Kzqb Variability in brain function is linked to better memory and fluid intelligence in older adults
A protein known for turning on genes to help cells survive low-oxygen
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conditions also slows down the copying of new DNA strands, thus shutting down the growth of new cells, Johns Hopkins researchers report. Their discovery has wide-ranging implications, they say, given the importance of this copying 鈥?known as DNA replication 鈥?and new cell growth to many of the body鈥檚 functions and in such diseases as cancer.鈥淲e鈥檝e long known that this protein, HIF-1alpha, can switch hundreds of genes on or off in response to low oxygen conditions,鈥?says Gregg Semenza, M.D.,
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Ph.D., a molecular biologist who led the research team and has long studied the role of low-oxygen conditions i
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n cancer, lung disease and heart disorders. 鈥淲e鈥檝e now learned that HIF-1alpha is even more versatile than we thought, as it can work directly to stop new cells from forming.鈥?A report on the discovery appears in the Feb. 12 issue of Science Signaling.With his team, Semenza, who is the C. Michael Armstrong Professor of Me LONDON:A new study suggests that updating your status or commenting on a friend's holiday pictures can make us lose track of time as we do it. People who are using Facebook or surfing the web suffer impaired perception of time, said the study published in the Journal of Applied Social Psychology."We found evidence that Internet and Facebook related stimuli can distort time perception due to attention and arousal related mechanisms," said the study by researchers from University of Kent in England.Most Facebook posts inspired by envyThe researchers found that the way people perceived time var
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ied according to whether their internet use was specifically Facebook related or more general.Using well-established internal clock models, the researchers attempted to separate the roles of 'attention' and 'arousal' as drivers for
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time distortion.In the study, Lazaros Gonidis and Dinkar Sharma monitored the responses of 44 people who were shown images for varying d
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egrees of time.While some of the i