Catálogo de publicaciones - revistas

<jats:title>A family of thin materials</jats:title> <jats:p> Two-dimensional (2D) materials have attracted interest because of the unusual properties that emerge in these confined structures. There is a growing family of 2D metal carbides and nitrides known as MXenes that contain an odd number of layers in which metals (M) sandwich carbon or nitrogen (X) layers. VahidMohammadi <jats:italic>et al.</jats:italic> reviewed the progress in synthesizing this growing library of materials. Mixed-metal combinations can be used, as well as a range of surface terminations, making it possible to tune the properties. However, there are still challenges in improving the synthesis methods and developing techniques that can be scaled up. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abf1581, this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.abf1581">eabf1581</jats:related-article> </jats:p>

<jats:title>Visualizing Xist RNA dynamics</jats:title> <jats:p> The noncoding RNA Xist, which controls the process of X chromosome inactivation in mammals, accumulates and spreads over the chromosome from which it is transcribed. The underlying basis for this unusual behavior is poorly understood. Using a new imaging approach called RNA-SPLIT for time-resolved analysis of Xist RNA molecules at super-resolution, Rodermund <jats:italic>et al.</jats:italic> analyzed fundamental parameters of Xist RNA behavior in normal cells and after the perturbation of factors implicated in Xist RNA function. The authors provide new insights into the basis of Xist RNA localization and confinement within the territory of a single X chromosome. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abe7500, this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.abe7500">eabe7500</jats:related-article> </jats:p>

<jats:p>The explosion at the Chernobyl Nuclear Power Plant in Ukraine 35 years ago forged a strong safety culture that underpins nuclear energy today. At a time when the world was divided profoundly by distrust, the accident prompted nations to collaborate and communicate as they became more transparent and open about their nuclear power programs. After the tsunami of 2011 hit the Fukushima Daiichi Nuclear Power Plant in northern Japan, the international community came together again to reinforce the global nuclear safety regime. These anniversaries are reminders of the ever-evolving efforts to strengthen nuclear safety. This is especially important today because public trust is a prerequisite for nuclear power to play its part in mitigating climate change. Too often, the debate about how to move the world onto a more sustainable energy path is framed in the false dichotomy of “either we invest in solar and wind power, or in nuclear energy.” Reaching netzero carbon emissions will require investment in all of them.</jats:p>

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

<jats:p>Pfizer and Moderna have been unwilling to participate in key test of their mRNA vaccines.</jats:p>

<jats:p>Climate models suggest Earth's sister planet was once cool, wet, and habitable.</jats:p>

<jats:p>Findings from combination studies support measures to stretch supplies, avoid side effects.</jats:p>

<jats:p>Relation between genes and risk is uncertain, skeptics say.</jats:p>

<jats:p>Eric Lander to face issues including research security.</jats:p>

<jats:p>FDA breaks from advisers to clear aducanumab based on reduction of toxic brain plaques.</jats:p>