Πέμπτη 20 Σεπτεμβρίου 2012

ScienceDaily: Latest Science News

ScienceDaily: Latest Science News


NASA Mars rover targets unusual rock enroute to first destination

Posted: 19 Sep 2012 05:19 PM PDT

NASA's Mars rover Curiosity has driven up to a football-size rock that will be the first for the rover's arm to examine. Curiosity is about 8 feet (2.5 meters) from the rock. It lies about halfway from the rover's landing site, Bradbury Landing, to a location called Glenelg. In coming days, the team plans to touch the rock with a spectrometer to determine its elemental composition and use an arm-mounted camera to take close-up photographs.

Climate scientists put predictions to the test

Posted: 19 Sep 2012 04:12 PM PDT

A study has found that climate-prediction models are good at forecasting long-term climate patterns on a global scale but lose their edge when applied to time frames shorter than three decades and on smaller geographic scales. The goal of the research was to bridge the communities of climate scientists and weather forecasters, who sometimes disagree with respect to climate change.

Arctic sea ice hits smallest extent in satellite era

Posted: 19 Sep 2012 04:12 PM PDT

The frozen cap of the Arctic Ocean appears to have reached its annual summertime minimum extent and broken a new record low on Sept. 16, the U.S. National Snow and Ice Data Center (NSIDC) has reported. Analysis of satellite data showed that the sea ice extent shrunk to 1.32 million square miles (3.41 million square kilometers).

Misinformation: Why it sticks and how to fix it

Posted: 19 Sep 2012 04:12 PM PDT

Childhood vaccines do not cause autism. Barack Obama was born in the United States. Global warming is confirmed by science. And yet, many people believe claims to the contrary. Why does that kind of misinformation stick? A new report explores this phenomenon, highlighting the cognitive factors that make certain pieces of misinformation so "sticky" and identifying techniques that may be effective in debunking erroneous beliefs.

DNA barcoding can ID natural health products

Posted: 19 Sep 2012 04:09 PM PDT

DNA barcoding has proven up to 88 percent effective in authenticating natural health products, according to a new study.

Ancient tooth may provide evidence of early human dentistry

Posted: 19 Sep 2012 04:09 PM PDT

Researchers may have uncovered new evidence of ancient dentistry in the form of a 6,500-year-old human jaw bone with a tooth showing traces of beeswax filling.

People change moral position without even realizing it

Posted: 19 Sep 2012 04:06 PM PDT

Shortly after expressing a moral view about a difficult topic, people may easily endorse the opposite view and remain blind to the psychological mismatch, according to new research.

Blind people develop accurate mental map by playing 'video' game

Posted: 19 Sep 2012 04:06 PM PDT

Researchers have developed a new "video" game for blind people that can help them learn about a new space using only audio cues.

Dyslexia cause may be different than previously thought

Posted: 19 Sep 2012 04:06 PM PDT

Dyslexia may result from impairment of a different linguistic system than previously thought, according to new research.

Climate change to fuel northern spread of avian malaria: Malaria already found in birds in Alaska

Posted: 19 Sep 2012 04:06 PM PDT

Malaria has been found in birds in parts of Alaska, and global climate change will drive it even farther north, according to a new study. The spread could prove devastating to arctic bird species that have no resistance to the disease, and may also help scientists understand the effects of climate change on the spread of human malaria.

Yogurt consumption, blood pressure, and incident hypertension

Posted: 19 Sep 2012 04:06 PM PDT

Adding more yogurt to your diet without increasing the number of calories you eat may help lower your risk of high blood pressure, according to new research.

Sesame and rice bran oil lowers blood pressure, improves cholesterol

Posted: 19 Sep 2012 04:01 PM PDT

People who cooked with a blend of sesame and rice bran oils saw a significant drop in blood pressure and improved cholesterol levels, according to new research.

Promise of cell therapy for bowel disease

Posted: 19 Sep 2012 04:01 PM PDT

New research shows that a special population of stem cells found in cord blood has the innate ability to migrate to the intestine and contribute to the cell population there, suggesting the cells' potential to treat inflammatory bowel disease (IBD).

