Catálogo de publicaciones - revistas

<jats:p>Emissions from flaring threaten the global climate and the health of local communities</jats:p>

<jats:p>An oncometabolite blocks T cell killing by inhibiting glycolysis</jats:p>

<jats:p>Genetically diverse mice and cross-species comparison uncover links to longevity</jats:p>

<jats:p>Funding agencies have ample room to improve their policies</jats:p>

<jats:p>An insider’s guide to visual reasoning celebrates those who think in pictures and patterns</jats:p>

<jats:p> Highlights from the <jats:italic>Science</jats:italic> family of journals </jats:p>

<jats:p> Rapid melting of ice sheets and glaciers drives a unique geometry, or fingerprint, of sea level change. However, the detection of individual fingerprints has been challenging because of sparse observations at high latitudes and the difficulty of disentangling ocean dynamic variability from the signal. We predict the fingerprint of Greenland Ice Sheet (GrIS) melt using recent ice mass loss estimates from radar altimetry data and model reconstructions of nearby glaciers and compare this prediction to an independent, altimetry-derived sea surface height trend corrected for ocean dynamic variability in the region adjacent to the ice sheet. A statistically significant correlation between the two fields ( <jats:italic>P</jats:italic> &lt; 0.001) provides an unambiguous observational detection of the near-field sea level fingerprint of recent GrIS melting in our warming world. </jats:p>

<jats:p> The conversion of polyolefins to monomers would create a valuable carbon feedstock from the largest fraction of waste plastic. However, breakdown of the main chains in these polymers requires the cleavage of carbon–carbon bonds that tend to resist selective chemical transformations. Here, we report the production of propylene by partial dehydrogenation of polyethylene and tandem isomerizing ethenolysis of the desaturated chain. Dehydrogenation of high-density polyethylene with either an iridium-pincer complex or platinum/zinc supported on silica as catalysts yielded dehydrogenated material containing up to 3.2% internal olefins; the combination of a second-generation Hoveyda-Grubbs metathesis catalyst and [PdP( <jats:sup>t</jats:sup> Bu) <jats:sub>3</jats:sub> (μ-Br)] <jats:sub>2</jats:sub> as an isomerization catalyst selectively degraded this unsaturated polymer to propylene in yields exceeding 80%. These results show promise for the application of mild catalysis to deconstruct otherwise stable polyolefins. </jats:p>