Bad Memories? Here, Take a Pill

Posted June 3rd, 2011 at 6:29 pm (UTC-4)
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Do you ever wish you could take a pill that would erase a really traumatic memory or at least help take the emotional pain away?

A recent study suggests researchers might be on to something like that.

The team from the Centre for Studies on Human Stress at the University of Montreal says the drug metyrapone could help those suffering from conditions such as Post-traumatic stress disorder.

On the “Science World” radio program this weekend, we talk with the study’s lead author, Marie-France Marin.

She tells us that metyrapone doesn’t actually eliminate the memory, but it does reduce the brain’s ability to re-record the negative emotions associated with bad memories.

Listen to the interview here… 

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Other stories we cover on the “Science World” radio program this week include:

  • A somber anniversary as AIDS hits the 30-year mark
  • World health experts now say cell phones might cause cancer
  • China rejects Google claims that hackers in that country spied on email accounts
  • How technology is helping to improve access to health care in Senegal
  • Who would win a chess match in an Earth versus Space contest
Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Science Scanner: As One Mission Ends, NASA Readies Its Last

Posted June 2nd, 2011 at 4:51 pm (UTC-4)
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One down, one more to go…

This past Wednesday was a rather busy day at NASA’s Kennedy Space Center in Florida.

The Space Shuttle Endeavour and her six-member crew flew home for the last time, landing at 2:34 a.m. EDT.

Endeavour’s final mission, STS-134, lasted 16 days and covered more than 10,460,736 kilometers (6.5 million miles).

The mission’s accomplishments included the delivery and installation of an Alpha Magnetic Spectrometer, a cosmic ray detector, at the International Space Station.

The youngest of the space shuttle fleet, Endeavour first launched in 1992. Throughout its nearly 20-year career, she flew 25 missions, spent 299 days in space, orbited Earth 4,671 times and traveled 197,761,262 kilometers (122,883,151 miles).

Now that it’s Earth-bound for good, Endeavour will be fully retired, cleaned and shipped to the California Science Center in Los Angeles where it will be readied for display, hopefully by next spring.

Meanwhile, Atlantis is being readied for what will be the final overall flight of the space shuttle program. That launch is scheduled at the Florida space center on July 8.

Atlantis arrived at launch pad 39A early Wednesday morning and was secured there at 3:29 a.m. The space shuttle was delivered to the launch pad on top of a giant crawler-transporter.

The huge machine left the Kennedy Space Center’s Vehicle Assembly Building the night before, at 8:42 p.m. EDT.  Traveling at less 1.61 kilometers per hour (1 mph), the transporter made the nearly 5.5-kilometer (3.4 miles) journey to the launch pad in approximately seven hours.

>>> Read more…

 

Your face looks familiar but I just can’t place you

Did you know that every time you see a person that you know, your brain processes a series of instructions that rapidly and – with what seems to be very little effort – recognizes that person by his or her face.

Researchers at Pittsburgh’s Carnegie Mellon University say  they’ve uncovered just how the brain processes faces by identifying the neural system responsible for face recognition

The Carnegie Mellon team discovered that an entire network of cortical areas (outer areas of the brain) works together to identify faces.

A study based on the team’s research is published in the current issue of the Proceedings of the National Academy of Sciences (PNAS).

The scientists involved in this discovery hope the findings will change the future of neural visual perception research and that others will use the findings to develop targeted remedies for disorders such as face blindness.

>>> Read more…

 

Did the Vikings in Greenland say, ‘It’s too cold, let’s get out of here’?

Severe weather might have helped doom the Vikings, according to new research.

Scientists have long wondered what became of the western settlements of the Vikings on Greenland and how they met their demise in the 14th and 15th centuries. While archaeological evidence might provide some insight, the lack of written evidence suggests the full story of how the Norse colony met its end will probably remain a mystery.

Climatologists have said that an extended severe cold snap, called the “Little Ice Age” gripped Greenland in the 1400s. This “Little Ice Age” has often been cited as a major cause of the disappearance of the Norse people.

