Tag: "dense" at biology news

Suppression Of Natural Fires Harms Squirrels

...earch of food or mates, their paths are blocked by dense stands of pine treesthat thrive in the absence of ...robably intermingled earlier inthe century, before dense conifer forests closed in, but that intermixing nolonger occurs. -- Squirrel populations as...

NYU Chemist Supports New Theory For Origin Of Life

... the right constituents andconditions: a liquid or dense gas medium (not necessarily water), a suitableenergy source, and a system of matter capable of using the energy to organizeitself. He calls this hypothesis the Life Principle. Furthermore, he arguesthat no predictable directions exist for life's la...

Vanderbilt Researcher: Human Brain Has Great Sense Of Timing

... Blake andLee created on a computer video screen a dense array of pinwheel-like objects,each spinning clockwise or counterclockwise. Each pinwheel changed its directionof rotation at random time intervals. When a cluster of pinwheels changed theirdirections at the same time, they appeared to form a coheren...

Building detailed map of human DNA will take more time and resources than previously thought, says Hutch researcher

...that from larger populations, requiring an equally dense map of SNPsto detect an association between a marker and disease." To be truly homogenous, or free of "background noise," a population must befounded by fewer than 100 people, Kruglyak estimates. Iceland, in contrast,sprung from a migration of more t...

Massive pollution documented over Indian Ocean

...DOEX scientists were surprised to find that such a dense pollutionlayer in the Indian Ocean was caused by sources at least a thousand or morekilometers away. They suggest that the pollution events observed in INDOEX maybe symptomatic of large-scale pollution transport that may be occurring in otherregions...

Do wildlife corridors work? Studying butterflies and fragments of open space

...habitat for thebutterflies, but were surrounded by dense areas of remaining pine plantation. Densely wooded areas are not hospitable to the two species, in part because theyoften lack the plants that the creatures need for food. Haddad and his team studied butterfly movement within 27 patches of open spac...

African dust called a major factor affecting southeast U.S. air quality

...ost of the African dust arrives. The dust causes a dense haze, butpeople who are unaware of the dust might mistake it for local pollution haze, hesays. In assessing an area's compliance with its PM 2.5 standard, EPA mayexclude exceptional natural events, such as volcanic eruptions, wild-land fires,...

Catastrophic draining of huge lakes tied to ancient global cooling event

...ools in the temperate North Atlantic, then becomes dense enough to sink andsend heat into the atmosphere, said Barber. Under normal conditions, winds blowing from the west across the Atlanticsend air warmed by the sea toward Western Europe, said Barber. About one-thirdof the heat that warms Wester...

Conserving the Everglades: Less is more

... low-phosphorus areas had unusually high levels of dense algae matsand unusually low levels of invertebrate...mes higher biomass). These areas were dominated by dense stands of cattails. "We think nutrient additions will ultimately lead to monocultures of cattailsth...

Microbes in basalt thrive on mixed diet of toxic waste

...rganic carbon and othernutrients, Holman says, but dense clusters of microorganisms live in the poresand fractures of the rock. "When water infiltrates from rain or melting snow, aburst of nutrients reaches them through fissures in the rock, and they bloomlike flowers in the desert" -- suggesting that micr...

Media Advisory: The Geological Society of America 1999 Annual Meeting

...within the fault. A third component,USArray, is a dense array of high-capability seismographs that will be deployedthroughout the United States. Principals representing each of these majorexperiments, as well as representatives from NSF, will be present to provideinformation and answer questions. To t...

USGS fire research in the southeast

...he said, it is extremely hardto eradicate, and its dense stands shade out the native prairie plants. "It'si... colonization process,before the tallow stands are dense enough to eliminate all the groundvegetation. With a sufficient supply of dry fuel underneath, Grace...

USGS studies wildfire ecology in the western United States

...s century. Eventually, open areas were replaced by dense tree stands. Allen says that historically, a typic...y sites exceed 2,000 stems per acre. In these dense forests, destructive insect outbreaks are common. And fires, when they do get established, now often...

Researchers solve vision mystery

...rnal Science. "By studying a group of infants with dense cataracts, we were able to determinethat it's visu...o ranged in age from 1 week to nine months old,had dense cataracts (in one or both eyes) that were surgically removed. Thebabies were then fitted with contac...

Huge Antarctic ice sheet could be in its death throes

...hick in places. Landpreviously weighed down by the dense ice has elevated since being freed from itsburden. The timing of deglaciation was determined by carbon-14 dating of samplesfound on raised beaches that are now up to 90 feet above present sea level. Other evidence comes from Roosevelt Island, an ice ...

Lizard research bolsters theory that forest edges are hotbeds of speciation

...o match the striped, reddish skink, throughout the dense rainforest and the open dry forest. By looking for the telltale bite marks created by bird bills, the researchers identified how many models were attacked. According to Schneider, it was no contest between the two sites. Twenty-one models were t...

Younger people are at greater risk for alcohol problems

...han genetic changes. Clearly an individual with a dense family history of alcoholism has a much greater risk for alcohol problems than an individual without that history. In the couple of generations involved in this study, however, there's no genetic change going on, so the effects have to be due to soc...

UNC-CH scientists create world's smallest pieces of ice

...nlike almost all other substances, it becomes less dense as it freezes, Miller said. As a result, ice floats instead of sinking. The more normal behavior is for solids to sink in their own liquid phases. "We know that when it freezes, water forms a unique hexagonal ring structure, which accounts for its l...

Obesity gene controls bone density via brain pathway

... also observed by X-ray analysis to have unusually dense bones. Further experiments confirmed that the lep...ning leptin circuit may be beneficial for building dense bone, the animals suffer the adverse effects of obesity and infertility. However, there is some enc...

Sewage in urban runoff may spur growth of harmful algal blooms

... blooms, of these single-celled plants, leading to dense patches of algae floating near the surface of the ocean that can double in size daily. While most blooms are not harmful, a small number of phytoplankton species can produce potent neurotoxins when they form into a bloom, sometimes poisoning or k...

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