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Tag: "danger" at biology news

Scientists observe how a close bond activates the immune system

...tigen and its source in the body. Is the antigen a danger or simply a harmless food protein? The interrogation may last hours, and if the antigen is deemed a threat the T cell starts multiplying, eventually producing thousands of copies of itself. These T cell clones are capable of killing invaders outrigh...

Gene controls whether fear is a factor

... a decreased memory for fear and fail to recognize danger in innately aversive environments." By contrast, he added, the mice depleted of stathmin perform normally in a test of spatial learning. Fear reactions represent a spectrum of behaviors that vary from those that are inborn to those instilled throug...

Katrina floodwaters not as toxic to humans as previously thought, study says

...cially copper and zinc, and could pose a long-term danger to the area's aquatic life, which are more sensitive to the metals than humans. Their findings will appear in the Oct. 11 online issue of the American Chemical Society?s journal Environmental Science & Technology. "What we had in New Orleans w...

Students discover 11,000 year old remains of Irish Elk

...turned out to be an antler." As the block was in danger of imminent collapse, which would have crushed the antler, Dr Davey arranged for a team to remove it almost immediately. The antler is now being cleaned, examined and re-constructed by Dr Philippa Tomlinson from the Centre for Manx Studies who is a s...

Animal models show that anabolic steroids flip the adolescent brain's switch for aggression

...nces) and make young people "pop off" for years, a danger to themselves and to others. Melloni and others researchers also are concerned that drug use during a critical window in brain development can change their wiring for good. He says, "Because the developing brain is more adaptable and pliable, stero...

'Bad' enzymes may wear white hats after stroke

...earch seeks ways to inhibit MMPs to minimize their danger ?but this new study shows that a different approach may be required in the long run. "We have mostly thought of MMPs as being 'bad,'" said senior author Eng H. Lo of the Neuroprotection Research Laboratory at Massachusetts General Hospital, Wang's ...

Weizmann Institute suggests that immune cells help to maintain cognition and brain cell renewal

...omponents("autoimmune" cells) are viewed as a real danger as they can induce autoimmune diseases. Thus, although autoimmune cells are often detected in the healthy individual, their presence there was perceived as an outcome of the body's failure to eliminate them. But Schwartz's group showed that these au...

Flu not the only germ threat this time of year

...n, pediatricians have long known that the bug is a danger to small children, affecting hundreds of thousands of children annually as the biggest cause of bronchiolitis and pneumonia among infants and children under 1 year of age. For more than a decade Falsey and Walsh, who are infectious disease experts a...

Revolution in the fight against cancer & viruses

...al agent, Professor Williams had shown there was a danger siRNA-based drugs could cause a dangerous inflammatory response. Professor Williams and his team have now discovered the physical structure of siRNA are key to creating effective anti-cancer and anti-viral drugs. This will allow both the development...

Predators prefer to hunt small-brained prey

...ing clever should help individuals avoid or escape danger ?the larger-brained chimpanzees rarely feature in the diets of predators." "Some animals' ability to avoid being eaten by predators may be a contributing factor to the evolution of large brains across some species, adding to conventional theories ...

AIDS study challenges conventional treatment guidelines for HIV patients

...uickly that person's CD4 cell count will reach the danger level at which treatment for HIV becomes most critical. Current clinical practice, based on previous work from other groups, is to focus on both the current CD4 count and the viral load to estimate how rapidly a person's CD4 cell count will decrease....

Increase in carbon dioxide emissions accelerating

... each year over the past 50 years," he says. "A danger is that the land and oceans might take up less carbon dioxide in the future than they have in the past, which would increase the rate of climate change caused by emissions." The latest findings on greenhouse gas emissions are supported by measurem...

New finding points way to foiling anthrax's tricks

...be separated from the bacteria and studied without danger of infection. Using these anthrax bacteria extracts, Abergel and Hoette isolated the two siderophores, bacillibactin and petrobactin, and showed that siderocalin tightly binds bacillibactin, preventing it from capturing iron from human cells. Howe...

Detecting explosives with honeybees

...American military troops abroad and is an emerging danger for civilians worldwide. By studying bee behavior and testing and improving on technologies already on the market, Los Alamos scientists developed methods to harness the honey bee's exceptional olfactory sense where the bees' natural reaction to ne...

A new understanding of how cells defend themselves against bacterial pore-forming toxins

...rity force inside the cell, detecting a variety of danger signals such as bacterial RNA or bits of bacterial flagellin. The inflammasomes join together and activate a protein, caspase-1, that in turn triggers an inflammatory response. Van der Goot and her colleagues found that in addition to its normal r...

Commercial fishing causes dangerous fluctuations in fish populations

...s fluctuations in fish populations leaving them in danger of total collapse, says new research published tod...ts to replenish their numbers, there is always the danger that some kind of environmental factor will devastate the recruits in one season. This would leave t...

For crickets, parasitic flies can stop the music

...iversity of Florida zoologists have found that the danger posed by the flies has apparently affected when crickets sing. In experiments with Southeastern U.S. field crickets, known scientifically as Gryllus rubens, they discovered that considerably fewer male crickets sing in the autumn when the parasitic f...

New HIV statistics indicate increasing toll of AIDS on African American community

...ny Primm, M.D., NMAC's chair emeritus. "There is a danger that we view AIDS as a problem that only affects Africa when it remains a real and growing danger in our own backyard. That kind of complacency is killing people and it has to stop. This plan of a...

Male circumcision reduces HIV risk, study stopped early

... are not traditionally circumcised," he said. "The danger is that unqualified practitioners will fill a niche by providing circumcision, but with much higher complication rates." An estimated 30 million people in Africa are infected with HIV/AIDS and more than 90 percent of HIV infections in adults resul...

Novel regulatory mechanism identified for key tumor suppressor p53

...maged DNA to self-destruct so they are no longer a danger to the body. This powerful ability of the p53 protein to shut down cell division and induce cell death points to why the availability of a repressive mechanism such as the one outlined in the new study might be crucial for cellular survival. "You...

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