Catálogo de publicaciones - revistas

<jats:title>Ecosystem protection payments pay off</jats:title> <jats:p> Trees take up a lot of CO <jats:sub>2</jats:sub> , so one approach to reducing the rate of increase in atmospheric CO <jats:sub>2</jats:sub> levels is to reduce the cutting down of trees. Jayachandran <jats:italic>et al.</jats:italic> evaluated a program in which forest owners in Uganda were paid to not cut down their trees. Encouragingly, payments did reduce deforestation, and owners did not compensate by cutting down trees in neighboring forests. Furthermore, even in a scenario where cutting resumed after payments ceased, the beneficial delay in CO <jats:sub>2</jats:sub> release from cut trees, as quantified by the social cost of carbon, outweighed the monetary cost. </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="6348" page="267" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aan0568">267</jats:related-article> </jats:p>

<jats:title>Untangling aggregates one step at a time</jats:title> <jats:p> Conserved AAA+ protein complexes exploit adenosine triphosphate hydrolysis to unfold and disaggregate their substrates in response to cell stress, but exactly how they do this has been unclear. Gates <jats:italic>et al.</jats:italic> determined high-resolution cryo-electron microscopy structures of the Hsp104 disaggregase bound to an unfolded polypeptide substrate in its channel. The structures reveal substrate interactions and two different translocation states. Hsp104 undergoes conformational changes that drive movement along the substrate by two-amino-acid steps. These states help explain how this molecular machine can solubilize protein aggregates and amyloids. </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="6348" page="273" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aan1052">273</jats:related-article> </jats:p>

<jats:title>A stretchy binder protects the silicon</jats:title> <jats:p> A challenge in using silicon particles for lithium batteries is that the large volume changes during charge-discharge cycling cause the particles to fracture, which builds up an insulating interface layer. Choi <jats:italic>et al.</jats:italic> show that traditional binder materials used to cushion the silicon particles can be improved by adding small amounts of polyrotaxanes (see the Perspective by Ryu and Park). The molecules consist of multiple rings that are strung along a linear segment and stoppered at each end. Some of the rings are anchored to the polymer binder, whereas others float freely, yielding a highly mobile but connected network that anchors the binder, and thus the silicon particles, together. </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="6348" page="279" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aal4373">279</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6348" page="250" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aan6685">250</jats:related-article> </jats:p>

<jats:title>Lighting the way to carbon borylation</jats:title> <jats:p> Boron substituents provide versatile reactivity, and their utility has been emerging in pharmaceutical contexts. Fawcett <jats:italic>et al.</jats:italic> show that visible light can induce replacement of carboxylic acid groups with boronate esters, which will ease their introduction into a wide variety of compounds. Once the acids are activated with phthalimide substituents, they can react with catecholborane dimers under illumination in amide solvents, with no need for catalysts or other additives. The reaction appears to proceed by radical chain propagation after photoinitiation. </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="6348" page="283" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aan3679">283</jats:related-article> </jats:p>