The Edge of Nature
|Elisabeth Lyons||September 24th 2012|
Humans' superior brain size in comparison to their chimpanzee cousins traces all the way back to the womb. That's according to a study reported in the September 25 issue of Current Biology
, a Cell Press
publication, that is the first to track and compare brain growth in chimpanzee and human fetuses.
"Nobody knew how early these differences between human and chimp brains emerged," said Satoshi Hirata of Kyoto University.
Hirata and colleagues Tomoko Sakai and Hideko Takeshita now find that human and chimp brains begin to show remarkable differences very early in life. In both primate species, the brain grows increasingly fast in the womb initially. After 22 weeks of gestation, brain growth in chimpanzees starts to level off, while that of humans continues to accelerate for another two months or more. (Human gestation time is only slightly longer than that of chimpanzees, 38 weeks versus 33 or 34 weeks.) Read more ..
The Defense Edge
|Daniel Parry||September 24th 2012|
U.S. Naval Research Laboratory
Refueling U.S. Navy vessels, at sea and underway, is a costly endeavor in terms of logistics, time, fiscal constraints and threats to national security and sailors at sea.
In Fiscal Year 2011, the U.S. Navy Military Sea Lift Command, the primary supplier of fuel and oil to the U.S. Navy fleet, delivered nearly 600 million gallons of fuel to Navy vessels underway, operating 15 fleet replenishment oilers around the globe.
From Seawater to CO2
Scientists at the U.S. Naval Research Laboratory are developing a process to extract carbon dioxide (CO2) and produce hydrogen gas (H2) from seawater, subsequently catalytically converting the CO2 and H2 into jet fuel by a gas-to-liquids process. Read more ..
The Edge of Medicine
|Timothy Wall||September 24th 2012|
University of Missouri
Infectious bacteria received a taste of their own medicine from University of Missouri researchers who used viruses to infect and kill colonies of Pseudomonas aeruginosa, common disease-causing bacteria. The viruses, known as bacteriophages, could be used to efficiently sanitize water treatment facilities and may aid in the fight against deadly antibiotic-resistant bacteria.
“Our experiment was the first to use bacteriophages in conjunction with chlorine to destroy biofilms, which are layers of bacteria growing on a solid surface,” said Zhiqiang Hu, associate professor of civil and environmental engineering in MU’s College of Engineering. “The advantage to using viruses is that they can selectively kill harmful bacteria. Beneficial bacteria, such as those used to break down wastes in water treatment plants, are largely unaffected. Hence, viruses could be used to get rid of pathogenic bacteria in water filters that would otherwise have to be replaced. They could save taxpayers’ money by reducing the cost of cleaning water.” Read more ..
The Edge of the Universe
|Kevin Mayhood||September 23rd 2012|
Case Western Reserve University
|Five quasar gravitational lens|
(credt K. Sharon, Tel Aviv U; E. Ofek, Caltech; ESA; NASA)
Scientists can’t travel deep space the way Columbus sailed and charted the New World or Lewis and Clark mapped the west. But, researchers at Case Western Reserve University and two partnering institutions have found a possible way to map the spread and structure of the universe, guided by the light of quasars.
The technique, combined with the expected discovery of millions more far-away quasars over the next decade, could yield an unprecedented look back to a time shortly after the Big Bang, when the universe was a fraction the size it is today.
Researchers found the key while analyzing the visible light from a small group of quasars. Patterns of light variation over time were consistent from one quasar to another when corrected for the quasar’s redshift. This redshift occurs because an expanding universe carries the quasars away from us, thus making the light from them appear redder (hence the term), and also making the time variations appear to occur more slowly. Read more ..
The Edge of Medicine
|Abigail Klein Leichman||September 23rd 2012|
Could MDwave represent the trend of the future for treating everything from ADHD to heart disease without drugs? The same Israeli inventor who brought the world pre-paid phone cards and voice over Internet protocol (VOIP) also had an idea for a portable medical device that could confer the healing properties of low electromagnetic frequencies.
Nearly a decade after its conception, MDwave is now inching closer to the marketplace. Based on technology developed by Israel Defense Prize winner Tzvi Kamil, the late head of the Israeli Nuclear Safety Commission, the device is made by the Holon-based company Aerotel.
Aerotel’s chief scientist Mickey Scheinowitz explains that the small, user-friendly device can treat acute and chronic health conditions including heart disease, migraines, joint pain, gastrointestinal problems and muscle pain by producing a delicate electromagnetic field that restores balanced function to abnormal body cells. “Magnetic ﬁelds have been used for more than 20 years in medicine, such as for skin lesions, and were shown to improve the healing of bone fractures,” he and colleagues wrote in a scholarly article on the topic in Annals of Biomedical Engineering. Read more ..
