Catálogo de publicaciones - revistas

<jats:p>The crystal structures of human and yeast Argonaute proteins reveal the intricacies of the multidomain enzyme at the hub of the RNA interference machinery.</jats:p>

<jats:p>Two methods improve the quality and ease of structural modeling by showing how to include diffraction data that are often thrown away.</jats:p>

<jats:p>Language and communication are central to shaping concepts such as kinship categories.</jats:p>

<jats:p>Electrical measurements on a semiconductor–superconductor hybrid structure reveal the signature of this long-predicted exotic particle.</jats:p>

<jats:p>Constructing metabolic profiles of 60 cancer cell lines by integrating metabolomics and systems biology revealed increased glycine consumption in highly proliferative cancer cells.</jats:p>

<jats:p>Neurons in the pigeon brain encode information on Earth's magnetic field for orientation and navigation.</jats:p>

<jats:p>Dynamics of Biological Systems, the IBI Prize–winning module, brings mathematics into the biology laboratory.</jats:p>

<jats:p> A monthly roundup of recent news and projects of <jats:italic>Science</jats:italic> 's publisher, the American Association for the Advancement of Science. </jats:p>

<jats:title>Who's Who</jats:title> <jats:p> Different languages rely on distinct sets of terminology to classify relatives, such as maternal grandfather in English, and precision in language usage is a key component for successful communication (see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6084" page="988" related-article-type="in-this-issue" vol="336" xlink:href="10.1126/science.1222691">Levinson</jats:related-article> </jats:bold> ). <jats:bold>Kemp and Regier</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1049" related-article-type="in-this-issue" vol="336" xlink:href="10.1126/science.1218811">1049</jats:related-article> ) propose an organizing framework whereby kinship classification systems can all be seen to optimize or nearly optimize both simplicity and precision. The labels applied to kin are constructed from simple units and are precise enough to reduce confusion and ambiguity when used in communication. <jats:bold>Frank and Goodman</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="998" related-article-type="in-this-issue" vol="336" xlink:href="10.1126/science.1218633">998</jats:related-article> ) show that simplicity and precision also explain how listeners correctly infer the meaning of speech in the context of referential communication. </jats:p>

<jats:title>Pull Me-No!-Push You</jats:title> <jats:p> The <jats:italic>Drosophila</jats:italic> dorsal-ventral (DV) axis is polarized by the movement of the nucleus from the posterior end of the oocyte to its anterior margin. It has long been assumed that the nucleus is pulled to the anterior end by the molecular motor dynein along the polarized microtubule cytoskeleton that defines the anterior-posterior (AP) axis. Using live imaging, <jats:bold> Zhao <jats:italic>et al.</jats:italic> </jats:bold> (p. 999, published online 12 April; see the Perspective by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6084" page="984" related-article-type="in-this-issue" vol="336" xlink:href="10.1126/science.1223141"> <jats:bold>Bowerman and O'Rourke</jats:bold> </jats:related-article> ) now demonstrate that the nucleus is pushed toward the anterior by the force exerted by growing microtubules hitting its posterior side. DV polarity thus depends on the posterior positioning of the microtubule organizing center rather than on AP axis formation. </jats:p>