Catálogo de publicaciones - revistas

<jats:title>Structured solvents near nanoparticles</jats:title> <jats:p> The physical properties and reactivity of nanoparticles in solution depend not only on their surface termination but also on changes in solvent ordering caused by the presence of the interface created by the nanoparticle. Zobel <jats:italic>et al.</jats:italic> used x-ray scattering to study solvent ordering for a variety of metal and metal-oxide nanoparticles in a variety of polar solvents (alcohols) and a nonpolar solvent (n-hexane). They observed layers of enhanced ordering near the nanoparticle surface relative to the bulk solvent. These trends were largely independent of surface chemistry, such as changing the surface groups from hydroxyls to carboxylates. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6219" page="292" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.1261412">292</jats:related-article> </jats:p>

<jats:title>Nailing down the topology of a semimetal</jats:title> <jats:p> Topological insulators are exotic materials that have a conducting surface state that can withstand certain types of material imperfection. Theoreticians have predicted a different kind of surface state in related three-dimensional topological Dirac semimetals, which do not have an energy gap in the band structure of the bulk. Xu <jats:italic>et al.</jats:italic> used photoemission spectroscopy to map out the band structure of the material Na <jats:sub>3</jats:sub> Bi and detected the predicted surface state. Their results may lead to further insights into the physics of topological matter. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6219" page="294" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.1256742">294</jats:related-article> </jats:p>

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>

<jats:p>On this week's show: The energetics of high-altitude bird migration and a roundup of daily news stories.</jats:p>

<jats:p>In this second of three special supplements, herbal genomics as a novel approach for revolutionizing research on, and ultimately use of, traditional herbal medicines and other materia medica, as well as advances in their quality control and standardization, is highlighted. A prominent focus is the U.S. Food and Drug Administration’s practical framework for developing botanicals (including traditional medicines) into new drugs based on the same standards as small molecule drugs. The application of mechanistic studies to drug discovery and development from traditional therapies is discussed, with an emphasis on preclinical toxicology assessments, pharmacovigilance, comparative effectiveness research, and the practice of "P4" medicine, particularly in the context of influenza, ischemic heart disease, stroke, and cancer.</jats:p> <jats:p> This special supplement brought to you by the <jats:bold>Science</jats:bold> /AAAS Custom Publishing Office. </jats:p>

<jats:p>In this second of three special supplements, herbal genomics as a novel approach for revolutionizing research on, and ultimately use of, traditional herbal medicines and other materia medica, as well as advances in their quality control and standardization, is highlighted. A prominent focus is the U.S. Food and Drug Administration’s practical framework for developing botanicals (including traditional medicines) into new drugs based on the same standards as small molecule drugs. The application of mechanistic studies to drug discovery and development from traditional therapies is discussed, with an emphasis on preclinical toxicology assessments, pharmacovigilance, comparative effectiveness research, and the practice of "P4" medicine, particularly in the context of influenza, ischemic heart disease, stroke, and cancer.</jats:p> <jats:p> This special supplement brought to you by the <jats:bold>Science</jats:bold> /AAAS Custom Publishing Office. </jats:p>