The Edge of Climate Change
|Peter Fednysky||September 23rd 2012|
The extent of Arctic sea ice this week shrunk to a new low in the era of satellite record-keeping that began in 1979. The increased expanse of water near the top of the world could have implications for global shipping, wildlife and even international diplomacy. Polar bears hunt seals from sea ice, but could drown if forced to swim long distances in open water. Satellite photos released by America’s space agency, NASA, illustrate the daunting threat to such bears. An image shows the amount of Arctic Sea ice in 1979.
Another shows the record minimum set this year on September 16. The shrinkage is equivalent to an area greater than Texas, an impossible distance for even the mightiest polar bear to swim. Scientists say fossil fuels are increasing carbon emissions in the atmosphere. This not only warms the oceans, but threatens biodiversity in cold and warm waters alike. Read more ..
The Edge of Health
|Emily Walker||September 22nd 2012|
New research offers hope to women whose fertility has been compromised by the side-effects of cancer therapy or by premature menopause. A study published today found that two proteins, PUMA and NOXA, cause the death of egg cells in the ovaries. Blocking the activity of the proteins may lead to new strategies to protect women's fertility. The team, including Associate Professor Jeffrey Kerr from Monash, Associate Professor Clare Scott, Dr Ewa Michalak and Professor Andreas Strasser from WEHI and Dr Karla Hutt and Professor Jock Findlay from PHI, focused their studies on egg cells called primordial follicle oocytes, which provide each woman's lifetime supply of eggs. Low numbers of these egg cells can also cause early menopause. Read more ..
The Edge of Medicine
|Hilary Glove||September 22nd 2012|
Lithium is a 'gold standard' drug for treating bipolar disorder, however not everyone responds in the same way. New research finds that this is true at the levels of gene activation, especially in the activation or repression of genes which alter the level the apoptosis (programmed cell death). Most notably BCL2, known to be important for the therapeutic effects of lithium, did not increase in non-responders. This can be tested in the blood of patients within four weeks of treatment.
A research team from Yale University School of Medicine measured the changing levels of gene activity in the blood of twenty depressed adult subjects with bipolar disorder before treatment, and then fortnightly once treatment with lithium carbonate had begun. Over the eight weeks of treatment there were definite differences in the levels of gene expression between those who responded to lithium (measured using the Hamilton Depression Rating Scale) and those who failed to respond. Dr Robert Beech who led this study explained, "We found 127 genes that had different patterns of activity (turned up or down) and the most affected cellular signalling pathway was that controlled programmed cell death (apoptosis)." For people who responded to lithium the genes which protect against apoptosis, including Bcl2 and IRS2, were up regulated, while those which promote apoptosis were down regulated, including BAD and BAK1. Read more ..
The Edge of Medicine
|Allison Kermode and Marianne Meadahi||September 22nd 2012|
Simon Fraser University
The seeds of greenhouse-grown corn could hold the key to treating a rare, life-threatening childhood genetic disease, according to researchers from Simon Fraser University. SFU biologist Allison Kermode and her team have been carrying out multidisciplinary research toward developing enzyme therapeutics for lysosomal storage diseases - rare, but devastating childhood genetic diseases – for more than a decade.
In the most severe forms of these inherited diseases, untreated patients die in early childhood because of progressive damage to all organs of the body. Currently, enzyme treatments are available for only six of the more than 70 diverse types of lysosomal storage diseases.
“In part because mammalian cell cultures have been the system of choice to produce these therapeutics, the enzymes are extremely costly to make, with treatments typically ranging from $300,000 to $500,000 per year for children, with even higher costs for adults,” says Kermode, noting the strain on healthcare budgets in Canada and other countries is becoming an issue. Read more ..
The Digital Edge
|Karin Kloosterman||September 21st 2012|
A new Israeli cloud-based company helps brokers and traders make better stock-market trading decisions in real time. The ups and downs of the stock market look random and chaotic when observed from the outside, but some brokers do make lots of money for themselves and their clients. Are they lucky, business gurus, or just good at risky business? A new Israeli company is working to give you and your portfolio the answer.
CPattern is a new cloud-based analytics technology that helps brokers and traders make better stock-market trading decisions in real time. It collects information on the buying and selling behavior of traders worldwide to analyze what works and what doesn’t. The multilingual solution is tailored to suit online brokers, who can then alert and advise home traders looking to invest wisely in the global stock market. “We are taking online brokers from the Stone Age to the 21st century,” says Oded Shefer, the CEO and co-founder of CPattern. “We give online brokers and home traders high-resolution data when they need it.” Read more ..
The Race for LEDs
|Brian Nitz||September 18th 2012|
Professor Abraham Haim, an authority on the biological effects of light pollution, presented his findings last week at the International Congress of Zoology (ICZ) in Haifa Israel. World experts discussed, “Light Pollution and its Ecophysiological Consequences” and came to a consensus that light pollution does have health consequences.
