Sentences with phrase «reaches high concentrations»

Especially in spring months, this type of dust reaches high concentrations due to so - called dust storms.

Naturally occurring chemicals called nucleotides that have previously been linked to sleepiness only reach their highest concentrations in human breast milk that is expressed at night.

These molecules start the production of clock proteins, which in turn reach their highest concentration at a fixed time of day.

After 12 to 16 hours it reaches a high concentration that signals to the brain that it is time to sleep.

ADVOCIN is part of the fluoroquinolone class of antimicrobials, which can quickly reach a high concentration at the site of infection.

Not exact matches

It seems reasonable to suggest that rather than simply maintaining a high work rate until the RPE does rise to reach near - maximal levels, the exercising athlete would instead reduce the work rate under conditions of elevated body temperature8 — 10 or depleted muscle glycogen concentrations, 13 giving rise to the possibility that the regulation of self - paced exercise may utilise the RPE as an important mediator of pacing strategy.

The plasma concentration of pethidine in the infant is almost as high as that in the mother, reaching a maximum after 2 - 3 hours, after which the level falls slowly.

National studies show that students who eat school breakfast are more likely to: reach higher levels of math achievement; score higher on tests; have better concentration, memory and alertness, improved attendance, behavior, and academic performance; and maintain a healthy weight

However, in ultra-rapid metabolizers, higher - than - expected concentrations of the active metabolite (morphine) may occur in breast milk, and potentially dangerous levels may be reached in breastfed infants.

A common campaign goal was to get highest concentration of ads in front of a high concentration of targets, for instance, for which zip - code targeting was often cheaper than trying to reach voters one - on - one.

The water concentration reaches a maximum average of around 500 to 750 parts per million in the higher latitudes.

Men appear to be making less sperm on average, several studies report, and what is made tends to be subfertile, which the World Health Organization describes as sperm that swim poorly, take on a funny shape, fail to reach concentrations higher than 15 million per milliliter, or otherwise struggle to impregnate an egg.

Data from the new ice core array illustrates that Antarctic lead concentrations reached a peak in 1900 and remained high until the late 1920s, with brief declines during the Great Depression and the end of World War II.

In open road conditions, thick, dense and tall vegetation barriers restrict the freshly emitted vehicle emissions from reaching roadsides in high concentrations where people walk, cycle or live nearby.

That research found that the highest death rates occurred the day after particulate concentrations reached their highest levels, though the levels were subtle enough to go unnoticed at the time.

Record emissions of carbon dioxide mean atmospheric concentrations have reached levels that lead to the highest temperature increases

Neuroscientist Ken Mackie of Indiana University, another co-leader of the new study, says that natural cannabinoids can reach very high concentrations but are secreted by the brain in precise locations.

If they are later dislodged by another change in flow, they could then reach our taps in higher concentrations.»

The most dramatic effects were a nearly 2 mmHg rise in diastolic (the low number) blood pressure when the odor was rated an 8 compared with no odor, and a nearly 3 mmHg rise in systolic (the high number) blood pressure when hydrogen sulfide concentrations reached 10 parts per billion compared with no detectable level, the researchers reported last week in Environmental Health Perspectives.

'' [D] uring elongation, the tubule pulls the initial high pγGlu concentration away from the capsule and, as result, the capsule loses its ability to complete the tubule elongation before reaching the target,» Shavit said.

Overall, it is known that DDT concentrates in biological systems (particularly in body fat), that it is a toxin, and that it bioaccumulates up the food chain, reaching its greatest concentrations in higher animals such as humans.

We've also found that when these drugs are used in combinations, they don't reach high enough concentrations within the brain tumor to be effective.

Even without an inductor, this mutated fungus always produces the desired enzymes and, unlike other strains of fungus, does not stop doing so once a high glucose concentration has been reached.

Those effects will only get worse if nothing is done to stop dumping CO2 into the sky, much less to begin to reduce concentrations that have now reached more than 400 parts per million in the air — higher than that breathed by any members of our fellow Homo sapiens in the last 200,000 years.

