Biotech

New Study Says Governments Should Ditch Reliance On Biofuels 99

Posted by samzenpus
from the won't-somebody-please-think-of-the-switchgrass? dept.
HughPickens.com writes The NYT reports on a new study from a prominent environmental think tank that concludes turning plant matter into liquid fuel or electricity is so inefficient that the approach is unlikely ever to supply a substantial fraction of global energy demand. They add that continuing to pursue this strategy is likely to use up vast tracts of fertile land that could be devoted to helping feed the world's growing population. "I would say that many of the claims for biofuels have been dramatically exaggerated," says Andrew Steer, president of the World Resources Institute, a global research organization based in Washington that is publishing the report. "There are other, more effective routes to get to a low-carbon world." The report follows several years of rising concern among scientists about biofuel policies in the United States and Europe, and is the strongest call yet by the World Resources Institute, known for nonpartisan analysis of environmental issues, to urge governments to reconsider those policies.

Timothy D. Searchinger says recent science has challenged some of the assumptions underpinning many of the pro-biofuel policies that have often failed to consider the opportunity cost of using land to produce plants for biofuel. According to Searchinger, if forests or grasses were grown instead of biofuels, that would pull carbon dioxide out of the air, storing it in tree trunks and soils and offsetting emissions more effectively than biofuels would do. What is more, as costs for wind and solar power have plummeted over the past decade, and the new report points out that for a given amount of land, solar panels are at least 50 times more efficient than biofuels at capturing the energy of sunlight in a useful form. "It's true that our first-generation biofuels have not lived up to their promise," says Jason Hill said. "We've found they do not offer the environmental benefits they were purported to have, and they have a substantial negative impact on the food system."
Science

The Gap Between What The Public Thinks And What Scientists Know 237

Posted by samzenpus
from the what-do-you-know? dept.
First time accepted submitter burtosis writes Despite similar views about the overall place of science in America, the general public and scientists often see science-related issues through a different lens, according to a new pair of surveys by the Pew Research Center in collaboration with the American Association for the Advancement of Science (AAAS). From FiveThirtyEight: "The surveys found broad support for government to spend money on science, but that doesn't mean the public supports the conclusions that scientists draw. The biggest gap between scientists and the public came on issues that may elicit fear: the safety of genetically modified (or GMO) foods (37 percent of the public said GMOs were safe, compared to 88 percent of scientists) and the use of pesticides in agriculture (28 percent of the public said foods grown with pesticides were safe to eat, versus 68 percent of scientists). There was also disagreement over the cause of climate change (50 percent of the public said it is mostly due to human activity, compared to 87 percent of scientists). Here’s a full list, via Pew Research Center, of the scientific issues the survey asked about."
Biotech

FDA Wants To Release Millions of Genetically Modified Mosquitoes In Florida 187

Posted by samzenpus
from the I've-seen-this-movie dept.
MikeChino writes In an attempt to curb outbreaks of two devastating tropical diseases in the Florida Keys, the FDA is proposing the release of millions of genetically modified mosquitoes into the area. Scientists have bred male mosquitoes with virus gene fragments, so when they mate with the females that bite and spread illness, their offspring will die. This can reduce the mosquito population dramatically, halting the spread of diseases like dengue fever.
Science

Spire Plans To Use Tiny Satellites For More Accurate Weather Forecasts 24

Posted by timothy
from the up-in-the-air dept.
Zothecula writes Weather forecasting is a notoriously inexact science. According to San Francisco-based tech startup Spire, this is partially because there are currently less than 20 satellites responsible for gathering all of the world's weather data – what's more, some of the older ones are using outdated technology. Spire's solution? Establish a linked network of over 100 shoebox-sized CubeSats, that will use GPS technology to gather 100 times the amount of weather data than is currently possible. The first 20 of those satellites are scheduled to launch later this year.
Australia

The Quantum Experiment That Simulates a Time Machine 132

Posted by timothy
from the already-been-done dept.
KentuckyFC writes One of the extraordinary features of quantum mechanics is that one quantum system can simulate the behaviour of another that might otherwise be difficult to create. That's exactly what a group of physicists in Australia have done in creating a quantum system that simulates a quantum time machine. Back in the early 90s, physicists showed that a quantum particle could enter a region of spacetime that loops back on itself, known as a closed timelike curve, without creating grandfather-type paradoxes in which time travellers kill their grandfathers thereby ensuring they could never have existed to travel back in time in the first place. Nobody has ever built a quantum closed time-like curve but now they don't have to. The Australian team have simulated its behaviour by allowing two entangled photons to interfere with each other in a way that recreates the behaviour of a single photon interacting with an older version of itself. The results are in perfect agreement with predictions from the 1990s--there are no grandfather-type paradoxes. Interestingly, the results are entirely compatible with relativity, suggesting that this type of experiment might be an interesting way of reconciling it with quantum mechanics.
Space

