The Edge of Health
|Yivsam Azgad||July 30th 2012|
Several years ago, Prof. Michael Fainzilber and his group in the Biological Chemistry Department made a surprising discovery: Proteins thought to exist only near the cell nucleus could also be found in the far-off regions of the body’s longest cells—peripheral nerve cells that extend processes called axons, reaching up to a meter in length in adult humans.
These proteins, known as importins, have a well-studied role in the vicinity of the nucleus: They shuttle various molecules through the protective nuclear membrane. Fainzilber and his group showed that when a nerve cell is injured somewhere along its length, importins in the long axons hook into a sort of “railcar” mechanism, which then transports the “Help!” message from the injury site all the way to the nucleus.
These findings raised an intriguing question: How did importins get to the axons in the first place? Initial evidence suggested that one critical importin, called importin beta1, is produced locally upon injury near the site where it is needed. The problem was that years of scientific thinking on the subject indicated that proteins do not get manufactured in the axons, as investigations had turned up few of the cellular protein factories known as ribosomes there. Read more ..
The Digital Edge
|Elizabeth Law||July 28th 2012|
California's Silicon Valley, near San Francisco, is world famous as a haven for technology companies, including giants like Google and Facebook. Many young entrepreneurs are bypassing Silicon Valley, though, to start their companies in an area called Silicon Beach.
On the west side of Los Angeles, people from around the world come for the beach, year-round sunshine and warm weather. This also is where Gregg Spiridellis and his brother operate the online comedy and e-card company, JibJab.
“We are two blocks from the beach. It’s 72 degrees [i.e., about 22 degrees Celsius] and sunny every single day,” said Spiridellis.
Tech companies crop up
Spiridellis moved his company 10 years ago from New York to the beach in Los Angeles, after the dot.com crash almost wiped out his company. The move gave new life to his business. “When we first moved out to L.A., there was no technology community. We did not move to Los Angeles for technology in 2002; we moved to artists for creative talent,” he said. Read more ..
The Medical Edge
|Yivsam Azgad||July 27th 2012|
|Human embryonic stem cells (credit: PLoS Biology)|
Stem cells hold great promise for the medicine of the future, but they can also be a cause of disease. When these self-renewing, unspecialized cells fail to differentiate into diverse cell types, they can start dividing uncontrollably, leading to cancer. Several decades ago, Weizmann Institute scientists were among the first to demonstrate the link between cancer and the faulty differentiation of stem cells. Now a new Weizmann Institute-led study, published in Molecular Cell, reveals a potential molecular mechanism behind this link.
The scientists managed to uncover the details of a step in the process of DNA “repackaging” that takes place during embryonic stem cell differentiation. It turns out that for the cells to differentiate properly, certain pieces of the packaging of their DNA must be labeled by a molecular tag called ubiquitin. Such tagging is required for turning on a group of particularly long genes, which enable the stem cell to differentiate.
The researchers identified two switches: An enzyme called RNF20 enhances the tagging, whereas a second enzyme, USP44, does the opposite, shutting it down. Read more ..
The Edge of Medicine
|Robert Sanders||July 25th 2012|
A team of University of California, Berkeley, scientists in collaboration with researchers at the University of Munich and University of Washington in Seattle has discovered a chemical that temporarily restores some vision to blind mice, and is working on an improved compound that may someday allow people with degenerative blindness to see again.
The approach could eventually help those with retinitis pigmentosa, a genetic disease that is the most common inherited form of blindness, as well as age-related macular degeneration, the most common cause of acquired blindness in the developed world. In both diseases, the light sensitive cells in the retina — the rods and cones — die, leaving the eye without functional photoreceptors.
The chemical, called AAQ, acts by making the remaining, normally "blind" cells in the retina sensitive to light, said lead researcher Richard Kramer, UC Berkeley professor of molecular and cell biology. AAQ is a photoswitch that binds to protein ion channels on the surface of retinal cells. When switched on by light, AAQ alters the flow of ions through the channels and activates these neurons much the way rods and cones are activated by light.
"This is similar to the way local anesthetics work: they embed themselves in ion channels and stick around for a long time, so that you stay numb for a long time," Kramer said. "Our molecule is different in that it's light sensitive, so you can turn it on and off and turn on or off neural activity."
Because the chemical eventually wears off, it may offer a safer alternative to other experimental approaches for restoring sight, such as gene or stem cell therapies, which permanently change the retina. It is also less invasive than implanting light-sensitive chips in the eye. Read more ..
The Edge of Space
Comets and asteroids preserve the building blocks of our Solar System and should help explain its origin. But there are unsolved puzzles. For example, how did icy comets obtain particles that formed at high temperatures, and how did these refractory particles acquire rims with different compositions? Carnegie's theoretical astrophysicist Alan Boss and cosmochemist Conel Alexander are the first to model the trajectories of such particles in the unstable disk of gas and dust that formed the Solar System. They found that these refractory particles could have been processed in the hot inner disk, and then traveled out to the frigid outer regions to end up in icy comets. Their meandering trips back and forth could help explain the different compositions of their rims. The research is published in Earth and Planetary Science Letters.
The young Sun is thought to have experienced a series of outbursts caused by the rapid infall of disk gas onto the Sun. The leading mechanism for explaining such outbursts is a phase of disk instability. The researchers modeled the trajectories of several hundred centimeter-sized melilite mineral particles during a phase of disk instability. These particles are similar to calcium-aluminum-rich inclusions (or CAIs), the refractory particles often found in well-preserved meteorites, as well as the comet Wild 2. Read more ..
