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Tag: "zone" at biology news

MIT researcher presents new view of how the cortex forms

...sk-specific regions of the cortex are spawned by a zone of "originator" cells; or that long nerve fibers from the thalamus, a large ovoid mass that relays information to the cortex from other brain regions, are activated by external stimuli to impose identity on the homogeneous blob. New evidence indicat...

Travelers can avoid jet lag by resetting their body clocks

... people adapt to night shift work or to a new time zone following rapid transmeridian jet travel. Melaton...they should be completely adjusted to the new time zone before they fly," she added. "However, even following the schedule for a few days before flying wou...

Why the Amazon rainforest is so rich in species

...erence in numbers of species between the temperate zone and tropical South America can be explained by mass extinctions caused by the glaciations. Most species living in North America and Europe are relatively recent arrivals because the original inhabitants were wiped out by those ice ages. They haven't ...

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

... zones, they may not be able to migrate out of the zone and their reproduction will be impaired." Hypoxi...ers. In the Gulf of Mexico, for instance, a dead zone the size of New Jersey, some 7,000 square miles, develops each summer. Other affected areas of the U...

Neurons find their place in the developing nervous system with the help of a sticky molecule

... The neocortex develops outward from an underlying zone of cells. From that zone, crawling neurons migrate radially out toward the surface or "superficial" part of the developing cortex, giving rise to a laminar structure. Neurons forming layers 2 and 3, the focus of the current study, are born last and s...

'Bad' enzymes may wear white hats after stroke

...s involved in stroke recovery. "The peri-infarct zone is very dynamic and potentially very malleable for long periods of time after stroke," said Lo. "I think that makes a big difference in how we think about treatment. "One of the biggest problems facing stroke patients is that it's a neurodegenerativ...

Parts of the Caribbean and Central America are likely to have less summer rain

...or whether the wind is blowing past the convection zone without going into it -- can cause one model to have a drought in a particular region, while another model does not. You have to be careful when talking about precipitation; there is natural variability, from year to year and from decade-to-decade." ...

New fruit fly protein illuminates circadian response to light

...changes brought on by travel, namely from one time zone to another. A mutant fruit fly that possesses jetlag-like behaviors enabled senior author Amita Sehgal, PhD, Professor of Neuroscience at Penn and a Howard Hughes Medical Institute (HHMI) Investigator, and colleagues to identify the gene and subsequ...

Marine 'dead zone' off Oregon is spreading

...r for the first time, the effect of the low-oxygen zone is also being seen in coastal waters off Washingto...akes determining the size and movement of the dead zone difficult, although some new instrumentation being used this year by OSU scientists is helping. Diss...

Insect predation sheds light on food web recovery after the dinosaur extinction

... and insects. The Western Interior U.S. was a dead zone for plants and plant-insect food webs," said Dr. Peter Wilf, assistant professor of geosciences and the David and Lucile Packard Fellow. "We know that right after the extinction, for 800,000 years, there was very low insect predation and plant diver...

Brazil creates buffer zone around coral reefs off Atlantic coast

...razilian government has created an official buffer zone around the Abrolhos National Marine Park to protec...ities required for any economic use. "The buffer zone will guarantee the biodiversity integrity in the Park and ensure that local communities can continue...

Possible birthplace of malignant brain tumors identified

... the PDGFRá-containing cells in the subventricular zone (SVZ) of the brain, which is the center for production of new brain cells in adults. The researchers also found that infusing PDGF into mouse brain caused abnormal growth--called hyperplasia--of tumor-like nodules that invaded surrounding brain tis...

Dolphins at risk

... and suspended during calving season, an exclusion zone should be monitored before any activity starts and marine work should cease if a dolphin enters the work area. Other innovative ideas include creating an air bubble curtain and creating a ramped warning signal to give dolphins time to leave the area ...

South Pacific plant may be missing link in evolution of flowering plants

... and suspended during calving season, an exclusion zone should be monitored before any activity starts and marine work should cease if a dolphin enters the work area. Other innovative ideas include creating an air bubble curtain and creating a ramped warning signal to give dolphins time to leave the area ...

Exxon Valdez oil found in tidal feeding grounds of ducks, sea otters

...during the lowest tides. This biologically diverse zone is a prime feeding ground for sea otters, ducks and other wildlife. Previously, scientists believed most of the oil was deposited on beaches at higher tide levels.> The researchers randomly dug 662 pits along 32 stretches of shoreline on nort...

A new view on Lyme disease: Rodents hold the key to annual risk

...r a 13-year period in southeastern New York, a hot zone for the disease. Combining field data with computer simulations, they analyzed trends in interannual variation and found two powerful predictors of entomological risk of Lyme disease in a given year: abundance of tick hosts--white-footed mice and chi...

Neural stem cells lend the brain a surprising capacity for self-repair

...n a portion of the brain termed the subventricular zone (SVZ) when they administered a particular drug. The SVZ is known to be a site, or niche, that contains neural stem cells after birth. In newborn mice, loss of the genes left the SVZ "greatly disturbed," Jan said. Their results indicated that Numb...

Researchers to study why dead zone returned to Lake Erie

...roject. "In the 1960s and 1970s the Lake Erie dead zone was a key driver for enacting the Clean Water Act ...and the surprise is in the last few years the dead zone is back." Researchers from U-M, the Cooperative Institute for Limnology and Ecosystems Research, N...

Ocean's 'twilight zone' may be a key to understanding climate change

...e from the air to the deep ocean. "The twilight zone is a critical link between the surface and the dee...al Transport In the Global Ocean). The twilight zone acts as a gate that allows more sinking particles through in some regions and fewer in others, compl...

How to manage forests in hurricane impact zones

...ith salvage. "Stands within a hurricane damage zone that are not salvaged will require monitoring for up to 5 years to detect delayed mortality or the onset of insect infestations or diseases," says Stanturf. "Beyond the initial flurry of cleanup and salvage logging, the recovery process will take man...

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