The Big Bang By Balloon 23

Posted by samzenpus
from the in-the-beginning dept.
StartsWithABang writes If you want to map the entire sky — whether you're looking in the visible, ultraviolet, infrared or microwave, your best bet is to go to space. Only high above the Earth's atmosphere can you map out the entire sky, with your vision unobscured by anything terrestrial. But that costs millions of dollars for the launch alone! What if you've got new technology you want to test? What if you still want to defeat most of the atmosphere? (Which you need to do, for most wavelengths of light.) And what if you want to make observations on large angular scales, something by-and-large impossible from the ground in microwave wavelengths? You launch a balloon! The Spider telescope has just completed its data-taking operations, and is poised to take the next step — beyond Planck and BICEP2 — in understanding the polarization of the cosmic microwave background.
Medicine

Brain Implants Get Brainier 49

Posted by samzenpus
from the thinking-better dept.
the_newsbeagle writes "Did my head just beep?" wonders a woman who just received a brain implant to treat her intractable epilepsy. We're entering a cyborg age of medicine, with implanted stimulators that send pulses of electricity into the brain or nervous system to prevent seizures or block pain. The first generation of devices sent out pulses in a constant and invariable rhythm, but device-makers are now inventing smart stimulators that monitor the body for signs of trouble and fire when necessary.
Science

Spider Spins Electrically Charged Silk 40

Posted by samzenpus
from the will-you-walk-into-my-electric-parlour? dept.
sciencehabit writes In their quest to make ultrastrong yet ultrasmall fibers, the polymer industry may soon take a lesson from Uloborus spiders. Uloborids are cribellate spiders, meaning that instead of spinning wet, sticky webs to catch their prey, they produce a fluffy, charged, wool-like silk. A paper published online today in Biology Letters details the process for the first time. It all starts with the silk-producing cribellar gland. In contrast with other spiders, whose silk comes out of the gland intact, scientists were surprised to discover that uloborids' silk is in a liquid state when it surfaces. As the spider yanks the silk from the duct, it solidifies into nanoscale filaments. This "violent hackling" has the effect of stretching and freezing the fibers into shape. It may even be responsible for increasing their strength, because filaments on the nanoscale become stronger as they are stretched. In order to endow the fibers with an electrostatic charge, the spider pulls them over a comblike plate located on its hind legs. The technique is not unlike the so-called hackling of flax stems over a metal brush in order to soften and prepare them for thread-spinning, but in the spider's case it also gives them a charge. The electrostatic fibers are thought to attract prey to the web in the same way a towel pulled from the dryer is able to attract stray socks.
Medicine

Scientists Discover How To Track Natural Errors In DNA Replication 19

Posted by samzenpus
from the points-of-failure dept.
BarbaraHudson writes Researchers figured out how to label and keep track of new pieces of DNA, and learned to follow the enzyme responsible for copying those pieces. Their research focused on enzymes called polymerases. These enzymes create small regions in DNA that act as scaffolds for the copied DNA. Scientists assumed that the body deletes the scaffolds containing errors, or mutations, and the standard computer models supported this theory. However, the actual research showed that about 1.5 percent of those erroneous scaffolds are left over, trapped within the DNA. After running models, scientists now believe they can track how DNA replicates and find the most likely areas where these scaffolds with errors turn up. The erroneous scaffolds usually appear close to genetic switches, those regions that turn on when genes activate. The mutations damage the switch, which results in genetic disease, as well as increasing the likelihood of cancer.
Medicine

Scientists 3D-Printing Cartilage For Medical Implants 23

Posted by samzenpus
from the body-printing dept.
Molly McHugh writes Scientists and physicians at The Feinstein Institute for Medical Research have discovered a way to use MakerBot's 3D-printing technologies to create cartilage and repair tissue damage in the trachea. From the article: "Researchers found that it’s possible to use the MakerBot Replicator 2X Experimental 3D Printer to print what’s called 'scaffolding,' made up of PLA, a bioplastic commonly used in in surgical implant devices. The team customized the printer so that living cells could be printed onto the scaffolding. The 3D-printed mixture of healthy cells found in cartilage, and collagen, eventually grew into the shape of a trachea that could be implanted into a patient."
Programming

