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Science
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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
Graphene Nanophotonics
F. Javier García de Abajo
<jats:p>Graphene allows us to control light in innovative ways, providing the prospect of unprecedented nanophotonic devices.</jats:p>
Palabras clave: Multidisciplinary.
Pp. 917-918
Food as a Hormone
Karen K. Ryan; Randy J. Seeley
<jats:p>Nutrient substrates derived from food can activate intracellular signaling cascades to regulate metabolic health.</jats:p>
Palabras clave: Multidisciplinary.
Pp. 918-919
Mars Student Imaging Project: Real Research by Secondary Students
Sheri Klug Boonstra; Philip Christensen
<jats:p>The Mars Student Imaging Project, an IBI prize–winning module, provides student access to NASA scientists and spacecraft data.</jats:p>
Palabras clave: Multidisciplinary.
Pp. 920-921
AAAS News and Notes
<jats:p> A monthly roundup of recent news and projects of <jats:italic>Science</jats:italic> 's publisher, the American Association for the Advancement of Science. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 922-922
How Cells Know Where They Are
Arthur D. Lander
<jats:p>Development, regeneration, and even day-to-day physiology require plant and animal cells to make decisions based on their locations. The principles by which cells may do this are deceptively straightforward. But when reliability needs to be high—as often occurs during development—successful strategies tend to be anything but simple. Increasingly, the challenge facing biologists is to relate the diverse diffusible molecules, control circuits, and gene regulatory networks that help cells know where they are to the varied, sometimes stringent, constraints imposed by the need for real-world precision and accuracy.</jats:p>
Palabras clave: Multidisciplinary.
Pp. 923-927
Using the Earth as a Polarized Electron Source to Search for Long-Range Spin-Spin Interactions
Larry Hunter; Joel Gordon; Stephen Peck; Daniel Ang; Jung-Fu Lin
<jats:title>In Search of Unparticles</jats:title> <jats:p> The standard model of particle physics, which describes the basic building blocks of the universe and the interactions among them, is incomplete. Numerous theoretical extensions have been proposed, some of which predict long-range, spin-spin interactions. To test whether such interactions exist, a laboratory spin source is normally used. <jats:bold> Hunter <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="928" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1227460">928</jats:related-article> ) used Earth as a polarized spin source and looked for these interactions by changing the geographical position and the orientation of the measurement apparatus. The polarized spins mainly come from the electrons in iron-containing minerals of Earth's mantle, which align in Earth's magnetic field. The large numbers of such polarized electrons allowed the extraction of upper bounds on some of the exotic spin-spin interactions far lower than those obtained in the laboratory. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 928-932
Ferromagnetic Quantum Critical Point in the Heavy-Fermion Metal YbNi 4 (P 1− x As x
Alexander Steppke; Robert Küchler; Stefan Lausberg; Edit Lengyel; Lucia Steinke; Robert Borth; Thomas Lühmann; Cornelius Krellner; Michael Nicklas; Christoph Geibel; Frank Steglich; Manuel Brando
<jats:title>Arsenic Makes a Difference</jats:title> <jats:p> A quantum critical point (QCP) occurs when quantum fluctuations, which do not go away even at absolute zero, cause a gradual (so-called second order) phase change. QCPs have been observed in ferromagnets, but for ferromagnetic metals, the evidence is less clear-cut and it is thought that, as the temperature is lowered, another order—such as superconductivity—will prevent the formation of a QCP. However, <jats:bold> Steppke <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="933" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1230583">933</jats:related-article> ), using specific heat and magnetic susceptibility measurements, found strong evidence for a QCP in a quasi–one-dimensional heavy fermion material, YbNi <jats:sub>4</jats:sub> (P <jats:sub> 1− <jats:italic>x</jats:italic> </jats:sub> As <jats:sub> <jats:italic>x</jats:italic> </jats:sub> ) <jats:sub>2</jats:sub> , near an Arsenic substitution level of about 10%. The results present a challenge to theories about quantum criticality in ferromagnets. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 933-936
Living Crystals of Light-Activated Colloidal Surfers
Jeremie Palacci; Stefano Sacanna; Asher Preska Steinberg; David J. Pine; Paul M. Chaikin
<jats:title>Light On Clusters</jats:title> <jats:p> From schools of fish to bacterial colonies, large-scale phenomena—such as swarming or pattern formation—are ubiquitous. In such systems, there is a continuing question as to the relative importance of "intelligence" (biology) of the agents versus purely physical effects. Working with synthetic colloids, <jats:bold> Palacci <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="936" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1230020">936</jats:related-article> ) show that self-organized clustering can be switched on and off to form crystals that dissolve when the light source is turned off. The particles consist of a hematite cube partly encapsulated in a polymeric sphere that is able to catalyze chemical reactions when exposed to light. The self-assembly behavior results from a combination of propelling forces, osmotic effects, and coupling between colloidal and tracer particles. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 936-940
Global Patterns of Groundwater Table Depth
Y. Fan; H. Li; G. Miguez-Macho
<jats:title>Water Flowing Underground</jats:title> <jats:p> In addition to serving as an out-of-sight, yet much-needed water source, groundwater influences ecosystems on land—especially when the groundwater depth is shallow. <jats:bold> Fan <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="940" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1229881">940</jats:related-article> ) used government archives and published studies to construct a global map of groundwater depth based on over 1,000,000 direct well measurements. A groundwater model was then used to construct a continuous global map of groundwater depth. The findings reveal the global influence of sea level and climate on groundwater depths across several regions and ecosystems. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 940-943
Direct Observations of Atmospheric Aerosol Nucleation
Markku Kulmala; Jenni Kontkanen; Heikki Junninen; Katrianne Lehtipalo; Hanna E. Manninen; Tuomo Nieminen; Tuukka Petäjä; Mikko Sipilä; Siegfried Schobesberger; Pekka Rantala; Alessandro Franchin; Tuija Jokinen; Emma Järvinen; Mikko Äijälä; Juha Kangasluoma; Jani Hakala; Pasi P. Aalto; Pauli Paasonen; Jyri Mikkilä; Joonas Vanhanen; Juho Aalto; Hannele Hakola; Ulla Makkonen; Taina Ruuskanen; Roy L. Mauldin; Jonathan Duplissy; Hanna Vehkamäki; Jaana Bäck; Aki Kortelainen; Ilona Riipinen; Theo Kurtén; Murray V. Johnston; James N. Smith; Mikael Ehn; Thomas F. Mentel; Kari E. J. Lehtinen; Ari Laaksonen; Veli-Matti Kerminen; Douglas R. Worsnop
<jats:title>Aerosol Formation</jats:title> <jats:p> Most atmospheric aerosol particles result from a growth process that begins with atmospheric molecules and clusters, progressing to larger and larger sizes as they acquire other molecules, clusters, and particles. The initial steps of this process involve very small entities—with diameters of less than 2 nanometers—which have been difficult to observe. <jats:bold> Kulmala <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="943" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1227385">943</jats:related-article> ; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6122" page="911" related-article-type="in-this-issue" vol="339" xlink:href="10.1126/science.1233798">Andreae</jats:related-article> </jats:bold> ) developed a sensitive observational protocol that allows these tiny seeds to be detected and counted, and they mapped out the process of aerosol formation in detail. </jats:p>
Palabras clave: Multidisciplinary.
Pp. 943-946