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dead in Biological News

Smaller than expected, but severe, dead zone in Gulf of Mexico

NOAA-supported scientists, led by Nancy Rabalais, Ph.D., from the Louisiana Universities Marine Consortium (LUMCON), found the size of this year's Gulf of Mexico dead zone to be smaller than forecasted, measuring 3,000 square miles. However the dead zone, which is usually limited to water just abo...

Is the Dead Sea dying?

The water levels in the Dead Sea the deepest point on Earth are dropping at an alarming rate with serious environmental consequences, according to Shahrazad Abu Ghazleh and colleagues from the University of Technology in Darmstadt, Germany. The projected Dead Sea-Red Sea or Mediterranean-Dead Se...

Dramatic expansion of dead zones in the oceans

Unchecked global warming would leave ocean dwellers gasping for breath. Dead zones are low-oxygen areas in the ocean where higher life forms such as fish, crabs and clams are not able to live. In shallow coastal regions, these zones can be caused by runoff of excess fertilizers from farming. A tea...

Brown scientist finds coastal dead zones may benefit some species

PROVIDENCE, R.I. [Brown University] Coastal dead zones, an increasing concern to ecologists, the fishing industry and the public, may not be as devoid of life after all. A Brown scientist has found that dead zones do indeed support marine life, and that at least one commercially valuable clam act...

Playing dead is no game for ant survival

Pretending to be dead is an effective self-defense strategy adopted by young fire ant workers under attack from neighboring colonies. This tactic makes them four times more likely to survive aggression than older workers who fight back. As a result, these young workers are able to contribute to br...

Researchers confirm dead zone off Texas coast since 1985

COLLEGE STATION Researchers at Texas A&M University have confirmed for the first time that a dead zone has existed off the Texas coast for at least the past 23 years and will likely remain there, causing potential harmful effects to marine life in the area. Steve DiMarco, associate professor ...

Gulf of Mexico dead zone to be studied by University of Texas at Austin marine scientists

PORT ARANSAS, Texas University of Texas at Austin marine scientists have been awarded $781,000 by the National Oceanic and Atmospheric Association (NOAA) to better understand how nutrient pollution from the Mississippi River affects the large area of low oxygen water called the Dead Zone in the Gu...

Researchers to study why dead zone returned to Lake Erie

A $2.5 million grant will fund a 5-year study examining why dead zones have returned to Lake Erie, and researchers hope the findings will allow them to detect the cause and stop the spread before the fishery and tourism industries suffer. "This is a very serious problem," said University of Mich...

Gene therapy converts dead bone graft to new, living tissue

Researchers have created a way to transform the dead bone of a transplanted skeletal graft into living tissue in an experiment involving mice. The advance, which uses gene therapy to stimulate the body into treating the foreign splint as living bone, is a promising development for the thousands of ...

Carbon nanoparticles toxic to adult fruit flies but benign to young

...ienced a different fate. Tests showed adults immersed in tiny pits containing two varieties of carbon nanoparticles died within hours. Analyses of the dead flies revealed the carbon nanoparticles stuck to their bodies, covered their breathing holes, and coated their compound eyes. Scientists are unsure wh...

Symposium to discuss geoengineering to fight climate change at the ESA Annual Meeting

...an fertilization could create a rise in iron-limited phytoplankton populations, which by dying and sinking would use enough oxygen to create extensive dead zones in the oceans. In addition, he says, the maximum possible rate of ocean iron fertilization could only offset a small fraction of the current rat...

Sustainable agriculture at the ESA Annual Meeting

...round approaches. Soil bacteria can affect the growth and success of crop plants by fixing nitrogen, aiding in the uptake of nutrients and decomposing dead organic matter. Some current farming practices, however, may disrupt the soil ecosystem and decrease the effectiveness of the microbe community. In ...

August 2009 Geology and GSA Today media highlights

...on the climate at this time. The acidification events, which dissolved carbonate organisms on the seafloor, probably resulted from the accumulation of dead organic matter on the seafloor. Stronger offshore winds and increased primary productivity in the surface ocean off the west coast of Africa is likely...

