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Absorption in Biological News

Case Western Reserve researchers looking at light-induced toxins in air and water

... physical and chemical consequences of sunlight absorption by these pollutants in the environment. In ... environment. Consequently, understanding how the absorption of light transforms these compounds holds the key ... the degradation of these compounds by light absorption at the molecular level, we might be able to use ...

American Chemical Society's Weekly PressPac -- Aug. 13, 2008

... for years that grapefruit juice can increase the absorption of certain drugs with the potential for turning ... opposite effect by substantially decreasing the absorption of other drugs, potentially wiping out their ... fruit juices substantially decrease the oral absorption of certain drugs undergoing intestinal uptake ...

Keeping an eye on the surroundings

... making it possible to directly measure the absorption of biomolecules in aqueous buffers on the ... team recently demonstrated that THz-range absorption spectroscopy is a sensitive method for the ... each other differently than in pure water. Their absorption of THz radiation at certain frequencies is thus ...

Protein transports nutrients believed to protect against eye disease

... specific binding protein would be involved in the absorption process, Harrison said. The scientists worked ... the SR-B1 protein also blocked the cells' absorption of the two xanthophylls by between 41 percent and 87 percent compared to absorption when SR-B1 activity was not inhibited. "It's ...

New clues to how proteins dissolve and crystallize

... has allowed the group to perform near-edge x-ray absorption fine structure (NEXAFS) measurements on liquid ... to promote the electron. Therefore, the x-ray absorption spectra tell you about the relative binding ... By using liquid microjet technology and x-ray absorption spectroscopy to characterize how sodium, ...

A genetic cause for iron deficiency

... had any condition that might interfere with iron absorption or cause chronic blood loss, the most common ... copy of TMPRSS6 have subtler alterations in iron absorption that might not otherwise have come to the ... too much hepcidin, a hormone that inhibits iron absorption by the intestine. Normally, hepcidin is produced ...

A stronger heart with flavonoids

... to study a complex mechanism such as that of absorption of food flavonoids. That is why we need to turn ... adds that chronic consumption and effective absorption of anthocyanins rendered the rats more resistant ... and rats, for example in terms of flavonoid absorption and metabolism. Human volunteers are the ...

New decontamination system kills anthrax rapidly without lingering effects

... of each phosphor was measured against the DNA absorption curve. This curve shows the optimal wavelengths ... UV emission didnt fall completely under the DNA absorption curve, the relative killing efficiency was ... that provides increased coverage of the DNA absorption curve. With increased efficiency, UV-C panels ...

Story ideas from the Journal of Lipid Research

... experienced far larger decreases in cholesterol absorption and consequently had increased cholesterol ... FXR target to engineered mice with defective bile absorption and found that treatment increased the FGF15 ... the diarrhea but doesnt solve the underlying absorption problem. CORRESPONDING AUTHOR: David ...

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

... challenge by improving upon conventional optical absorption spectroscopy, a technique by which light is ... and cell death that has several optical absorption peaks of around 550 nanometers. The absorption spectra of a molecule can change based upon the ...

Major funding to help cut CO2 emissions

... how the surfaces of materials can be chemically altered to enhance CO 2 absorption or 'soak up' rates. This may be an alternative to chemical absorption using amines in post-combustion capture systems. The other participants ...

For fats, longer may not be better

... inflammation. Long-chain fats, it turns out, promote increased intestinal absorption of pro-inflammatory bacterial molecules called lipopolysaccharides (LPS). ... amounts of dietary oleic acid, but not butyric acid, promoted significant absorption of LPS into the blood and lymph nodes and subsequent expression of ...

Research shows Brazilian acai berry antioxidants absorbed by human body

... of the Journal of Agricultural and Food Chemistry . Showing the berry's absorption in humans is important because it is known to contain numerous ... consumption, she said. Both acai pulp and acai juice showed significant absorption of antioxidant anthocyanins into the blood and antioxidant effects. The ...

Cranking up the volume

... of marine mammals. Ocean chemists have known for decades that the absorption of sound in seawater changes with the chemistry of the water itself. As ... that they have to live with. There are no long-term records of sound absorption over large ocean areas. However, the researchers cite a study off the ...

