Catálogo de publicaciones - revistas

<jats:title>Recombination revealed by mapping tails</jats:title> <jats:p> Meiosis is a specialized double cell division that generates haploid gametes from diploid parent cells. Meiotic recombination between homologous chromosomes ensures the proper segregation of chromosomes to the daughter cells. Mimitou <jats:italic>et al.</jats:italic> carried out a genome-wide survey of resection of the ends of DNA double strand breaks in yeast. Resection generates single-stranded tails that are vital for meiotic recombination. The Tel1 kinase promoted initiation of resection. Nucleosomes, which normally package DNA, needed to be disassembled to allow rapid and efficient resection. </jats:p> <jats:p> Science, this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6320" page="40" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aak9704">40</jats:related-article> </jats:p>

<jats:title>Hearing a volcanic plume</jats:title> <jats:p> Monitoring remote eruptions—such as that of Pavlof Volcano, Alaska, in 2016—is challenging. Fee <jats:italic>et al.</jats:italic> found that the height of the ash plume during the Pavlof eruption could be inferred from sound waves detected by distant infrasound arrays and measurements of seismic tremor. The use of sound waves for monitoring is uncommon but well suited for remote eruptions, especially when we lack visual or satellite observations. </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="6320" page="45" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah6108">45</jats:related-article> </jats:p>

<jats:title>Whither the density in DFT calculations?</jats:title> <jats:p> The continuing development of density functional theory (DFT) has greatly expanded the size and complexity of molecules amenable to computationally tractable simulation. The conventional metric of success for new functionals has been the accuracy of their calculated energies. Medvedev <jats:italic>et al.</jats:italic> examined how well these functionals calculate electron density across a series of neutral and cationic atoms (see the Perspective by Hammes-Schiffer). Although historically the accuracies of energy and density have improved in tandem, certain recent functionals have sacrificed fidelity to the true density. </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="6320" page="49" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah5975">49</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6320" page="28" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal3442">28</jats:related-article> </jats:p>

<jats:title>Going cold with Bismuth</jats:title> <jats:p> Many elemental metals, such as lead and aluminum, become superconducting at low temperatures. Bismuth, a semimetal with very low carrier density, stays nonsuperconducting down to 10 mK. Prakash <jats:italic>et al.</jats:italic> performed tricky magnetization measurements to show that pure bulk bismuth does undergo the superconducting transition at a tiny temperature of about 0.5 mK (see the Perspective by Behnia). Because bismuth does not fit neatly into the standard picture of superconductivity, further theoretical work is necessary to explain the findings. </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="6320" page="52" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aaf8227">52</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6320" page="26" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal2516">26</jats:related-article> </jats:p>

<jats:title>Water ice beneath the surface of Ceres</jats:title> <jats:p> The dwarf planet Ceres in the inner solar system is thought to have a crust made of a mixture of rock and ice. Prettyman <jats:italic>et al.</jats:italic> used neutron and gamma-ray spectroscopy from the Dawn spacecraft to peer below Ceres' surface and map the subsurface composition. They found evidence for water ice across the dwarf planet, with water making up a larger fraction of the material near the poles than around the equator. Together with their measurements of other elements, these results aid our understanding of Ceres' composition and constrain models of its formation. </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="6320" page="55" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah6765">55</jats:related-article> </jats:p>

<jats:title>Trapping polymers to improve flexibility</jats:title> <jats:p> Polymer molecules at a free surface or trapped in thin layers or tubes will show different properties from those of the bulk. Confinement can prevent crystallization and oddly can sometimes give the chains more scope for motion. Xu <jats:italic>et al.</jats:italic> found that a conducting polymer confined inside an elastomer—a highly stretchable, rubber-like polymer—retained its conductive properties even when subjected to large deformations (see the Perspective by Napolitano). </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="6320" page="59" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah4496">59</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6320" page="24" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal4113">24</jats:related-article> </jats:p>