Catálogo de publicaciones - revistas

<jats:title>Integrated quantum nanophotonics</jats:title> <jats:p> Technologies that exploit the rules of quantum mechanics offer a potential advantage over classical devices in terms of sensitivity. Sipahigil <jats:italic>et al.</jats:italic> combined the quantum optical features of silicon-vacancy color centers with diamond-based photonic cavities to form a platform for integrated quantum nanophotonics (see the Perspective by Hanson). They could thus generate single photons from the color centers, optically switch light in the cavity by addressing the state of the color center, and quantum-mechanically entangle two color centers positioned in the cavity. The work presents a viable route to develop an integrated platform for quantum networks. </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="6314" page="847" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aah6875">847</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6314" page="835" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aak9836">835</jats:related-article> </jats:p>

<jats:title>CO takes the lead to make β-lactam rings</jats:title> <jats:p> Strained β-lactam rings are a key feature of penicillin and some other drugs. Willcox <jats:italic>et al.</jats:italic> designed a versatile route to these four-membered ring motifs through the palladiumcatalyzed coupling of carbon monoxide with secondary amines. The bulky carboxylate ligand appears to facilitate preliminary CO incorporation into a Pd anhydride, which is then attacked by the amine to set up ring closure via C–H activation. This approach broadens the substrate scope compared with a previous scheme in which C–H activation preceded CO insertion. </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="6314" page="851" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aaf9621">851</jats:related-article> </jats:p>

<jats:title>Faster light adaptation improves productivity</jats:title> <jats:p> Crop plants protect themselves from excess sunlight by dissipating some light energy as heat, readjusting their systems when shadier conditions prevail. But the photosynthetic systems do not adapt to fluctuating light conditions as rapidly as a cloud passes overhead, resulting in suboptimal photosynthetic efficiency. Kromdijk <jats:italic>et al.</jats:italic> sped up the adaptation process by accelerating interconversion of violaxanthin and zeaxanthin in the xanthophyll cycle and by increasing amounts of a photosystem II subunit. Tobacco plants tested with this system showed about 15% greater plant biomass production in natural field conditions. </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="6314" page="857" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aai8878">857</jats:related-article> </jats:p>

<jats:title>Tandem perovskite cells</jats:title> <jats:p> The ready processability of organic-inorganic perovskite materials for solar cells should enable the fabrication of tandem solar cells, in which the top layer is tuned to absorb shorter wavelengths and the lower layer to absorb the remaining longer-wavelength light. The difficulty in making an all-perovskite cell is finding a material that absorbs the red end of the spectrum. Eperon <jats:italic>et al.</jats:italic> developed an infrared-absorbing mixed tin-lead material that can deliver 14.8% efficiency on its own and 20.3% efficiency in a four-terminal tandem cell. </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="6314" page="861" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aaf9717">861</jats:related-article> </jats:p>

<jats:title>Pluses and minuses of BTX behavior</jats:title> <jats:p> Batrachotoxin is a potent neurotoxin produced by the endangered Colombian poison dart frog and is an agonist of voltage-gated sodium ion channels (NaVs). Logan <jats:italic>et al.</jats:italic> developed a chemical synthesis of this molecule, denoted (−)-BTX, by taking advantage of a tin hydride–mediated radical cyclization to stitch together the polycyclic framework. Using an analogous route, they also prepared the non-natural mirror image, (+)-BTX. Conversely to the natural product, (+)-BTX antagonized NaVs. </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="6314" page="865" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aag2981">865</jats:related-article> </jats:p>

<jats:title>A volcanic end to an earthquake</jats:title> <jats:p> The dangerous and active Aso volcanic cluster appears to have put an early end to the damaging magnitude 7.1 Kumamoto earthquake that struck Japan in April 2016. Lin <jats:italic>et al.</jats:italic> found that the fault rupture stopped underneath the Aso caldera. The unzipping of the fault ended where the rocks went from cold and brittle to a more liquid-like magmatic mush. This distinctive example shows how abrupt changes in rock properties can terminate fault rupture and cap the size of an earthquake. </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="6314" page="869" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aah4629">869</jats:related-article> </jats:p>