Mice genetically deficient in serotonin, a crucial brain chemical implicated in clinical depression, are more vulnerable than their normal littermates to social stressors, according to a Duke Univ. study. Following exposure to stress, the serotonin-deficient mice also did not respond to a standard antidepressant, fluoxetine (Prozac), which works by boosting serotonin transmission between neighboring neurons.
Brigham Young Univ. biologist Jonathan Alder has a startling secret he doesn’t freely share: he knows when most of us are going to die. Okay, he doesn’t know exactly the day or time, but he has a pretty good idea, thanks to his research on tiny biological clocks attached to our chromosomes. These DNA end caps, called telomeres, are the great predictors of life expectancy: the shorter your telomeres, the shorter your lifespan.
Planetary scientists have calculated that there are hundreds of billions of Earth-like planets in our galaxy which might support life. The new research, led by The Australian National Univ., made the finding by applying a 200 year old idea to the thousands of exoplanets discovered by the Kepler space telescope.
Firing off a string of action snapshots like a sports photographer at a NASCAR race, NASA's Hubble Space Telescope captured the rare occurrence of three of Jupiter's largest moons racing across the banded face of the gas-giant planet: Europa, Callisto and Io.
Nearly all studies used to promote biofuels as climate-friendly alternatives to petroleum fuels are flawed and need to be redone, according to a Univ. of Michigan researcher. Once the erroneous methodology is corrected, the results will likely show that policies used to promote biofuels actually make matters worse when it comes to limiting net emissions of climate-warming carbon dioxide gas.
A team of scientists has identified the complex process by which materials are shaped and ultimately dissolved by surrounding water currents. The study, conducted by researchers at New York Univ. (NYU)’s Courant Institute of Mathematical Sciences and Florida State Univ., appears in the Journal of Fluid Mechanics.
The more scientists study pigeons, the more they learn how their brains operate in ways not so different from our own. In a new study from the Univ. of Iowa, researchers found that pigeons can categorize and name both natural and manmade objects. These birds categorized 128 photographs into 16 categories, and they did so simultaneously.
While the mysterious, unseen forces magnets project are now (mostly) well understood, they can still occasionally surprise us. For instance, thin films of cobalt have been observed to spontaneously switch their poles: something that typically doesn’t happen in the absence of an external magnetic field. Physicists at NIST and the Univ. of Maryland have measured this phenomenon on the largest scale yet.
Birds are unwitting masters of fluid dynamics: They manipulate airflow each time they flap their wings, pushing air in one direction and moving themselves in another. Two New York Univ. researchers have taken inspiration from avian locomotion strategies and created a pump that moves fluid using vibration instead of a rotor.
Researchers at Virginia Commonwealth Univ. and universities in China and Japan have discovered a new structural variant of carbon called "penta-graphene", a very thin sheet of pure carbon that has a unique structure inspired by a pentagonal pattern of tiles found paving the streets of Cairo.
From manufacturing life-saving biopharmaceuticals to producing energy-efficient biofuels, the cost-effective production of proteins will be essential to revolutionizing the future of health care and energy. For years, scientists have turned to yeast as a quick and inexpensive way to mass-produce proteins for a variety of useful products. Now Northwestern Univ. has found a way to gather more protein without making the yeast produce more.
As a grape slowly dries and shrivels, its surface creases, ultimately taking on the wrinkled form of a raisin. Similar patterns can be found on the surfaces of other dried materials, as well as in human fingerprints. While these patterns have long been observed in nature, and more recently in experiments, scientists have not been able to come up with a way to predict how such patterns arise in curved systems, such as microlenses.
Moderate consumption of alcohol has been associated with health benefits in some, but not all, studies. Researchers at the Yale Univ. School of Medicine may have found an explanation, in part, for why non-smokers might benefit from a glass of wine.
Human taste receptors are specialized to distinguish several distinct compounds: sugars taste sweet, salts taste salty, and acidic compounds taste sour. Now a new study from Massachusetts Institute of Technology finds that the worm Caenorhabditis elegans has taken its powers of detection a step further: The worm can taste hydrogen peroxide, triggering it to stop eating the potentially dangerous substance.
One of nature’s fascinating questions is how zebras got their stripes. A team of life scientists led by Univ. of California, Los Angeles has found at least part of the answer: The amount and intensity of striping can be best predicted by the temperature of the environment in which zebras live.
The American public and U.S. scientists are light-years apart on science issues. And 98% of surveyed scientists say it's a problem that we don't know what they're talking about. Scientists are far less worried about genetically modified food, pesticide use, and nuclear power than is the general public, according to matching polls of both the general public and the country's largest general science organization.
The health-promoting perks of wine have attracted the spotlight recently, leaving beer in the shadows. But scientists are discovering new ways in which the latter could be a more healthful beverage than once thought. They’re now reporting that a compound from hops could protect brain cells from damage, and potentially slow the development of disorders such as Alzheimer’s and Parkinson’s diseases.
New battery technology from the Univ. of Michigan should be able to prevent the kind of fires that grounded Boeing 787 Dreamliners in 2013. The innovation is an advanced barrier between the electrodes in a lithium-ion battery. Made with nanofibers extracted from Kevlar, the tough material in bulletproof vests, the barrier stifles the growth of metal tendrils that can become unwanted pathways for electrical current.
NIST scientists have developed a novel method to rapidly and accurately calibrate gas flow meters, such as those used to measure natural gas flowing in pipelines, by applying a fundamental physical principle: When a sound wave travels through a gas containing temperature gradients, the sound wave's average speed is determined by the average temperature of the gas.
Univ. of California, Irvine and Australian chemists have figured out how to unboil egg whites, an innovation that could dramatically reduce costs for cancer treatments, food production and other segments of the $160 billion global biotechnology industry, according to findings published in ChemBioChem.
Scientists have long known that the speed of light can be slowed slightly as it travels through materials such as water or glass. However, it has generally been thought impossible for particles of light, known as photons, to be slowed as they travel through free space, unimpeded by interactions with any materials.
E. coli usually brings to mind food poisoning and beach closures, but researchers recently discovered a protein in E. coli that inhibits the accumulation of potentially toxic amyloids, a hallmark of diseases such as Parkinson's. Amyloids are formed by proteins that misfold and group together, and when amyloids assemble at the wrong place or time, they can damage brain tissue and cause cell death.
The Bulletin of the Atomic Scientists says Earth is now closer to human-caused doomsday than it has been in more than 30 years because of global warming and nuclear weaponry. But other experts say that's way too gloomy. The advocacy group founded by the creators of the atomic bomb moved their famed "Doomsday Clock" ahead two minutes on Thursday.
Pioneering new research has debunked the theory that the asteroid thought to have led to the extinction of dinosaurs also caused vast global firestorms that ravaged planet Earth. A team of researchers from the Univ. of Exeter, Univ. of Edinburgh and Imperial College London recreated the immense energy released from an extraterrestrial collision with Earth that occurred around the time that dinosaurs became extinct.
Does glass ever stop flowing? Researchers have combined computer simulation and information theory, originally invented for telephone communication and cryptography, to answer this puzzling question. Watching a glass blower at work we can clearly see the liquid nature of hot glass. Once the glass has cooled down to room temperature though, it has become solid and we can pour wine in it or make window panes out of it.