Tag: "decline" at biology news
New technique helps shed light on progression of dementia
...irments and, ultimately, dementia after an initial decline
in the functions of nerve cells." The researchers sacrificed the microsphere-treated rats several weeks after surgery in order to look at cortical tissues, where acetylcholine is released. In the cortex, the density of axons that released acetylcholi...
Age-related decrease in physical ability may be in the genes
...hysical malfunctions due to aging were caused by a decline
in all cells, but newer views suggest that this isn't the case. Rather, the aging process appears to trigger some definite genetic changes in the brain, said Andrej Rotter, the study's lead author and a professor of both pharmacology and neuroscience...
Diet may improve cognition, slow aging, and help protect against cosmic radiation
...ntribute to aging, including the reduced cognitive decline
that typically develops with age. Studies suggest ...t has a protective effect on age-related cognitive decline
in general. Two years ago, researchers at the Universidad Nacional Autnoma de Mexico (UNAM) and the ...
Red sea urchins found to live up to 200 years
...eved they were at least partly responsible for the decline
of that marine ecosystem, so they tried to poison them, get rid of them however possible." But in the 1970s a commercial fishery developed in the U.S. based on sea urchins, which were sold primarily to Japan where their sex organs were considered a ...
Wolves are rebalancing Yellowstone ecosystem
...otential reasons that might explain the historical decline
of cottonwoods that began in the 1920s and have co.... "We now have a pretty good idea why they were in decline
and the return of wolves should help pave the way for their recovery. "Even though it may take a v...
How many fish in the sea? Census of Marine Life launches first report
...eefs in the Red Sea and Australia, but the rate of decline
was markedly similar worldwide. All reefs were substantially degraded long before outbreaks of coral disease and bleaching. CoML research shows that by the year 1600 the level of fishing in Northern Europe was already heavily impacting the ecosyst...
U-M scientists find genetic 'fountain of youth' for adult stem cells
...ility to copy itself. So their numbers continue to decline
gradually after birth. The differences become more apparent in adulthood. Compared to normal adult mice, Bmi-1-deficient mice have very few neural stem cells left." Although it had a major impact on the ability of neural stem cells to self-renew, lac...
New vaccines may address need to protect newborns in the developing world
...dies received from their mothers, these antibodies decline
in the first weeks and months of life as the fledgling immune system grows in its capacity to generate its own antibody protections against viruses. Between the waning of maternal-antibody protection and the development of a fully functional immune s...
New book says Northwest salmon could face same fate as those in Northeast, England
...these steps would halt the sharp salmon population decline
in the rivers. The year was 1715, and King George ...variety of historic documents, starting before the decline
of European salmon. The natural history of salmon wasn't apparent to Europeans of the 1400s, but mea...
Huge iceberg wreaks havoc on Antarctic marine ecosystem, study finds
... ice in 2000 and 2001 had resulted in a 40 percent decline
in phytoplankton productivity, which had a cascadi... a result, many Adlie colonies experienced a sharp decline
in 2000 and 2001, the authors said. "Considering that the calving of C-19 resulted in a far greater...
Sick Kids researchers link maternal folic acid intake to decrease in deadly childhood cancer
.... When a number of Sick Kids oncologists noticed a decline
in new neuroblastoma diagnoses, they sought to inv...cers that also have embryonal origins. However, no decline
in these cancers was noted after the folic acid food fortification program was introduced. "We need ...
Bones from French cave show Neanderthals, Cro-Magnon hunted same prey
...rayson said. He added that it is not clear if the decline
and eventual extinction of the bears was driven by an increase in the number of humans or increased human residence times in caves, or both. "If we can understand the extinction of any animal from the past, such as the cave bear, it gives us a piec...
Collapse of seals, sea lions & sea otters in North Pacific triggered by overfishing of great whales
...ystems. "The lightening rod issue in Alaska is the decline
of Steller sea lions," says Springer. "100 million dollars have been spent in the last three years to study Stellers because they are so intimately connected with species of commercial interest. But Stellers aren't the only species of marine mammals ...
Ocean plant life slows down and absorbs less carbon
... authors found nearly 70 percent of the NPP global decline
per decade occurred in the high latitudes (above 3...980s dataset with the late 1990s observations. The decline
in global ocean NPP corresponds with an increase in global sea surface temperatures of 0.36 degrees ...
JCI Table of Contents
...en lose CD28 expression. This is associated with a decline
in the ability of these cells to survive and proliferate. The study lends great insight into the maintenance of memory cells and their persistence at the site of chronic inflammatory disease. TITLE: CD28 costimulation independence of target organ ver...
Historical coral reef declines featured in this week's Science
...h, manatees and crocodiles began a process of reef decline
exacerbated in the modern era by continued overfis...f management confusion on the causes of coral reef decline
and will help advance the use of ocean use planning and zoning, particularly fishing prohibition zon...
Research: Coral reefs' decline actually began centuries ago
...e among the modern-day threats commonly blamed for decline
of coral reefs, but new research shows the downfal..."What really struck us was the universality of the decline
trajectories," said Karen Bjorndal, one of 12 authors on the paper and zoology professor and directo...
Long-term decline of coral reef ecosystems reported
...the Red Sea and Australia, but the trajectories of decline
were markedly similar worldwide. All reefs were su...d attention from the chronic and severe historical decline
of reef ecosystems." The authors state that the only reasonable explanation for this earlier decline...
Lake ecosystem critical to East African food supply is threatened by climate change
...or which data exists. The researchers believe the decline
is a direct result of the reduction in lake circul...ion. Based on earlier studiesof other lakes, that decline
would lead to a 30 percent reduction in fish stocks, in addition to any possible effects of over-fis...
Worm farmers wriggle into US market
...ed from the coast of Maine, and this has led to a decline
in availability of wild collected worms. 'Seabait Ltd, through its American subsidiary, will make good the supply of live worms for marine angling in the USA as well as providing additional material for supply in frozen form to the South Americas h...
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