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Tag: "conclusive" at biology news

More animals join the learning circle

.... But the evidence from killer whales is much more conclusive because the process was observed from start to finish. Some researchers have suggested that many purported examples of cultural transmission can instead be explained by individuals discovering the skill on their own rather than following another's l...

Tiny roundworm's telomeres help scientists to tease apart different types of aging

...a few years. Nobody yet knows why. But now we have conclusive evidence that telomeres alone do not dictate aging and lifespan," says Karlseder. Each time a cell divides, its telomeres get shorter, a process called replicative or cellular aging. Some have likened this progressive erosion of telomeres to a genet...

Female butterflies go for sparkle -- not size -- when choosing to mate

...re approximately half of one millimeter. The most conclusive finding resulted when the researchers painted the white pupils in male eyespots on the dorsal side with a plant extract, rutin, which maintained the pupils' whiteness, but eliminated their ultraviolet reflectivity. "When there was no UV reflectivity...

Bone marrow stem cells may heal hearts even years after heart attacks

...and involved only 18 patients, it does not provide conclusive proof that the technique is effective. However, he noted that the results of large randomized, double-blinded clinical trials are expected soon. ...

Study ties 'new' cell-death mechanism to developmental and degenerative brain disorders

...international research team has provided the first conclusive evidence that neurodevelopmental disorders such as mental retardation and neurodegenerative disorders such as Alzheimer's disease, Parkinson's disease and ataxias can be caused, at least in part, by specific gene defects that interfere with the elect...

New analysis shows three human migrations out of Africa

...he minus 17th. In science, you don't get any more conclusive than that. It says that the hypothesis of no interbreeding is so grossly incompatible with the data, that you can reject it." Templeton's analysis is considered to be the only definitive statistical test to refute the theory, dominant in human evol...

Spinal cord bridge bypasses injury to restore mobility

... combination of treatments. This provides the most conclusive evidence to date that severed nerve fibers in the spinal cord can, in fact, regenerate for long distances and establish proper functional connections. Silver said if the method is perfected and successful with primates, it could go to human trials...

Acid rain causing decline in sugar maples, say researchers

...ounded dramatically. The study provides "the most conclusive evidence to date" that the decline of sugar maples is linked to the effects of acid rain produced by human activity, said Timothy Fahey, professor of forest ecology at Cornell and co-author of the study, which is published in the May issue of Ecology...

Gene therapy prevents the onset of diabetic symptoms in mice

...ounded dramatically. The study provides "the most conclusive evidence to date" that the decline of sugar maples is linked to the effects of acid rain produced by human activity, said Timothy Fahey, professor of forest ecology at Cornell and co-author of the study, which is published in the May issue of Ecology...

Volcanic eruptions, ancient global warming linked

...ges in the ocean chemistry, Duncan pointed out. No conclusive links have been established, however, he added. "Similarly large submarine volcanic events correlate with major marine anoxic events ?periods of no oxygen in the deep-ocean water ?which we think are triggered by high surface productivity of plankt...

Baumann Lab defines proteins that distinguish chromosome ends from DNA double-strand breaks

...ified and proposed to protect chromosome ends, but conclusive evidence that any of these are required for protection has been lacking. "We set out to define the minimal requirements that would allow the DNA repair machinery to distinguish a chromosome end from a break," said Dr. Baumann. "By establishing an...

Scientists discover rare 'gene-for-gene' interaction that helps bacteria kill their host

...sects unable to produce phenoloxidase. "This is conclusive evidence for a gene-for-gene interaction between the bacterium and the insect," said Richard ffrench-Constant (correct) of Exeter University. "Photorhabdus is an important biocontrol organism that is used to control insect pests and reduces pestic...

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