الجمعة، 17 يناير 2014

ScienceDaily: Top News

ScienceDaily: Top News


Egypt: Sarcophagus leads to the tomb of a previously unknown pharaoh, from 3,600 Years Ago

Posted: 16 Jan 2014 04:03 PM PST

Archaeologists working at the southern Egyptian site of Abydos have discovered the tomb of a previously unknown pharaoh: Woseribre Senebkay -- and the first material proof of a forgotten Abydos Dynasty, ca. 1650-1600 BC.

Genomes of modern dogs and wolves provide new insights on domestication

Posted: 16 Jan 2014 04:01 PM PST

Dogs and wolves evolved from a common ancestor between 9,000 and 34,000 years ago, before humans transitioned to agricultural societies, according to an analysis of modern dog and wolf genomes from areas of the world thought to be centers of dog domestication.

Violence, infectious disease and climate change contributed to Indus civilization collapse

Posted: 16 Jan 2014 01:20 PM PST

A study of skeletal remains from the ancient city of Harappa provides evidence that inter-personal violence and infectious diseases played a role in the demise of the Indus Civilization.

Natural 3-D counterpart to graphene discovered: New form of quantum matter

Posted: 16 Jan 2014 12:08 PM PST

A natural 3-D counterpart to 2-D graphene with similar or even better electron mobility and velocity has been discovered. This discovery promises exciting new things to come for the high-tech industry, including much faster transistors and far more compact hard drives.

Understanding collective animal behavior may be in the eye of the computer

Posted: 16 Jan 2014 10:10 AM PST

An international team of researchers is the first to successfully apply machine learning toward understanding collective animal behavior from raw data such as video without tracking each individual. The findings stand to significantly impact the field of ethology -- the objective study of animal behavior -- and may prove as profound as the breakthroughs that allowed robots to learn to recognize obstacles and navigate their environment.

Sudden thickening of complex fluids modeled

Posted: 16 Jan 2014 10:08 AM PST

A new model may shed new understanding on the phenomenon known as discontinuous shear thickening (DST), in which the resistance to stirring takes a sudden jump. Easily observed in a 'kitchen experiment' by mixing together equal amounts of cornstarch and water, DST occurs because concentrated suspensions of hard particles in a liquid respond differently than normal fluids to shear forces.

Altering the community of gut bacteria promotes health and increases lifespan

Posted: 16 Jan 2014 10:06 AM PST

Having the right balance of gut bacteria may be the key to enjoying a long healthy life. Scientists promoted health and increased lifespan in Drosophila by altering the symbiotic relationship between bacteria and the absorptive cells lining the intestine. The work provides a model for studying diseases associated with the aging gut, and how we go from having a young, healthy gut to one that is old and decrepit.

Ice-loving sea anemone discovered beneath the Ross Ice Shelf

Posted: 16 Jan 2014 10:04 AM PST

Biologists have discovered new species of sea anemone while using a camera-equipped robot to explore the waters beneath 250-meter thick Ross Ice Shelf.

Massive galaxy cluster verifies predictions of cosmological theory: First detection of kinetic SZ effect in an individual galaxy cluster

Posted: 16 Jan 2014 08:35 AM PST

By observing a high-speed component of a massive galaxy cluster, scientists have detected for the first time in an individual object the kinetic Sunyaev-Zel'dovich effect, a change in the cosmic microwave background caused by its interaction with massive moving objects.

Megafloods: What they leave behind

Posted: 16 Jan 2014 08:35 AM PST

South-central Idaho and the surface of Mars have an interesting geological feature in common: amphitheater-headed canyons. Researchers offer a plausible account that all these canyons were created by enormous floods.

Astronomers probe the primitive nature of a distant 'space blob'

Posted: 16 Jan 2014 08:35 AM PST

Himiko, a "space blob" named after a legendary queen from ancient Japan, is a simply enormous galaxy, with a hot glowing gaseous halo extending over 55,000 light-years. Not only is Himiko very large, it is extraordinarily distant, seen at a time approximately 800 million years after the Big Bang, when the universe was only 6 percent of its present size and stars and galaxies were just beginning to form.

Increased mobility thanks to robotic rehab

Posted: 16 Jan 2014 08:35 AM PST

After a stroke, patients often struggle with persistent paresis. Researchers examined whether robot-assisted therapy can help stroke patients. This form of therapy proved successful particularly with the most severely affected persons with arm paresis.