Possible key to slow progression toward AIDS found

Posted: 19 Sep 2012 04:01 PM PDT

Although the average time between HIV infection and AIDS in the absence of antiretroviral treatment is about 10 years, some individuals succumb within two years, while so-called slow progressors can stay healthy for 20 years or longer. Researchers already know that many slow progressors carry a gene called HLA-B*57 (B57), an immune gene variant that is found in less than 5 percent of the general population but in 40 to 85 percent of slow progressors. Yet even among those with the B57 gene, the speed of disease progression can vary considerably. Now, scientists may have uncovered the key to this variation.

Emotional neglect in children linked to increased stroke risk later in life

Posted: 19 Sep 2012 04:01 PM PDT

Neurological researchers have found that people who were emotionally neglected as children may have a higher risk of stroke in later adulthood.

Test can help make diagnosis of Creutzfeldt-Jakob disease

Posted: 19 Sep 2012 04:01 PM PDT

A new guideline may help doctors in making the diagnosis of Creutzfeldt-Jakob disease.

Protecting our harbors and ships with a robotic tuna fish

Posted: 19 Sep 2012 04:01 PM PDT

For constricted and hard-to-reach underwater places where inspection and security is necessary, Homeland Security's BIOSwimmer is the perfect fish.

Genetic mutation may have allowed early humans to migrate throughout Africa

Posted: 19 Sep 2012 04:01 PM PDT

A genetic mutation that occurred thousands of years ago might be the answer to how early humans were able to move from central Africa and across the continent in what has been called "the great expansion," according to new research.

Tissue around tumor holds key to fighting triple negative breast cancer

Posted: 19 Sep 2012 04:00 PM PDT

A preclinical study found that decorin, a well-studied protein known to help halt tumor growth, induces a series of tumor suppressor genes in the surrounding tissue in triple negative breast cancer tumors to help stop metastasis.

New cranial neural crest cell line developed

Posted: 19 Sep 2012 11:21 AM PDT

Researchers have successfully developed a stable population of neural crest cells derived from mice that can be grown in large quantities in the laboratory and that demonstrates the potential to develop into many different cell types needed throughout the body.

The more people rely on their intuitions, the more cooperative they become

Posted: 19 Sep 2012 11:21 AM PDT

Researchers trying to answer an age-old question about human goodness have found evidence for a "cooperation reflex." They show that when self-interest goes up against the common good, our intuitions favor cooperation, while stopping to think leads to selfishness.

Medication effective in treating social withdrawal in Fragile X and potentially autism patients

Posted: 19 Sep 2012 11:21 AM PDT

An investigational compound that targets the core symptoms of fragile X syndrome is effective for addressing the social withdrawal and challenging behaviors characteristic of the condition, making it the first such discovery for fragile X syndrome and, potentially, the first for autism spectrum disorder, a study has found.

Reading food labels helps shoppers stay thinner

Posted: 19 Sep 2012 11:20 AM PDT

Shoppers —- particularly women —- who take the time to read food labels are thinner than those who don't.

Many parents believe that letting young children taste alcohol discourages later use

Posted: 19 Sep 2012 11:20 AM PDT

One in four mothers believe that letting young children taste alcohol may discourage them from drinking in adolescence and 40 percent believe that not allowing children to taste alcohol will only make it more appealing, according to a new study. The finding is noteworthy, the study's authors say, because early introduction to alcohol is a primary risk factor for problem drinking during adolescence.

Video games help patients and health care providers

Posted: 19 Sep 2012 11:20 AM PDT

Video games can be therapeutic and are already beginning to show health-related benefits, new research shows.

The 'slippery slope to slime': Overgrown algae causing coral reef declines

Posted: 19 Sep 2012 10:54 AM PDT

Researchers for the first time have confirmed some of the mechanisms by which overfishing and nitrate pollution can help destroy coral reefs -- it appears they allow an overgrowth of algae that can bring with it unwanted pathogens, choke off oxygen and disrupt helpful bacteria.

