SAN FRANCISCO Air Jordans 1 For Sale , March 19 (Xinhua) -- Researchers at University of California, Berkeley have discovered that bacteria can repurpose a commonplace enzyme and use it as a scaffold on which to assemble iron atoms into tiny magnets.
With miniature magnets within themselves, the so-called magnetotactic bacteria are the ones able to navigate their environment using Earth's magnetic field as a reference.
Arash Komeili, an associate professor of plant and microbial biology Air Jordans 10 For Sale , and his colleagues at UC Berkeley initially found the repurposing of a deactivated enzyme in one species, Magnetospririllum magneticum.
However, when the researchers looked throughout the three largest families of magnetotactic bacteria, they found independent occurrences of the same story.
"We really thought that something this unusual would have evolved only once Air Jordans 6 For Sale ," said graduate student David Hershey. "That just isn't the case. It really just cements how unusual this process is."
A key feature of building magnetic particles is a protease - an enzyme that chews up proteins for recycling - that is deactivated.
The findings, based on X-ray crystallographic images and reported in this week's issue of the journal PLOS Biology, suggest that the scaffold protein, called MamO Jordan 6 Retro Gatorade Green For Sale , may guide iron atoms into position in the magnetite crystal lattice.
It demonstrates how evolution uses existing molecules for new functions.
The process for animals to build minerals is known as biomineralization. Magnetotactic bacteria, for example, snatch iron atoms and assemble them into magnetic nanoparticles, or tiny crystals of the mineral magnetite Jordan 6 Mens Gatorade Green For Sale , that connect with their nervous system.
"We would like to know how minerals are built in nature since they constitute a fundamental survival strategy for many organisms," Komeili said.
Knowing what is going on with bacteria, researchers may one day use the tricks to build unique magnetic minerals in a test tube that are otherwise not possible.
KAMPALA， July 11 (Xinhua) -- Uganda has dropped star athlete Moses Kipsiro from the team that will take part in the 2016 Rio Olympic Games in Brazil.
"Although Kipsiro qualified for the marathon of the Olympics he has been dropped because his time was the the best compared to the three runners who have been picked for the race，" President Uganda Athletics Federation (UAF)， Dominic Otuchet told Xinhua on Sunday.
Otuchet explained that the organizers of the games said only three runners can represent a country in the Olympics and Uganda picked 2012 London Olympics Olypics gold medalist Stephen Kirpotich， Solomon Mutai and Alex Chesakit. Seven athletes including the three time Commonwealth Games gold medal winner Kipsiro had qualified for the Games.
He explained that all athletes who are making the team will do it on merit according to the best times they set in the qualification for the Games. He also said some athletes had been dropped for the 10，000m team leaving only Joshua Cheptegei， Moses Kuron and Timothy Toriotich.
Although 21 athletes hit the qualifying mark for the Ugandan team， only 17 athletes have so far made the final team before the last day of qualification worldwide on July 11.
Besides the athletes two boxers Ronald Serugo and Kenneth Katende have also qualified for the Olympics. The 2016 Summer Olympic program slated to run August 7-21 features a total of 41 disciplines.
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