Catálogo de publicaciones - revistas

<jats:title>Designing bacterial superpowers</jats:title> <jats:p> Biological systems read all 64 triplet codons in DNA to encode the synthesis of proteins composed of 20 canonical amino acids. Robertson <jats:italic>et al.</jats:italic> created cells that do not read several codons and showed that this confers complete resistance to viruses, which normally rely on the host cell's ability to read all the codons in the viral genome to reproduce (see the Perspective by Jewel and Chatterjee). The authors reassigned each codon to several noncanonical amino acids (ncAAs). This advance enables the efficient synthesis of proteins containing three distinct ncAAs and the encoded synthesis of entirely noncanonical polymers and macrocycles. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abg3029, this issue p. <jats:related-article issue="6546" page="1057" related-article-type="in-this-issue" vol="372">1057</jats:related-article> ; see also abi9892, p. <jats:related-article issue="6546" page="1040" related-article-type="in-this-issue" vol="372">1040</jats:related-article> </jats:p>

<jats:title>Pushing a pressure standard</jats:title> <jats:p> A challenge for understanding systems at extreme conditions is knowing the exact pressure at which exotic behaviors occur. This situation is caused by the lack of an absolute pressure-density relationship of standard pressure calibrants. Fratanduono <jats:italic>et al.</jats:italic> conducted a series of dynamic compression observations on platinum and gold to establish a high-pressure scale for these metals up to terapascal conditions (see the Perpsective by Jeanloz). This work provides a robust calibration when using these standards in high-pressure devices such as diamond anvil cells. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abh0364, this issue p. <jats:related-article issue="6546" page="1063" related-article-type="in-this-issue" vol="372">1063</jats:related-article> ; see also abi8015, p. <jats:related-article issue="6546" page="1037" related-article-type="in-this-issue" vol="372">1037</jats:related-article> </jats:p>

<jats:title>Keeping brain development untangled</jats:title> <jats:p> Brain circuits established during development can be overlapping or parallel as needed. Pederick <jats:italic>et al.</jats:italic> analyzed how parallel circuits in the mouse medial and lateral hippocampus develop without getting tangled up. Regulated expression of the cell surface molecules teneurin-3 (Ten3) and latrophilin-2 (Lphn2) keeps confusion at bay. Together, these factors act as a membrane-bound ligand-receptor pair with repulsive outcomes, and they are able to destabilize a nascent but incorrect axon-target interaction. Individually, they each mediate homophilic attraction as axons search for their favored targets. </jats:p> <jats:p> Science, abg1774, this issue p. <jats:related-article issue="6546" page="1068" related-article-type="in-this-issue" vol="372">1068</jats:related-article> </jats:p>

<jats:title> Potassium helps CO <jats:sub>2</jats:sub> compete in acid </jats:title> <jats:p> Electrochemical reduction of carbon dioxide (CO <jats:sub>2</jats:sub> ) is a promising means of converting this greenhouse gas into valuable fuels and chemicals. However, two competing reactions restrict the efficiency of this process. In base, much of the CO <jats:sub>2</jats:sub> is trapped as carbonate before reduction; in acid, protons outpace CO <jats:sub>2</jats:sub> at catching electrons from the cathode. Huang <jats:italic>et al.</jats:italic> report that a high dose of potassium ions can help to solve the latter problem. By concentrating potassium ions at the electrode, high selectivity toward CO <jats:sub>2</jats:sub> reduction at high current in acid is possible, which the authors attribute to electrostatic stabilization of the desired adsorbates. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abg6582, this issue p. <jats:related-article issue="6546" page="1074" related-article-type="in-this-issue" vol="372">1074</jats:related-article> </jats:p>