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Brain middle-aged people who are no longer agile as a young people's brain caused a;; the stree ever experienced. Similarly, a new study released on Tuesday (31 / 5) in the Journal of Neuroscience said.
Stress causes the brain nerve cells shrink and loss of plasticity (the ability to form relationships called synapses).
Results of research scientists United States that provide additional understanding about the aging process and why some people thinking ability is reduced more quickly than others.
"We suspect that the nerve cells (brain) changes due to age, but lose platisitas synapses in the context of life experience proved to have implications on the decline in thinking ability associated with age," said John Morrison of Mount Sinai School of Medicine.
Morrison and colleagues studied young rats, mice middle-aged and old mice are placed in an area for several hours, which can release stress hormones cause changes in brain cells in the prefrontal cortex or the brain that are used in the learning process.
The research team that examines changes in the brain cells called spines that are used to form synapses. When they saw through the microscope, they found changes in the spines of young rats, which suggests that they can adapt to stressful experiences.
Spines in the brains of middle-aged rats did not change much. While the spines of old rats nothing has changed.
From there concluded that the aging process causes a significant loss in the brain's ability to respond to stress, something very important in the learning process.
"Prefrontal cortex is constantly 'reconnect' in response to life experiences," said Morrison.
However, older brains are significantly losing spines, and if anyone still has, its ability less in response to situations that require the existence of 'reconnection' brain nerves.
"I will not attempt to learn the language (foreign)," Morrison said, given the brain's ability of parents to decline. "Some people can do it, but will not be like the kids abilities," said 58-year-old Morrison.
Fortunately though aging, a person will not lose his skill in doing something.
"You will not lose synapses and circuits that are very stable," said Morrison.
The findings are useful to better understand Alzheimer's disease. If you want to fight Alzheimer's, then one should do early prevention, said Morrison.
Alzheimer's a lot of attacking people who enter old age. Brain disease is shrinking in size and working ability of their brain decreased dramatically affecting the ability of other limbs. The patients, among others, will have difficulty in speaking, senile, unable to look after himself, it's hard to think, lost track of time and space, and easy to change interest, psychiatric conditions and personality .*
Suar (dust) solar unusually successful NASA space observatory observed. Pointed out, that solar storms can cause interference with satellite communications and energy on Earth during the next few days or more.
Loud explosions from the Sun has been releasing a storm of radiation at levels never witnessed since 2006, and will likely lead to geomagnetic storm activity, on Wednesday or Thursday pm tomorrow, according to the National Weather Service.
"This one is a little dramatic," said Bill Murtagh, a program coordinator at the Center for Space Weather Forecasting NWS solar flare as he described the M-2 (medium size) that peaked at 1:41 am U.S. Eastern time or 05:41 GMT.
"We see the initial flare up and it was not that big but it later emerged eruption associated with it - we get the radiation energy particles that flow in and we found a large corona mass injection," he said.
"You can see all the material erupted from the Sun so it is quite awesome to behold."
Solar dynamics observatory NASA launched last year and produced the pictures and high definition video about the incident, described as "visually impressive," but emphasized that the eruption did not directly lead to the Earth. Its influence is expected to minimal.
"Large cloud particles swell and fall back as if covering an area almost half the surface of the Sun," NASA said in a statement.
Murtagh said the space weather analysts look carefully to see whether the incident will cause a clash of the Sun and the Earth's magnetic field which was about 93 million miles (150 million kilometers).
"Part of our task here is to monitor and determine whether it is directed towards the Earth's events because it is basically the material that exploded out of the gas contains a combined magnetic field," he said.
"Within a day or more from now. We estimate some of the material that hit us and created a geomagnetic waves," he said.
"We do not expect it to be really devastating, but it could become a kind of multilevel moderate storm."
Space Weather Forecasting Centre said the event was "estimated to cause the level of geomagnetic storm activity G1 (minor) to G2 (moderate) tomorrow, June 8, starting at 18:00 GMT (Friday at 1 am GMT)."
Each of geomagnetic storm activity likely will be finished within 12-24 hours.
"Solar radiation storms include significant contributions from high energy protons, which first emerged since December 2006," said NWS.