The signals of a good supply of nutrients, ie a high concentration of UDP - GlcNAc, are a precondition that oncogenic signals reach the cell nucleus via STAT5.

For the study, five cultures were kept under a constant temperature and three different concentrations of carbon dioxide (CO2): a control value with today's conditions, the conditions that could be reached until the end of this century according to the most critical calculations of the Intergovernmental Panel on Climate Change (IPCC), and the highest possible degree of acidification.

Spacecraft instruments will gather continuous data on the interplanetary environment where the planetary system orbits, including measurements of the high - energy particles streaming from the sun and dust - particle concentrations in the inner reaches of the Kuiper Belt.

Apparently, as more stabilized PRDM16 accumulates in white fat cells, it eventually reaches a concentration high enough to flip the gene - controlled switch that begins the desired conversion to brown fat.

The data from Keck Observatory shows that peroxide is widespread across much of the surface of Europa, and the highest concentrations are reached in regions where Europa's ice is nearly pure water with very little sulfur contamination.

They chose a globular cluster based on the logic that it has a high concentration of stars, increasing the chances that someone might actually be present to detect the message in 22,000 years when it reaches them.

For this study, the researchers set a limit on the highest concentration that CO2 could reach.

Only when lead concentrations reach high levels do they start to pose a threat to your health.

Zeaxanthin and lutein are found in high concentrations in the macula of the eye and can block blue light from reaching the inner parts of the eye, including the retina.

Pase recommends reaching for a dark chocolate that contains a high concentration of cocoa.

In fact, it has even been shown to have higher concentrations of antioxidants and beneficial flavonoids — just make sure to reach for the packet without added sugar or creamer.

This decision was supported by the conclusions of the NIAAA report, which stated: «Although elderly drinkers reach higher blood alcohol concentrations (BACs) with lower levels of consumption than the younger counterparts, their level of impairment at any given BAC level does not differ from that of younger drinkers.»

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).

Uptake of black raspberry anthocyanins reached 7.5 % of the administered dose in the small intestinal tissue, which is much higher than the reported bioavailability of these compounds based on plasma and urine concentrations (13).

Since serums are formulated with a higher concentration of active ingredients, they're more potent and able to reach the deeper layers of the skin.

One study from the 1980s showed that CBD has very limited absorption from the GI tract into the bloodstream in dogs, so it might not even reach high enough concentrations in the brain to be effective.

This is the most effective delivery method, because it allows plasma concentrations of the vitamin to reach levels high enough to potentially kill cancer cells and offer other benefits.

For alkaline drugs, a high degree of ionic trapping leads to high antimicrobial concentrations in the tissue and secretions, whereas the acidic drugs such as the β - lactam antimicrobials do not reach concentrations equivalent to plasma concentrations.

Ponta Delgada offers visitors a slice of traditional Azorean life and has a high concentration of excellent cultural attractions within easy reach.

The winning strains progressed to the area with the higher drug dose, until they reached a drug concentration at which they could not survive.

He says ``... concentrations of carbon dioxide in the atmosphere eventually would reach levels higher than in the Pliocene era, more than 2.5 million years ago...» Surely this is an error.

While global concentrations are far below that, in local areas of high carbon pollution or poor air circulation (e.g. indoors, or on a highway), it's not hard to reach already.

As SC 24 slowly reaches Solar Maximum, and CO2 concentrations continue to rise, the probability that we'll see a new record high global temperature that no one can argue against likewise increases.

This concentration is only 25 ppm higher than today's value and projected to be reached within the next decade for all SRES scenarios (Plattner et al., 2008; Meehl et al., 2007) and within the next two decades for the recent set of multi-gas mitigation scenarios (Van Vuuren et al., 2008; Strassmann et al., 2008).

Now, should the reduced concentration persist, more energy will continue to accumulate in the system until a new, higher equilibrium temperature is reached (the equilibrium response).

-- Greenhouse gases continued to climb: Major greenhouse gas concentrations, including carbon dioxide (CO2), methane and nitrous oxide, continued to rise during 2013, once again reaching historic high values.