Catálogo de publicaciones - revistas

<jats:title>River systems reveal planetary tectonics</jats:title> <jats:p> Earth, Mars, and Titan have all hosted rivers at some point in their histories. Rivers erode the landscape, leaving behind signatures that depend on whether the surface topography was in place before, during, or after the period of liquid flow. Black <jats:italic>et al.</jats:italic> developed two metrics to measure how well river channels align with the surrounding large-scale topography (see the Perspective by Burr). Earth's plate tectonics introduce features such as mountain ranges that cause rivers to divert, processes that clearly differ from those found on Mars and Titan. </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="6339" page="727" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aag0171">727</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6339" page="708" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aan2719">708</jats:related-article> </jats:p>

<jats:title>Drying natural gas efficiently</jats:title> <jats:p> Natural gas must be purified before it can be transported. The preparation process also includes a drying step to remove water. Microporous adsorbents such as zeolites are used for this purpose, but they often need to be heated to temperatures up to 250°C to remove the water so that they can be reused. Cadiau <jats:italic>et al.</jats:italic> describe a fluorinated metal-organic framework containing nickel metal centers that can remove water from gas streams but that can be regenerated by heating to only 105°C. </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="6339" page="731" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aam8310">731</jats:related-article> </jats:p>

<jats:title>Graphene takes light to a higher level</jats:title> <jats:p> High harmonic generation is a useful nonlinear effect in which the light-matter interaction within a material results in the conversion of one wavelength to a shorter one. Typically performed in atomic gases, there is now interest in extending such a process to the solid state. Yoshikawa <jats:italic>et al.</jats:italic> pumped single-layer graphene with intense polarized pulses of infrared light to generate ultraviolet light, up to the ninth harmonic. Theoretical analysis of the process suggests that the effect could be transferred to other solid-state systems, providing a possible route to develop coherent light sources across the spectrum. </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="6339" page="736" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aam8861">736</jats:related-article> </jats:p>

<jats:title>Watching defects in heated thin films</jats:title> <jats:p> The response of materials to external conditions depends on small-scale features such as defects and grain boundaries. Yau <jats:italic>et al.</jats:italic> heated gold thin films and used coherent x-ray diffractive imaging to track how these microstructures developed during grain growth (see the Perspective by Suter). The technique allowed nondestructive visualization of the features in three dimensions. The method should help link external stimuli to material response through changes in microstructure, thereby allowing development of novel materials through microstructural engineering. </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="6339" page="739" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aam6168">739</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6339" page="704" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aan2544">704</jats:related-article> </jats:p>

<jats:title>Risky in the tropics</jats:title> <jats:p> It is well known that diversity increases toward the tropics. Whether this increase translates into differences in interaction rates among species, however, remains unclear. To simplify the problem, Roslin <jats:italic>et al.</jats:italic> tested for predation rates by using a single approach involving model caterpillars across six continents. Predator attack rates were higher toward the equator, but only for arthropod predators. </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="6339" page="742" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aaj1631">742</jats:related-article> </jats:p>

<jats:title>A brain region for social cognition</jats:title><jats:p>Monkeys recognize social interactions and their meanings quickly and effortlessly. Little is known about the neural circuitry that underlies this understanding. Sliwa and Freiwald scanned monkey brains as the monkeys watched static or moving stimuli. A subset of brain areas was exclusively active during monkey-monkey interactions, as opposed to physical interactions between two objects. This network shares some of its components with the monkey mirror neuron system mapped previously by others and with a possible homolog of the human network involved in the theory of mind.</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="6339" page="745" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aam6383">745</jats:related-article></jats:p>

<jats:title>From air to shining sea</jats:title> <jats:p> Nitrogen is an essential nutrient for phytoplankton growth. Nitrogen is primarily supplied to the surface ocean by mixing from below. However, as fertilizer use and combustion of fossil fuels rise, the atmosphere is expected to become an increasingly important source. Ren <jats:italic>et al.</jats:italic> measured nitrogen isotopes in organic matter from a South China Sea coral (see the Perspective by Boyle). Their findings suggest that atmospheric deposition of anthropogenic nitrogen began right at the end of the 20th century. This pathway now supplies nearly one quarter of the annual nitrogen input to the surface ocean in this region. </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="6339" page="749" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aal3869">749</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6339" page="700" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aan3242">700</jats:related-article> </jats:p>

<jats:title>ATP boosts protein solubility</jats:title> <jats:p> Adenosine triphosphate (ATP) has well-characterized roles in providing energy for biochemical reactions within cells. Patel <jats:italic>et al.</jats:italic> find that ATP may also enhance protein solubility, which could help explain why such high concentrations of ATP are maintained in cells (see the Perspective by Rice and Rosen). Protein concentrations in cells can exceed 100 mg/ml. The authors found that ATP at concentrations found in cells could act as a hydrotrope to help solubilize hydrophobic proteins. The results raise the possibility that ATP concentrations could influence processes such as protein aggregation that occur in disease or liquid-liquid phase separations that occur within cells. </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="6339" page="753" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aaf6846">753</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6339" page="701" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aan4223">701</jats:related-article> </jats:p>

<jats:title>Embryo viability relies on placental repression</jats:title> <jats:p> The insulin-like growth factor (IGF) signaling pathway controls maternal supply of and fetal demands for nutrients. Yang <jats:italic>et al.</jats:italic> report that the essential KRAB–zinc finger protein ZFP568 specifically and directly represses a placental-specific IGF2 transcript during early mouse development. Elimination of ZFP568 in vivo leads to the inappropriate early activation of transcription, which results in embryonic death owing to overexpression of IGF2 peptide. Thus, the specific, targeted preimplantation repression of a promoter is essential for viability. </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="6339" page="757" related-article-type="in-this-issue" vol="356" xlink:href="10.1126/science.aah6895">757</jats:related-article> </jats:p>

<jats:p> With DNA sequencing becoming ever cheaper, genomics has become a popular tool to investigate individual microorganisms or microbiome communities. A variety of sequencing technologies are now available to assist researchers with everything from sample collection to analysis. <jats:list list-type="bullet"> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/custom-publishing/technology-features/mining-microbes-creating-genomic-tools-fight-disease">Read the Feature (Full-Text HTML)</jats:ext-link> </jats:p> </jats:list-item> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/sites/default/files/custom-publishing/documents/19MayMicrobiomics.pdf">Read the Feature (PDF)</jats:ext-link> </jats:p> </jats:list-item> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/sites/default/files/custom-publishing/douments/19MayNewProducts.pdf">Read New Products (PDF)</jats:ext-link> </jats:p> </jats:list-item> </jats:list> </jats:p>