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Tag: "evidence" at biology news

Scientists use manufacturing methods to reconstruct mastodon

...ed and became extinct some 10,000 years ago. Using evidence from tusks, bones, excavation sites and comparison...ern Michigan in the late 1980s, he found the first evidence that Ice Age hunters in North America butchered mastodons and preserved the meat by storing it under...

Second messenger NAADP shows fast, dose-related impact on satiety cycle

...one of high and one of low affinity. "Unequivocal evidence that NAADP is a crucial messenger" "Intriguingly,... data in this experiment provides the first direct evidence that cholecystokinin elicits a rapid, dose-dependent and selective increase in NAADP, and thus unequ...

Unlike other mammals, newborn dolphins and orcas stay active 24/7 during first months of development

.... "Their bodies have found a way to cope, offering evidence that sleep isn't necessary for development and raising the question of whether humans and other mammals have untapped physiological potential for coping without sleep." Researchers observed two adult female killer whales and their calves at Shamu St...

Tsunami-damaged coral reefs should be left to recover naturally, say scientists

... much larger scale, the scientists say there is no evidence to suggest that the vast majority of reefs will no...There are many quick fixes on offer but scientific evidence suggests that in most cases these would not be a good use of scarce resources and could actually har...

Evidence of 600-million-year old fungi-algae symbiosis discovered in marine fossils

...rchers from China and the United States have found evidence of lichen-like symbiosis in 600-million-year-old fossils from South China. The previous earliest evidence of lichen was 400 million years old, discovered in Scotland. The discovery also adds to the scarce f...

Climatologists discover deep-sea secret

...g weather records from the past. This is the first evidence showing that waters in the southern hemisphere play an active role in sudden climate changes. Today's climate in Europe and North America is greatly influenced by the gulf stream. This ocean current carries warm water from the Gulf of Mexico northwa...

Research may provide new link between soft drinks and weight gain

A University of Cincinnati (UC) study provides new evidence that drinking large amounts of beverages containing fructose adds body fat, and might explain why sweetening with fructose could be even worse than using other sweeteners. Researchers allowed mice to freely consume either water, fructose sweetened w...

High fidelity keeps human DNA assembly line humming

...alling movement of the DNA conveyer belt. Finding evidence of quality control gives some perspective to the elegance of cell creation. Burton said it does not mean mistakes never occur. The assembly line analogy holds up there. The human system has an acceptable level of error required to allow for the speed...

Major new UNC-based drinking water study suggests pregnancy fears may be overstated

...s (miscarriage). The study uncovered no clear-cut evidence that trihalomethanes harmed women or their develop...erall -- on balance -- I'd say this work moves the evidence in a reassuring direction and should serve to lessen concerns." Because of the overall negative res...

Discovery of New Dopamine Action May Yield Alternative Psychiatric Drugs

...se results provide direct physiologically relevant evidence for the emerging concept that beta-arrestin 2 not only controls desensitization but also participates in slow synaptic transmission here by acting as a scaffold for signaling molecules in response to dopamine receptor activation," Caron said. "The o...

Ancient DNA helps clarify the origins of two extinct New World horse species

...is of the South and North American horses provided evidence that stilt-legged horses, the Hippidion genus, and...nd temporally, Cooper explains, "we see no genetic evidence that these are different species." If true, the study's new model could provide a tool for explorin...

Does vitamin C help prevent or treat the common cold? Maybe not, after all.

...uine biological effect." But the authors did find evidence that the vitamin could help prevent colds in peopl...ticle summarizes their more detailed review of the evidence that is published by the Cochrane Library (see www.cochrane.org) and that is freely available via th...

Brain Scan Study of Smokers Reveals Signature of Craving

... agent responsible for cigarette addiction, recent evidence suggests that conditioned responses to sensory cues also play an important role, McClernon said. Brain imaging studies of smokers have found increases in brain activity in response to smoking-related images in areas associated with attention, motivat...

Map of life on Earth could be used on Mars

...een organisms present on Earth today ?which fossil evidence and a method called isotopic fractionation have failed to show conclusively. Blank most recently presented her research at the 2004 annual meeting of the Geological Society of America. Microorganisms can be divided into haves and have-nots: cells of...

UN: World in big ecological mess

... see. The future now lies in our hands." Although evidence remains incomplete, the report finds enough to warn that ongoing degradation of 15 of the 24 ecosystem services examined ?including fresh water, capture fisheries, air and water regulation, and regulation of regional climate, natural hazards and pest...

High-powered gene profiles provide clues to genes involved in common form of lung cancer

...fied by the Dana-Farber team. "This is compelling evidence that we're on the right track," says the study's other first author, Kwok-Kin Wong, MD, PhD, of Dana-Farber. "It's likely that the genetic mutations already linked to NSCLC constitute only a portion of all the genetic errors that drive the disease. O...

Genome study of beneficial microbe may help boost plant health

...infect bacteria. Says Paulsen: "We found exciting evidence that P. fluorescens may have acquired new clusters of genes, called genomic islands, by means of lateral transfer from phages or other microbes." ...

Stem cell treatment improves mobility after spinal cord injury

...spinal cord injuries, providing the first physical evidence that the therapeutic use of these cells can help restore motor skills lost from acute spinal cord tissue damage. Hans Keirstead and his colleagues in the Reeve-Irvine Research Center at UC Irvine have found that a human embryonic stem cell-derived t...

Studies reveal how plague disables immune system, and how to exploit the process to make a vaccine

...Our data, the authors conclude, "provide the first evidence of plague vaccines that do not suppress innate immune responses ?and that may be useful for plague vaccination in animals, and, perhaps, humans." The next steps include testing in other animal models, said Schneewind. The two papers combined, Schnee...

Random gene expression may drive HIV into hiding

... of HIV's replication cycle, the researchers found evidence that the virus may become latent in some cells by harnessing the random molecular behavior of the cell. HIV can hide in cells for years before reappearing to make new virus. Latency is considered one of the biggest reasons why drug therapy fails to ...

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