Now research, developed by scientists from Brown University in Providence, Rhode Island,  shows that the climate turned colder earlier, perhaps several decades earlier than previously thought, setting off what could have been the beginning of the end of the Greenland Norse.

However, researchers say the severe climate isn’t the only reason for the demise of the Norse Western Settlement.

The Vikings’ sedentary lifestyle, their reliance on agriculture and livestock for food, dependence on trade with Scandinavia and combative relations with the neighboring Inuit (indigenous people of the Arctic region) are also believed to be contributing factors.

The findings of this study were published in the Proceedings of the National Academy of Sciences.

>>> Read more…

 

Getting to the root of childhood obesity

What’s behind childhood obesity? Can it be more than what the kids are eating?

According to the World Health Organization, childhood obesity is one of the most serious public health challenges of the 21st century. The global problem is steadily affecting many low- and middle-income countries, particularly in urban settings. The WHO also says the prevalence of childhood obesity has increased at an alarming rate.

A group of scientists from the University of Illinois at Urbana-Champlain, representing a variety of disciplines, is teaming up to examine the factors that contribute to childhood obesity.

The team is taking a multidisciplinary approach because individual researchers have found that the problem is too complicated for any one of them to tackle alone.

The scientists are looking at a variety of factors such as genetic predisposition, the effect of breastfeeding, how much TV a child watches and even where the child lives.

The research will examine the problem of childhood obesity from the following angles: cell, child, clan (or family), community, country and culture. The research team published its paper detailing this unique approach in a recent issue of Child Development Perspectives.

>>> Read more…

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Water on the Moon

Posted May 31st, 2011 at 5:58 pm (UTC-4)
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Looking up at the Moon from our blue planet Earth, it’s hard to see anything other than a barren landscape.  Devoid of any life, it’s a visual study in dusty shades of gray.

But recently scientists from Case Western Reserve University, the Carnegie Institution for Science, and Brown University have found that parts of the Moon’s interior contains as much water as the upper mantle of the Earth, more than 100 times what was measured before.

Examining moon material brought back to earth back in 1972 by the US Apollo 17 mission, the researchers were able to find water along with other volatile elements such as fluorine, chlorine and sulfur.

One of the scientists involved with this discovery is James Van Orman, a professor of geological studies at Case Western Reserve in Cleveland, Ohio.  “These samples provide the best window we have to the amount of water in the interior of the Moon,” says Van Orman.  “The interior seems to be pretty similar to the interior of the Earth, from what we know about water abundance.”

This discovery seems to strengthen the theory that the Moon and Earth have a common origin but at the same time may force scientists to reconsider the current theory of the process: that a huge impact in Earth’s early history ejected material into orbit that became the Moon.

Published in the May 26 edition of Science Express, this finding is said to challenge previously made assumptions on how the Moon came to be and provides new clues into the process of lunar formation.

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Happiness, a bad thing?

Posted May 27th, 2011 at 3:55 pm (UTC-4)
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Who doesn’t want to be happy?

For many, finding happiness is a treasured lifelong goal.  The “pursuit of happiness”  is a fundamental human right, at least according to the US Declaration of Independence alongside Liberty and Life itself.   And really – who couldn’t stand a little more happiness in their lives?

But according the authors of a new review article published in Perspectives on Psychological Science, happiness can have a dark side.

In their study, June Gruber of Yale University’s Department of Psychology and Director of Yale’s “Positive Emotion & Psychopathology Laboratory”, with her co-authors, Iris Mauss of the University of Denver and Maya Tamir of the Hebrew University of Jerusalem say that happiness shouldn’t be thought of as a universally good thing.

Not all types and degrees of happiness are equally good, they say, claiming that the act of pursuing happiness can actually make people feel worse.

Listen to the interview here…

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Other stories we’ll cover on the Science World radio program this week include:

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Science Scanner: NASA Readies for Human Deep Space Exploration

Posted May 25th, 2011 at 7:43 pm (UTC-4)
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NASA Spacecraft to Take Humans into Deep Space

NASA has revealed the new US spacecraft which will take humans into deep space.