Prolonged effects of a warming anomaly on grasslands

... Reno greenhouse not only depressed plant growth and suppressed land carbon absorption in the treatment year but also resulted in prolonged suppression of plant growth and carbon absorption in the following year. ...

Got carrots? Vegetables may have bone to pick as calcium providers

... Morris explained. The study group also was evaluated for their normal absorption rate to compare with the rate of absorption from the calcium-enhanced carrots, he said. He said both men and women ...

University of Hawaii at Manoa researchers reveal ocean acidification at Station ALOHA

... tremendous amounts of the greenhouse gas carbon dioxide (CO 2 ) into the atmosphere, significantly impacting global climate. Were it not for the absorption of CO 2 by the oceans, the alarming growth of atmospheric CO 2 concentration would be substantially greater than it is. However, this beneficial ...

DuoCort: New chronotherapy for adrenal insufficiency

... serum cortisol profile after single-dose administration that mimics the natural secretion pattern of cortisol. The new DuoCort therapy showed no absorption failure allowing it to be safely used in patients with adrenal insufficiency. Data from a subsequent phase II/III trial in patients with primary ...

Broecker: 'What we need are tougher measures against climate change'

... study of air-sea interaction back in the 1970s, focusing on the exchange of gases such as CO 2 . And he was also the first to explore how the ocean's absorption of atmospheric CO 2 gives it a key role in global temperature regulation. More recently, his research has paved the way for another major ...

Microtest Labs Adds Dissolution Testing to its Suite of Analytical and Stability Testing Services

... To compare one dosage form to another (different formulations, different processes, analysis of competitor's samples) To estimate release and absorption rates in humans after an in vitro -- in vivo correlation is established Dissolution is a sample preparation technique. Samples ...

Notre Dame researchers describe new tool for evaluating 'managed relocations'

... managed relocation is only one strategy under consideration for addressing climate change. Others include fertilizing the oceans to increase their absorption of greenhouse gases and preserving the genetic diversity of threatened species in seed banks. Their hope is the tool will provide a useful analysis ...

Scientists urge global action to preserve water supplies for billions worldwide

... the form of black carbon (essentially soot), are already disrupting natural supplies of water by raising air temperatures and by increasing the light absorption of snow and ice as pollutants darken the frozen surfaces. Participants at the workshop held May 4-6 at Scripps Oceanography's Robert Paine Scripps ...

Pliable proteins keep photosynthesis on the light path

... Beatty. "We were forced to think in new ways to explain the surprising results, which led to some nice insight." Lin carefully measured the light absorption spectra for the naturally occurring magnesium reaction center and compared it to the mutant reaction center that was replaced with zinc ...

Lyncean Technologies Inc. receives $1.2 M from NCRR to develop new imaging technique

... in Switzerland ( http://journals.iucr.org/s/issues/2009/01/00/issconts.html ). DPCI uses a pair of micron-scale gratings to create three images: an absorption image enhanced by the x-ray beam quality, a second image sensitive to the phase of the x-ray wave front, and a third image sensitive to the local ...

DOE funds bio-inspired solar fuel center at Arizona State

... chemistry and biochemistry who is director of the new center said, "This grant will allow us to put together a complete system that starts with the absorption of sunlight and ends with the creation of a clean fuel, such as hydrogen." "It also will provide resources to educate students at all levels ...

Orientation of antenna protein in photosynthetic bacteria described

... sandwiched in between a larger antenna and a complex called the reaction center, where all the electron transfer chemistry takes place. Most of the absorption of light is carried out by a complex called the chlorosome that then transfers the energy to the trimeric protein that in turn transfers to the ...

Distinguishing single cells with nothing but light

... with IRAM does not harm or inhibit normal cell functionality. This is because the wavelength of the light can be precisely calibrated to minimize absorption by the cells. The near-infrared spectrum has proven particularly optimal for allowing almost all of the light to pass through the cells. With the ...