Anonymous No More: Your Coding Style Can Give You Away 218

Posted by samzenpus
from the leaving-your-mark dept.
itwbennett writes Researchers from Drexel University, the University of Maryland, the University of Goettingen, and Princeton have developed a "code stylometry" that uses natural language processing and machine learning to determine the authors of source code based on coding style. To test how well their code stylometry works, the researchers gathered publicly available data from Google's Code Jam, an annual programming competition that attracts a wide range of programmers, from students to professionals to hobbyists. Looking at data from 250 coders over multiple years, averaging 630 lines of code per author their code stylometry achieved 95% accuracy in identifying the author of anonymous code (PDF). Using a dataset with fewer programmers (30) but more lines of code per person (1,900), the identification accuracy rate reached 97%.
Science

Graphene: Reversible Method of Magnetic Doping Paves Way For Semiconductor Use 38

Posted by Soulskill
from the nano-baby-steps dept.
concertina226 writes: A team of physicists at University of California, Riverside have discovered how to induce magnetism in graphene in a way that still preserves the material's electronic properties, which paves the way for graphene to be used as a semiconductor.

The researchers grew a sheet of yttrium iron garnet using laser molecular beam epitaxy in a laboratory (abstract). Magnetic substances like iron are known to disrupt graphene's electrical conduction properties, but yttrium iron garnet works well as it is an electric insulator.

When a graphene sheet was placed on top of an atomically smooth sheet of yttrium iron garnet, the graphene borrowed the magnetic properties from the yttrium iron garnet and became magnetized without the need for doping.
Science

New Micro-Ring Resonator Creates Quantum Entanglement On a Silicon Chip 58

Posted by Soulskill
from the approaching-technobabble-territory dept.
Zothecula writes: The quantum entanglement of particles, such as photons, is a prerequisite for the new and future technologies of quantum computing, telecommunications, and cyber security. Real-world applications that take advantage of this technology, however, will not be fully realized until devices that produce such quantum states leave the realms of the laboratory and are made both small and energy efficient enough to be embedded in electronic equipment. In this vein, European scientists (abstract) have created and installed a tiny "ring-resonator" on a microchip that is claimed to produce copious numbers of entangled photons while using very little power to do so.
Space

We May Have Jupiter To Thank For the Nitrogen In Earth's Atmosphere 46

Posted by Soulskill
from the jupiter-never-forgets-our-birthday dept.
An anonymous reader writes: Nitrogen makes up about 78% of the Earth's atmosphere. It's also the 4th most abundant element in the human body. But where did all the nitrogen on Earth come from? Scientists aren't sure, but they have a new theory. Back when the solar system was just a protoplanetary disk, the ice orbiting the early Sun included ammonia, which has a nitrogen atom and three hydrogen atoms. But there needed to be a way for the nitrogen to get to the developing Earth. That's where Jupiter comes in. During its theorized Grand Tack, where it plunged into the inner solar system and then retreated outward again, it created shock waves in the dust and ice cloud surrounding the sun. These shock waves caused gentle heating of the ammonia ice, which allowed it to melt and react with chromium-bearing metal to form a mineral called carlsbergite. New research (abstract) suggests this mineral was then present when the Earth's accretion happened, supplying much of the nitrogen we would eventually need for life.
Science

Engineers Develop 'Ultrarope' For World's Highest Elevator 244

Posted by Soulskill
from the for-when-super-rope-just-doesn't-cut-it dept.
HughPickens.com writes: Halfway up the Shard, London's tallest skyscraper, you are asked to step out of the elevator at the transfer floor, or "sky lobby," a necessary inconvenience in order to reach the upper half of the building, and a symptom of the limits of elevators today. To ascend a mile-high (1.6km) tower using the same technology could necessitate changing elevators as many as 10 times. Elevators traveling distances of more than 500m [1,640 ft] have not been feasible because the weight of the steel cables themselves becomes so great. Now, after nine years of rigorous testing, Kone has released Ultrarope — a material composed of carbon-fiber covered in a friction-proof coating that weighs a seventh of the steel cables, making elevators of up to 1km (0.6 miles) in height feasible to build.

Kone's creation was chosen to be installed in what's destined to become the world's tallest building, the Kingdom Tower in Jeddah, Saudi Arabia. When completed in 2020, the tower will stand a full kilometer in height, and will boast the world's tallest elevator at 660m (2,165ft). A 1km-tall tower may seem staggering, but is this the build-able limit? Most probably not, according to Dr. Sang Dae Kim. "With Kingdom Tower we now have a design that reaches around 1 km in height. Later on, someone will push for 1 mile, and then 2 km," says Kim. He adds that, technically speaking, 2 km might be possible at the current time. Anything higher would require new materials and building techniques.