Catálogo de publicaciones - revistas

<jats:title>Special moments at cortical quiet states</jats:title> <jats:p>Delta waves are moments of widespread cortical silence that alternate with active states during slow-wave sleep. However, upon closer examination, single neuronal action potentials can be detected during delta waves. Todorova and Zugaro sought to determine whether this neuronal noise could instead be an important signal (see the Perspective by Ikegaya and Matsumoto). They found that persisting action potential firing during delta waves is an overlooked but widespread phenomenon, which could potentially involve all neurons and all delta waves. A critical role of the delta wave may be to insulate specific cortical computations taking place in response to hippocampal replay and involved in memory consolidation.</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="6463" page="377" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay0616">377</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6463" page="306" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz4534">306</jats:related-article> </jats:p>

<jats:title>Down and down the energy cascade</jats:title> <jats:p> Injecting energy into a turbulent system at large length scales results in the energy cascading down and eventually dissipating at a characteristic small length scale. In conventional fluids, this small scale is set by fluid viscosity. Navon <jats:italic>et al.</jats:italic> studied the turbulence energy cascade in a quantum gas, a Bose-Einstein condensate of rubidium-87 atoms held in a uniform trap. Dissipation occurred by atoms escaping from the trap at a scale that could be tuned by varying the height of the trapping potential. Thanks to the flexibility of their setup, the researchers were able to study both the steady state, in which energy is injected at the same rate it is dissipated, and the transient regime preceding the steady state. </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="6463" page="382" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aau6103">382</jats:related-article> </jats:p>

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>