The Edge of Food
|Adrian Gombart||May 25th 2012|
Scientists have just identified a new reason why some curry dishes, made with spices humans have used for thousands of years, might be good for you. New research at Oregon State University has discovered that curcumin, a compound found in the cooking spice turmeric, can cause a modest but measurable increase in levels of a protein that's known to be important in the "innate" immune system, helping to prevent infection in humans and other animals.
This cathelicidin antimicrobial peptide, or CAMP, is part of what helps our immune system fight off various bacteria, viruses or fungi even though they hadn't been encountered before. Prior to this, it was known that CAMP levels were increased by vitamin D. Discovery of an alternative mechanism to influence or raise CAMP levels is of scientific interest and could open new research avenues in nutrition and pharmacology, scientists said. Turmeric is a flavorful, orange-yellow spice and an important ingredient in many curries, commonly found in Indian, South Asian and Middle Eastern cuisine. It has also been used for 2,500 years as a medicinal compound in the Ayurvedic system of medicine in India – not to mention being part of some religious and wedding ceremonies. In India, turmeric is treated with reverence. The newest findings were made by researchers in the Linus Pauling Institute at OSU and published today in the Journal of Nutritional Biochemistry, in collaboration with scientists from the University of Copenhagen in Denmark. Read more ..
The Medical Edge
|Jessica Guenzel||May 24th 2012|
NYU School of Medicine
Researchers at NYU School of Medicine have, for the first time, identified a single gene that simultaneously controls inflammation, accelerated aging and cancer.
"This was certainly an unexpected finding," said principal investigator Robert J. Schneider, PhD, the Albert Sabin Professor of Molecular Pathogenesis, associate director for translational research and co-director of the Breast Cancer Program at NYU Langone Medical Center. "It is rather uncommon for one gene to have two very different and very significant functions that tie together control of aging and inflammation. The two, if not regulated properly, can eventually lead to cancer development. It's an exciting scientific find."
For decades, the scientific community has known that inflammation, accelerated aging and cancer are somehow intertwined, but the connection between them has remained largely a mystery, Dr. Schneider said. What was known, due in part to past studies by Schneider and his team, was that a gene called AUF1 controls inflammation by turning off the inflammatory response to stop the onset of septic shock. But this finding, while significant, did not explain a connection to accelerated aging and cancer.
When the researchers deleted the AUF1 gene, accelerated aging occurred, so they continued to focus their research efforts on the gene. Now, more than a decade in the making, the mystery surrounding the connection between inflammation, advanced aging and cancer is finally being unraveled. Read more ..
The Edge of Medicine
|Danial Ben Tal||May 24th 2012|
Only a few years ago it would have belonged to the realm of science fiction: A tiny capsule that travels through the intestines, snapping 360-degree X-ray images and continuously transmitting information to a wrist-worn data receiver reporting on the prevalence of polyps, the precursors of colorectal cancer.
Thanks to the ingenuity of Israel’s Check-Cap, all you’ll have to do is swallow a tiny capsule containing a miniaturized X-ray source and several imaging sensors. No colonoscopy, no hospital visit. “Everyone over 50 should be regularly screened for colon cancer,” CEO Guy Neev states “yet too few people do so because the standard colonoscopy procedure is uncomfortable and invasive. Ingesting the capsule involves no preparation or discomfort, and patients can continue to go about their everyday lives — meaning that they are far more likely to take the test.” Read more ..
Edge of Medicine
|Sabine Guinsbourg||May 24th 2012|
On a special surface that could help advance stem cell therapies, researchers at the University of Michigan have turned human skin cells into adult-derived stem cells, coaxed them into bone cells and then transplanted them into holes in the skulls of mice. The cells produced four times as much new bone growth as in the mice without the extra bone cells. The researchers proved that this special surface, free of biological contaminants, allows adult-derived stem cells to thrive and transform into multiple cell types. Their success brings stem cell therapies another step closer. An embryo's cells really can be anything they want to be when they grow up: organs, nerves, skin, bone, any type of human cell. Adult-derived "induced" stem cells can do this and better. Because the source cells can come from the patient, they are perfectly compatible for medical treatments.
Paul Krebsbach, chair of biological and materials sciences at the U-M School of Dentistry, said that in order to make them, "We turn back the clock, in a way. We're taking a specialized adult cell and genetically reprogramming it, so it behaves like a more primitive cell." Specifically, human skin cells are turned into stem cells. Less than five years after the discovery of this method, researchers do not know how it works, but the process involves adding proteins that can turn genes on and off to the adult cells.
Stem cells, before they can be utilized to make repairs in the human body, must be grown and directed into becoming the desired cell type. Researchers typically use surfaces of animal cells and proteins for stem cell habitats, but these gels are expensive to make, and batches vary depending on the individual animal. "You don't really know what's in there," said Joerg Lahann associate professor of chemical engineering and biomedical engineering at the Ann Arbor-based institution.
Read more ..
The Digital Edge
|Doug Bernard||May 24th 2012|
It only lasted for about 8 hours, but that was long enough to start a whole new round of Internet rumor and worry. On Sunday, May 20th, Pakistani telecommunications authorities suddenly blocked all access to the micro-blogging site Twitter, effectively shutting off the service within Pakistan. Then, just as suddenly, service was restored that evening, leaving behind angry web activists and charges about why access was cut off in the first place. The official reason given: concerns about an event that’s come to be known as “Everybody Draw Muhammad Day.”
As background, in 2010, a Seattle-based cartoonist, angered by death threats made by some Islamic activists against the animation team behind South Park, urged people to draw images of the prophet Muhammad on May 20 and post them online. Free-speech advocates quickly turned the idea into a satiric event, which drew worldwide headlines and angry responses from those Muslims who consider images of any of the prophets to be blasphemous. At the time authorities in Pakistan were so angered that they blocked access Facebook until the social network agreed to remove pages promoting the event for users in India and Pakistan. (The cartoonist, Molly Norris, has since distanced herself from the event after receiving what the FBI called a “very serious” threat.) Read more ..