AGU journal highlights -- March 25, 2009

... and the driving agent in acid rain, is increasing in the atmosphere due to industrial activities, the authors expect that this mechanism of water absorption by acid-coated soot significantly influences cloud formation. Title: Formation of highly hygroscopic soot aerosols upon internal mixing with ...

Gladstone scientists reveal key enzyme in fat absorption

... of Mgat2 may reduce the uptake of fat in the small intestine and delay its entry into the blood. This process may dissociate fat from carbohydrate absorption and insulin secretion and ultimately lower the amount of fat stored and used. How this happens is not clear. One possibility is that the absorbed ...

New 'pollution radar' developed to provide unprecedented picture of urban smog

... this challenge." During 2009 two new CompAQS instruments are being constructed and configured for use as a ground-based Differential Optical absorption Spectroscopy (DOAS) system by the University of Leicester, in collaboration with partners at Surrey Satellite Technology Ltd. These instruments will ...

Oh, my aching back: Give me a shot of ozone

... invasive surgical diskectomy puts you on a path where you may be left with too little disk. Taking out a protruding disk may lose the shock absorption that naturally resides between them in the spine," said Murphy, who predicts this procedure will become standard in the United States within the next ...

UConn chemists find secret to increasing luminescence efficiency of carbon nanotubes

... research, Papadimitrakopoulos says. Carbon nanotube emissions are not only extremely sharp, but they also appear in a spectral region where minimal absorption or scattering takes place by soft tissue. Moreover, carbon nanotubes display superb photo bleaching stability and are ideally suited for ...

Low levels of vitamin B12 may increase risk for neural tube defects

... Division of Epidemiology, Statistics, and Prevention Research. He added it is advisable for women with digestive disorders that interfere with the absorption of foods to consult a physician before getting pregnant, to make sure they are receiving adequate amounts of B12. Dr. Mills explained that ...

Understanding natural crop defenses

... time to shade. Plants sense the presence of other plants in their neighborhood by the relative increase in incoming far-red light resulting from absorption of red light by canopy leaves and reflection of far-red light from neighboring plants. "When the major photoreceptor for shade avoidance detects ...

Lowering your cholesterol may decrease your risk of cancer

... high fat/high cholesterol "Western" diet. They found that high cholesterol levels promoted tumor growth and that Ezetimibe (Zetia), which blocks the absorption of cholesterol from the intestine, could prevent this increased tumor growth. Ezetimibe also blocked a cholesterol-mediated increase in ...

Carbon accounting from atmospheric measurements -- the aircraft perspective

... an area that absorbs CO2 - after subtracting estimated fossil fuel emissions from 2004-2006. Researchers also found that the highest uptake or absorption of CO2 occurs in the Midwest and the Southeast. This agrees with estimates of crop uptake, which proves to be a significant part of the US ...

Research exposes the risk to infants from the chemicals used in liquid medicines

... Consultant Paediatrician at the University Hospitals of Leicester NHS Trust, revealed that the chemicals added to medicines to improve their taste, absorption and to prolong their shelf-life could be potentially harmful to very small babies. The chemicals generally used are ethanol, sorbitol and Ponceaau ...

Novel technique changes lymph node biopsy, reduces radiation exposure

... attractive because their properties can be tuned to give optimal contrast and gold is non-toxic. "By controlling the synthesis, we can move the absorption peak for the nanocages to a region that allows them to be imaged deep in tissue. We can also attach biomolecules to the surface of the nanocages so ...

Novel technique changes lymph node biopsy, reduces radiaiton exposure

... attractive because their properties can be tuned to give optimal contrast and gold is non-toxic. "By controlling the synthesis, we can move the absorption peak for the nanocages to a region that allows them to be imaged deep in tissue. We can also attach biomolecules to the surface of the nanocages so ...

Researchers first to 'see' reactive oxygen species in vital enzyme

... choline oxidase. The researchers accomplished their work by combining two popular synchrotron techniques x-ray diffraction and optical absorption spectroscopy into one setup. By shining beams of powerful x-rays and visible light on the same region of the crystallized flavoprotein, two ...
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