Τετάρτη 22 Φεβρουαρίου 2012

ScienceDaily: Latest Science News

ScienceDaily: Latest Science News


Neuroscientists identify how the brain works to select what we (want to) see

Posted: 21 Feb 2012 06:26 PM PST

If you are looking for a particular object -- say a yellow pencil -- on a cluttered desk, how does your brain work to visually locate it? For the first time, neuroscientists have identified how different neural regions communicate to determine what to visually pay attention to and what to ignore. This finding is a major discovery for visual cognition and will guide future research into visual and attention deficit disorders.

Cocaine and the teen brain: New insights into addiction

Posted: 21 Feb 2012 06:26 PM PST

When first exposed to cocaine, the adolescent brain launches a strong defensive reaction designed to minimize the drug's effects, scientists have found. Now two new studies identify key genes that regulate this response and show that interfering with this reaction dramatically increases a mouse's sensitivity to cocaine.

Superbugs from space offer new source of power

Posted: 21 Feb 2012 06:26 PM PST

Scientists have created a "designer slime" that can double the electrical output of existing microbial fuel cells. Bacillus stratosphericus -- a microbe commonly found in high concentrations in the stratosphere orbiting Earth with the satellites -- is a key component of a new 'super' biofilm.

Caught in the act: Scientists discover microbes speciating

Posted: 21 Feb 2012 06:25 PM PST

Not that long ago in a hot spring in Kamchatka, Russia, two groups of genetically indistinguishable microbes decided to part ways. They began evolving into different species – despite the fact that they still encountered one another in their acidic, boiling habitat and even exchanged some genes from time to time, researchers report. This is the first example of what the researchers call sympatric speciation in a microorganism.

Stronger intestinal barrier may prevent cancer in the rest of the body, new study suggests

Posted: 21 Feb 2012 06:23 PM PST

Researchers have found that silencing a hormone receptor weakens the intestinal barrier, making the body more susceptible to cancer.

How good cholesterol turns bad

Posted: 21 Feb 2012 01:59 PM PST

Researchers have found new evidence to explain how cholesteryl ester transfer protein (CETP) mediates the transfer of cholesterol from "good" high density lipoproteins (HDLs) to "bad" low density lipoproteins (LDLs). These findings point the way to the design of safer, more effective next generation CETP inhibitors that could help prevent the development of heart disease.

Anticipation of stressful situations accelerates cellular aging

Posted: 21 Feb 2012 01:58 PM PST

The ability to anticipate future events allows us to plan and exert control over our lives, but it may also contribute to stress-related increased risk for the diseases of aging, according to a new study.

Technique creates piezoelectric ferroelectric nanostructures

Posted: 21 Feb 2012 01:58 PM PST

Researchers have developed a "soft template infiltration" technique for fabricating free-standing piezoelectrically active ferroelectric nanotubes and other nanostructures from PZT – a material that is attractive because of its large piezoelectric response.

Injectable gel could repair tissue damaged by heart attack

Posted: 21 Feb 2012 01:57 PM PST

Researchers have developed a new injectable hydrogel that could be an effective and safe treatment for tissue damage caused by heart attacks.

Gold coaxed into nanowires to allow inexpensive detection of poisonous industrial gases

Posted: 21 Feb 2012 12:15 PM PST

Researchers have coaxed gold into nanowires as a way of creating an inexpensive material for detecting poisonous gases found in natural gas.

Rare fungus kills endangered rattlesnakes in southern Illinois

Posted: 21 Feb 2012 12:15 PM PST

A small population of rattlesnakes that already is in decline in southern Illinois faces a new and unexpected threat in the form of a fungus rarely seen in the wild, researchers report. The finding matches reports of rattlesnake deaths in the northeast United States.

Cell energy sensor mechanism discovered

Posted: 21 Feb 2012 11:59 AM PST

Researchers have discovered more details about how an energy sensing "thermostat" protein determines whether cells will store or use their energy reserves. The researchers have shown that a chemical modification on the thermostat protein changes how it's controlled. Without the modification, cells use stored energy, and with it, they default to stockpiling resources. When cells don't properly allocate their energy supply, they can die off or become cancerous.

Fastest wind from stellar-mass black hole

Posted: 21 Feb 2012 11:58 AM PST

Astronomers have clocked the fastest wind yet discovered blowing off a disk around a stellar-mass black hole. This result has important implications for understanding how this type of black hole behaves.