The Farming Edge
Josh Brill and Meadow Squire grow vegetables and rice in Tinmouth, Vermont. They wanted to expand their rice production last fall, but lacked the needed funds to do it. So they posted a six-minute video on Kickstarter, a crowd-sourced funding website. Seventy-six people thought enough of the couple’s dream to send them money. Brill and Squire raised over $6,000.
Thousands of Americans use Kickstarter to raise money for specific projects. The site launched in 2009 primarily to help artists and musicians but today, inventors, entrepreneurs and a growing number of farmers are also using the site. Scott Nelson of Friendly Folk Farm in Brookfield, Vermont, is one of them. He wanted to document the growth and development of his farm - to create a kind of how-to video for others interested in organic farming. He raised nearly $9,000 on Kickstarter.
To raise money on Kickstarter, you have to have a specific, creative project in mind - one approved by the website. Many entrepreneurs, like Brill and Squire, include a video to explain what their project is and why people should support it. There’s also a deadline for raising the cash - typically about 30 days. To entice people to pledge, projects also include a list of thank you gifts for various levels of support. Brill and Squire gave supporters packs of seeds, rice they’d harvested, and good karma points. “Yeah," Squire says with a laugh. "Everyone needs more Karma, I think.” Read more ..
The Edge of Space
|Suzanne Presto||May 23rd 2012|
|credit: Chris Thompson/SpaceX|
The private U.S. company Space Exploration Technologies, known as SpaceX, successfully launched its Falcon 9 rocket and reusable Dragon space capsule from Cape Canaveral in Florida before dawn Tuesday.
“Three, two, one, zero and launch of the SpaceX Falcon 9 rocket, as NASA turns to the private sector to resupply the International Space Station,” announced NASA launch commentator George Diller as the rocket, carrying the Dragon space capsule, soared into the dark sky. The unmanned Dragon capsule is heading to the International Space Station, an orbiting lab that zooms around the Earth at more than 32,000 kilometers per hour. It is the first time a private spacecraft has attempted to catch up to the orbiting lab, a feat that has only been achieved by official space agences of the United States, Russia, Europe and Japan.
NASA Administrator Charlie Bolden grinned as he spoke to journalists at the Kennedy Space Center in Florida after the successful launch. “The significance of this day cannot be overstated,” said Bolden. “A private company has launched a spacecraft to the International Space Station that will attempt to dock there for the first time. And, while there is a lot of work ahead to successfully complete this mission, we are certainly off to a good start, and I hope you would all agree on that.” Read more ..
The 2012 Vote
As the U.S. presidential election campaigns heat up, the economic debate is dominated by bailouts, austerity and, inevitably, taxation. Now a new study published in Symbolic Interaction asks why tax is such an important issue to voters and explores the moral ideas which underpin their views.
Americans are famously hostile to taxes even though they are not heavily taxed in comparison to Canadians and the British. In their study Dr Jeff Kidder and Dr Isaac Martin, from Northern Illinois University and the University of California-San Diego, explore how middle class feelings of exploitation lie behind this hostility. "Everyday tax talk among the middle class is not simply part of a wider ideological view about economics or free markets," said Kidder. "Tax talk is morally charged and resonates with how Americans see themselves and their place in society." Read more ..
The Canine Edge
|Rick Pantaleo||May 23rd 2012|
Exactly where man’s best friend came from remains a mystery. Thousands of years of cross-breeding have made it difficult for scientists to trace the ancient genetic roots of today’s dogs. Still, British researchers gave it a try. They recently compared genetic data from 1,375 modern-day dogs, from 35 different breeds, to global archeological records of dog remains. Although, other genetic studies suggest dogs descended from the grey wolf, the researchers found modern dog breeds, genetically speaking, have little in common with their ancient ancestors.
Dogs were the first animals domesticated by man about 15,000 years ago. However, we really didn’t start keeping them as pets until about 2,000 years ago. Even so, until fairly recently, most dogs were kept and used to perform specific jobs. Although some dog breeds – such as the Akita, Afghan Hound and the Chinese Shar-Pei – have been classified as ancient by canine experts, they’re no closer to the first domesticated dogs than any other modern breeds. This, according to the study, is again due to cross-breeding through the years.
Other aspects affecting the dog’s genetic diversity include human movement and migration. Major worldwide events, such as the two world wars, also impacted the dog population, the researchers said. Breeds like the Saluki appear genetically different because they were geographically isolated and were not part of the 19th century efforts to blend lineages to create most of the breeds we keep as pets today. Lead author Greger Larson, an evolutionary biologist in Durham University’s Department of Archaeology, said, “Ironically, the ubiquity of dogs combined with their deep history has obscured their origins and made it difficult for us to know how dogs became man’s best friend. All dogs have undergone significant amounts of cross-breeding to the point that we have not yet been able to trace all the way back to their very first ancestors.”
Read more ..
The Weapon's Edge
|Tafline Laylin||May 22nd 2012|
Biomimicry is one of the smartest contemporary approaches to design, so it was inevitable that Israeli researchers would apply this science to their military designs. Like the Iranian home that mimics a snail’s form in order to stay cool and a bottle inspired by the Namib desert beetle that can harvest water in one of the driest places on earth, Israel Aerospace Industries’ (AIA) latest insect drone, their smallest to date at only 20 grams, takes its intelligence, form and other properties from one of nature’s finest creatures: the butterfly.