Professor Haim’s team studied the effect of night light on blind mole rats and seeing rats. He presented his research findings indicating that the biological effects of nocturnal lights included damage to metabolic rates, body mass, oxygen consumption and the level of certain hormones including melatonin– which is known to impact sleep cycles and mood and is believed to suppress some cancers and tumors. Studies seemed to indicate that the short-wavelength blueish light emitted by Light Emitting Diodes (LEDs) has an especially strong effect. Ever since humans brought light into their homes in the form of candles and oil lamps, we’ve considered artificial lights to be a positive influence in our lives. World religions reinforced this belief with the miracles of menorahs, eternal flames and the light of the world. Up through the invention of incandescent bulbs indoor lights had a color which was warmer (redder) than natural sunlight. This changed somewhat with the advent of greenish florescent lights. But a more dramatic change came very recently with the invention of efficient white light Light Emitting Diodes (LEDs). Read more ..
The Edge of Space
|Rick Pantaleo||September 18th 2012|
|Artist's conception: First stars forming after Big Bang (credit: NASA)|
Since they can’t turn back time to witness the creation of the universe almost 14 billion years ago, scientists are working on the next best thing: creating a virtual universe, starting at the beginning with the Big Bang.
With the help of the world’s third-fastest computer, physicists from the US Department of Energy’s Argonne National Laboratory are developing simulations that will take them on a trip from the origins of the universe until today.
Over the years, scientists have scanned the night skies with telescopes which produced maps of the universe. With the advances in astronomical technology, more details about the cosmos have emerged from these surveys. Taking data from the best sky surveys and running it through Argonne’s Mira Supercomputer, the team plans to produce some of the largest high-resolution simulations of the distribution of matter in the universe. Given the improvements in technology, Salman Habib, one of the project leaders, says it makes sense to try to understand the universe on the biggest possible scale. Read more ..
The Edge of Space
|David A. Aguilar||September 17th 2012|
Harvard-Smithsonian Center for Astrophysics
At first glance, the center of the Milky Way seems like a very inhospitable place to try to form a planet. Stars crowd each other as they whiz through space like cars on a rush-hour freeway. Supernova explosions blast out shock waves and bathe the region in intense radiation. Powerful gravitational forces from a supermassive black hole twist and warp the fabric of space itself.
Yet new research by astronomers at the Harvard-Smithsonian Center for Astrophysics shows that planets still can form in this cosmic maelstrom. For proof, they point to the recent discovery of a cloud of hydrogen and helium plunging toward the galactic center. They argue that this cloud represents the shredded remains of a planet-forming disk orbiting an unseen star. "This unfortunate star got tossed toward the central black hole. Now it's on the ride of its life, and while it will survive the encounter, its protoplanetary disk won't be so lucky," said lead author Ruth Murray-Clay of the CfA. Read more ..
The Edge of Health
|Joe DeCapua||September 15th 2012|
Traditional vaccine methods have been unsuccessful in preventing infection by HIV, the virus that causes AIDS. New techniques are being studied to boost antibodies or other parts of the immune system. But researchers are also working on a method to keep the immune system constantly on guard against HIV.
There are two traditional methods for creating a vaccine. One uses a weakened or attenuated version of a live virus to generate an immune response. The other uses a dead virus. Both methods are proven safe and effective, except when it comes to HIV. Vaccine candidates using these methods simply have not been successful in people when it comes to the AIDS virus.
“HIV has been a very difficult target for a vaccine for a variety of reasons. It’s designed to evade the immune response by evolution,” said Dr. Louis Picker, associate director of Oregon Health and Science University. While attempts to make an HIV vaccine from a dead virus have failed, Picker said, using a weakened virus holds clues and possibilities when used in primates. Read more ..
The Edge of Climate Change
|Jim Erickson||September 13th 2012|
Climate change is expected to increase the frequency of intense spring rain storms in the Great Lakes region throughout this century and will likely add to the number of harmful algal blooms and "dead zones" in Lake Erie, unless additional conservation actions are taken, according to a University of Michigan aquatic ecologist.
Climate models suggest that the number of intense spring rain storms in the region could double by the end of the century, contributing to an overall 30 to 40 percent increase in spring precipitation, said Donald Scavia, director of the U-M's Graham Sustainability Institute.
That increase, combined with the greater availability of phosphorous due to current agricultural practices in the Midwest, means that increased amounts of the nutrient will be scoured from farmlands and run into rivers that feed Lake Erie, fueling algae blooms and low-oxygen zones known as dead zones. "Climate change is likely to make reducing phosphorous loads even more difficult in the future than it is now, which will likely lead to even more toxic algae blooms and larger dead zones unless more conservation is undertaken," said Scavia, who presented his latest findings on the topic during Great Lakes Week events in Cleveland. Scavia was a panel member in a session entitled "Addressing nutrient problems in the Great Lakes," at the Great Lakes Week Joint Session meeting. Read more ..
