Catálogo de publicaciones - revistas

<jats:p> Levis <jats:italic>et al</jats:italic> . (Research Articles, 3 March 2017, p. 925) concluded that pre-Columbian tree domestication has shaped present-day Amazonian forest composition. The study, however, downplays five centuries of human influence following European arrival to the Americas. We show that the effects of post-Columbian activities in Amazonia are likely to have played a larger role than pre-Columbian ones in shaping the observed floristic patterns. </jats:p>

<jats:title>Programmed recognition of microbiota</jats:title> <jats:p> Increasingly, we recognize that the gut is a specialized organ for maintaining microbial symbioses alongside nutritional functions. The gut produces large quantities of immunoglobulin A (IgA), which adheres to the surface of gut microbes. Bunker <jats:italic>et al.</jats:italic> discovered that antibodies produced by naïve small intestinal plasma cells are recirculated and enriched within Peyer's patches, independently of exogenous antigen and T cell help. The resulting polyreactive IgAs are released into the gut lumen and bind to microbial surface glycans, thus innately recognizing the gut microbiota. Polyreactive IgAs appear to be a product of the coevolution of host and microbiota to maintain symbiotic homeostasis. </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="6361" page="eaan6619" related-article-type="in-this-issue" vol="358" xlink:href="10.1126/science.aan6619">eaan6619</jats:related-article> </jats:p>

<jats:title>Slow light on the nanoscale</jats:title><jats:p>When light passes through an optical material, its speed is reduced by the refractive index of that material. Under exceptional circumstances, light can be slowed to a walking pace or even stopped momentarily. Exploring approaches for practical applications, Tsakmakidis<jats:italic>et al.</jats:italic>review how the speed of light can be controlled using designed materials and fabricated structures. They show how the combination of slow light and nanotechnology gives rise to a number of effects of interest in signal processing and optoelectronic communication.</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="6361" page="eaan5196" related-article-type="in-this-issue" vol="358" xlink:href="10.1126/science.aan5196">eaan5196</jats:related-article></jats:p>

<jats:p> McMichael <jats:italic>et al</jats:italic> . state that we overlooked the effects of post-Columbian human activities in shaping current floristic patterns in Amazonian forests. We formally show that post-Columbian human influences on Amazonian forests are indeed important, but they have played a smaller role when compared to the persistent effects of pre-Columbian human activities on current forest composition. </jats:p>

<jats:p>The United Kingdom's vote in favor of leaving the European Union (EU) has considerable ramifications for science. As the UK negotiates its “Brexit,” there is recognition that research is crucial to long-term economic success and that Europe needs a strong knowledge and innovation system to compete internationally and tackle challenges such as climate change and improved health care. It would be unacceptable to allow Brexit to jeopardize this.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>Unprecedented view of a neutron-star collision is a scientific gold mine.</jats:p>