Ultra-distant galaxy discovered amidst cosmic 'dark ages': May be oldest galaxy ever

Posted: 19 Sep 2012 10:54 AM PDT

With the combined power of NASA's Spitzer and Hubble space telescopes as well as a cosmic magnification effect, a team of astronomers has spotted what could be the most distant galaxy ever detected. Light from the young galaxy captured by the orbiting observatories shone forth when the 13.7-billion-year-old universe was just 500 million years old.

Efficacy of drugs boosted by using nanoparticles to target 'powerhouse of cells'

Posted: 19 Sep 2012 10:54 AM PDT

Nanoparticles have shown great promise in the targeted delivery of drugs to cells, but researchers have refined the drug delivery process further by using nanoparticles to deliver drugs to a specific organelle within cells.

Using a laser to 'see' the smallest world: Powerful laser breathes new life into an old technology for studying atomic-level structures

Posted: 19 Sep 2012 10:54 AM PDT

A high-powered laser has dramatically improved one of the tools scientists use to study the world at the atomic level. Scientists used an amped-up electron paramagnetic resonance spectrometer to study the electron spin of free radicals and nitrogen atoms trapped inside a diamond.

How organisms evolve new functions: Evolution is as complicated as 1-2-3

Posted: 19 Sep 2012 10:54 AM PDT

Biologists have documented the step-by-step process in which organisms evolve new functions. The results are revealed through an in-depth, genomics-based analysis that decodes how E. coli bacteria figured out how to supplement a traditional diet of glucose with an extra course of citrate.

Odorant shape and vibration likely lead to olfaction satisfaction

Posted: 19 Sep 2012 10:53 AM PDT

A new study lends support to a controversial theory of olfaction: Our noses can distinguish both the shape and the vibrational characteristics of odorant molecules. The study demonstrates the feasibility of the theory – first proposed decades ago – that the vibration of an odorant molecule's chemical bonds – the wagging, stretching and rocking of the links between atoms – contributes to our ability to distinguish one smelly thing from another.

Oyster genome uncover the stress adaptation and complexity of shell formation

Posted: 19 Sep 2012 10:53 AM PDT

An international research team has completed the sequencing, assembly and analysis of Pacific oyster (Crassostrea gigas) genome -- the first mollusk genome to be sequenced -- that will help to fill a void in our understanding of the species-rich but poorly explored mollusc family. The study reveals the unique adaptations of oysters to highly stressful environment and the complexity mechanism of shell formation.

Human brains share a consistent genetic blueprint and possess enormous biochemical complexity

Posted: 19 Sep 2012 10:53 AM PDT

Human brains share a consistent genetic blueprint and possess enormous biochemical complexity, according to new research. The findings stem from the first deep and large-scale analysis of the vast data set publicly available in the Allen Human Brain Atlas.

Explosions are the main cause of spine injuries to wounded military personnel

Posted: 19 Sep 2012 10:53 AM PDT

Spinal injuries are among the most disabling conditions affecting wounded members of the US military. Yet until recently, the nature of those injuries had not been adequately explored.

New way proposed to save Africa's beleaguered soils

Posted: 19 Sep 2012 10:53 AM PDT

Researchers have made a case for a new type of agriculture that could restore the beleaguered soils of Africa and help the continent feed itself in the coming decades. Their system, which they call "perenniation," mixes food crops with trees and perennial plants, which live for two years or more.

Experiment corrects prediction in quantum theory

Posted: 19 Sep 2012 10:53 AM PDT

Scientists are rewriting a page from the quantum physics rulebook using a laboratory once dubbed the coldest spot in the universe.

Thermoelectric material is the best at converting heat waste to electricity

Posted: 19 Sep 2012 10:53 AM PDT

Scientists have developed a thermoelectric material that is the best in the world at converting waste heat to electricity. This is very good news once you realize nearly two-thirds of energy input is lost as waste heat. The material could signify a paradigm shift. With a very environmentally stable material that is expected to convert 15 to 20 percent of waste heat to useful electricity, thermoelectrics now could see more widespread adoption by industry.

