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Tag: "alters" at biology news

Undergraduate research shows leaderless honeybee organizing

...tead is a form of “modulatory communication” that alters existing bee behaviors (making bees perform their jobs more actively, perhaps) or changes bees response to other signals. Pierce and Schneider have documented in their current paper how workers use the vibration signal to prepare the queen for sw...

Scientists see DNA get 'sunburned' for the first time

... occasionally it triggers a chemical reaction that alters the DNA's molecular structure. Previously, scientists believed that the longer a DNA molecule was excited by UV energy, the greater the chance that it would sustain damage. So long-lived excited states were thought to be more dangerous than short-...

Studies force new view on biology of flavonoids

...w is that flavonoids are highly metabolized, which alters their chemical structure and diminishes their ability to function as an antioxidant," said Balz Frei, professor and director of the Linus Pauling Institute. "The body sees them as foreign compounds and modifies them for rapid excretion in the urine a...

Manipulating nature: Scientists query wildlife birth-control method

... form of genetic engineering: "Immunocontraception alters the gene pool of the targeted species because those animals who are unresponsive are genetically unusual individuals," he says. "The job of the immunological system is to combat disease-causing organisms. But there is a danger that the selected m...

Gene that makes people 'early to bed and early to rise' demystified

...the amino acid change associated with FASPS, which alters the charge of the residue, alters the ability of PER2 to regulate its own transcription. PER2 presumably manages such regulation throu...

Prenatal cocaine's lasting cellular effects

...f dopamine receptors in certain brain cells, which alters their ability to function normally. Though this effect has not yet been assessed in cocaine-exposed children, the findings give researchers a place to start looking. "The hysteria surrounding the 'crack baby' was sort of overblown," said Stan...

Applied scientists create wrinkled 'skin' on polymers

...f a closed zipper. "Irradiation by the ion beam alters the chemical composition of the polymer close to its surface and forms a thin stiff skin which wants to expand," explains Vaziri. "The consequent mismatch between the mechanical strain of the generated stiff skin and the underlying polymeric substrat...

Parasite infection may benefit MS patients

...tions may affect the immune response in a way that alters the course of MS. The study was published in the January 2007 issue of Annals of Neurology ( http://www.interscience.wiley.com/journal/ana ), the official journal of the American Neurological Association. Previous studies involving animals have sho...

Brain networks strengthened by closing ion channels

...evidence of a molecular mechanism that dynamically alters the strength of higher brain network connections. This discovery may help the development of drug therapies for the cognitive deficits of normal aging, and for cognitive changes in schizophrenia, bipolar disorder, or attention deficit hyperactivity ...

Microfluidic chip helps solve cellular mating puzzle

...en a prospective partner picks up this "scent," it alters its shape and sends a projection toward the source of the pheromone, leading to a cellular merger. This mating process is regulated by proteins inside the cell called mitogen-activated protein kinases, or MAPKs, through a chain of chemical reactions....

Virtual duck bills demonstrate species coexistence

... upper and lower bill while they are feeding. This alters the size of the gap between the lamellae on the upper and lower bill, which allows them to determine the size of the particles they filter and ingest. By avoiding particle sizes that contain too much detritus, ducks increase their foraging efficiency...

How fish mend a broken heart

... muscle. A subset of those epicardial cells then alters their identity, invading the wound and providing essential new blood vessels to the growing muscle. They further found that the two-part regeneration process is coordinated by so-called "fibroblast growth factor" (Fgf) signals. Fgf signals are know...

Global changes alter the timing of plant growth, scientists say

...thesis in Santa Barbara, Calif. "If climate change alters the timing of plant activity, then it could have a domino effect, impacting the feeding, breeding or migration patterns of the animals that rely on particular plant species." Cleland's co-authors include Nona R. Chiariello, research coordinator of ...

Gene therapy inhibits epilepsy in animals

...ater seizure development. To carry the gene that alters the expression of the protein, they used an adeno-associated virus vector, injected into the rats' brains. The researchers later injected the rats with pilocarpine, a drug that causes status epilepticus (SE), a convulsive seizure, shortly after injec...

Fruit fly study identifies gene mutation that regulates sensitivity to alcohol

...ave discovered a gene mutation in fruit flies that alters sensitivity to alcohol. The findings, reported in the October 6 issue of the journal Cell, may have implications for human studies seeking to understand innate differences in people's tolerance for alcohol. The research was supported by the National ...

Paying attention sets off symphony of cell synchronization

...activity were used to show precisely how attention alters brain activity. The team of psychologists and neuroscientists used a new strategy for understanding the mechanisms whereby sustained attention makes us process things more effectively, literally making the world come into sharper focus. "When you ...

Smoking changes brain chemistry

Chronic smoking affects nerve cells and alters the chemical makeup of the brain, according to research presented today at the annual meeting of the Radiological Society of North America (RSNA). "This is the first imaging study to focus on the relationship between brain metabolites and nicotine ...

Stomach receptor for H. pylori discovered

...cells. This binding induces an immune response and alters the morphology and behavior of the epithelial cell...nderbilt University School of Medicine. "H. pylori alters acid production and can lead to increased acid outputs which causes peptic ulcer disease. The means ...

Sticky surfaces turn slippery with the flip of a molecular light switch

...ve created an "optically switchable" material that alters its surface characteristics when exposed to ultraviolet (UV) light. The new material, which is described in the June 19 issue of the journal Angewandte Chemie International Edition, could have a wide variety of applications, from a protein filter for...

Brittle prions are more infectious

...e insoluble prion protein is not deadly; it merely alters a cell's metabolism. Prions propagate themselves by division of the insoluble clumps to create "seeds" that can continue to grow by causing aggregation of more proteins. In earlier studies, Weissman and his colleagues had discovered that the same pr...

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