The Nobel Prize in Literature for 2011 is awarded to the Swedish poet Tomas Tranströmer because, through his condensed, translucent images, he gives us fresh access to reality.
[ add comment ] ( 1017 views ) | permalink | ( 3 / 3139 )
Shechtman's image, however, showed that the atoms in his crystal were packed in a pattern that could not be repeated. Such a pattern was considered just as impossible as creating a football using only six-cornered polygons, when a sphere needs both five- and six-cornered polygons. His discovery was extremely controversial. In the course of defending his findings, he was asked to leave his research group. However, his battle eventually forced scientists to reconsider their conception of the very nature of matter.
Aperiodic mosaics, such as those found in the medieval Islamic mosaics of the Alhambra Palace in Spain and the Darb-i Imam Shrine in Iran, have helped scientists understand what quasicrystals look like at the atomic level. In those mosaics, as in quasicrystals, the patterns are regular - they follow mathematical rules - but they never repeat themselves.
When scientists describe Shechtman's quasicrystals, they use a concept that comes from mathematics and art: the golden ratio. This number had already caught the interest of mathematicians in Ancient Greece, as it often appeared in geometry. In quasicrystals, for instance, the ratio of various distances between atoms is related to the golden mean.
Following Shechtman's discovery, scientists have produced other kinds of quasicrystals in the lab and discovered naturally occurring quasicrystals in mineral samples from a Russian river. A Swedish company has also found quasicrystals in a certain form of steel, where the crystals reinforce the material like armor. Scientists are currently experimenting with using quasicrystals in different products such as frying pans and diesel engines.
[ add comment ] ( 1699 views ) | permalink | ( 3 / 3171 )
The research teams raced to map the Universe by locating the most distant supernovae. More sophisticated telescopes on the ground and in space, as well as more powerful computers and new digital imaging sensors (CCD, Nobel Prize in Physics in 2009), opened the possibility in the 1990s to add more pieces to the cosmological puzzle.
The teams used a particular kind of supernova, called type Ia supernova. It is an explosion of an old compact star that is as heavy as the Sun but as small as the Earth. A single such supernova can emit as much light as a whole galaxy. All in all, the two research teams found over 50 distant supernovae whose light was weaker than expected - this was a sign that the expansion of the Universe was accelerating. The potential pitfalls had been numerous, and the scientists found reassurance in the fact that both groups had reached the same astonishing conclusion.
For almost a century, the Universe has been known to be expanding as a consequence of the Big Bang about 14 billion years ago. However, the discovery that this expansion is accelerating is astounding. If the expansion will continue to speed up the Universe will end in ice.
The acceleration is thought to be driven by dark energy, but what that dark energy is remains an enigma - perhaps the greatest in physics today. What is known is that dark energy constitutes about three quarters of the Universe. Therefore the findings of the 2011 Nobel Laureates in Physics have helped to unveil a Universe that to a large extent is unknown to science. And everything is possible again.
[ add comment ] ( 109 views ) | permalink | ( 3 / 3135 )
Scientists have long been searching for the gatekeepers of the immune response by which man and other animals defend themselves against attack by bacteria and other microorganisms. Bruce Beutler and Jules Hoffmann discovered receptor proteins that can recognize such microorganisms and activate innate immunity, the first step in the body's immune response. Ralph Steinman discovered the dendritic cells of the immune system and their unique capacity to activate and regulate adaptive immunity, the later stage of the immune response during which microorganisms are cleared from the body.
The discoveries of the three Nobel Laureates have revealed how the innate and adaptive phases of the immune response are activated and thereby provided novel insights into disease mechanisms. Their work has opened up new avenues for the development of prevention and therapy against infections, cancer, and inflammatory diseases.
[ add comment ] ( 126 views ) | permalink | ( 3 / 3154 )
Till nästa år ska jag nog anmäla mig till Lidingöloppet 15 (som är halva sträckan på 15 km), känns som att det skulle vara ett bra mål då banan är kuperad och därför utmanande. Nu ska jag träna vidare under hösten, försöa springa löpband i vinter och köra löpning och intervallträning nästa år för att komma i form för den tävlingen.
[ add comment ] ( 1003 views ) | permalink | ( 3 / 3174 )
[ add comment ] ( 95 views ) | permalink | ( 3 / 3134 )
[ add comment ] ( 429 views ) | permalink | ( 3.1 / 419 )
Katharina tävlade igår i Hanvikenspelen här i Tyresö. I ett något kallt och småblåsigt väder blev det 2,75 i längd vilket räckte till en 6:e plats. På 60m vann hon först försöksheatet tillbakalutad på 10,19 och i finalen spurtslog hon sina konkurrenter och noterade fina 10,05. Grattis till ännu en medalj :)
[ add comment ] ( 76 views ) | permalink | ( 3 / 376 )
[ add comment ] ( 391 views ) | permalink | ( 3 / 404 )
[ add comment ] ( 383 views ) | permalink | ( 3 / 390 )