The Edge of Medicine
|Neal Moawed||July 25th 2012|
Journal of Visualized Experiments
There are many factors that affect tumor invasion, the process where a tumor grows beyond the tissue where it first developed. While factors like genetics, tissue type and environmental exposure affect tumor metastasis and invasion, physical forces like fluid flow remain a poorly understood component of tumor invasion. A new video article in JoVE, the Journal of Visualized Experiments, describes a novel procedure that allows researchers to study and test the microenvironment of a growing tumor. The technique is valuable because it allows scientists to assay tumor invasion attributable to extracellular fluid flow in vitro and better understand the effects of such physical changes on a tumor. The study focuses specifically on a type of extracellular fluid called interstitial fluid, which flows between cells in a tissue. This procedure is a significant first step to develop an in vitro system that better mimics what happens within a growing tumor in the patient.
“Our goal is to understand how physical forces affect how tumor cells behave. By understanding factors influencing why a tumor does or does not spread, we will have a much better understanding of which therapies will affect the tumor,” said author Dr. Adrian Shieh of Drexel University. Read more ..
The Edge of Space
|Kendra Snyder||July 25th 2012|
American Museum of Natural History
|Artist’s conception of black hole pulling gas from a star|
(credit: NASA E/PO, Sonoma State University, Aurore Simonnet)
A new model shows how an elusive type of black hole can be formed in the gas surrounding their supermassive counterparts. In research published in the Monthly Notices of the Royal Astronomical Society, scientists from the American Museum of Natural History, the City University of New York, the Jet Propulsion Laboratory of the California Institute of Technology, and the Harvard-Smithsonian Center for Astrophysics propose that intermediate-mass black holes—light-swallowing celestial objects with masses ranging from hundreds to many thousands of times the mass of the Sun—can grow in the gas disks around supermassive black holes in the centers of galaxies. The physical mechanism parallels the model astrophysicists use to describe the growth of giant planets in the gas disks surrounding stars.
“We know about small black holes, which tend to be close to us and have masses a few to 10 times that of our Sun, and we know about supermassive black holes, which are found in the centers of galaxies and have a mass that’s millions to billions of times the mass of the sun,” said coauthor Saavik Ford, who is a research associate in the Museum’s Department of Astrophysics as well as a professor at the Borough of Manhattan Community College (BMCC), part of the City University of New York (CUNY), and a faculty member at CUNY’s Graduate Center. “But we have no evidence for the middle stage. Intermediate-mass black holes are much harder to find.” Read more ..
The Edge of Climate Change
|Yasmeen Sands||July 24th 2012|
Forest Service PNRS
Forests in the Pacific Northwest store more carbon than any other region in the United States, but our warming climate may undermine their storage potential.
A new study conducted by the U.S. Forest Service's Pacific Northwest Research Station and the Climate Impacts Group at the University of Washington has found that, by 2040, parts of Washington State could lose as much as a third of their carbon stores, as an increasing area of the state's forests is projected to be burned by wildfire. The study is the first to use statistical models and publicly available Forest Inventory and Analysis data to estimate the effects of a warming climate on carbon storage and fluxes on Washington's forests.
"When considering the use of forests to store carbon, it will be critical to consider the increasing risk of wildfire," said Crystal Raymond, a research biologist based at the station's Pacific Wildland Fire Sciences Laboratory and lead author of the study. "Especially in the West, where climate-induced changes in fire are expected to be a key agent of change." Read more ..
The Edge of Archaeology
|Kevin Stacey||July 24th 2012|
University of Chicago Press Journals
Scientists have long speculated that high diabetes rates among Native Americans may have roots in the evolutionary past. "Thrifty" genes that helped ancient hunter-gatherers store fat for survival during famine may contribute to diabetes in modern times of plenty.
But a new analysis of fossil feces from an Arizona cave suggests that the evolution of thrifty genes had little to do with famine and much more to do with the nature of the ancient feast. The research, reported in the August issue of Current Anthropology, shows that prehistoric hunter-gatherers in the Southwest lived on a diet remarkably high in fiber, low in fat, and consisting largely of foods with extremely low glycemic indices. That diet alone, the researchers say, could have been enough to fix fat-hoarding genes in place.
"What we're saying is we don't really need to look to feast or famine as a basis for thrifty genes," said Karl Reinhard, an archaeologist at the University of Nebraska-Lincoln and one the study's authors. Read more ..
The Edge of Space
Science in China Press
|Credit: Ann Feild, NASA/STScI|
Dark energy makes up about 70 percent of the current content of the Universe and thus holds the ultimate fate of our Universe. Several possible scenarios are possible depending on the properties of dark energy; one is that the Universe will end in a so-called big rip.
This interesting topic was recently explored by five researchers from the University of Science and Technology of China, the Institute of Theoretical Physics at the Chinese Academy of Sciences, Northeastern University, and Peking University. Their work, “Dark energy and fate of the Universe,” was published in Sci China-Phys Mech Astron.
For millennia, human beings have been pondering two ultimate questions: “Where do we come from?” and "Where are we going?” Over that time, these questions have spurred theological and philosophical debate. Thanks to the rapid development of modern cosmology in the past three decades, scientists nowadays have obtained some important clues to answer these questions. The standard “inflation plus hot big bang” framework has been developed to explain the origin of the Universe. However, to forecast the destiny of the Universe, researchers have realized that the nature of dark energy is key. Read more ..
