Catálogo de publicaciones - revistas

<jats:title>Thought for food</jats:title> <jats:p> To have any hope of meeting the central goal of the Paris Agreement, which is to limit global warming to 2°C or less, our carbon emissions must be reduced considerably, including those coming from agriculture. Clark <jats:italic>et al.</jats:italic> show that even if fossil fuel emissions were eliminated immediately, emissions from the global food system alone would make it impossible to limit warming to 1.5°C and difficult even to realize the 2°C target. Thus, major changes in how food is produced are needed if we want to meet the goals of the Paris Agreement. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6517" page="705" related-article-type="in-this-issue" vol="370">705</jats:related-article> </jats:p>

<jats:title>Layering the charge</jats:title> <jats:p> Layered metal oxides such as lithium cobalt oxide have attracted great attention for rechargeable batteries. In lithium cells, only the octahedral structure forms, but in sodium cells, trigonal prismatic structures are also possible. However, there is a lack of understanding about how to predict and control the formation of each structure. Zhao <jats:italic>et al.</jats:italic> used the simple properties of ions, namely their charge and their radius appropriately weighted by stoichiometry, to determine whether sodium in the interlayers between the transition metal or other ion-oxide layers remain octahedral rather than switching over to trigonal prismatic coordination. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6517" page="708" related-article-type="in-this-issue" vol="370">708</jats:related-article> </jats:p>

<jats:title>Ecological “big data”</jats:title> <jats:p> Human activities are rapidly altering the natural world. Nowhere is this more evident, perhaps, than in the Arctic, yet this region remains one of the most remote and difficult to study. Researchers have increasingly relied on animal tracking data in these regions to understand individual species' responses, but if we want to understand larger-scale change, we need to integrate our understanding across species. Davidson <jats:italic>et al.</jats:italic> introduce an open-source data archive that currently hosts more than 15 million location data points across 96 species and use it to show distinct climate change responses across species. Such ecological “big data” can lead to a wider understanding of change. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6517" page="712" related-article-type="in-this-issue" vol="370">712</jats:related-article> </jats:p>

<jats:title>Calving cousins</jats:title> <jats:p> Walczak <jats:italic>et al.</jats:italic> report that increases in Pacific Ocean ventilation and periods of rapid production of icebergs from the Cordilleran Ice Sheet during the last glacial period preceded episodic iceberg discharges into the Atlantic Ocean (see the Perspective by Jaeger and Shevenell). Marine sediments from the Gulf of Alaska show that increases in vertical mixing of the ocean there correspond with intense iceberg calving from the ice sheet that covered much of high-latitude western North America and that these changes occurred before the analogous Heinrich events in the North Atlantic. Thus, these Pacific climate system reorganizations may have been an early part of a cascade of dynamic climate events with global repercussions. </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="6517" page="716" related-article-type="in-this-issue" vol="370" xlink:href="10.1126/science.aba7096">716</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6517" page="662" related-article-type="in-this-issue" vol="370" xlink:href="10.1126/science.abe8461">662</jats:related-article> </jats:p>

<jats:title>Untangling the genetics of plasticity</jats:title> <jats:p> The common buckeye butterfly, <jats:italic>Junonia coenia</jats:italic> , exhibits plastic coloration; it has two color morphs, light tan and dark red, that depend on day length and temperature. By selecting for more and less color plasticity, van der Burg <jats:italic>et al.</jats:italic> generated butterfly lines that were used to map the genetic variants that underlie differential coloration. Genome-wide analysis and RNA sequencing identified the genes most likely to be associated with the differences in color plasticity. Inactivation of genes with CRISPR–Cas9 identified three genes that affected the red phenotype, and other techniques identified cis-regulatory, noncoding genomic variants that were correlated with coloration. From these results, the authors were able to model how genetically encoded plasticity and assimilation of the plastic trait likely evolved. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6517" page="721" related-article-type="in-this-issue" vol="370">721</jats:related-article> </jats:p>

<jats:title>Locking down the SARS-CoV-2 spike</jats:title> <jats:p> Many efforts to develop therapies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are focused on the spike (S) protein trimer that binds to the host receptor. Structures of trimeric S protein show its receptor-binding domain in either an up or a down conformation. Toelzer <jats:italic>et al.</jats:italic> produced SARS-CoV-2 S in insect cells and determined the structure by cryo–electron microscopy. In their dataset, the closed form was predominant and was stabilized by binding linoleic acid, an essential fatty acid. A similar binding pocket appears to be present in previous highly pathogenic coronaviruses, and past studies suggested links between viral infection and fatty acid metabolism. The pocket could be exploited to develop inhibitors that trap S protein in the closed conformation. </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="6517" page="725" related-article-type="in-this-issue" vol="370" xlink:href="10.1126/science.abd3255">725</jats:related-article> </jats:p>

<jats:p>Telemedicine comes in many shapes and sizes and offers many advantages over the traditional healthcare visit, but until recently, it was largely underutilized. The COVID-19 pandemic quickly changed that—only time will tell if telemedicine's new popularity will last.</jats:p>