Catálogo de publicaciones - revistas

<jats:title>Past human influences on Amazonian forest</jats:title> <jats:p> The marks of prehistoric human societies on tropical forests can still be detected today. Levis <jats:italic>et al.</jats:italic> performed a basin-wide comparison of plant distributions, archaeological sites, and environmental data. Plants domesticated by pre-Columbian peoples are much more likely to be dominant in Amazonian forests than other species. Furthermore, forests close to archaeological sites often have a higher abundance and richness of domesticated species. Thus, modern-day Amazonian tree communities across the basin remain largely structured by historical human use. </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="6328" page="925" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal0157">925</jats:related-article> </jats:p>

<jats:title>Turning colloidal gold into clathrates</jats:title> <jats:p> Clathrates contain extended pore structures that can trap other molecules. Lin <jats:italic>et al.</jats:italic> created colloidal analogs of clathrates in which bipyramidal gold nanoparticles functionalized with DNA molecules assembled into polyhedral clusters to create open-pore structures (see the Perspective by Samanta and Klajn). These clathrate colloidal crystals exhibit extraordinary structural complexity and substantially broaden both the scope and the possibilities provided by DNA-inspired methodologies. </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="6328" page="931" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal3919">931</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6328" page="912" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam7927">912</jats:related-article> </jats:p>

<jats:title>Boron choreographs a double reaction</jats:title> <jats:p> In the widely used Suzuki coupling reaction, boron surrenders an olefinic substituent to a metal catalyst en route to carbon-carbon bond formation. Kischkewitz <jats:italic>et al.</jats:italic> report a metal-free alternative pathway, wherein the boron stays bound to one end of the olefin while a carbon radical attacks the other end. Charge transfer then prompts migration of an alkyl or aryl group from the boron to form a second carbon-carbon bond. The boron can subsequently be displaced, generating a versatile array of alcohols, lactones, and quaternary carbon centers from simple precursors. </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="6328" page="936" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal3803">936</jats:related-article> </jats:p>

<jats:title>An on-chip microwave source</jats:title> <jats:p> The active elements of superconducting quantum circuits are typically addressed and controlled using pulses of microwave radiation. The microwaves are usually generated externally and coupled into the circuitry, resulting in rather bulky systems. Cassidy <jats:italic>et al.</jats:italic> developed an on-chip source of microwaves by using a superconducting Josephson junction inserted in a high-quality microwave cavity. The integrated version should enhance the control capability for manipulating miniaturized quantum circuits. </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="6328" page="939" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah6640">939</jats:related-article> </jats:p>

<jats:title>Turning up the mantle temperature</jats:title> <jats:p> The temperature at which Earth's mantle begins to melt is a long-standing question in geology. Sarafian <jats:italic>et al.</jats:italic> present a clever set of experiments to determine the impact of small amounts of water on the melting temperature of mantle rock (see the Perspective by Asimow). This allowed them to reinterpret geophysical observations of melting in the mantle and revise estimates of mantle temperature upward. A hotter mantle has a multitude of implications for mantle melting and geodynamic processes. </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="6328" page="942" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aaj2165">942</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6328" page="908" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam7807">908</jats:related-article> </jats:p>

<jats:title>Pulling apart protein unfolding</jats:title> <jats:p> Elucidating the details of how complex proteins fold is a longstanding challenge. Key insights into the unfolding pathways of diverse proteins have come from single-molecule force spectroscopy (SMFS) experiments in which proteins are literally pulled apart. Yu <jats:italic>et al.</jats:italic> developed a SMFS technique that could unfold individual bacteriorhodopsin molecules in a native lipid bilayer with 1-µs temporal resolution (see the Perspective by Müller and Gaub). The technique delivered a 100-fold improvement over earlier studies of bacteriorhodopsin and revealed many intermediates not seen before. The authors also observed unfolding and refolding transitions between intermediate states. </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="6328" page="945" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aah7124">945</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6328" page="907" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam8370">907</jats:related-article> </jats:p>

<jats:title>A reliable and efficient DNA storage architecture</jats:title> <jats:p>DNA has the potential to provide large-capacity information storage. However, current methods have only been able to use a fraction of the theoretical maximum. Erlich and Zielinski present a method, DNA Fountain, which approaches the theoretical maximum for information stored per nucleotide. They demonstrated efficient encoding of information—including a full computer operating system—into DNA that could be retrieved at scale after multiple rounds of polymerase chain reaction.</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="6328" page="950" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aaj2038">950</jats:related-article> </jats:p>