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Tag: "exposure" at biology news

Many cleaners, air fresheners may pose health risks when used indoors

...eries of 18 experiments to determine the levels of exposure people might be subjected to when using the produc...e the products under ordinary circumstances, their exposure to ethylene-based glycol ethers, formaldehyde and fine particles will normally not reach guideline v...

Brain enzyme treatment relieves memory lapse in Alzheimer's mice

... different parts of the brain. A day after their exposure to the shock, mice with reduced levels of Uch-L1 s... untreated mice persisted 7, 14, and 21 days after exposure to the electric shock, they reported. On the other hand, the mice showed no differences in respons...

Microscopic passengers to hitch ride on space shuttle

...levels of containment, they will pose no threat of exposure to the astronauts. A total of 12 GAPs will fly on the upcoming mission. "Spaceflight has been shown to induce key changes in both human and microbial cells that are directly relevant to infectious disease, including changes in immune system functi...

Sandia work launched on space shuttle shows live cells influence growth of nanostructures

...xamination in electron microscopes and after X-ray exposure in Argonne National Laboratory's Advanced Photon Source, where the accelerating voltage ranges from one to 20 keV, says Brinker. Genetic modification done cheap It is noteworthy that the entrapped cells easily absorb other nano-components inserte...

Cigarette smoke blocks cell repair mechanism, University of Florida study shows

...tudied how breast epithelial cells transform after exposure to the chemical benzo[a]pyrine, which is found in tobacco smoke, called the UF findings very interesting. "We found significant alteration in many of the chromosomes in these cells induced by the effect of benzo[a]pyrine," Russo said. "We were the ...

New study reveals components of cocoa may enhance the appearance of the skin

...bited a reduction in the redness of skin following exposure to artificial sunlight. The authors of the study believe the skin benefits of cocoa flavanols may be due in part to an improvement in blood flow to the skin. Consistent with previous studies that demonstrated significant improvements in vessel funct...

Global study shows all tobacco bad for the heart

...t attack. Even those with relatively low levels of exposure of eight to 10 cigarettes a day doubled their risk... years after quitting. The team also found that exposure to second hand smoke increased the risk of heart attack in both former and non-smokers. The findings...

Nicotine exposure during development leads to hearing problems

...nd colleagues from UC Irvine, showed that nicotine exposure during the equivalent of a human's third trimester...t related to harmful chemicals in cigarette smoke, exposure to nicotine appears to be enough to cause serious problems on its own, in terms of brain development...

Heal thyself: Systems biology model reveals how cells avoid becoming cancerous

...tt McCuine and Maya Agarwal analyzed the effect of exposure of yeast cells to MMS (methyl-methanesulfonate), a chemical known to cause DNA damage in a manner similar to that of certain mutagens in tobacco smoke. The alkylation injury caused by MMS results in small kinks in the otherwise smoothly curving doubl...

Combating anthrax: Results of study published this month as researchers look for a better vaccine

... whether the vaccine is given before or soon after exposure to anthrax spores." Gorse said the study was able to answer some important questions about this candidate vaccine. "We were able to demonstrate in this study that the investigational anthrax vaccine produced an immune response that justifies furthe...

Light guides flight of migratory birds

...exposed birds in "funnel cages". This is so, after exposure to the cue conflict, the birds' directional preferences could be recorded; songbirds in migratory condition leave tracks or scratches on the sides of the funnel as they attempt to take flight in the migratory direction. A problem arises, however, bec...

EGF receptor activation prevents microbes from going more than skin deep

...le wounding of the skin surface, illustrating that exposure to invading microbes is not the sole trigger for the immune response in skin. The authors went on to show that AMP was produced through activation of the epidermal growth factor receptor (EGFR), which is known to play a role in the normal wound-heal...

Combination therapy with a monocloncal antibody and a vaccine leads to tumor rejection

...Tregs and Teff cells to proliferate in response to exposure to self-antigen. Interestingly, combination of CLT...tion. Importantly, the authors report that chronic exposure to anti- CLTA4 or to the Gvax/anti-CTLA4 combination therapy does not deplete the number of Tregs, n...

Genetic snooze button governs timing of spring flowers

... of biennial plants, which require long periods of exposure to the cold to initiate flowering in the spring. W...s a mystery until Amasino and his group found that exposure to prolonged cold triggered a molecular process that effectively silenced the genes that repress flo...

Defense peptide found in primates may block some human HIV transmissions

...hibitor of HIV-1 even after 100 days of continuous exposure to human cells in a laboratory setting. Cole and his team are encouraged that only minimal resistance of the virus occurred during that time. Higher resistance levels make it more difficult to develop drugs to fight the virus because doses must be in...

Bird brains shrink from exposure to contaminants

... of Alberta research--the first proof that natural exposure to a contaminant damages the brain of a wild anima...Behavioural Brain Research, strongly suggests that exposure to environmental levels of DDT causes significant changes in the brains of songbirds. Previous stu...

Airborne mold spores increase kids' risk for multiple allergies

University of Cincinnati (UC) researchers say exposure to a certain group of fungal spores--abundant in t...rborne fungal spores. The UC-led study showed that exposure to specific airborne fungal spores may increase allergic reactions and others could help reduce them...

Exxon Valdez oil found in tidal feeding grounds of ducks, sea otters

... "This study shows that it is very plausible that exposure to Exxon Valdez oil is having a material impact on many shore-dwelling animals and is contributing to their slow recovery in some parts of Prince William Sound," Short says. "Sea otters, for instance, have yet to re-inhabit Herring Bay, the most oile...

Prozac's target revealed

...influenced by long-term, Mission-to-Mars levels of exposure to a particular kind of damaging radiation that's prevalent in space. ...

Quick -- what’s that smell?

... paradigm using trained mice to ask whether longer exposure to an odor would result in more accurate identification of that odor. The results indicated that the mice needed extra time to accurately identify more complex odors. "The well-trained mouse needs almost half a second to solve a difficult olfactor...

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