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Tag: "replacing" at biology news

Alien plants attack using 'resource conservation' as weapon, researchers say

...ats and subsequently spread at a rapid rate, often replacing native species and reducing biodiversity. Invaders thrive best in regions where there is an abundance of materials for growth, such as water, nutrients and light. Biologists have long assumed that alien species pose less of a threat in resource-poor...

Newborn neurons like to hang with the 'in' crowd

... Neurodegenerative Diseases. "But if they are only replacing already existing connections there is less chance of error," he adds. Neurons make contact via specialized structures called synapses. As a signal traveling along a nerve branch arrives at the pre-synaptic area, it releases a chemical signal. The ...

Fish extinctions alter critical nutrients in water, study shows

... on the roles that surviving species might play in replacing the lost nutrients. In both ecosystems studied, when surviving species successfully picked up the slack in nutrient recycling left by an extinct species, nitrogen and phosphorus were maintained at 80 percent of their starting values until over half t...

Need oxygen? Cells know how to spend and save

...o when oxygen is scarce, cells appear to adjust by replacing one protein with an energy-efficient substitute that "is specialized to keep the motor running smoothly even as it begins to run out of gas," says Gregg Semenza, M.D., Ph.D., a professor of pediatrics and director of the vascular biology program in t...

Nanotextured implant materials: blending in, not fighting back

...ntly coming up with ways to repair the human body, replacing defective and worn out parts with plastic, titanium, and ceramic substitutes ?but the body does not always accept such substitutes seamlessly. Engineers from Brown and Purdue universities have found that simply changing the surface texture of implant...

Study shows hope for early diagnosis of Alzheimer's

...wan/Penn//Drexel group. “We don’t envision this replacing a neurologist,?Polikar said. “We hope it can serve as a first test for those folks who don’t have access to research facilities.?If the initial test indicates a possible problem, physicians could refer the patient to a research hospital for further e...

Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward

...e surrounding glaciers and more aquatic ecosystems replacing soil-based ecosystems." Lyons sees what is happening now looking similar to what existed during the Eemian warming period ?a time 130,000 years ago before the last major glacial stage. "We know that the climate was warmer then, sea levels were hi...

Producing medicines in plant seeds

...to other systems - normally, scientists succeed in replacing only 1% of the plant's proteins by the desired protein. Plant seeds are especially attractive as production units. In addition to a high production capacity, they offer other important advantages over other parts of the plant. The seeds can be st...

Stopping plants from getting sick

...se to invade plants and shut down seed production, replacing it with their own spores and causing the black masses of spores on wheat crops ?as he saw when he was a child. The fungi also sense lipids and phosphorous in the plant, meaning the right kind of fungicide might be developed to target that ability and...

Cryoablation -- A new treatment option for some kidney tumor patients

...tures of -100° C; and the tissue is then thawed by replacing the argon with helium. The procedure consists of two freezing and thawing cycles, seeking a frozen margin of approximately 5 millimeters beyond the tumor edge to ensure death of the entire tumor. After the cryoprobes are removed, small bandages are...

MIT bioengineer advances survival, promise of adult stem cells

...ries. Current treatment for such patients involves replacing the bone with either cadaver bone or, more commonly, a piece of the patient's hip bone. Ideally, surgeons would like to be able to aspirate bone marrow from the hip, which is a much less painful and invasive process than removing bone, and transpl...

Novel experiment documents evolution of genome in near-real time

...y of cellular process would be affected; it's like replacing the wiring system in a building when a light bulb burns out. But we repeated the experiment more than 50 times and mutations in the RNA polymerase gene appeared again and again." The researchers report that mutations in both genes appeared togethe...

Transplanted brain cells hold promise for Parkinson's disease

...c cells that occurs in Parkinson’s disease and for replacing cells lost to the disease, scientists say. Research published in the current issue of The Journal of Neuroscience shows a human neural stem cell transplant essentially enables an animal model for Parkinson’s to continue functioning normally rather ...

HIV gets a makeover

... around the intrinsic immunity of primate cells by replacing just a few parts of the human virus -- the ones responsible for blocking replication in monkey cells -- with components from SIV. "Overall, the virus is a mixture of engineering and forced evolution," Bieniasz says. "It sounds simple, in theory, but ...

The first tree genome is published: Poplar holds promise as renewable bioenergy resource

...gy Samuel W. Bodman has set a departmental goal of replacing 30 percent of current transportation fuel demand with biofuels by 2030. DOE scientists envision a future where vast poplar farms in regions such as the Pacific Northwest, the upper Midwest, and portions of the southeastern U.S. could provide a stea...

Long-term cancer risk follows stem cell transplant recipients

...'s own unhealthy stem cells in the bone marrow and replacing them with a compatible donor's stem cells offers the chance of cure for a disease that otherwise has a high mortality rate with non-transplant therapies. While the procedure can be lifesaving, it is associated with serious short-term adverse effects,...

MIT nanoparticles may help detect, treat tumors

...f carrying medicines that could kill cancer cells, replacing radiation or chemotherapy treatments that cause negative side effects such as hair loss or nausea. The researchers hold a provisional patent on their work. ...

Control measures fail to stop spread of new H5N1 virus

... emergence of FL-like viruses and their success in replacing other H5N1 variants in such a short time demonstrates how difficult it is to control H5N1 in China, Webster said. ...

Results with newer bladeless LASIK equivalent to standard microkeratome LASIK

... amount of corneal tissue by an excimer laser, and replacing the flap. In standard LASIK with a mechanical microkeratome, the flap is created by a blade; in bladeless LASIK, the newer type, the flap is created by a femtosecond laser. "At six months after surgery, there are no differences between the eyes tha...

'Smart' genetic therapy helps the body to heal itself

...ics in Amsterdam, The Netherlands. Instead of replacing a faulty gene (commonly referred to as gene therapy) these new 'smart' approaches make use of the therapeutic potential that already exists in human biology. Professor Brunhilde Wirth, from the Institute of Human Genetics, University of Cologne, Ger...

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