Catálogo de publicaciones - revistas

<jats:p>Despite technological advances, volcano monitoring around the world is woefully incomplete.</jats:p>

<jats:p>A process based on laser-converted graphene is used to fabricate high-value energy storage material.</jats:p>

<jats:p>A protein that controls nucleic acid metabolism affects the balance between HIV infection and immune responses.</jats:p>

<jats:p>A method based on correlated measurements of electrons and ions shows that electrons of large molecules can be set into motion by strong laser fields.</jats:p>

<jats:p>The seminal work of this geneticist and microbiologist on bacteriophage contributed importantly to our understanding of fundamental genetic processes.</jats:p>

<jats:title>Ancient Human Migration</jats:title> <jats:p> During the past 100,000 years or so, modern humans migrated from Africa into Eurasia, completely replacing existing populations of Neandertals by about 20,000 years ago. This occurred as the climate cooled toward a glacial maximum. <jats:bold>Stewart and Stringer</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1317" related-article-type="in-this-issue" vol="335" xlink:href="10.1126/science.1215627">1317</jats:related-article> ) review some of the recent evidence for how this demographic transition occurred. Data from ancient genomes of Neandertals and Denisovans coupled with our improved understanding of the role of refugia in driving evolution during the Ice Ages suggest that such refugia were important in the pace and pattern of change. </jats:p>

<jats:p>High-speed observations reveal how rapid changes in cell shape powerfully eject fern spores.</jats:p>

<jats:title>Quantum Hall Meets Metamaterial</jats:title> <jats:p> Controlling and tuning light-matter interaction is crucial for fundamental studies of cavity quantum electrodynamics and for applications in classical and quantum devices. <jats:bold> Scalari <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="1323" related-article-type="in-this-issue" vol="335" xlink:href="10.1126/science.1216022">1323</jats:related-article> ) describe a system comprising an array of metamaterial split-ring resonators and a series of two-dimensional electronic gases (2DEG) formed in GaAs quantum wells. In a magnetic field, the electrons in the 2DEG performed cyclotron orbits and formed Landau levels. Strong coupling was observed between photon and magnetic cyclotron modes, producing a tunable semiconductor system for studying the light-matter interaction of two-level systems. </jats:p>

<jats:title>Infrared Route to Graphene Electrodes</jats:title> <jats:p> Electrochemical capacitors can deliver large amounts of power quickly, but have limited energy storage because only the surface regions of electrodes can store charge. Graphene represents an alternative to activated carbon electrodes because of their high conductivity and surface area, but graphene sheets tend to reassociate and lose surface area. <jats:bold> El-Kady <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="1326" related-article-type="in-this-issue" vol="335" xlink:href="10.1126/science.1216744">1326</jats:related-article> ; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6074" journal-id-type="" page="1312" related-article-type="in-this-issue" vol="335" xlink:href="10.1126/science.1219134">Miller</jats:related-article> </jats:bold> ) show that graphite oxide sheets can be converted by infrared laser irradiation into porous graphene sheets that are flexible, robust, and highly conductive. </jats:p>

<jats:title>Laying It on Thick</jats:title> <jats:p> The growth of one layered material onto a second lies at the heart of many electronic devices. However, if there is a lattice mismatch between the two materials, strains develop in the overgrowth material leading to bowing and cracking. <jats:bold> Falub <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="1330" related-article-type="in-this-issue" vol="335" xlink:href="10.1126/science.1217666">1330</jats:related-article> ; see the cover) patterned Si substrates into a series of pillars onto which they grew a germanium layer. The germanium initially coated the top of each silicon pillar but then widened as the layer thickened, leading to thick, crack-free germanium films. </jats:p>