الأربعاء، 18 أبريل 2012

ScienceDaily: Latest Science News

ScienceDaily: Latest Science News


Brain scans can predict weight gain and sexual activity, research shows

Posted: 17 Apr 2012 07:19 PM PDT

At a time when obesity has become epidemic in American society, scientists have found that functional magnetic resonance imaging (fMRI) brain scans may be able to predict weight gain. In a new study, the researchers demonstrated a connection between fMRI brain responses to appetite-driven cues and future behavior.

Long-term exposure to air pollution increases risk of hospitalization for lung, heart disease

Posted: 17 Apr 2012 07:18 PM PDT

Older adults may be at increased risk of being hospitalized for lung and heart disease, stroke, and diabetes following long-term exposure to fine-particle air pollution, according to a new study. It is the first study to look at the link between long-term effects of exposure to fine particles in the air and rates of hospital admissions.

Scientists discover 'switch' in plants to create flowers

Posted: 17 Apr 2012 07:18 PM PDT

Flowering is the most crucial act that plants undergo, as the fruits of such labor include crops on which the world depends, and seeds from which the next generation grows. While classic experiments have demonstrated that plants are able to adjust the timing of their flowering in response to environmental conditions, such as light and temperature, until now very little was known about what exactly triggers plants to make flowers instead of leaves. Now, a team of researchers from Singapore has discovered how this happens.

Egg-laying beginning of the end for dinosaurs

Posted: 17 Apr 2012 07:17 PM PDT

Their reproductive strategy spelled the beginning of the end: The fact that dinosaurs laid eggs put them at a considerable disadvantage compared to viviparous mammals. Researchers believe they now know why and how this ultimately led to the extinction of the dinosaurs.

Electronic cigarettes may help smokers' memory while they kick the habit

Posted: 17 Apr 2012 07:17 PM PDT

Electronic cigarettes - battery-operated devices that provide nicotine via inhaled vapor - may help the memory as well as ease cravings as smokers quit their habit, new research suggests.

Listening to your favorite music boosts performance

Posted: 17 Apr 2012 07:17 PM PDT

Whether you like classical, death metal or skiffle, listening to your own choice of music could improve your enjoyment of taking part in competitive sports and improve performance, a study has found.

Bring water into exams to improve your grade

Posted: 17 Apr 2012 07:16 PM PDT

Students who bring water into exams may improve their grade by keeping hydrated, new research suggests.

It doesn’t mean you’re crazy –- talking to yourself has cognitive benefits, study finds

Posted: 17 Apr 2012 07:16 PM PDT

Most people talk to themselves at least every few days, and many report talking to themselves on an hourly basis. What purpose is served by this seemingly irrational behavior? Previous research has suggested that such self-directed speech in children can help guide their behavior. For example, children often talk themselves step-by-step through tying their shoelaces, as if reminding themselves to focus on the job in hand. Can talking to oneself also help adults?

Violence in men caused by unequal wealth and competition, study suggests

Posted: 17 Apr 2012 07:16 PM PDT

Violence in men can be explained by traditional theories of sexual selection. A new review points to a range of evidence that suggests that high rates of physical aggression and assaults in men are rooted in inter-male competition.

Positive feelings may help protect cardiovascular health

Posted: 17 Apr 2012 01:30 PM PDT

Over the last few decades numerous studies have shown negative states, such as depression, anger, anxiety, and hostility, to be detrimental to cardiovascular health. Less is known about how positive psychological characteristics are related to heart health. In the first and largest systematic review on this topic to date, researchers found that positive psychological well-being appears to reduce the risk of heart attacks, strokes and other cardiovascular events.

Lead dust is linked to violence, study suggests

Posted: 17 Apr 2012 01:27 PM PDT

Childhood exposure to lead dust has been linked to lasting physical and behavioral effects, and now lead dust from vehicles using leaded gasoline has been linked to instances of aggravated assault two decades after exposure, according to researchers.

Scientists tailor cell surface targeting system to hit organelle ZIP codes

Posted: 17 Apr 2012 12:27 PM PDT

Scientists who developed a technology for identifying and targeting unique protein receptor ZIP codes on the cellular surface have found a way to penetrate the outer membrane and deliver engineered particles -- called iPhage -- to organelles inside the cell.

Saliva test could dramatically increase detection of oral cancer

Posted: 17 Apr 2012 12:27 PM PDT

Scientists are working to create a simple, cost-effective saliva test to detect oral cancer, a breakthrough that would drastically improve screening and result in fewer people dying of the world's sixth most common cancer.

New process improves catalytic rate of enzymes by 3,000 percent

Posted: 17 Apr 2012 12:27 PM PDT

Light of specific wavelengths can be used to boost an enzyme's function by as much as 30 fold, potentially establishing a path to less expensive biofuels, detergents and a host of other products.

