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Densely packed granular particles that inch past each other under tension interact in ways more complex and surprising than previously believed, two Duke University physicists have discovered.
Their observations, described in the Thursday, February 27, 2003, issue of the research journal Nature, could provide new insight into such geophysical processes as the behavior of a slowly moving glacier or an active earthquake fault, said Robert Behringer, a Duke physics professor who is one of the
They may cause excruciating pain, auditory or visual disturbances, dizziness and many other problems that compromise or eventually threaten life. They often grow for years, causing ever-worsening symptoms but evading detection and diagnosis. In fact, many tumors situated beneath the brain are considered benign because they don’t spread to other organs or increase rapidly in size, but they gradually interrupt blood flow, hormone production, and normal sensations as they grow and press against organs,
Darwin in his time wondered about the existence of ants – how can natural selection as a process based on individual reproductive success give rise to sterile individuals such as ant workers? The solution comes from kin selection theory, which holds that an individual’s reproductive success can also be measured in the number of collateral kin produced. This is how the ants have solved the problem. In an ant colony with only one queen all the workers are her offspring and will in practice help to
Of the five basic senses, the sense of smell is the least understood. Now, scientists at the University of Illinois at Urbana-Champaign have sniffed out potential clues to how olfactory receptors in the nose detect odors. Those clues may also explain why dietary zinc deficiencies lead to a loss of smell.
Olfactory receptors are proteins that bridge through the cell membrane. Professor Kenneth S. Suslick and co-workers have found that the structure of the protein changes dramatically when a
It is natural to suppose that conducting the same tests, with the same strain of mice and the same protocols on identical equipment but in different labs will ensure similar results. A University of Alberta researcher and his team have found that assumption not to be true–fuelling the nature vs. nurture debate and shedding some light on the importance of environmental factors in experiments.
Dr. Douglas Wahlsten, from the Department of Psychology, is part of a research team that use mice w
The same in-road detectors that control traffic lights and monitor traffic could soon respond quicker to traffic jams, thanks to software developed by an Ohio State University engineer.
In tests, the software helped California road crews discover traffic jams three times faster than before, allowing them to clear accidents and restore traffic flow before many other drivers would be delayed.
This technology could also provide drivers with the information they need to plan efficient