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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

Cobertura temática

Tabla de contenidos

Comment on “Active sites for CO 2 hydrogenation to methanol on Cu/ZnO catalysts”

Junji NakamuraORCID; Tadahiro FujitaniORCID; Sebastian KuldORCID; Stig Helveg; Ib ChorkendorffORCID; Jens SehestedORCID

<jats:p> Kattel <jats:italic>et al</jats:italic> . (Reports, 24 March 2017, p. 1296) report that a zinc on copper (Zn/Cu) surface undergoes oxidation to zinc oxide/copper (ZnO/Cu) during carbon dioxide (CO <jats:sub>2</jats:sub> ) hydrogenation to methanol and conclude that the Cu-ZnO interface is the active site for methanol synthesis. Similar experiments conducted two decades ago by Fujitani and Nakamura <jats:italic>et al</jats:italic> . demonstrated that Zn is attached to formate rather than being fully oxidized. </jats:p>

Palabras clave: Multidisciplinary.

Pp. No disponible

Island biogeography: Taking the long view of nature’s laboratories

Robert J. WhittakerORCID; José María Fernández-PalaciosORCID; Thomas J. MatthewsORCID; Michael K. BorregaardORCID; Kostas A. TriantisORCID

<jats:title>Dynamics of island biodiversity</jats:title> <jats:p> Fifty years ago, MacArthur and Wilson published their influential book, <jats:italic>The Theory of Island Biogeography</jats:italic> . This work provided a quantitative framework for understanding the ecological processes governing the diversity of species on oceanic islands. Whittaker <jats:italic>et al.</jats:italic> review the subsequent progress in the field, focusing particularly on the integration of the ecological model with island geophysical dynamics. Recent work is showing how immigration, speciation, and extinction respond to the phases of emergence, development, and submergence in oceanic islands. </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="6354" page="eaam8326" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aam8326">eaam8326</jats:related-article> </jats:p>

Palabras clave: Multidisciplinary.

Pp. No disponible

Response to Comment on “Active sites for CO 2 hydrogenation to methanol on Cu/ZnO catalysts”

Shyam KattelORCID; Pedro J. RamírezORCID; Jingguang G. ChenORCID; José A. RodriguezORCID; Ping LiuORCID

<jats:p> In their Comment on the our recent Report, Nakamura <jats:italic>et al</jats:italic> . argue that our x-ray photoelectron spectroscopy (XPS) analysis was affected by the presence of formate species on the catalyst surface. This argument is not valid because the reactant gases were evacuated at temperatures from 525 to 575 kelvin, conditions under which formate is not stable on the catalyst surface. An analysis of the XPS results obtained after exposing zinc oxide/copper (111) [ZnO/Cu(111)] surfaces to hydrogen (H <jats:sub>2</jats:sub> ) and mixtures of carbon dioxide (CO <jats:sub>2</jats:sub> )/H <jats:sub>2</jats:sub> show an absence of carbon (C) 1s signal, no asymmetries in the oxygen (O) 1s peak, and a Zn:O intensity close to 1:1. Thus, the most active phase of these catalysts contained a ZnO-Cu interface. </jats:p>

Palabras clave: Multidisciplinary.

Pp. No disponible

Measuring and managing bias

Jeremy Berg

<jats:p>As someone who grew up with a mother who was a medical researcher, who has been married to a woman very active in scientific research for more than 30 years, and who has had many female colleagues and students, I was surprised when I first took a test to measure implicit gender bias and found that I have a strong automatic association between being male and being involved in science. We all carry a range of biases that are products of our culture and experiences or, in some cases, of outcomes that we desire. Fortunately, many such biases can be measured and, in some cases, effectively managed. A key is to first acknowledge their presence and then to take steps to minimize their influence on important decisions and results.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 849-849

News at a glance

Carolyn Gramling

<jats:p>A roundup of weekly science policy and related news.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 850-852

How an ocean climate cycle favored Harvey

Julia Rosen

<jats:p>Human factors may prolong storm-boosting Atlantic Multidecadal Oscillation phase.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 853-854

Hurricane Harvey provides lab for U.S. forecast experiments

Paul Voosen

<jats:p>New model and satellites test their mettle against the storm.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 854-854

Anti-inflammatory prevents heart attacks

Jennifer Couzin-Frankel

<jats:p>By vindicating theory, antibody result points to new approaches to protecting the heart.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 855-855

Science suffers as China plugs holes in Great Firewall

Dennis Normile

<jats:p>New restrictions hamper access to sites useful for research.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 856-856

India's dark matter quest

Pallava Bagla

<jats:p>Underground physics laboratory opens this week.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 857-857