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Tag: "relationship" at biology news

A bug's life: Exceptional genomic stability yet rapid protein evolution in a carpenter ant mutualist

...genome evolution in the context of a host-symbiont relationship emerges. As Wernegreen and her colleagues explain in their Genome Research article, long-term genome stasis is a striking characteristic of insect mutualists, and it may severely constrain the evolutionary potential of these symbiotic microbes. Howe...

Sudden change in social status triggers genetic response in male fish, study finds

...s to have some kind of understanding of what their relationship was in the past and what it is now. This implies a cognitive ability to process complex information, which is much more that we usually think of in fish." Reversible dominance The PloS Biology study is the latest in a series of experiments from...

Once-dreaded leprosy 'replaced' by tuberculosis, say researchers

...a in 42 percent of the cases. The findings on the relationship between leprosy and tuberculosis were reported in a recent edition of the British Royal Society Proceedings B by Dr. Mark Spigelman, a visiting professor at the Hebrew University Faculty of Medicine and of the University College London; Prof. Charles...

A new link between stem cells and tumors

..."This suggests new lines of investigation into the relationship between stem cells and tumors in other model organisms and humans." ...

Creeping crinoids! Sea lilies crawl to escape predators, new video shows

...He also hopes to learn more about the roots of the relationship between crinoids and their predators. "We think that perhaps the interaction between these slow-moving, bottom-dwelling predators and crinoids is a long one," he said, "and that it may have been connected in some way to pushing crinoids into develop...

Study uncovers placental microtransfusions lead to transmission of AIDS virus during childbirth

...d with HIV, he said. "We looked for a statistical relationship between the presence of the enzyme and the risk of infection in the babies," Meshnick said. "We found a very strong correlation between the enzyme and the risk of infection." It appears that transmission of the virus occurs during labor -- when cont...

U. of Colorado researcher identifies tracks of swimming dinosaur in Wyoming

...He also hopes to learn more about the roots of the relationship between crinoids and their predators. "We think that perhaps the interaction between these slow-moving, bottom-dwelling predators and crinoids is a long one," he said, "and that it may have been connected in some way to pushing crinoids into develop...

A little telomerase isn't enough

...stine among them. "We thought there might be some relationship 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 ...

Plant gene related to cancer treatment may foster new oncology drugs

...ts of the two studies suggest a previously unknown relationship between two protein families involved in this process, he said. Working together, the proteins apparently move molecules of the plant growth hormone auxin through cell walls. In humans, related proteins rid cells of toxins such as cancer drugs. "The...

Center releases new public survey on stem cells

...'s views about the moral status of embryos and the relationship of those views to ESC research policy preferences has not been fully explored. The survey showed that nearly the same number of Americans believe that an embryo in a Petri dish has no or low moral status (30 percent) or maximum moral status (28 perc...

Bigger brain size matters for intellectual ability

...on of nature and nurture are to this cerebral size relationship with intelligence, Witelson said. She added that the results point to the need for responsibility in considering the likely future use of magnetic imaging (or MRIs) of brain structure as a measure of ability in student and workforce settings. "We're...

Scientists pinpoint inflammation gene

...according to the study. The study found the same relationship between SEPS1 and inflammation in two geographically and ethnically distinct populations of people in the United States, one in Wisconsin and one in Texas. Greg Collier, Ph.D., CEO of ChemGenex, said the discovery of SEPS1 and its function could yi...

Did feathered dinosaurs exist?

...ination of fossilized remains of dinosaurs with no relationship to birds, they suggest that decomposition of skin can lead to patterns resembling feathers. Birds have been thought to be related to theropod dinosaurs because both groups have a hand reduced to three digits. Theropods are known from fossil evidenc...

Researchers show how air pollution can cause heart disease

.... The results added up to a clear cause and effect relationship between PM2.5 exposure and atherosclerosis, according to the study. On the whole, mice breathing polluted air had far more plaque than those breathing filtered air. In cross sections taken from the largest artery in the body--the aorta--mice on norm...

Marathon of nano-sprinters

...ity and leads to a highly nonlinear force-velocity relationship (PNAS, Advanced Online Publication, November 14-18, 2005). Molecular motors are nano-tractors for all kinds of cargo within the cells of living beings. They move in a stepwise manner along filaments of the cytoskeleton, consuming energy provided by ...

Scientists sequence DNA of woolly mammoth

...or study in part because of its close evolutionary relationship to the African elephant, whose nuclear DNA sequence has been made publicly available by the Broad Institute in Cambridge, Massachusetts (USA). Using comparisons with elephant DNA, the researchers identified 13 million base pairs as being nuclear DNA...

Finding the mind's eye

...ifying the neural basis of conscious experience, a relationship important to the fields of medicine, neurology and psychology. Tse and his co-authors, Susana Martinez-Conde, Alexander A. Schlegel and Stephen L. Macknik of the Barrow Neurological Institute, found that, "early areas in the visual processing hierar...

Why we give: New study finds evidence of generosity among our early human ancestors

.... "A core feature of reciprocity is the contingent relationship between acts of giving and receiving among social partners. Contingency is important because it sets the rules for who qualifies as a free-rider or cheater in exchange relations." A rigorous effort to quantify the extent and magnitude of different f...

New technique helps researchers determine amino-acid charge

...osed state." A major problem in understanding the relationship between structure and function in proteins, and the impact that electrostatics have on them, Grosman said, is not knowing the protonation state of ionizable residues. Protons, he added, are so small that they cannot be detected even with X-ray crysta...

Sleeping sickness parasite shows how cells divide their insides

...sing the innate RNA interference (RNAi) system.The relationship between the growing Golgi, the Centrin proteins and other cellular organelles was shown in experiments using RNAi, and visualizing the process was possible with fluorescent protein tags. How this process relates to higher organisms is the focus of pr...

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