Catálogo de publicaciones - revistas

<jats:title>A complex landscape for reef management</jats:title> <jats:p> Coral reefs are among the most biodiverse systems in the ocean, and they provide both food and ecological services. They are also highly threatened by climate change and human pressure. Cinner <jats:italic>et al.</jats:italic> looked at how best to maximize three key components of reef use and health: fish biomass, parrotfish grazing, and fish trait diversity. They found that when human pressure is low, all three traits can be maximized at high conservation levels. However, as human use and pressure increase, it becomes increasingly difficult to promote biodiversity conservation. At some levels of human impact, even the highest amount of protection is not able to maximize biodiversity conservation. </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="6488" page="307" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.aax9412">307</jats:related-article> </jats:p>

<jats:title>A topological light funnel</jats:title> <jats:p> Because most physical systems cannot be totally isolated from their environment, some degree of dissipation or loss is expected. The successful operation of such systems generally relies on mitigating for that loss. Mathematically, such external interactions are described as non-Hermitian. Recent work has shown that controlling the gain and loss in these systems gives rise to a wide variety of exotic phenomena not expected for their isolated Hermitian counterparts. Using a time-dependent photonic lattice in which the topological properties can be controlled, Weidemann <jats:italic>et al.</jats:italic> show that such a structure can efficiently funnel light to the interface irrespective of the point of incidence on the lattice. Such control of the topological properties could be useful for nanophotonic applications in integrated optical chip platforms. </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="6488" page="311" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.aaz8727">311</jats:related-article> </jats:p>

<jats:title>A trend of warming and drying</jats:title> <jats:p> Global warming has pushed what would have been a moderate drought in southwestern North America into megadrought territory. Williams <jats:italic>et al.</jats:italic> used a combination of hydrological modeling and tree-ring reconstructions of summer soil moisture to show that the period from 2000 to 2018 was the driest 19-year span since the late 1500s and the second driest since 800 CE (see the Perspective by Stahle). This appears to be just the beginning of a more extreme trend toward megadrought as global warming continues. </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="6488" page="314" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.aaz9600">314</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6488" page="238" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.abb6902">238</jats:related-article> </jats:p>

<jats:title>Lighting the way coming and going</jats:title> <jats:p> Catalysts accelerate chemical reactions by breaking existing bonds and then forming new ones. Often, the factors that favor the first process can muddle the second one, constraining a catalyst's generality. Torres <jats:italic>et al.</jats:italic> found that visible light excitation of a palladium complex can facilitate both the breaking and making of carbon-halogen bonds (see the Perspective by Kathe and Fleischer). The reaction specifically forms acid chlorides by carbonylation of a wide variety of alkyl or aryl bromides and iodides. These products in turn can react further to form amides and esters. </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="6488" page="318" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.aba5901">318</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6488" page="242" related-article-type="in-this-issue" vol="368" xlink:href="10.1126/science.abb2104">242</jats:related-article> </jats:p>

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>