The Way We Are
|Mary Beth O’Leary||July 24th 2012|
|Sheep equipped with GPS for flocking study (credit: Andrew King et al)|
Many animals spend time together in large groups not because they enjoy each other’s company, but rather because it lowers their own chances of being eaten should an uninvited guest arrive on the scene—or so the theory goes. Now, researchers who have strapped GPS-enabled backpacks to flocking sheep and a herding dog provide some of the first hard evidence that this “selfish herd theory” is true. The findings appear in the currennt issue of Current Biology, a Cell Press publication.
“We were able to track the movements of the sheep and the dog that pursued them on a second-by-second basis simultaneously,” said Andrew King of The Royal Veterinary College, University of London. “In each case, we found that the sheep exhibit a strong attraction towards the center of the flock as the dog approaches,” an effort to avoid the more dangerous fringe.
The selfish herd has long been a favorite explanation for grouping behavior, the researchers say. But tracking the concerted movements of many individual animals at once and predicting a predator’s attack is not easy to do. As a result, there had been little semblance of proof. Read more ..
The Geologic Edge
|Yivsam Azgad||July 24th 2012|
|Pyrite (fool’s gold) sample (credit: PNJ)|
As sulfur cycles through Earth’s atmosphere, oceans, and land, it undergoes chemical changes that are often coupled to changes in other such elements as carbon and oxygen. Although this affects the concentration of free oxygen, sulfur has traditionally been portrayed as a secondary factor in regulating atmospheric oxygen, with most of the heavy lifting done by carbon. However, new findings that appeared this week in Science suggest that sulfur’s role may have been underestimated.
Drs. Itay Halevy of the Weizmann Institute’s Environmental Science and Energy Research Department (Faculty of Chemistry), Shanan Peters of the University of Wisconsin and Woodward Fischer of the California Institute of Technology, were interested in better understanding the global sulfur cycle over the last 550 million years—roughly the period in which oxygen has been at its present atmospheric level of around 20 percent. They used a database developed and maintained by Peters at the University of Wisconsin, called Macrostrat, which contains detailed information on thousands of rock units in North America and beyond. Read more ..
The Edge of Space
|Caroline McCall||July 23rd 2012|
|Methane rivers and lakes on Titan via Cassini (credit: NASA/JPL/USGS)|
For many years, Titan’s thick, methane- and nitrogen-rich atmosphere kept astronomers from seeing what lies beneath. Saturn’s largest moon appeared through telescopes as a hazy orange orb, in contrast to other heavily cratered moons in the solar system.
In 2004, the Cassini-Huygens spacecraft—a probe that flies by Titan as it orbits Saturn—penetrated Titan’s haze, providing scientists with their first detailed images of the surface. Radar images revealed an icy terrain carved out over millions of years by rivers of liquid methane, similar to how rivers of water have etched into Earth’s rocky continents.
While images of Titan have revealed its present landscape, very little is known about its geologic past. Now researchers at MIT and the University of Tennessee at Knoxville have analyzed images of Titan’s river networks and determined that in some regions, rivers have created surprisingly little erosion. The researchers say there are two possible explanations: either erosion on Titan is extremely slow, or some other recent phenomena may have wiped out older riverbeds and landforms. A paper detailing the group’s findings will appear in the Journal of Geophysical Research–Planets. Read more ..
The Edge of Space
|Doug Rumble||July 23rd 2012|
|Johnstown meteorite showing diogenites (credit: Jon Taylor)|
In order to understand Earth’s earliest history—its formation from Solar System material to the present-day layering of metal core and mantle, and crust—scientists look to meteorites. New research from a team including Carnegie’s Doug Rumble and Liping Qin focuses on one particularly old type of meteorite called diogenites. These samples were examined using an array of techniques, including precise analysis of certain elements for important clues to some of the Solar System’s earliest chemical processing. Their work is published in July in Nature Geoscience.
At some point after terrestrial planets or large bodies accreted from surrounding Solar System material, they differentiated into a metallic core, asilicate mantle, and a crust. This involved a great deal of heating. The sources of this heat are the decay of short-lived radioisotopes; the energy conversion that occurs when dense metals are physically separated from lighter silicate; and the impact of large objects. Studies indicate that the Earth’s and Moon’s mantles may have formed more than 4.4 billion years ago, and Mars’s more than 4.5 billion years ago. Theoretically, when a planet or large body differentiates enough to form a core, certain elements including osmium, iridium, ruthenium, platinum, palladium, and rhenium—known as highly siderophile (iron-lovng) elements—are segregated into the core. Read more ..
The Water's Edge
|David Santen||July 23rd 2012|
Washington State University
A new study finds elevated levels of caffeine at several sites in Pacific Ocean waters off the coast of Oregon—though not necessarily where researchers expected. This study is the first to look at caffeine pollution off the Oregon coast. It was developed and conducted by Portland State University master's student Zoe Rodriguez del Rey and her faculty adviser Elise Granek, assistant professor of Environmental Science and Management, in collaboration with Steve Sylvester of Washington State University, Vancouver. In spring 2010, Rodriguez del Rey and Granek collected and analyzed samples from 14 coastal locations and seven adjacent water bodies as far north as Astoria, Ore., and as far south as Brookings.
