Catálogo de publicaciones - revistas

<jats:title>From blastula to neural crest, do not pass go</jats:title> <jats:p> During vertebrate development, neural crest cells give rise to an unusual diversity of cells, including pigment cells, neurons, and cartilage. Traditionally, neural crest cells have been considered a derivative of neural ectoderm. Buitrago-Delgado <jats:italic>et al.</jats:italic> now show that neural crest cells have components of the molecular programs characteristic of blastula cells from earlier in development (see the Perspective by Hoppler and Wheeler). Blastula cells have the broad range of developmental potentials necessary to build the embryo. Neural crest cells may thus reflect persistence of the developmental programs characteristic of early development rather than re-specification of developmental programs after differentiation into neurectoderm. </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="6241" page="1332" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aaa3655">1332</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6241" page="1316" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aab2719">1316</jats:related-article> </jats:p>

<jats:title>Making quakes depends on injection rates</jats:title> <jats:p> Wastewater injection wells induce earthquakes that garner much attention, especially in tectonically inactive regions. Weingarten <jats:italic>et al.</jats:italic> combined information from public injection-well databases from the eastern and central United States with the best earthquake catalog available over the past 30 years. The rate of fluid injection into a well appeared to be the most likely decisive triggering factor in regions prone to induced earthquakes. Along these lines, Walsh III and Zoback found a clear correlation between areas in Oklahoma where waste saltwater is being injected on a large scale and areas experiencing increased earthquake activity. </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="6241" page="1336" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aab1345">1336</jats:related-article> ; <jats:italic>Sci. Adv.</jats:italic> 10.1126/sciadv.1500195 (2015). </jats:p>

<jats:title>Photoinduction of long-lived polarons</jats:title> <jats:p> Photosynthetic complexes and organic photovoltaics can rapidly create separated charges upon photoexcitation. However, unproductive charge recombination often occurs in the human-made system. This is in part because the charge acceptor and donor structures are much larger. Huber <jats:italic>et al.</jats:italic> created aqueous micelles that pair conjugated polyelectrolyte charge donors with fullerene acceptors at a much smaller interface. They observed the photoinduced formation of polarons—stable pairs of separated charges—with lifetimes of several days. </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="6241" page="1340" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aaa6850">1340</jats:related-article> </jats:p>

<jats:title>Watching defects during battery cycling</jats:title> <jats:p> Dislocations affect the mechanical properties of a material. Ulvestad <jats:italic>et al.</jats:italic> studied the influence of dislocations on a nanoparticle undergoing charge and discharge cycles in a lithium ion battery. The defects influenced the way the material expanded and contracted during cycling. In the future, it may be possible to tune the properties of a material through controlled defect engineering. </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="6241" page="1344" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aaa1313">1344</jats:related-article> </jats:p>

<jats:title>Composite membranes for filtering solvents</jats:title> <jats:p> Much research has focused on finding membranes that can purify water or extract waste carbon dioxide. However, there is also a need for the removal of small molecules from organic liquids. Many existing processes are energy-intensive and can require large quantities of solvents. Karan <jats:italic>et al.</jats:italic> grew confined polymer layers on a patterned sacrificial support to give rippled thin films that were then placed on ceramic membranes (see the Perspective by Freger). The composite membrane showed high flux for organic solvents and good stability and was able to separate out small molecules with high efficiency. </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="6241" page="1347" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aaa5058">1347</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6241" page="1317" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aab3727">1317</jats:related-article> </jats:p>

<jats:title>Signal flow during sensorimotor choices</jats:title> <jats:p> Little is known about the flow of task signals across the brain. Siegel <jats:italic>et al.</jats:italic> simultaneously recorded from multiple units in the sensory, parietal, prefrontal, and motor cortex while monkeys were cued to perform one among two possible simple tasks. The proportion of neurons coding for stimuli, cues, tasks, and choices, and their response latency, varied across regions. Parietal and prefrontal brain regions encoded task information and choices with the same latency. Interestingly, all brain areas encoded all types of information. However, they differed functionally according to the proportions of neurons and their response latency. </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="6241" page="1352" related-article-type="in-this-issue" vol="348" xlink:href="10.1126/science.aab0551">1352</jats:related-article> </jats:p>