Archaeologists continue to debate the reasons for the collapse of many Central American cities and states, from Teotihuacan in Mexico to the Yucatan Maya, and climate change is considered one of the major causes. A new study sheds light on this question, providing evidence that a prolonged period of below-average rainfall was partly responsible for the abandonment of one such city, Cantona.
The February issue of Chromatography Techniques features a cover story on accelerator mass spectrometry, and other features on GC analysis in fracking locations, new USP methods, NIR spec analysis in tablet testing, and more!
Updates to the allowed limits of HPLC and GC parameters enable higher-speed analysis of USP methods than ever before.
Dual-column gas chromatography meets the needs of the environmental testing industry by providing fast, accurate separation of multiple halogenated compound classes.
Multiple gas chromatography methods are being deployed to monitor a suite of fracking-related contaminants that may be present in drinking water.
Accelerator mass spectrometry (AMS) is an analytical technique for measuring isotope ratios with high selectivity, sensitivity and precision. Initially developed more than 75 years ago by Robert Cornog and Luis Alvarez at the Univ. of California, Berkeley, there are now more than 110 AMS systems in 28 countries around the world, mostly at government and university labs, but a few at private companies as well.
As illustrated by experimental results, imaging in high-magnification mode is faster and results in more spectral and spatial detail.
Near-infrared spectroscopy reduces the amount of time and work needed to test sustained-release tablets, and ensures nondestructive, reliable analysis.
Sites where DNA is damaged may cause a molecule that slides along the DNA strand to scan for damage to slow on its patrol, delaying it long enough to recognize and initiate repair. The find suggests that the delay itself may be the key that allows the protein molecule to find its target.
A potential avenue to quantum computing currently generating quite the buzz in the high-tech industry is valleytronics, in which information is coded based on the wavelike motion of electrons moving through certain 2-D semiconductors. Now, a promising new pathway to valleytronic technology has been uncovered.
DNA testing on hundreds of bottles of store-brand herbal supplements sold as treatments for everything from memory loss to prostate trouble found that four out of five contained none of the herbs on the label. Instead, they were packed with cheap fillers such as wheat, rice, beans or houseplants.
Alzheimer's disease is difficult to spot in its early stages, has no effective treatment and no known cure. But, researchers are hopeful their work will make the most common form of dementia easier to diagnose and treat. Their research indicates that iron deficiency may play a significant part in the development of Alzheimer's.
<p>An international team of scientists has discovered the greatest absence of evolution ever reported— a type of deep-sea microorganism that appears not to have evolved over more than 2 billion years. But the researchers say that the organisms’ lack of change actually supports Charles Darwin’s theory of evolution.</p>
VICI’s newest member of the Pulsed Discharge Detector (PDD) family is also the smallest and thriftiest. The miniPDD uses about one fifth (20%) the amount of helium as the VICI?Valco D-3 and D-4 versions, giving up only a bit of sensitivity and dynamic range in return.
SPECTRO Analytical Instruments’ ARCOS high-resolution ICP/OES spectrometer features the fast and convenient selection of axial plasma or radial plasma observation in a single instrument—without any optical compromise. Designed for use in the most demanding elemental analysis applications in industry, science, and academia, the spectrometer features improved sensitivity, stability and precision, while lowering operating costs with the introduction of innovative components, unique capabilities and optimum flexibility.
Restek is now using universally recognized GHS labeling for its reference standards. GHS, or the Globally Harmonized System of Classification and Labeling of Chemicals, is a set of provisions for hazard classification and communication developed by the United Nations.
IONICON PTR-TOF systems can measure trace gas samples in real-time with a high mass resolving power. Now, the fastGC module adds an optional chemical pre-separation step before the analysis.
The omniDOC series of gel documentation and analysis systems from Cleaver Scientific provides researchers with a quick, simple and flexible solution for their gel documentation needs in a compact and affordable benchtop unit. Combining high performance and cutting-edge features, the series provides an easy-to-use, yet powerful gel imaging system that satisfies the needs of most laboratories.
To ensure against contamination of the food chain, fast and cost-effective sample preparation is essential for the analysis of mycotoxins. The clean-up process of mycotoxins can be optimized using Agilent Bond Elut Mycotoxin, a solid phase extraction (SPE) sorbent that cleans up food extracts for improved trichothecene and zearalenone analysis.
Ribbons of graphene with nanometric widths are emerging as interesting electronic components. But, because of the great variability of electronic properties upon minimal changes in the structure of these nanoribbons, control on an atomic level is an indispensable requirement to make the most of all their potential. Now, scientists have managed, with atomic precision, to create nanostructures combining graphene ribbons of varying widths.
Nanodiamonds possess the crystalline structure of diamonds but their properties diverge considerably from those of their big brothers, because their surfaces play a dominant role in comparison to their extremely small volumes. Suspended in aqueous solutions, they could function as taxis for active substances in biomedical applications, for example, or be used as catalysts for splitting water.