An indoor butterfly
The Butterfly drone can perform tricks that have never before been achieved by a surveillance device. It can fly indoors, thereby enabling covert information gathering during meetings inside buildings, at train stations and other public buildings as well as outdoors, and it is equipped with a tiny 0.15 gram camera that takes color photographs. Read more ..
The Ancient Edge
|Adam Phillips||May 22nd 2012|
Most scientists agree that the Earth is undergoing significant climate change, partly due to the greenhouse gases produced when fossil fuels like oil, gas and coal are burned. However, earth scientists know that the planetary environment has always been in flux. Some of those changes have caused extinctions on a massive scale. However, for humans, higher apes and other large mammals, environmental fluctuations have sometimes been a goad to adaptation.
Geologists and climatologists, who specialize in the physical earth sciences, came together with biologists, paleontologists and anthropologists, who mainly concern themselves with life on Earth, for a symposium at Columbia University's Lamont-Doherty Earth Observatory, to discuss the question, “Did Climate Change Shape Human Evolution?” “This is a meeting I’ve been trying to have for, I’d say, at least the last 10 years,” says Peter deMenocal, of Columbia University’s Department of Earth and Environmental Sciences, who organized the multi-disciplinary event. “The message from earth’s history is that climate has played a role in every major faunal change event in recorded history. That said, this question of how climate shaped or may have been involved in human evolution is very much an open one we don’t have an answer to. But we’ve got some very intriguing initial clues that point to a strong relationship.” Read more ..
The Health Edge
|Jessica Berman||May 22nd 2012|
An independent panel of U.S. public health officials is recommending that physicians no longer use a blood test to screen men for prostate cancer. The Congressionally-created advisory group, the U.S. Preventive Services Task Force, says the widely-used test does more harm than good. Prostate cancer is the second most commonly diagnosed cancer among men in the U.S. Last year, more than 240,000 mostly older men in their 60s got the news. An estimated 33,000 died of the disease.
The prostate is a small, walnut-shaped organ that’s part of the male reproductive system, producing the fluid that carries sperm. Since the 1990s, the so-called prostate specific antigen or PSA test has been a routine part of medical care for men aged 55 and older in the U.S. and other developed countries. The PSA test measures levels of a protein in the blood that are elevated in the presence of prostate cancer. If cancer is found, it is treated aggressively, in nearly 90 percent of patients, with radiation, surgery or estrogen therapy designed to shrink the tumor. But the PSA test has a high rate of false positives. So, men who turn out to have no cancer at all, or whose tumors are so small they pose no real health threat, often get unnecessary interventions such as uncomfortable and medically risky prostate tissue biopsies. Read more ..
The Chemical Edge
|Layne Cameron||May 20th 2012|
Rubber supplies are in peril, and automobile tire producers are scrambling to seek alternative solutions.
Tom Sharkey, chairperson of the Michigan State University biochemistry and molecular biology department, believes isoprene, a gas given off by many trees, ferns and mosses, could be a viable option. Some plants use it as a mechanism to tolerate heat stress as opposed to most crops, which stay cool through evaporation.
Sharkey’s research team already has measured rates of isoprene emission from plants that are used by the Environmental Protection Agency to predict lower-atmosphere ozone levels. His team also has created models to measure how much isoprene plants release on a global scale. Given the amounts of isoprene made by plants, finding a way to produce a synthetic version for the rubber industry seemed like the next logical step, Sharkey said. Read more ..
The Health Edge
|Beth Gavrilles ||May 19th 2012|
University of Georgia
The rate at which the rabies virus evolves in bats may depend heavily upon the ecological traits of its hosts, according to researchers at the University of Georgia, the U.S. Centers for Disease Control and Prevention and Katholieke Universiteit Leuven in Belgium. Their study found that the host's geographical location was the most accurate predictor of the viral rate of evolution. Rabies viruses in tropical and sub-tropical bat species evolved nearly four times faster than viral variants in bats in temperate regions.
"Species that are widely distributed can have different behaviors in different geographical areas," said Daniel, the study's leader. "Bats in the tropics are active year-round, so more rabies virus transmission events occur per year. Viruses in hibernating bats, on the other hand, might lose up to six months' worth of opportunities for transmission."
Understanding the relationship between host ecology and viral evolution rates could shed light on the transmission dynamics of other viruses, such as influenza, that occur across regions, infect multiple host species or whose transmission dynamics are impacted by anthropogenic change. Read more ..
The Weather Edge
DOE & Agencies
Pollution is warming the atmosphere through summer thunderstorm clouds, according to a computational study published May 10 in Geophysical Research Letters. How much the warming effect of these clouds offsets the cooling that other clouds provide is not yet clear. To find out, researchers need to incorporate this new-found warming into global climate models.
Pollution strengthens thunderstorm clouds, causing their anvil-shaped tops to spread out high in the atmosphere and capture heat -- especially at night, said lead author and climate researcher Jiwen Fan of the Department of Energy's Pacific Northwest National Laboratory. "Global climate models don't see this effect because thunderstorm clouds simulated in those models do not include enough detail," said Fan. "The large amount of heat trapped by the pollution-enhanced clouds could potentially impact regional circulation and modify weather systems." Clouds are one of the most poorly understood components of Earth's climate system. Called deep convective clouds, thunderstorm clouds reflect a lot of the sun's energy back into space, trap heat that rises from the surface, and return evaporated water back to the surface as rain, making them an important part of the climate cycle. Read more ..
The Koreas on Edge
|Steve Herman||May 18th 2012|
Japan has successfully launched a South Korean satellite. The historical accomplishment puts the Japanese in the same arena as European and Russian entities in the lucrative commercial space launch business. The roar of the H-2A launch vehicle shattered the early morning silence On the southern Japanese island of Tanegashima. The space center was illuminated as the liquid-fueled 57-meter high two-stage rocket rose off the pad with four satellites on board. Sixteen minutes after launch, the Japan Aerospace Exploration Agency (JAXA) announced the first payload had successfully separated.
