Catálogo de publicaciones - revistas
Science
Resumen/Descripción – provisto por la editorial
No disponible.
Palabras clave – provistas por la editorial
No disponibles.
Disponibilidad
Institución detectada | Período | Navegá | Descargá | Solicitá |
---|---|---|---|---|
No detectada | desde mar. 1997 / hasta dic. 2023 | Science Journals |
Información
Tipo de recurso:
revistas
ISSN impreso
0036-8075
ISSN electrónico
1095-9203
Editor responsable
American Association for the Advancement of Science (AAAS)
País de edición
Estados Unidos
Fecha de publicación
1880-
Cobertura temática
Tabla de contenidos
Better bathymetry
Caroline Ash; Jesse Smith (eds.)
Palabras clave: Multidisciplinary.
Pp. 71.7-72
Astrocytes close the mouse critical period for visual plasticity
Jérôme Ribot; Rachel Breton; Charles-Félix Calvo; Julien Moulard; Pascal Ezan; Jonathan Zapata; Kevin Samama; Matthieu Moreau; Alexis-Pierre Bemelmans; Valentin Sabatet; Florent Dingli; Damarys Loew; Chantal Milleret; Pierre Billuart; Glenn Dallérac; Nathalie Rouach
<jats:title>How astrocytes close a critical period</jats:title> <jats:p> During the visual critical period, brain circuits are rewired to adjust to sensory input. Closure of the critical period stabilizes the circuits. Looking at development in the mouse visual cortex, Ribot <jats:italic>et al.</jats:italic> found that astrocytes increase their expression of the gap junction channel subunit connexin 30, which in turn inhibits expression of a matrix-degrading enzyme (see the Perspective by Kofuji and Araque). As the matrix stabilizes, inhibitory interneurons mature, and the unusual flexibility of the critical period comes to an end. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abf5273, this issue p. <jats:related-article issue="6550" page="77" related-article-type="in-this-issue" vol="373">77</jats:related-article> ; see also abj6745, p. <jats:related-article issue="6550" page="29" related-article-type="in-this-issue" vol="373">29</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 77-81
Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states
Marco Valentini; Fernando Peñaranda; Andrea Hofmann; Matthias Brauns; Robert Hauschild; Peter Krogstrup; Pablo San-Jose; Elsa Prada; Ramón Aguado; Georgios Katsaros
<jats:title>A Majorana look-alike</jats:title> <jats:p> Most experimental claims of Majorana bound states, unusual quasiparticles that may become the cornerstone of topological quantum computing, rest on the observation of a persistent zero bias peak (ZBP) in tunneling spectra. In semiconductor–superconductor heterostructures, this feature may also be caused by the topologically trivial Andreev bound states. Valentini <jats:italic>et al.</jats:italic> provide comprehensive evidence that the ZBPs observed in their experiments with semiconductor nanowires fully coated with a superconducting shell are indeed of this topologically trivial origin, in contrast to the interpretation of similar earlier experiments. The researchers identify the length of the tunnel junction in their devices as a crucial experimental parameter. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abf1513, this issue p. <jats:related-article issue="6550" page="82" related-article-type="in-this-issue" vol="373">82</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 82-88
Monolithic optical microlithography of high-density elastic circuits
Yu-Qing Zheng; Yuxin Liu; Donglai Zhong; Shayla Nikzad; Shuhan Liu; Zhiao Yu; Deyu Liu; Hung-Chin Wu; Chenxin Zhu; Jinxing Li; Helen Tran; Jeffrey B.-H. Tok; Zhenan Bao
<jats:title>Direct optical polymer patterning</jats:title> <jats:p> As a platform for electronic devices, polymeric materials offer the advantages of intrinsic flexibility and stretchability relative to hard material devices. However, unlike materials such as silicon, there are few tools for large-scale patterning of monolithic devices. Zheng <jats:italic>et al.</jats:italic> developed an optical lithography technique for the high-throughput fabrication of transistor circuitry on stretchable substrates. In this method, ultraviolet light is used to control the local solubility of the polymer, which makes it possible to fabricate transistors on the micrometer scale. These devices can be made with high yield and excellent uniformity without compromising their electronic and mechanical characteristics. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abh3551, this issue p. <jats:related-article issue="6550" page="88" related-article-type="in-this-issue" vol="373">88</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 88-94
Single-molecule laser nanospectroscopy with micro–electron volt energy resolution
Hiroshi Imada; Miyabi Imai-Imada; Kuniyuki Miwa; Hidemasa Yamane; Takeshi Iwasa; Yusuke Tanaka; Naoyuki Toriumi; Kensuke Kimura; Nobuhiko Yokoshi; Atsuya Muranaka; Masanobu Uchiyama; Tetsuya Taketsugu; Yuichiro K. Kato; Hajime Ishihara; Yousoo Kim
<jats:title>Single-molecule nanospectroscopy</jats:title> <jats:p> Microscopic understanding and molecular-level control of individual electronic quantum states of a single molecule are a long-standing challenge in spectroscopy. Imada <jats:italic>et al.</jats:italic> found that a narrow-line tunable laser combined with a scanning tunneling microscope was able to generate photoluminescence spectra of the electronic and vibrational states of single molecules with micro–electron volt energy resolution and submolecular spatial resolution. The authors also discovered a way to tune the energy levels through a linear Stark effect and plasmon-exciton coupling in the tunneling junction. The proposed technique paves the way to efficient exploitation of energy conversion dynamics in electronic excited states, which constitutes the bedrock principle of such systems as LEDs, photovoltaics, and photosynthetic cells. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abg8790, this issue p. <jats:related-article issue="6550" page="95" related-article-type="in-this-issue" vol="373">95</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 95-98
Laser soliton microcombs heterogeneously integrated on silicon
