Catálogo de publicaciones - revistas

<jats:title>Better living through water-splitting</jats:title> <jats:p> Chemists have known how to use electricity to split water into hydrogen and oxygen for more than 200 years. Nonetheless, because the electrochemical route is inefficient, most of the hydrogen made nowadays comes from natural gas. Seh <jats:italic>et al.</jats:italic> review recent progress in electrocatalyst development to accelerate water-splitting, the reverse reactions that underlie fuel cells, and related oxygen, nitrogen, and carbon dioxide reductions. A unified theoretical framework highlights the need for catalyst design strategies that selectively stabilize distinct reaction intermediates relative to each other. </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" related-article-type="in-this-issue" xlink:href="10.1126/science.aad4998">10.1126/science.aad4998</jats:related-article> </jats:p>

<jats:title>A machine for building ribosomes</jats:title> <jats:p> The ribosome is a very large protein and RNA complex responsible for the difficult process of synthesizing proteins. Construction of the ribosome itself involves several molecular machines and an army of helper proteins and RNAs. Chaker-Margot <jats:italic>et al.</jats:italic> determined the structure of one of those machines, the yeast small subunit processome. The structure reveals how the processome helps in the maturation of individual domains of the ribosome and suggests that the mechanism involves a molecular motor to drive conformational changes. </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" related-article-type="in-this-issue" xlink:href="10.1126/science.aal1880">10.1126/science.aal1880</jats:related-article> </jats:p>

<jats:title>Squeezing out the oddness</jats:title> <jats:p> The material Sr <jats:sub>2</jats:sub> RuO <jats:sub>4</jats:sub> has long been thought to exhibit an exotic, odd-parity kind of superconductivity, not unlike the superfluidity in <jats:sub>3</jats:sub> He. How would perturbing this material's electronic structure affect its superconductivity? Steppke <jats:italic>et al.</jats:italic> put the material under large uniaxial pressure and found that the critical temperature more than doubled and then fell as a function of strain (see the Perspective by Shen). The maximum critical temperature roughly coincided with the point at which the material's Fermi surface underwent a topological change. One intriguing possibility is that squeezing changed the parity of the superconducting gap from odd to even. </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" related-article-type="in-this-issue" xlink:href="10.1126/science.aaf9398">10.1126/science.aaf9398</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6321" page="133" related-article-type="in-this-issue" vol="355" xlink:href="10.1126/science.aak9803">133</jats:related-article> </jats:p>

<jats:p>During the November 2016 Climate Change Conference in Marrakesh, much talk centered on implementation of the political commitments made in Paris in 2015. Governments are now focused on putting their words into action as they prepare for the first official stocktake in 2018. Innovation will have an essential role to play.</jats:p>

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

<jats:p>Mariana Trench's sheer depth and seismic quiet are focuses of international effort.</jats:p>

<jats:p>Researchers pin hopes to future NASA competition.</jats:p>

<jats:p>Lucy and Psyche to explore solar system origins.</jats:p>