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Tag: "loss" at biology news

Research: Snails were overlooked contributors to marsh destruction

...althy marsh in concentrated waves. The result: the loss of an estimated 250,000 acres of marsh stretching over 900 miles on the Gulf and southeastern coasts between 1999 and 2003. So says a paper set to appear Friday in the journal Science. "It's important to note that drought was the trigger that initi...

OHSU discovery sheds light into how stem cells become brain cells

...or instance, Parkinson's disease is related to the loss of dopamine-producing brain cells. Scientists hypothesize that it may be possible to correctly time the expression of brg-1 in neuronal stem cells either in a culture dish or in the brain to replace the lost dopamine-producing cells. Another possibil...

New study pinpoints epicenters of Earth's imminent extinctions

...rs note that current human-caused rates of species loss are 100-1,000 times greater than natural rates. In recent history, most species extinctions have occurred on isolated islands following the introduction of invasive predators such as cats and rats. This study shows that the extinction crisis has now ...

Pretreating rogue cancer cells with aspirin cripples their resistance to targeted therapy

...rs note that current human-caused rates of species loss are 100-1,000 times greater than natural rates. In recent history, most species extinctions have occurred on isolated islands following the introduction of invasive predators such as cats and rats. This study shows that the extinction crisis has now ...

Scientists show how thinking can harm brain cells

...o dendrites ?characterized by swelling or beading, loss of dendrite spines, and reduction in size ?is seen in HIV-1-associated dementia and Alzheimer's. In laboratory studies, brain cells and slices were exposed to platelet-activating factor, or PAF, a compound that promotes inflammation and plays many r...

UCR environmental scientists propose chemical solution to cleaning California's Salton Sea

...of polymer used increasingly for reducing sediment loss from agricultural fields. Results from the study ...ea being too salty for fish, resulting also in the loss of fish-eating birds frequenting an area that is home also to several endangered bird species and vi...

Sooner is better with cochlear implants, Stanford scientist shows

...ear implantation can have on children with hearing loss and it reinforces the importance of early detection and intervention for children with hearing loss. Children who need an implant would benefit from having it sooner rather than later, the authors conclude in their paper. As a developmental psycholo...

Getting old? Slowing down? Blame inefficient mitochondria

...as much oxygen at both ages. This represents a 50% loss in efficiency. "The best explanation for this loss of efficiency is that the mitochondria become leaky as they get old. Protons leak back into the mito...

New book on rain forests, slash-and-burn agriculture

...sts seeking to convert forests to agriculture. The loss of the forests threatens Earth's biodiversity and climate. The new book also identifies the costs and benefits of alternative uses of forests and cleared land in several benchmark sites throughout the developing world. It is based on the first decad...

Bird song changes sound alarm over habitat fragmentation

... first study to analyse the role played by habitat loss and fragmentation on song-matching. Ecologists re...e Doñana in Seville, Spain: "We found that habitat loss in the steppe matrix markedly affected song-type sharing mechanisms in Dupont's lark. The occurrence...

Pregnancy drugs can affect grandkids

... first study to analyse the role played by habitat loss and fragmentation on song-matching. Ecologists re...e Doñana in Seville, Spain: "We found that habitat loss in the steppe matrix markedly affected song-type sharing mechanisms in Dupont's lark. The occurrence...

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

...lled in aberrant deeper locations, indicating that loss of MDGA1 protein had stymied their attempt to travel the full distance to layer 2/3 and supporting the original hypothesis. The goal now is to determine how MDGA1 controls neuronal migration and what the long-term consequences are of its loss. Imp...

Pacific Islands paradise protected

...ing commercial fishing in the area, resulting in a loss of revenue that the Kiribati government would normally receive from issuing foreign commercial fishing licenses. However, an innovative plan will compensate Kiribati for these lost revenues. Under a memorandum of understanding signed by the Republi...

Learning and memory stimulated by gut hormone

...and an increased incidence of conditions of memory loss like Alzheimer's disease. ...

'Bad' enzymes may wear white hats after stroke

...cian-scientists. Just after a stroke--a temporary loss of blood to the brain caused by a clot or burst blood vessel--MMPs chew up damaged brain tissue. This increases the risk of swelling and hemorrhage in the brain. Some current stroke treatment research seeks ways to inhibit MMPs to minimize their dang...

Birds that make teeth

...id--about 70?0 million years ago. The evolutionary loss of teeth corresponded to the formation of the beak that is present in all living birds. Nonetheless, it has been known that if mouse tooth-forming tissue is in contact with bird jaw tissue, the bird tissue is able to follow the instructions given by ...

Marine mammals are on the frontline of failing ocean health

...ered to the food web, and thus to people. Habitat loss and increases in water temperature also allows both pathogens and disease vectors to move into new areas. "The rest of the world is likely to see similar changes as we go forward in time. We're just seeing change more rapidly in Alaska," says San...

Mice studies illustrate potential of chimp/human antibodies to protect against smallpox

...eive the antibodies--experienced continuous weight loss for five days after virus injection, which the res...fter virus exposure experienced only slight weight loss followed by rapid recovery. Conversely, all five of the mice that received 5 mg of VIG 48 hours afte...

Activation of a protein solidifies fear memory in the brain

... findings that suggest memories are susceptible to loss after retrieval, a mechanism that is required to m...e after retrieval of a memory can cause a specific loss of that memory," she said. Taylor and her colleagues found that within the amygdala, a brain region...

Cell therapy slows progression of an inherited neurological disease; Improves motor skills in mice

... the brain due to the lack of an enzyme and causes loss of the white matter or myelin protecting nerve fibers. Without myelin, nerves cannot conduct impulses to and from other areas of the body, resulting in symptoms including convulsions, seizures, personality changes, spasticity, progressive dementia, m...

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