Sentences with phrase «at concentrations»

The technique is so sensitive that the researchers can distinguish dozens of compounds at concentrations of just parts per billion.

The technique is so accurate and sensitive that he can determine if there is a molecule of any chemical present even at concentrations as low as one part per billion.

Very disturbing and horrific subject matter when reading about what went on at the concentration camp - hard to read at times and hard to believe this book is based on true events.

Even with the use of over the counter medications, which are relatively safe, may at some concentration level pose danger to the breastfed child.

When you drink alcohol, it passes into your breast milk at concentrations similar to those found in your bloodstream.

Advances in technology and analytical chemistry have lowered the limits of detection, allowing for the detection of these chemicals at concentrations as low as parts per billion and parts per trillion.

Plants contain dopamine, serotonin, and melatonin at concentrations high enough to actually alter levels in our bloodstream.

When a breastfeeding mother drinks alcohol, it passes into her breast milk at concentrations similar to that in her own bloodstream.

Scientists, however, are uncertain what actually happens in the human body at the concentrations of chemicals that people encounter in fruits and vegetables.

As with most attempts at concentration, we soon notice distracting noises, thoughts, and smells.

If not, he said, that incomplete work could eat away at your concentration.

I think this stuff is bogus at the concentrations it says.

And yet, the effect on the cells is modest and identical at every concentration.

It is perhaps no surprise then, that dogs can detect substances at concentrations of up to a million times lower than humans can perceive them.

Look at the concentration numbers there at a known ground level source, then look again at that methane emergency blog and the concentrations reported for up high in the polar atmosphere.

Nothing at all about whether the chemicals are dangerous, are dangerous at the concentrations detected, or whether this is notably different to any other industrial process.

Yes, CO2 can cause headaches but normally these start at concentrations of 30,000 ppm; and at even higher concentrations it can be fatal.

Above this zone methane is only present in its dissolved form at concentrations that decrease towards the sediment surface.

The IPCC projects global average temperatures at a concentration of 650 ppm to be 3.6 degrees Celsius.

At each concentration level, a small group of bacteria adapted and survive.

So we don't need to look at emissions to determine which path reality took, we can just look at the concentrations.

So it is conceivable that they may be active in the body at concentrations of hundreds or thousands of times that of biologically active molecules.

Government vs Brazilian Blowout The FDA sent a violation letter to GIB about Brazilian Blowout's Acai Professional Smoothing Solution in 2011 after it found methylene glycol, the liquid form of formaldehyde, in samples at concentrations ranging from 8.7 to 10.4 percent.

Studies in bullfrogs found that triclosan disrupts the endocrine system — blocking the tadpoles» development into frogs at concentrations found in the environment.

To meet World Health Organization (WHO) standards for safety, arsenic must not be present in drinking water at concentrations greater than 10 parts per billion, but in some countries, such as Bangladesh, the levels far exceed that danger point.

Oxidising microbiocides such as chlorine bleach are used at concentrations ranging from 0.5 up to 50,000 ppm, and are a vital part of our armoury to prevent infections in healthcare settings, water treatment, the food and pharmaceuticals industries — and also in the home when used in a targeted manner to prevent the spread of infectious germs.

It is a colorless, odorless gas that is not toxic to humans and other animals even at concentrations much higher than we are currently experiencing.

According to a 2009 report by the NRDC - Domestic animal flea and tick shampoos, collars, sprays, and dips can expose adults and children to toxic pesticides at concentrations that exceed by 500 times — 50,000 percent — the safe levels established by the Environmental Protection Agency.

The grass - covered hills are actually soil tainted with PCBs at a concentration less than 10 parts per million.

Although the Environmental Protection Agency's (EPA's) current safe drinking water standard is 3 ppb, atrazine is often found in central North American waters at concentrations of up 10 ppb in spring, and peaks greater than 200 ppb have been recorded.

The widely - used compound is a potent endocrine disruptor that has been shown to cause immunosuppression, hermaphroditism and complete sex reversal in male frogs at concentrations as low as 2.5 parts per billion.

For the current study, researchers spiked soil with a mixture of PCBs at concentrations commonly found in soils and sediments — and which pose a potential risk to human and environmental health.

The field component of this study is one of the first to report amphetamine in wastewater - impacted environments at concentrations approaching 1 μg L - 1.

The trials revealed that honey bees prefer the naturally occurring chemical quercetin over controls at all concentrations tested.

After counting the cells, we centrifuged them at 500 g for 5 minutes and resuspended in FACS buffer at a concentration of 7 × 106 cells / ml.

They showed that endocrine disruptors — applied at concentrations measured in body fluids — directly open CatSper and, thereby, increase calcium levels in sperm, change their swimming behavior, and trigger the release of digestive enzymes that help sperm to break through the egg coat.

Area of Medium Contamination: An airspace of defined dimensions where volcanic ash may be encountered at concentrations greater than 2x10 - 3 g / m3, but less than 4x10 - 3 g / m3.

In 2001, the Cosmetic Ingredient Review (CIR) published a final report on the safety assessment of benzyl alcohol, benzoic acid, and sodium benzoate with the conclusion that benzyl alcohol, benzoic acid, and sodium benzoate are safe for use in cosmetic formulations at concentrations up to 5 %.

«We saw clearance of the virus at concentrations of BX795 that were five times lower than concentrations of antiviral compounds in available nucleoside analogs,» Shukla said.

It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state, as a trace gas at a concentration of 0.039 per cent by volume.

Transition metals occur in living cells at concentrations of several parts per million, and Mango says that they can catalyse natural gas formation at even these low levels.