Catálogo de publicaciones - revistas

<jats:title>Structure of a key spliceosomal complex</jats:title> <jats:p> In eukaryotes, when DNA is transcribed into RNA, the primary transcript has protein-coding sequences interrupted by noncoding sequences called introns. Introns are removed by a complex molecular machine, the spliceosome. Wan <jats:italic>et al.</jats:italic> determined the structure of a key subcomplex, the tri-SNP, that comprises three small nuclear RNAs and more than 30 proteins. The structure, determined by electron microscopy at 3.8 Å resolution, unexpectedly shows a primary RNA transcript bound in the tri-SNP. Further analysis revealed how the spliceosome assembles to achieve its complex functions. </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="6272" page="466" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad6466">466</jats:related-article> </jats:p>

<jats:title>Nanoclusters just by adding CO</jats:title> <jats:p> The most closely packed surfaces of transition metals are usually stable under vacuum, but during catalytic reactions, energetic changes that result from adsorbing molecules could change the surface structure. Eren <jats:italic>et al.</jats:italic> present an extreme example for carbon monoxide (CO) adsorption on the (111) surface of copper at very low partial pressures. The surface decomposed into small nanoclusters (most containing 3 or 19 atoms). The surface was more reactive than the original and, for example, could dissociate adsorbed water at room temperature. </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="6272" page="475" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad8868">475</jats:related-article> </jats:p>

<jats:title>Searching sediment for climate signals</jats:title> <jats:p> Sediments on the ocean floor may provide clues about the interplay between ice ages and mid-ocean ridge magma production. Lund <jats:italic>et al.</jats:italic> present well-dated and detailed sediment records from hydrothermal activity along the East Pacific Rise. The sediments show changes in metal fluxes that are tied to the past two glaciations. Ice age changes in sea level alter magma production, which is manifested by changes in hydrothermal systems. The apparent increase in hydrothermal activity at the East Pacific Rise around the past two glacial terminations suggests some role in moderating the size of ice sheets. </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="6272" page="478" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad4296">478</jats:related-article> </jats:p>

<jats:title>Babylonian astronomers tracked Jupiter</jats:title> <jats:p>Ancient Babylonian astronomers developed many important concepts that are still in use, including the division of the sky into 360 degrees. They could also predict the positions of the planets using arithmetic. Ossendrijver translated several Babylonian cuneiform tablets from 350 to 50 BCE and found that they contain a sophisticated calculation of the position of Jupiter. The method relies on determining the area of a trapezium under a graph. This technique was previously thought to have been invented at least 1400 years later in 14th-century Oxford. This surprising discovery changes our ideas about how Babylonian astronomers worked and may have influenced Western science.</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="6272" page="482" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad8085">482</jats:related-article> </jats:p>

<jats:title>A silent and periodic earthquake trigger</jats:title> <jats:p> Large earthquakes that hit places such as Japan seem to be preceded by subtle and silent deformation. Uchida <jats:italic>et al.</jats:italic> show that these “slow-slip events” are quasi-periodic in the megathrust zone in Japan. Slow-slip events occurred every 1 to 6 years and frequently were correlated with large earthquakes, including the great 2011 Tohoku-oki earthquake. The quasi-periodic behavior stretches back to at least 1930 and provides an important constraint for seismic hazard assessment in the region. </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="6272" page="488" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad3108">488</jats:related-article> </jats:p>