The Graphene Edge
|Dylan McGrath||September 13th 2012|
A group of researchers from the Norwegian University of Science and Technology (NTNU) have patented and are commercializing a technology for growing gallium arsenide (GaAs) nanowires on graphene, a breakthrough that could help pave the way for flexible, self-powered electronics integrated into everything from clothing to notepads.
Researchers believe that semiconductors grown on graphene will eventually form the basis for new types of devices and could fundamentally change the semiconductor industry.
NTNU's patented hybrid material offers excellent optoelectronic properties, according to Helge Weman, a professor at NTNU's department of electronics and telecommunications. "We have managed to combine low cost, transparency and flexibility in our new electrode," said Weman, who is also a co-founder and chief technology officer of the company created to commercialize the research, CrayoNano AS. Read more ..
Edge of Space
|Richard Hook ||September 13th 2012|
European Southern Observatory
The Pencil Nebula is pictured in a new image from European Southern Observatory's La Silla Observatory in Chile. This peculiar cloud of glowing gas is part of a huge ring of wreckage left over after a supernova explosion that took place about 11 000 years ago. This detailed view was produced by the Wide Field Imager on the MPG/ESO 2.2-metre telescope.
Despite the tranquil and apparently unchanging beauty of a starry night, the Universe is far from being a quiet place. Stars are being born and dying in an endless cycle, and sometimes the death of a star can create a vista of unequalled beauty as material is blasted out into space to form strange structures in the sky.
This new image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESO's La Silla Observatory in Chile shows the Pencil Nebula against a rich starry background. This oddly shaped cloud, which is also known as NGC 2736, is a small part of a supernova remnant in the southern constellation of Vela (The Sails). These glowing filaments were created by the violent death of a star that took place about 11 000 years ago. The brightest part resembles a pencil; hence the name, but the whole structure looks rather more like a traditional witch's broom. Read more ..
The Nano Edge
|Erin White||September 12th 2012|
When mercury is dumped into rivers and lakes, the toxic heavy metal can end up in the fish we eat and the water we drink. To help protect consumers from the diseases and conditions associated with mercury, researchers at Northwestern University in collaboration with colleagues at Ecole Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, have developed a nanoparticle system that is sensitive enough to detect even the smallest levels of heavy metals in our water and fish.
“The system currently being used to test for mercury and its very toxic derivative, methyl mercury, is a time-intensive process that costs millions of dollars and can only detect quantities at already toxic levels,” said Bartosz Grzybowski, lead author of the study. “Ours can detect very small amounts, over million times smaller than the state-of-the-art current methods. This is important because if you drink polluted water with low levels of mercury every day, it could add up and possibly lead to diseases later on. With this system consumers would one day have the ability to test their home tap water for toxic metals.” Read more ..
The Digital Edge
|Julien Happich||September 10th 2012|
A total of 500 million personal cloud storage subscriptions are expected this year, up from less than 300 million in 2011, according to insights from the IHS iSuppli Mobile and Wireless Communications Service at information and analytics provider IHS.
The subscriptions are expected to jump to 625 million next year, a solid increase of 25 percent, with uninterrupted double-digit growth anticipated to follow until at least 2017. During that year, subscriptions to cloud storage are projected to hit 1.3 billion, as presented in the figure attached.
“In an environment where mobile devices like smartphones and media tablets handle broadband data on a near-ceaseless basis, businesses are realizing the importance of cloud services in allowing consumers to manage, store and sync content across their devices,” said Jagdish Rebello, Ph.D., director for consumer & communications at IHS. Read more ..
The Edge of Climate Change
|Kate Ramsayer||September 10th 2012|
American Geophysical Union
For the past four decades, scientists have monitored the ebbs and flows of the icefields in the southernmost stretch of South America’s vast Andes Mountains, detecting an overall loss of ice as the climate warms. A new study, however, finds that the rate of glacier thinning has increased by about half over the last dozen years in the Southern Patagonian Icefield, compared to the 30 years prior to 2000.
“Patagonia is kind of a poster child for rapidly changing glacier systems,” said Michael Willis, lead author of the study and a research associate at Cornell University in Ithaca, New York. “We are characterizing a region that is supplying water to sea level at a big rate, compared to its size.” The Southern Patagonian Icefield together with its smaller northern neighbor, the Northern Patagonian Icefield, are the largest icefields in the southern hemisphere—excluding Antarctica. The new study shows that the icefields are losing ice faster since the turn of the century and contributing more to sea level rise than ever before.
Earlier studies determined that between the 1970s and 2000, both icefields, which feed into surrounding oceans as they melt, together raised global sea levels by an average of .042 millimeters each year. Willis and his colleagues found that since 2001, that number increased to 0.067 mm of sea level rise on average per year—about two percent of total annual sea level rise since 1998. Read more ..