The Arirang-3 satellite (also known as KOMPSAT-3) was then placed into orbit. The Korean Aerospace Research Institute (KARI) says it is functioning normally. Also deployed Friday from the H-2A rocket was a satellite with the world's largest revolving antenna. The Advanced Microwave Scanning Radiometer 2 (AMSR2) is able to measure water temperature from the sea surface with an accuracy of 0.5 degrees Celsius. Scientists say the Japanese satellite, nick-named “Shizuku,” will play an important role in monitoring global water circulation and climate change. Read more ..
The Medical Edge
The baseline level of distrust is distinct and separable from our inborn lie detector. Fool me once, shame on you. Fool me twice, shame on my parahippocampal gyrus.
Scientists at the Virginia Tech Carilion Research Institute have found that suspicion resides in two distinct regions of the brain: the amygdala, which plays a central role in processing fear and emotional memories, and the parahippocampal gyrus, which is associated with declarative memory and the recognition of scenes.
"We wondered how individuals assess the credibility of other people in simple social interactions," said Read Montague, director of the Human Neuroimaging Laboratory and the Computational Psychiatry Unit at the Virginia Tech Carilion Research Institute, who led the study. "We found a strong correlation between the amygdala and a baseline level of distrust, which may be based on a person's beliefs about the trustworthiness of other people in general, his or her emotional state, and the situation at hand. What surprised us, though, is that when other people's behavior aroused suspicion, the parahippocampal gyrus lit up, acting like an inborn lie detector." Read more ..
The Digital Edge
With a GPS receiver in your smart-phone, you can navigate your way over highways and streets with certainty. But once you get inside a building, it provides no further assistance. That’s why Fraunhofer researchers, together with the Bosch Corporation and other partners, have engineered a navigation system for interior spaces. Thanks to a clever combination of sensors, the module tracks the movements and position of its user in precise detail. At the Sensor+Test trade fair in Nuremberg from May 22-24, 2012, researchers will deliver a live demonstration of how this new interior-space navigation operates.
A smart-phone with GPS functionality is a delightful tool. It guides its owner safely and with certainty through the streets of an unfamiliar city. But after arriving at the destination, all too often the orientation is gone, because as soon as you enter a building, you lose contact with the GPS satellites. Then you are on your own – whether in the interminable hallways of the trade fair complex, or inside one of the branches of the local megaplex shopping mall. “Wouldn't it be helpful,” Harald von Rosenberg thought to himself, “if at such moments the smart-phone could quickly shift to an interior space navigator, and point the way through the rows of shops and stairwells?” Well, that is absolutely possible, as the project manager for “motion control systems” at the Stuttgart-based Fraunhofer Institute for Manufacturing Engineering and Automation IPA now demonstrates through the “MST-Smartsense” cooperation project from the German Federal Ministry for Education and Research BMBF. Read more ..
The Toxic Edge
|George Hunka||May 15th 2012|
Tel Aviv University
|Garfield Peak Trail, Crater Lake (credit: Mark Gorzynski)|
From man-made toxic chemicals such as industrial by-products to poisons that occur naturally, a water or food supply can be easily contaminated. And for every level of toxic material ingested, there is some level of bodily response, ranging from minor illness to painful certain death.
Biosensors have long been used to safeguard against exposure to toxic chemicals. Food tasters employed by the ancients acted as early versions of biosensors, determining if a meal had been poisoned. More modern examples include the use of fish, which may alter their swimming characteristics if a toxic material is introduced into to the water. But although current warning systems are more sophisticated, they require equipment and time that a soldier in the field or an adventurer in the wilderness do not have.
Now Prof. Yosi Shacham-Diamand, Vice Dean of Tel Aviv University’s Faculty of Engineering, along with Prof. Shimshon Belkin of the Institute of Life Sciences at the Hebrew University of Jerusalem, has married biology and engineering to produce a biosensor device called the “Dip Chip,” which detects toxicity quickly and accurately, generating low false positive and false negative readings. Read more ..
The Edge of Space
Southwest Research Institute
A team of researchers led by a NASA Lunar Science Institute (NLSI) member based at Southwest Research Institute has discovered evidence that the giant impact crater Rheasilvia on Asteroid (4) Vesta was created in a collision that occurred only about 1 billion years ago, much more recently than previously thought. This result is based on the analysis of high-resolution images obtained with the Dawn spacecraft, which entered orbit around Vesta in July 2011.
In addition to creating the crater, the impact is believed to have launched a large number of fragments into space, some of which later escaped the main belt and possibly hit the Earth. Vesta, the second-most massive body in the main asteroid belt, is believed to have formed within the first few million years after the earliest solar system solids (~4.6 billion years ago). According to models, its early evolution occurred in an environment where collisions with other asteroids were much more frequent than they are today. It was thought that one such early collision on Vesta created a swarm of fragments, which we now call an asteroid family. Although Vesta and its family are located between Mars and Jupiter, smaller pieces of these asteroids can be found in meteorite collections on Earth, including most eucrite, howardite and diogenite meteorites. Several large craters on Vesta were first inferred by Hubble Space Telescope imaging. Read more ..
The Edge of Agriculture
|Susan Kraemer||May 14th 2012|
Here’s another futuristic invention that could completely change the future of agriculture in a desertifying world. Substituting an industrially produced hydrogel for soil makes it possible to farm on sterile desert sand. Similarly to Pink LEDs Grow Future Food with 90% Less Water, this amazing sci fi technology allows the farming of the desert, with 80 percent less water than needed in traditional farming.
