Catálogo de publicaciones - revistas

<jats:title>Why batteries go bad</jats:title> <jats:p>Rechargeable batteries are found in a range of everyday devices, from shavers and laptops to cars and airplanes. Over time, these batteries can fail, either through a gradual loss of charge or through the inability to work under tough environmental conditions, leading to more catastrophic failures that cause fires or explosions. Palacin and de Guibert review such failures and suggest that, although often chemistry-specific, common causes can be found. They also look at ways to enhance battery lifetime, such as through improved battery management systems, which are needed for advanced rechargeable batteries.</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" related-article-type="in-this-issue" xlink:href="10.1126/science.1253292">10.1126/science.1253292</jats:related-article> </jats:p>

<jats:title>Quiescent and aging hair follicle stem cells</jats:title> <jats:p> Stem cells enable normal cell homeostasis, but they also exist in a quiescent state, ready to proliferate and differentiate after tissue damage. Now, two studies reveal features of stem cells in the hair follicle, an epithelial mini-organ of the skin that is responsible for hair growth and recycling (see the Perspective by Chuong and Lei). Wang <jats:italic>et al.</jats:italic> found that the Foxc1 transcription factor is induced in activated hair follicle stem cells, which in turn promote Nfatc1 and BMP signaling, to reinforce quiescence. Matsumura <jats:italic>et al.</jats:italic> analyzed hair follicle stem cells during aging. They identified type XVII collagen (COL17A1) as key to hair thinning. DNA damage-induced depletion of COL17A1 triggered cell differentiation resulting in the shedding of epidermal keratinocytes from the skin surface. These changes then caused hair follicle shrinkage and hair loss. </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="6273" page="559" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aaf1635">559</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6273" page="613" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad5440">613</jats:related-article> ; see also 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.aad4395">10.1126/science.aad4395</jats:related-article> </jats:p>

<jats:p> A year ago on this page, I described some of the challenges that science faces in cultivating support from the society it serves. Stepping in as the new Chief Executive Officer of the American Association for the Advancement of Science (AAAS, the publisher of <jats:italic>Science</jats:italic> ), my editorial asked, “Why science? Why AAAS?” My thoughts about the nature and service of science and the mission and goals of AAAS—the world's largest general science membership organization—have since been focusing on new and revitalized efforts that will continue to make AAAS the principal voice for science. A great example of this will be the AAAS Annual Meeting next week in Washington, DC (11 to 16 February), where we will bring together diverse leading voices from around the world to discuss how “Global Science Engagement” can move society toward a secure future. </jats:p>

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

<jats:p>Researchers see many approaches—but a vaccine likely will take years.</jats:p>

<jats:p>Getting highly enriched uranium out of research reactors will stretch to at least 2035, U.S. study concludes.</jats:p>

<jats:p>The Excellence Initiative is on the right track, a panel says.</jats:p>

<jats:p>Television documentary raises new questions about Paolo Macchiarini's trachea implants.</jats:p>

<jats:p>Galaxy cluster gases, active galactic nuclei, and supernova remnants on ASTRO-H agenda.</jats:p>