Single-atom writer a landmark for quantum computing

Posted: 19 Sep 2012 10:53 AM PDT

Engineers have created the first working quantum bit based on a single atom in silicon, opening the way to ultra-powerful quantum computers of the future. Scientists were able to both read and write information using the spin, or magnetic orientation, of an electron bound to a single phosphorus atom embedded in a silicon chip.

Genetically-engineered preclinical models predict pharmacodynamic response

Posted: 19 Sep 2012 09:57 AM PDT

A new comparison of four different methodologies for pharmacokinetic and pharmacodynamic testing of the anti-melanoma agent carboplatin, demonstrates that genetically-engineered mouse models provide tumor delivery of drug most comparable to the response seen in melanoma patients.

Diseases of aging map to a few 'hotspots' on the human genome

Posted: 19 Sep 2012 09:57 AM PDT

Researchers have long known that individual diseases are associated with genes in specific locations of the genome. Genetics researchers have now have shown definitively that a small number of places in the human genome are associated with a large number and variety of diseases. In particular, several diseases of aging are associated with a locus which is more famous for its role in preventing cancer.

CT scan and 3-D print help scientists reconstruct an ancient mollusk

Posted: 19 Sep 2012 09:57 AM PDT

Using a combination of traditional and innovative model-building techniques, scientists have created a lifelike reconstruction of an ancient mollusk, a multiplacophoran, offering a vivid portrait of a creature that lived about 390 million years ago, and answering questions about its place in the tree of life.

Your memory is like the telephone game, altered with each retelling

Posted: 19 Sep 2012 09:57 AM PDT

Your memory is a lot like the telephone game, according to a new study. Every time you remember an event from the past, your brain networks change in ways that can alter the later recall of the event. The next time you remember it, you might recall not the original event but what you remembered the previous time. The Northwestern study is the first to show this and has implications for witnesses in criminal cases.

Weight gain worry for stressed black girls

Posted: 19 Sep 2012 09:57 AM PDT

Could the impact of chronic stress explain why American black girls are more likely to be overweight than white girls? Higher levels of stress over 10 years predict greater increases in body weight over time in both black and white girls. However, the experience of chronic stress appears to have a greater negative effect on black girls' weight.

Children with autism experience interrelated health issues

Posted: 19 Sep 2012 09:56 AM PDT

A new study found that many children with ASD also experience anxiety, chronic gastrointestinal problems and atypical sensory responses, which are heightened reactions to light, sound or particular textures. These problems appear to be highly related and can have significant effects on children's daily lives, including their functioning at home and in school.

Toward a better material for hip replacement and other joint implants

Posted: 19 Sep 2012 09:56 AM PDT

In an advance toward a new generation of improved hip and other joint replacements, scientists are describing development of a potential implant material that flexes more like natural bone, fosters the growth of bone that keeps implants firmly in place and is less likely to fail and require repeat surgery.

Revolutionary ultrathin, flat lens: Smartphones as thin as a credit card?

Posted: 19 Sep 2012 09:56 AM PDT

Scientists are reporting development of a revolutionary new lens -- flat, distortion-free, so small that more than 1,500 would fit across the width of a human hair -- capable in the future of replacing lenses in applications ranging from cell phones to cameras to fiber-optic communication systems. The advance could lead to smart phones as thin as a credit card.

Carbon dioxide from water pollution, as well as air pollution, may adversely impact oceans

Posted: 19 Sep 2012 09:56 AM PDT

Carbon dioxide (CO2) released into the oceans as a result of water pollution by nutrients -- a major source of this greenhouse gas that gets little public attention -- is enhancing the unwanted changes in ocean acidity due to atmospheric increases in CO2. The changes may already be impacting commercial fish and shellfish populations, according to new data and model predictions.