Locations were identified as potentially polluted if they were near wastewater treatment plants, large population centers or rivers and streams emptying into the ocean. The study found high caffeine levels near Carl Washburne State Park (Florence, Ore.) and Cape Lookout, two areas not near the potential pollution sources, yet low levels of caffeine near large population centers like Astoria/Warrenton and Coos Bay. Read more ..
The Digital Edge
|David Salisbury||July 22nd 2012|
The amount of structural damage that radiation causes in electronic materials at the atomic level may be at least ten times greater than previously thought.
That is the surprising result of a new characterization method that uses a combination of lasers and acoustic waves to provide scientists with a capability tantamount to X-ray vision: It allows them to peer through solid materials to pinpoint the size and location of detects buried deep inside with unprecedented precision.
"The ability to accurately measure the defects in electronic materials becomes increasingly important as the size of microelectronic devices continues to shrink," Tolk explained. "When an individual transistor contains millions of atoms, it can absorb quite a bit of damage before it fails. But when a transistor contains a few thousand atoms, a single defect can cause it to stop working."
Previous methods used to study damage in electronic materials have been limited to looking at defects and deformations in the atomic lattice. The new method is the first that is capable of detecting disruption in the positions of the electrons that are attached to the atoms. This is particularly important because it is the behavior of the electrons that determine a material's electrical and optical properties. Read more ..
The Race for EVs
|Charles Murray||July 22nd 2012|
In the midst of the Tesla Model S rollout at the company's California manufacturing plant recently, Tesla CEO Elon Musk made a startling prediction: "In 20 years more than half of new cars manufactured will be fully electric," he said, according to a Reuters article. "I actually feel quite safe in that bet. That's a bet I will put money on."
That's a strong statement, but Musk apparently didn't think it was strong enough, so he quickly amended it. "It's probably going to be in the 12- to 15-year time frame," he added.
For those who closely follow the electric car business, that's a stunning prognostication, to put it kindly. Today, fully electric cars are few and their sales are poor. By 2020, Lux Research Inc. projects that "less than a percent" of new vehicles will be fully electric. Pike Research is slightly more charitable, saying they believe it could hit 1 percent. "If you look 10 years past 2020, is it going to gain another 49 percent?" asks Dave Hurst, senior analyst for Pike Research. "It's unlikely." Read more ..
The Geological Edge
|Claus Habfast||July 21st 2012|
European Synchrotron Radiation Facility
|Kīlauea, 1983 (credit: J.D. Griggs, USGS) |
Scientists have recreated the extreme conditions at the boundary between Earth’s core and its mantle, 2,900 km beneath the surface. Using the world’s most brilliant beam of X-rays, they probed speck-sized samples of rock at very high temperature and pressure to show for the first time that partially molten rock under these conditions is buoyant and should segregate towards the Earth’s surface. This observation is a strong evidence for the theory that volcanic hotspots like the Hawaiian Islands originate from mantle plumes generated at the Earth’s core-mantle boundary. The results were published in Nature on 19 July 2012.
The group of scientists was led by Denis Andrault from the Laboratoire Magmas et Volcans of University Blaise Pascal in Clermont, and included scientists from the CNRS in Clermont and the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. Most volcanoes are situated where continental plates are pushed or pulled against each other. Here, the continental crust is weakened, and the magma can break through to the surface. The Pacific “Ring of Fire,” for example, exhibits such plate movements, resulting in powerful earthquakes and numerous active volcanoes. Read more ..
Edge of Medicine
|Abigail Klein Leichman||July 21st 2012|
“Monoclonal antibodies” may sound like a great name for a heavy-metal band, but actually they’re the basis of best-selling pharmaceuticals raking in about $50 billion dollars a year.
The two-year-old Israeli company Immune Pharmaceuticals is fast emerging as a leader in developing new ways to use these antibodies, which are found in drugs such as Herceptin for breast cancer, Remicade to treat autoimmune diseases and Erbitux for head, neck and colorectal cancer.
“We are building an Israel-based Center of Excellence for Monoclonal Antibody Drug Development with access to best-in-class novel technologies from world-class academic institutions including the Hebrew University of Jerusalem and the Weizmann Institute of Science,” says founder and CEO Daniel Teper. “We expect to initiate collaborative research programs with biotech and pharmaceutical companies later this year.” Read more ..
The Edge of Nature
|Karin Kloosterman||July 20th 2012|
This past year’s erratic and violent weather is only a small taste of what’s to come, climate scientists predict, as the impact of global warming starts to hit. Weather will become more unpredictable, flooding will become even fiercer, and droughts and famine more widespread as land increasingly gives over to desert.
With desert covering a large part of its surface, Israel has had to quickly develop solutions for its lack of arable land and potable water. Israeli research, innovation, achievements and education on this topic now span the globe in tackling problems common to all desert dwellers.
“We’ve done a lot of research on ecosystem response to drought because we have this problem on our doorstep,” says Prof. Pedro Berliner, director of Israel’s foremost research center for desert research, the Jacob Blaustein Institute for Desert Research at Ben-Gurion University in the Negev Desert.
This article looks at Israel’s top 10 advances to combat desertification, putting special focus on the work done by researchers at the Blaustein Institute.
1. Looking to the ancients
They lived in the Land of Israel more than 2,000 years ago in the heart of the Negev Desert, yet found a way to survive and thrive. How did the Nabateans build a sustainable community that provided food, firewood and fodder for animals?
