Catálogo de publicaciones - revistas

<jats:title>Inducing a crossover</jats:title> <jats:p> In conventional superconductors, the electron pairs responsible for superconductivity are large and overlapping. Starting from this so-called Bardeen-Cooper-Schrieffer (BCS) limit, increasing interactions can set the system on a path of crossover to the opposite limit of small, tightly bound electron pairs that undergo Bose-Einstein condensation (BEC). Nakagawa <jats:italic>et al.</jats:italic> intercalated lithium ions into the insulating material zirconium nitride chloride, varying the carrier density across a large range (see the Perspective by Randeria). This induced superconductivity and enabled the system to enter the crossover regime between the BCS and BEC limits. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6538" page="190" related-article-type="in-this-issue" vol="372">190</jats:related-article> ; see also p. <jats:related-article issue="6538" page="132" related-article-type="in-this-issue" vol="372">132</jats:related-article> </jats:p>

<jats:title>Seeding 2D crystals</jats:title> <jats:p> Small, single crystals are often used to direct the growth of larger, bulk single crystals. Xu <jats:italic>et al.</jats:italic> modified these methods to grow single-crystal films of a two-dimensional (2D) semiconductor, 2H molybdenum ditelluride (2H MoTe <jats:sub>2</jats:sub> ), on an amorphous glass surface. After coating the wafer with a 1T′ MoTe <jats:sub>2</jats:sub> film, a small 2H MoTe <jats:sub>2</jats:sub> crystallite was placed on the wafer. The wafer was capped with an alumina film, except for a small hole above the seed region that allowed entry of additional tellurium during the heating process that drove the phase transition and epitaxial growth of 2H MoTe <jats:sub>2</jats:sub> . </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6538" page="195" related-article-type="in-this-issue" vol="372">195</jats:related-article> </jats:p>

<jats:title>Repairing the fish heart</jats:title> <jats:p> Although humans show minimal regenerative capability, zebrafish can regenerate their hearts through a mechanism whereby heart muscle cells (cardiomyocytes) revert to a less mature state and then proliferate to replace the damaged tissue. Ogawa <jats:italic>et al.</jats:italic> show that Krüppel-like factor 1 (Klf1/Eklf), a transcription factor well known for its role in red blood cell development, is an essential factor for heart regeneration in zebrafish. Klf1 is specifically expressed in cardiomyocytes after injury, and its activation is sufficient to stimulate new cardiomyocyte production without injury. This potent effect is achieved through reprogramming of gene networks regulating cardiomyocyte differentiation and mitochondrial metabolism. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6538" page="201" related-article-type="in-this-issue" vol="372">201</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>