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Concentration in Biological News

Study explains potential failure of oral contraceptives with obese women

... five days for the drugs to achieve their maximum concentration in women of normal weight, an average of 10 days ... But the delay in reaching a steady state drug concentration raises questions about how well oral ... long it would take for her to reach an effective concentration level of a particular contraceptive, and this ...

Why the thumb of the right hand is on the left hand side

... release is available in German . It is the concentration of a few signaling molecules that determines the ... mechanisms accounts for the interpretation of the concentration of the signaling molecule Hedgehog. The ... Biology of the University of Innsbruck. "The concentration of Hedgehog makes the thumb of the right hand ...

Scientists at CSHL discover mobile small RNAs that set up leaf patterning in plants

... leaves but traffic from this source to form a concentration gradient across each leaf. This graded ... a defined location, their movement establishes a concentration gradient that patterns a developing tissue such ... in plant leaves, ta-siRNAs similarly generate a concentration gradient that divides the developing leaf into a ...

Scientists at CSHL discover mobile small RNAs that set up leaf patterning in plants

... leaves but traffic from this source to form a concentration gradient across each leaf. This graded ... a defined location, their movement establishes a concentration gradient that patterns a developing tissue such ... in plant leaves, ta-siRNAs similarly generate a concentration gradient that divides the developing leaf into a ...

Plant soybean early to increase yield

... (late-May and early-June) soybean. Oil concentration was higher at early plantings and protein concentration was higher at late planting dates. As the ... during R6 soybean growth stage (full seed) oil concentration increased and ...

How chromosomes meet in the dark -- Switch that turns on X chromosome matchmaking

... in the system reached a critical threshold - a concentration of around 0.1 mg per millilitre or less. Below ... X inactivation. However once the threshold concentration is reached it produces a tipping point or thermodynamic switch. That particular concentration of CTCF was suddenly enough to ensure that the ...

A little wine boosts omega-3 in the body: Researchers find a novel mechanism for a healthier heart

... and sudden cardiac death, thus their high blood concentration is definitely good for our health. Now ... drink a day for women and two for men, had higher concentration of omega-3 fatty acids in plasma and red blood ... association between wine drinking and increased concentration of omega-3 fatty acids have been observed says ...

Caltech scientists develop 'barcode chip' for cheap, fast blood tests

... used the chip to measure variations in the concentration of human chorionic gonadotropin (hCG), the hormone produced during pregnancy. "The concentration of this protein increases by about 100,000-fold ... wanted to show that we could capture that whole concentration range through a single test," Heath says. The ...

James Briscoe awarded 2008 EMBO Gold Medal

... that cells integrate time of exposure and concentration of a morphogen to subsequently mount a graded ... cells to integrate the time of exposure and the concentration of the morphogen Shh to subsequently mount a ... types of nerve cells. "The discovery that concentration is effectively converted into time is a major ...

Comparing apples and pears

... control of oxygen levels. The correct oxygen concentration is related to the complex mechanisms of gas ... fermentation in the fruit. The correct oxygen concentration is related to the complex mechanisms of gas ... now used in computer models to calculate oxygen concentration in individual cells of fruit tissues. "It is ...

CO2 increase in the atmosphere augments tolerance of barley to salinity

... in salty surfaces on the Earth and in the concentration of CO 2 in the atmosphere. However, this higher ... this growth decrease of the plants caused by high concentration of salts. However, research to date differs as ... on Climate Change (IPCC) predicts that the CO 2 concentration in the atmosphere at the end of the XXI century ...

ESF's European ice core project EPICA receives prestigious Descartes Prize

... alia, that the recent rise in greenhouse gas concentration is beyond any historical comparison, leading to ... Due to human made emissions today, methane concentration is 150% higher than the natural methane concentration would be, said Fischer. The carbon dioxide ...

New technique captures chemical reactions in a single living cell at unprecedented resolution

... spectroscopy to work, a relatively high concentration of biomolecules and a large volume of solution is ... peak of the gold particle." A relatively small concentration of the molecule is needed to create these quenching dips, so instead of a concentration of millions of molecules, researchers can get by ...

Reveal the enemy

... Using this biosensor, the researchers were able to detect a bacterial concentration equivalent to one salmonella bacterium in 5 mL of medium. Quantitative measurements were possible down to a concentration of about 1000 salmonella per milliliter. This biosensor is specific: it ...