The hydrogel technology is the invention of Waseda University Visiting Professor Yuichi Mori, who has years of experience in developing polymeric membranes for use in medical technologies such as blood purification and oxygen enrichment. But Mori saw the greatest need was in desert farming in a future world faced with explosive population growth, but diminishing potential for traditional soil-based agriculture due to soil degradation, erosion, and drought. His hydrogel membrane–based plant cultivation technology has a unique membrane technology. The simple system is much more portable than traditional hydroponics. Read more ..
Earth on Edge
|Pedro Teixeira||May 13th 2012|
Spanish Foundation for Science and Technology
|Eyjafjallajökull eruption, Apr 2010 (© 2010/credit: Marco Fulle)|
In May 2010, the ash cloud from the Icelandic volcano Eyjafjallajökull reached the Iberian Peninsula and brought airports to a halt all over Europe. At the time, scientists followed its paths using satellites, laser detectors, sun photometers, and other instruments. Two years later they have now presented the results and models that will help to prevent the consequences of such natural phenomena.
The eruption of Eyjafjallajökull in the south of Iceland began on 20 March 2010. On 14 April, it began to emit a cloud of ash that moved towards Northern and Central Europe, resulting in the closure of airspace. Hundreds of planes and millions of passengers were grounded. After a period of calm, volcanic activity intensified once again on 3 May. This time the winds transported the aerosols (a mixture of particles and gas) towards Spain and Portugal, where some airports had to close between 6 and 12 May. This was also a busy time for scientists, who took advantage of the situation to monitor the phenomenon. Read more ..
The Prehistoric Edge
|Kendra Snyder||May 13th 2012|
American Museum of Natural History
Despite years of intensive research about the extinction of non-avian dinosaurs about 65.5 million years ago, a fundamental question remains: were dinosaurs already undergoing a long-term decline before an asteroid hit at the end of the Cretaceous? A study led by scientists at the American Museum of Natural History gives a multifaceted answer. The findings, published in Nature Communications, suggest that in general, large-bodied, “bulk-feeding” herbivores were declining during the last 12 million years of the Cretaceous. But carnivorous dinosaurs and mid-sized herbivores were not. In some cases, geographic location might have been a factor in the animals’ biological success.
“Few issues in the history of paleontology have fueled as much research and popular fascination as the extinction of non-avian dinosaurs,” said lead author Steve Brusatte, a Columbia University graduate student affiliated with the Museum’s Division of Paleontology. “Did sudden volcanic eruptions or an asteroid impact strike down dinosaurs during their prime? We found that it was probably much more complex than that, and maybe not the sudden catastrophe that is often portrayed.” Read more ..
The Edge of Space
|Karen C. Fox ||May 13th 2012|
|Artist's conception of IBEX in high Earth orbit (credit: NASA GSFC)|
For the last few decades, space scientists have generally accepted that the bubble of gas and magnetic fields generated by the sun—known as the heliosphere—moves through space, creating three distinct boundary layers that culminate in an outermost bow shock. This shock is similar to the sonic boom created ahead of a supersonic jet. Earth itself certainly has one of these bow shocks on the sunward side of its magnetic environment, as do most other planets and many stars. A collection of new data from NASA’s Interstellar Boundary Explorer (IBEX), however, now indicate that the sun does not have a bow shock.
For a paper appearing in Science Express, scientists compiled data from IBEX, NASA’s twin Voyager spacecraft, and computer models to show that the heliosphere just isn’t moving fast enough to create a bow shock in the tenuous and highly magnetized region in our local part of the galaxy.
“IBEX gives a global view. It shows the whole of this region,” says Eric Christian, the mission scientist for IBEX at NASA’s Goddard Space Flight Center in Greenbelt, Md. and who was formerly the program scientist for Voyager. “At the same time the Voyager spacecraft are actually there, in situ, measuring its environment at two locations. The combination of IBEX and Voyager gives you great science and now the new IBEX results strongly indicate that there is no bow shock.” Read more ..
The Health Edge
|Paula Walcott-Quintin||May 13th 2012|
Researchers at Rutgers University have uncovered a new way to stimulate activity of immune cell opiate receptors, leading to efficient tumor cell clearance. Sarkar, professor in the Department of Animal Sciences at the Rutgers School of Environmental and Biological Sciences and his research team have been able to take a new pharmacological approach to activate the immune cells to prevent cancer growth through stimulation of the opiate receptors found on immune cells.
This research, funded by the National Institutes of Health-National Institute on Alcohol Abuse and Alcoholosm. It describes two structurally different but functionally similar opioid receptors, Mu- and Delta-opioid receptors. These receptors form protein complexes as either two structurally similar receptors as a homodimer—formed by two identical molecules—or two structurally dissimilar protein complexes as a heterodimer—formed by ethanol inducement—in immune cells. The team pharmacologically fooled these two structurally different but functionally similar opioid receptors to form more homodimers so that opioid peptide increases the immune cells’ ability to kill tumor cells. Read more ..
The Environmental Edge
|Yoshihide Wada||May 12th 2012|
As people pump groundwater for irrigation, drinking water, and industrial uses, the water doesn’t just seep back into the ground — it also evaporates into the atmosphere, or runs off into rivers and canals, eventually emptying into the world’s oceans. This water adds up, and a new study calculates that by 2050, groundwater pumping will cause a global sea level rise of about 0.8 millimeters per year.
“Other than ice on land, the excessive groundwater extractions are fast becoming the most important terrestrial water contribution to sea level rise,” said Yoshihide Wada, with Utrecht University in the Netherlands and lead author of the study. In the coming decades, he noted, groundwater contributions to sea level rise are expected to become as significant as those of melting glaciers and ice caps outside of Greenland and the Antarctic. Between around 1970 and 1990, sea level rise caused by groundwater pumping was cancelled out as people built dams, trapping water in reservoirs so the water wouldn’t empty into the sea, Wada said. His research shows that starting in the 1990s, that changed as populations started pumping more groundwater and building fewer dams. Read more ..
