Credit: Daniel Janzen
A common butterfly, found in a variety of habitats from the southern United States to northern Argentina, is actually comprised of at least 10 separate species, according to researchers from the University of Pennsylvania.
Astraptes fulgerator, a medium-large skipper butterfly, is a routine visitor to urban gardens and tropical rainforests. While the "species" has been known to science since 1775, only now has examination of a small and standardized signature piece of the genome – a technique called DNA barcoding – shown that this "species" is really an amalgam of a number of genetically distinct lineages, each with different caterpillars and preferences in food plant and ecosystem.
However, as many as six species can live in the same place, which strongly suggests mating segregation. Because the adults differ at best only slightly in appearance -- so slightly that it was attributed to ordinary "variation" -- this finding may have larger implications for maintaining biodiversity.
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Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
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