Douglas-fir, geoducks make strange bedfellows in studying climate change

... 1,000 years in age, but geoducks rarely exceed 150 years. "Scientists at the Canadian Department of Fisheries and Oceans are dredging up shells of dead geoducks from the ocean floor," Black said, "and we hope we can append their growth patterns to chronology developed from live individuals. If so, it ...

New study ranks 'hotspots' of human impact on coastal areas

...Nutrient runoff from upstream farms has caused a persistent "dead zone" in the Gulf of Mexico, where the Mississippi runs into this body of water. The dead zone is caused by an overgrowth of algae that feeds on the nutrients and takes up most of the oxygen in the water. The authors state that they hav...

Pacific Northwest forests could store more carbon, help address greenhouse issues

... Among the findings of the report: About 65 percent of the live and dead biomass in this region is on public lands, while private lands often have y... hundreds of years to maximize carbon sequestration, the carbon in live and dead biomass could theoretically double in the Coast Range, west and east Cascad...

NOAA forecast predicts large 'dead zone' for Gulf of Mexico this summer

... summer could be one of the largest on record. The dead zone is an area in the Gulf of Mexico where season...Mississippi River since May may result in a larger dead zone. The largest one on record occurred in 2002, measuring 8,484 square miles. dead zones are caused by nutrient runoff, principally f...

Study highlights massive imbalances in global fertilizer use

...use up vast quantities of dissolved oxygen, producing a seasonal low-oxygen dead zone in the Gulf that in some years is bigger than the state of Connecticut...the Environment. However, environmental problems have not disappeared. "The dead zone in the Gulf of Mexico persists due to continued fertilizer runoff and ...

U-M researcher and colleagues predict large 2009 Gulf of Mexico 'dead zone'

... latest forecast, released today, calls for a Gulf dead zone of between 7,450 and 8,456 square miles---an ... of New Jersey. Most likely, this summer's Gulf dead zone will blanket about 7,980 square miles, roughl...e for second place on the list of the largest Gulf dead zones. It would also mean that the five largest...

New cleaning protocol for future 'search for life' missions

...ures, before any samples are collected. Importantly, this new procedure doesn't just sterilise, but it also cleans off any trace organic molecules of dead organisms," says Professor Benning. The work was carried out as part of the Arctic Mars Analog Svalbard Expeditions (AMASE) which uses Svalbard (a...

Midge keeps invasive mosquito in check, aiding native mosquitoes

...eggs in watery containers, including tires. Even if the water evaporates, a splash of rain and a supply of nutrients such as the microbes that feed on dead leaves are all that the larvae need to hatch and grow. Once found only in tropical and subtropical regions of Southeast Asia, the Asian tiger mosqu...

Studies shed light on collapse of coral reefs

...se problems may destroy reefs even when one cause by itself would not. Some estimates have suggested 20 percent of the world's coral reefs are already dead and an additional 24 percent are gravely threatened. The predicted acidification of the oceans in the next century is expected to decrease coral ca...

The challenges of avian influenza virus: Mechanism, epidemiology and control

...luenza in addition to the H5N1 virus. In 2005, even the natural reservoir host, migratory birds were found infected with an outbreak of more than 6000 dead birds involved. Therefore in this special topic, we invite scientists from Hong Kong and mainland China to review recent progress in the H5N1-related ...

Tips from the American Journal of Pathology

...e marrow) immune cells were involved in removal of dead retinal cells. The circulating cells entered the ... cells entered the blood stream after removing the dead cells. Joly et al suggest that this process m...sident microglia and bone marrow immigrants remove dead photoreceptors in retinal lesions. Am J Pathol 200...

Diuscovery in amber reveals ancient biology of termites

...ered of "mutualism," which is one type of symbiotic relationship in which two species help each other. "Termites live on cellulose, mostly from the dead wood they chew, but they depend on protozoa in their gut to provide the enzymes that can digest the wood," Poinar said. "These protozoa would die outs...

Findings uncover new details about mysterious virus

...'s lab. "The mimivirus is like an intermediate between a cell and a virus. We usually think of cells as being alive and a virus is thought of as being dead because it needs a host cell to complete its life cycle. The mimivirus straddles a middle ground between viruses and living cells, perhaps redefining ...

