Charge ordering in mixed-valence compounds, which usually contain positively charged cations in more than one formal charge state, is of crucial importance for materials science. Many functional properties of materials like magnetism, magnetoresistance, ionic conductivity and superconductivity are found in mixed valence compounds. One of the very first attempts to understand the mechanism of a charge ordering transition dates back to 1939 when Evert Verwey, a Dutch chemist, observed a sudden jump in resistivity in the prototypic mixed valence compound magnetite, Fe3O4, near -150°C.
The recent success of Pokémon GO made many people very familiar with the concept of "augmented reality": computer-generated perception blends into the real and virtual worlds. So far, these apps have largely used optical methods for motion detection. Physicists at the German Helmholtz-Zentrum Dresden-Rossendorf (HZDR) working together with colleagues at the Leibniz Institute for Solid State and Materials Research (IFW) and the Johannes Kepler University Linz (JKU) (Austria) have now developed an ultrathin electronic magnetic sensor that can be worn on skin.
In the race to build a computer that mimics the massive computational power of the human brain, researchers are increasingly turning to memristors, which can vary their electrical resistance based on the memory of past activity. Scientists at the National Institute of Standards and Technology (NIST) have now unveiled the long-mysterious inner workings of these semiconductor elements, which can act like the short-term memory of nerve cells.
DURHAM, N.C. - More than seven years after Pennsylvania officials requested that the disposal of radium-laden fracking wastewater into surface waters be restricted, a new Duke University study finds that high levels of radioactivity persist in stream sediments at three disposal sites.
The contamination is coming from the disposal of conventional, or non-fracked, oil and gas wastewater, which, under current state regulations, can still be treated and discharged to local streams.
BOSTON - With opioid overdoses now a leading cause of nonintentional death in the United States, data show most of these deaths can be traced back to an initial prescription opioid. A new study led by investigators at Beth Israel Deaconess Medical Center (BIDMC) and Harvard Medical School (HMS) sheds light on the possible link between physicians' opioid prescription patterns and subsequent abuse.
BIRMINGHAM, Ala. - Plants lack eyes and ears, but they can still see, hear, smell and respond to environmental cues and dangers -- especially to virulent pathogens. They do this with the aid of hundreds of membrane proteins that can sense microbes or other stresses.
Infant mortality rates in Texas vary dramatically even across neighboring zip codes, according to a new analysis and mapping tool from researchers at The University of Texas System and UT Health Northeast. The analysis and searchable map, which are the first of their kind in Texas, use data from Texas Vital Statistics Linked Birth and Death Records from 2011-2014.
CINCINNATI--Researchers at the University of Cincinnati (UC) College of Medicine are part of an international team that has identified how the inactive or latent form of GDF8, a signaling protein also known as myostatin responsible for limiting muscle, is activated.
Fanconi anemia is a human genetic disorder with severe effects, including an increased risk of cancer and infertility. Work in animal systems has identified many factors involved in Fanconi anemia and showed that these factors function in repair of DNA. However, despite extensive analysis in mammalian somatic cell lines, in-depth studies on the germ cells, which make egg and sperm cells, have been nearly impossible in animal model systems.
CHAPEL HILL, NC - Cystic fibrosis (CF) shortens life by making the lungs prone to repeated bacterial infections and associated inflammation. UNC School of Medicine researchers have now shown for the first time that the lungs' bacterial population changes in the first few years of life as respiratory infections and inflammation set in.
The study, published in PLoS Pathogens, offers a way to predict the onset of lung disease in children with CF and suggests a larger role for preventive therapies, such as hypertonic saline.