This is Prof. Pedro Berliner’s area of interest. He has developed a modern-day version of the Nabatean floodwater collection system, Runoff Agroforestry Systems, and travels the world teaching farmers in countries such as Kenya, Turkmenistan, Uzbekistan, India, and Mexico how to implement it. Read more ..
The Edge of Space
|Susan Hendrix||July 20th 2012|
|Two ways of visualizing data from solar observations|
(credit: NASA SDO and NASA/N. Viall)
A crucial, and often under-appreciated, facet of science lies in deciding how to turn the raw numbers of data into useful, understandable information—often through graphs and images. Such visualization techniques are needed for everything from making a map of planetary orbits based on nightly measurements of where they are in the sky to colorizing normally invisible light such as X-rays to produce “images” of the sun.
More information, of course, requires more complex visualizations and occasionally such images are not just informative, but beautiful too.
Such is the case with a new technique created by Nicholeen Viall, a solar scientist at NASA’s Goddard Space Flight Center in Greenbelt, Md. She creates images of the sun reminiscent of Van Gogh, with broad strokes of bright color splashed across a yellow background. But it’s science, not art. The color of each pixel contains a wealth of information about the 12-hour history of cooling and heating at that particular spot on the sun. That heat history holds clues to the mechanisms that drive the temperature and movements of the sun’s atmosphere, or corona.
A crucial, and often underappreciated, facet of science lies in deciding how to turn the raw numbers of data into useful, understandable information—often through graphs and images. Such visualization techniques are needed for everything from making a map of planetary orbits based on nightly measurements of where they are in the sky to colorizing normally invisible light such as X-rays to produce “images” of the sun. Read more ..
The Edge of Space
|Zenaida Kotala||July 18th 2012|
University of Central Florida
|Artist’s conception of small, hot exoplanet candidate UCF-1.01|
The University of Central Florida has detected what could be its first planet, only two-thirds the size of Earth and located right around the corner, cosmically speaking, at a mere 33 light-years away. The exoplanet candidate, called UCF 1.01, is close to its star—so close it goes around the star in 1.4 days. The planet’s surface likely reaches temperatures of more than 1,000° Fahrenheit. The discoverers believe that it has no atmosphere, is only two-thirds the gravity of Earth, and that its surface may be volcanic or molten.
“We have found strong evidence for a very small, very hot, and very close-by planet with the help of the Spitzer Space Telescope,” said Kevin Stevenson, a recent PhD graduate from the UCF and lead author of the paper, which is scheduled to appear online in The Astrophysical Journal. “This discovery is a significant accomplishment for UCF.”
Stevenson and his colleagues were studying a hot-Neptune exoplanet, designated GJ 436b, already known to exist around the red dwarf star GJ 436, when data revealed clues that led them to suspect there could be at least one new planet in that system, perhaps two. Read more ..
The Digital Edge
|Peter Clarke||July 18th 2012|
The French government is considering ways to tax Internet based companies that contrive to sell products and services in France without paying much to the government there by way of taxes, according to an Agence France-Presse (AFP) report. Google, Apple, Facebook and Amazon are being targeted the report quotes Yves Le Mouel, head of the French Telecommunications Federation (FFT), as saying. The GAFA quartet has annual sales of around five billion euros (about $6.1 billion) in France, the report said. It is an old question that first surfaced in the 1990s when the Internet first became popular and facilitated international sales. The idea of an internet tax was put to one side at that time because individual countries found it too difficult to address and were wary of the economic penalty of not developing as knowledge-based and Internet-enabled societies.
The French government has now launched a study due later this year that will again look at levies on Internet-based companies. Read more ..
The Edge of Healthcare
|Vanessa McMains||July 18th 2012|
Johns Hopkins Medical Institutions
Johns Hopkins tissue engineers have used tiny, artificial fiber scaffolds thousands of times smaller than a human hair to help coax stem cells into developing into cartilage, the shock-absorbing lining of elbows and knees that often wears thin from injury or age. Investigators can produce an important component of cartilage in both laboratory and animal models. While the findings are still years away from use in people, the researchers say the results hold promise for devising new techniques to help the millions who endure joint pain.
"Joint pain affects the quality of life of millions of people. Rather than just patching the problem with short-term fixes, like surgical procedures such as microfracture, we're building a temporary template that mimics the cartilage cell's natural environment, and taking advantage of nature's signals to biologically repair cartilage damage," says Jennifer Elisseeff, Ph.D., Jules Stein Professor of Ophthalmology and director of the Translational Tissue Engineering Center at the Johns Hopkins University School of Medicine. Read more ..
The Way We Are
|George Wigmore||July 17th 2012|
University College London
|During the last Ice Age, Beringia (top center) was above sea level, allowing|
migrations of fauna, flora, and humans between Alaska and Siberia
Scientists have found that Native American populations—from Canada to the southern tip of Chile—arose from at least three migrations, with the majority descended entirely from a single group of First American migrants that crossed over through Beringia, a land bridge between Asia and America that existed during the ice ages, more than 15,000 years ago.
By studying variations in Native American DNA sequences, the international team found that while most of the Native American populations arose from the first migration, two subsequent migrations also made important genetic contributions. The paper is published in the journal Nature.
“For years it has been contentious whether the settlement of the Americas occurred by means of a single or multiple migrations from Siberia,” said Professor Andres Ruiz-Linares (UCL Genetics, Evolution, and Environment), who coordinated the study. “But our research settles this debate: Native Americans do not stem from a single migration. Our study also begins to cast light on patterns of human dispersal within the Americas.” Read more ..
