Tag: "hemisphere" at biology news
Wetlands clean selenium from agricultural runoff
...ealthy." Terry noted that the air in the northern hemisphere
already contains about 10,000 metric tons of volatile selenium from volcanoes, soil and plants. "The amount of dimethyl selenide released by wetlands would be negligible in comparison," he said. The researchers are studying ways - including using ge...
Three inferior prefrontal regions of the brain found receptive to somatosensory stimuli
...derlying frontal operculum. In contrast, the left hemisphere
equivalent only reached statistical significance in one comparison. A second strong area of activation localized to the OFC. In all cases the activation included the right anterior orbital gyrus and the neighboring lateral orbital gyrus. Additional...
Large-scale climate change linked to simultaneous population fluctuations in arctic mammals
...nter weather in Greenland and much of the northern hemisphere
is the North Atlantic Oscillation (NAO). "The North Atlantic Oscillation can be pictured as a fluctuating pressure corridor that squeezes and channels the westerly winds between North America and northern Europe, influencing the direction and speed ...
Wild plant or food plant?
...after the last ice age, inhabitants of the western hemisphere
began to select and cultivate food plants. Plant remains at archaeological sites may not be well preserved, but features often contain phytoliths, tiny silica dioxide deposits from plant tissues. These destinctive microfossils have been used increas...
Large volcanic eruptions affect the 'greener greenhouse'
Last year, scientists discovered that the northern hemisphere
was becoming increasingly greener due to increased... following Pinatubo, the land mass of the northern hemisphere
actually acted as a "carbon sink," where more carbon was taken in than was given out. The Pinatubo ...
New research sheds light on earth's largest animals
...eet and 80 tons, while blue whales in the southern hemisphere
may reach 100 feet and 120 tons. An estimated 7,0008,000 true blue whales are thought to live throughout the world. Mate's research is funded by the Marine Mammal Endowment at Oregon State University and by the Office of Naval Research....
Researchers link migratory birds' winter, summer ranges
...me of the most severe deforestation in the western hemisphere
has occurred in Haiti on the island of Hispaniola, and our results suggest a possible connection between this and declines in the southern breeding population of black-throated blue warblers." The project initially developed as a collaborative effor...
Gondwana split sorts out mammalian evolution
...go during the Cretaceous in Gondwana (the southern hemisphere
super-continent that incorporated Africa, Antarcti...here, as is commonly believed, but in the southern hemisphere
instead, in Gondwana," says Springer. "Furthermore, our study provides the first convincing molecul...
DNA deletion offers new evidence of mammals' origins
...here did each group originate? One in the southern hemisphere
and the other in the northern hemisphere. On the classic trees, the northern and southern groups are mixed up." Geological evidence supports the phylogenies as well. Mammals first appeared in the fossil record about the time continents were splittin...
A bizarre new predatory dinosaur unearthed on Madagascar
...n as abelisauroids, and recovered only on southern hemisphere
landmasses. In particular, the fossils of Masiaka...atory dinosaurs spread across much of the southern hemisphere
toward the end of dinosaur times, paralleling the Late Cretaceous radiations of small-bodied theropo...
New predatory dog-sized dinosaur unearthed on Madagascar
...atory dinosaurs spread across much of the southern hemisphere
toward the end of dinosaur times, paralleling the Late Cretaceous radiation's of small-bodied theropods (such as dromaeosaurids and ornithomimids) in the northern hemisphere. In addition, the broad geographic distribution of these small-bodi...
October Geology and GSA Today highlights
...mely fast supercooling of water in the anti-Jovian hemisphere
of Europa: A speculative model for the fracturing pattern and ascent of brines along cracks. Roberto Oyarzun et al. Europa, the icy moon of Jupiter, displays a complex array of fractures, including roughly concentric and arcuate fractures. The geome...
Turning down the Sun
...un, on the other hand, shines more in the northern hemisphere
in June, more in the southern hemisphere
in December. Surely, thought Caldeira, these very different phenomena couldn't exactly cancel each o...
Plankton are not affected by ozone depletion
...f phytoplankton growth over a year in the southern hemisphere
before and after the ozone hole appeared in the 19...tions before the hole appeared. Over the southern hemisphere
ecosystem as a whole, they found that primary phytoplankton production decreased by only about 1 per...
On the scent
...on to its own side of the brain. Because the right hemisphere
of the brain controls emotional processing, this c...nal reaction to an odour actually depends on which hemisphere
does the processing," Cahill concludes. He hopes to use brain imaging to watch how the two hemispher...
One theory solves two ancient climate paradoxes
...ing the earth 70 degrees gives large parts of each hemisphere
24 hours of sunlight for three months. If this sunlight were to fall on land, temperatures would be hotter than 125 degrees Fahrenheit in summer, but, because land cools very rapidly, during the three-month, 24-hour night, the temperatures would plum...
USGS reports that West Nile virus goes beyond crows
...le virus will find a permanent home in the western hemisphere
and what impact it will have on our native species. Periodically, the USGS issues Wildlife Health Alerts to keep natural resource agencies appraised of wildlife health or disease issues that may threaten free-ranging and captive wildlife. USGS, ...
Massive pollution documented over Indian Ocean
... becarried to the Indian Ocean during the northern hemisphere
winter by monsoonwinds from the northeast. Preliminary results indicate that aerosols in thepolluted region scatter the incoming solar radiation and reduce the amount ofenergy absorbed by the ocean surface by as much as 10 percent. "If you c...
The Sagan criteria for life revisited
... -- Earth. Above: This view of Earth's southern hemisphere
centered on the South Pole was created using images from the Galileo spacecraft taken during the December 1990 flyby. When the Galileo spaceprobe swooped by Earth in 1990, all its instruments were pointed towards us. As Galileo flew toward our pla...
INDOEX Researchers Document The Impact Of Pollutants On Climate Processes Over The Tropical Indian Ocean
... becarried to the Indian Ocean during the northern hemisphere
winter by monsoonwinds from the northeast. The Indian Ocean Experiment is investigating how thesepollutants are transported through the atmosphere and how they affect theatmospheric composition and solar radiation processes over the ocean. A majorobj...
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