Catálogo de publicaciones - revistas

<jats:p> The dynamics of stem cell replacement at the bottom of the intestinal crypt is visualized and quantified. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="995" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1243148"> Vermeulen <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p>The area of metamaterials may expand to find application in mechanics, acoustics, and thermodynamics.</jats:p>

<jats:p> A simple, robust model explains higher-order organization of mammalian chromosomes. <jats:named-content content-type="related-content"> [Also see Research Article by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="948" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1236083"> Naumova <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p> A new method for visualizing energy transfer between highly excited atoms may provide insight into coherent energy transport in molecular systems. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="954" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1244843"> Günter <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p> A key step in the biosynthesis of the antibiotic fosfomycin requires hydrogen peroxide, rather than molecular oxygen as previously assumed. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="991" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1240373"> Wang <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:p> Two factors that control synapse formation in mammalian brain are associated with human language acquisition. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="987" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1245079"> Sia <jats:italic>et al.</jats:italic> </jats:related-article> ] </jats:named-content> </jats:p>

<jats:title>Chromosome Conundrum</jats:title> <jats:p> The three-dimensional organization of chromosomal DNA within the cell nucleus plays an important role in gene regulation. <jats:bold> Naumova <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="948" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1236083">948</jats:related-article> , published online 7 November; see the Perspective by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="940" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1247514"> <jats:bold> Kleckner <jats:italic>et al.</jats:italic> </jats:bold> </jats:related-article> ) used chromosome conformation capture-based methods in human tissue culture cells to analyze the higher order folding of human chromosomes across the cell cycle. During interphase the chromosomes showed locus-specific compart-mentalization. In mitotic cells, on the other hand, the chromosome organization was more linear, consistent with arrays of consecutive chromatin loops. </jats:p>

<jats:title>Imaging Excitations</jats:title> <jats:p> Complex processes such as chemical reactions and photosynthesis involve the transport of energy. The mechanisms of how the energy migrates, the influence of the surrounding environment, or the extent to which quantum mechanics affects the process remain unclear. <jats:bold> Günter <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="954" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1244843">954</jats:related-article> , published online 7 November; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="942" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1247392">Donley</jats:related-article> </jats:bold> ) found that a cloud of cold atoms suitably prepared and decorated with “impurity” Rydberg atoms could be used to image the transport of excitations between excited Rydberg atoms directly. This ability to tune the influence of the background environment may help in the study of the coherent transport of energy in complex many-body systems. </jats:p>

<jats:title>Fluorinating Pyridine</jats:title> <jats:p> Appending fluorine substituents to carbon centers is commonly used to tune small-molecule properties in pharmaceutical and agrochemical research. However, fluorinations often require the use of corrosive, hazardous reagents. <jats:bold>Fier and Hartwig</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="956" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1243759">956</jats:related-article> ) present an unusually mild and convenient protocol for fluorinating carbon sites adjacent to nitrogen in pyridines and related nitrogen-bearing arenes. The reaction entails treatment with silver difluoride and proceeds rapidly at room temperature. </jats:p>

<jats:title>Venus' Orbit in STEREO</jats:title> <jats:p> Around Earth's orbit there is a circumsolar dust ring composed of particles of cometary and asteroidal origin. Tenuous dust rings are believed to be commonly associated with planets, but—other than around Earth—have not been detected. Now, <jats:bold> Jones <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6161" page="960" related-article-type="in-this-issue" vol="342" xlink:href="10.1126/science.1243194">960</jats:related-article> ) have used observations from the solar terrestrial relations observatory (STEREO) to map a dust ring associated with the orbit of Venus. </jats:p>