The Robotic Edge
|Nick Flaherty||May 12th 2012|
The Bristol Robotics Lab is a partnership between UWE Bristol (University of the West of England) and the University of Bristol. It is home to 70 academics and businesses who are leading current thinking in 'nouvelle' and service robotics, intelligent autonomous systems and bio-engineering. Over £1.65 million has been spent on the new facilities which cover 2,400 sqm, with over 300 metres of specialised laboratory space and two Flying Arenas.
"This is probably the largest robotics lab in Europe," said Libor Kral, Head of Unit Cognitive Systems for Interaction Robotics at the European Commission. Robotics is a key element for Eruipe, he says. "In the current framework we have over 100 projectsa and E500m for robotics enabling technology and this is the largest no-military funding project in the world for robotics." The next set of European Framework projects will concentrate more on industrial led developments and new efforts to attract industrial partners, he said. Read more ..
|Martin Barillas||May 11th 2012|
Cutting Edge Senior Correspondent
|Great Lakes sturgeon and spawning reef|
The construction of rock reefs in Great Lakes waterways are expected to aid in the survival of fish. The rock reefs are designed to assist several native species that are considered threatened or endangered in Michigan, including lake sturgeon, mooneye, the northern madtom catfish and the river redhorse sucker. Walleye, a popular sport fish, and commercially important lake whitefish should also benefit, according to a release from the University of Michigan.
The new reefs will be constructed in the Middle Channel of the St. Clair River delta, not far from Detroit and near an existing lake sturgeon spawning site. The $1.1 million St. Clair project is a follow-up to rock reefs built on the Detroit River in 2004 and 2008.
"We've been working together on these reefs for more than 10 years now, and over the course of time we've really figured out what kinds of physical characteristics the fish are attracted to," said project leader Jennifer Read, acting director of Michigan Sea Grant, a cooperative program of the University of Michigan and Michigan State University. Michigan Sea Grant is a Center of Excellence at the U-M School of Natural Resources and Environment. Read more ..
The Edge of Space
|Stuart Wolpert||May 11th 2012|
|Artist's Conception of Dawn spacecraft observing Vesta|
(credit: NASA JPL; Caltech)
When UCLA’s Christopher T. Russell looks at the images of the protoplanet Vesta produced by NASA’s Dawn mission, he talks about beauty as much as he talks about science. “Vesta looks like a little planet. It has a beautiful surface, much more varied and diverse than we expected,” said Russell, a professor in UCLA’s Department of Earth and Space Sciences and the Dawn mission’s principal investigator. “We knew Vesta’s surface had some variation in color, but we did not expect the diversity that we see or the clarity of the colors and textures, or their distinct boundaries. We didn’t find gold on Vesta, but it is still a gold mine.”
There are six new papers about Vesta, named for the ancient Roman goddess of the hearth, in the May 11 edition of Science, and Russell is a co-author on all of them.
Dawn has been orbiting Vesta and collecting data on the protoplanet’s surface since July 2011. Vesta, which is in the asteroid belt between Mars and Jupiter, is currently some 321 million miles from Earth. Russell and his scientific team expected to find one large crater on Vesta, but they were surprised to find two, with the larger one—about 344 miles across—essentially on top of the smaller. Read more ..
The Race for Alt Fuel
|Michael Bernstein||May 11th 2012|
American Chemical Society
A detailed description of development of the first practical artificial leaf—a milestone in the drive for sustainable energy that mimics the process, photosynthesis, that green plants use to convert water and sunlight into energy—appears in the ACS journal Accounts of Chemical Research. The article notes that unlike earlier devices, which used costly ingredients, the new device is made from inexpensive materials and employs low-cost engineering and manufacturing processes.
Daniel G. Nocera points out that the artificial leaf responds to the vision of a famous Italian chemist who, in 1912, predicted that scientists one day would uncover the “guarded secret of plants.” The most important of those, Nocera says, is the process that splits water into hydrogen and oxygen.
The artificial leaf has a sunlight collector sandwiched between two films that generate oxygen and hydrogen gas. When dropped into a jar of water in the sunlight, it bubbles away, releasing hydrogen that can be used in fuel cells to make electricity. These self-contained units hold promise for making fuel for electricity in remote places and the developing world, but designs demonstrated thus far rely on metals like platinum and manufacturing processes that make them cost-prohibitive. Read more ..
The Edge of Space
|Madeleine Russell||May 10th 2012|
UK Space Agency
|Artist's Conception: Massive black hole disrupts star formation|
(credit: NASA/JPL-Caltech/R. Hurt)
Astronomers, using the ESA’s Herschel Space Observatory, have shown that the number of stars that form during the early lives of galaxies may be influenced by the massive black holes at their hearts. This helps explain the link between the size of the central bulges of galaxies and the mass of their central black holes.
All large galaxies have a massive black hole at their centre, each millions of times the mass of a single star. For over a decade, scientists have been puzzled as to why the masses of the black holes are linked to the size of the round central bulges at the hearts of galaxies. The suspicion has long been that the answer lies in the early lives of the galaxies, when the stars in the bulge were forming. To study this phase, astronomers need to look at very distant galaxies, so far away that we see them as they were billions of years ago.
Although the black holes themselves cannot be seen, the material closest to them can get incredibly hot, emitting large amounts of light over a very wide range of wavelengths, from radio waves to x-rays. The light from this super-heated material can be trillions of times as bright as the Sun, with brighter emissions indicating a more massive black hole. There are also strong flows of material (winds and jets) expelled from the region around the black hole. Read more ..
