Catálogo de publicaciones - revistas

<jats:title>A microseismic turn off</jats:title> <jats:p>Certain strike-slip faults do not have the expected number of microearthquakes between larger earthquakes. Jiang and Lapusta suggest that this behavior is down to what the last big earthquake looked like. They found that microseismicity turns off if an earthquake's rupture runs deeper than the fault's locking depth. This appears to be the case along the famous San Andreas Fault and also along other strike-slip faults around the world. The discovery may allow for better estimates of historic earthquake magnitudes and improve hazard assessments.</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="6291" page="1293" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf1496">1293</jats:related-article> </jats:p>

<jats:title>Hundreds of ions simulate magnetism</jats:title> <jats:p> Strongly interacting quantum systems present a challenge to computational methods even at a relatively low particle number of a few dozen. Researchers are looking to tackle such problems by simulating them in a well-understood and controllable system. A linear array of ions is one such system; however, assembling a large enough number of ions is tricky. Bohnet <jats:italic>et al.</jats:italic> show that a two-dimensional “crystal” of around 200 <jats:sup>9</jats:sup> Be <jats:sup>+</jats:sup> ions held together by magnetic and electric fields in a so-called Penning trap can simulate quantum magnetism. The work sets the stage for simulations with more complicated forms of interaction that classical computers would find intractable. </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="6291" page="1297" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aad9958">1297</jats:related-article> </jats:p>

<jats:title>Converting infrared into visible</jats:title> <jats:p> There is a constant societal drive to develop new light sources that are both efficient and environmentally benign. Rosemann <jats:italic>et al.</jats:italic> developed an amorphous material that emits a broadband (warm white) spectrum of light upon excitation with an infrared laser via highly nonlinear processes. Inorganic nanocrystals form the core of their material and are coated with organic ligands on the surface. When excited with infrared light, nonlinear optical processes cause the material to emit broadband white light. </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="6291" page="1301" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf6138">1301</jats:related-article> </jats:p>

<jats:title>A tip of the HAT to C-C bond formation</jats:title> <jats:p> Iridium and nickel are already a proven team for forging carbon-carbon bonds. The iridium harvests blue light from a simple light-emitting diode and orchestrates the coupling by the nickel. Shaw <jats:italic>et al.</jats:italic> now add a third player to the team, a hydrogen atom transfer (HAT) catalyst (see the Perspective by Fruit). Together, the trio of catalysts can link bromo- or chloroaryl rings directly to C-H sites adjacent to nitrogen or oxygen, with no need for prior modification. The reaction is highly selective across a broad range of substrates. </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="6291" page="1304" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf6635">1304</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6291" page="1277" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf8923">1277</jats:related-article> </jats:p>

<jats:title>Making a critical point about glass</jats:title> <jats:p> Glasses are often thought of as frozen liquids without long-range order. Albert <jats:italic>et al.</jats:italic> used fifth-order dielectric susceptibility measurements to show that the real reason behind the stiffness of glass is more complicated. Measuring the response of two traditional glass formers to very high electric fields is challenging, but reveals the growth of compact domains across the glass transition. The emerging amorphous order is only weakly dependent on the specific molecular properties, suggesting a more universal governing behavior for making glasses. </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="6291" page="1308" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf3182">1308</jats:related-article> </jats:p>

<jats:title>Inject, baby, inject!</jats:title> <jats:p> Atmospheric CO <jats:sub>2</jats:sub> can be sequestered by injecting it into basaltic rocks, providing a potentially valuable way to undo some of the damage done by fossil fuel burning. Matter <jats:italic>et al.</jats:italic> injected CO <jats:sub>2</jats:sub> into wells in Iceland that pass through basaltic lavas and hyaloclastites at depths between 400 and 800 m. Most of the injected CO <jats:sub>2</jats:sub> was mineralized in less than 2 years. Carbonate minerals are stable, so this approach should avoid the risk of carbon leakage. </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="6291" page="1312" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aad8132">1312</jats:related-article> </jats:p>

<jats:title>Perceptual memory needs slow-wave sleep</jats:title> <jats:p> We know little about the mechanisms by which the brain consolidates nondeclarative (perceptual) memories. In a series of behavioral, optogenetic, and electrophysiological experiments, Miyamoto <jats:italic>et al.</jats:italic> show that coordinated neuronal information flow during sleep is required for perceptual memory formation. Activity spreading from the secondary motor area (brain area M2) to the primary sensory region S1 is necessary for this particular kind of memory consolidation. Disturbing this coordinated input during slow-wave sleep immediately after memory acquisition prevented mice from learning a simple texture discrimination task. </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="6291" page="1315" related-article-type="in-this-issue" vol="352" xlink:href="10.1126/science.aaf0902">1315</jats:related-article> </jats:p>