Seven adult-sized humanoid robots together for first time in the U.S.

Posted: 21 Feb 2012 11:58 AM PST

Seven adult-sized humanoid robots took the stage during Drexel University's celebration of National Engineers Week in a first-of-its-kind assembly of robotic technology. Their presence -- together in one place -- is a unique event.

Origin of photosynthesis revealed: Genome analysis of 'living fossil' sheds light on the evolution of plants

Posted: 21 Feb 2012 09:54 AM PST

Evolutionary biologists have shed light on the early events leading to photosynthesis, the result of the sequencing of 70 million base pair nuclear genome of the one-celled alga Cyanophora. They consider this study the final piece of the puzzle to understand the origin of photosynthesis in eukaryotes.

Tohoku grim reminder of potential for Pacific Northwest North American megaquake

Posted: 21 Feb 2012 09:54 AM PST

The March 11, 2011 Tohoku earthquake is a grim reminder of the potential for another strong-motion mega-earthquake along the Pacific Northwest coast, geophysicists say.

Can consuming caffeine while breastfeeding harm your baby?

Posted: 21 Feb 2012 09:54 AM PST

Babies are not able to metabolize or excrete caffeine very well, so a breastfeeding mother's consumption of caffeine may lead to caffeine accumulation and symptoms such as wakefulness and irritability, according to an expert.

Plant toughness: Key to cracking biofuels?

Posted: 21 Feb 2012 09:52 AM PST

Along with photosynthesis, the plant cell wall is one of the features that most set plants apart from animals. A structural molecule called cellulose is necessary for the manufacture of these walls. Cellulose is synthesized in a semi-crystalline state that is essential for its function in the cell wall function, but the mechanisms controlling its crystallinity are poorly understood. New research reveals key information about this process.

Many young people don't know what constitutes sensible alcohol consumption

Posted: 21 Feb 2012 09:52 AM PST

A new study reveals that young people do not possess the knowledge or skills required to adhere to U.S. government guidelines for responsible alcohol consumption.

Rare element, tellurium, detected for the first time in ancient stars

Posted: 21 Feb 2012 09:51 AM PST

Researchers has detected the element tellurium for the first time in three ancient stars. Tellurium is rare on Earth.

Noninvasive method accurately and efficiently detects risk of Down syndrome, researchers say

Posted: 21 Feb 2012 09:51 AM PST

Using a noninvasive test on maternal blood that deploys a novel biochemical assay and a new algorithm for analysis, scientists can detect, with a high degree of accuracy, the risk that a fetus has the chromosomal abnormalities that cause Down syndrome and a genetic disorder known as Edwards syndrome. The new approach is more scalable than other recently developed genetic screening tests and has the potential to reduce unnecessary amniocentesis or CVS.

Is fructose being blamed unfairly for obesity epidemic?

Posted: 21 Feb 2012 09:50 AM PST

Is fructose being unfairly blamed for the obesity epidemic? Or do we just eat and drink too many calories? Researchers reviewed more than 40 published studies on whether the fructose molecule itself causes weight gain. In 31 "isocaloric" trials they reviewed, participants ate a similar number of calories, but one group ate pure fructose and the other ate non-fructose carbohydrates. The fructose group did not gain weight.

Step forward in effort to regenerate damaged nerves

Posted: 21 Feb 2012 09:50 AM PST

Scientists have taken a step forward toward the goal of repairing nerves in such patients more effectively. In a new study, researchers report that a surprising set of cells may hold potential for nerve transplants.

Does depression contribute to the aging process?

Posted: 21 Feb 2012 09:48 AM PST

Stress has numerous detrimental effects on the human body. Many of these effects are acutely felt by the sufferer, but many more go "unseen," one of which is shortening of telomere length.

Molecular basis of touch sensation: Researchers identify new function of a well-known gene

Posted: 21 Feb 2012 09:48 AM PST

A gene known to control lens development in mice and humans is also crucial for the development of neurons responsible for mechanosensory function, as neurobiologists have now discovered. They found that in mice in which they had removed the c-Maf gene in the nerve cells, touch sensation is impaired. This similarly applies to human carriers of a mutant c-Maf gene.