A total of 12 satellites and spacecraft to monitor heliosfer and one instrument in particular in the review month of NASA's orbiter that measures radiation and its effects.
"Of course as long (two years) living this mission, the event is paramount," said Harlan Spence, principal investigator on the cosmic ray telescope for the influence of radiation or Crater.
"This is really interesting because, ironically as we develop the mission, at first we thought we would launch closer to the Sun, at best, when particles of this great sun appears," said Spence told AFP.
"Instead we drove into historic orbit the Sun, at least took so long to wake up," he said.
"It's interesting and important because it shows the Sun to return to a more active state."
The resulting geomagnetic storm could cause some disruption in the lattice energy satellites that operate "posotioning global system" and other devices, and can create some changes in flight routes across the pole, said Murtagh.
"Normally that would not cause a big problem, it only requires management," he said.
"If you fly from the United States to Asia, flying over the North Pole, there are more than a dozen flights per day," he said.
"During large radiation storms are some airlines will reroute flights away from polar regions for security reasons to ensure they can continue to communicate.
"The people who operate the satellite will also be watching this case because the geomagnetic storm could be contrary to the satellites in a variety of ways, both the satellite itself and the signal coming from the panel receiver (receiver)."
Aurora borealis (northern lights) and aurora australis (southern lights) are likely to also be seen in the last few hours on 8 or 9 June, so NASA .*
Released on Tuesday (19 / 4) by the National Institute on Aging and the Alzheimer's Association, guides the emergence of symptoms in the form of mild cognitive impairment or MCI's first-time symptoms more than a decade ago - as a precursor to disease.
In a recent study, known as preclinical Alzheimer's, early stage disease when clumps of protein called amyloid in the brain begin to form healthy people.
This preclinical phase of approximately 10 years before dementia began to appear and begin to do the handling. To these researchers usually bio PET scan, namely the spinal fluid tests and others to predict the emergence of Alzheimer's, a scan is important for researchers and drug companies.
Missing a signal sensitivity of dementia. The stages that mark the disease is different from the guidelines resulting from research conducted by government in 1984, which recognizes only the phase of Alzheimer's dementia when someone loses their memory and ability to care for oneself.
"The biggest difference between then and now is now we consider this process as a continuum that began many years before we make a diagnosis of dementia," said Dr. Guy McKhann of Johns Hopkins University School of Medicine, who worked with the new guidelines, told the media.
Observing the early stages of this disease is important for the next Alzheimer's research, says Dr. Reisa Sperling Brigham and Women's Hospital in Boston, who led the group that wrote the guidelines for preclinical Alzheimer's disease.
"If we are really going to move toward prevention of Alzheimer's disease, we must look at people who do not have symptoms," Sperling said in a telephone interview.
The word 'A' "I think a piece of reality that we are not afraid to dare to say 'A' (Alzheimer's)," said Sperling, who admitted that the diagnosis is frightening.
"I believe the change in cancer 10 or 20 years ago when people become less afraid to utter the word 'C' (cancer). I think it also should be in dealing with Alzheimer's disease," he said.
Sperling said, with the ability to diagnose a person in preclinical Alzheimer's disease, will enable much earlier treatment and prevention efforts. It just like people treating high cholesterol to prevent heart disease.
Sperling and Marilyn Albert of Johns Hopkins University School of Medicine in Baltimore, working under the guidelines in the form of mild cognitive impairment, the researchers said bio, which mentions, these results can not be applied at this time.
"We think, the results can not be used in raktik doctor today. Guideline standard is still not enough. We have not sort out, what is normal and what is not," said Albert.
In January, the Advisory Board of Food and Drug Administration rejected the U.S. agents who conduct the examination of the brain (Eli Lilly) because there are still a lot of data is required before it can be approved to help doctors get rid of the presence of plaques associated with Alzheimer's disease.
Dr. John Ringman, an Alzheimer's researcher at the University of California, Los Angeles, who was not involved in drafting the guidelines, said, defining the initial phase of the disease is a common vocabulary for researchers.
"(That there is today) is really a researcher of language in talking amongst each other," he said.
Ringman said, this will help companies choose the patients in the early stages of disease for clinical trials.
Many researchers believe, to treat Alzheimer's many failures when the disease is already in a further level to be the best way.