The Digital Edge
|Timothy Wall||July 16th 2012|
University of Missouri
Clogged printer nozzles waste time and money while reducing print quality. University of Missouri engineers recently invented a clog-preventing nozzle cover by mimicking the human eye.
“The nozzle cover we invented was inspired by the human eye,” said Jae Wan Kwon, associate professor in the College of Engineering. “The eye and an ink jet nozzle have a common problem: they must not be allowed to dry while, simultaneously, they must open. We used biomimicry, the imitation of nature, to solve human problems.”
Kwon’s invention uses a droplet of silicone oil to cover the opening of the nozzle when not in use, similar to the film of oil that keeps a thin layer of tears from evaporating off the eye. On the surface of the human eye, eyelids spread the film of oil over the layer of tears. However, at the tiny scale of the ink jet nozzle, mechanical shutters like eyelids would not work, as they would be stuck in place by surface tension. Instead, the droplet of oil for the nozzle is easily moved in and out of place by an electric field.
Kwon said this invention could make home and office printers less wasteful. To clear a clogged nozzle in most ink jet printers, a burst of fresh ink breaks through the crust of dried ink which forms if the machine isn’t used constantly. Over time this cleaning operation can waste a large amount of expensive ink. Kwon’s invention eliminates the need to waste that squirt of ink. Read more ..
The Edge of Physics
|Martin Barillas||July 16th 2012|
Cutting Edge Senior Correspondent
“Beam me up, Scotty. There’s no intelligent life here,” a line long attributed to the 1960s Star Trek series might soon become a reality as a “tractor beam” may harness the energy of light to move physical objects in space. It was already known that light indeed pushes on objects, even while it is a weak nudge. In the field of optical manipulation, for example, optical tweezers use the tractor force of light to push objects of microscopic size, ranging from atoms to bacteria. The ability to pull with light would increase the precision and scope of such manipulation. And for future spaceflight, scientists proffer the idea of space ships winging through space with sails that capture light as if it were a cosmic wind.
In a paper published in April 2012, scientists propose that rather than towing future spaceships, tractor beams might be better used in biology and medicine. If you want to pull something towards you, you just reduce the pressure," says Mordechai Segev, a physicist at Technion–Israel Institute of Technology, who described the idea in an Optics Express paper. "You make a little bit of vacuum," he adds. The problem is that in sensitive medical applications, such as lung surgery, it is important not to change the pressure or introduce any new gases. "Here, the light will be the suction device," he says, "so the pressure would not change at all. It is just the light." Read more ..
The Medical Edge
|NCI Press Office||July 15th 2012|
NIH/National Cancer Institute
A new study details how a suite of web-based tools provides the research community with greatly improved capacity to compare data derived from large collections of genomic information against thousands of drugs. By comparing drugs and genetic targets, researchers can more easily identify pharmaceuticals that could be effective against different forms of cancer.
The newly updated software, called CellMiner, was built for use with the NCI-60, one of the most widely utilized collections of cancer cell samples employed in the testing of potential anti-cancer drugs. The tools, available free, provide rapid access to data from 22,379 genes catalogued in the NCI-60 and from 20,503 previously analyzed chemical compounds, including 102 U.S. Food and Drug Administration-approved drugs.
The study is written by the scientists that developed the tools at the National Cancer Institute (NCI), part of the National Institutes of Health. "Previously you would have to hire a bioinformatics team to sort through all of the data, but these tools put the entire database at the fingertips of any researcher," explained Yves Pommier, M.D., Ph.D., of the NCI's Center for Cancer Research. "These tools allow researchers to analyze drug responses as well as make comparisons from drug to drug and gene to gene." Read more ..
The Edge of Nature
|Phil Mercer||July 15th 2012|
A document signed by more than 2,500 scientists at the International Coral Reef Symposium in Cairns, Australia said that climate change is a greater threat to coral reefs than pollution and overfishing. Marine scientists are also warning that the Great Barrier Reef off the coast of Australia's Queensland state will degenerate if the oceans continue to acidify.
The repeated warning from delegates is that manmade climate change is posing a serious risk to coral expanses across the planet. Marine scientists say other factors, such as pollution and increased shipping, also present risks.
The head of the U.S. National Oceanographic and Atmospheric Administration, Dr. Jane Lubchenco, said Australia’s Great Barrier Reef is facing particular threats.
“The Great Barrier Reef is a obviously spectacular place and thanks to the Great Barrier Reef Marine Park Authority, it has been relatively well managed. It's really a model that has been emulated elsewhere," said Lubchenco. "Part of what makes a healthy reef is not only paying attention to activities on the water and under the water, but land, what's happening on the land, and how much sedimentation, how much pollution is washing into the reef and of course that's an ongoing concern for the Great Barrier Reef.” Read more ..
The Edge on Medicine
|Bonnie Ward||July 15th 2012|
La Jolla Institute for Allergy and Immunology
Despite ongoing public health efforts, E. coli outbreaks continue to infiltrate the food supply, annually causing significant sickness and death throughout the world. But the research community is gaining ground. In a major finding, published today in the scientific journal Nature, researchers from the La Jolla Institute for Allergy & Immunology have discovered a molecule's previously unknown role in fighting off E. coli and other bacterial infections, a discovery that could lead to new ways to protect people from these dangerous microorganisms.
