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A new generation of realistic models of the human body could give radiation scientists and medical workers a better view of how exposure to radiation affects different internal organs. These so-called “voxel phantoms” offer a new way to reveal the effects of radioactive particles that have been ingested or breathed in or otherwise entered the body. (The word “voxel” means volume element and is the three-dimensional equivalent of pixel).
Maria Zankl of the Institute of Radiation Protection in
But scientists say human effects can be a positive, not negative, factor for life on earth
Human beings now directly influence more than three quarters of the earth’s landmass, according to a state-of-the-art map of the world produced by a team of scientists from the New York-based Wildlife Conservation Society (WCS) and Columbia University’s Center for International Earth Science Information Network (CIESIN). Published in the latest issue of the scientific journal BioScienc
Researchers at the National Institutes of Health have developed several drug candidates that show promise in animal studies in protecting the brain against sudden damage from stroke, with the potential for fighting chronic neurodegenerative conditions like Parkinson’s and Alzheimer’s disease. The drugs, called p53 inhibitors, attack a key protein involved in nerve cell death and represent a new strategy for preserving brain function following sudden injury or chronic disease, according to t
Researchers have developed a new way to use a decade-old imaging method to directly compare the brains of monkeys with those of humans. Their report appeared in the journal Science.
The method uses functional Magnetic Resonance Imaging (fMRI) – a technique that measures blood volume and flow and blood-oxygen levels in the brain. It also provides an indirect measure of neuronal activity in different regions of the brain.
Neurons need oxygen and glucose to work. Blood carries
A new giant was born recently in the coastal waters of Antarctica. A series of images captured from May through the beginning of this month by ESA`s Envisat satellite shows the subsequent duel between the new iceberg and another as it breaks free of the Ross Ice Shelf and tries to move north.
Christened C-19 by the US National Ice Centre in Maryland, the new iceberg measured 200 x 32 km, and about 200 m thick.
As seen in the accompanying animation of images acquired by Envi
The incidence of gastrointestinal stromal tumours (GISTs), generally considered a rare sarcoma, is more than three times as high as previously believed, according to data presented in Nice at the 27th annual European Society of Medical Oncology (ESMO) Congress. An accurate estimate of GIST incidence has been elusive because of diagnostic ambiguities, now largely resolved by modern immunohistochemistry.
The higher incidence of GIST – calculated at 16 per 1,000,000 people annually – is especi