Catálogo de publicaciones - revistas

<jats:p>Any near-term gains in reducing extreme poverty will be maintained only if environmental sustainability is also achieved.</jats:p>

<jats:p>Biodiversity indicators used by policy-makers are underdeveloped and underinvested.</jats:p>

<jats:p> Although once thought to be largely irrelevant in the biological world, new and unexpected functions for <jats:sc>d</jats:sc> -amino acids continue to emerge. </jats:p>

<jats:p>The distribution patterns of marine microbes are shaped by dispersal on a global scale.</jats:p>

<jats:p>Cold lithium atoms undergoing strong repulsions can be driven into a state that is an analog of ferromagnetic ordering.</jats:p>

<jats:p>Insights into sediment transport at river beds can come from experiments in granular physics.</jats:p>

<jats:p>Cooperative single-photon emission from an atom ensemble will provide insights into quantum electrodynamics and applications in quantum communication.</jats:p>

<jats:p>A sloth foamy virus sequence indicates that mammals have been infected since the Cretaceous.</jats:p>

<jats:title>Corkscrew Polarizer</jats:title> <jats:p> Strong optical activity, measured in terms of a material's ability to polarize light, usually requires a material several hundred wavelengths thick. <jats:bold> Gansel <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1513" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1177031">1513</jats:related-article> , published online 20 August; see the cover) show that the tunable electromagnetic response of metamaterials may offer a route to reduce the amount of material required for strongly optically active materials. Based on the standard metamaterials design of the splitring resonator, photolithography was used to define an array of three-dimensional gold nanocorkscrews. Just a single wavelength thickness of the corkscrew design was required for a circular polarizer operating over an octave of bandwidth. </jats:p>

<jats:title>Transistors Switch onto Spin</jats:title> <jats:p> Using the spin of an electron in addition to, or instead of, the charge properties is believed to have many benefits in terms of speed, power-cost, and integration density over conventional electronic circuits. At the heart of the field of spintronics has been a proposed spin-analog of the electronic transistor, the spin field effect transistor. <jats:bold> Koo <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1515" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1173667">1515</jats:related-article> ) demonstrate the injection and detection of spin between two ferromagnetic contacts and show how the magnitude of the spin-current between the source and drain contacts can be controlled by a voltage applied to a gate. The results present an experimental realization of the concepts described for the spin-transistor. </jats:p>