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Tag: "aggressive" at biology news

New evidence of 'human' culture among primates

...urface several times. The act was apparently an aggressive one, directed at Dr Moura as a potential predator, but as the group became used to his presence in the area the stone-banging decreased. Furthermore, in a large minority of cases, adults and juvenile monkeys were seen banging the stones together with...

Short chromosomes put cancer cells in forced rest

...predisposed them to Burkitt’s lymphoma, a rare but aggressive cancer of white blood cells. Telomerase helps maintain the caps or ends of chromosomes called telomeres, which shrink each time a cell divides and eventually - when the chromosomes get too short - force the cell to essentially commit suicide. Such c...

Fish can determine their social rank by observation alone, study finds

... are extremely territorial and regularly engage in aggressive fights, the outcome of which determines who gets a... in social status," the authors wrote. "Success in aggressive bouts is therefore crucial to male reproductive fitness, and the ability to infer the relative stren...

Turning a cellular sentinel into a cancer killer

... genetic technique they had developed to induce an aggressive form of liver cancer in mice. Although they had in... said Lowe. "We were working with a very advanced, aggressive tumor, but when we reestablished p53, not only did it stop growing, it went away. "But the second ...

Dinosaur extinction didn't cause the rise of present-day mammals, claim researchers

...her died out completely, such as Andrewsarchus (an aggressive wolf-like cow), or declined in diversity, such as the group containing sloths and armadillos. The researchers believe that our 'ancestors', and those of all other mammals on earth now, began to radiate around the time of a sudden increase in the ...

Reversing cancer cells to normal cells

...t Mary J.C. Hendrix and colleagues discovered that aggressive melanoma cells (but not normal skin cells nor less aggressive melanoma cells) contain specific proteins similar to those found in embryonic stem cells. This grou...

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

... from what should have been lethal doses of highly aggressive new cancers. But while pursuing the ability of these white blood cells to cure cancer in ordinary mice, and beginning to explore whether the same process could work in humans, the researchers have also continued to investigate how the original mut...

St. Jude announces breakthrough in eye cancer treatment

...he paper. In those cases, the physicians institute aggressive systemic chemotherapy to reduce the size of the tumor, followed by one of several possible therapies such as radiation or lasers to destroy the remaining cancer cells in the eye. "When successful, this therapy often saves vision," Wilson said. "Clini...

New study aims to stop sepsis in its tracks

..."usual care" approach, which does not include such aggressive resuscitation. It will then follow all the patients for a full year after their recovery to detect any long-term differences in health and mortality rates. The scientists will also measure blood levels of certain factors that are thought to cause s...

OHSU researchers demonstrate how white blood cells cannibalize virus-infected cells

...lls, often called "helper" T-cells, which are less aggressive T-cells but also an important aspect of the immune system. "Another interesting finding for our lab is that in some ways, T-cells can be picky eaters," explained Slifka. "Although they will destroy almost any infected cell, they prefer to eat certa...

Invasive ants territorial when neighbors are not kin

... a much faster rate." In their native Argentina, aggressive interactions between colonies are much more common and colonies are significantly smaller. When Argentine ants were introduced to California 100 years ago, they spread widely because they did not encounter other colonies of Argentine ants. The biol...

Math model predicts cancer behavior

...vironmental conditions ?imagine a desert ?the most aggressive cell types dominate and the tumor shape has finger...environment in the tumor may leave behind the most aggressive and invasive tumor cells. "In the immediate term we may be diminishing tumor burden, but the long ...

'Super' enzyme may lead way to better tumor vaccines

..." he said. "It led to the elimination of some very aggressive tumors in the mice." In the laboratory, they found that the "super" Akt1 also has a potent effect on human dendritic cells as well, although it has not been used to treat people yet. He expects that when the enzyme is used in people, the first ...

Who gives stem cells their marching orders?

...een exposed to the Nodal signal. One hallmark of aggressive cancer cells is their unspecified nature, similar ...ern University seems to confirm this, showing that aggressive melanoma cells secrete the Nodal protein. Understanding the activity of this gene in embryonic devel...

A fisheye view of the deadliest breast cancer

...is for survival. To find out what drives this most aggressive of human breast cancers, and to rapidly screen fo...g system for anticancer drugs. In the race against aggressive breast cancers, Stoletov and colleagues see their xenografted, genetically engineered zebrafish as ...

Adolescent but not adult hamsters are more aggressive on low dose of fluoxetine

...ers taking common anti-depressants may become more aggressive or kill themselves. The research is published in ...s sold in the United States as Prozac, became more aggressive on low doses of the drug. Juveniles given high doses became somewhat less aggressive, but not as mu...

Newly discovered behavior in cancer cells signals dangerous metastasis

...c they would be," Garcia-Blanco said. "In reality, aggressive cancer cells are not homogenous, but are extremely versatile in their ability to adapt as their survival needs shift." The researchers discovered this transition in cancer cells when they observed an error in "alternative splicing," a key element of...

Stanford discovery may help predict when toxoplasma can be deadly

...ow to treat these and other infected people: More aggressive therapy may be warranted if a strain that contains the proteins that increase virulence is the cause of the infection. Humans can become infected by the parasite by accidentally consuming or inhaling the cysts from infected cat feces, by eating ...

Fighting like a girl or boy determined by gene in fruit flies

.... "Ed has systematically developed reproducibly aggressive behavior in flies and paved the way for serious analysis," said Laurie Tompkins, program director at the National Institute of General Medical Sciences, which funds the work. The fruit fly aggression model is part of a new trend to use fruit flies as...

World's smallest cancer detection device

...resence of metastatic cells that would demand more aggressive cancer therapy. "The NCI has placed a very high...astatic cells are present that would call for more aggressive cancer therapy. In 2005, Einstein formed an alliance with UAlbany's CNSE to advance education and ...

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