Study by NTU professors provides important insight into apoptosis or programmed cell death

... there is a high distribution of RanGTP in the nucleus and a low concentration of RanGTP in the cytoplasm (the body enveloping the cell's nucleus). It is ... proteins and other molecules into and out of the nucleus. Hence, when the concentration of RanGTP is reduced in the nucleus, the RanGTP gradient collapses and the ...

A matter of density, not quantity

... sensing, which cells use to "sense" cell density, is triggered when the concentration of certain signaling compounds generated by the bacteria reaches a ... of a released signal and then change their behavior when the signal concentration exceeds a threshold level. Traditionally, quorum sensing is thought to ...

Ozone depletes oil seed rape productivity

... High ozone conditions cause a 30% decrease in yield and an increase in the concentration of a group of toxic compounds within oilseed rape plants. Combined with ... by Maarten De Bock of the University of Antwerp, showed changes in the concentration of glucosinolates, a family of compounds involved in plant defences ...

Ozone depletes oil seed rape productivity

... High ozone conditions cause a 30% decrease in yield and an increase in the concentration of a group of toxic compounds within oilseed rape plants. Combined with ... by Maarten De Bock of the University of Antwerp, showed changes in the concentration of glucosinolates, a family of compounds involved in plant defences ...

Phthalic symbol

... type of ceramic honeycomb support. They then measured the before and after concentration of phthalate in a simulated wastewater sample. Initial concentration was 100 milligrams per liter which fell to less than 1.0 milligram per ...

Powe Award supports research on how enzymes enable the pathogenicity of 2 human disease organisms

... to replicate. The level of free iron in humans is lower than the required concentration for these pathogens to survive. To overcome this limitation, these ... The iron-siderophore complex is then taken by the microbes, increasing the concentration of iron to satisfy their metabolic needs and enable infection. The ...

From the glass to the brain in 6 minutes

... The harmful effect also sets in quickly. During the experiment, the concentration of substances such as creatine (energy metabolism), which are attributed with protecting cells, decreases as the concentration of alcohol increases. Choline, a component of cell membranes, was also ...

Protein regulates movement of mitochondria in brain cells

... buffer. One of the mitochondria's functions is to help control the concentration of calcium in the cell, which the organelles can rapidly absorb and store. ... This creates a "normal" state of hypoxia in the brain. However, the concentration of oxygen in the brain can drop even further in instances such as a ...

Researcher: Lasers used to detect melamine in baby formula

... spectrum was compared to that of the unadulterated formula, showing the concentration of melamine in the sample. "The melamine structure is very different ... tries at higher concentrations, Mauer and the students kept lowering the concentration of melamine until they reached one part per million. ...

Scripps research scientists 'watch' as individual alpha-synuclein proteins change shape

... To coax the protein to change shapes, the researchers increased the concentration of a soapy solution that mimics the lipids found in different nerve cell ... Deniz says. "It starts off in an unfolded state, and as we increase the concentration of the lipid mimics, the protein reacts to what is in effect a different ...

Scientists discover why teeth form in a single row

... outside of the normal row, but also that Osr2 is expressed in increasing concentration in the jaw mesenchyme as you move from the cheek toward the tongue in the mouse embryo, the exact opposite of the BMP4 concentration gradient. Osr2 restricts Bmp4 expression to the tooth mesenchyme under the ...

U of Minnesota research finds most road salt is making it into the state's lakes and rivers

... salinity in these lakes in about 50 years. Compare this with a near zero concentration in the 1950s, when road salt application began. The effects could be severe. Continuous levels of chloride concentration (as low as 250 mg/L, the equivalent of one teaspoon of salt in five ...

A crystal clear view of chalk formation

... a dilute solution from which chalk does not normally precipitate. If the concentration of dissolved calcium carbonate is increased, the clusters clump together ... early on. It assumes that the ions do not group together until a certain concentration has been exceeded. If these clusters do not reach a minimum size, they ...

To climate-change worries, add 1 more: Extended mercury threat

... mercury levels in soil spike under trees, averaging four times the concentration in open areas. That's because trees effectively scavenge the poison ... air, or between 549 and 582 parts per million. That is the anticipated concentration in the air in 2050 without new emissions restrictions, Natali said. ...