Irish mammals under serious threat from 'invasional meltdown'

Posted: 21 Feb 2012 09:48 AM PST

Some of Ireland's oldest inhabitants are facing serious threat and possible extinction because of foreign species, according to researchers.

Ant colonies remember rivals' odor and compete like sports fans

Posted: 21 Feb 2012 09:48 AM PST

A new study has shown that weaver ants share a collective memory for the odor of ants in rival nests, and use the information to identify them and compete, similar to how sports fans know each other instantly by their unique colors.

Gases drawn into smog particles stay there

Posted: 21 Feb 2012 09:48 AM PST

Airborne gases get sucked into stubborn smog particles from which they cannot escape, according to new findings. These finding could explain why air pollution models underestimate organic aerosols.

Scientists unlock evolutionary secret of blood vessels

Posted: 21 Feb 2012 09:48 AM PST

Scientists have shed light on how vertebrates evolved closed circulation systems designed to more effectively carry blood to organs and tissues.

Brain makes call on which ear is used for cell phone

Posted: 21 Feb 2012 09:47 AM PST

A new study finds a strong correlation between brain dominance and the ear used to listen to a cell phone, with more than 70 percent of participants holding their cell phone up to the ear on the same side as their dominant hand.

Evolution of staph 'superbug' traced between humans and livestock

Posted: 21 Feb 2012 09:47 AM PST

A strain of the potentially deadly antibiotic-resistant bacterium known as MRSA has jumped from livestock to humans, according to a new study.

Tadpoles adjust buoyancy to adapt to different environments

Posted: 21 Feb 2012 09:47 AM PST

Survival and reproduction of many aquatic and semi-aquatic animals can depend upon how well they float. Tadpoles use various strategies to attain buoyancy, depending upon their stage of development and location in still or turbulent waters. Researchers have taken a closer look at the developing frog's strategies to achieve buoyancy.

Implantable, wireless sensors share secrets of healing tissues

Posted: 21 Feb 2012 09:47 AM PST

A new implantable sensor can wirelessly transmit data from the site of a recent orthopedic surgery. Inexpensive to make and highly reliable, this new sensor holds the promise of more accurate, more cost-effective, and less invasive post-surgery monitoring and diagnosis.

Iconic marine mammals are 'swimming in sick seas' of terrestrial pathogens

Posted: 21 Feb 2012 07:41 AM PST

Parasites and pathogens infecting humans, pets and farm animals are increasingly being detected in marine mammals such as sea otters, porpoises, harbor seals and killer whales along the Pacific coast of the US and Canada, and better surveillance is required to monitor public health implications, according to a panel of scientific experts from Canada and the United States.

Robotic dinosaurs on the way for next-gen paleontology

Posted: 21 Feb 2012 07:40 AM PST

Researchers are bringing the latest technological advancements in 3-D printing to the study of ancient life. Using scale models of real fossils, for the first time, they will be able to test hypotheses about how dinosaurs and other prehistoric animals moved and lived in their environments.

Over-reactive parenting linked to negative emotions and problem behavior in toddlers

Posted: 21 Feb 2012 07:39 AM PST

Researchers have found that parents of young children who anger easily and overreact are more likely to have toddlers who act out and become upset easily.

Environmental pollutant level during pregnancy linked with grown daughters who are overweight

Posted: 21 Feb 2012 07:37 AM PST

The levels of the environmental pollutant perfluorooctanoic acid (PFOA) that mothers had in their blood during pregnancy increased the risk of obesity in their daughters at 20 years of age.

Hubble reveals a new class of extrasolar planet

Posted: 21 Feb 2012 07:37 AM PST

Observations by the NASA/ESA Hubble Space Telescope have come up with a new class of planet, a waterworld enshrouded by a thick, steamy atmosphere. It's smaller than Uranus but larger than Earth.

Eat and let die: Insect feeds on toxic plants for protection from predators

Posted: 21 Feb 2012 06:02 AM PST

Certain insects, such as the African variegated grasshopper or the cinnabar moth, native in Europe and Asia, feed on toxic plants in order to protect themselves from predators.

Taking Earth's pulse: Scientists unveil a new economic and environmental index

Posted: 20 Feb 2012 11:26 AM PST

A growing world population, mixed with the threat of climate change and mounting financial problems, has prompted researchers to measure the overall "health" of 152 countries around the world.

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