The Edge of Music
|Barbara Batchtler||September 9th 2012|
A good violin depends not only on the expertise of the violin maker, but also on the quality of the wood that is used. The Swiss wood researcher Professor Francis W. M. R. Schwarze (Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland) has succeeded in modifying the wood for a violin through treatment with special fungi. This treatment alters the acoustic properties of the instrument, making it sound indistinguishably similar to a Stradivarius.
In his dinner talk at the 1st ECRC "Franz-Volhard" Symposium of the Max Delbrück Center for Molecular Medicine (MDC) and Charité - Universitätsmedizin in Berlin-Buch, Schwarze reported on his research and gave a preview of what his wood treatment method could mean, particularly for young violinists. Read more ..
The Edge of Physics
|Florian Aigner||September 9th 2012|
Every day we observe systems thermalizing: Ice cubes in a pot of hot water will melt and will never remain stable. The molecules of the ice and the molecules of the water will reach thermal equilibrium, ending up at the same temperature. Well-ordered ice crystals turn into a disordered liquid. Experiments at the Vienna Center for Quantum Science and Technology (VCQ) at the Vienna University of Technology have shown that in the quantum world the transition to thermal equilibrium is more interesting and more complicated than assumed so far.
Between an ordered initial state and a statistically mixed final state, a so-called "quasi-stationary intermediate state" can emerge. This intermediate state already exhibits some equilibrium like properties, but some of the distinct order of the initial state remains visible for a remarkably long time.
This phenomenon is called "pre-thermalization". Pre-thermalization is predicted to play a major role in many different non-equilibrium processes in quantum physics. It could, for example, help us to understand the state of the early universe.
Ultracold Atom Clouds
"In our experiments we start with a one-dimensional quantum gas of ultracold atoms, a so-called Bose-Einstein condensate, which is then rapidly split into two using an atomchip", Professor Jörg Schmiedmayer (Vienna University of Technology) explains. When the two parts of the condensate are immediately rejoined, they create an ordered matter-wave interference pattern. "The shape of this interference pattern shows us that the two clouds have not yet forgotten that they originally came from the same atom cloud", says Jörg Schmiedmayer. Read more ..
The Edge of Sport
|Selah Hennessy||September 8th 2012|
The spotlight at the Paralympic Games in London has not been on the athletes alone but also on the remarkable technology that helps them compete. In London, engineers, volunteering for a charity called Remap, are developing Olympic technology right in their own backyard.
In the garage of his home just outside London, David Sheffield is working on the prototype for a wheelchair suitable for Paralympic athletes. Working with him is former engineer Doug Watt. They are among some 1,000 people who volunteer for the charity Remap, designing technology that helps disabled people. They do it in their own garages, for free, and usually using their own materials. The wheelchair they are working on now is designed to fit shot put thrower Shaun Sewell. It is also adjustable and will be used as a template for future athletes, as David Sheffield explains. Read more ..
The Edge of Nature
|Kathryn Knight||September 7th 2012|
Sinking through the inky ocean, it would seem that there is little light at depth: but you'd be wrong. "In the mesopelagic realm [200 m] bioluminescence [light produced by animals] is very common", says Sönke Johnsen from Duke University, USA, explaining that many creatures are capable of producing light, yet rarely do so. But how much light do the inhabitants of the ocean floor (benthos) generate? Explaining that some bioluminescence is generated when organisms collide, Johnsen says, "In the benthos you have a current moving over complicated ground with all the things in the water banging into it, so one idea was that there would be a fair amount of bioluminescence."
Few people have visited this remote and inhospitable habitat. Intrigued by the animals that dwell there and the possibility that bioluminescent bacteria coating the ocean floor might glow faintly, long time collaborators Tamara Frank, Sonke Johnsen, Steven Haddock, Edith Widder and Charles Messing teamed up to find out just how much light is produced by seabed residents. Read more ..
The Genetic Edge
|Aileen Sheehy||September 7th 2012|
The GENCODE Consortium expects the human genome has twice as many genes than previously thought, many of which might have a role in cellular control and could be important in human disease. This remarkable discovery comes from the GENCODE Consortium, which has done a painstaking and skilled review of available data on gene activity.
Among their discoveries, the team describe more than 10,000 novel genes, identify genes that have 'died' and others that are being resurrected. The GENCODE Consortium reference gene catalogue has been one of the underpinnings of the larger ENCODE Project and will be essential for the full understanding of the role of our genes in disease.
The GENCODE Consortium is part of the ENCODE Project that, today, publishes 30 research papers describing findings from their nearly decade-long effort to describe comprehensively all the active regions of our human genome. ENCODE was launched in 2003 after the completion of the Human Genome Project, and brought together an international group of scientists tasked with identifying and describing all functional regions of the human genome sequence. Read more ..
The Health Edge
|Jim Erickson||September 7th 2012|
|Ruddy turnstone. Credit: Dendroica cerulea - Flickr|
Rising sea levels, melting glaciers, more intense rainstorms and more frequent heat waves are among the planetary woes that may come to mind when climate change is mentioned. Now, two University of Michigan researchers say an increased risk of avian influenza transmission in wild birds can be added to the list.
