Catálogo de publicaciones - revistas

<jats:title>Who's a clever boy then?</jats:title> <jats:p> There is considerable value in choosing a smart mate. The suggestion that mate choice has thus shaped the evolution of cognition has been around since Darwin's time, but testing this hypothesis is difficult. Chen <jats:italic>et al.</jats:italic> found that female budgerigars shifted their preference to previously nonpreferred males after these males demonstrated the ability to solve a problem that stumped the originally preferred males (see the Perspective by Striedter). This preference shift was specific to problem-solving and to choosing males. </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="6423" page="166" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aau8181">166</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6423" page="120" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aaw1811">120</jats:related-article> </jats:p>

<jats:title>Memory capabilities develop with age</jats:title> <jats:p>During memory formation, time-compressed neuronal sequences underlie consolidation as well as encoding of novel information. Such memory traces are largely contributed by a selection of preconfigured neuronal patterns. However, when and how these preconfigured patterns first emerge in the hippocampus is unknown. Farooq and Dragoi identified an age-dependent development of network preconfiguration into trajectory-like sequences. This preconfiguration was expressed spontaneously during sleep and emerged from the assembly of persistent, location-depicting ensembles, largely controlled by intrinsic developmental programs. Thus, the compressed binding of adjacent locations into spatial trajectories during navigation and their experience-dependent replay emerge in coordination from spontaneous preconfigured sequences.</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="6423" page="168" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aav0502">168</jats:related-article> </jats:p>

<jats:title>Forest termites mitigate the effects of drought</jats:title> <jats:p> In many tropical regions, where drought is predicted to become more frequent in the coming years, termites are key components of ecosystem function. Ashton <jats:italic>et al.</jats:italic> experimentally manipulated termite communities to quantify their role during the 2015–2016 “super El Niño” drought in a Malaysian tropical rainforest. Termite relative abundance more than doubled in control plots during drought, maintaining three major ecosystem processes: decomposition, nutrient heterogeneity, and moisture retention. Seedling mortality increased where termites were suppressed. </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="6423" page="174" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aau9565">174</jats:related-article> </jats:p>

<jats:title>Ancient changes in the African tropics</jats:title> <jats:p> Long-term records of past vegetation change are key to understanding how climate change affects ecosystems, but data are scarce—especially in highly biodiverse regions in the tropics. Lezine <jats:italic>et al.</jats:italic> present a detailed 90,000-year pollen core from an upland crater-lake site in the west African tropical montane forest, which is important from conservation and biogeographic standpoints. The upper treeline moved in response to climate change during the Pleistocene glacial and interglacial periods, whereas the lower limit of the Afromontane forest was stable. The constituent species of the forest also changed. This record resolves debates concerning the biogeographic history of Afromontane vegetation. </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="6423" page="177" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aav6821">177</jats:related-article> </jats:p>

<jats:title>Switching ON resistance</jats:title> <jats:p> Clonal bacterial colonies will often grow dissimilar patches, similar to a tortoiseshell pattern. These differing phenotypes arise by reversible mechanisms called phase variation. Jiang <jats:italic>et al.</jats:italic> developed an algorithm to survey bacterial genomes for invertible promoters that cause phase variation. Inverted repeats signal the presence of these promoters, which can flip between ON and OFF states catalyzed by phage integrase analogs called invertases. Invertible promoters linked to antibiotic resistance genes were widespread among vertebrate gut–associated organisms, including Bacteroidetes, Spirochaetes, and Verrucomicrobia. These bacteria are thus equipped and prepared for sudden environmental stress, including antibiotic exposure. </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="6423" page="181" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aau5238">181</jats:related-article> </jats:p>

<jats:title>Astrocytes can drive the master clock in the brain</jats:title> <jats:p> The neurons of the suprachiasmatic nucleus (SCN) of the hypothalamus function as a central circadian clock, coordinating mammalian physiology with the 24-hour light-dark cycle. Brancaccio <jats:italic>et al.</jats:italic> found that these neurons have help from neighboring astrocytes (see the Perspective by Green). In mice lacking the <jats:italic>Cry</jats:italic> gene, which encodes a critical clock component, restoration of <jats:italic>Cry</jats:italic> expression and molecular clock function in the astrocytes, but not the neighboring neurons, restored rhythmic transcriptional oscillations in the SCN and reestablished circadian behaviors in the mice. </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="6423" page="187" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aat4104">187</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6423" page="124" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aav9706">124</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>