Catálogo de publicaciones - revistas

<jats:title>More diversity at the top</jats:title> <jats:p> A detailed knowledge of cell differentiation hierarchies is important for understanding diverse biological processes such as organ development, tissue regeneration, and cancer. Single-cell RNA sequencing can help elucidate these hierarchies, but it requires reliable computational methods for predicting cell lineage trajectories. Gulati <jats:italic>et al.</jats:italic> developed CytoTRACE, a computational framework based on the simple observation that transcriptional diversity—the number of genes expressed in a cell—decreases during differentiation. CytoTRACE outperformed other methods in several test cases and was successfully applied to study cellular hierarchies in healthy and tumor tissue. </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="6476" page="405" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aax0249">405</jats:related-article> </jats:p>

<jats:title>Shining a light on STM</jats:title> <jats:p>Whereas ultrafast light pulses can provide a window into the dynamics of some of the fastest processes in condensed matter systems, scanning tunneling microscopy (STM) provides snapshots of atomic-scale spatial resolution of surfaces. By irradiating the tunnel junction with carrier-enveloped, phase-stabilized femtosecond light pulses, Garg and Kern effectively combined the two methods to demonstrate a technique capable of both high temporal and high spatial resolution of the elementary processes in matter (see the Perspective by Aiello). By tracking the decay dynamics of plasmonic excitations on the surface of gold nanorods, they illustrate the power of the technique for the tracking and control of ultrafast electronic processes on the atomic scale.</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="6476" page="411" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aaz1098">411</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6476" page="368" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aba0714">368</jats:related-article> </jats:p>

<jats:title>Modeling a superluminous supernova</jats:title> <jats:p> Superluminous supernovae can be up to 100 times brighter than normal supernovae, but there is no consensus on how such bright transients are produced. Jerkstrand <jats:italic>et al.</jats:italic> identified emission lines of iron in the spectrum of a superluminous supernova that appeared more than a year after the explosion. The authors explored models of several possible mechanisms, finding that only one is consistent with all the observations: a normal Type Ia supernova that interacts with a dense shell of circumstellar material. The shell must have been ejected by the progenitor star less than a century before the explosion, perhaps owing to interaction with a binary partner. </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="6476" page="415" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aaw1469">415</jats:related-article> </jats:p>

<jats:title>Heterostructured nanorod libraries</jats:title> <jats:p> The synthesis of nanostructures with well-defined interfaces between different materials can enable applications in areas such as catalysis and solar energy harvesting. Nanomaterials containing several different materials are usually synthesized through top-down approaches, such as surface growth or templating techniques, which usually produce small quantities of particles. Steimle <jats:italic>et al.</jats:italic> performed up to seven cation-exchange reactions (with ions such as Zn <jats:sup>2+</jats:sup> and Co <jats:sup>2+</jats:sup> ) on solution-synthesized copper sulfide nanorods. In principle, more than 65,000 different variations of materials and their interfaces can be made, depending on the order and extent of cation exchange. </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="6476" page="418" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aaz1172">418</jats:related-article> </jats:p>

<jats:title>Detecting a single magnetic excitation</jats:title> <jats:p> Quantum-enhanced sensing is one of the near-term applications for the developing field of quantum technologies. A promising approach to quantum sensing relies on entangling a well-controlled system (the sensor) to the system of interest to detect quanta of excitations in the latter. By entangling a superconducting qubit with a ferrimagnetic crystal, Lachance-Quirion <jats:italic>et al.</jats:italic> demonstrate that they can detect a quantum of magnetic excitation (a magnon) within the sample. The demonstration of a high-efficiency single-magnon detector will be useful for quantum sensing as well as an active component of hybrid quantum systems and should find a wide range of applications in quantum technologies. </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="6476" page="425" related-article-type="in-this-issue" vol="367" xlink:href="10.1126/science.aaz9236">425</jats:related-article> </jats:p>