The BP oil spill, two years later: Natural recovery far greater than expected

Posted: 17 Apr 2012 12:26 PM PDT

This Friday, April 20, will mark two years since the explosion aboard the Deepwater Horizon oil rig caused vast quantities of crude oil to flow into the Gulf of Mexico. But despite the size of the spill, "the natural recovery is far greater than what anybody hoped when it happened," said a professor of biology. "The fears of most people – that there would be a catastrophic collapse of the ecosystem in the Gulf – never materialized."

Nanocrystal-coated fibers might reduce wasted energy

Posted: 17 Apr 2012 11:38 AM PDT

Researchers are developing a technique that uses nanotechnology to harvest energy from hot pipes or engine components to potentially recover energy wasted in factories, power plants and cars.

Parkinson's protein causes disease spread in animal model

Posted: 17 Apr 2012 11:38 AM PDT

Researchers have shown that brain tissue from a Parkinson's disease mouse model, as well as synthetically produced disease protein fibrils, injected into young, symptom-free PD mice led to spreading of PD pathology.

A toxic menu: Marine worm feeds on carbon monoxide and hydrogen sulphide with the help of symbiotic bacteria

Posted: 17 Apr 2012 11:38 AM PDT

Scientists have revealed that a small marine worm, faced with a scarce food supply in the sandy sediments it lives in off the coast of Elba, must deal with a highly poisonous menu: this worm lives on carbon monoxide and hydrogen sulphide.

Study of half siblings provides genetic clues to autism

Posted: 17 Apr 2012 11:38 AM PDT

New research in half siblings adds to evidence that even though autism is far more common in males, mothers and fathers appear to be transmitting genetic risk equally.

New genetically engineered mice aid understanding of incurable neuromuscular disease

Posted: 17 Apr 2012 11:38 AM PDT

Scientists have created a genetically modified mouse that mimics key features of Charcot-Marie-Tooth disease, an inherited neuromuscular disease affecting approximately 150,000 people in the United States.

Sunlight plus lime juice makes drinking water safer

Posted: 17 Apr 2012 09:56 AM PDT

Adding lime juice to water that is treated with a solar disinfection method removed detectable levels of harmful bacteria such as Escherichia coli significantly faster than solar disinfection alone.

Knee injuries in women linked to motion, nervous system differences

Posted: 17 Apr 2012 09:56 AM PDT

Women are more prone to knee injuries than men, and the findings of a new study suggest one cause may be that males and females differ in the way they transmit the nerve impulses that control muscle force. Men control nerve impulses similar to individuals trained for explosive muscle usage -- like those of a sprinter -- while the nerve impulses of women are more similar to those of an endurance-trained athlete, like a distance runner.

Nanotube electrodes improve solar cells

Posted: 17 Apr 2012 09:56 AM PDT

Forests of carbon nanotubes are an efficient alternative for platinum electrodes in dye-sensitized solar cells, according to new research.

Scarcity of college men leads women to choose briefcase over baby

Posted: 17 Apr 2012 08:37 AM PDT

American women today are more likely to earn college degrees than men with women receiving 57 percent of all bachelor's and 60 percent of all master's degrees. New research has found the ratio of men to women dramatically alters women's choices about career and family.

Some stars capture rogue planets

Posted: 17 Apr 2012 08:36 AM PDT

New research suggests that billions of stars in our galaxy have captured rogue planets that once roamed interstellar space. The nomad worlds, which were kicked out of the star systems in which they formed, occasionally find a new home with a different sun. This finding could explain the existence of some planets that orbit surprisingly far from their stars, and even the existence of a double-planet system.

Understanding of hearing in baleen whales amplified

Posted: 17 Apr 2012 08:36 AM PDT

For decades, scientists have known that dolphins and other toothed whales have specialized fats associated with their jaws, which efficiently convey sound waves from the ocean to their ears. But until now, the hearing systems of their toothless grazing cousins, baleen whales, remained a mystery, largely because specimens to study are hard to get. Now, a new study has shown that some baleen whales also have fats leading to their ears.

Cognitive biometrics: A very personal login

Posted: 17 Apr 2012 08:35 AM PDT

Retina and iris scans, fingerprint and palm logins rely on possession of unique anatomical characteristics that you cannot forget as you might a password. A new review examines alternative approaches to user authentication.

Most Wikipedia entries about companies contain factual errors, study finds

Posted: 17 Apr 2012 08:35 AM PDT

Sixty percent of Wikipedia articles about companies contain factual errors. But when public relations professionals try to correct them the rules often get in the way, experts say.

Brain cancer vaccine proves effective, study suggests

Posted: 17 Apr 2012 08:34 AM PDT

A new brain cancer vaccine tailored to individual patients by using material from their own tumors has proven effective in a multicenter phase 2 clinical trial at extending their lives by several months or longer. The patients suffered from recurrent glioblastoma multiforme —- which kills thousands of Americans every year.

