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Tag: "tendency" at biology news

Mussels evolve quickly to defend against invasive crabs

...ata does not exist on invasive ecology, "there's a tendency to extrapolate any data you get on an invasive species. But here we show that the response from the prey differs over just a couple hundred kilometers." And while its "real world" impact is not immediately obvious, Byers suggests that perhaps north...

Wild vs. lab rodent comparison supports hygiene hypothesis

...enic environment could simultaneously increase the tendency to have allergic reactions and the tendency to acquire autoimmune disease, despite the fact that these two reactions represent two different typ...

Adult stem cell research at UB targets damaged hearts

...d vessel regeneration and "homing potential" (the tendency to migrate properly to the heart rather than elsewhere) can better improve blood flow and tissue function in hibernating myocardium. ...

Hope I die before I get old?

...er at older ages than other people would be. This tendency to think of oneself as "above average" has been seen in other studies of everything from driving ability to intelligence, Lacey says. This bias may combine with negative attitudes about aging to help explain the study's findings, she notes. Further...

International team analyzes human genetic variation in key immune region

...sts in the MHC among different individuals and the tendency for multiple genetic differences in this region to be inherited together in groups called "haplotypes." To characterize the haplotype patterns of the MHC, the researchers analyzed the variability in its DNA sequence in more than 350 individuals fro...

History-hunting geneticists can still follow familiar trail

...imal species. They speculated that an evolutionary tendency for species to keep helpful genes and sift out detrimental ones, called "natural selection," preferentially affects mitochondrial diversity, making mtDNA less useful for population size estimates. "From a conservation perspective, when scientists ...

New moth variety disarms plants guarded by selenium

...igh levels, and the function behind the intriguing tendency of some plants to hyperaccumulate this element has been largely obscure. The so-called elemental-defense hypothesis proposes that hyperaccumulated elements serve a defensive function against herbivory, the predation of plants by animals. In their...

HIV exploits competition among T-cells

...ginal antigenic sin. Original antigenic sin is the tendency for memory immune cells produced in response to a ...chooses a winning set of T cells, it has a natural tendency to go with those cells when it's confronted by new strains of the same disease in the future," Deem ...

Exposure to dioxins influences male reproductive system, study of Vietnam veterans concludes

... but at extremely high exposure levels there was a tendency for the risk to increase." In addition, the study shows that higher dioxin exposure is associated with decreased testosterone levels, Dr. Gupta said. "It is known that lower testosterone levels are associated with decreased sexual function, dec...

Embryonic stem cells do better on bumpy nanoscale mattress

...properties. But until now, HES cell cultures had a tendency to spontaneously differentiate, that is, to veer off without warning into a developmental pathway. HES cell cultures have to be closely watched to remove any of these spontaneously differentiated colonies. Researchers have looked at surface che...

Nanoparticle assembly enters the fast lane

...chnique takes advantage of this molecule's natural tendency to pair up components called bases, known by the code letters A, T, G and C. "In biology, DNA is mainly an informational material, while in nanoscience, DNA is an excellent structural material due to its natural ability to self-assemble according...

Distinguishing friend from foe in the battle against cancer

...r cells with their backs against the wall have the tendency to fight back. A major goal of cancer research is to frustrate these acts of cellular desperation. In a forthcoming issue of Cancer Cell, investigators at the Salk Institute for Biological Studies uncover one means cancer cells use to stay alive and...

Archerfish tune their shots to universal properties of prey adhesion

...d lizards, an animal's adhesive force--its natural tendency to stick to a surface--is closely proportional to the animal's size. The researchers showed that for any given size of prey, the archerfish tune their attacks such that prey are hit with about ten times the force that adhesive organs of animals o...

Fishy cooperation

...at goes into complex behavior. Moreover, we have a tendency to underestimate the intelligence of animals at lower rungs of the evolutionary ladder. In fact, it is the ladder idea itself that is wrong. The best way to approach animal intelligence is from an evolutionary and ecological perspective focused on th...

Male contraception: One door opens, another closes

...up on the leads we have," says Lissner. "There's a tendency to support glamorous new research in the lab, but abandon it when it gets to the expensive part: actually testing it in men and getting it to market." This problem of moving leads from the lab to human studies affects all types of contraceptive re...

Single molecule extends fat mice lives by reversing gene pathways associated with disease in obese

...the livers of the HCR fed group and found a strong tendency for AMPK activation, as well as two downstream indicators of its activity. Calorie restriction and exercise have also been previously shown to increase the number of mitochondria in the liver. Mitochondria generate energy in cells. Through elect...

The great escape -- fleeing fish fall in line

...conditions, with no differential treatment, show a tendency for keeping a relatively fixed chronological order...ol.? Researchers are keen to explore whether the tendency to keep a fixed chronological order of escape corresponds to a leadership maintained over a relative...

Whitefly spreads emerging plant viruses

... proven difficult to control partly because of its tendency to develop insecticide resistance. "As the population levels of the whitefly B. tabaci continue to remain robust, new species of plant viruses will continue to emerge and cause damaging diseases in food and fiber crops," Brown said. Early vir...

Twin studies reveal genetic components leading to cardiac and kidney disease

...cardiac or kidney disease ?such as hypertension, a tendency toward obesity or diabetes, elevated blood glucose and lipids ?were just amorphous risk factors before," said O’Connor. "Now we know that they run in families, not only because of a shared environment, but because they are determined in part by part...

New species declared: Clouded leopard on Borneo and Sumatra

...ud markings, and they are lighter in color, with a tendency toward tawny-colored fur and a partial double dorsal stripe. “Who said a leopard can never change its spots? For over a hundred years we have been looking at this animal and never realized it was unique,?said Adam Tomasek, head of WWF’s Borneo a...

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