Catálogo de publicaciones - revistas

<jats:title>Millennial magma reserves</jats:title> <jats:p> Lava erupts after being stored as magma deeper underground. Silica-rich magmas characteristic of volcanoes like Pinatubo are stored for thousands to hundreds of thousands of years. However, we have little understanding of the time scales for deeper basaltic magma like that supplying Icelandic volcanoes. Mutch <jats:italic>et al.</jats:italic> used diffusion of chromium and aluminum atoms to show that these magmas are stored for hundreds to thousands of years at the crust-mantle boundary. This discovery elucidates the time scale for understanding how magma is created and stored and how it erupts. </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="6450" page="260" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax4092">260</jats:related-article> </jats:p>

<jats:title>Liquid reconfigurable ferromagnetic materials</jats:title> <jats:p> Ferromagnetic materials show a permanent magnetic dipole, whereas superparamagnetic ones only show magnetic properties under an applied field. Some materials, like ferrofluids, show liquid-like behavior but do not retain their magnetization in the absence of an applied field. Liu <jats:italic>et al.</jats:italic> show remnant magnetization of otherwise superparamagnetic magnetite nanoparticles at an oil-water interface of emulsion droplets (see the Perspective by Dreyfus). The permanent magnetization could be controlled by coupling and uncoupling the magnetization of individual nanoparticles, making it possible to “write and erase” shapes of the droplets or to elongate them into cylinders. </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="6450" page="264" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aaw8719">264</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6450" page="219" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax8979">219</jats:related-article> </jats:p>

<jats:title>A quantum breakdown</jats:title> <jats:p> At low temperatures, two-dimensional (2D) systems with contact interactions are expected to exhibit quantum anomalies—a breakdown of scaling laws that characterize such systems in the classical regime. Signatures of these anomalies have been observed in the real-space properties of 2D Fermi gases, but the effect is much less pronounced than expected on theoretical grounds. Murthy <jats:italic>et al.</jats:italic> studied the momentum-space profiles of 2D superfluids of fermionic atoms. They initially perturbed the gas and then monitored the momentum distribution of its atoms. In the regime of strong interactions between the atoms, the momentum profiles deviated markedly from the classical scaling. </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="6450" page="268" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aau4402">268</jats:related-article> </jats:p>

<jats:title>Carbon catenation</jats:title> <jats:p> Preparing interlocked rings and knots at the molecular scale traditionally relies on preorientation of the building blocks by nitrogen or oxygen substituents. Segawa <jats:italic>et al.</jats:italic> devised a distinct strategy to synthesize catenane and trefoil structures composed exclusively of carbon and hydrogen (see the Perspective by Van Raden and Jasti). They linked phenyl rings end to end into macrocycles that met in the middle at a silicon center. Excision of the silicon with fluoride then yielded the interlocked products. </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="6450" page="272" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aav5021">272</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6450" page="216" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aay2861">216</jats:related-article> </jats:p>

<jats:title>Early suckler?</jats:title> <jats:p> One trait that is unique to mammals is milk suckling. Suckling requires the presence of stability and motion in the throat, both of which require a complex hyoid apparatus. Zhou <jats:italic>et al.</jats:italic> describe a mammaliform docodontan fossil from the Jurassic that was preserved with a nearly intact hyoid (see the Perspective by Hoffmann and Krause). The structure is complex and saddle shaped, like that seen in modern mammals, suggesting that a muscularized throat was present before the development of mammals. </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="6450" page="276" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aau9345">276</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6450" page="222" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aay2061">222</jats:related-article> </jats:p>

<jats:title>Growing independently</jats:title> <jats:p> Bacteria produce natural products with a range of functions. A major family comprises ribosomally synthesized and posttranslationally modified peptides. Ting <jats:italic>et al.</jats:italic> identify a biosynthetic pathway in which a natural product is derived from an amino acid that is added to a ribosomally synthesized peptide independent of the ribosome. This biosynthetic paradigm is used in the synthesis of thiaglutamate and ammosamides, and the finding of related gene clusters suggests that the strategy may be used more widely. </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="6450" page="280" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aau6232">280</jats:related-article> </jats:p>

<jats:title>Predicting marine futures</jats:title> <jats:p> The ability to predict how climate variations will affect marine ecosystems would allow better economic and ecosystem planning and management. Park <jats:italic>et al.</jats:italic> found that a global Earth system model skillfully predicted seasonal to multiannual ocean chlorophyll fluctuations in many regions. This could allow annual fish catches in some regions to be forecast 2 to 3 years in advance. </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="6450" page="284" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aav6634">284</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>