Feelings of immaturity accompany alcohol misuse into adulthood

Posted: 17 Apr 2012 07:26 AM PDT

Tipping back one too many cocktails during an individual's early 20s doesn't correlate to a personal sense of immaturity; however if this habit doesn't stop as they reach age 30, young adults can feel psychologically underdeveloped, according to a new study. Helping young adults acknowledge their mental impulse to "sober up" as they mature can improve substance abuse intervention programs.

Plastic garbage in oceans: Understanding marine pollution from microplastic particles

Posted: 17 Apr 2012 07:25 AM PDT

Biologists have prepared guidelines for a more precise investigation into marine pollution from microplastic particles.

Study hints at why gums suffer with age

Posted: 17 Apr 2012 07:24 AM PDT

A study reveals that gum deterioration, which often occurs with increasing age, is associated with a drop in the level of a protein called Del-1.

Silicone breast implant failures significantly higher than previously thought

Posted: 17 Apr 2012 07:24 AM PDT

New research suggests that the failure rate of silicone breast implants manufactured by Poly Implant Prosthese (PIP) could be as high as 33.8 percent.

Panoramic view of a turbulent star-making region

Posted: 17 Apr 2012 07:20 AM PDT

Several million stars are vying for attention in a new image of a raucous stellar breeding ground in 30 Doradus, located in the heart of the Tarantula nebula.

Helicopter transport improves trauma patient survival compared to ground transport

Posted: 17 Apr 2012 07:20 AM PDT

A new study concludes a helicopter flight to a top-level trauma center boosts the chance of survival over ground transport.

Excessive weight gain during pregnancy a predictor for above-average birth weight

Posted: 17 Apr 2012 07:19 AM PDT

One out of every two women of reproductive age is overweight or obese. Overweight or obese women are more likely to give birth to above average weight babies, new research shows.

Babies flick 'anti-risk switch' in women but not men

Posted: 17 Apr 2012 07:19 AM PDT

Unlike women, men don't curb certain risk-taking behaviors when a baby is present, a new psychology study suggests.

Asteroid craters on Earth give clues in search for life on Mars

Posted: 17 Apr 2012 05:05 AM PDT

Craters made by asteroid impacts may be the best place to look for signs of life on other planets, a study suggests.

Depression may lead mothers to wake babies

Posted: 17 Apr 2012 05:05 AM PDT

Depressed mothers are more likely to needlessly wake up their infants at night than mothers who are not depressed, according to Penn State researchers.

Hot new manufacturing tool: A temperature-controlled microbe

Posted: 17 Apr 2012 05:05 AM PDT

Scientists have found a way to control a heat-loving microbe with a temperature switch: it makes a product at low temperatures but not at high temperatures. The innovation could make it easier to use microorganisms as miniature factories for the production of needed materials like biofuels.

Liquorice root found to contain anti-diabetic substance

Posted: 17 Apr 2012 05:04 AM PDT

It provides the raw material for liquorice candy, calms the stomach and alleviates diseases of the airways: liquorice root. Chosen as the "Medicinal plant 2012," the root has been treasured in traditional healing since ancient times. Researchers have now discovered that liquorice root also contains substances with an anti-diabetic effect.

Magnetic fields can send particles to infinity

Posted: 17 Apr 2012 05:03 AM PDT

Researchers have mathematically shown that particles charged in a magnetic field can escape into infinity without ever stopping. One of the conditions is that the field is generated by current loops situated on the same plane. At the moment this is a theoretical mathematical study, but researchers have recently demonstrated that, in certain conditions, magnetic fields can send particles to infinity.

Lack of sleep is linked to obesity, new evidence shows

Posted: 17 Apr 2012 05:03 AM PDT

Can lack of sleep make you fat? A new paper which reviews the evidence from sleep restriction studies reveals that inadequate sleep is linked to obesity. The research explores how lack of sleep can impact appetite regulation, impair glucose metabolism and increase blood pressure.

Orangutans smarter than previously thought: Orangutan nest building highly sophisticated

Posted: 17 Apr 2012 05:03 AM PDT

Orangutans may be smarter than previously thought if a new study into the sophisticated way they build nests is any indication.

Preschoolers' reading skills benefit from one modest change by teachers

Posted: 17 Apr 2012 05:01 AM PDT

A small change in how teachers and parents read aloud to preschoolers may provide a big boost to their reading skills later on, a new study found.

70-year-old chemical mystery solved: How tropolone are synthesized in fungi

Posted: 16 Apr 2012 12:44 PM PDT

Chemists and biologists have finally cracked one of the longest standing chemical mysteries. They have demonstrated exactly how an unusual class of compounds known as tropolones are synthesized in fungi.

Economic damage to US economy from offshoring jobs may be exaggerated

Posted: 16 Apr 2012 12:01 PM PDT

Sending jobs overseas may not be as damaging to the U.S. economy as commonly believed, according to a new study.

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