"We've found that a certain molecule, known as HVEM, expressed by the cells lining the surface of the lung and intestine, is critical to protecting the body from E. coli, pneumococcus and other bacterial infections that enter our bodies through the lining of our respiratory or intestinal tracts," said Mitchell Kronenberg, Ph.D., La Jolla Institute's president and chief scientific officer, who led the research team. "We discovered that HVEM acts in these cells like a border guard that responds to the presence of invasive bacteria and signals the immune system to send in more troops. Without its involvement as part of the epithelial protective barrier, the body could be overrun by certain disease causing bacteria," said Dr. Kronenberg, adding that he is hopeful the discovery will advance efforts toward developing new treatments or vaccines against bacterial infections. Read more ..
The Race for EVs
|Tobias Kappels||July 14th 2012|
Heat can damage the batteries of electric vehicles – even just driving fast on the freeway in summer temperatures can overheat the battery. An innovative new coolant conducts heat away from the battery three times more effectively than water, keeping the battery temperature within an acceptable range even in extreme driving situations.
Batteries provide the “fuel” that drives electric cars – in effect, the vehicles’ lifeblood. If batteries are to have a long service life, overheating must be avoided. A battery’s “comfort zone” lies between 20°C and 35°C. But even a Sunday drive in the midday heat of summer can push a battery’s temperature well beyond that range. The damage caused can be serious: operating a battery at a temperature of 45°C instead of 35°C halves its service life. And batteries are expensive – a new one can cost as much as half the price of the entire vehicle. Read more ..
The Automotive Edge
|Jennifer Chu||July 13th 2012|
Barrels and cones dot an open field in Saline, Mich., forming an obstacle course for a modified vehicle. A driver remotely steers the vehicle through the course from a nearby location as a researcher looks on. Occasionally, the researcher instructs the driver to keep the wheel straight — a trajectory that appears to put the vehicle on a collision course with a barrel. Despite the driver’s actions, the vehicle steers itself around the obstacle, transitioning control back to the driver once the danger has passed.
The key to the maneuver is a new semiautonomous safety system developed by Sterling Anderson, a PhD student in MIT’s Department of Mechanical Engineering, and Karl Iagnemma, a principal research scientist in MIT’s Robotic Mobility Group.
The system uses an onboard camera and laser rangefinder to identify hazards in a vehicle’s environment. The team devised an algorithm to analyze the data and identify safe zones — avoiding, for example, barrels in a field, or other cars on a roadway. The system allows a driver to control the vehicle, only taking the wheel when the driver is about to exit a safe zone. Read more ..
The Edge of Space
|Andrea Boyle Tippett||July 12th 2012|
University of Delaware
Now, researchers from the U.S. and South Korea have developed a warning system capable of forecasting the radiation from these violent solar storms nearly three hours (166 minutes) in advance, giving astronauts, as well as air crews flying over Earth’s polar regions, time to take protective action.
Physicists from the University of Delaware and from Chungnam National University and Hanyang University developed the system and report on it in Space Weather. Prof. John Bieber at UD’s Bartol Research Institute, based in the Department of Physics and Astronomy, directed the scientific project. The article’s lead author is Su Yeon Oh, a postdoctoral researcher from Chungnam National University, who worked with Bieber on the project at UD. “Traveling nearly at the speed of light, it takes just 10 minutes for the first particles ejected from a solar storm to reach Earth,” Bieber says. These sun storms can cover thousands of miles on the sun, like a wave of exploding hydrogen bombs. Read more ..
The Race for Alt Fuel
|Michael Bernstein||July 11th 2012|
American Chemical Society
Scientists are reporting new evidence that a white rot fungus shows promise in the search for a way to use waste corn stalks, cobs and leaves – rather than corn itself – to produce ethanol to extend supplies of gasoline. Their study on using the fungus to break down the tough cellulose and related material in this so-called "corn stover" to free up sugars for ethanol fermentation appears in the ACS' journal Industrial & Engineering Chemistry Research.
Yebo Li and colleagues explain that corn ethanol supplies are facing a crunch because corn is critical for animal feed and food. They note that the need for new sources of ethanol has shifted attention to using stover, which is the most abundant agricultural residue in the U.S., estimated at 170-256 million tons per year. The challenge is to find a way to break down tough cellulose material in cobs, stalks and leaves – so that sugars inside can be fermented to ethanol. Read more ..
The Edge of Space
|Richard Hook||July 11th 2012|
European Southern Obervatory
|Region of the sky surrounding the quasar HE0109-3518|
(credit: ESO; Digitized Sky Survey 2; S. Cantalupo, UC Santa Cruz)
Dark galaxies are small, gas-rich galaxies in the early Universe that are very inefficient at forming stars. They are predicted by theories of galaxy formation and are thought to be the building blocks of today’s bright, star-filled galaxies. Astronomers think that they may have fed large galaxies with much of the gas that later formed into the stars that exist today.
Because they are essentially devoid of stars, these dark galaxies don’t emit much light, making them very hard to detect. For years astronomers have been trying to develop new techniques that could confirm the existence of these galaxies. Small absorption dips in the spectra of background sources of light have hinted at their existence. However, this new study marks the first time that such objects have been seen directly.
