The chemical makeup of wastewater generated by “hydrofracking” could cause the release of tiny particles in soils that often strongly bind heavy metals and pollutants, exacerbating the environmental risks during accidental spills, Cornell Univ. researchers have found.
Using high speed video, transmission electron microscopy, spectrometry, energy dispersive x-ray spectroscopy, and computer modeling, a Univ. of California, Berkeley graduate student has unraveled the mystery of the disco clams flashing “lips”. Most people assumed the glowing mantle was the result of bio-luminescence, but Lindsey Dougherty has found it is caused by something else entirely.
Researchers at the Joint BioEnergy Institute (JBEI) have unveiled the first glycosyltransferase clone collection specifically targeted for the study of the biosynthesis of plant cell walls. The idea behind “the JBEI GT Collection” is to provide a functional genomic resource for researchers seeking to extract the sugars in plant biomass and synthesize them into clean, green and renewable transportation fuels.
A team of scientists in Japan and New Zealand have combined lasers, nanotechnology, and neuroscience to develop a new, versatile drug delivery system. The precise timing of a femtosecond laser is used to release dopamine, a neurochemical, that is dysfunctional in Parkinson’s Disease in a controlled and repeatable manner that mimics the natural dynamic release mechanism.
Executive functions in your brain are important for making decisions in everyday life when you have to deal with sudden changes in your environment. A recent study by scientists in Singapore showed that adults who played the physics-based puzzle video game Cut the Rope regularly, for as little as an hour a day, had improved executive functions. This marks the first time video games have been shown to deliver such broad improvements.
Researchers compare the processing of biological fluid samples with searching for a needle in a haystack—only in this case, the haystack could be diagnostic samples, and the needle might be tumor cells present in just ppm concentrations. Now, a new way of processing these samples could make such detections possible in real time.
Trillions of bacteria live in and on the human body; a few species can make us sick, but many others keep us healthy by boosting digestion and preventing inflammation. Although there's plenty of evidence that these microbes play a collective role in human health, we still know very little about most of the individual bacterial species that make up these communities.
A team of researchers in California has zeroed in on the important process of “attenuation,” the way cells guard against potentially harmful overreactions to the external cues that enable them to adapt to prevailing conditions. This bimolecular mutually assured destruction (MAD) mechanism of signaling attenuation broadens our understanding of the range of mechanisms nature has evolved to enact this critical function.
Current drug delivery systems used to administer chemotherapy to cancer patients typically release a constant dose of the drug over time, but a new study challenges this "slow and steady" approach and offers a novel way to locally deliver the drugs "on demand," as reported in the Proceedings of the National Academy of Sciences.
Measurements taken at the molecular scale have, for the first time, confirmed a key property that could improve our knowledge of how the heart and lungs function. Univ. of Washington researchers have shown that a favorable electrical property is present in a type of protein found in organs that repeatedly stretch and retract, such as the lungs, heart and arteries.
The molecular building blocks that make up DNA absorb ultraviolet light so strongly that sunlight should deactivate them, yet it does not. Now, scientists at SLAC National Accelerator Laboratory have made detailed observations of a “relaxation response” that protects these molecules, and the genetic information they encode, from UV damage.
Ribosomes are responsible for the production of the wide variety of proteins that include enzymes. But until now researchers had not uncovered all of the details of how the proteins that are used to construct ribosomes are themselves produced. Biologists in California now say they have found the “missing link” in the chemical system that allows ribosomal proteins to be synthesized.
HIV-1, the virus responsible for most cases of AIDS, is a very selective virus. It doesn’t readily infect species other than its usual hosts. While this would qualify as good news for most mammals, for humans this fact has made the search for effective treatments and vaccines for AIDS that much more difficult; without an accurate animal model of the disease, researchers have had few options for clinical studies of the virus.
Think of the human body as an intricate machine whose working parts are proteins: molecules that change shape to enable our organs and tissues to perform tasks such as breathing, eating or thinking. Of the millions of proteins, 500 in the kinase family are particularly important to drug discovery. Kinases are messengers: They deliver signals that regulate and orchestrate the actions of other proteins.
Researchers from North Carolina State Univ. have developed a technique to control populations of the Australian sheep blowfly—a major livestock pest in Australia and New Zealand—by making female flies dependent upon a common antibiotic to survive.
Researchers at the Univ. of Michigan have obtained the first 3-D snapshots of the "assembly line" within microorganisms that naturally produces antibiotics and other drugs. Understanding the complete structure and movement within the molecular factory gives investigators a solid blueprint for redesigning the microbial assembly line to produce novel drugs of high medicinal value.
Lung cancer causes more deaths in the U.S. than the next three most common cancers combined, and the main reason is poor detection methods. A new device developed by a team of Israeli, American and British cancer researchers may turn the tide by both accurately detecting lung cancer and identifying its stage of progression. The breathalyzer test is embedded with a "NaNose" nanotech chip to literally "sniff out" cancer tumors.
Researchers the world over are investigating solar cells which imitate plant photosynthesis, with the goal of using sunlight and water to create synthetic fuels such as hydrogen. Scientists in Switzerland have developed this type of photoelectrochemical cell, but this one recreates a moth’s eye to drastically increase its light collecting efficiency. The cell is made of cheap raw materials: iron and tungsten oxide.
Researchers in Australia have discovered how algae that survive in very low levels of light are able to switch on and off a weird quantum phenomenon that occurs during photosynthesis. The function in the algae of this quantum effect, known as coherence, remains a mystery, but it is thought it could help them harvest energy from the sun much more efficiently.
From allowing our eyes to see, to enabling green plants to harvest energy from the sun, photochemical reactions are ubiquitous and critical to nature. Photochemical reactions also play essential roles in high technology. Using photochemical reactions to our best advantage requires a deep understanding of the interplay between the electrons and atomic nuclei within a molecular system after that system has been excited by light.
Nanoengineers at UC San Diego have developed a nanoshell to protect foreign enzymes used to starve cancer cells as part of chemotherapy. Enzymes are naturally smart machines that are responsible for many complex functions and chemical reactions in biology. However, despite their huge potential, their use in medicine has been limited by the immune system, which is designed to attack foreign intruders.
A biological detection technology developed by Lawrence Livermore National Laboratory scientists can detect bacterial pathogens in the wounds of U.S. soldiers that have previously been missed by other technologies. This advance may, in time, allow an improvement in how soldiers' wounds are treated.
Water is thought to be embedded in the moon’s rocks or, if cold enough, “stuck” on their surfaces. It’s predominantly found at the poles. But scientists probably won’t find it intact on the sunlit side. New research at indicates that ultraviolet photons emitted by the sun likely cause water molecules to either quickly desorb or break apart.
How does a stem cell decide what path to take? In a way, it’s up to the wisdom of the crowd. The DNA in a pluripotent stem cell is bombarded with waves of proteins whose ebb and flow nudge the cell toward becoming blood, bone, skin or organs. A new theory by scientists at Rice Univ. shows the cell’s journey is neither a simple step-by-step process nor all random.
Nanopores may one day lead a revolution in DNA sequencing. By sliding DNA molecules one at a time through tiny holes in a thin membrane, it may be possible to decode long stretches of DNA at lightning speeds. Scientists, however, haven’t quite figured out the physics of how polymer strands like DNA interact with nanopores.