'First aid' for brain cells comes from blood

...produce much more inflammatory transmitters in the brain and blood. In addition, immune cells, whose task is to recognize and digest foreign bodies or dead cell material e.g. microglial cells or neutrophils are activated more strongly in the absence of Treg. Treg cells protect cells by suppressing t...

A dirty job but ...

... for cleaning the soil are very time-consuming, expensive and not completely effective. They strip the soil of all its basic compounds, leaving behind dead and useless sand. They also leave behind their own toxic byproducts and do not biodegrade. "These solutions solve one problem, but create others," say...

Bone deformities linked to inbreeding in Isle Royale wolves

...e found in the wolves as well. For the last 12 years, every one of the dead wolves the researchers have found has displayed bone deformities. In contr...only prey. During this year's Winter Study, Vucetich and Peterson found two dead wolves with misshapen vertebrae, one killed by other wolves and the other, ...

Research synthesis shines light on several management options after fires in diverse ecosystems

...ic systems are mostly negative. Most cavity-nesting birds and other animals that live in cavities are impacted by the harvesting of large standing dead trees. "There has been a lot of controversy about salvage logging over the past decade," says Peterson. "We want to ensure that the most recent sc...

Teeth of Columbus' crew flesh out tale of new world discovery

... MADISON The adage that dead men tell no tales has long been disproved by archaeology. Now, however, science is taking interrogation of the dead to new heights. In a study that promises fresh and perhaps personal insight...

Highlights from the March editions of ESA journals

...songbirds, at towers equipped with different combinations of red and white strobe-like, flashing or steady-burning lights. The researchers found fewer dead birds under towers equipped with only red or white flashing lights. Towers that were lit under the current Federal Aviation Administration (FAA) regul...

Synthesizing the most natural of all skin creams

...ease. Like most moisturising creams, VC is mostly water. Its outstanding properties come from the addition of just 10% each of lipid molecules and dead skin cells (corneocytes), so the exact composition of the mixture is important. For the lipids, X-ray diffraction measurements at the Dutch/Flemish...

Danger lurks underground for oak seedlings

...k mortality issues. Rathfon found in 2006 that animals, later determined to be pine voles, had been responsible for killing at least 19 percent of the dead oak seedlings observed in his study area. He said the voles, which are common to eastern deciduous forests, were likely responsible for the majority o...

Frog's immune system is key in fight against killer virus

...hich is estimated to be killing tens of thousands of frogs in the UK each year. When it strikes garden ponds, the surrounding lawn becomes strewn with dead frogs, some with skin ulcers so severe they reduce limbs to stumps, others with internal bleeding. The virus, called Ranavirus, has invaded the home c...

'Freaks' help scientist unravel nature and nurture

... -- to illustrate his belief that nature and nurture are inseparable and equally important to development. "To me, the nature-nurture debate is a dead end," said Blumberg, who teaches behavioral and cognitive neuroscience in the UI College of Liberal Arts and Sciences. "Asking whether something is mo...

UCLA stem cells scientists make electrically active motor neurons from iPS cells

...regulate muscle contraction. The study demonstrates the feasibility of using iPS-derived motor neurons and their progenitors to replace damaged or dead motor neurons in patients with certain disorders. It also opens the possibility of studying motor neuron-related diseases in the laboratory to uncover...

Great Lake's sinkholes host exotic ecosystems

...AGU). AGU is the world's largest organization of Earth and space scientists. The scientists report that some deep sinkholes act as catch basins for dead and decaying plant and animal matter and collect a soft black sludge of sediment topped by a bacterial film. In the oxygen-depleted water, cyanobacter...

Study links seabird deaths to soap-like foam produced by red-tide algae

... In late 2007, hundreds of dead and stranded seabirds washed up on the shores of Monterey Bay, their feathe...rproof plumage. A total of 550 birds were stranded alive and 207 were found dead during this event. Kudela teamed up with researchers from the California...

Ecologists report quantifiable measures of nature's services to humans

...rglades, agriculture has increased nutrient runoff into the Lake Okeechobee watershed since the 1940s, which has caused harmful algal blooms and ocean dead zones. State agencies are now developing a program to pay ranchers for ecosystem services produced by their lands, like water storage and filtration. ...
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