Tag: "wave" at biology news

Vaccination following spinal cord injury: Innovative Weizmann Institute approach limits paralysis

...e central nervous system (brain or spinal cord), a wave of damage spreads from the injury site over several days or weeks, killing nerve cells and fibers that survived the initial trauma. This secondary degeneration can be even more destructive than the initial damage. As a result, an injury that initiall...

Wave of the future? Dams as river restoration

For many years, society viewed dams as the wave of the future, providing hydroelectric power, water reserves and controlling floods. Now their removal, especially of older dams, appears to be the new trend. As dams are removed however, new issues begin to emerge, especially concerning the healt...

August media highlights GEOLOGY and GSA TODAY

...ess water under high pressure resides. Low seismic wave speeds and high electrical conductivity are the principal data presented as evidence. The source of the fluid is thought to be water released by greywacke-schist rocks as they are carried to great depth and thus squeezed in the collision zone. When f...

Burning now an option to clean up ocean oil spills previously thought incombustible

... opportunity for using burning is often limited by wave and wind conditions and by the proximity of the spill to populated areas. In addition, over time, oil spilled at sea becomes mixed with water forming an emulsion that is difficult or impossible to ignite. Now, Penn State researchers have widened t...

Humans hunted mammals to extinction in North America

...e Americas disappeared in a cataclysmic extinction wave at the very end of the Pleistocene, begins Alroy in the Science article. Some of the mammals that became extinct are: woolly mammoths Columbian mammoths American mastodons three types of ground sloths glyptodonts giant armadillos...

Penn paleontologists locate a new genus of colossal dinosaur along an ancient coastline

...ganic-rich mudstone showing clear evidence of weak wave action -- Smith's team deduced that the herbivore was standing on the edge of a tidal channel in very shallow water when it perished 94 million years ago. "The discovery of a huge sauropod, especially in a near-shore environment, is of great interest...

URI professor investigates the muscle behind blue mussels

... to adjust their attachment strength to prevailing wave conditions so that she can predict when mussels may be dislodged based on changes in wave activity. Since 1998, the URI biologist in the College of Arts and Sciences has monitored blue musse...

Collapse of simple life forms linked to mass extinction 200 million years ago

...ose by. The forests are virgin old growth, and the wave action is such that you can't get there by boat." Samples from a spot called Kennecott Point, in the northern Queen Charlottes, and from Kunga Island, about 100 miles to the southeast, showed a sharp decline in the presence of organic carbon, even at...

URI oceanographers discover how planetary waves affect phytoplankton production

...bservable only through satellite imagery. A Rossby wave can be hundreds of miles wide, but moves so slowly...months or years for it to cross the ocean. As this wave passes, it causes water motion that pumps more nutrients from the depths to the surface waters of th...

Measuring the muscle: new study by Scripps researchers depicts how the tuna's body is built for speed

... shorten and produce power, the burst is seen as a wave of contraction that causes the entire body to undulate. Tuna, however, contain swimming muscles located primarily in the central part of the body. Tendons that angle to the backbone link the muscle with the tail. Using ultrasound technology, Shad...

Electrophysiological differences of individuals at high risk for alcoholism

...s in chronic alcoholics for many years using brain wave recordings," said Bernice Porjesz, associate profe... to study is called 'mismatch negativity,' a brain wave that reflects the brain's detection of changes in the ongoing stream of sounds in the environment. ...

Elephants pick up good vibrations - through their feet

...ocalizations," she wrote, "a corresponding seismic wave is transmitted in the ground." To determine how far these seismic waves propagate, O`Connell-Rodwell and her coworkers conducted experiments with two female Asian elephants at a private training facility near Jefferson, Texas. They placed two microp...

Organgutan numbers plummeting worldwide; species may vanish in ten years, study says

...o one third of Borneo's orangutans died during the wave of forest fires that swept through the area in 1997-98. And a similar rash of illegal logging continues to affect the region -- all fueled by the state of political instability throughout Indonesia. To alleviate this desperate situation, WCS is call...

Infections may trigger autoimmunity via rare, but normal process

... infection in the mice. Normally, a powerful first wave of antibodies is produced by B cells in response t...ined a set of B cells that participate in a second wave of the immune response to infections. It has long been known that some of the B cells less vigorousl...

Why some people just can't seem to pay attention

...match negativity" (MMN), a negative-polarity brain wave elicited within 200 milliseconds by any change in stimulus. MMN is a pre-attentive ERP component that discloses different phases of detection and orientation to a stimulus change, such as a pitch change in a monotonously repeating sound. Researcher...

Can a vitamin a day help keep heart disease away?

...ope our finding will help those designing the next wave of homocysteine clinical trials," says Brahmajee Nallamothu, M.D., M.P.H., a cardiology fellow who began the study as a resident. The kind of research model used in the study is called a decision analysis. It's especially good in situations when ...

Huge new hydrothermal vent system found on seafloor

...d support dense mats of microbial communities that wave within the rising fluids. Downslope, hundreds of overlapping flanges form hydrothermal deposits reminiscent of hot spring deposits in Yellowstone National Park. During the Alvin dive, expedition leader Patrick Hickey collected rocks, fluids, and biol...

Hawaiian chemist honored for ocean research at Pacifichem 2000

...scientists believe the oceans may produce the next wave of treatments for a variety of incurable diseases. Scheuer will be honored during the International Chemical Congress of Pacific Basin Societies (Pacifichem 2000) meeting in Honolulu, December 14-19. A special recognition program will be held at 5:30...

Protein stimulates key link between nerve cells, suggesting possible target for mental retardation and nerve regeneration therapies

...another cell and yet another, ultimately causing a wave of reaction in the brain. Some neurotransmitters, such as GABA, carry inhibitory signals, reducing excitation and anxiety in the brain, and others, such as dopamine and serotonin, modulate the activity of neural circuits to influence mood and sl...

Cell death during mammary involution

...ls occurs in at least 2 defined stages: an initial wave of apoptic cell death that peaks 2 days after wean...n. Song and colleagues report here that the first wave of apoptosis requires the binding of the cell death regulatory protein Fas to its ligand FasL. By f...

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