrate concentration»

Factors affecting the streamflow and in - stream nitrate concentration in semi-arid areas: sub-surface flow - generation, vertical distribution of soil nitrate and drainage properties, and the connectivity of impervious areas

Accordingly, comets break down N2 in the atmosphere to nitrate (NOx), increasing nitrate concentration.

Researchers found that the high nitrate concentration in spinach (juiced in the study) increases the plasma nitrate and nitrate concentrations in the body, which effectively lowers blood pressure.

This dataset contains nitrate concentration and isotopic composition (d15N, d18O, D17O) measurements on the WAIS Divide WDC06A ice core.

David Karl, Professor of Oceanography and Director of the Daniel K. Inouye Center for Microbial Oceanography at the University of Hawai'i, teamed up with researchers from Korea, Switzerland and the U.S. National Oceanic and Atmospheric Administration to assess changes in nitrate concentration between the 1960s and 2000s across the open North Pacific Ocean.

Their analysis, which could discern human - derived nitrogen from natural nitrogen fixation, revealed that the oceanic nitrate concentration increased significantly over the last 30 years in surface waters of the North Pacific due largely to the enhanced deposition of nitrogen from the atmosphere.

Each sample is brought to the surface, analyzed for its nitrate concentration and labeled with an isotopic signature.

During the 2000s, nitrate concentration in rain and snow declined by more than 50 percent and nitrate concentration declined in lakes.

When serving «nitrate» vegetables, the levels of nitrates in Organics are significantly reduced though not 100 percent eradicated (Nitrates are naturally occurring and farming without using nitrogen fertilizers does not eliminate nitrate concentration).

When serving «nitrate» vegetables, the levels of nitrates in Organics are reduced though not 100 percent eradicated (Nitrates are naturally occurring and farming without using nitrogen fertilizers does not eliminate nitrate concentration).

Nitrate concentrations from monitoring sites in the region have been recorded well above acceptable limits (50 mg nitrate litre - 1) with maximum concentrations of 283 mg nitrate litre - 1 found.

High nitrate concentrations can be particularly dangerous for babies under six months, since nitrate interferes with the ability of blood to carry oxygen.

Water with high nitrate concentrations should not be ingested by the infant or used for preparation of infant formulas or infant foods.

Most reported cases have been ascribed to the use of contaminated well water for preparation of infant formula.1 — 3 Fifteen million families in the United States obtain their drinking water from unregulated wells.4 In a survey of 5500 private water supplies from 9 Midwestern states, 13 % of the wells were found to have nitrate concentrations > 10 mg / L or 10 ppm nitrate nitrogen, 5 the federal maximum contaminant level.6 It is estimated that 2 million families drink water from private wells that fail to meet the federal drinking - water standard for nitrate, and 40000 infants younger than 6 months live in homes that have nitrate - contaminated water supplies.4 In urban areas, municipal wastewater - treatment discharges (a source of nutrients) on surrounding farmland aggravate the problem.7

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

Their assessment revealed a consistent picture of increasing nitrate concentrations, the magnitude and pattern of which can only be explained by the observed increase in atmospheric nitrogen deposition.

UNL researchers Karrie Weber and Jason Nolan found that the High Plains aquifer contains uranium concentrations up to 89 times the EPA standard and nitrate concentrations up to 189 times greater.

In this study, an OSU team that included graduate students Lauren Fullmer, Sara Goberna - Ferron and Lev Zakharov overcame the need for ligands with a three - pronged strategy: pH - driven hydrolysis by oxidative dissolution of zinc; metal nitrate concentrations 10 times higher than conventional syntheses; and azeotropic evaporation for driving simultaneous cluster assembly and crystallization at the surface of the solution.

Schaider and her colleagues also looked at nitrate levels in each well and found that wells with higher nitrate concentrations also had more contaminants, as well as higher concentrations of contaminants.

Our saliva may have nitrate concentrations 10 times that of our blood.

The longer time needed to reach peak plasma nitrate concentrations after ingestion of rocket salad and spinach beverages may be related to their higher fiber content and the larger volume ingested (Supplemental Table 1), likely resulting in a slower gastric emptying (34).

In two years, they»... saw a pretty significant reduction in phosphorus and nitrate concentrations — close to the kind of decrease we typically see in a natural wetland.»

