Catálogo de publicaciones - revistas

<jats:title> Flowing CO <jats:sub>2</jats:sub> boosts a molecular catalyst </jats:title> <jats:p> Molecular electrocatalysts for CO <jats:sub>2</jats:sub> reduction have often appeared to lack sufficient activity or stability for practical application. Ren <jats:italic>et al.</jats:italic> now show that design of the surrounding electrochemical cell can substantially boost both features. They directly exposed a known molecular catalyst, cobalt phthalocyanine, to gaseous CO <jats:sub>2</jats:sub> in a flow cell architecture, rather than an aqueous electrolyte. The configuration accommodated current densities exceeding 150 milliamperes per square centimeter, with longevity limited by local proton concentration rather than catalyst stability. </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="6451" page="367" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax4608">367</jats:related-article> </jats:p>

<jats:title>Underwater melting</jats:title> <jats:p> How fast does warm ocean water melt glaciers that terminate in the sea? That question is central to understanding how fast ice sheets may lose mass, and thus how fast sea level will rise, in response to global warming, but there are few data about the process. Sutherland <jats:italic>et al.</jats:italic> used repeat multibeam sonar surveys to observe an Alaskan subsurface tidewater glacier face to create a time series of its melting and calving patterns. They observed melt rates up to a hundred times larger than those predicted by theory, observations that compel us to reevaluate predictions of such ice loss. </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="6451" page="369" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax3528">369</jats:related-article> </jats:p>

<jats:title>Beam steering with a metasurface</jats:title> <jats:p> Metasurfaces have been designed that function as many passive optical elements. Shaltout <jats:italic>et al.</jats:italic> created a time-dependent active element. A frequency-comb light beam (a light source consisting of a broad range of evenly spaced wavelengths) interacted with a specially designed passive metasurface so that the beam could be rapidly (&lt;8 picoseconds) swept over a broad angle (25°). Such beam-steering capability could directly affect augmented and virtual reality systems. </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="6451" page="374" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax2357">374</jats:related-article> </jats:p>

<jats:title>Mind the angle</jats:title> <jats:p> Interplay between real- and momentum-space properties of materials can lead to exotic phenomena. Suzuki <jats:italic>et al.</jats:italic> studied electrical transport in the presence of a magnetic field in cerium-aluminum-germanium, a Weyl semimetal that also harbors magnetism (see the Perspective by Hassinger and Meng). As they varied the orientation of the applied field, they noticed spikes of resistivity sharply centered around the high symmetry axes of the material. The spikes were a consequence of the small overlap of Fermi surfaces—which “live” in momentum space—on either side of magnetic domain walls, which occur in real space. This extreme angular sensitivity may be useful in practical applications. </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="6451" page="377" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aat0348">377</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6451" page="324" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aay3059">324</jats:related-article> </jats:p>

<jats:title>Adding to the RNA editing toolbox</jats:title> <jats:p> A previously developed RNA editing system called REPAIR can base edit A to I in RNA by fusing the adenine deaminase domain of ADAR2 with catalytically dead CRISPR-Cas13. Using directed evolution, Abudayyeh <jats:italic>et al.</jats:italic> demonstrated that the ADAR2 deaminase domain can be relaxed to accept other bases. This resulted in cytidine deamination activity, expanding the RNA editing toolbox for C-to-U conversion. This system, referred to as RNA Editing for Specific C-to-U Exchange (RESCUE), can edit on endogenous transcripts and enable modulation of posttranslational protein modification such as phosphorylation. </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="6451" page="382" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax7063">382</jats:related-article> </jats:p>

<jats:title>Ceramides in focus</jats:title> <jats:p> Excess calorie intake can ultimately lead to a metabolic syndrome that interferes with fat or lipid metabolism. There are many different types of lipids, and it has been widely debated which are the true culprits underlying metabolic disorders. Chaurasia <jats:italic>et al.</jats:italic> report that ceramides are the major contributor to insulin resistance and fatty liver disease (see the Perspective by Kusminski and Scherer). This appears to be caused by the enzyme dihydroceramide desaturase 1 (DES1), which is normally involved in ceramide production by inserting a double bond into the backbone of the molecule. In mice fed a high-fat diet, deletion of DES1 improved glucose and lipid metabolism. </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="6451" page="386" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aav3722">386</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6451" page="319" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax6594">319</jats:related-article> </jats:p>

<jats:title>A double-edged rice paddy herbicide</jats:title> <jats:p> A useful herbicide kills weeds but spares the crop of interest. For many rice paddies, the herbicide benzobicyclon (BBC) serves this purpose. But some rice strains are susceptible to BBC, which diminishes its value in weed control. Maeda <jats:italic>et al.</jats:italic> uncovered the genetic cause controlling the response to the herbicide: resistant rice cultivars have an oxidase that detoxifies BBC herbicides. Susceptible rice varieties carried genetic mutations that disabled the oxidase. The gene <jats:italic>HPPD INHIBITOR SENSITIVE 1</jats:italic> , which encodes the oxidase, may be useful for developing BBC-resistant crops. </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="6451" page="393" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax0379">393</jats:related-article> </jats:p>

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>