Catálogo de publicaciones - revistas

<jats:title>Diamond-based sensors</jats:title> <jats:p> Material properties can change dramatically under pressure. Typically, to achieve high-pressure conditions, researchers place their samples in diamond anvil cells (DACs). However, monitoring the properties of the sample inside a DAC is tricky (see the Perspective by Hamlin and Zhou). Hsieh <jats:italic>et al.</jats:italic> , Lesik <jats:italic>et al.</jats:italic> , and Yip <jats:italic>et al.</jats:italic> developed monitoring techniques based on nitrogen-vacancy (NV) centers in diamond. The NV centers can act as sensors because their energy levels and the associated spectra are sensitive to strain and magnetic fields. This enabled optical readout of a spatially resolved signal. </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="6471" page="1349" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaw4352">1349</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1359" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaw4329">1359</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1355" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaw4278">1355</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1312" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz4982">1312</jats:related-article> </jats:p>

<jats:title>Mapping winds in Mars' upper atmosphere</jats:title> <jats:p> The atmospheric loss processes that stripped Mars of most of its ancient atmosphere are poorly understood. Benna <jats:italic>et al.</jats:italic> analyzed atmospheric measurements collected by the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft as it repeatedly dipped into the red planet's upper atmosphere. Combining multiple observing modes allowed the authors to derive wind speeds and map the global circulation of the atmosphere at altitudes of ∼150 kilometers. In some locations, winds followed the slope of the surface topography far below. Such insights into the upper levels of planetary atmospheres are limited, even for Earth. </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="6471" page="1363" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax1553">1363</jats:related-article> </jats:p>

<jats:title>It's the prey that matters</jats:title> <jats:p> Although many people think of dinosaurs as being the largest creatures to have lived on Earth, the true largest known animal is still here today—the blue whale. How whales were able to become so large has long been of interest. Goldbogen <jats:italic>et al.</jats:italic> used field-collected data on feeding and diving events across different types of whales to calculate rates of energy gain (see the Perspective by Williams). They found that increased body size facilitates increased prey capture. Furthermore, body-size increase in the marine environment appears to be limited only by prey availability. </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="6471" page="1367" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax9044">1367</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1316" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aba1128">1316</jats:related-article> </jats:p>

<jats:title>A division of labor for glycosylation</jats:title> <jats:p> Glycosylation is a ubiquitous modification of eukaryotic secreted proteins. Asparagine-linked chains of sugars are appended to many substrates as they are translocated into the endoplasmic reticulum. Ramírez <jats:italic>et al.</jats:italic> solved cryo–electron microscopy structures of two human oligosaccharyltransferase complexes, OST-A and OST-B. The catalytic subunits bind partner proteins that direct glycosylation of specific substrates either cotranslationally (OST-A) or on fully folded proteins (OST-B). High-resolution views of the active site and bound substrates in one of the complexes reveal important features of the human enzymes. </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="6471" page="1372" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz3505">1372</jats:related-article> </jats:p>

<jats:title>Strong and tough fibers</jats:title> <jats:p> Dragline spider silk is known for its combination of strength and toughness, but this combination has been hard to replicate in synthetic fibers. Liao <jats:italic>et al.</jats:italic> electrospun polyacrylonitrile- <jats:italic>co</jats:italic> -methyl acrylate fibers modified with a small amount of poly(ethylene glycol) bisazide (PEG-BA) (see the Perspective by Fox). After collecting the electrospun yarn, it was annealed under tension that both aligned the small fibers and cross-linked them together via the PEG-BA. As hoped, the overall properties were comparable to those of spider silk. </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="6471" page="1376" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay9033">1376</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1314" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz7928">1314</jats:related-article> </jats:p>

<jats:title>Single-layer porphyrin polymerization</jats:title> <jats:p> Two-dimensional polymers can be made as monolayer sheets through controlled synthesis at an interface. However, it is often difficult to create intact sheets over large areas that can be transferred onto substrates. Zhong <jats:italic>et al.</jats:italic> polymerized derivatized porphyrin molecules during laminar flow at a sharp pentane-water interface to form sheets that are 5 centimeters in diameter (see the Perspective by MacLean and Rosei). The authors used electron microscopy and spectroscopy to confirm that they had produced intact monolayers. These films were then transferred onto monolayer sheets of molybdenum disulfide to form superlattices for use as capacitors. </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="6471" page="1379" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax9385">1379</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1308" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz9326">1308</jats:related-article> </jats:p>

<jats:title>Cell-type identification in neural circuits</jats:title> <jats:p> In many cases, a single molecular marker is insufficient to define a specific cell type and may label a few, or a few hundred, physiologically distinguishable cell types. Lee <jats:italic>et al.</jats:italic> developed a high-throughput technique, called physiological optical tagging sequencing (PhOTseq), for identifying the expression profile of cells that exhibit a particular physiological profile (see the Perspective by Renninger). They used PhOTseq to identify genes encoding vomeronasal receptors in mice, which detect pheromones and subserve social communication. </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="6471" page="1384" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax8055">1384</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6471" page="1311" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz8969">1311</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>