Catálogo de publicaciones - revistas

<jats:title>A heavy toll</jats:title> <jats:p> Trade in wildlife, and their parts, is well recognized for a few key species, such as elephants and rhinos, but it occurs globally, across a wide array of species. Scheffers <jats:italic>et al.</jats:italic> looked across tens of thousands of vertebrate species and found that one in every five species is affected by trade of some sort. The impacts of trade tend to be concentrated in certain phylogenetic groups, thus the potential for long-term impact on certain lineages is substantial. This analysis allows for prediction of potential for trade where it does not yet occur, facilitating proactive prevention. </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="6461" page="71" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aav5327">71</jats:related-article> </jats:p>

<jats:title>Conditions right for making nucleosides</jats:title> <jats:p> In the absence of biological catalysts and metabolism, can atmospheric and geochemical processes provide the substrates and conditions required for production of biological molecules? Becker <jats:italic>et al.</jats:italic> devised an abiotic synthetic scheme that allows for accumulation of both purine and pyrimidine nucleoside mono- and diphosphates (see the Perspective by Hud and Fialho). A key starting material for this chemistry, hydroxylamine and/or hydroxylamine disulfonate, can form under plausible early atmospheric conditions. Cycles between wet and dry conditions provide the environments necessary to complete formation of purine and pyrimidine bases essentially in one pot. </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="6461" page="76" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax2747">76</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6461" page="32" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz1130">32</jats:related-article> </jats:p>

<jats:title>An imitation circuit</jats:title> <jats:p> Animals, including humans, rely heavily on imitation and social learning, yet we know little about how this process operates in the brain. Zhao <jats:italic>et al.</jats:italic> used optogenetic manipulation of a synaptic pathway connecting auditory and vocal motor circuits to implant song memories sufficient to guide song learning into young zebra finches (see the Perspective by Clayton). Activation of this circuit overrode learning from live tutors. These experiments define circuits essential for social learning of songs from tutors and show that such memories can be localized. </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="6461" page="83" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaw4226">83</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6461" page="33" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz1552">33</jats:related-article> </jats:p>