In this composite photograph, a rock pigeon preening its feathers is superimposed on a closeup image of a rock pigeon feather with lice trying to hide between feather branches to escape preening.
Credit: Dale H. Clayton and Sarah E. Bush, University of Utah
Study Shows Why Each Parasite Species Often Infests a Favorite Host Species
University of Utah biologists twirled louse-infested bird feathers on an electric fan and flew pigeons and doves like kites on strings in a study that found small lice stick to small birds and big lice prefer big birds.
The study also showed why size matters to parasites: Lice infest bird species with feathers that are just the right size so the insects can hide between individual “barbs” – the hair-like branches that extend from the shaft of each feather. When lice can hide in the feathers, the birds cannot preen them off with their beaks.
Lee Siegel | University of Utah
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Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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