Catálogo de publicaciones - revistas

<jats:title>Building a gate to the nucleus</jats:title> <jats:p> Nuclear pore complexes form a gateway between the cytoplasm and the nucleus (see the Perspective by Ullman and Powers). Stuwe <jats:italic>et al.</jats:italic> combined structural, biochemical, and functional analyses to elucidate the architecture of a six-protein complex that makes up the inner ring of the fungal nuclear pore. This includes a central trimeric complex homologous to the Nup62 complex found in metazoans that is incorporated into the nuclear pore inner-ring complex. Chug <jats:italic>et al.</jats:italic> report the structure of the metazoan trimeric Nup62 complex. Neither study supports a model in which the pore can dilate and constrict. Instead they suggest a rigid pore in which flexible domains called FG repeats fill the channel and form a barrier that can be traversed by receptors that carry cargos across. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue pp. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6256" page="56" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac9176">56</jats:related-article> and <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6256" page="106" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac7420">106</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6256" page="33" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aad3797">33</jats:related-article> </jats:p>

<jats:title>An exoplanet extracted from the bright</jats:title> <jats:p> Direct imaging of Jupiter-like exoplanets around young stars provides a glimpse into how our solar system formed. The brightness of young stars requires the use of next-generation devices such as the Gemini Planet Imager (GPI). Using the GPI, Macintosh <jats:italic>et al.</jats:italic> discovered a Jupiter-like planet orbiting a young star, 51 Eridani (see the Perspective by Mawet). The planet, 51 Eri b, has a methane signature and is probably the smallest exoplanet that has been directly imaged. These findings open the door to understanding solar system origins and herald the dawn of a new era in next-generation planetary imaging. </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="6256" page="64" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac5891">64</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6256" page="39" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aad0904">39</jats:related-article> </jats:p>

<jats:title>Making better small contacts</jats:title> <jats:p> Semiconducting single-walled carbon nanotubes have potential size and conductivity advantages over silicon for making smaller transistors. However, as metal electrical contacts decrease in size, the associated resistance increases to impractical values. Cao <jats:italic>et al.</jats:italic> reacted molybdenum films with semiconducting carbon nanotubes to create a carbide contact. The resistance of these contacts remained low even for 10-nm-scale contacts. </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="6256" page="68" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac8006">68</jats:related-article> </jats:p>

<jats:title>Transient polymer links are better</jats:title> <jats:p> Very long polymer molecules elongate in shearing flows. This ordering of the chains lowers the viscosity of small-molecule solvents. The chains also reduce the dangers of misting during explosive spreading of the solvents. However, the long polymer chains degrade during normal fuel handling and clog pumping equipment. Wei <jats:italic>et al.</jats:italic> used telechelic polymers—short chains with reactive end groups—to form extremely long chains in organic solvents (see the Perspective by Jaffe and Allam). These reformable polymers offer the potential for better fuel safety without the drawbacks of covalently bonded long-chain polymers. </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="6256" page="72" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aab0642">72</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6256" page="32" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac9827">32</jats:related-article> </jats:p>