Industrial wet spinning processes produce fibers from polymers and other materials by using tiny needles to eject continuous jets of liquid precursors. The electrically charged liquids ejected from the needles normally exhibit a chaotic “whipping” structure as they enter a secondary liquid that surrounds the microscopic jets.
Typically a highly conductive material, graphene becomes a semiconductor when prepared as an ultra-narrow ribbon. Recent research has now developed a new method to selectively dope graphene molecules with nitrogen atoms. By seamlessly stringing together doped and undoped graphene pieces, ”heterojunctions” are formed in the nanoribbons, allowing electric current to flow in only one direction when voltage is applied.
Researchers have shown how to use a new imaging platform to map lipid metabolism in living cells, discovering specifically where cholesterol is stored and pointing toward further studies in obesity, diabetes and longevity. The imaging approach makes it possible to not only quantify the storage of cholesterol, but also the "desaturation" and oxidation of lipids, which may reduce the ability of cells to use insulin.
For decades, doctors have developed methods to diagnose how different types of cells and systems in the body are functioning. Now scientists have adapted an emerging biomedical technique to study the vast body of the ocean. In recent work they have demonstrated that they can identify and measure proteins in the ocean, revealing how single-celled marine organisms and ocean ecosystems operate.
Dr. John Carr, a scientist at the U.S. Naval Research Laboratory, is part of an international team that has found what they believe is evidence of a planet forming around a star about 335 light years from Earth. They made the chance discovery while studying the protoplanetary disk of gas around a distant forming star using a technique called spectro-astrometry, which allows astronomers to detect small changes in the position of moving gas.
Using an "electric prism", or deflector, scientists have found a new way of separating water molecules that differ only in their nuclear spin states and, under normal conditions, do not part ways. Since water is such a fundamental molecule in the universe, the recent study may impact a multitude of research areas ranging from biology to astrophysics.
An international team has engineered and studied “active vesicles." These purely synthetic, molecularly thin sacs are capable of transforming energy, injected at the microscopic level, into organized, self-sustained motion.The ability to create spontaneous motion and stable oscillations is a hallmark of living systems and reproducing and understanding this behavior remains a significant challenge for researchers.
Hundreds of children in about a dozen states have been sickened by a severe respiratory illness that public health officials suspect may be caused by an uncommon virus similar to the germ that causes the common cold. Nearly 500 children have been treated at one hospital alone—Children's Mercy in Kansas City—and some required intensive care, according to authorities.
The National Institutes of Health said it has uncovered a nearly century-old container of ricin and a handful of other forgotten samples of dangerous pathogens as it combs its laboratories for improperly stored hazardous materials. The agency began an intensive investigation of all its facilities after a scientist in July found vials of smallpox dating from the 1950s.
Key discoveries about breast cancer, Parkinson's disease and the body's handling of defective proteins have earned prestigious medical awards for five scientists. The Albert and Mary Lasker Foundation announced the winners Monday. Each prize includes a $250,000 honorarium. The awards will be presented Sept. 19 in New York.
Omega Engineering has introduced its new series of pressure/temperature data loggers. The OM-PR series features a temperature range of -20 to 85 C (-4 to 185 F). Pressure ranges are 35, 150, 350, 550, 2,000 and 5,800 psia. Vacuum ranges are 760 and 380 Torr.
Hiden Analytical has released its latest product catalog. The catalog highlights the full range of application-specific standard systems for analysis of gases and vapors in diverse environments, addressing measurement of samples at pressure from millibar to 30 atmospheres and with sample quantities down to less than 0.1 scc.
New research in Europe suggests that testing the temperature of breath could be a simple and noninvasive method to either confirm or reject the presence of lung cancer. Many research teams have been looking at the possibility of using breath tests for a number of cancers but this is the first study looking at breath temperature as a marker in lung cancer.
Accurately examining materials in liquids using electron microscopy is a difficult task for scientists, as electron beams perturb the sample and induce artifacts. Scientists at Pacific Northwest National Laboratory and the Univ. of California, Davis have demonstrated that in in situ liquid experiments, the choice of electron beam energy has a strong effect that goes far beyond merely increasing the concentration of reducing radicals.
A new class of synthetic platelet-like particles could augment natural blood clotting for the emergency treatment of traumatic injuries. The clotting particles, which are based on soft and deformable hydrogel materials, are triggered by the same factor that initiates the body’s own clotting processes.