Catálogo de publicaciones - revistas

<jats:title>Recycle, recycle, recycle</jats:title> <jats:p> Some polymers, such as polyethylene terephthalate in soft drink bottles, can be depolymerized back to the starting monomers. This makes it possible to repolymerize true virgin material for repeated use. Zhu <jats:italic>et al.</jats:italic> developed a polymer based on a five-membered ring cyclic monomer derived from γ-butyrolactone that could be produced at ambient temperature and mild conditions (see the Perspective by Sardon and Dove). The high-molecular-weight polymer exhibited high crystallinity and thermal stability. However, at hot enough conditions, or at lower temperatures in the presence of a zinc chloride catalyst, the polymer could be returned to its starting monomers and thus recycled into new material. </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="6387" page="398" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aar5498">398</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="380" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aat4997">380</jats:related-article> </jats:p>

<jats:title>A recipe for regeneration</jats:title> <jats:p> Unlike humans, planarian flatworms can regenerate certain tissues. During regeneration, existing tissues remodel, and undifferentiated and progenitor cells convert into specialized cell types at specified locations. Atabay <jats:italic>et al.</jats:italic> examined planarian eye regeneration (see the Perspective by Tanaka). Surgical and transplantation experiments revealed three properties governing regenerative progenitor behavior: cell self-organization, an extrinsic migratory target for progenitors, and a broad progenitor-specification zone. Predictions from this model enabled generation of animals with multiple stable eyes. </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="6387" page="404" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aap8179">404</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="374" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aat4588">374</jats:related-article> </jats:p>

<jats:title>Splitting the entanglement</jats:title> <jats:p> When particles in a quantum mechanical system are entangled, a measurement performed on one part of the system can affect the results of the same type of measurement performed on another part—even if these subsystems are physically separated. Kunkel <jats:italic>et al.</jats:italic> , Fadel <jats:italic>et al.</jats:italic> , and Lange <jats:italic>et al.</jats:italic> achieved this so-called distributed entanglement in a particularly challenging setting: an ensemble of many cold atoms (see the Perspective by Cavalcanti). In all three studies, the entanglement was first created within an atomic cloud, which was then allowed to expand. Local measurements on the different, spatially separated parts of the cloud confirmed that the entanglement survived the expansion. </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="6387" page="413" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao2254">413</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="409" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao1850">409</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="416" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao2035">416</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="376" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aat4590">376</jats:related-article> </jats:p>

<jats:title>Splitting the entanglement</jats:title> <jats:p> When particles in a quantum mechanical system are entangled, a measurement performed on one part of the system can affect the results of the same type of measurement performed on another part—even if these subsystems are physically separated. Kunkel <jats:italic>et al.</jats:italic> , Fadel <jats:italic>et al.</jats:italic> , and Lange <jats:italic>et al.</jats:italic> achieved this so-called distributed entanglement in a particularly challenging setting: an ensemble of many cold atoms (see the Perspective by Cavalcanti). In all three studies, the entanglement was first created within an atomic cloud, which was then allowed to expand. Local measurements on the different, spatially separated parts of the cloud confirmed that the entanglement survived the expansion. </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="6387" page="413" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao2254">413</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="409" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao1850">409</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="416" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aao2035">416</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6387" page="376" related-article-type="in-this-issue" vol="360" xlink:href="10.1126/science.aat4590">376</jats:related-article> </jats:p>