Brain on autopilot

Posted: 16 Jan 2014 08:35 AM PST

The structure of the human brain is complex, reminiscent of a circuit diagram with countless connections. But what role does this architecture play in the functioning of the brain?

The way to a chimpanzee's heart is through its stomach

Posted: 16 Jan 2014 08:35 AM PST

Researchers measured the urinary oxytocin levels in wild chimpanzees after food sharing and found them to be elevated in both donor and receiver compared to social feeding events without sharing. Furthermore, oxytocin levels were higher after food sharing than after grooming, another cooperative behavior, suggesting that food sharing might play a more important role in promoting social bonding.

Researchers 'detune' a molecule: Scientists control the bonds between atoms in a buckyball

Posted: 16 Jan 2014 08:33 AM PST

Scientists have found they can control the bonds between atoms in a molecule. The molecule in question is carbon-60, also known as the buckminsterfullerene and the buckyball, discovered in 1985.

Silver nanowire sensors hold promise for prosthetics, robotics

Posted: 16 Jan 2014 08:33 AM PST

Researchers have used silver nanowires to develop wearable, multifunctional sensors that could be used in biomedical, military or athletic applications, including new prosthetics, robotic systems and flexible touch panels. The sensors can measure strain, pressure, human touch and bioelectronic signals such as electrocardiograms.

Novel technology reveals aerodynamics of migrating birds flying in a V-formation

Posted: 16 Jan 2014 08:29 AM PST

Researchers using custom-built GPS and accelerometer loggers attached to free-flying birds on migration, have gained ground-breaking insights into the mysteries of bird flight formation. 

Human arm sensors make robot smarter

Posted: 16 Jan 2014 08:27 AM PST

Using arm sensors that can "read" a person's muscle movements, researchers have created a control system that makes robots more intelligent. The sensors send information to the robot, allowing it to anticipate a human's movements and correct its own. The system is intended to improve time, safety and efficiency in manufacturing plants.

Potential treatment for drug-resistant H7N9 influenza virus

Posted: 16 Jan 2014 08:27 AM PST

A research project is showing promise in fighting the deadly novel avian H7N9 influenza virus.

Smart object recognition algorithm doesn't need humans

Posted: 16 Jan 2014 06:11 AM PST

If we've learned anything from post-apocalyptic movies it's that computers eventually become self-aware and try to eliminate humans. One engineer isn't interested in that development, but he has managed to eliminate the need for humans in the field of object recognition by creating an algorithm that can accurately identify objects in images or video sequences without human calibration.

Image perception in the blink of an eye

Posted: 16 Jan 2014 06:11 AM PST

Imagine seeing a dozen pictures flash by in a fraction of a second. You might think it would be impossible to identify any images you see for such a short time. However, a team of neuroscientists has found that the human brain can process entire images that the eye sees for as little as 13 milliseconds -- the first evidence of such rapid processing speed.

5,900 natural gas leaks discovered under Washington, D.C.: A dozen locations had concentrations high enough to trigger explosion

Posted: 16 Jan 2014 06:11 AM PST

More than 5,893 leaks from aging natural gas pipelines have been found under the streets of Washington, D.C. A dozen of the leaks could have posed explosion risks, the researchers said. Some manholes had methane concentrations as high as 500,000 parts per million of natural gas -- about 10 times greater than the threshold at which explosions can occur.

First black hole orbiting a 'spinning' star

Posted: 16 Jan 2014 06:11 AM PST

Scientists have discovered the first binary system ever known to consist of a black hole and a 'spinning' star – or more accurately, a Be-type star. Although predicted by theory, none had previously been found.

Discovery of quantum vibrations in 'microtubules' inside brain neurons supports controversial theory of consciousness

Posted: 16 Jan 2014 05:51 AM PST

A review and update of a controversial 20-year-old theory of consciousness claims that consciousness derives from deeper level, finer scale activities inside brain neurons. The recent discovery of quantum vibrations in "microtubules" inside brain neurons corroborates this theory, according to review authors. They suggest that EEG rhythms (brain waves) also derive from deeper level microtubule vibrations, and that from a practical standpoint, treating brain microtubule vibrations could benefit a host of mental, neurological, and cognitive conditions.