The vehicle will carry four astronauts for 21-day missions and be able to land in the Pacific Ocean off the California coast. It is designed to be 10 times safer during ascent and entry than its predecessor, the space shuttle.

The new system will be based on designs originally planned for the Orion Crew Exploration Vehicle and will be used to develop a new spacecraft known as the Multi-Purpose Crew Vehicle (MPCV).

“We are committed to human exploration beyond low-Earth orbit and look forward to developing the next generation of systems to take us there,” said NASA Administrator Charles Bolden.  “The NASA Authorization Act lays out a clear path forward for us by handing off transportation to the International Space Station to our private sector partners, so we can focus on deep space exploration”, said Bolden.

Lockheed Martin Corporation, an American aerospace company, will continue working to develop the MPCV.  The spacecraft will have a pressurized volume of 690 cubic feet, with 316 cubic feet of habitable space.

>>> Read more…

Genetic Study Reveals Shared Ancestry

A new study by Harvard researchers finds a distinct presence of African ancestry in Southern European, Middle Eastern and Jewish populations.

The finding sheds new light on the intermingling and migration of European, Middle Eastern and African and populations since ancient times.

David Reich, an Associate Professor of Genetics at the Harvard Medical School and his colleagues investigated the proportion of sub-Saharan African ancestry present in various populations in West Eurasia – defined as the geographic area spanning modern Europe and the Middle East.

While previous studies have established that such shared ancestry exists, they have not indicated to what degree or how far back the mixing of populations can be traced.

The researchers detected no African genetic signatures in Northern European populations.

>>> Read more…

Could Global Warming Limit Trees Ability to Store Carbon?

One of the most positive steps that anyone concerned about global warming can do is to plant trees and preserve forests.

Trees and plants capture carbon dioxide during photosynthesis, thereby removing the most abundant greenhouse gas from the atmosphere and storing some of it in their woody tissue.

Yet global warming may affect the capacity of trees to store carbon by altering forest nitrogen cycling. That’s the conclusion of a 7-year study led by Jerry Melillo of the Marine Biological Laboratory, which was published this week in Proceedings of the National Academy of Sciences.

For the first time in a field experiment, the study showed that warmer temperatures stimulate the gain of carbon stored in trees as woody tissue, partially offsetting the soil carbon loss to the atmosphere.

The carbon gains in trees, the scientists found, is due to more nitrogen being made available to the trees with warmer soil.

>>> Read more…

Recently Discovered Massive Star Rivals the Sun

An international team of astronomers has discovered a massive star with a mass that is 150 times greater than the sun.

It was detected during a major study of the Tarantula Nebula, located in the Large Magellanic Cloud. The star, called VFTS 682, is one of the more massive stars (up to 300 times the mass of the Sun) ever known.

It was first observed a few years ago but was initially found not to be very massive. The team has now shown that a large part of its light is absorbed and scattered by dust on its way to the Earth and that the star is actually much brighter than first thought.

But the major surprise is that the star lies on its own and is not a member of a dense star cluster.

Up to now, astronomers have believed that very massive stars could only exist at the center of very dense star clusters.

>>> Read more…

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Improved Sense of Smell Led to Bigger Brains

Posted May 23rd, 2011 at 6:58 pm (UTC-4)
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We all enjoy the aroma of beautiful flowers or of those freshly baked cookies. Our acute sense of smell is something that is unique to mammals. And, according to a recent discovery, it also boosted brain evolution.

The study, published in the journal Science, may help explain why mammals evolved such large and complex brains, which in some cases grew to 10 times larger than relative body size.

The researchers reconstructed and examined the fossils of Morganuocodon and Hadrocodium, which are described as tiny, shrew-like creatures from the early Jurassic Period.

