By combining epidemiology and informatics, it is possible to assess scenarios and predict epidemic evolutions, thus allowing policy makers and health institutions to better manage health emergencies. This is the core concept of GLEAM, an online informatics tool that simulates the unfolding of epidemics across the world.
GLEAM combines data from different sources – distribution of the world-wide population, their daily interactions and journeys, international air traffic – with models of infection dynamics, in order to simulate and possibly predict the spreading pattern of infectious diseases epidemics. This approach has been validated against historical epidemic outbreaks including the SARS epidemic in 2002 and proved to be effective when used to produce real time forecast of the spatial and temporal evolution of the H1N1 pandemic in 2009.
The software system is publicly available and is the result of the combined efforts of a cooperation between some institutions in Italy, France and USA. At the moment, the project is hosted by the Northeastern University in Boston and the Institute for Scientific Interchange (ISI) in Turin, and is partially founded by the National Institute of Health and the Defense Threat Reduction Agency.
Forecasting epidemic: GLEAM
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Discovered a New Carbon-Carbon Chemical Bond
A group of researchers from Hokkaido University has provided the first experimental evidence of the existence of a new type of chemical bond: the single-electron covalent bond, theorized by Linus Pauling in 1931 but never verified until now. Using derivatives of hexaarylethane (HPE), the scientists were able to stabilize this unusual bond between two carbon atoms and study it with spectroscopic techniques and X-ray diffraction. This discovery opens new perspectives in understanding bond chemistry and could lead to the development of new materials with innovative applications.
In the cover image: study of the sigma bond with X-ray diffraction. Credits: Yusuke Ishigaki
After nearly a year of review, on September 25, a study was published in Nature that has sparked a lot of discussion, especially among chemists. A group of researchers from Hokkaido University synthesized a molecule that experimentally demonstrated the existence of a new type of chemical bond, something that does not happen very often.