The Way We Are
|David Aldridge||May 10th 2012|
University of Cambridge
|Asian wild horse, closest living relative of original domesticated horses|
New research indicates that domestic horses originated in the steppes of modern-day Ukraine, southwest Russia and west Kazakhstan, mixing with local wild stocks as they spread throughout Europe and Asia. The research was published recently in PNAS.
For several decades, scientists puzzled over the origin of domesticated horses. Based on archaeological evidence, it had long been thought that horse domestication originated in the western part of the Eurasian Steppe (Ukraine, southwest Russia and west Kazakhstan); however, a single origin in a geographically restricted area appeared at odds with the large number of female lineages in the domestic horse gene pool, commonly thought to reflect multiple domestication events across a wide geographic area.
In order to solve the perplexing history of the domestic horse, scientists from the University of Cambridge used a genetic database of more than 300 horses sampled from across the Eurasian Steppe to run a number of different modelling scenarios.
Their research shows that the extinct wild ancestor of domestic horses, Equus ferus, expanded out of East Asia approximately 160,000 years ago. They were also able to demonstrate that Equus ferus was domesticated in the western Eurasian Steppe, and that herds were repeatedly restocked with wild horses as they spread across Eurasia. Read more ..
The Environmental Edge
Jonathan Overpeck, professor of Atmospheric Sciences and Geosciences at the University of Arizona, brought a friendly smile, informative graphics and a warning about drought in the Southwest to Sandia’s Climate Change and National Security Speaker Series.
Addressing “Climate Change and the Aridification of the North American Southwest and Beyond,” Overpeck placed water-glass graphic images at key water-storage locations in the Southwest to show how full the reservoirs are. Many glasses are more than half-empty, he said, and computer simulations predict the situation will worsen.
Overpeck has authored more than 150 published papers in climate and environmental sciences. He was coordinating lead author for the Nobel Prize-winning U.N. Intergovernmental Panel on Climate Change (fourth assessment).
In an effort to shed light on the wide spectrum of thought regarding the causes and extent of changes in Earth’s climate, Sandia National Laboratories has invited experts from a wide variety of perspectives to present their views in the Climate Change and National Security Speaker Series.
Overpeck recounted unprecedented heat waves that included a growing number of days above 110 degrees in Phoenix and the 840-square-mile Wallow Fire last May, the biggest wildfire ever in New Mexico and Arizona. He pointed to major floods that, by National Oceanic and Atmospheric Administration estimates, have caused $53 billion in damages. He also mentioned a record tornado season and an unusually wet and destructive tropical storm. “The temperature record for March 2012 (8.6 degrees above the 20th century average for that month) was big news,” he said. Read more ..
The Way We Are
|Stuart Wolpert||May 9th 2012|
|Achiral triangles that have formed chiral super-structures|
(credit: Thomas G. Mason and Kun Zhao)
The overwhelming majority of proteins and other functional molecules in our bodies display a striking molecular characteristic: They can exist in two distinct forms that are mirror images of each other, like your right hand and left hand. Surprisingly, each of our bodies prefers only one of these molecular forms.
This mirror-image phenomenon—known as chirality or “handedness”—has captured the imagination of a UCLA research group led by Thomas G. Mason, a professor of chemistry and physics and a member of the California NanoSystems Institute at UCLA. Mason has been exploring how and why chirality arises, and his newest findings on the physical origins of the phenomenon were published May 1 in the journal Nature Communications. “Objects like our hands are chiral, while objects like regular triangles are achiral, meaning they don’t have a handedness to them,” said Mason, the senior author of the study. “Achiral objects can be easily superimposed on top of one another.”
Why many of the important functional molecules in our bodies almost always occur in just one chiral form when they could potentially exist in either is a mystery that has confounded researchers for years. “Our bodies contain important molecules like proteins that overwhelmingly have one type of chirality,” Mason said. “The other chiral form is essentially not found. I find that fascinating. We asked, ‘Could this biological preference of a particular chirality possibly have a physical origin?’” Read more ..
The Edge of Space
European Southern Obervatory
|VISTA IR image of M55 in Sagitarius|
(credit: ESO; J. Emerson; VISTA; Cambridge Astronomical Survey Unit)
Globular clusters are held together in a tight spherical shape by gravity. In Messier 55, the stars certainly keep close company: approximately one hundred thousand stars are packed within a sphere with a diameter of only about 100 light years (about 25 times the distance between the Sun and the nearest star system, Alpha Centauri).
About 160 globular clusters have been spotted circling our galaxy, the Milky Way, mostly toward its bulging centre. The two latest discoveries, made using VISTA, were recently announced by ESO. The largest galaxies can have thousands of these rich collections of stars in orbit around them.
Observations of globular clusters' stars reveal that they originated around the same time—more than 10 billion years ago—and from the same cloud of gas. As this formative period was just a few billion years after the Big Bang, nearly all of the gas on hand was the simplest, lightest and most common in the cosmos: hydrogen, along with some helium and much smaller amounts of heavier chemical elements such as oxygen and nitrogen. Being made mostly from hydrogen distinguishes globular cluster residents from stars born in later eras, like our Sun, that are infused with heavier elements created in earlier generations of stars. The Sun lit up some 4.6 billion years ago, making it only about half as old as the elderly stars in most globular clusters. The chemical makeup of the cloud from which the Sun formed is reflected in the abundances of elements found throughout the Solar System—in asteroids, in the planets, and in our own bodies. Read more ..
The Edge of Space
|Nicole Hagey and Dewayne Washington||May 8th 2012|
The Tracking and Data Relay Satellite 4 (TDRS-4) recently completed almost 23 years of operations support and successfully completed end-of-mission de-orbit and decommissioning activities. TDRS-4's operational life span was well beyond its original 10-year design.
