Ice contains many atoms and molecules trapped inside its structure. A team of Univ. of Chicago and Loyola Univ. researchers has discovered a new mechanism they call "stable energetic embedding" of atoms and molecules within ice. This mechanism explains how some molecules, such as CF4, or "carbon tetrafluoride", interact with and become embedded beneath ice surfaces.
Graphene quantum dots created at Rice Univ. grab onto graphene platelets like barnacles attach...
The atmospheric conditions associated with the unprecedented drought currently afflicting California are "very likely" linked to human-caused climate change, according to Stanford Univ. scientists. The team used a combination of computer simulations and statistical techniques to show that a persistent region of high atmospheric pressure hovering over the Pacific Ocean was likely to form from modern greenhouse gas concentrations.
For decades, planetary geologists have speculated that glaciers might once have crept through Valles Marineris, the 2000-mile-long chasm that constitutes the Grand Canyon of Mars. A research team has now identified what could be the first mineralogical evidence of past glaciers within the Valles Marineris: a layer of mixed sulfate minerals halfway up three-mile-high cliffs in the canyon system.
Droplets are simple spheres of fluid, not normally considered capable of doing anything on their own. But now researchers have made droplets of alcohol move through water, even moving through complex mazes. The droplets can be led to certain targets, using a surprisingly simple impetus. In the future, such moving droplets may deliver medicines, moving entire chemistries to targets.
An Oak Ridge National Laboratory team has unlocked the enzymatic synthesis process of rare sugars, which are useful in developing drugs with low side effects. In a recently published paper, the team reported the pioneering use of neutron and x-ray crystallography and HPC to study how the enzyme D-xylose isomerase, or XI, can cause a biochemical reaction in natural sugar to produce rare sugars.
Scanning electron microscopes can determine chemical compositions with the help of energy dispersive spectrometers. However, lighter elements like carbon emit secondary fluorescence in an energy range insufficiently resolved by these instruments. Physicists have developed a potential solution to this problem by adding reflection zone plate optics to a specialized spectrometer that delivers high resolution from 50 to 1,120 eV.
Almost all of today’s previously existing cell-sorting methods rely on what is called a single-cell analysis platform. A researcher in Hawaii took a different approach, inventing a bulk method that sorts different cell populations by tuning their solubility. Instead of targeting individual features, the measurement principle sorts cells by differentiating their characteristic surface free energies.
Seeking to expand the United States' capability to detect and identify materials that are not easily visualized, DARPA this week released an announcement inviting proposals to develop portable, next-generation imaging tools that combine the complementary benefits of x-rays, which efficiently detect heavier elements, and neutron radiography, which is not as portable as x-ray detectors but can identify liquids and lighter elements.
Astronomers using data from NASA's space telescopes Hubble, Spitzer, and Kepler have discovered clear skies and steamy water vapor on a gaseous planet outside our solar system. The planet is about the size of Neptune, making it the smallest planet from which molecules of any kind have been detected.
Up to half of the water on Earth is likely older than the solar system itself, Univ. of Michigan astronomers theorize. The researchers' work helps to settle a debate about just how far back in galactic history our planet and our solar system's water formed. Were the molecules in comet ices and terrestrial oceans born with the system itself—in the planet-forming disk of dust and gas that circled the young sun 4.6 billion years ago?
The excessive atmospheric carbon dioxide that is driving global climate change could be harnessed into a renewable energy technology that would be a win for both the environment and the economy. That is the lure of artificial photosynthesis in which the electrochemical reduction of carbon dioxide is used to produce clean, green and sustainable fuels.
As U.S. energy imports dramatically drop it would appear that renewables investment is in jeopardy, including the biofuels market. There’s some evidence to support this; but if declining or stalled investment is predicated on the limited potential of existing technology, much of which still relies on biomass, the biofuels industry may, in fact, be undergoing a natural transition instead of a decline.
For more than five years, Amy Landis, an engineering professor at Arizona State Univ., has led research that is revealing the potential rewards of developing large-scale biofuels production, as well as the potential drawbacks we would face in the effort. According to Landis, lands damaged by industrial waste or other pollutants could be restored sufficiently to support agriculture for growing bioenergy crops.
