Catálogo de publicaciones - revistas

<jats:title>Cold is better for polar predators</jats:title> <jats:p> Generally, biodiversity is higher in the tropics than at the poles. This pattern is present across taxa as diverse as plants and insects. Marine mammals and birds buck this trend, however, with more species and more individuals occurring at the poles than at the equator. Grady <jats:italic>et al.</jats:italic> asked why this is (see the Perspective by Pyenson). They analyzed a comprehensive dataset of nearly 1000 species of shark, fish, reptiles, mammals, and birds. They found that predation on ectothermic (“cold-blooded”) prey is easier where waters are colder, which generates a larger resource base for large endothermic (“warm-blooded”) predators in polar regions. </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.aat4220">eaat4220</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6425" page="338" related-article-type="in-this-issue" vol="363" xlink:href="10.1126/science.aav9156">338</jats:related-article> </jats:p>

<jats:title>A myeloid cell atlas of neuroinflammation</jats:title> <jats:p> Myeloid cells, such as dendritic cells and macrophages, in the central nervous system (CNS) play critical roles in the initiation and exacerbation of multiple sclerosis (MS). Jordão <jats:italic>et al.</jats:italic> combined high-throughput single-cell RNA sequencing and intravital microscopy to compile a transcriptional atlas of myeloid subsets in experimental autoimmune encephalomyelitis (EAE), a mouse model of MS. Microglia and other CNS-associated macrophages expanded and transformed into various context-dependent subtypes during EAE. Furthermore, dendritic cells and monocyte-derived cells, but not resident macrophages, played a critical role by presenting antigen to pathogenic T cells. This exhaustive characterization may inform future therapeutic targeting strategies in MS. </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.aat7554">eaat7554</jats:related-article> </jats:p>

<jats:p>This month, President Jair Bolsonaro took office in Brazil. He must now lead a country that is undergoing its worst recession and political divisions in a generation—a daunting time to take up the reins. Unfortunately, his immediate solutions are a threat to the Amazon forest—a resource that most Brazilians want to protect. For this sentiment to continue to flourish, science and its role in policy-making must be strengthened, not reduced. Brazil must keep environmental conservation and sustainability as priorities if it wants solutions that benefit all of its people, as well as the greater Earth ecosystem, for future generations.</jats:p>

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

<jats:p>Scientists worry about the cost and feasibility of "boost-phase" antimissile technologies.</jats:p>

<jats:p>He Jiankui loses university job after preliminary findings that he "dodged supervision" and violated regulations.</jats:p>

<jats:p>Colorado to launch study of potential air quality effects of indoor cannabis facilities.</jats:p>