Not exact matches

Concentrations of total nitrogen were 10 %, nitrate 30 % and nitrite 87 % lower in organic compared to conventional crops.

Organic foods are grown without the use of commercial nitrate fertilizers and thus the risk of nitrate contamination / concentration is minimized, but not eliminated.

Beets contain high concentrations of nitrates, which are converted into nitrites in the body.

What happens is that a too high concentration of nitrates can prevent oxygen from being carried properly in your baby's blood.

The American Academy of Pediatrics (AAP) warns parents not to feed these vegetables to babies under 3 months old because the concentration of nitrates in them could be toxic for young babies.

Boiling water with nitrate nitrogen concentrations of < 10 ppm for 1 minute generally is sufficient to kill microorganisms without over concentrating nitrate.21

They might spend the term figuring out the concentration of nitrate in the college pond, for example, tangling along the way with the real - world challenges of accurate assessment.

The team found that the blood of Tibetans had more than 10 times the concentration of biologically active nitric oxide breakdown products, such as nitrate and nitrite, than did blood from people who lived at sea level, signifying a high level of nitric oxide in their bloodstreams.

Girguis also rigged up filters to adjust the concentrations of hydrogen sulfide, nitrate, oxygen, and carbon dioxide in the cylinders to match the worms» natural environment.

The greater the concentration of Hispanics, Asians, African Americans or poor residents in an area, the more likely that potentially dangerous compounds such as vanadium, nitrates and zinc are in the mix of fine particles they breathe.

In an Antarctic ice core, researchers in Japan discovered spikes in the concentration of nitrate ions.

They limited data sources to locations around the world in which paleoceanographic data also exist, using seven variables: salinity; potential temperature; oxygen isotope ratios in water; carbon isotope ratios in dissolved inorganic carbon; and concentrations of phosphate, nitrate, and dissolved oxygen.

Occasionally, upwelling events increase the productivity in these ocean deserts: Oceanic eddies transport deep - water containing high concentrations of nitrate, phosphate and silicate, towards the surface.

Acidity decline in Antarctic ice cores during the Little Ice Age linked to changes in atmospheric nitrate and sea salt concentrations.

High concentrations of nitrates are found in beetroot.

These products will quite often be found to have a high nitrate (NO3) concentration as well.

Caution should be exercised in collecting this weed in the wild, because when growing in heavily fertilised agricultural fields the plant can accumulate dangerously high concentrations of nitrates.

We assessed the acute effects of ingestion of various nitrate - rich sources on plasma nitrate and nitrite concentrations and resting blood pressure.

Both sources have been shown to substantially increase plasma nitrate and nitrite concentrations, improve exercise performance (1 — 5), and lower blood pressure (6 — 8) in healthy individuals.

There are only two ways to reduce its concentration: change water or introduce something that consumes nitrate.

Photo paper, at times unexposed, at times exposed to various sources of colored light, is led through the processing machine in which is left — in varying degrees of concentration — water and traces of used chemicals, particularly silver nitrate (thus the name «Silver»).

Do you mean simulations isolating sulfate and nitrate aerosols or do you mean simulations isolating CFCs (Chlorofluorocarbons), a relatively unimportant greenhouse gas - due to its relatively extremely low concentrations in the atmosphere?).

«Many lines of evidence fromlaboratory studies demonstrate that elevated CO2 concentrations in the atmosphere inhibit leaf nitrate (NO3 --RRB- assimilation in C3 plants.

The concentrations of nitrate and phosphate have a known empirical relationship with δ13C at 42oN in the northeast Pacific, following Redfield ratios for both nitrate and phosphate [25].

The direct RF due to nitrate aerosol is therefore sensitive to atmospheric concentrations of ammonia as well as NOx emissions.

Surface observations of fine - mode nitrate particles show that high concentrations are mainly found in highly industrialised regions, while low concentrations are found in rural areas (Malm et al., 2004; Putaud et al., 2004).

The sum of nitrate and nitrite concentrations in the chemostats was at all generation points below 1 µM (table 1).

The researchers built coin cell batteries like the ones in calculators, remote controls and watches and added two chemicals — lithium nitrate and lithium polysulfide — to the electrolyte in various concentrations.