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Archive del 14 marzo 2010


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Ritmi circadiani

Tutte le attività biologiche dei viventi sono caratterizzate da un andamento ciclico la cui durata è di circa 24 ore.

Immagine anteprima YouTube


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Universo Segreto
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  • WHO issues roadmap to scale up international response to the Ebola outbreak in west Africa
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    Almost a hundred years ago in 1929 Linus Pauling presented the famous Pauling’s Rules to describe the principles governing the structure of complex ionic crystals. These rules essentially describe how the arrangement of atoms in a crystal is critically dependent on the size of the atoms, their charge and type of bonding. According to scientists today, simila […]
  • Danish museum discovers unique gift from Charles Darwin
    The Natural History Museum of Denmark recently discovered a unique gift from one of the greatest-ever scientists. In 1854, Charles Darwin – father of the theory of evolution – sent a gift to his Danish colleague Japetus Steenstrup, director of the Royal Museum of Natural History. Until very recently, no one at the museum knew that it possessed a piece of sci […]
  • Snails tell of the rise and fall of the Tibetan Plateau
    The rise of the Tibetan plateau -- the largest topographic anomaly above sea level on Earth -- is important for both its profound effect on climate and its reflection of continental dynamics. Scientists have now employed a cutting-edge geochemical tool -- "clumped" isotope thermometry -- using modern and fossil snail shells to investigate the uplif […]
  • Flapping baby birds give clues to origin of flight
    The origin of flight is a contentious issue: some argue that tree-climbing dinosaurs learned to fly in order to avoid hard falls. Others favor the story that theropod dinosaurs ran along the ground and pumped their forelimbs to gain lift, eventually talking off. New evidence showing the early development of aerial righting in birds favors the tree-dweller hy […]
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