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MessagePosté le: Mar 5 Juin - 04:26 (2018)    Sujet du message: next hours Comprar Nike VaporMax Negras Répondre en citant

WASHINGTON asics gel lyte iii negras baratas , Nov. 1 (Xinhua) -- Long-duration spaceflight may lead to "significant changes" in the structure of astronauts' brains, a U.S. study said Wednesday.

Many astronauts have been known to have experienced altered vision and increased pressure inside their heads during spaceflight aboard the International Space Station, a phenomenon known as visual impairment and intracranial pressure syndrome, or VIIP syndrome for short.

Given safety concerns and the potential impact to human exploration goals asics gel lyte iii grises baratas , the U.S. space agency NASA has made determining the cause of VIIP syndrome and how to resolve its effects a top priority.

"We know these long-duration flights take a big toll on the astronauts and cosmonauts," Donna Roberts, a neuroradiologist at the Medical University of South Carolina, who led the study asics gel lyte iii blancas baratas , said in a statement.

"However, we don't know if the adverse effects on the body continue to progress or if they stabilize after some time in space," Roberts said. "These are the questions that we are interested in addressing, especially what happens to the human brain and brain function?"

In the new study asics gel lyte iii españa , Roberts and colleagues compared the brain images of 18 astronauts who had been in space for short periods of time aboard the U.S. Space Shuttle to those of 16 astronauts who had been in space for longer periods of time, typically three months, aboard the International Space Station.

They evaluated the cerebrospinal fluid (CSF) spaces at the top of the brain and CSF-filled structures, called ventricles asics gel lyte iii baratas , located at the center of the brain.

In addition, the researchers paired the preflight and postflight magnetic resonance imaging (MRI) cine clips from high-resolution 3-D imaging of 12 astronauts from long-duration flights and six astronauts from short-duration flights and looked for any displacement in brain structure.

Study results confirmed a narrowing of the brain's central sulcus, a groove in the cortex near the top of the brain that separates the parietal and frontal lobes, in 94 percent of the astronauts who participated in long-duration flights and 18.8 percent of the astronauts on short-duration flights.

Cine clips also showed an upward shift of the brain and narrowing of the CSF spaces at the top of the brain among the long-duration flight astronauts but not in the short-duration flight astronauts.

In ground-based experiments that required participants to stay in bed and keep their heads continuously tilted in a downward position to simulate the effects of microgravity for 90 days onitsuka tiger track españa , the team also saw evidence of brain shifting and a narrowing of the space between the top of the brain and the inner table of the skull.

These results confirmed that "significant changes in brain structure occur during long-duration space flight," the researchers said.

"More importantly, the parts of the brain that are most affected -- the frontal and parietal lobes -- control movement of the body and higher executive function. The longer an astronaut stayed in space, the worse the symptoms of VIIP syndrome would be."

To further understand the results of the study asics onitsuka tiger track baratas , the team planned to compare repeated postflight imaging of the brains of astronauts to determine if the changes are permanent or if they will return to baseline following some time back on Earth.

"This study represents the most comprehensive assessment of the impact of prolonged space travel on the brain," study co-author Michael Antonucci of the Medical University of South Carolina said.

"The changes we have seen may explain unusual symptoms experienced by returning space station astronauts and help identify key issues in the planning of longer-duration space exploration, including missions to Mars."

The findings were published in the New England Journal of Medicine.

WASHINGTON, July 7 (Xinhua) -- A U.S. South Carolina state prisoner who escaped from a maximum-security prison for the second time earlier this week was recaptured in the state of Texas onitsuka tiger tokuten españa , authorities said Friday.

"Escaped inmate Jimmy Causey was apprehended and is no longer at large," the South Carolina Department of Corrections said in a tweet early Friday.

An agency spokesperson said 46-year-old Causey was apprehended by the Texas Department of Public Safety at around 3 a.m. (0800GMT). But there are no further details available on his apprehension.

Causey was serving life sentences in the Liebert Correctional Institution in Ridgeville, about 48 km northeast of Charleston, for holding a Columbia lawyer and his family at gunpoint in their home in 2004.

Causey was found missing from the South Carolina prison at around 2 p.m. (1900GMT) Wednesday. Authorities are still trying to figure out how he had managed to escape.

On Thursday asics onitsuka tiger tokuten baratas , state officials sought the public's help for Causey's apprehension, but asked anyone who sees him to call the police rather than approach him.

This is the second time that Causey broke out of prison. In 2005, a year after he entered prison, he and a fellow inmate escaped from Broad River Correctional Institution in Columbia by hiding in a dumpster carried off by a trash truck.

They were recaptured at a motel about 160 kilometers away from Broad River after a three-day manhunt by authorities.

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MessagePosté le: Mar 5 Juin - 04:26 (2018)    Sujet du message: Publicité

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