Launched on March 13, 1989, from onboard Space Shuttle Discovery, TDRS-4 operated in geosynchronous (GEO) altitude at more than 22,000 miles above the Atlantic Ocean region. As part of the spacecraft's end-of-mission activities, its orbit was raised above the congested geosynchronous orbit.
TDRS-4 was forced to retire after the loss of one of three Nickel-Cadmium (24 cell) batteries and the reduction in storage capacity for the two remaining batteries that power the satellite. Retirement for the satellite consisted of excess fuel depletion, disconnecting batteries, and powering down the Radio Frequency Transmitters and receivers so that the satellite is completely and permanently passive. This ensures the satellite will never interfere with other satellites from the radio frequency perspective. Read more ..
The Education Edge
Hundreds of teenagers push past security guards and police at the Six Flags America amusement park in Maryland, and make a dash for the roller coasters.They are here for the one day a year the amusement park is closed to the general public, while the roller coasters and other thrill rides become tools in a unique learning experience. It's called Physics Day and to complete their assignments, the students are required to ride.
“My teaching philosophy for physics is that they need to see it, touch it, do it,” says teacher Sonia Faletti. “You don’t learn physics by listening. ”Faletti teaches physics at Bishop Ireton High School in Alexandria, Virginia. She is here with her honors students. Today, they get to experience what they studied in class. Faletti uses amusement park videos throughout the year. Her students have done the math problems and diagrams, explaining the physics behind the rides. Today they carry instruments to help them do their own calculations.
One is called an accelerometer, which measures the force of gravity on the roller coaster. Another is a protractor to measure centripetal force on the circle rides. An instrument, worn securely in a vest, records and displays data gathered during the thrill rides.
A more sophisticated device, worn securely in a vest, records and displays graphs on a computer tablet. “You can get the ups and downs of the ride from the barometer readings,” Faletti says. “You can correlate the 'Okay, I felt heavy here. That was the dip.' Or 'I felt weightless at this point, I was going over the hill.'” Read more ..
The Way We Are
May 8, 1977. Ithaca, New York: Cornell University’s barn-like Barton field house, specifically. On that particular Sunday evening, for the princely sum of $7.50—$6.50 for students—you could buy one general admission ticket (assuming you could find any for sale) to hear a performance by the Grateful Dead.
For the Dead it was just another gig on an unending tour; the Ithaca stop was sandwiched between New Haven’s Veteran’s Memorial Coliseum and Buffalo’s War Memorial Coliseum. Fairly to form, the band played 20 songs that night, starting with “New Minglewood Blues” and wrapping with the classic “One More Saturday Night.” Along the way they hit a number of fan favorites like “Fire on the Mountain,” “Not Fade Away” and “Morning Dew.”
At the time, May 8th was just another performance by the Dead, an enduring American band that had long attracted its own rolling culture of scruffy fans, hippies, dope-smokers, and assorted others who followed the band from show to show. But for true “Deadheads,” it’s much, much more than that. For Deadhead Nation, May 8 is forever known simply as “Barton Hall.”
35 years later, the Dead’s spring 1977 tour is now the stuff of legend, with the Barton Hall show the most celebrated performance of the band’s career. “I started hearing from other Deadheads that the Barton show was famous,” Brad Krakow tells the Cornell Chronicle. One of the lucky attendees that night, Krakow characterized the Dead’s performance as “tight, no mistakes and inspired. It is funny now when friends ask if that is ‘The’ Barton Hall when visiting. It is an icon.”
But don’t take Krakow’s word for it. Download the entire concert and decide for yourself. In fact, why not download every concert the Grateful Dead ever played to compare and contrast? Go ahead—you can do it all for free, and without any copyright worries, thanks to a website called The Internet Archive. Read more ..
Edge of Computing
|Rick Pantaleo||May 8th 2012|
Imagine having a doorknob that knows whether it should lock or unlock itself, based on how a user grips it; or a smartphone that silences itself if its user puts a finger to his or her lips; or a chair which automatically adjusts the lighting in a room by sensing whether the user is leaning forward or reclining in the chair.
These and other applications could soon be possible with a new sensing technique developed by a collaborative research team of Disney Research, Pittsburgh and Carnegie Mellon University.
The Touché system uses something its developers call Swept Frequency Capacitive Sensing (SFCS), a more advanced form of capacitive touch-sensing technology, which is currently used in the touchscreens of most smartphones.
But, unlike today’s touchscreens which only sense electrical signals at one frequency, Touché’s SFCS technology can monitor signals across a broad range of signals, which would make it possible for the object to not only sense the touch itself, but also to recognize a wide range of complex motions and configurations of the person touching it. Read more ..
The Digital Edge
|Michael Terrazas||May 8th 2012|
Georgia Tech College of Computing
Recently, many U.S. Internet service providers have fallen in line with their international counterparts in capping monthly residential broadband usage. A new study by a Georgia Tech researcher, conducted during an internship at Microsoft Research, shows such pricing models trigger uneasy user experiences that could be mitigated by better tools for monitoring data usage through their home networks.
Home users, the study found, typically manage their capped broadband access against three uncertainties—invisible balances, mysterious processes, and multiple users—and these uncertainties have predictable impacts on household Internet use and can force difficult choices on users. Given the undeniable trend in both Internet norms (such as cloud-based applications) and home-entertainment delivery toward greater broadband requirements, the study seeks to create awareness and empathy among designers and researchers about the experience of Internet use under bandwidth caps.
Marshini Chetty, a postdoctoral researcher in Georgia Tech’s School of Interactive Computing, interviewed 12 households in South Africa, a country in which broadband caps were universal until February 2010. Typically, the caps set by South African ISPs are severe, with some plans only offering 1 GB of data per month. At the time of the study, the caps ranged up to 9GB of data, far lower than the 150GB-250GB caps set by U.S. providers. Read more ..
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