They were able to find new proof that the mammalian brain evolved in three major stages:  improvements in the sense of smell,  increasing touch or tactile sensitivity from body hair and  improved neuromuscular coordination, the ability to produce skilled muscle movement using the senses.

Scientists now plan to delve further into the diversification of the brain and sensory systems as mammals evolved and diversified.

“This will unlock new secrets about how huge brains and extreme sensory adaptations evolved in mammals, such as electroreception in the platypus and sonar in whales and bats. It is all very exciting,” said lead author Tim Rowe, director of the Vertebrate Paleontology Laboratory at the University of Texas at Austin.

Click here to read more on this study.

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Bubbling Volcanic Ocean Found Beneath Jupiter Moon

Posted May 20th, 2011 at 1:32 pm (UTC-4)
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Scientists have discovered an enormous ocean of bubbling magma beneath the surface of Io, one of the many moons of Jupiter.

A team of researchers studying this phenomenon says that the global ocean about 30 to 50 kilometers beneath Io’s crust helps explain the moon’s activity.

While volcanoes on Earth tend to occur in localized spots like the “Ring of Fire” around the Pacific Ocean, the volcanoes on Io are found all over its surface, producing about 100 times more lava each year than all the volcanoes on Earth.

On the Science World radio program this weekend, Dr. Krishan Khurana, from UCLA’s Institute of Geophysics & Planetary Physics, tells us why Io is considered to be the most volcanically active body in our solar system.

Listen to the interview here:

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Watch related video (Courtesy of: NASA/JPL/University of Michigan/UCLA):

Other stories we’ll cover on the Science World radio program include:

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Science Scanner: Exploding Watermelons and Silk-Shooting Tarantulas

Posted May 17th, 2011 at 8:09 pm (UTC-4)
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Fruit Land Mines

Watermelons are exploding all over Eastern China. It sounds like the storyline from a movie but, unfortunately, its true. And it’s causing havoc for farmers who had hoped to quickly grow bigger melons.

An investigative report by China Central Television finds farms in Jiangsu Province are losing acres of fruit to the problem. Anxious for a more bountiful harvest, the farmers reportedly sprayed too much growth chemical on the crops during wet weather.

So, instead of an abundance of melons, the farmers are coping with fields of fruit land mines.

>>> Read more…

Stopping HIV Transmission with a Molecular Barrier

Boston researchers have developed a topically-applied molecular microbicide, an agent that kills microbes, which is capable of preventing the transmission of HIV.

The microbicide works by silencing the genes that promote infection. The researchers continue to test the medication on mice and are optimistic about its long-term effects. The findings could lead to the development of a similar solution to protect women against HIV infection, potentially for weeks at a time, boosting the global efforts to halt the spread of HIV/AIDS.

The study, led by Lee Adam Wheeler and Judy Lieberman of the Immune Disease Institute and the Program in Cellular and Molecular Medicine at Children’s Hospital Boston, was published online in the Journal of Clinical Investigation.

>>> Read more

Keep Hackers and Crackers Away with a Good Beat

Computer scientists in Beirut are working on technology that would render stolen passwords useless.

Keeping your computer and confidential information secure is increasingly difficult. No matter how sophisticated and guarded, passwords aren’t  100 percent secure. Hackers, crackers and others who want to snoop or steal valuable data can always find ways to gain access to a password and, subsequently, to your information.

The Beirut computer scientists are approaching the verification of passwords in a  unique way. They take the speed with which a user types in their login into account. With this technique, the gaps between the entry of characters by someone unfamiliar with the password would render a stolen password useless.

>>> Read more

Ancient Egyptian Princess had Coronary Artery Disease

Researchers using whole body computerized tomography scanning techniques on mummified remains have determined that an Egyptian princess who lived between 1580 and 1550 BC is the first person in human history  to be diagnosed coronary artery disease.

Unlike many patients with coronary artery disease today, Princess Ahmose-Meryet-Amon, who lived in Thebes (Luxor), didn’t eat a poor diet loaded with red meats and fatty foods. She didn’t live a sedentary lifestyle, either. Plus, tobacco and trans-fats were unknown during her time.