Chao Xiang; Junqiu Liu; Joel Guo; Lin Chang; Rui Ning Wang; Wenle Weng; Jonathan Peters; Weiqiang Xie; Zeyu Zhang; Johann Riemensberger; Jennifer Selvidge; Tobias J. Kippenberg; John E. Bowers
<jats:title>Chip-based frequency combs</jats:title> <jats:p> The realization of optical frequency combs, light sources with precisely spaced frequencies across a broad spectrum of wavelengths, in dielectric microresonators has affected a range of applications from imaging and ranging to precision time keeping and metrology. Xiang <jats:italic>et al.</jats:italic> demonstrate that the entire system, the laser-pumping system and the comb-generating microresonators, can be combined into an integrated silicon-based platform. Compatibility with foundry fabrication methods will enable this innovation to have a major impact on coherent communications, optical interconnects, and low-noise microwave generation. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abh2076, this issue p. <jats:related-article issue="6550" page="99" related-article-type="in-this-issue" vol="373">99</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 99-103
Synthesis of thermally stable SBT and SBS/SBT intergrowth zeolites
Hwajun Lee; Jiho Shin; Kyounghwan Lee; Hyun June Choi; Alvaro Mayoral; Na Young Kang; Suk Bong Hong
<jats:title>Stabilizing large pores</jats:title> <jats:p> Zeolites with very large cages, such as zeolite Y, are rare but extremely useful in processing the large hydrocarbons in petroleum. Lee <jats:italic>et al.</jats:italic> report a route for preparing thermally stable forms of the large-cage phosphate-based molecular sieves UCSB-6 and UCSB-10 (see the Perspective by Xie). They used mainly sodium and cesium ions as inorganic structure-directing agents, along with an organic molecule, in their charge-density mismatch approach. These zeolites were used as diesel-cracking catalysts at 600°C. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abi7208, this issue p. <jats:related-article issue="6550" page="104" related-article-type="in-this-issue" vol="373">104</jats:related-article> ; see also abj1834, p. <jats:related-article issue="6550" page="28" related-article-type="in-this-issue" vol="373">28</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 104-107
The missing ocean plastic sink: Gone with the rivers
Lisa Weiss; Wolfgang Ludwig; Serge Heussner; Miquel Canals; Jean-François Ghiglione; Claude Estournel; Mel Constant; Philippe Kerhervé
<jats:title>No missing sink</jats:title> <jats:p> Estimates of the flux of microplastics from rivers, in the context of the mass of plastic that has been observed in the ocean, have made it appear that a large, unidentified sink of plastics must exist there. Weiss <jats:italic>et al.</jats:italic> show that there may not be a missing sink after all. By reformulating how mass fluxes are calculated from observations of particle numbers, they demonstrate that those mass fluxes were overestimated by two to three orders of magnitude. This explains why the residence time of plastics in the ocean seemed so puzzlingly short and implies that ocean plastics may persist and degrade over longer periods than previously thought. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abe0290, this issue p. <jats:related-article issue="6550" page="107" related-article-type="in-this-issue" vol="373">107</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 107-111
Embryo-scale, single-cell spatial transcriptomics
Sanjay R. Srivatsan; Mary C. Regier; Eliza Barkan; Jennifer M. Franks; Jonathan S. Packer; Parker Grosjean; Madeleine Duran; Sarah Saxton; Jon J Ladd; Malte Spielmann; Carlos Lois; Paul D. Lampe; Jay Shendure; Kelly R. Stevens; Cole Trapnell
<jats:title>Localizing gene expression</jats:title> <jats:p> Single-cell RNA sequencing can provide information about cellular relationships based on shared transcriptomes, but most methods lose spatial information. Those methods that do retain spatial information can be limited to a specific set of genes and/or a small area. Srivatsan <jats:italic>et al.</jats:italic> introduce sci-Space, a spatial transcriptomic method that uses a grid of barcoded oligos on a slide that can be transferred to nuclei of an overlaid frozen tissue section to obtain both the spatial origin and the transcriptome of thousands of single cells per slide. The researchers used sci-Space to create a spatial atlas of mouse E14 sagittal sections, revealing spatially expressed genes across cell types. This application illustrates how sci-Space complements existing approaches in spatial genomics. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abb9536, this issue p. <jats:related-article issue="6550" page="111" related-article-type="in-this-issue" vol="373">111</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 111-117
Crystal structure of a key enzyme for anaerobic ethane activation
Cedric J. Hahn; Olivier N. Lemaire; Jörg Kahnt; Sylvain Engilberge; Gunter Wegener; Tristan Wagner
<jats:title>How to feed an enzyme ethane</jats:title> <jats:p> When released from ocean floor seeps, small hydrocarbons are rapidly consumed by micro-organisms. Methane is highly abundant and is both produced and consumed by microbes through well understood biochemical pathways. Less well understood is how ethane, also a major natural component of gaseous hydrocarbons, is metabolized. To understand how microbes take advantage of this energy and carbon source, Hahn <jats:italic>et al.</jats:italic> solved the x-ray crystal structures of an enzyme they call ethyl coenzyme-M reductase, which converts ethane into the thioether ethyl-coenzyme M as the entry point for catabolism. They found an expanded active site and, using a xenon gas derivatization experiment, a distinctive tunnel through the protein that is proposed to permit access of the gaseous substrate. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , abg1765, this issue p. <jats:related-article issue="6550" page="118" related-article-type="in-this-issue" vol="373">118</jats:related-article> </jats:p>
Palabras clave: Multidisciplinary.
Pp. 118-121