Population ecologists Pejman Rohani and Victoria Brown used a mathematical model to explore the consequences of altered interactions between an important species of migratory shorebird and horseshoe crabs at Delaware Bay as a result of climate change. They found that climate change could upset the carefully choreographed interactions between ruddy turnstone shorebirds and the horseshoe crabs that provide the bulk of their food during the birds' annual stopover at Delaware Bay, a major estuary of the Delaware River bordered by New Jersey to the north and Delaware to the south.
Climate change-caused disruptions to the well-timed interplay between the birds and crabs could lead to an increase in the avian influenza infection rate among ruddy turnstones and resident ducks of Delaware Bay, the researchers found. Because Delaware Bay is a crossroads for many bird species traveling between continents, an increase in the avian infection rate there could conceivably help spread novel subtypes of the influenza virus among North American wild bird populations, according to Rohani and Brown. Their findings were published in the journal Biology Letters. Read more ..
The Edge of Space
|Gertie Skaarup||September 6th 2012|
University of Copenhagen
|Mars’s north polar ice cap|
(credit: NASA/Caltech/JPL/E. DeJong/J. Craig/M. Stetson)
On Mars’s poles, there are ice caps of ice and dust with layers that reflect past climate variations on Mars. Researchers from the Niels Bohr Institute have related the layers in the ice cap on Mars’s north pole to variations in solar insolation on Mars, thus established the first dated climate history for Mars, where ice and dust accumulation has been driven by variations in insolation. The results are published in the scientific journal Icarus.
The ice caps on Mars’s poles are kilometres thick and composed of ice and dust. There are layers in the ice caps, which can be seen in cliffs and valley slopes and we have known about these layers for decades, since the first satellite images came back from Mars. The layers are believed to reflect past climate on Mars, in the same way that the Earth’s climate history can be read by analysing ice cores from the ice caps on Greenland and Antarctica.
Solar insolation on Mars has varied dramatically over time, mainly due to large variations in the tilt of Mars’s rotational axis (obliquity) and this led to dramatic climate variations on Mars. Read more ..
The Edge of the Universe
|Gertie Skaarup||September 6th 2012|
University of Copenhagen
Life is made up of a series of complex organic molecules, including sugars. A team of astronomers led by researchers from the Niels Bohr Institute, have now observed a simple sugar molecule in the gas surrounding a young star and this discovery proves that the building blocks of life were already present during planet formation. The results have been published in the scientific journal Astrophysical Journal Letters.
The star was observed with the new large international telescope, Atacama Large Millimeter Array (ALMA) in northern Chile. The ALMA telescopes are able to zoom in and study the details of newly formed stars and their rotating discs of dust and gas, which subsequently clumps together and forms planets. Among other things, the astronomers would like to investigate the gas for the presence of water vapour and examine the chemical composition for complex molecules.
"In the protoplanetary disc of gas and dust surrounding the young, newly formed star, we found glycolaldehyde molecules, which are a simple form of sugar. It is one of the building blocks in the process that leads to the formation of RNA and the first step in the direction of biology," explains astrophysicist Jes Jørgensen, Associate Professor at the Niels Bohr Institute and the Centre for Star and Planet Formation at the University of Copenhagen. Read more ..
The Edge of Nature
|Stephanie Murphy||September 6th 2012|
Woods Hole Oceanographic Institution
Ocean scientists have long known that juvenile coral reef fishes use coastal seagrass and mangrove habitats as nurseries, later moving as adults onto coral reefs. But the fishes’ movements, and the connections between different tropical habitats, are much more complex than previously realized, according to a recent study. The findings have important implications for management and protection of coral reefs and other marine environments.
A number of studies have demonstrated a strong relationship between the presence of coastal wetlands and offshore fish abundance and fisheries yield, but it has proved difficult to develop quantitative assessment of habitat use by fish or their movement among different habitats. “The rationale for this study,”says Simon Thorrold, a biologist at Woods Hole Oceanographic Institution (WHOI), “was to determine the relative importance of different nursery habitats to reef fishes that spend their adult lives on coral reefs but may spend at least part of their juvenile residency elsewhere.” Read more ..
Edge of the Universe
|Sam Orez||September 6th 2012|
From Tel Aviv University
Windows to the past, stars can unveil the history of our universe, currently estimated to be 14 billion years old. The farther away the star, the older it is — and the oldest stars are the most difficult to detect. Current telescopes can only see galaxies about 700 million years old, and only when the galaxy is unusually large or as the result of a big event like a stellar explosion.
Now, an international team of scientists led by researchers at Tel Aviv University have developed a method for detecting galaxies of stars that formed when the universe was in its infancy, during the first 180 million years of its existence. The method is able to observe stars that were previously believed too old to find, says Prof. Rennan Barkana of TAU's School of Physics and Astronomy.
