Science & Technology
Thu, 19 Mar 2009 01:35 UTC
Using a unique combination of microscopes, researchers at Ohio State University and their colleagues were able to glimpse how the Shewanella oneidensis bacterium breaks down metal to chemically extract oxygen.
The study, published online the week of March 16 in the journal Applied and Environmental Microbiology, provides the first evidence that Shewanella maneuvers proteins within the bacterial cell into its outer membrane to contact metal directly. The proteins then bond with metal oxides, which the bacteria utilize the same way we do oxygen.
Thu, 19 Mar 2009 00:30 UTC
Thu, 19 Mar 2009 00:08 UTC
"EU lawmakers should make sure that national authorities have the powers they need to act in cases where traffic management by telecommunication companies constitute unnecessary, discriminatory and/or anti-competitive behavior," the companies said in a joint statement.
On March 13, 1989 the entire province of Quebec, Canada suffered an electrical power blackout. Hundreds of blackouts occur in some part of North America every year. The Quebec Blackout was different, because this one was caused by a solar storm!
On Friday March 10, 1989 astronomers witnessed a powerful explosion on the sun. Within minutes, tangled magnetic forces on the sun had released a billion-ton cloud of gas. It was like the energy of thousands of nuclear bombs exploding at the same time. The storm cloud rushed out from the sun, straight towards Earth, at a million miles an hour. The solar flare that accompanied the outburst immediately caused short-wave radio interference, including the jamming of radio signals from Radio Free Europe into Russia. It was thought that the signals had been jammed by the Kremlin, but it was only the sun acting up!
On the evening of Monday, March 12 the vast cloud of solar plasma (a gas of electrically charged particles) finally struck Earth's magnetic field. The violence of this 'geomagnetic storm' caused spectacular 'northern lights' that could be seen as far south as Florida and Cuba. The magnetic disturbance was incredibly intense. It actually created electrical currents in the ground beneath much of North America. Just after 2:44 a.m. on March 13, the currents found a weakness in the electrical power grid of Quebec. In less than 2 minutes, the entire Quebec power grid lost power. During the 12-hour blackout that followed, millions of people suddenly found themselves in dark office buildings and underground pedestrian tunnels, and in stalled elevators. Most people woke up to cold homes for breakfast. The blackout also closed schools and businesses, kept the Montreal Metro shut during the morning rush hour, and closed Dorval Airport. Click here to view animation.
Wed, 18 Mar 2009 18:52 UTC
Taking atmospheric readings and photographs 20 miles above the ground, the Meteotek team of IES La Bisbal school in Catalonia completed their incredible experiment at the end of February this year.
Building the electronic sensor components from scratch, Gerard Marull Paretas, Sergi Saballs Vila, Marta Gasull Morcillo and Jaume Puigmiquel Casamort managed to send their heavy duty £43 latex balloon to the edge of space and take readings of its ascent.
the orders of the Egyptian queen.
The remains of Princess Arsinoe, put to death in 41BC on the orders of Cleopatra and her Roman lover Mark Antony to eliminate her as a rival, are the first relics of the Ptolemaic dynasty to be identified.
The breakthrough, by an Austrian team, has provided pointers to Cleopatra's true ethnicity. Scholars have long debated whether she was Greek or Macedonian like her ancestor the original Ptolemy, a Macedonian general who was made ruler of Egypt by Alexander the Great, or whether she was north African. Evidence obtained by studying the dimensions of Arsinoe's skull shows she had some of the characteristics of white Europeans, ancient Egyptians and black Africans, indicating that Cleopatra was probably of mixed race, too. They were daughters of Ptolemy XII by different wives.
Wed, 18 Mar 2009 04:11 UTC
According to researchers working in the exclusion zone surrounding Chernobyl, there is a "strong signal of decline associated with the contamination".
The team found that bumblebees, butterflies, grasshoppers, dragonflies and spiders were affected.
They report their findings in the journal Biology Letters.
Professor Timothy Mousseau from the University of South Carolina, US, and Dr Anders Moller from the University of Paris-Sud worked together on the project.
The two researchers previously published findings that low-level radiation in the area has a negative impact on bird populations.
The diminutive dinosaur likely hunted insects, small mammals and other prey, perhaps even baby dinosaurs, said Nick Longrich, a paleontology research associate in the University of Calgary's Department of Biological Sciences.
"It's basically a predator of small things," Longrich said.
Wed, 18 Mar 2009 01:39 UTC
Hidden by the region's lush vegetation for centuries, the paintings were discovered in caves located near the village of Tambolic, in the district of Jamalca, province of Utcubamba.