Catálogo de publicaciones - revistas

<jats:title>Making magma chambers from mush</jats:title> <jats:p> Shallow magma chambers either erupt as volcanoes or solidify as intrusive magma bodies. These magma bodies are traditionally considered to be long-lived and dominated by melt. Cashman <jats:italic>et al.</jats:italic> review the evidence that shallow magma chambers are actually assembled quickly from much larger, crystal-rich transcrustal magmatic systems. This paradigm helps explain many geophysical and geochemical features of volcanic systems. It also presents challenges for understanding the evolution of magma and provides insight into how and why volcanoes erupt. </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="6331" page="eaag3055" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aag3055">eaag3055</jats:related-article> </jats:p>

<jats:title>Go with the changing flow</jats:title> <jats:p> The transport of ordinary fluids tends to be driven by pressure differentials, whereas for active or biological matter, transport may be isotropic or governed by the presence of specific chemical gradients. Wu <jats:italic>et al.</jats:italic> analyzed the emergence of spontaneous directional flows in active fluids containing a suspension of microtubules and clusters of the molecular motor kinesin, confined in a variety of microfluidic geometries (see the Perspective by Morozov). When confined in periodic toroidal channels and cylindrical domains, the flow was organized and persisted in a unidirectional motion, either clockwise or counterclockwise. Oddly, this behavior was independent of scale; as long as the aspect ratio of the geometry was chosen appropriately, flows were observed for a wide range of system dimensions. </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="6331" page="eaal1979" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aal1979">eaal1979</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6331" page="1262" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam8998">1262</jats:related-article> </jats:p>

<jats:title>Dendrites are more active than expected</jats:title> <jats:p> Dendrites occupy more than 90% of neuronal tissue. However, it has not been possible to measure distal dendritic membrane potential and spiking in vivo over a long period of time. Moore <jats:italic>et al.</jats:italic> developed a technique to record the subthreshold membrane potential and spikes from neocortical distal dendrites in freely behaving animals. These recordings were very stable, providing data from a single dendrite for up to 4 days. Unexpectedly, distal dendrites generated action potentials whose firing rate was nearly five times greater than at the cell body. </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="6331" page="eaaj1497" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aaj1497">eaaj1497</jats:related-article> </jats:p>

<jats:title>Protein-folded DNA nanostructures</jats:title> <jats:p>A wide variety of DNA nanostructures have been assembled by folding long DNA single strands with short DNA staples. However, such structures typically need annealing at elevated temperatures in order to form. To accommodate the formation of such structures in living cells, Praetorius and Dietz developed an approach in which custom protein staples based on transcription activator–like effector proteins fold double-stranded DNA templates (see the Perspective by Douglas). The structures folded into user-defined geometric shapes on the scale of tens to hundreds of nanometers. These nanostructures could self-assemble at room temperature in physiological buffers.</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="6331" page="eaam5488" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam5488">eaam5488</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6331" page="1261" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aam9541">1261</jats:related-article> </jats:p>