In fact, researchers believe she lived an active life and ate a diet rich in vegetables, fruit and a limited amount of meat from domesticated (but not fattened) animals. The princess also ate bread and drank beer – two of ancient Egypt’s dietary staples of this period – made from wheat and barley, which were grown along the banks of the Nile.

>>> Read more

Tarantulas Shoot Silk from their Feet

Back in 2006, research scientists in Germany published a paper that suggested tarantulas save themselves from falling by releasing silk threads from their feet.

The findings of Dr. Stanislav Gorb and his colleagues at the Max Planck Institute appeared in Nature. However, they were soon disputed by other researchers who said that they couldn’t find any proof of the tarantula’s silk.

Fast forward five years. Dr. Claire Rind from the University of Newcastle, UK, intrigued by spiders and the scientific controversy, decided to continue the investigation. She discovered that tarantulas do indeed shoot silk from their feet when they lose their footing.

Rind published the results of her research in The Journal of Experimental Biology.

>>> Read More

 

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Fat “Master Switch” Gene Found

Posted May 16th, 2011 at 7:36 pm (UTC-4)
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Scientists may have discovered the so-called “master switch” gene that’s linked to obesity, type 2 diabetes and cholesterol levels. Researchers believe the gene, known as KLF14,  controls the behavior of other genes found in body fat.

Although genetic researchers have known about KLF14’s connection to  diabetes and cholesterol levels for some time, this study shows how the gene acts like a regulator in controlling other genes located in the body’s fat cells.

Professor Mark McCarthy, of the University of Oxford, co-authored the study. “KLF14 seems to act as a master switch controlling processes that connect changes in the behavior of subcutaneous fat to disturbances in muscle and liver that contribute to diabetes and other conditions.”

Subcutaneous fat is the fat located just below the skin.

The other genes found to be controlled by KLF14 have been connected to a wide series of metabolic traits including obesity, cholesterol, insulin and glucose levels. Researchers say the finding illustrates just how connected these traits are to one another.

Since fat is a central factor in conditions like obesity, heart disease and diabetes, scientists hope finding this central regulatory gene will one day lead to new treatments to fight these diseases.

And, although we all inherit a set of genes from both of our parents, the activity of this “master switch” gene,  is said to be inherited from the mother. In a process called imprinting, researchers found that the copy of KLF14 from the father is switched off while the copy from the mother remains active.

The study was published recently in the  in scientific journal, Nature Genetics and was one part of a large multi-national collaboration known as the MuTHER study.

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.

Are Brain Waves as Unique as Fingerprints?

Posted May 13th, 2011 at 4:54 pm (UTC-4)
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When children enter adolescence their brains begin to undergo a series of rapid changes – actually a sort of neural overhaul – shedding what was needed in childhood and adding functions and abilities that are critical in adulthood.

Despite these considerable and ongoing changes, when something in the brain remains so steadily unaltered, neuroscientists take notice.

In a study co-authored by Dr. Mary Carskadon, professor of psychiatry at the Warren Alpert Medical School of Brown University and director of the Sleep Research Laboratory at E.P. Bradley Hospital, researchers have found that most of their teenage study subjects maintained a unique and consistent pattern of underlying brain oscillations.

This observation appears to support an idea, already observed in adults, that people produce a kind of unique brain wave “fingerprint.”

On the Science World radio program this weekend, Professor Carskadon talks more about the study and how these “fingerprints” could someday lead to a method to predict and possibly treat those who may go on to develop mental illnesses such as schizophrenia or depression. Listen to a preview of the interview here:

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Other stories we’ll cover on the Science World radio program include:

Rick Pantaleo
Rick Pantaleo maintains the Science World blog and writes stories for VOA’s web and radio on a variety of science, technology and health topics. He also occasionally appears on various VOA programs to talk about the latest scientific news. Rick joined VOA in 1992 after a 20 year career in commercial broadcasting.