Catálogo de publicaciones - revistas

<jats:title>Sometimes, red light means grow</jats:title> <jats:p> Some cyanobacteria are able to use the far-red end of the light spectrum by synthesizing chlorophyll f pigments. Introducing the protein responsible for chlorophyll f synthesis into crop plants could potentially expand the range of wavelengths that such plants use during photosynthesis and thereby increase their growth efficiency. Ho <jats:italic>et al.</jats:italic> identified chlorophyll f synthase (ChlF) in two cyanobacteria that are acclimatized to grow using far-red light. Introducing the ChlF-encoding gene into a model cyanobacterium allowed the organism to synthesize chlorophyll f. Similarities between ChlF and a core protein of photosystem II suggest that they have a close evolutionary relationship, and ChlF may even represent a more primitive photochemical reaction center. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/353/6302/886.full">886</jats:ext-link> </jats:p>

<jats:title>From quantum dot to quantum dot</jats:title> <jats:p> A wide range of materials can now be synthesized into semiconducting quantum dots. Because these materials grow from solutions, there is scope to combine quantum dots into devices by using simple, low-cost manufacturing processes. Kagan <jats:italic>et al.</jats:italic> review recent progress in tailoring and combining quantum dots to build electronic and optoelectronic devices. Because it is possible to tune the size, shape, and connectivity of each of the quantum dots, there is potential for fabricating electronic materials with properties that are not available in traditional bulk semiconductors. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/353/6302/885.full">885</jats:ext-link> </jats:p>

<jats:title>A window into the cell for vitamin A</jats:title> <jats:p> Vitamin A is an essential nutrient for mammals, and its metabolites affect diverse biological processes. It is carried in the bloodstream as retinol by retinol binding protein (RBP); a protein called STRA6 is implicated in facilitating retinol translocation across the cell membrane. Chen <jats:italic>et al.</jats:italic> determined the structure of zebrafish STRA6 to a resolution of 3.9 Å by electron microscopy. A lipophilic cleft is a likely binding site for RBP, and an opening in the cleft may allow retinol to diffuse into the membrane. Unexpectedly, the structure also includes bound calcium-modulated protein, but its function remains unclear. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/353/6302/887.full">887</jats:ext-link> </jats:p>

<jats:title>Bonding to berkelium</jats:title> <jats:p> A geographical theme prevailed in the recent naming of the heaviest chemical elements. The choices brought to mind berkelium (Bk) and californium (Cf), the names chosen for elements 97 and 98 over half a century ago. Silver <jats:italic>et al.</jats:italic> now revisit the chemistry of Bk, which has proven fiercely challenging to study over the years on account of its vigorous radioactive decay. Synthetic crystallized Bk borate and dipicolinate compounds structurally resembled Cf analogs in the solid state but manifested distinct electronic and magnetic characteristics stemming from spin-orbit coupling effects. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/353/6302/888.full">888</jats:ext-link> </jats:p>

<jats:p>When the United States Congress returns from an August recess, it must take up appropriations bills, including those that fund science agencies. These bills will only focus on one fiscal year. Yet, almost all scientific projects require years to yield substantial progress. This timeline may favor longer-term budget allocation and other policy adjustments.</jats:p>