A new commentary just published in the Proceedings of the National Academy of Sciences claims that more evidence is mounting that birds did not evolve from ground-dwelling theropod dinosaurs and challenging decades of accepted theories about the evolution of flight.
The weight of the evidence is now suggesting that not only did birds not descend from dinosaurs, but that some species now believed to be dinosaurs may have descended from birds, according John Ruben, a professor of zoology at Oregon State University who authored the PNAS commentary.
A new study conducted by researchers from UC Davis and the John Innes Center in Norwich, England, suggests that it is harder than previously thought to predict when sudden shifts in Earth's natural systems will occur. The finding is troubling for scientists who are trying to identify the tipping points that could push climate change into an irreparable global disaster. The study was published recently in Ecology Letters.
Despite the over-promotion of nicotine replacement therapies by drug companies and anti-tobacco activists, the most successful method used by ex-smokers is unassisted cessation, according to a new policy forum in PLoS Medicine. In the article, researchers from the School of Public Health at the University of Sydney, Australia take a critical look at most tobacco control campaigns, which emphasize that serious attempts at quitting smoking must be pharmacologically or professionally mediated.
A collaborative study involving scientists from 12 UK research institutions, universities and conservation organizations suggests that the trend towards earlier UK springs and summers has been accelerating. The study, published recently in Global Change Biology, is the most comprehensive and rigorous assessment so far of long-term changes in the seasonal timing (phenology) of biological events across marine, freshwater and terrestrial environments in the UK, the authors say.
Vesicular stomatitis virus, or VSV, has shown the potential to serve as an anti-cancer agent, exercising high selectivity in killing cancer cells while sparing healthy cells, and as a potent vaccine against HIV. But in order for the necessary genetic modifications to occur, scientists must have an accurate picture of the virus's structure.
While three-dimensional structural information of VSV's characteristic bullet shape and its assembly process has been sought for decades, efforts have been hampered by technological and methodological limitations.
According to a study of 1025 13-17 year-olds, gaming, texting, or staring at the TV for hours on end are unlikely to cause headaches in adolescents, but listening to one or two hours of music every day may do the trick. The study appears this week in BMC Neurology.
The researchers interviewed 489 teenagers who claimed to suffer from headaches and 536 who said they did not. When the two groups were compared, no associations were found for television viewing, electronic gaming, mobile phone usage or computer usage.