Catálogo de publicaciones - revistas

<jats:title>A rationally designed DNA-based oscillator</jats:title> <jats:p> An important goal of synthetic biology is to create biochemical control systems with the desired characteristics from scratch. Srinivas <jats:italic>et al.</jats:italic> describe the creation of a biochemical oscillator that requires no enzymes or evolved components, but rather is implemented through DNA molecules designed to function in strand displacement cascades. Furthermore, they created a compiler that could translate a formal chemical reaction network into the necessary DNA sequences that could function together to provide a specified dynamic behavior. </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="6369" page="eaal2052" related-article-type="in-this-issue" vol="358" xlink:href="10.1126/science.aal2052">eaal2052</jats:related-article> </jats:p>

<jats:title>Wired for success</jats:title> <jats:p> Although overall battery performance is limited by the electrochemistry of the component materials, the actual performance can be limited by a number of factors. Zhu <jats:italic>et al.</jats:italic> review different electrode architectures for lithium-ion batteries. In particular, they look at the relations between the kinetics and dimensionality of the different electrode constituents. Making things smaller can improve transport of electrons and ions, but at the cost of making the overall architecture more complex. The authors discuss the overall design rules and criteria to guide battery design. </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="6369" page="eaao2808" related-article-type="in-this-issue" vol="358" xlink:href="10.1126/science.aao2808">eaao2808</jats:related-article> </jats:p>

<jats:title>Large origami from a single strand</jats:title> <jats:p> Nanostructures created by origami-like folding of nucleic acids are usually formed by base-pairing interactions between multiple strands. Han <jats:italic>et al.</jats:italic> show that large origami (up to 10,000 nucleotides for DNA and 6000 nucleotides for RNA) can be created in simple shapes, such as a rhombus or a heart. A single strand can be folded smoothly into structurally complex but knot-free structures by using partially complemented double-stranded DNA and the cohesion of parallel crossovers. The use of single strands also enables in vitro synthesis of these structures. </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="6369" page="eaao2648" related-article-type="in-this-issue" vol="358" xlink:href="10.1126/science.aao2648">eaao2648</jats:related-article> </jats:p>

<jats:p>The United States Congress has been taking steps toward passage of a law that would dramatically modify income tax policy. At the time of this writing, different bills have been passed by the House of Representatives and the Senate, and the process of reconciling these into a single bill is under way. These have several provisions that directly affect higher education, including science training. Disturbingly, these provisions emerged from a remarkably opaque process with little or no discussion of their policy objectives or analysis of data that would inform these important decisions.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>U.S.-Afghan partnership spots ancient sites by the thousands, a first step to protection.</jats:p>

<jats:p>Emmanuel Macron's government hires 18 to help “Make Our Planet Great Again.”</jats:p>

<jats:p>Antarctic expedition will probe ecosystem exposed by calving of massive iceberg.</jats:p>