Pitt research finds that low concentrations of pesticides can become toxic mixture

... can decimate amphibian populations when mixed together even if the concentration of the individual chemicals are within limits considered safe, according ... for more than five decades." For most of the pesticides, the concentration Relyea administered (2 to 16 parts per billion) was far below the ...

'A dinosaur dance floor'

... SALT LAKE CITY University of Utah geologists identified an amazing concentration of dinosaur footprints that they call "a dinosaur dance floor," located in ... sandstone, "but I knew that wasn't the whole story because of the high concentration and because they weren't anywhere else nearby but along that one surface." ...

Waterborne disease risk upped in Great Lakes

... Adding to the risk throughout the region, Patz notes, is the growing concentration of livestock operations where heavy rainfall can wash large amounts of ... rivers and streams that drain into the Great Lakes, the world's greatest concentration of fresh surface water. "It's the perfect storm," notes Patz. ...

Carbon dioxide 'scrubber' captures greenhouse gases

... planet. "At first thought, capturing CO2 from the air where it's at a concentration of 0.04 per cent seems absurd, when we are just starting to do cost-effective capture at power plants where CO2 produced is at a concentration of more than 10 per cent," says Keith, Canada Research Chair in Energy and ...

Growth in the global carbon budget

... rate of emissions continued to speed up, bringing the atmospheric CO 2 concentration to 383 parts per million (ppm) in 2007. Anthropogenic CO 2 emissions ... the oceans carbon uptake was expected to rise with the higher atmospheric concentration of CO 2 , in 2007 it was reduced by a net 10 million tons. Natural land ...

Scientists identify the genes that cause blindness produced by corneal edema

... stops being effective in the control of corneal transparency. Ion concentration The research work has experimentally established the volume and concentration of ions in cells when they make up the endothelial barrier and when they ...

Evolving designer ecosystem sheds light on unintended consequences

... of coastal dead zones. "We were surprised by how frequently the concentration of nitrate in surface waters was determined by the turning of a tap," ... contains a lot of nitrate, when groundwater wells are tuned on, the concentration of nitrate in the canals and streams receiving this water goes up. This ...

Engineers create bone that blends into tendons

... that encodes a transcription factor known as Runx2. They generated a high concentration of Runx2 at one end of the scaffold and decreased that amount until they ... scaffold. The skin cells on the parts of the scaffold containing a high concentration of Runx2 turned into bone, while the skin cells on the scaffold end with ...

New and revised limits ensure safety in the workplace

... in the air that do not have an impact on health (MAK Values), and the concentration of a substance in the body that a human being can be exposed to over a ... to modify germ cells. Following a comparison with the so-called endogenous concentration however, i.e. that formed as part of the body's metabolism, the commission ...

Mussels to determine how much contamination is in the ports

... their waters, the sediments and living creatures therein. They measure the concentration of contaminants and analyse the biological consequences that these cause ... the consequences of the contaminants on the mussels; we measure the concentration of the contaminants received by the mussels", he added. The object of ...

Toxic chemicals found in common scented laundry products, air fresheners

... the air. Results showed 58 different volatile organic compounds above a concentration of 300 micrograms per cubic meter, many of which were present in more than ... to list 26 fragrance chemicals when they are present above a certain concentration in cosmetic products and detergents. No similar laws exist in the United ...

Want a reason to love your lower belly fat? It's rich in stem cells

... in different areas of the body. A major finding was that the concentration of stem cells was greatest in the lower abdomen and inner thighs. Interestingly, stem cell concentration in the lower abdomen was five times greater than in the upper abdomen. ...
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(Date:9/16/2014)... school biology taught us that we inherit certain traits ... you could change how these genes play out by ... diet? That,s exactly what a team of researchers ... proposed through their research of epigenetics research. , ... chemically modifying DNA and histone proteins, which prevent permanent ...
(Date:9/16/2014)... own bacterial identity. That,s the conclusion of University of ... the genetic fingerprints of bacteria on 57 species of ... demonstrates for the first time that host plants from ... very different microbial communities on their leaves," said lead ... the UO,s Institute of Ecology and Evolution who is ...
(Date:9/16/2014)... 10-km diameter chunk of rock hit the Yukatan peninsula near ... force of 100 teratons of TNT. It left a crater ... global earthquakes and volcanism are widely accepted to have wiped ... the mammals. But what happened to the plants on which ... from the University of Arizona reveals that the meteorite impact ...
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