Hubble and Galaxy Zoo find bars and baby galaxies don't mix

Posted: 16 Jan 2014 05:51 AM PST

Harnessing the power of both the Hubble Space Telescope and the citizen science project Galaxy Zoo, scientists have found that bar-shaped features in spiral galaxies accelerate the galaxy aging process. The astronomers found that the fraction of spiral galaxies with bar features has doubled in the last eight billion years -- the latter half of the history of the universe.

Stem cells overcome damage in other cells by exporting mitochondria

Posted: 16 Jan 2014 05:50 AM PST

A research team has identified a protein that increases the transfer of mitochondria from mesenchymal stem cells to lung cells. The researchers reveal that the delivery of mitochondria to human lung cells can rejuvenate damaged cells. The migration of mitochondria from stem cells to epithelial cells also helps to repair tissue damage and inflammation linked to asthma-like symptoms in mice.

Meltwater from Tibetan glaciers floods pastures

Posted: 16 Jan 2014 05:50 AM PST

Glaciers are important indicators of climate change. Global warming causes mountain glaciers to melt, which, apart from the shrinking of the Greenlandic and Antarctic ice sheets, is regarded as one of the main causes of the present global sea-level rise. Tibet's glaciers are also losing mass clearly, as scientists reveal using satellite-based laser measurements. Over the last decade, the research team has detected a "clear loss in mass of around 16 gigatons a year in around 80 percent of the Tibetan glaciers," says a glaciologist.

Two-proton bit controlled by a single copper atom

Posted: 16 Jan 2014 05:50 AM PST

Just a single foreign atom located in the vicinity of a molecule can change spatial arrangement of its atoms. In a spectacular experiment, an international team of researchers was able to change persistently positions of the nuclei of hydrogen atoms in a porphycene molecule by approaching a single copper atom to the molecule.

Typhoid fever: A race against time

Posted: 16 Jan 2014 05:50 AM PST

The life-threatening disease typhoid fever results from the ongoing battle between the bacterial pathogen Salmonella and the immune cells of the body. A research group has now uncovered how the typhoid pathogen repeatedly manages to evade the host's immune system.

Does taking multiple medicines increase risk of being admitted to hospital? Yes and no

Posted: 16 Jan 2014 05:50 AM PST

Patients with a single illness who take many drugs have an increased risk of being admitted to hospital, but for patients with multiple conditions, taking many medicines is now associated with a near-normal risk of admission. Doctors call the situation where people take many drugs 'polypharmacy', a state of affairs that is becoming increasingly common in part because we have more elderly people and also a rising number of people are being diagnosed with multiple health conditions.

Spirituality, religion may protect against major depression by thickening brain cortex

Posted: 16 Jan 2014 05:48 AM PST

A thickening of parts of the brain cortex associated with regular meditation or other spiritual or religious practice could be the reason those activities guard against depression – particularly in people who are predisposed to the disease, according to new research. Researchers studied 130 subjects and found that those who highly valued spirituality showed thicker portions of brain cortices that may protect against depression -- especially in those at high risk for the disease.

Brain regions 'tune' activity to enable attention

Posted: 16 Jan 2014 05:48 AM PST

The brain appears to synchronize the activity of different brain regions to make it possible for a person to pay attention or concentrate on a task, scientists have learned.

Drinking and driving: Unsafe at any level, study concludes

Posted: 16 Jan 2014 05:48 AM PST

A study finds that even "minimally buzzed" drivers -- with a blood alcohol content (BAC) of 0.01 percent -- are 46 percent more likely to be officially and solely blamed by accident investigators than are the sober drivers they collide with.

Symphony of life, revealed: New imaging technique captures vibrations of proteins, tiny motions critical to human life

Posted: 16 Jan 2014 05:48 AM PST

Like the strings on a violin or the pipes of an organ, the proteins in the human body vibrate in different patterns, scientists have long suspected. Now, a new study provides what researchers say is the first conclusive evidence that this is true.

Eelectronic health record use improves shingles vaccination rate among baby boomers

Posted: 16 Jan 2014 05:48 AM PST

Shingles, a painful blistering virus related to the chicken pox, are more common in the winter and spring than any other time of the year. While people over the age of 60 account for 50% of all shingles cases, less than 15% get a vaccine that can prevent the illness. Now, a new study is showing that simple hi- and low-tech interventions may help motivate seniors to get vaccinated. The study also suggests that the combined use of pharmacists and electronic medical records could be successfully reapplied to managing other preventable or chronic illnesses.