“Our approach to the problem of detecting a dark galaxy was simply to shine a bright light on it.” explains Simon Lilly (ETH Zurich, Switzerland), co-author of the paper. “We searched for the fluorescent glow of the gas in dark galaxies when they are illuminated by the ultraviolet light from a nearby and very bright quasar. The light from the quasar makes the dark galaxies light up in a process similar to how white clothes are illuminated by ultraviolet lamps in a night club.” Fluorescence is defined as the emission of light by a substance illuminated by a light source. In most cases, the emitted light has longer wavelength than the source light. For instance, fluorescent lamps transform ultraviolet radiation—invisible to us—into optical light. Read more ..
The Edge of Healthcare
|Michael Kennedy||July 11th 2012|
University of Toronto
Two powerful brain chemical systems work together to paralyze skeletal muscles during rapid eye movement (REM) sleep. The finding may help scientists better understand and treat sleep disorders, including narcolepsy, tooth grinding, and REM sleep behavior disorder.
During REM sleep — the deep sleep where most recalled dreams occur — your eyes continue to move but the rest of the body’s muscles are stopped, potentially to prevent injury. In a series of experiments, University of Toronto neuroscientists Patricia L. Brooks and John H. Peever, PhD, found that the neurotransmitters gamma-aminobutyric acid (GABA) and glycine caused REM sleep paralysis in rats by “switching off” the specialized cells in the brain that allow muscles to be active. This finding reversed earlier beliefs that glycine was a lone inhibitor of these motor neurons.
“The study’s findings are relevant to anyone who has ever watched a sleeping pet twitch, gotten kicked by a bed partner, or has known someone with the sleep disorder narcolepsy,” said Dennis J. McGinty, PhD, a behavioral neuroscientist and sleep researcher at the University of California, Los Angeles, who was not involved in the study. Read more ..
The Edge of Space
|Stuart Wolpert||July 10th 2012|
|Artist's conception of a planet-forming disk similar to the one around|
TYC 8241 2652—which vanished. (Credit: NASA JPL/CalTech)
Astronomers report a baffling discovery never seen before: An extraordinary amount of dust around a nearby star has mysteriously disappeared.
“It’s like the classic magician’s trick—now you see it, now you don't,” said Carl Melis, a postdoctoral scholar at UC San Diego and lead author of the research. “Only in this case, we're talking about enough dust to fill an inner solar system, and it really is gone!”
“It's as if the rings around Saturn had disappeared,” said co-author Benjamin Zuckerman, a UCLA professor of physics and astronomy. “This is even more shocking because the dusty disc of rocky debris was bigger and much more massive than Saturn's rings. The disc around this star, if it were in our solar system, would have extended from the sun halfway out to Earth, near the orbit of Mercury.”
The research on this cosmic vanishing act, which occurred around a star some 450 light years from Earth, in the direction of the constellation Centaurus, appeared in July the journal Nature. Read more ..
The Edge of Healthcare
|Sara Wahlberg||July 9th 2012|
“Our memories are basically who we are,” says Dr. Nachum Ulanovsky of the Department of Neurobiology at the Weizmann Institute of Science. “I suspect that this is why people are so afraid of the various memory dysfunctions—because if you lose your memory then, in some way, you lose your identity and personality.”
Dr. Ulanovsky investigates memory using an unconventional subject: bats. In addition to shedding light on the basic function of the memory system, his work could lead to new understanding of a range of neurological conditions. “There are dozens and dozens of disorders of the brain,” he says, “and these are some of the most difficult medical problems to tackle.”
Bats, which navigate freely and precisely, are well-suited to memory research because they have outstanding memory capabilities, including spatial memory. They also have a brain structure that is remarkably similar to our own, including the hippocampus, which plays a major role in episodic and spatial memory. “The hippocampus is an ancient structure,” says Dr. Ulanovsky. “It developed long ago, and so is anatomically very similar across all mammals, including bats and humans.” Read more ..
The Edge of Healthcare
|Marjorie Montemayer-Quellenberg||July 8th 2012|
Brigham and Women's Hospital
Researchers from Brigham and Women's Hospital (BWH) have made a groundbreaking discovery that will shape the future of melanoma therapy. The team, led by Thomas S. Kupper, MD, chair of the BWH Department of Dermatology, and Rahul Purwar, PhD, found that high expression of a cell-signaling molecule, known as interleukin-9, in immune cells inhibits melanoma growth.
After observing mice without genes responsible for development of an immune cell called T helper cell 17 (TH17), researchers found that these mice had significant resistance to melanoma tumor growth, suggesting that blockade of the TH17 cell pathway favored tumor inhibition. The researchers also noticed that the mice expressed high amounts of interleukin-9. "These were unexpected results, which led us to examine a possible contribution of interleukin-9 to cancer growth suppression." said Purwar. Read more ..
The Medical Edge
University of Washington
Comparing the DNA from patients at the best and worst extremes of a health condition can reveal genes for resistance and susceptibly. This approach discovered rare variations in the DCTN4 gene among cystic fibrosis patients most prone to early, chronic airway infections.
The DCTN4 gene codes for dynactin 4. This protein is a component of a molecular motor that moves trouble-making microbes along a cellular conveyer belt into miniscule chemical vats, called lysosomes, for annihilation.
This study, led by the University of Washington, is part of the National Heart Lung and Blood Institute GO Exome Sequencing Project and its Lung GO, both major National Institutes of Health chronic disease research efforts. Similar "testing the extremes" strategies may have important applications in uncovering genetic factors behind other more common, traits, such as healthy and unhealthy hearts. Read more ..
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