Learn More
The primary aim of this article is to provide an overview of perfluoroalkyl and polyfluoroalkyl substances (PFASs) detected in the environment, wildlife, and humans, and recommend clear, specific, and descriptive terminology, names, and acronyms for PFASs. The overarching objective is to unify and harmonize communication on PFASs by offering terminology for(More)
Perfluorinated acids (PFAs) are ubiquitously found in water and biota, including remote regions such as the High Arctic. Under environmental conditions, PFAs exist mainly as anions and are not expected to be subject to long-range atmospheric transport in the gas phase. Fluorinated telomer alcohols (FTOHs) are volatile and can be atmospherically oxidized to(More)
OBJECTIVE To clarify the use of blood alcohol concentration (BAC) in the emergency department resuscitation room, by comparing it with a subsequent alcohol questionnaire and by surveying patients' attitudes to BAC testing. DESIGN Observational study. PARTICIPANTS 273 resuscitation room patients at St Mary's Hospital, Paddington between August 2005 and(More)
Natural language understanding involves the simultaneous consideration of a large number of different sources of information. Traditional methods employed in language analysis have focused on developing powerful formalisms to represent syntactic or semantic structures along with rules for transforming language into these formalisms. However, they make use(More)
—We describe a comprehensive framework for text understanding , based on the representation of context. It is designed to serve as a representation of semantics for the full range of in-terpretive and inferential needs of general natural language processing. Its most distinctive feature is its uniform representation of the various simple and independent(More)
Vertebrate genomes are mosaics of isochores, defined as long (>100 kb) regions with relatively homogeneous within-region base composition. Birds and mammals have more GC-rich isochores than amphibians and fish, and the GC-rich isochores of birds and mammals have been suggested to be an adaptation to homeothermy. If this hypothesis is correct, all(More)
A visible and near-IR spectral study is presented for a translucent smooth polymer sheet in which dopant particles are clear polymer with a refractive index close to that of the clear polymer host. Diffuse, specular, and total reflectance and transmittance and absorptance as a function of sheet thickness and dopant levels approach ideal behavior for(More)