UK rates of gout soaring, but treatment remains poor

Posted: 15 Jan 2014 04:32 PM PST

UK rates of gout have soared since the late 1990s, with one in every 40 people now affected by the condition -- the highest in Europe -- but treatment remains as poor now as it was then, reveals research published.

Food processors beware: Salmonella biofilms incredibly resistant to powerful disinfectants

Posted: 15 Jan 2014 02:29 PM PST

Once Salmonella bacteria get into a food processing facility and have an opportunity to form a biofilm on surfaces, it is likely to be extraordinarily difficult, if not impossible, to kill it, according to research published.

Using progesterone for hot flashes shown safe for women's cardiovascular health

Posted: 15 Jan 2014 02:28 PM PST

Treatment with progesterone, a naturally occurring hormone that has been shown to alleviate severe hot flashes and night sweats in post-menopausal women, poses little or no cardiovascular risk, according to a new study.

Head injuries triple long-term risk of early death

Posted: 15 Jan 2014 02:28 PM PST

Survivors of traumatic brain injuries (TBI) are three times more likely to die prematurely than the general population, often from suicide or fatal injuries, finds a study. A TBI is a blow to the head that leads to a skull fracture, internal bleeding, loss of consciousness for longer than an hour or a combination of these symptoms.

Living in densely populated neighborhoods can actually decrease risk of diabetes, obesity

Posted: 15 Jan 2014 02:28 PM PST

Torontonians living in neighborhoods that aren't conducive to walking have a 33 percent greater risk of developing diabetes or being obese, according to new research.

Breakthrough announced in treatment of patient with rare type of leukaemia

Posted: 15 Jan 2014 02:27 PM PST

A team of scientists has demonstrated a novel treatment for Hairy Cell Leukaemia (HCL), a rare type of blood cancer, using a drug administered to combat skin cancer.

New avenues for influenza control suggested by identification of an enzyme that plays a crucial role in resistance to the infection

Posted: 15 Jan 2014 02:26 PM PST

Researchers have identified an enzyme, cIAP2 that helps the lungs protect themselves from the flu by giving them the ability to resist tissue damage.

Most practice guideline recommendations based on less-than-ideal quality of evidence

Posted: 15 Jan 2014 02:26 PM PST

A study published shows that most clinical practice guidelines for interventional procedures (e.g., bronchoscopy, angioplasty) are based on lower-quality medical evidence and fail to disclose authors' conflicts of interest.

Minimally invasive surgery rates triple in U.S. for pancreatic disease

Posted: 15 Jan 2014 02:26 PM PST

Researchers report a three-fold increase in the use of minimally invasive surgery (MIS) across the nation for patients with pancreatic disease. Although adaptation of MIS for this difficult-to-reach gland is recent, the growing trend points to improved patient outcomes, such as reduced bleeding and infections.

Hugging hemes help electrons hop

Posted: 15 Jan 2014 02:26 PM PST

Researchers simulating how certain bacteria run electrical current through tiny molecular wires have discovered a secret nature uses for electron travel. This is the first time scientists have seen this evolutionary design principle for electron transport,

Heavy drinking in middle age may speed memory loss by up to six years in men

Posted: 15 Jan 2014 02:22 PM PST

Middle-aged men who drink more than 36 grams of alcohol, or two and a half US drinks per day, may speed their memory loss by up to six years later on, according to a study published. On the other hand, the study found no differences in memory and executive function in men who do not drink, former drinkers and light or moderate drinkers. Executive function deals with attention and reasoning skills in achieving a goal.

Theory behind popular blood-type diet debunked

Posted: 15 Jan 2014 02:22 PM PST

Researchers have found that the theory behind the popular blood type diet -- which claims an individual's nutritional needs vary by blood type -- is not valid.

DNA detectives able to 'count' thousands of fish using as little as a glass of water

Posted: 15 Jan 2014 02:22 PM PST

A mere glass full of water from Monterey Bay Aquarium's 1.2 million-gallon Open Sea tank, among the 10 largest aquariums in the world, is all scientists really needed to identify the Pacific Bluefin tuna, dolphinfish and most of the other 13,000 fish swimming there.

New drug combo cures toughest cases of hepatitis C, hints to future injection-free therapies

Posted: 15 Jan 2014 02:22 PM PST

Efforts to cure hepatitis C, the liver-damaging infectious disease that has for years killed more Americans than HIV/AIDS, are about to get simpler and more effective, according to new research.

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