Catálogo de publicaciones - revistas

<jats:p> Change in the brain's extracellular space between sleep and waking states may drive the clearance of metabolites and toxins. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="373" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1241224"> Xie <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p> Organic-inorganic hybrid semiconductors may provide the basis for the next generation of thin-film solar cells. <jats:named-content content-type="related-content"> [Also see Reports by <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/342/6156/341.full"> Stranks <jats:italic>et al.</jats:italic> </jats:ext-link> and <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/342/6156/344.full"> Xing <jats:italic>et al.</jats:italic> </jats:ext-link> ] </jats:named-content> </jats:p>

<jats:p>Rigorous testing of potential disease-modifying factors of Rett syndrome is needed to guide research findings toward clinical trials.</jats:p>

<jats:p> An ultrafine-grained nickel material is stronger and more thermally stable than previously reported materials of this kind. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="337" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1242578"> Liu <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p>The distribution of Denisovan DNA in modern human populations raises questions about where these ancient humans lived and where they interbred with modern humans.</jats:p>

<jats:p>Soft materials that embed small resonators in a host material can dampen or focus sound.</jats:p>

<jats:title>A Heady Find</jats:title> <jats:p> In the past two decades, excavations at the archaeological site at Dmanisi, Georgia, have revealed hominin fossils from the earliest Pleistocene, soon after the genus <jats:italic>Homo first</jats:italic> dispersed beyond Africa. <jats:bold> Lordkipanidze <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="326" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1238484">326</jats:related-article> ; see the cover) now describe a fossil cranium from the site. Combined with mandibular remains that had been found earlier, this find completes the first entire hominin skull from this period. </jats:p>

<jats:title>Misaligned Planets</jats:title><jats:p>Stars with multiple coplanar planets have not been seen to show misalignments between the equatorial plane of the star and the orbital plane of the planets—a diagnostic of the dynamical history of planetary systems.<jats:bold>Huber<jats:italic>et al.</jats:italic></jats:bold>(p.<jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="331" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1242066">331</jats:related-article>) analyzed the Kepler 56 planetary system, which contains a giant-sized and an intermediate-sized planet. The planets have orbits that are close to coplanar, but the planetary orbits are misaligned with the stellar equator. A third companion in a wide orbit, which could be another star or a planet, could explain the misaligned configuration.</jats:p>

<jats:title>Testing Black Holes</jats:title> <jats:p> Gravitational waves, predicted by General Relativity, are expected to be produced when very massive bodies, such as black holes, merge together. <jats:bold> Shannon <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="334" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1238012">334</jats:related-article> ) used data from the Parkes Pulsar Timing Array project to estimate the gravitational wave background produced by pairs of supermassive black holes (those with masses between 10 <jats:sup>6</jats:sup> and 10 <jats:sup>11</jats:sup> that of the Sun) in merging galaxies. The results can be used to test models of the supermassive black hole population. </jats:p>

<jats:title>Taking the Strain</jats:title> <jats:p> When heavily deformed through compressive or torsional loading, crystalline metals will generate an increasing density of defects or dislocations that effectively strengthens the metal against further deformation. However, at some stage, the fine-grained structure that forms saturates. <jats:bold> Liu <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6156" page="337" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1242578">337</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="6156" page="320" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1245794">Ramtani</jats:related-article> </jats:bold> ), show that combining the application of a very-high-rate shear deformation with high strain gradients to the surface layer of a pure sample of nickel can overcome this saturation. Instead of a three-dimensional fine-grained structure, a top layer with a two-dimensional layered structure occupied the first 80 micrometers. In addition to being stronger, this layered nickel structure was also more thermally stable. </jats:p>