Published in the journal Nature, the researchers' method uses radio telescopes to seek out radio waves emitted by hydrogen atoms, which were abundant in the early days of the universe. Emitting waves measuring about eight inches (21 centimeters) long, the atoms reflect the radiation of the stars, making their emission detectable by radio telescopes, explains Prof. Barkana. This development opens the way to learning more about the universe's oldest galaxies. Read more ..
The Edge of Space
|Faith Singer-Villalobos||September 4th 2012|
University of Texas
The Earth and the planets of our solar system are not alone in the universe. Over the past few decades, the hunt for extrasolar planets has yielded incredible discoveries, and now planetary researchers have a new tool—simulated models of how planets are born. Most planets form when a molecular cloud collapses into a young star. The leftover gas and dust form a disk around the star, and the particulates inside the disk begin to collide and coalesce over millions of years, forming larger and larger objects until a planet eventually takes shape.
Sally Dodson Robinson, astronomer, and her team of researchers at The University of Texas at Austin are modeling and simulating these protostellar disks. The simulations model important factors such as the turbulence and temperature of the disk, which affect how and where planets form. In a disk that is too turbulent, the particles move too fast and bounce off each other. Less turbulence means a greater chance for them to collide and stick together. Read more ..
The Edge of Nature
|Media Relations Office||September 4th 2012|
Woods Hole Oceangraphic Institution
When WHOI geologist Liviu Giosan first reconstructed the history of how the Danube River built its delta, he was presented with a puzzle.
In the delta’s early stages of development, the river deposited its sediment within a protected bay. As the delta expanded onto the Black Sea shelf in the late Holocene and was exposed to greater waves and currents, rather than seeing the decline in sediment storage that he expected, Giosan found the opposite. The delta continued to grow. In fact, it has tripled its storage rate.
If an increase in river runoff was responsible for the unusual rapid build up of sediment in the delta, says Giosan, the question is, “Was this extraordinary event in the Danube delta felt in the entire Black Sea basin? And if so, what caused it?” In answering those questions, Giosan and an international team of collaborators including environmental engineers, modelers, paleogeographers, and paleobiologists pieced together a unique history of the region that ultimately provides evidence for a transformative impact of humans on the Black Sea over hundreds, if not thousands of years. Read more ..
The Ancient Edge
|Natasha D. Pinol||September 3rd 2012|
A new report describes the complete sequence of the Denisovan genome, shedding light on the relationships between these archaic humans, who were closely related to Neandertals, and modern humans.
The results will be published online by the journal Science, in the 30 August 2012 edition of ScienceExpress. Science is the flagship journal of AAAS, the nonprofit science society.
Fossil evidence of the Denisovans is scanty; the existence of this group only came to light in 2010 when DNA from a piece of a finger bone and two molars that were excavated at Denisova Cave in the Altai Mountains of southern Siberia was studied. Because they had only a tiny sample of material from the finger bone, Svante Pääbo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany and his research team developed a treatment that unzipped the DNA so that each of its two strands can be used to generate molecules for sequencing. This method allowed the team to generate an extremely thorough genome sequence (30X), similar in quality to what researchers can obtain for the modern human genome. Read more ..
The Edge of Space
|Clare Lehane||September 3rd 2012|
The Moon is believed to have formed from a collision, 4.5 billion years ago, between Earth and an impactor the size of Mars, known as "Theia." Over the past decades scientists have simulated this process and reproduced many of the properties of the Earth-Moon system; however, these simulations have also given rise to a problem known as the Lunar Paradox: the Moon appears to be made up of material that would not be expected if the current collision theory is correct. A recent study published in Icarus proposes a new perspective on the theory in answer to the paradox.
If current theories are to be believed, analyses of the various simulations of the Earth-Theia collision predict that the Moon is mostly made up of material from Theia. However, studying materials from both Earth and the Moon, shows remarkable similarities. In fact, elements found on the Moon show identical isotopic properties to those found on Earth. Given it is very unlikely that both Theia and Earth had identical isotopic compositions (as all other known solar system bodies, except the Moon, appear to be different) this paradox casts doubt over the dominant theory for the Moon formation. Moreover, for some elements, like Silicon, the isotopic composition is the result of internal processes, related to the size of the parent body. Given Theia was smaller than Earth, its Silicon isotope composition should have definitely been different from that of Earth's mantle. Read more ..
The Digital Edge
|Rick Valenzuela||September 1st 2012|
A group of computer programmers and hackers in Austria is creating a low-cost way of spreading Internet access across communities. "FunkFeuer" which means "network fire" in German, uses everyday technology to create a wireless network, called a "mesh," that can transmit data from person to person, without involving companies or governments.
For most users, Internet access is a utility, like phone service and electricity. Customers pay a company to access the Web through phone service or cable TV lines. But FunkFeuer's equipment on Vienna rooftops is a different.
