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Tag: "varies" at biology news

Bigger horns equal better genes

...ting for reproductive mates (7 to 12), horn length varies according to genetic diversity: the greater the diversity, the greater the length of the horns. The researchers believe the horn length discrepancies are evidence to support the mutation accumulation theory of ageing, which is the idea that, bec...

Research finds that circadian rhythms dominate all life functions

...n of satiety after eating. The oscillating pattern varies in different organs and determines the effect of leptin on regulation of the energy balance. Better understanding gene oscillation may provide researchers with clues for developing ways to treat people who overeat because of impaired leptin signaling...

WHO data confirms low level of resistance to Tamiflu

...countries worldwide. The magnitude of these orders varies with some countries, France, Finland, Iceland, Ireland, Luxembourg, Netherlands, New Zealand, Norway, Switzerland and UK stockpiling or intending to stockpile adequate quantities of Tamiflu to cover 20-40% of their population. Roche has also donated ...

Slowing the racing heart

...ster or slower to induce a rhythmic heartbeat that varies to increase or decrease the blood flow to the body as we eat, sleep or exercise. "Disturbances of pacemaker control are common in heart diseases. When the heartbeat becomes non-rhythmic and chaotic, it can result in fatal arrhythmias and stroke,"...

In young mice, gregariousness seems to reside in the genes

...r much less so. "Their motivation to engage others varies with their genetic background; it appears to affect how young mice approach social situations." The inbred strains of mice used in the study, once weaned, display markedly different social aptitudes. Young mice from one strain are amicable, spendi...

Gene found for rare disorder may reveal new pathway in mental retardation

...s an estimated one in 10,000 children. The disease varies from milder to more severe forms, but classically includes mental retardation, impaired growth, heart defects, feeding problems, deformed upper limbs and distinctive facial features. In the current study, mutations in two genes of interest cause m...

How trees manage water in arid environments

...third of the region's yearly rainfall. The monsoon varies from year to year in starting date, duration and intensity. "The semi-arid forest ecosystem adapts to the extremes in the annual cycle of water availability by its ability to remain turned on during the winter," Brown said. "Water stress, rather t...

Ethanol vehicles pose a significant risk to human health, study finds

...end on exposure to these airborne chemicals, which varies from region to region. Ours is the first ethanol study that takes into account population distribution and the complex environmental interactions.'' In the experiment, Jacobson ran a series of computer tests simulating atmospheric conditions throu...

FDA causes unnecessary scare about common painkillers

...cognize the evidence that the risk of heart attack varies substantially among this group of drugs and that Voltaren has the highest risk of all. Since it is the most commonly used NSAID, the unrecognized harm it has caused worldwide could be enormous." The European Regulatory Agency has reviewed the same...

White blood cells of cancer-resistant mice overwhelm natural defenses of cancer cells

...elivered to the cancer cells. The killing molecule varies with the white-cell type. The ordinary mice lack the first two steps. The researchers found that the anti-tumor response involved white blood cells of the so-called innate immune system, which the body ordinarily employs to fight off bacteria, bu...

Global map shows new patterns of extinction risk

...es, we have been able to see how this real picture varies from assumptions that have previously been made about global biodiversity of endangered species." Professor Owens adds that this geographical discrepancy in hotspots of endangered species from different groups can be explained by the different fac...

Hundreds of thousands of viral species present in the world's oceans

...pecies, supporting the idea that the marine virome varies from region to region. They also investigated how similar the viromes from each location were--in fact, the differences were mostly explained by variations in relative abundance of the viral species, and supports the notion that although everything i...

Older fathers more likely to have autistic children

...is influenced by the sociocultural environment and varies across societies and over time," they continue. "In a given population, a change in the sociocultural environment could produce a change in paternal age at birth. In theory, it could thereby lead to a change in the incidence of genetic causes of au...

Rearing an army to save wheat

...ly occurring suppression of wheat stem sawfly that varies greatly from field to field throughout Montana. The wasps produce two generations of offspring a year, compared to only one for the wheat stem sawfly. A number of Montana counties now have established populations of these natural enemies in their ...

Some butterflies travel farther, reproduce faster

...tch to start a new population. Flight capability varies quite a lot among females, who carry the eggs and establish new populations. For those reasons, natural selection on flight and reproductive capability acts primarily on the females. Travelers reproduce more quickly This study examined whether ...

Mayo Clinic: Gene expression profiling not quite perfected in predicting lung cancer prognosis

...curacy of gene expression-based outcome prediction varies greatly among studies. Most studies lacked independent validation. Clinical outcome prediction between gene expression profiles and pathological features overlap significantly. Current analytical algorithms favor genes at high expression or gen...

Researchers barcode DNA of Venice museum's vast fungi collection

...e unique in each species. The length of the region varies from around 450 base pairs to 900 base pairs, depending upon the taxa from which it is sampled. "If you're going to cross-compare species, you've got to amplify the same region," said Sarah Bergemann, the post-doctoral researcher in ecosystem scie...

Pleasure and pain: Study shows brain's 'pleasure chemical' is involved in response to pain too

...e someone experiences pain ?and that this response varies between individuals in a way that relates directly to how the pain makes them feel. It's the first time that dopamine has been linked to pain response in humans. The finding, published in the October 18 issue of the Journal of Neuroscience, may h...

Researchers examine why food tastes bad to chemotherapy recipients

... odor is very complex, and like nutritional needs, varies depending on age, gender, race, health status, prior exposure and experience. Two graduate CEE students, Pinar Omur-Ozbek and Jose Cerrato, both of Blacksburg, Va., will work on this project. ...

Researchers map spread of pathogens in the human body

...p ahead of the immune response. The type of spread varies between different bacteria, thus posing challenges for the rational treatment or prevention of these infections. Some antibiotics and vaccines are better at killing bacteria outside of the cells; others are more effective at killing infections wit...

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