Catálogo de publicaciones - revistas

<jats:p> Surface diffusion on frozen polymer glasses is influenced by the surface dynamics of the glass itself. <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="6174" page="994" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1244845"> Chai <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p>Persistent cool conditions in the eastern tropical Pacific may explain the current global warming “hiatus.”</jats:p>

<jats:p> How does a certain pattern of vibration in the air reliably represent a meaningful speech sound? <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="6174" page="1006" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1245994"> Mesgarani <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p>A shrub tundra refugium on the Bering land bridge may have played a pivotal role in the peopling of the Americas.</jats:p>

<jats:p>Models of nanoparticle assembly can help explain aspects of the inverted structure that forms because of induced change in tubulin protein shape.</jats:p>

<jats:p> A mechanism that senses antigen affinity shifts cell signaling and leads to qualitatively different inflammatory responses. <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="6174" page="1021" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1246976"> Suzuki <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p> A monthly roundup of recent news and projects of <jats:italic>Science</jats:italic> 's publisher, the American Association for the Advancement of Science. </jats:p>

<jats:title>Ordering Cosmic Rays</jats:title> <jats:p> Earth and other planets are constantly bombarded by cosmic rays (charged particles from the cosmos). The flux of very-high-energy cosmic rays varies according to where we look in the sky. <jats:bold> Schwadron <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="6174" page="988" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1245026">988</jats:related-article> , published online 13 February) show that recent measurements of the local interstellar parameters by NASA's Interstellar Boundary Explorer satellite are consistent with observed cosmic ray anisotropies at tera–electron volt energies, implying that local interstellar conditions play a role in ordering very-high-energy cosmic rays in our cosmic vicinity. </jats:p>

<jats:title>A Boost for Bismuth Vanadate</jats:title> <jats:p> In theory, given its light-absorption spectrum, bismuth vanadate should be an effective photoanode for solar water-splitting. However, in prior studies, few of the “holes” generated upon photoexcitation have persisted long enough to strip electrons from water. <jats:bold>Kim and Choi</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6174" page="990" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1246913">990</jats:related-article> , published online 13 February) now show that the use of a hydrophobic vanadium source in the semiconductor's synthesis results in a high-surface-area morphology with substantially enhanced hole lifetimes. Deposition of two successive catalyst layers enhanced the proportion of holes that reacted with water at the surface, thereby raising the efficiency of the oxygen evolution reaction. </jats:p>

<jats:title>Polymer Film Behavior</jats:title> <jats:p> An ongoing debate in the understanding of the behavior of thin-film glassy polymers is whether there is nanoconfinement of large molecules or enhanced mobility near a free surface. <jats:bold> Chai <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="6174" page="994" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1244845">994</jats:related-article> ; see the Perspective by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6174" page="975" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1248113"> <jats:bold> Chen <jats:italic>et al.</jats:italic> </jats:bold> </jats:related-article> ) prepared polymer films with a sharp step in the profile by depositing broken film fragments onto a uniform underlay. Atomic force microscopy revealed changes to the overall film profile with time at various temperatures. A transition was observed from localized motions to relaxation of the entire film at a temperature close to that of the bulk glass transition temperature. </jats:p>