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Tag: "weaken" at biology news

Legal ruling may put endangered species in danger

...rtment of the Interior in March—will substantially weaken the federal Endangered Species Act of 1973. Wolves, grizzly bears, and jaguars are among the species that could be hurt by the new definition, which limits endangered species to those simply "at risk of extinction." The scientists and philosopher...

Remote sheep population resists genetic drift

...t the forces, such as diseases, that may otherwise weaken or kill it. Coltman believes the harsh environment of Haute Island, with its cold winters, scarce resources and grass-borne parasites, has "kept the mouflon on their genetic toes, so to speak." He argues that the extreme conditions on the cra...

Fighting influenza & co. with 40,000 blood samples

...remains in the body for life and could permanently weaken the body's immune system with increasing age, a theory which is being investigated by RWTH Aachen. ...

Brain networks strengthened by closing ion channels

...th ADHD may have genetic changes in molecules that weaken the production of norepinephrine. Treatments for ADHD all enhance stimulation of the norepinephrine receptors. These new data also have important implications for the researchers' studies of more severe mental illnesses like schizophrenia and bipo...

New engineered drug may offer prolonged arthritis relief

...his would be important, he said, because IL1RA can weaken the immune system and make patients more susceptible to infection. Such vulnerability to infection is a particular problem for patients treated for chronic diseases such as osteoarthritis, and this vulnerability suggests the need for a local treatm...

How brain injury leads to seizures, memory problems

...tivity. "When lower levels of the KCC2 transporter weaken the dentate gyrus's ability to act as a gatekeeper," said Dr. Cohen, "neurons become more excitable, and seizures can occur." In addition to its role in inhibiting seizures, the dentate gyrus is also believed to be important in memory formation. ...

U-M researchers take new approach to defeating Gram-negative bugs

...ia coli bacteria, known as a Gram-negative bug, to weaken its defenses. That article appears in the recently released inaugural issue of the American Chemical Society's journal ACS Chemical Biology. Some of the better-known Gram negatives are salmonella, gonorrhea, cholera and meningicoccal meningitis, alo...

How can we protect patients with weakened immune systems from influenza?

... on immunosuppressive drugs, or with diseases that weaken the immune system may be especially vulnerable to influenza, whether the ordinary annual variety or deadlier types. The researchers will study how such patients' vaccine responses change over time: "Some patients may not benefit from flu vaccine at o...

Aggression-related gene weakens brain's impulse control circuits

...previously linked to impulsive violence appears to weaken brain circuits that regulate impulses, emotional memory and thinking in humans, researchers at the National Institutes of Health's (NIH) National Institute of Mental Health (NIMH) have found. Brain scans revealed that people with this version ?especi...

Lack of a key enzyme dramatically increases resistance to sepsis

...n our study, cells containing caspase-12 appear to weaken the activity of caspase-1 that is normally essential for bacterial clearance and sepsis survival." In another finding, researchers showed that both mouse models had similar levels of stress-induced apoptosis or programmed cell death. While caspase...

India's smoking gun: Dino-killing eruptions

... latest in a series of discoveries which appear to weaken the case implicating the Chicxulub impact as the primary player in the Cretaceous-Tertiary (K-T) mass extinction. "As originally proposed by Vincent Courtillot in 1986, the volcanism might be a key player in mass extinctions," said Chenet. "Research...

Computer modeling reveals hidden conversations within cells

...t possible to design anti-cancer drugs that do not weaken patients' immune systems." The computer model comprises 70 equations to account for the behavior of five proteins and three RNA molecules in the "NF-kappaB signaling pathway," which regulates genes involved in cancer, inflammation, immune function a...

Why do aneurysms form? New studies suggest leading role for white blood cells

...es of AAA formation, when the aorta wall begins to weaken and bulge. The researchers think the cells may somehow act in combination with other AAA risk factors such as smoking, high blood pressure and inherited genetic vulnerability. The U-M researchers made the findings in laboratory experiments on mice t...

UCSD medical/bioengineering reseachers show titanium debris satobtage artificial joints

Microscopic titanium particles weaken the bonding of hip, knee, and other joint replacements, according to research published online in Proceedings of the National Academy of Sciences by researchers at the University of California, San Diego (UCSD) School of Medicine and the Jacobs Schoo...

A little stress gives beneficial oomph! to immune system

...s have found that chronic stress may substantively weaken the immune system. Leukocytes are always present in the body, but most remain dormant until an immune response is activated by wounding or infection or until the brain identifies a stressful situation. When that happens, the brain releases hormones ...

New SARS Protein Linked To Important Cell Doorway

... knowledge they need to develop ways to disable or weaken it. "The key to studying novel viruses used to be the ability to isolate the virus and grow it in a culture," notes lead author Daved Fremont, Ph.D., assistant professor of biochemistry and molecular biophysics and of pathology and immunology. "Now ...

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