survival 2 6

Tag: "survival" at biology news

The ecological effects of the Chernobyl disaster

...nt "Consequences of radiation for reproduction and survival of barn swallows Hirundo rustica from Chernobyl." Barn swallows are long-distance migratory birds, which nest across Europe, providing researchers with numerous populations to sample. Examining swallows from the Chernobyl region and Kanev, southeast ...

Drug resistant avian influenza viruses more common in Southeast Asia than North America

... either a beneficial genetic trait that gives it a survival advantage in a particular environment and therefor...China indicates that these variants appear to have survival advantages over the wild, drug-sensitive strains. In addition, the infected birds die so rapidly the...

Prions rapidly 'remodel' good protein into bad, Brown study shows

...remained healthy but had new characteristics. This survival supports the theory that prions have endured through evolution because shape-shifting is advantageous, allowing cells to avoid stress by rapidly adjusting to a new environment. "Our studies provide some insight into how the appearance of a misfolded...

An essential regulator of body weight revealed

...ates that mutations in human genes that affect the survival of these neurons or their ability to respond to hormonal signals could alter eating behavior and body weight regulation. Now that his lab has demonstrated that NPY/AgRP neurons are critical for feeding in adults, Palmiter said the next step will be ...

Biologist Discovers What May Be World’s ‘Pickiest?Mates

...earch. Why are female fiddler crabs so picky? The survival of their offspring, deRivera found in her experiments, appears to be strongly linked to the size of their mate and, more importantly, his corresponding abode. “The size of the male’s burrow affects the development time of his larvae,?she said. “A bu...

Researcher says flu responders can learn from 1918 epidemic

...the fate of their forebears, but Higgins said that survival might depend on the simple concept of community planning. In studying the metropolitan areas around the state of Pennsylvania, Higgins found that the areas that suffered the lowest mortality rates included Bethlehem, which benefited from the resou...

Minimally Invasive Cancer Treatments Highlighted

...r) in a study of 162 patients, in terms of overall survival and rate of tumor recurrences. (Author, Lencioni) ?A study assessing survival in patients with small solitary colorectal liver metastasis treated with RFA shows that their surviv...

Many smokers fail to quit after cancer diagnosis

... side effects of treatment may be exacerbated, and survival rates are lower. Quality of life (QOL) is also better in nonsmokers. For example, multiple studies found that compared to nonsmokers, current smokers had significantly worse physical and psychological daily functioning. Clinical guidelines for gener...

Chernobyl: The true scale of the accident

... nine children died of thyroid cancer; however the survival rate among such cancer victims, judging from experience in Belarus, has been almost 99%. * Most emergency workers and people living in contaminated areas received relatively low whole body radiation doses, comparable to natural background levels...

Cornell finds natural selection in humans

...e favored because they increase the probability of survival or reproduction -- is responsible for the increased rate of evolution. Since genes are blueprints for proteins, positive selection causes changes in the amino acid sequence of the protein for which the gene codes. "Our study suggests that natural s...

Plant wounds trigger bacteria

...hromosome and is not essential for the bacterium's survival but is required for tumor growth. The plasmid can also transmit itself from one bacterial cell to another when the two cells touch one another, in bacterial congress. The plasmid recognizes organic compounds called phenols that leak out of damaged c...

Regenerating worms help elucidate stem cell biology

... the body's normal activities is essential for the survival of most organisms. The new study, published in the November 25, 2005, issue of the journal Science, helps scientists understand how stem cells make this process possible. The research, performed at the University of Utah School of Medicine, was ca...

CO2 sensing proves critical for fungal pathogens to adapt to life in air and human hosts

...rast, the CA enzyme is dispensible for the yeast's survival in the high- CO2 environment of the host. Another major finding of the work is that for C. neoformans, high CO2 blocks sexual differentiation, which is known to be a key process for generating infectious spores, and the CA enzyme plays a central role...

HIV mortality in India drops with introduction of generic antiretroviral therapy

The survival rate of HIV-infected patients in India has risen in response to a 20-fold drop in the price of antiretroviral therapy (ART), according to an article in the Nov. 15 issue of Clinical Infectious Diseases, now available online. The introduction of gener...

Life in deadly conditions

...arth. The scientists studied mechanisms that make survival possible for the single-celled organisms, which are rod-shaped and are only five hundredths of a millimetre in size. At the Department of Membrane Biochemistry, led by Professor Dieter Oesterhelt, Max Planck researchers have shown, using genomic and ...

A little telomerase isn't enough

...onship between telomerase, telomere length and the survival of stem cells, but it was really exciting to see it," says Greider. When the researchers looked at fifth-generation mice that had by chance inherited their parents' good telomerase copies, giving the animals a full complement of telomerase, they wer...

Removing egg from nest may help save endangered whooping crane

...ping crane's nest increases the species chances of survival despite governmental concerns about tampering with nature, says a University of Alberta scientist. Dr. Mark Boyce, from the Faculty of Science, studied the policy of removing from Wood Buffalo National Park one of two whooping crane eggs laid and r...

Why Christmas trees are not extinct

...h less common than they are, and conceivably their survival might be marginal." The journal Science is publishing the study Dec. 23, two days before Christmas. Sperry says that if conifers had not evolved easy-flow valves to make up for the short length of their water pipes or conduits, "it is doubtful they...

Double trouble: Cells with duplicate genomes can trigger tumors

...odel organism-- yeast-- that are essential for the survival of tetraploid cells but not for cells with a normal number of chromosomes" Pellman says. "You knock out those genes, and the tetraploid cells die. We are eager to find out if this can be extended to cancer cells and the new animal model should help u...

New technique multiplies life span in simple organisms

...1, may block the organism from entering an extreme survival mode characterized by the absence of reproduction,...med both to reproduce normally and to maximize its survival systems. Longo urged caution in extrapolating the result to humans. "We have been very successful ...

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