Experiments at SLAC National Accelerator Laboratory solve a long-standing mystery in the role calcium atoms serve in a chemical reaction that releases oxygen into the air we breathe. The results offer new clues about atomic-scale processes that drive the life-sustaining cycle of photosynthesis and could help forge a foundation for producing cleaner energy sources by synthesizing nature's handiwork.
Scientists have scoured cow rumens and termite guts for microbes that can efficiently break down plant cell walls for the production of next-generation biofuels, but some of the best microbial candidates actually may reside in the human lower intestine, researchers report. Their studyis the first to use biochemical approaches to confirm the hypothesis that microbes in the human gut can digest fiber.
Purdue Univ. researchers have discovered the structure of the enzyme that makes cellulose, a finding that could lead to easier ways of breaking down plant materials to make biofuels and other products and materials. The research also provides the most detailed glimpse to date of the complicated process by which cellulose is produced.
Bacillus anthracis bacteria have very efficient machinery for injecting toxic proteins into cells, leading to the potentially deadly infection known as anthrax. A team of Massachusetts Institute of Technology (MIT) researchers has now hijacked that delivery system for a different purpose: administering cancer drugs.
Scientists at the U.S. Naval Research Laboratory have introduced a new one-step process using, for the first time in these types of syntheses, potassium superoxide to rapidly form oxide nanoparticles from simple salt solutions in water. An important advantage of this method is the capability of creating bulk quantities of these materials, more than 10 g in a single step.
Cleaning up oil sands tailings has just gotten a lot greener thanks to a novel technique developed by Univ. of Alberta civil engineering professors that uses solar energy to accelerate tailings pond reclamation efforts by industry. Instead of using ultraviolet lamps as a light source to treat the water affected by oil sands processes, sunlight alone treats just as efficiently but at a much lower cost.
This short course will provide practical training in the field of cell culture, bioreactor operation, bioprocess paradigm and separation technology. It will also increase understanding of the industrial food and drug fermentation biotechnology through simulation, sterilization technologies and clinical implications, as well as related research done across different countries, universities and industries.
Nanocomposite oxide ceramics have potential uses as ferroelectrics, fast ion conductors, and nuclear fuels and for storing nuclear waste, generating a great deal of scientific interest on the structure, properties, and applications of these blended materials. Los Alamos National Laboratory researchers have made the first observations of the relationship between the chemistry and dislocation structures of the nanoscale interfaces.
Donald Sadoway and his colleagues at the Massachusetts Institute of Technology have already started a company to produce electrical-grid-scale liquid batteries, whose layers of molten material automatically separate due to their differing densities. But a newly developed formula substitutes different metals for the molten layers. The new formula allows the battery to work at a much lower temperature.
Achieving complete breakdown of plant biomass for energy conversion in industrialized bioreactors remains a complex challenge, but new research shows that termite fungus farmers solved this problem more than 30 million years ago. The new insight reveals that the great success of termite farmers as plant decomposers is due to division of labor.
Inertial confinement fusion creates nanosecond bursts of neutrons, ideal for creating data to plug into supercomputer codes that test the U.S. nuclear stockpile. Down the road, it could be useful as a source of energy. Researchers at Sandia National Laboratories’ Z machine have produced a significant output of fusion neutrons, using a method fully functioning for only little more than a year.
For the first time, scientists led by John V. Badding, a professor of chemistry at Penn State Univ., have discovered how to produce ultra-thin "diamond nanothreads" that promise extraordinary properties, including strength and stiffness greater than that of today's strongest nanotubes and polymers. The core of the nanothreads is a long, thin strand of carbon atoms arranged just like the fundamental unit of a diamond's structure.
Shellfish such as mussels and barnacles secrete very sticky proteins that help them cling to rocks or ship hulls, even underwater. Inspired by these natural adhesives, a team of Massachusetts Institute of Technology engineers has designed new materials that could be used to repair ships or help heal wounds and surgical incisions.
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