It provides wireless network access across large areas using the same open radio spectrum as WiFi. But unlike traditional WiFi, responsible for small wireless networks in homes and offices, the FunkFeuer mesh operates over much bigger distances. Read more ..
The Edge of Sleep
|Yivsam Azgad||September 1st 2012|
Is sleep learning possible? A new Weizmann Institute study appearing August 26 in Nature Neuroscience has found that if certain odors are presented after tones during sleep, people will start sniffing when they hear the tones alone – even when no odor is present – both during sleep and, later, when awake. In other words, people can learn new information while they sleep, and this can unconsciously modify their waking behavior.
Sleep-learning experiments are notoriously difficult to conduct. For one thing, the researchers must be sure that the subjects are actually asleep and stay that way during the “lessons.” The most rigorous trials of verbal sleep learning have failed to show any new knowledge taking root. While more and more research has demonstrated the importance of sleep for learning and memory consolidation, none had managed to show actual learning of new information taking place in an adult brain during sleep. Read more ..
The Edge of Space
|John Zimmer||August 31st 2012|
A composite image now shows a superbubble in the Large Magellanic Cloud (LMC), a small satellite galaxy of the Milky Way, located about 160,000 light years from Earth. Many new stars, some of them very massive, are forming in the star cluster NGC 1929, which is embedded in the nebula N44. The massive stars produce intense radiation, expel matter at high speeds, and race through their evolution to explode as supernovas. The winds and supernova shock waves carve out huge cavities called superbubbles in the surrounding gas. X-rays from NASA's Chandra X-ray Observatory (blue) show hot regions created by these winds and shocks, while infrared data from NASA's Spitzer Space Telescope (red) outline where the dust and cooler gas are found. The optical light from the 2.2m Max-Planck-ESO telescope (yellow) in Chile shows where ultraviolet radiation from hot, young stars is causing gas in the nebula to glow.
A long-running problem in high-energy astrophysics has been that some superbubbles in the LMC, including N44, give off a lot more X-rays than expected from models of their structure. A Chandra study published in 2011 showed that there are two extra sources of the bright X-ray emission: supernova shock waves striking the walls of the cavities, and hot material evaporating from the cavity walls. Read more ..
The Edge of Nature
|Caroline Perry||August 31st 2012|
Captivated by a strange coiling behavior in the grasping tendrils of the cucumber plant, researchers at Harvard University have characterized a new type of spring that is soft when pulled gently and stiff when pulled strongly. Instead of unwinding to a flat ribbon under stress, as an untwisted coil normally would, the cucumber's tendrils actually coil further. Understanding this counterintuitive behavior required a combination of head scratching, physical modeling, mathematical modeling, and cell biology—not to mention a large quantity of silicone. The result, published in the August 31 issue of Science, describes the mechanism by which coiling occurs in the cucumber plant and suggests a new type of bio-inspired twistless spring.
Led by principal investigator L. Mahadevan, Lola England de Valpine Professor of Applied Mathematics at the Harvard School of Engineering and Applied Sciences (SEAS), Professor of Organismic and Evolutionary Biology and Professor of Physics at Harvard, and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard, the researchers were motivated by simple curiosity about the natural world. Read more ..
The Nano Edge
|Julien Happich||August 31st 2012|
Researchers from the MIT have succeeded in making a variety of electronic components from molybdenum disulfide (MoS2), a 2D molecule that could yield ultra-miniature devices. A report on the production of complex electronic circuits from the new material was published online this month in the journal Nano Letters; the paper is authored by Han Wang and Lili Yu, graduate students in the Department of Electrical Engineering and Computer Science (EECS); Tomás Palacios, the Emmanuel E. Landsman Associate Professor of EECS; and others at MIT and elsewhere.
Palacios says he thinks graphene and MoS2 are just the beginning of a new realm of research on two-dimensional materials. "It's the most exciting time for electronics in the last 20 or 30 years," he says. "It's opening up the door to a completely new domain of electronic materials and devices." Read more ..
The Edge of Earth
|Steve Herman||August 30th 2012|
Some high profile researchers in the earth sciences are questioning several long-standing assumptions about predicting earthquakes. They contend it is time for a major reassessment on the methods used to forecast where and when killer earthquakes will strike.
Three recent major earthquakes: in Sichuan, China in 2008, in the Caribbean nation of Haiti in 2010 and in northeastern Japan last year - have led to what some scientists acknowledge is an embarrassing failure. They did not foresee such intense tremors would cause widespread destruction and casualties in those specific locations.
Even in Japan, with state-of-the-art seismological and tsunami research and sophisticated hazard mapping, the size of the March 11 quake and the resulting tsunami were vastly underestimated. Earth sciences professor Seth Stein at Northwestern University in Chicago says that was a sobering day for his field. Read more ..
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