Fighting melanoma's attraction to the brain

Posted: 19 Sep 2012 09:56 AM PDT

A researcher is delving deeper into the way the brain attracts cancer cells, and his breakthrough is giving scientists new hope for better therapies.

Preemies' brains reap long-term benefits from Kangaroo Mother Care

Posted: 19 Sep 2012 09:56 AM PDT

Kangaroo Mother Care -- a technique in which a breastfed premature infant remains in skin-to-skin contact with the parent's chest rather than being placed in an incubator -- has lasting positive impact on brain development. Very premature infants who benefited from this technique had better brain functioning in adolescence -- comparable to that of adolescents born at term -- than did premature infants placed in incubators.

Neuroscientists investigate lotteries to study how the brain evaluates risk

Posted: 19 Sep 2012 09:53 AM PDT

A new video article uses functional magnetic resonance imaging to characterize subjective risk assessment while subjects choose between different lotteries to play.

Autistic adults have unreliable neural responses, research team finds

Posted: 19 Sep 2012 09:53 AM PDT

New research by neuroscientists takes the first step toward deciphering the connection between general brain function and the emergent behavioral patterns in autism. The study shows that autistic adults have unreliable neural sensory responses to visual, auditory and somatosensory, or touch, stimuli. This poor response reliability appears to be a fundamental neural characteristic of autism.

Scientists show biological mechanism can trigger epileptic seizures

Posted: 19 Sep 2012 09:53 AM PDT

Scientists have discovered the first direct evidence that a biological mechanism long suspected in epilepsy is capable of triggering the brain seizures – opening the door for studies to seek improved treatments or even preventative therapies. The researchers report that molecular disruptions in small neurons called granule cells – located in the dentate gyrus region of the brain – caused brain seizures in mice similar to those seen in human temporal lobe epilepsy.

Can post-breakup Facebook surveillance delay emotional recovery?

Posted: 19 Sep 2012 09:49 AM PDT

More than 900 million people worldwide are active users of the social networking site Facebook, and it is estimated that as many as one-third report using Facebook to check on the activities of former romantic partners. The effects of remaining Facebook friends with an ex-lover or even just following their activities online can disrupt a person's ability to heal emotionally and move on with his or her life, according to a new article.

Improved brain tumor diagnosis

Posted: 19 Sep 2012 09:49 AM PDT

New method of brain tumor diagnosis offers hope to tens of thousands of people.

Clenching left hand could help athletes avoid choking under pressure

Posted: 19 Sep 2012 09:49 AM PDT

Some athletes may improve their performance under pressure simply by squeezing a ball or clenching their left hand before competition to activate certain parts of the brain, according to new research.

Rx guide for high blood pressure

Posted: 19 Sep 2012 09:48 AM PDT

Blood pressure medications are currently failing millions of Americans, who continue to battle hypertension and remain at increased risk for heart attack and stroke.

Neuroscientists find promise in addressing Fragile X afflictions

Posted: 19 Sep 2012 09:48 AM PDT

Neuroscientists have devised a method that has reduced several afflictions associated with Fragile X syndrome (FXS) in laboratory mice. Their findings offer new possibilities for addressing FXS, the leading inherited cause of autism and intellectual disability.

New airport system facilitates smoother take-offs and landings

Posted: 19 Sep 2012 09:48 AM PDT

For airline passengers who dread bumpy rides to mountainous destinations, help is on the way. A new NCAR turbulence avoidance system has for the first time been approved for use at a U.S. airport and can be adapted for additional airports in rugged settings across the United States and overseas.

Major changes needed to protect Australia's species and ecosystems

Posted: 19 Sep 2012 07:36 AM PDT

Climate change is likely to have a major impact on Australia's plants, animals and ecosystems that will present significant challenges to the conservation of Australia's biodiversity, experts say.

New screening method identifies 1,200 candidate refrigerants to combat global warming

Posted: 19 Sep 2012 07:36 AM PDT

Researchers have developed a new computational method for identifying candidate refrigerant fluids with low "global warming potential" as well as other desirable performance and safety features.

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