Catálogo de publicaciones - revistas

<jats:p>Two studies reveal the reciprocal regulation of two different calcium channels.</jats:p>

<jats:p>A fermentation process that balances the activities of several bacterial and plant enzymes makes a precursor to an anticancer drug in substantial quantities.</jats:p>

<jats:p>A high rate of recombination restores the function of a mutated gene that encodes keratin, giving rise to the “confetti” spots in a rare skin disorder.</jats:p>

<jats:p>The Kepler space telescope has found a system of planets whose orbital timing varies due to gravitational coupling.</jats:p>

<jats:p>The clear and wide-ranging vision of a great biologist enlightened our understanding of natural selection and adaptation.</jats:p>

<jats:p>Viruslike particles enable lateral gene transfer among marine microorganisms.</jats:p>

<jats:title>Extra Exoplanet?</jats:title> <jats:p> A planet is said to transit its star if it can be seen to pass in front of the star; 19% of the known extrasolar planets are transiting planets. A lone planet will transit in an exactly periodic manner; if other planets are present, however, variations in transit duration are expected because of gravitational interactions. <jats:bold> Holman <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="51" related-article-type="in-this-issue" vol="330" xlink:href="10.1126/science.1195778">51</jats:related-article> , published online 26 August; see the cover; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6000" page="47" related-article-type="in-this-issue" vol="330" xlink:href="10.1126/science.1196505">Laughlin</jats:related-article> </jats:bold> ) report timing variations in the transits of two exoplanets detected by the Kepler space telescope. The planets have masses similar to that of Saturn and transit the same Sun-like star. A third planet several times the mass of Earth may also transit the star in an interior orbit. </jats:p>

<jats:title>Mechanical Responders Identified</jats:title> <jats:p> Although many cells appear to respond to mechanical stimulation through increased conductance of ion channels in the plasma membrane, the actual channels that mediate these effects—which are important in diverse processes from hearing and touch to control of blood pressure—have remained elusive. <jats:bold> Coste <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="55" related-article-type="in-this-issue" vol="330" xlink:href="10.1126/science.1193270">55</jats:related-article> , published online 2 September) used RNA interference to decrease expression of candidate genes systematically in a mouse neuroblastoma cell line and identified two genes that encode proteins, Piezo1 and Piezo2, which are required for mechanically stimulated cation conductance in these cells and in cultured dorsal root ganglion neurons. Similar proteins are expressed in a range of species from protozoa to vertebrates. The proteins are not similar to known pore-forming proteins and thus could be unusual channels or regulatory components of a channel complex. </jats:p>

<jats:title>Avoiding Loss in a Quantum System</jats:title> <jats:p> Single electron spins in solid-state environments have been explored as candidates for quantum information storage and computation; however, they often interact strongly with their surroundings and lose the stored information on the time scale of pico- to milliseconds. Dynamical decoupling schemes have been introduced to “undo” the effects of this interaction by applying a sequence of control pulses that reverse the undesirable evolution of the system. <jats:bold> De Lange <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="60" related-article-type="in-this-issue" vol="330" xlink:href="10.1126/science.1192739">60</jats:related-article> , published online 9 September) tested several decoupling schemes on a nitrogen vacancy center in diamond and found that a scheme with evenly spaced pulses with double-axis decoupling could prolong the coherence time of an arbitrary spin state up to 25-fold. </jats:p>

<jats:title>Two for One</jats:title> <jats:p> Solar cells often contain materials that absorb a broad spectrum of light above a certain frequency threshold, or band gap. Unfortunately, much of the energy contained in this light is wasted, because any balance exceeding the band gap tends to be dissipated as heat, rather than harnessed into electric current. Recent spectroscopic studies have shown that incident photons with energy several multiples of the band gap can transiently generate more than one current carrier, but the excess carriers tend to collapse before they can be diverted into the circuit. <jats:bold> Sambur <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="63" related-article-type="in-this-issue" vol="330" xlink:href="10.1126/science.1191462">63</jats:related-article> ) now show that, when light-absorbing lead sulfide nanoparticles are carefully coupled to smoothly polished titanium dioxide crystalline electrodes, such excess carriers can be transferred into the circuit before collapsing. </jats:p>