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Tag: "stress" at biology news

Taking a bite out of a fellow worker helps wasps recruit new foragers

...raging slowed down and stopped completely, placing stress on the colony because materials the colony needs, primarily food, are not coming in. So the colony needs to recruit new workers to make up for the loss," O'Donnell explained. On the final day observers watched each colony, noted the behavior of the...

For one Stanford doctor, the beat goes on during open-heart surgery

...y failure. Because the body doesn't have the added stress of being put on a heart-lung machine, beating-heart surgery can reduce these risks, and does so particularly well among such high-risk groups as the elderly and, surprisingly, women, Ihnken said. "For reasons not well-understood, women don't do as w...

Infections could contribute to adult brain tumours

...ensely populated areas." However, the researchers stress that people cannot 'catch cancer'. Infections are only likely to trigger cancer in a very small number of individuals who are already genetically susceptible to the disease. The team looked at data from the Eindhoven Cancer Registry. They analysed...

Activation of a protein solidifies fear memory in the brain

...es in psychiatric disorders such as post-traumatic stress disorder, depression and drug addiction. "Additionally, the ability to strengthen memories by retrieval has important implications for psychotherapies," she said. ...

How the brain learns to become addicted

...st Roy Wise commented that "Inasmuch as arousal or stress can trigger drug-seeking in drug-free animals, the neuroadaptations discovered by the Bonci group are important not only for how rewarding the drug is after an animal starts taking it, but, perhaps more importantly, for how likely the animal is to in...

Spousal illness can trigger partner death

...of a spouse. "Spousal illness or death may impose stress on a partner or deprive a partner of social, emoti... with age. Although illness and death both create stress and have a negative effect on social support for a partner, these results operate over various time ...

How 'hot' emotional brain interferes with 'cool' processing

...ding how people with depression and post-traumatic stress disorder cope with traumatic events and memories. It is known that people with such problems are far more affected by emotional distraction. Development of new drugs to alleviate, for example, the haunting memories of PTSD sufferers will be aided b...

Researchers test new way to quit smoking

...addictive substance. It has been proposed that the stress a person undergoes when giving up cigarettes, coupled with the burden of remembering to use alternative methods of nicotine delivery, is too much too soon. "If a person first becomes used to the patch or gum, it might make the transition to being sm...

Alternatives to the use of nitrate as a fertiliser

...chanisms of various plant species arising from the stress produced as a result of the use of exclusively amm...s. In another part of the study the nature of the stress produced in plants by the use of ammoniacal fertilisers is investigated. The high concentration of a...

Researchers unravel DNA tangles and enzyme seamstresses

... very striking." While Chan and his collaborators stress their results represent only a quantitative proof of concept, they do see the finding as particularly relevant for understanding diseases such as cancer, where cell multiplication goes haywire. "Besides further elucidating the principles we found, wh...

When good DNA goes bad

...ys Vasquez. "For example, if certain types of cell stress lead to breaks, we might be able to find ways to reduce those stresses and prevent breaks." ...

It's in the genes: Study opens door to new treatment of the blues

...ch as social phobia, depression and post-traumatic stress disorder, and that will allow us to find better ways to treat these disorders," Bolanos said. "This study is significant because it gives us an animal model of the disorder and opens up new areas of study." In the experiment, the researchers subject...

Removing DNA repair gene causes metabolic syndrome

...NA damaged by free radicals that trigger oxidative stress on cell molecules. As a consequence of these studi...the repair-deficient mice. "If you have oxidative stress inside the cell, then the bases in the DNA can become damaged, and the responsibility of this whole ...

Two NIH initiatives launch intensive efforts to find roots of common diseases

...disease indicators like inflammation and oxidative stress that are known to be influenced by environmental toxins. The National Center for Biotechnology Information, a part of the National Library of Medicine at NIH, will develop databases to manage the vast amount of genetic, medical and environmental in...

Mice lacking social memory molecule take bullying in stride

...ch as depression, social phobia and post-traumatic stress disorder, in which social withdrawal is a prominent symptom. Drs. Olivier Berton and Eric Nestler, University of Texas Southwestern Medical Center (UTSMC), and colleagues, report on their study in the February 10, 2005 issue of Science. Coursing ...

'Genetic network' guards against lethal DNA damage

...DNA can undergo repair, and responses to oxidative stress necessary for reducing the intracellular levels of highly reactive molecules that bind to and damage DNA. The yeast has about 6,000 genes, of which about 1,000 are essential to survival and 5,000 are not, Boeke said. Specifically, 1,000 of the 5,000...

Sex: It's costly but worth it. Just ask a microbe

...sex exacts physical, morphological and behavioural stress on microbes. His findings are published in the recent edition of Genetics, published by the Genetics Society of America. "There was always an assumption that microbes reproduce asexually, but they are actually asexual and sexual," says Xu. Using a...

Retinol for combating leukemia cells

...rved that the retinamide accelerated the oxidative stress within the malign cells and that this stress triggered the mechanisms leading to apoptosis. This death is normally clean and programmed death, an...

For the first time: Longevity modulated without disrupting life-sustaining function

...ut food shortages aren't the only triggers for the stress program. Others are the heat that scrambles protei...cociously, the worms reap the benefit of increased stress resistance and double their lifespan from an average of 20 to 40 days. Except the worms trade a trim...

Gene variation increases SIDS risk in African Americans

...uggests a strategy for prophylactic therapy," they stress that their results "need to be replicated and the risks and benefits of treatment assessed" before screening programs are designed or drugs given to infants at risk to prevent SIDS. Repetition of the findings would "lead us to consider genetic scree...

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